Pileus Git - ~andy/gtk/blob - gtk/gtktextview.c

   1 /* GTK - The GIMP Toolkit
   2  * gtktextview.c Copyright (C) 2000 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include <string.h>
  28
  29 #include "gtkbindings.h"
  30 #include "gtkdnd.h"
  31 #include "gtkintl.h"
  32 #include "gtkmain.h"
  33 #include "gtkmenu.h"
  34 #include "gtkmenuitem.h"
  35 #include "gtkseparatormenuitem.h"
  36 #include "gtksignal.h"
  37 #include "gtktextdisplay.h"
  38 #include "gtktextview.h"
  39 #include "gtkimmulticontext.h"
  40 #include "gdk/gdkkeysyms.h"
  41 #include <string.h>
  42
  43 /* How scrolling, validation, exposes, etc. work.
  44  *
  45  * The expose_event handler has the invariant that the onscreen lines
  46  * have been validated.
  47  *
  48  * There are two ways that onscreen lines can become invalid. The first
  49  * is to change which lines are onscreen. This happens when the value
  50  * of a scroll adjustment changes. So the code path begins in
  51  * gtk_text_view_value_changed() and goes like this:
  52  *   - gdk_window_scroll() to reflect the new adjustment value
  53  *   - validate the lines that were moved onscreen
  54  *   - gdk_window_process_updates() to handle the exposes immediately
  55  *
  56  * The second way is that you get the "invalidated" signal from the layout,
  57  * indicating that lines have become invalid. This code path begins in
  58  * invalidated_handler() and goes like this:
  59  *   - install high-priority idle which does the rest of the steps
  60  *   - if a scroll is pending from scroll_to_mark(), do the scroll,
  61  *     jumping to the gtk_text_view_value_changed() code path
  62  *   - otherwise, validate the onscreen lines
  63  *   - DO NOT process updates
  64  *
  65  * In both cases, validating the onscreen lines can trigger a scroll
  66  * due to maintaining the first_para on the top of the screen.
  67  * If validation triggers a scroll, we jump to the top of the code path
  68  * for value_changed, and bail out of the current code path.
  69  *
  70  * Also, in size_allocate, if we invalidate some lines from changing
  71  * the layout width, we need to go ahead and run the high-priority idle,
  72  * because GTK sends exposes right after doing the size allocates without
  73  * returning to the main loop. This is also why the high-priority idle
  74  * is at a higher priority than resizing.
  75  *
  76  */
  77
  78 #define FOCUS_EDGE_WIDTH 1
  79
  80 #define SCREEN_WIDTH(widget) text_window_get_width (GTK_TEXT_VIEW (widget)->text_window)
  81 #define SCREEN_HEIGHT(widget) text_window_get_height (GTK_TEXT_VIEW (widget)->text_window)
  82
  83 /* #define DEBUG_VALIDATION_AND_SCROLLING */
  84
  85 #ifdef DEBUG_VALIDATION_AND_SCROLLING
  86 #define DV(x) (x)
  87 #else
  88 #define DV(x)
  89 #endif
  90
  91 struct _GtkTextPendingScroll
  92 {
  93   GtkTextMark   *mark;
  94   gdouble        within_margin;
  95   gboolean       use_align;
  96   gdouble        xalign;
  97   gdouble        yalign;
  98 };
  99
 100 enum
 101 {
 102   SET_SCROLL_ADJUSTMENTS,
 103   POPULATE_POPUP,
 104   MOVE_CURSOR,
 105   SET_ANCHOR,
 106   INSERT_AT_CURSOR,
 107   DELETE_FROM_CURSOR,
 108   CUT_CLIPBOARD,
 109   COPY_CLIPBOARD,
 110   PASTE_CLIPBOARD,
 111   TOGGLE_OVERWRITE,
 112   LAST_SIGNAL
 113 };
 114
 115 enum
 116 {
 117   ARG_0,
 118   ARG_HEIGHT_LINES,
 119   ARG_WIDTH_COLUMNS,
 120   ARG_PIXELS_ABOVE_LINES,
 121   ARG_PIXELS_BELOW_LINES,
 122   ARG_PIXELS_INSIDE_WRAP,
 123   ARG_EDITABLE,
 124   ARG_WRAP_MODE,
 125   ARG_JUSTIFY,
 126   ARG_LEFT_MARGIN,
 127   ARG_RIGHT_MARGIN,
 128   ARG_INDENT,
 129   ARG_TABS,
 130   LAST_ARG
 131 };
 132
 133 static void gtk_text_view_init                 (GtkTextView      *text_view);
 134 static void gtk_text_view_class_init           (GtkTextViewClass *klass);
 135 static void gtk_text_view_destroy              (GtkObject        *object);
 136 static void gtk_text_view_finalize             (GObject          *object);
 137 static void gtk_text_view_set_arg              (GtkObject        *object,
 138                                                 GtkArg           *arg,
 139                                                 guint             arg_id);
 140 static void gtk_text_view_get_arg              (GtkObject        *object,
 141                                                 GtkArg           *arg,
 142                                                 guint             arg_id);
 143 static void gtk_text_view_size_request         (GtkWidget        *widget,
 144                                                 GtkRequisition   *requisition);
 145 static void gtk_text_view_size_allocate        (GtkWidget        *widget,
 146                                                 GtkAllocation    *allocation);
 147 static void gtk_text_view_realize              (GtkWidget        *widget);
 148 static void gtk_text_view_unrealize            (GtkWidget        *widget);
 149 static void gtk_text_view_style_set            (GtkWidget        *widget,
 150                                                 GtkStyle         *previous_style);
 151 static void gtk_text_view_direction_changed    (GtkWidget        *widget,
 152                                                 GtkTextDirection  previous_direction);
 153 static gint gtk_text_view_event                (GtkWidget        *widget,
 154                                                 GdkEvent         *event);
 155 static gint gtk_text_view_key_press_event      (GtkWidget        *widget,
 156                                                 GdkEventKey      *event);
 157 static gint gtk_text_view_key_release_event    (GtkWidget        *widget,
 158                                                 GdkEventKey      *event);
 159 static gint gtk_text_view_button_press_event   (GtkWidget        *widget,
 160                                                 GdkEventButton   *event);
 161 static gint gtk_text_view_button_release_event (GtkWidget        *widget,
 162                                                 GdkEventButton   *event);
 163 static gint gtk_text_view_focus_in_event       (GtkWidget        *widget,
 164                                                 GdkEventFocus    *event);
 165 static gint gtk_text_view_focus_out_event      (GtkWidget        *widget,
 166                                                 GdkEventFocus    *event);
 167 static gint gtk_text_view_motion_event         (GtkWidget        *widget,
 168                                                 GdkEventMotion   *event);
 169 static gint gtk_text_view_expose_event         (GtkWidget        *widget,
 170                                                 GdkEventExpose   *expose);
 171 static void gtk_text_view_draw_focus           (GtkWidget        *widget);
 172
 173 /* Source side drag signals */
 174 static void gtk_text_view_drag_begin       (GtkWidget        *widget,
 175                                             GdkDragContext   *context);
 176 static void gtk_text_view_drag_end         (GtkWidget        *widget,
 177                                             GdkDragContext   *context);
 178 static void gtk_text_view_drag_data_get    (GtkWidget        *widget,
 179                                             GdkDragContext   *context,
 180                                             GtkSelectionData *selection_data,
 181                                             guint             info,
 182                                             guint             time);
 183 static void gtk_text_view_drag_data_delete (GtkWidget        *widget,
 184                                             GdkDragContext   *context);
 185
 186 /* Target side drag signals */
 187 static void     gtk_text_view_drag_leave         (GtkWidget        *widget,
 188                                                   GdkDragContext   *context,
 189                                                   guint             time);
 190 static gboolean gtk_text_view_drag_motion        (GtkWidget        *widget,
 191                                                   GdkDragContext   *context,
 192                                                   gint              x,
 193                                                   gint              y,
 194                                                   guint             time);
 195 static gboolean gtk_text_view_drag_drop          (GtkWidget        *widget,
 196                                                   GdkDragContext   *context,
 197                                                   gint              x,
 198                                                   gint              y,
 199                                                   guint             time);
 200 static void     gtk_text_view_drag_data_received (GtkWidget        *widget,
 201                                                   GdkDragContext   *context,
 202                                                   gint              x,
 203                                                   gint              y,
 204                                                   GtkSelectionData *selection_data,
 205                                                   guint             info,
 206                                                   guint             time);
 207
 208 static void gtk_text_view_set_scroll_adjustments (GtkTextView   *text_view,
 209                                                   GtkAdjustment *hadj,
 210                                                   GtkAdjustment *vadj);
 211 static void gtk_text_view_popup_menu             (GtkWidget     *widget);
 212
 213 static void gtk_text_view_move_cursor      (GtkTextView           *text_view,
 214                                             GtkMovementStep        step,
 215                                             gint                   count,
 216                                             gboolean               extend_selection);
 217 static void gtk_text_view_set_anchor       (GtkTextView           *text_view);
 218 static void gtk_text_view_scroll_pages     (GtkTextView           *text_view,
 219                                             gint                   count);
 220 static void gtk_text_view_insert_at_cursor (GtkTextView           *text_view,
 221                                             const gchar           *str);
 222 static void gtk_text_view_delete_from_cursor (GtkTextView           *text_view,
 223                                               GtkDeleteType          type,
 224                                               gint                   count);
 225 static void gtk_text_view_cut_clipboard    (GtkTextView           *text_view);
 226 static void gtk_text_view_copy_clipboard   (GtkTextView           *text_view);
 227 static void gtk_text_view_paste_clipboard  (GtkTextView           *text_view);
 228 static void gtk_text_view_toggle_overwrite (GtkTextView           *text_view);
 229 static void gtk_text_view_unselect         (GtkTextView           *text_view);
 230
 231 static void     gtk_text_view_validate_onscreen     (GtkTextView        *text_view);
 232 static void     gtk_text_view_get_first_para_iter   (GtkTextView        *text_view,
 233                                                      GtkTextIter        *iter);
 234 static void     gtk_text_view_update_layout_width       (GtkTextView        *text_view);
 235 static void     gtk_text_view_set_attributes_from_style (GtkTextView        *text_view,
 236                                                          GtkTextAttributes *values,
 237                                                          GtkStyle           *style);
 238 static void     gtk_text_view_ensure_layout         (GtkTextView        *text_view);
 239 static void     gtk_text_view_destroy_layout        (GtkTextView        *text_view);
 240 static void     gtk_text_view_reset_im_context      (GtkTextView        *text_view);
 241 static void     gtk_text_view_start_selection_drag  (GtkTextView        *text_view,
 242                                                      const GtkTextIter  *iter,
 243                                                      GdkEventButton     *event);
 244 static gboolean gtk_text_view_end_selection_drag    (GtkTextView        *text_view,
 245                                                      GdkEventButton     *event);
 246 static void     gtk_text_view_start_selection_dnd   (GtkTextView        *text_view,
 247                                                      const GtkTextIter  *iter,
 248                                                      GdkEventMotion     *event);
 249 static void     gtk_text_view_start_cursor_blink    (GtkTextView        *text_view,
 250                                                      gboolean            with_delay);
 251 static void     gtk_text_view_stop_cursor_blink     (GtkTextView        *text_view);
 252
 253 static void gtk_text_view_value_changed           (GtkAdjustment *adj,
 254                                                    GtkTextView   *view);
 255 static void gtk_text_view_commit_handler          (GtkIMContext  *context,
 256                                                    const gchar   *str,
 257                                                    GtkTextView   *text_view);
 258 static void gtk_text_view_preedit_changed_handler (GtkIMContext  *context,
 259                                                    GtkTextView   *text_view);
 260
 261 static void gtk_text_view_mark_set_handler       (GtkTextBuffer     *buffer,
 262                                                   const GtkTextIter *location,
 263                                                   GtkTextMark       *mark,
 264                                                   gpointer           data);
 265 static void gtk_text_view_get_virtual_cursor_pos (GtkTextView       *text_view,
 266                                                   gint              *x,
 267                                                   gint              *y);
 268 static void gtk_text_view_set_virtual_cursor_pos (GtkTextView       *text_view,
 269                                                   gint               x,
 270                                                   gint               y);
 271
 272 static GtkAdjustment* get_hadjustment            (GtkTextView       *text_view);
 273 static GtkAdjustment* get_vadjustment            (GtkTextView       *text_view);
 274
 275 static void gtk_text_view_do_popup               (GtkTextView       *text_view,
 276                                                   GdkEventButton    *event);
 277
 278 static void gtk_text_view_queue_scroll           (GtkTextView   *text_view,
 279                                                   GtkTextMark   *mark,
 280                                                   gdouble        within_margin,
 281                                                   gboolean       use_align,
 282                                                   gdouble        xalign,
 283                                                   gdouble        yalign);
 284
 285 static gboolean gtk_text_view_flush_scroll       (GtkTextView *text_view);
 286
 287 /* Container methods */
 288 static void gtk_text_view_add    (GtkContainer *container,
 289                                   GtkWidget    *child);
 290 static void gtk_text_view_remove (GtkContainer *container,
 291                                   GtkWidget    *child);
 292 static void gtk_text_view_forall (GtkContainer *container,
 293                                   gboolean      include_internals,
 294                                   GtkCallback   callback,
 295                                   gpointer      callback_data);
 296
 297 /* FIXME probably need the focus methods. */
 298
 299 /* Hack-around */
 300 #define g_signal_handlers_disconnect_by_func(obj, func, data) g_signal_handlers_disconnect_matched (obj, G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA, 0, 0, NULL, func, data)
 301
 302 typedef struct _GtkTextViewChild GtkTextViewChild;
 303
 304 struct _GtkTextViewChild
 305 {
 306   GtkWidget *widget;
 307
 308   GtkTextChildAnchor *anchor;
 309
 310   gint from_top_of_line;
 311   gint from_left_of_buffer;
 312
 313   /* These are ignored if anchor != NULL */
 314   GtkTextWindowType type;
 315   gint x;
 316   gint y;
 317 };
 318
 319 static GtkTextViewChild* text_view_child_new_anchored (GtkWidget          *child,
 320                                                        GtkTextChildAnchor *anchor,
 321                                                        GtkTextLayout      *layout);
 322 static GtkTextViewChild* text_view_child_new_window   (GtkWidget          *child,
 323                                                        GtkTextWindowType   type,
 324                                                        gint                x,
 325                                                        gint                y);
 326 static void              text_view_child_free         (GtkTextViewChild   *child);
 327
 328 static void              text_view_child_realize      (GtkTextView      *text_view,
 329                                                        GtkTextViewChild *child);
 330
 331 struct _GtkTextWindow
 332 {
 333   GtkTextWindowType type;
 334   GtkWidget *widget;
 335   GdkWindow *window;
 336   GdkWindow *bin_window;
 337   GtkRequisition requisition;
 338   GdkRectangle allocation;
 339 };
 340
 341 static GtkTextWindow *text_window_new             (GtkTextWindowType  type,
 342                                                    GtkWidget         *widget,
 343                                                    gint               width_request,
 344                                                    gint               height_request);
 345 static void           text_window_free            (GtkTextWindow     *win);
 346 static void           text_window_realize         (GtkTextWindow     *win,
 347                                                    GdkWindow         *parent);
 348 static void           text_window_unrealize       (GtkTextWindow     *win);
 349 static void           text_window_size_allocate   (GtkTextWindow     *win,
 350                                                    GdkRectangle      *rect);
 351 static void           text_window_scroll          (GtkTextWindow     *win,
 352                                                    gint               dx,
 353                                                    gint               dy);
 354 static void           text_window_invalidate_rect (GtkTextWindow     *win,
 355                                                    GdkRectangle      *rect);
 356
 357 static gint           text_window_get_width       (GtkTextWindow     *win);
 358 static gint           text_window_get_height      (GtkTextWindow     *win);
 359 static void           text_window_get_allocation  (GtkTextWindow     *win,
 360                                                    GdkRectangle      *rect);
 361
 362
 363 enum
 364 {
 365   TARGET_STRING,
 366   TARGET_TEXT,
 367   TARGET_COMPOUND_TEXT,
 368   TARGET_UTF8_STRING,
 369   TARGET_TEXT_BUFFER_CONTENTS
 370 };
 371
 372 static GtkTargetEntry target_table[] = {
 373   { "GTK_TEXT_BUFFER_CONTENTS", GTK_TARGET_SAME_APP,
 374     TARGET_TEXT_BUFFER_CONTENTS },
 375   { "UTF8_STRING", 0, TARGET_UTF8_STRING },
 376   { "COMPOUND_TEXT", 0, TARGET_COMPOUND_TEXT },
 377   { "TEXT", 0, TARGET_TEXT },
 378   { "text/plain", 0, TARGET_STRING },
 379   { "STRING",     0, TARGET_STRING }
 380 };
 381
 382 static GtkContainerClass *parent_class = NULL;
 383 static guint signals[LAST_SIGNAL] = { 0 };
 384
 385 GtkType
 386 gtk_text_view_get_type (void)
 387 {
 388   static GtkType our_type = 0;
 389
 390   if (our_type == 0)
 391     {
 392       static const GtkTypeInfo our_info =
 393       {
 394         "GtkTextView",
 395         sizeof (GtkTextView),
 396         sizeof (GtkTextViewClass),
 397         (GtkClassInitFunc) gtk_text_view_class_init,
 398         (GtkObjectInitFunc) gtk_text_view_init,
 399         /* reserved_1 */ NULL,
 400         /* reserved_2 */ NULL,
 401         (GtkClassInitFunc) NULL
 402       };
 403
 404       our_type = gtk_type_unique (GTK_TYPE_CONTAINER, &our_info);
 405     }
 406
 407   return our_type;
 408 }
 409
 410 static void
 411 add_move_binding (GtkBindingSet  *binding_set,
 412                   guint           keyval,
 413                   guint           modmask,
 414                   GtkMovementStep step,
 415                   gint            count)
 416 {
 417   g_return_if_fail ((modmask & GDK_SHIFT_MASK) == 0);
 418
 419   gtk_binding_entry_add_signal (binding_set, keyval, modmask,
 420                                 "move_cursor", 3,
 421                                 GTK_TYPE_ENUM, step,
 422                                 GTK_TYPE_INT, count,
 423                                 GTK_TYPE_BOOL, FALSE);
 424
 425   /* Selection-extending version */
 426   gtk_binding_entry_add_signal (binding_set, keyval, modmask | GDK_SHIFT_MASK,
 427                                 "move_cursor", 3,
 428                                 GTK_TYPE_ENUM, step,
 429                                 GTK_TYPE_INT, count,
 430                                 GTK_TYPE_BOOL, TRUE);
 431 }
 432
 433 static void
 434 gtk_text_view_class_init (GtkTextViewClass *klass)
 435 {
 436   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 437   GtkObjectClass *object_class = GTK_OBJECT_CLASS (klass);
 438   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 439   GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
 440   GtkBindingSet *binding_set;
 441
 442   parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
 443
 444   /* Default handlers and virtual methods
 445    */
 446   object_class->set_arg = gtk_text_view_set_arg;
 447   object_class->get_arg = gtk_text_view_get_arg;
 448
 449   object_class->destroy = gtk_text_view_destroy;
 450   gobject_class->finalize = gtk_text_view_finalize;
 451
 452   widget_class->realize = gtk_text_view_realize;
 453   widget_class->unrealize = gtk_text_view_unrealize;
 454   widget_class->style_set = gtk_text_view_style_set;
 455   widget_class->direction_changed = gtk_text_view_direction_changed;
 456   widget_class->size_request = gtk_text_view_size_request;
 457   widget_class->size_allocate = gtk_text_view_size_allocate;
 458   widget_class->event = gtk_text_view_event;
 459   widget_class->key_press_event = gtk_text_view_key_press_event;
 460   widget_class->key_release_event = gtk_text_view_key_release_event;
 461   widget_class->button_press_event = gtk_text_view_button_press_event;
 462   widget_class->button_release_event = gtk_text_view_button_release_event;
 463   widget_class->focus_in_event = gtk_text_view_focus_in_event;
 464   widget_class->focus_out_event = gtk_text_view_focus_out_event;
 465   widget_class->motion_notify_event = gtk_text_view_motion_event;
 466   widget_class->expose_event = gtk_text_view_expose_event;
 467
 468   widget_class->drag_begin = gtk_text_view_drag_begin;
 469   widget_class->drag_end = gtk_text_view_drag_end;
 470   widget_class->drag_data_get = gtk_text_view_drag_data_get;
 471   widget_class->drag_data_delete = gtk_text_view_drag_data_delete;
 472
 473   widget_class->drag_leave = gtk_text_view_drag_leave;
 474   widget_class->drag_motion = gtk_text_view_drag_motion;
 475   widget_class->drag_drop = gtk_text_view_drag_drop;
 476   widget_class->drag_data_received = gtk_text_view_drag_data_received;
 477
 478   widget_class->popup_menu = gtk_text_view_popup_menu;
 479
 480   container_class->add = gtk_text_view_add;
 481   container_class->remove = gtk_text_view_remove;
 482   container_class->forall = gtk_text_view_forall;
 483
 484   klass->move_cursor = gtk_text_view_move_cursor;
 485   klass->set_anchor = gtk_text_view_set_anchor;
 486   klass->insert_at_cursor = gtk_text_view_insert_at_cursor;
 487   klass->delete_from_cursor = gtk_text_view_delete_from_cursor;
 488   klass->cut_clipboard = gtk_text_view_cut_clipboard;
 489   klass->copy_clipboard = gtk_text_view_copy_clipboard;
 490   klass->paste_clipboard = gtk_text_view_paste_clipboard;
 491   klass->toggle_overwrite = gtk_text_view_toggle_overwrite;
 492   klass->set_scroll_adjustments = gtk_text_view_set_scroll_adjustments;
 493
 494   /*
 495    * Arguments
 496    */
 497   gtk_object_add_arg_type ("GtkTextView::height_lines", GTK_TYPE_INT,
 498                            GTK_ARG_READWRITE, ARG_HEIGHT_LINES);
 499   gtk_object_add_arg_type ("GtkTextView::width_columns", GTK_TYPE_INT,
 500                            GTK_ARG_READWRITE, ARG_WIDTH_COLUMNS);
 501   gtk_object_add_arg_type ("GtkTextView::pixels_above_lines", GTK_TYPE_INT,
 502                            GTK_ARG_READWRITE, ARG_PIXELS_ABOVE_LINES);
 503   gtk_object_add_arg_type ("GtkTextView::pixels_below_lines", GTK_TYPE_INT,
 504                            GTK_ARG_READWRITE, ARG_PIXELS_BELOW_LINES);
 505   gtk_object_add_arg_type ("GtkTextView::pixels_inside_wrap", GTK_TYPE_INT,
 506                            GTK_ARG_READWRITE, ARG_PIXELS_INSIDE_WRAP);
 507   gtk_object_add_arg_type ("GtkTextView::editable", GTK_TYPE_BOOL,
 508                            GTK_ARG_READWRITE, ARG_EDITABLE);
 509   gtk_object_add_arg_type ("GtkTextView::wrap_mode", GTK_TYPE_ENUM,
 510                            GTK_ARG_READWRITE, ARG_WRAP_MODE);
 511   gtk_object_add_arg_type ("GtkTextView::justify", GTK_TYPE_ENUM,
 512                            GTK_ARG_READWRITE, ARG_JUSTIFY);
 513   gtk_object_add_arg_type ("GtkTextView::left_margin", GTK_TYPE_INT,
 514                            GTK_ARG_READWRITE, ARG_LEFT_MARGIN);
 515   gtk_object_add_arg_type ("GtkTextView::right_margin", GTK_TYPE_INT,
 516                            GTK_ARG_READWRITE, ARG_RIGHT_MARGIN);
 517   gtk_object_add_arg_type ("GtkTextView::indent", GTK_TYPE_INT,
 518                            GTK_ARG_READWRITE, ARG_INDENT);
 519   gtk_object_add_arg_type ("GtkTextView::tabs", GTK_TYPE_POINTER, /* FIXME */
 520                            GTK_ARG_READWRITE, ARG_TABS);
 521
 522   /*
 523    * Signals
 524    */
 525
 526   signals[MOVE_CURSOR] =
 527     gtk_signal_new ("move_cursor",
 528                     GTK_RUN_LAST | GTK_RUN_ACTION,
 529                     GTK_CLASS_TYPE (object_class),
 530                     GTK_SIGNAL_OFFSET (GtkTextViewClass, move_cursor),
 531                     gtk_marshal_VOID__ENUM_INT_BOOLEAN,
 532                     GTK_TYPE_NONE, 3, GTK_TYPE_MOVEMENT_STEP, GTK_TYPE_INT, GTK_TYPE_BOOL);
 533
 534   signals[SET_ANCHOR] =
 535     gtk_signal_new ("set_anchor",
 536                     GTK_RUN_LAST | GTK_RUN_ACTION,
 537                     GTK_CLASS_TYPE (object_class),
 538                     GTK_SIGNAL_OFFSET (GtkTextViewClass, set_anchor),
 539                     gtk_marshal_VOID__VOID,
 540                     GTK_TYPE_NONE, 0);
 541
 542   signals[INSERT_AT_CURSOR] =
 543     gtk_signal_new ("insert_at_cursor",
 544                     GTK_RUN_LAST | GTK_RUN_ACTION,
 545                     GTK_CLASS_TYPE (object_class),
 546                     GTK_SIGNAL_OFFSET (GtkTextViewClass, insert_at_cursor),
 547                     gtk_marshal_VOID__STRING,
 548                     GTK_TYPE_NONE, 1, GTK_TYPE_STRING);
 549
 550   signals[DELETE_FROM_CURSOR] =
 551     gtk_signal_new ("delete_from_cursor",
 552                     GTK_RUN_LAST | GTK_RUN_ACTION,
 553                     GTK_CLASS_TYPE (object_class),
 554                     GTK_SIGNAL_OFFSET (GtkTextViewClass, delete_from_cursor),
 555                     gtk_marshal_VOID__ENUM_INT,
 556                     GTK_TYPE_NONE, 2, GTK_TYPE_DELETE_TYPE, GTK_TYPE_INT);
 557
 558   signals[CUT_CLIPBOARD] =
 559     gtk_signal_new ("cut_clipboard",
 560                     GTK_RUN_LAST | GTK_RUN_ACTION,
 561                     GTK_CLASS_TYPE (object_class),
 562                     GTK_SIGNAL_OFFSET (GtkTextViewClass, cut_clipboard),
 563                     gtk_marshal_VOID__VOID,
 564                     GTK_TYPE_NONE, 0);
 565
 566   signals[COPY_CLIPBOARD] =
 567     gtk_signal_new ("copy_clipboard",
 568                     GTK_RUN_LAST | GTK_RUN_ACTION,
 569                     GTK_CLASS_TYPE (object_class),
 570                     GTK_SIGNAL_OFFSET (GtkTextViewClass, copy_clipboard),
 571                     gtk_marshal_VOID__VOID,
 572                     GTK_TYPE_NONE, 0);
 573
 574   signals[PASTE_CLIPBOARD] =
 575     gtk_signal_new ("paste_clipboard",
 576                     GTK_RUN_LAST | GTK_RUN_ACTION,
 577                     GTK_CLASS_TYPE (object_class),
 578                     GTK_SIGNAL_OFFSET (GtkTextViewClass, paste_clipboard),
 579                     gtk_marshal_VOID__VOID,
 580                     GTK_TYPE_NONE, 0);
 581
 582   signals[TOGGLE_OVERWRITE] =
 583     gtk_signal_new ("toggle_overwrite",
 584                     GTK_RUN_LAST | GTK_RUN_ACTION,
 585                     GTK_CLASS_TYPE (object_class),
 586                     GTK_SIGNAL_OFFSET (GtkTextViewClass, toggle_overwrite),
 587                     gtk_marshal_VOID__VOID,
 588                     GTK_TYPE_NONE, 0);
 589
 590   signals[SET_SCROLL_ADJUSTMENTS] =
 591     gtk_signal_new ("set_scroll_adjustments",
 592                     GTK_RUN_LAST,
 593                     GTK_CLASS_TYPE (object_class),
 594                     GTK_SIGNAL_OFFSET (GtkTextViewClass, set_scroll_adjustments),
 595                     gtk_marshal_VOID__OBJECT_OBJECT,
 596                     GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
 597   widget_class->set_scroll_adjustments_signal = signals[SET_SCROLL_ADJUSTMENTS];
 598
 599   signals[POPULATE_POPUP] =
 600     gtk_signal_new ("populate_popup",
 601                     GTK_RUN_LAST,
 602                     GTK_CLASS_TYPE (object_class),
 603                     GTK_SIGNAL_OFFSET (GtkTextViewClass, populate_popup),
 604                     gtk_marshal_VOID__OBJECT,
 605                     GTK_TYPE_NONE, 1, GTK_TYPE_MENU);
 606
 607   /*
 608    * Key bindings
 609    */
 610
 611   binding_set = gtk_binding_set_by_class (klass);
 612
 613   /* Moving the insertion point */
 614   add_move_binding (binding_set, GDK_Right, 0,
 615                     GTK_MOVEMENT_VISUAL_POSITIONS, 1);
 616
 617   add_move_binding (binding_set, GDK_Left, 0,
 618                     GTK_MOVEMENT_VISUAL_POSITIONS, -1);
 619
 620   add_move_binding (binding_set, GDK_f, GDK_CONTROL_MASK,
 621                     GTK_MOVEMENT_LOGICAL_POSITIONS, 1);
 622
 623   add_move_binding (binding_set, GDK_b, GDK_CONTROL_MASK,
 624                     GTK_MOVEMENT_LOGICAL_POSITIONS, -1);
 625
 626   add_move_binding (binding_set, GDK_Right, GDK_CONTROL_MASK,
 627                     GTK_MOVEMENT_WORDS, 1);
 628
 629   add_move_binding (binding_set, GDK_Left, GDK_CONTROL_MASK,
 630                     GTK_MOVEMENT_WORDS, -1);
 631
 632   /* Eventually we want to move by display lines, not paragraphs */
 633   add_move_binding (binding_set, GDK_Up, 0,
 634                     GTK_MOVEMENT_DISPLAY_LINES, -1);
 635
 636   add_move_binding (binding_set, GDK_Down, 0,
 637                     GTK_MOVEMENT_DISPLAY_LINES, 1);
 638
 639   add_move_binding (binding_set, GDK_p, GDK_CONTROL_MASK,
 640                     GTK_MOVEMENT_DISPLAY_LINES, -1);
 641
 642   add_move_binding (binding_set, GDK_n, GDK_CONTROL_MASK,
 643                     GTK_MOVEMENT_DISPLAY_LINES, 1);
 644
 645   add_move_binding (binding_set, GDK_a, GDK_CONTROL_MASK,
 646                     GTK_MOVEMENT_PARAGRAPH_ENDS, -1);
 647
 648   add_move_binding (binding_set, GDK_e, GDK_CONTROL_MASK,
 649                     GTK_MOVEMENT_PARAGRAPH_ENDS, 1);
 650
 651   add_move_binding (binding_set, GDK_f, GDK_MOD1_MASK,
 652                     GTK_MOVEMENT_WORDS, 1);
 653
 654   add_move_binding (binding_set, GDK_b, GDK_MOD1_MASK,
 655                     GTK_MOVEMENT_WORDS, -1);
 656
 657   add_move_binding (binding_set, GDK_Home, 0,
 658                     GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);
 659
 660   add_move_binding (binding_set, GDK_End, 0,
 661                     GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);
 662
 663   add_move_binding (binding_set, GDK_Home, GDK_CONTROL_MASK,
 664                     GTK_MOVEMENT_BUFFER_ENDS, -1);
 665
 666   add_move_binding (binding_set, GDK_End, GDK_CONTROL_MASK,
 667                     GTK_MOVEMENT_BUFFER_ENDS, 1);
 668
 669   add_move_binding (binding_set, GDK_Page_Up, 0,
 670                     GTK_MOVEMENT_PAGES, -1);
 671
 672   add_move_binding (binding_set, GDK_Page_Down, 0,
 673                     GTK_MOVEMENT_PAGES, 1);
 674
 675
 676   /* Setting the cut/paste/copy anchor */
 677   gtk_binding_entry_add_signal (binding_set, GDK_space, GDK_CONTROL_MASK,
 678                                 "set_anchor", 0);
 679
 680   /* Deleting text */
 681   gtk_binding_entry_add_signal (binding_set, GDK_Delete, 0,
 682                                 "delete_from_cursor", 2,
 683                                 GTK_TYPE_ENUM, GTK_DELETE_CHARS,
 684                                 GTK_TYPE_INT, 1);
 685
 686   gtk_binding_entry_add_signal (binding_set, GDK_d, GDK_CONTROL_MASK,
 687                                 "delete_from_cursor", 2,
 688                                 GTK_TYPE_ENUM, GTK_DELETE_CHARS,
 689                                 GTK_TYPE_INT, 1);
 690
 691   gtk_binding_entry_add_signal (binding_set, GDK_BackSpace, 0,
 692                                 "delete_from_cursor", 2,
 693                                 GTK_TYPE_ENUM, GTK_DELETE_CHARS,
 694                                 GTK_TYPE_INT, -1);
 695
 696   gtk_binding_entry_add_signal (binding_set, GDK_Delete, GDK_CONTROL_MASK,
 697                                 "delete_from_cursor", 2,
 698                                 GTK_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
 699                                 GTK_TYPE_INT, 1);
 700
 701   gtk_binding_entry_add_signal (binding_set, GDK_d, GDK_MOD1_MASK,
 702                                 "delete_from_cursor", 2,
 703                                 GTK_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
 704                                 GTK_TYPE_INT, 1);
 705
 706   gtk_binding_entry_add_signal (binding_set, GDK_BackSpace, GDK_CONTROL_MASK,
 707                                 "delete_from_cursor", 2,
 708                                 GTK_TYPE_ENUM, GTK_DELETE_WORD_ENDS,
 709                                 GTK_TYPE_INT, -1);
 710
 711   gtk_binding_entry_add_signal (binding_set, GDK_k, GDK_CONTROL_MASK,
 712                                 "delete_from_cursor", 2,
 713                                 GTK_TYPE_ENUM, GTK_DELETE_PARAGRAPH_ENDS,
 714                                 GTK_TYPE_INT, 1);
 715
 716   gtk_binding_entry_add_signal (binding_set, GDK_u, GDK_CONTROL_MASK,
 717                                 "delete_from_cursor", 2,
 718                                 GTK_TYPE_ENUM, GTK_DELETE_PARAGRAPHS,
 719                                 GTK_TYPE_INT, 1);
 720
 721   gtk_binding_entry_add_signal (binding_set, GDK_space, GDK_MOD1_MASK,
 722                                 "delete_from_cursor", 2,
 723                                 GTK_TYPE_ENUM, GTK_DELETE_WHITESPACE,
 724                                 GTK_TYPE_INT, 1);
 725   gtk_binding_entry_add_signal (binding_set, GDK_space, GDK_MOD1_MASK,
 726                                 "insert_at_cursor", 1,
 727                                 GTK_TYPE_STRING, " ");
 728
 729   gtk_binding_entry_add_signal (binding_set, GDK_backslash, GDK_MOD1_MASK,
 730                                 "delete_from_cursor", 2,
 731                                 GTK_TYPE_ENUM, GTK_DELETE_WHITESPACE,
 732                                 GTK_TYPE_INT, 1);
 733
 734   /* Cut/copy/paste */
 735
 736   gtk_binding_entry_add_signal (binding_set, GDK_x, GDK_CONTROL_MASK,
 737                                 "cut_clipboard", 0);
 738
 739   gtk_binding_entry_add_signal (binding_set, GDK_w, GDK_CONTROL_MASK,
 740                                 "cut_clipboard", 0);
 741
 742   gtk_binding_entry_add_signal (binding_set, GDK_c, GDK_CONTROL_MASK,
 743                                 "copy_clipboard", 0);
 744
 745   gtk_binding_entry_add_signal (binding_set, GDK_v, GDK_CONTROL_MASK,
 746                                 "paste_clipboard", 0);
 747
 748   gtk_binding_entry_add_signal (binding_set, GDK_y, GDK_CONTROL_MASK,
 749                                 "paste_clipboard", 0);
 750
 751   /* Overwrite */
 752   gtk_binding_entry_add_signal (binding_set, GDK_Insert, 0,
 753                                 "toggle_overwrite", 0);
 754 }
 755
 756 void
 757 gtk_text_view_init (GtkTextView *text_view)
 758 {
 759   GtkWidget *widget;
 760
 761   widget = GTK_WIDGET (text_view);
 762
 763   GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_FOCUS);
 764
 765   /* Set up default style */
 766   text_view->wrap_mode = GTK_WRAP_NONE;
 767   text_view->pixels_above_lines = 0;
 768   text_view->pixels_below_lines = 0;
 769   text_view->pixels_inside_wrap = 0;
 770   text_view->justify = GTK_JUSTIFY_LEFT;
 771   text_view->left_margin = 0;
 772   text_view->right_margin = 0;
 773   text_view->indent = 0;
 774   text_view->tabs = NULL;
 775   text_view->editable = TRUE;
 776
 777   gtk_drag_dest_set (widget,
 778                      GTK_DEST_DEFAULT_DROP,
 779                      target_table, G_N_ELEMENTS (target_table),
 780                      GDK_ACTION_COPY | GDK_ACTION_MOVE);
 781
 782   text_view->virtual_cursor_x = -1;
 783   text_view->virtual_cursor_y = -1;
 784
 785   /* This object is completely private. No external entity can gain a reference
 786    * to it; so we create it here and destroy it in finalize ().
 787    */
 788   text_view->im_context = gtk_im_multicontext_new ();
 789
 790   gtk_signal_connect (GTK_OBJECT (text_view->im_context), "commit",
 791                       GTK_SIGNAL_FUNC (gtk_text_view_commit_handler), text_view);
 792
 793   gtk_signal_connect (GTK_OBJECT (text_view->im_context), "preedit_changed",
 794                       GTK_SIGNAL_FUNC (gtk_text_view_preedit_changed_handler), text_view);
 795
 796   text_view->cursor_visible = TRUE;
 797
 798   text_view->text_window = text_window_new (GTK_TEXT_WINDOW_TEXT,
 799                                             widget, 200, 200);
 800
 801   text_view->drag_start_x = -1;
 802   text_view->drag_start_y = -1;
 803 }
 804
 805 /**
 806  * gtk_text_view_new:
 807  *
 808  * Creates a new #GtkTextView. If you don't call gtk_text_view_set_buffer()
 809  * before using the text view, an empty default buffer will be created
 810  * for you. Get the buffer with gtk_text_view_get_buffer(). If you want
 811  * to specify your own buffer, consider gtk_text_view_new_with_buffer().
 812  *
 813  * Return value: a new #GtkTextView
 814  **/
 815 GtkWidget*
 816 gtk_text_view_new (void)
 817 {
 818   return GTK_WIDGET (gtk_type_new (gtk_text_view_get_type ()));
 819 }
 820
 821 /**
 822  * gtk_text_view_new_with_buffer:
 823  * @buffer: a #GtkTextBuffer
 824  *
 825  * Creates a new #GtkTextView widget displaying the buffer
 826  * @buffer. One buffer can be shared among many widgets.
 827  * @buffer may be NULL to create a default buffer, in which case
 828  * this function is equivalent to gtk_text_view_new(). The
 829  * text view adds its own reference count to the buffer; it does not
 830  * take over an existing reference.
 831  *
 832  * Return value: a new #GtkTextView.
 833  **/
 834 GtkWidget*
 835 gtk_text_view_new_with_buffer (GtkTextBuffer *buffer)
 836 {
 837   GtkTextView *text_view;
 838
 839   text_view = (GtkTextView*)gtk_text_view_new ();
 840
 841   gtk_text_view_set_buffer (text_view, buffer);
 842
 843   return GTK_WIDGET (text_view);
 844 }
 845
 846 /**
 847  * gtk_text_view_set_buffer:
 848  * @text_view: a #GtkTextView
 849  * @buffer: a #GtkTextBuffer
 850  *
 851  * Sets @buffer as the buffer being displayed by @text_view. The previous
 852  * buffer displayed by the text view is unreferenced, and a reference is
 853  * added to @buffer. If you owned a reference to @buffer before passing it
 854  * to this function, you must remove that reference yourself; #GtkTextView
 855  * will not "adopt" it.
 856  *
 857  **/
 858 void
 859 gtk_text_view_set_buffer (GtkTextView   *text_view,
 860                           GtkTextBuffer *buffer)
 861 {
 862   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
 863   g_return_if_fail (buffer == NULL || GTK_IS_TEXT_BUFFER (buffer));
 864
 865   if (text_view->buffer == buffer)
 866     return;
 867
 868   if (text_view->buffer != NULL)
 869     {
 870       /* Destroy all anchored children */
 871       GSList *tmp_list;
 872       GSList *copy;
 873
 874       copy = g_slist_copy (text_view->children);
 875       tmp_list = copy;
 876       while (tmp_list != NULL)
 877         {
 878           GtkTextViewChild *vc = tmp_list->data;
 879
 880           if (vc->anchor)
 881             {
 882               gtk_widget_destroy (vc->widget);
 883               /* vc may now be invalid! */
 884             }
 885
 886           tmp_list = g_slist_next (tmp_list);
 887         }
 888
 889       g_slist_free (copy);
 890
 891       g_signal_handlers_disconnect_by_func (G_OBJECT (text_view->buffer),
 892                                             gtk_text_view_mark_set_handler, text_view);
 893       g_object_unref (G_OBJECT (text_view->buffer));
 894       text_view->dnd_mark = NULL;
 895     }
 896
 897   text_view->buffer = buffer;
 898
 899   if (buffer != NULL)
 900     {
 901       GtkTextIter start;
 902
 903       g_object_ref (G_OBJECT (buffer));
 904
 905       if (text_view->layout)
 906         gtk_text_layout_set_buffer (text_view->layout, buffer);
 907
 908       gtk_text_buffer_get_iter_at_offset (text_view->buffer, &start, 0);
 909
 910       text_view->dnd_mark = gtk_text_buffer_create_mark (text_view->buffer,
 911                                                          "gtk_drag_target",
 912                                                          &start, FALSE);
 913
 914       text_view->first_para_mark = gtk_text_buffer_create_mark (text_view->buffer,
 915                                                                 NULL,
 916                                                                 &start, TRUE);
 917
 918       text_view->first_para_pixels = 0;
 919
 920       g_signal_connect_data (G_OBJECT (text_view->buffer), "mark_set",
 921                              gtk_text_view_mark_set_handler, text_view,
 922                              NULL, FALSE, FALSE);
 923     }
 924
 925   if (GTK_WIDGET_VISIBLE (text_view))
 926     gtk_widget_queue_draw (GTK_WIDGET (text_view));
 927 }
 928
 929 static GtkTextBuffer*
 930 get_buffer (GtkTextView *text_view)
 931 {
 932   if (text_view->buffer == NULL)
 933     {
 934       GtkTextBuffer *b;
 935       b = gtk_text_buffer_new (NULL);
 936       gtk_text_view_set_buffer (text_view, b);
 937       g_object_unref (G_OBJECT (b));
 938     }
 939
 940   return text_view->buffer;
 941 }
 942
 943 /**
 944  * gtk_text_view_get_buffer:
 945  * @text_view: a #GtkTextView
 946  *
 947  * Returns the #GtkTextBuffer being displayed by this text view.
 948  * The reference count on the buffer is not incremented; the caller
 949  * of this function won't own a new reference.
 950  *
 951  * Return value: a #GtkTextBuffer
 952  **/
 953 GtkTextBuffer*
 954 gtk_text_view_get_buffer (GtkTextView *text_view)
 955 {
 956   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);
 957
 958   return get_buffer (text_view);
 959 }
 960
 961 /**
 962  * gtk_text_view_get_iter_at_location:
 963  * @text_view: a #GtkTextView
 964  * @iter: a #GtkTextIter
 965  * @x: x position, in buffer coordinates
 966  * @y: y position, in buffer coordinates
 967  *
 968  * Retrieves the iterator at buffer coordinates @x and @y. Buffer
 969  * coordinates are coordinates for the entire buffer, not just the
 970  * currently-displayed portion.  If you have coordinates from an
 971  * event, you have to convert those to buffer coordinates with
 972  * gtk_text_view_window_to_buffer_coords().
 973  *
 974  **/
 975 void
 976 gtk_text_view_get_iter_at_location (GtkTextView *text_view,
 977                                     GtkTextIter *iter,
 978                                     gint         x,
 979                                     gint         y)
 980 {
 981   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
 982   g_return_if_fail (iter != NULL);
 983   g_return_if_fail (text_view->layout != NULL);
 984
 985   gtk_text_layout_get_iter_at_pixel (text_view->layout,
 986                                      iter,
 987                                      x,
 988                                      y);
 989 }
 990
 991 /**
 992  * gtk_text_view_get_iter_location:
 993  * @text_view: a #GtkTextView
 994  * @iter: a #GtkTextIter
 995  * @location: bounds of the character at @iter
 996  *
 997  * Gets a rectangle which roughly contains the character at @iter.
 998  * The rectangle position is in buffer coordinates; use
 999  * gtk_text_view_buffer_to_window_coords() to convert these
1000  * coordinates to coordinates for one of the windows in the text view.
1001  *
1002  **/
1003 void
1004 gtk_text_view_get_iter_location (GtkTextView       *text_view,
1005                                  const GtkTextIter *iter,
1006                                  GdkRectangle      *location)
1007 {
1008   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1009   g_return_if_fail (gtk_text_iter_get_buffer (iter) == get_buffer (text_view));
1010
1011   gtk_text_layout_get_iter_location (text_view->layout, iter, location);
1012 }
1013
1014 /**
1015  * gtk_text_view_get_line_yrange:
1016  * @text_view: a #GtkTextView
1017  * @iter: a #GtkTextIter
1018  * @y: return location for a y coordinate
1019  * @height: return location for a height
1020  *
1021  * Gets the y coordinate of the top of the line containing @iter,
1022  * and the height of the line. The coordinate is a buffer coordinate;
1023  * convert to window coordinates with gtk_text_view_buffer_to_window_coords().
1024  *
1025  **/
1026 void
1027 gtk_text_view_get_line_yrange (GtkTextView       *text_view,
1028                                const GtkTextIter *iter,
1029                                gint              *y,
1030                                gint              *height)
1031 {
1032   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1033   g_return_if_fail (gtk_text_iter_get_buffer (iter) == get_buffer (text_view));
1034
1035   gtk_text_layout_get_line_yrange (text_view->layout,
1036                                    iter,
1037                                    y,
1038                                    height);
1039 }
1040
1041 /**
1042  * gtk_text_view_get_line_at_y:
1043  * @text_view: a #GtkTextView
1044  * @target_iter: a #GtkTextIter
1045  * @y: a y coordinate
1046  * @line_top: return location for top coordinate of the line
1047  *
1048  * Gets the #GtkTextIter at the start of the line containing
1049  * the coordinate @y. @y is in buffer coordinates, convert from
1050  * window coordinates with gtk_text_view_window_to_buffer_coords().
1051  * If non-%NULL, @line_top will be filled with the coordinate of the top
1052  * edge of the line.
1053  **/
1054 void
1055 gtk_text_view_get_line_at_y (GtkTextView *text_view,
1056                              GtkTextIter *target_iter,
1057                              gint         y,
1058                              gint        *line_top)
1059 {
1060   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1061
1062   gtk_text_layout_get_line_at_y (text_view->layout,
1063                                  target_iter,
1064                                  y,
1065                                  line_top);
1066 }
1067
1068 static gboolean
1069 set_adjustment_clamped (GtkAdjustment *adj, gdouble val)
1070 {
1071   /* We don't really want to clamp to upper; we want to clamp to
1072      upper - page_size which is the highest value the scrollbar
1073      will let us reach. */
1074   if (val > (adj->upper - adj->page_size))
1075     val = adj->upper - adj->page_size;
1076
1077   if (val < adj->lower)
1078     val = adj->lower;
1079
1080   if (val != adj->value)
1081     {
1082       gtk_adjustment_set_value (adj, val);
1083       return TRUE;
1084     }
1085   else
1086     return FALSE;
1087 }
1088
1089 /**
1090  * gtk_text_view_scroll_to_iter:
1091  * @text_view: a #GtkTextView
1092  * @iter: a #GtkTextIter
1093  * @within_margin: margin as a [0.0,0.5) fraction of screen size
1094  * @use_align: whether to use alignment arguments (if %FALSE, just get the mark onscreen)
1095  * @xalign: horizontal alignment of mark within visible area.
1096  * @yalign: vertical alignment of mark within visible area
1097  *
1098  * Scrolls @text_view so that @iter is on the screen in the position
1099  * indicated by @xalign and @yalign. An alignment of 0.0 indicates
1100  * left or top, 1.0 indicates right or bottom, 0.5 means center. If @use_align
1101  * is %FALSE, the text scrolls the minimal distance to get the mark onscreen,
1102  * possibly not scrolling at all. The effective screen for purposes
1103  * of this function is reduced by a margin of size @within_margin.
1104  * NOTE: This function uses the currently-computed height of the
1105  * lines in the text buffer. Note that line heights are computed
1106  * in an idle handler; so this function may not have the desired effect
1107  * if it's called before the height computations. To avoid oddness,
1108  * consider using gtk_text_view_scroll_to_mark() which saves a point
1109  * to be scrolled to after line validation.
1110  *
1111  * Return value: %TRUE if scrolling occurred
1112  **/
1113 gboolean
1114 gtk_text_view_scroll_to_iter (GtkTextView   *text_view,
1115                               GtkTextIter   *iter,
1116                               gdouble        within_margin,
1117                               gboolean       use_align,
1118                               gdouble        xalign,
1119                               gdouble        yalign)
1120 {
1121   GdkRectangle rect;
1122   GdkRectangle screen;
1123   gint screen_bottom;
1124   gint screen_right;
1125   gint scroll_dest;
1126   GtkWidget *widget;
1127   gboolean retval = FALSE;
1128   gint scroll_inc;
1129   gint screen_xoffset, screen_yoffset;
1130   gint current_x_scroll, current_y_scroll;
1131
1132   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
1133   g_return_val_if_fail (iter != NULL, FALSE);
1134   g_return_val_if_fail (within_margin >= 0.0 && within_margin < 0.5, FALSE);
1135   g_return_val_if_fail (xalign >= 0.0 && xalign <= 1.0, FALSE);
1136   g_return_val_if_fail (yalign >= 0.0 && yalign <= 1.0, FALSE);
1137
1138   widget = GTK_WIDGET (text_view);
1139
1140   DV(g_print(G_STRLOC"\n"));
1141
1142   if (!GTK_WIDGET_MAPPED (widget))
1143     {
1144       g_warning ("%s: calling this function before mapping the GtkTextView doesn't make sense, maybe try gtk_text_view_scroll_to_mark() instead", G_STRLOC);
1145       return FALSE;
1146     }
1147
1148   gtk_text_layout_get_iter_location (text_view->layout,
1149                                      iter,
1150                                      &rect);
1151
1152   current_x_scroll = text_view->xoffset;
1153   current_y_scroll = text_view->yoffset;
1154
1155   screen.x = current_x_scroll;
1156   screen.y = current_y_scroll;
1157   screen.width = SCREEN_WIDTH (widget);
1158   screen.height = SCREEN_HEIGHT (widget);
1159
1160   screen_xoffset = screen.width * within_margin;
1161   screen_yoffset = screen.height * within_margin;
1162
1163   screen.x += screen_xoffset;
1164   screen.y += screen_yoffset;
1165   screen.width -= screen_xoffset * 2;
1166   screen.height -= screen_yoffset * 2;
1167
1168   /* paranoia check */
1169   if (screen.width < 1)
1170     screen.width = 1;
1171   if (screen.height < 1)
1172     screen.height = 1;
1173
1174   screen_right = screen.x + screen.width;
1175   screen_bottom = screen.y + screen.height;
1176
1177   /* The alignment affects the point in the target character that we
1178    * choose to align. If we're doing right/bottom alignment, we align
1179    * the right/bottom edge of the character the mark is at; if we're
1180    * doing left/top we align the left/top edge of the character; if
1181    * we're doing center alignment we align the center of the
1182    * character.
1183    */
1184
1185   /* Vertical scroll */
1186
1187   scroll_inc = 0;
1188   scroll_dest = current_y_scroll;
1189
1190   if (use_align)
1191     {
1192       scroll_dest = rect.y + (rect.height * yalign) - (screen.height * yalign);
1193
1194       /* if scroll_dest < screen.y, we move a negative increment (up),
1195        * else a positive increment (down)
1196        */
1197       scroll_inc = scroll_dest - screen.y + screen_yoffset;
1198     }
1199   else
1200     {
1201       /* move minimum to get onscreen */
1202       if (rect.y < screen.y)
1203         {
1204           scroll_dest = rect.y;
1205           scroll_inc = scroll_dest - screen.y - screen_yoffset;
1206         }
1207       else if ((rect.y + rect.height) > screen_bottom)
1208         {
1209           scroll_dest = rect.y + rect.height;
1210           scroll_inc = scroll_dest - screen_bottom + screen_yoffset;
1211         }
1212     }
1213
1214   if (scroll_inc != 0)
1215     {
1216       retval = set_adjustment_clamped (get_vadjustment (text_view),
1217                                        current_y_scroll + scroll_inc);
1218     }
1219
1220   /* Horizontal scroll */
1221
1222   scroll_inc = 0;
1223   scroll_dest = current_x_scroll;
1224
1225   if (use_align)
1226     {
1227       scroll_dest = rect.x + (rect.width * xalign) - (screen.width * xalign);
1228
1229       /* if scroll_dest < screen.y, we move a negative increment (left),
1230        * else a positive increment (right)
1231        */
1232       scroll_inc = scroll_dest - screen.x + screen_xoffset;
1233     }
1234   else
1235     {
1236       /* move minimum to get onscreen */
1237       if (rect.x < screen.x)
1238         {
1239           scroll_dest = rect.x;
1240           scroll_inc = scroll_dest - screen.x - screen_xoffset;
1241         }
1242       else if ((rect.x + rect.width) > screen_right)
1243         {
1244           scroll_dest = rect.x + rect.width;
1245           scroll_inc = scroll_dest - screen_right + screen_xoffset;
1246         }
1247     }
1248
1249   if (scroll_inc != 0)
1250     {
1251       retval = set_adjustment_clamped (get_hadjustment (text_view),
1252                                        current_x_scroll + scroll_inc);
1253     }
1254
1255   if (retval)
1256     DV(g_print (">Actually scrolled ("G_STRLOC")\n"));
1257   else
1258     DV(g_print (">Didn't end up scrolling ("G_STRLOC")\n"));
1259
1260   return retval;
1261 }
1262
1263 static void
1264 free_pending_scroll (GtkTextPendingScroll *scroll)
1265 {
1266   if (!gtk_text_mark_get_deleted (scroll->mark))
1267     gtk_text_buffer_delete_mark (gtk_text_mark_get_buffer (scroll->mark),
1268                                  scroll->mark);
1269   g_object_unref (G_OBJECT (scroll->mark));
1270   g_free (scroll);
1271 }
1272
1273 static void
1274 gtk_text_view_queue_scroll (GtkTextView   *text_view,
1275                             GtkTextMark   *mark,
1276                             gdouble        within_margin,
1277                             gboolean       use_align,
1278                             gdouble        xalign,
1279                             gdouble        yalign)
1280 {
1281   GtkTextIter iter;
1282   GtkTextPendingScroll *scroll;
1283
1284   DV(g_print(G_STRLOC"\n"));
1285
1286   scroll = g_new (GtkTextPendingScroll, 1);
1287
1288   scroll->within_margin = within_margin;
1289   scroll->use_align = use_align;
1290   scroll->xalign = xalign;
1291   scroll->yalign = yalign;
1292
1293   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, mark);
1294
1295   scroll->mark = gtk_text_buffer_create_mark (get_buffer (text_view),
1296                                               NULL,
1297                                               &iter,
1298                                               gtk_text_mark_get_left_gravity (mark));
1299
1300   g_object_ref (G_OBJECT (scroll->mark));
1301
1302   if (text_view->pending_scroll)
1303     free_pending_scroll (text_view->pending_scroll);
1304
1305   text_view->pending_scroll = scroll;
1306 }
1307
1308 static gboolean
1309 gtk_text_view_flush_scroll (GtkTextView *text_view)
1310 {
1311   GtkTextIter iter, start, end;
1312   GtkTextPendingScroll *scroll;
1313   gint y0, y1, height;
1314   gboolean retval;
1315
1316   DV(g_print(G_STRLOC"\n"));
1317
1318   if (text_view->pending_scroll == NULL)
1319     return FALSE;
1320
1321   scroll = text_view->pending_scroll;
1322
1323   /* avoid recursion */
1324   text_view->pending_scroll = NULL;
1325
1326   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, scroll->mark);
1327
1328   start = iter;
1329   end = iter;
1330
1331   /* Force-validate the region around the iterator, at least the lines
1332    * on either side, so that we can meaningfully get the iter location
1333    */
1334   gtk_text_iter_backward_line (&start);
1335   gtk_text_iter_forward_line (&end);
1336
1337   gtk_text_layout_get_line_yrange (text_view->layout, &start, &y0, NULL);
1338   gtk_text_layout_get_line_yrange (text_view->layout, &end, &y1, &height);
1339
1340   DV(g_print (">Validating scroll destination ("G_STRLOC")\n"));
1341   gtk_text_layout_validate_yrange (text_view->layout, &start, y0, y1 + height);
1342
1343   DV(g_print (">Done validating scroll destination ("G_STRLOC")\n"));
1344
1345   retval = gtk_text_view_scroll_to_iter (text_view,
1346                                          &iter,
1347                                          scroll->within_margin,
1348                                          scroll->use_align,
1349                                          scroll->xalign,
1350                                          scroll->yalign);
1351
1352   free_pending_scroll (scroll);
1353
1354   return retval;
1355 }
1356
1357 static void
1358 gtk_text_view_set_adjustment_upper (GtkAdjustment *adj, gdouble upper)
1359 {
1360   if (upper != adj->upper)
1361     {
1362       gdouble min = MAX (0., upper - adj->page_size);
1363       gboolean value_changed = FALSE;
1364
1365       adj->upper = upper;
1366
1367       if (adj->value > min)
1368         {
1369           adj->value = min;
1370           value_changed = TRUE;
1371         }
1372
1373       gtk_signal_emit_by_name (GTK_OBJECT (adj), "changed");
1374       DV(g_print(">Changed adj upper to %d ("G_STRLOC")\n", upper));
1375
1376       if (value_changed)
1377         {
1378           DV(g_print(">Changed adj value because upper descreased ("G_STRLOC")\n"));
1379           gtk_signal_emit_by_name (GTK_OBJECT (adj), "value_changed");
1380         }
1381     }
1382 }
1383
1384 static void
1385 gtk_text_view_update_adjustments (GtkTextView *text_view)
1386 {
1387   gint width = 0, height = 0;
1388
1389   DV(g_print(">Updating adjustments ("G_STRLOC")\n"));
1390
1391   gtk_text_layout_get_size (text_view->layout, &width, &height);
1392
1393   if (text_view->width != width || text_view->height != height)
1394     {
1395       text_view->width = width;
1396       text_view->height = height;
1397
1398       gtk_text_view_set_adjustment_upper (get_hadjustment (text_view),
1399                                           MAX (SCREEN_WIDTH (text_view), width));
1400       gtk_text_view_set_adjustment_upper (get_vadjustment (text_view),
1401                                           MAX (SCREEN_HEIGHT (text_view), height));
1402
1403       /* hadj/vadj exist since we called get_hadjustment/get_vadjustment above */
1404
1405       /* Set up the step sizes; we'll say that a page is
1406          our allocation minus one step, and a step is
1407          1/10 of our allocation. */
1408       text_view->hadjustment->step_increment =
1409         SCREEN_WIDTH (text_view) / 10.0;
1410       text_view->hadjustment->page_increment =
1411         SCREEN_WIDTH (text_view) * 0.9;
1412
1413       text_view->vadjustment->step_increment =
1414         SCREEN_HEIGHT (text_view) / 10.0;
1415       text_view->vadjustment->page_increment =
1416         SCREEN_HEIGHT (text_view) * 0.9;
1417
1418       gtk_signal_emit_by_name (GTK_OBJECT (get_hadjustment (text_view)), "changed");
1419       gtk_signal_emit_by_name (GTK_OBJECT (get_hadjustment (text_view)), "changed");
1420     }
1421 }
1422
1423 static void
1424 gtk_text_view_update_layout_width (GtkTextView *text_view)
1425 {
1426   DV(g_print(">Updating layout width ("G_STRLOC")\n"));
1427
1428   gtk_text_view_ensure_layout (text_view);
1429
1430   gtk_text_layout_set_screen_width (text_view->layout,
1431                                     SCREEN_WIDTH (text_view));
1432 }
1433
1434 /**
1435  * gtk_text_view_scroll_to_mark:
1436  * @text_view: a #GtkTextView
1437  * @mark: a #GtkTextMark
1438  * @within_margin: margin as a [0.0,0.5) fraction of screen size
1439  * @use_align: whether to use alignment arguments (if %FALSE, just get the mark onscreen)
1440  * @xalign: horizontal alignment of mark within visible area.
1441  * @yalign: vertical alignment of mark within visible area
1442  *
1443  * Scrolls @text_view so that @mark is on the screen in the position
1444  * indicated by @xalign and @yalign. An alignment of 0.0 indicates
1445  * left or top, 1.0 indicates right or bottom, 0.5 means center. If @use_align
1446  * is %FALSE, the text scrolls the minimal distance to get the mark onscreen,
1447  * possibly not scrolling at all. The effective screen for purposes
1448  * of this function is reduced by a margin of size @within_margin.
1449  *
1450  **/
1451 void
1452 gtk_text_view_scroll_to_mark (GtkTextView *text_view,
1453                               GtkTextMark *mark,
1454                               gdouble      within_margin,
1455                               gboolean     use_align,
1456                               gdouble      xalign,
1457                               gdouble      yalign)
1458 {
1459   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1460   g_return_if_fail (GTK_IS_TEXT_MARK (mark));
1461   g_return_if_fail (within_margin >= 0.0 && within_margin < 0.5);
1462   g_return_if_fail (xalign >= 0.0 && xalign <= 1.0);
1463   g_return_if_fail (yalign >= 0.0 && yalign <= 1.0);
1464
1465   gtk_text_view_queue_scroll (text_view, mark,
1466                               within_margin,
1467                               use_align,
1468                               xalign,
1469                               yalign);
1470
1471   /* If no validation is pending, we need to go ahead and force an
1472    * immediate scroll.
1473    */
1474   if (text_view->layout &&
1475       gtk_text_layout_is_valid (text_view->layout))
1476     gtk_text_view_flush_scroll (text_view);
1477 }
1478
1479 void
1480 gtk_text_view_scroll_mark_onscreen (GtkTextView *text_view,
1481                                     GtkTextMark *mark)
1482 {
1483   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1484   g_return_if_fail (GTK_IS_TEXT_MARK (mark));
1485
1486   gtk_text_view_scroll_to_mark (text_view, mark, 0.0, FALSE, 0.0, 0.0);
1487 }
1488
1489 static gboolean
1490 clamp_iter_onscreen (GtkTextView *text_view, GtkTextIter *iter)
1491 {
1492   GdkRectangle visible_rect;
1493   gtk_text_view_get_visible_rect (text_view, &visible_rect);
1494
1495   return gtk_text_layout_clamp_iter_to_vrange (text_view->layout, iter,
1496                                                visible_rect.y,
1497                                                visible_rect.y + visible_rect.height);
1498 }
1499
1500 /**
1501  * gtk_text_view_move_mark_onscreen:
1502  * @text_view: a #GtkTextView
1503  * @mark: a #GtkTextMark
1504  *
1505  * Moves a mark within the buffer so that it's
1506  * located within the currently-visible text area.
1507  *
1508  * Return value: %TRUE if the mark moved (wasn't already onscreen)
1509  **/
1510 gboolean
1511 gtk_text_view_move_mark_onscreen (GtkTextView *text_view,
1512                                   GtkTextMark *mark)
1513 {
1514   GtkTextIter iter;
1515
1516   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
1517   g_return_val_if_fail (mark != NULL, FALSE);
1518
1519   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, mark);
1520
1521   if (clamp_iter_onscreen (text_view, &iter))
1522     {
1523       gtk_text_buffer_move_mark (get_buffer (text_view), mark, &iter);
1524       return TRUE;
1525     }
1526   else
1527     return FALSE;
1528 }
1529
1530 /**
1531  * gtk_text_view_get_visible_rect:
1532  * @text_view: a #GtkTextView
1533  * @visible_rect: rectangle to fill
1534  *
1535  * Fills @visible_rect with the currently-visible
1536  * region of the buffer, in buffer coordinates. Convert to window coordinates
1537  * with gtk_text_view_buffer_to_window_coords().
1538  **/
1539 void
1540 gtk_text_view_get_visible_rect (GtkTextView  *text_view,
1541                                 GdkRectangle *visible_rect)
1542 {
1543   GtkWidget *widget;
1544
1545   g_return_if_fail (text_view != NULL);
1546   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1547
1548   widget = GTK_WIDGET (text_view);
1549
1550   if (visible_rect)
1551     {
1552       visible_rect->x = text_view->xoffset;
1553       visible_rect->y = text_view->yoffset;
1554       visible_rect->width = SCREEN_WIDTH (widget);
1555       visible_rect->height = SCREEN_HEIGHT (widget);
1556
1557       DV(g_print(" visible rect: %d,%d %d x %d\n",
1558                  visible_rect->x,
1559                  visible_rect->y,
1560                  visible_rect->width,
1561                  visible_rect->height));
1562     }
1563 }
1564
1565 /**
1566  * gtk_text_view_set_wrap_mode:
1567  * @text_view: a #GtkTextView
1568  * @wrap_mode: a #GtkWrapMode
1569  *
1570  * Sets the line wrapping for the view.
1571  **/
1572 void
1573 gtk_text_view_set_wrap_mode (GtkTextView *text_view,
1574                              GtkWrapMode  wrap_mode)
1575 {
1576   g_return_if_fail (text_view != NULL);
1577   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1578
1579   if (text_view->wrap_mode != wrap_mode)
1580     {
1581       text_view->wrap_mode = wrap_mode;
1582
1583       if (text_view->layout)
1584         {
1585           text_view->layout->default_style->wrap_mode = wrap_mode;
1586           gtk_text_layout_default_style_changed (text_view->layout);
1587         }
1588     }
1589 }
1590
1591 /**
1592  * gtk_text_view_get_wrap_mode:
1593  * @text_view: a #GtkTextView
1594  *
1595  * Gets the line wrapping for the view.
1596  *
1597  * Return value: the line wrap setting
1598  **/
1599 GtkWrapMode
1600 gtk_text_view_get_wrap_mode (GtkTextView *text_view)
1601 {
1602   g_return_val_if_fail (text_view != NULL, GTK_WRAP_NONE);
1603   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), GTK_WRAP_NONE);
1604
1605   return text_view->wrap_mode;
1606 }
1607
1608 /**
1609  * gtk_text_view_set_editable:
1610  * @text_view: a #GtkTextView
1611  * @setting: whether it's editable
1612  *
1613  * Sets the default editability of the #GtkTextView. You can override
1614  * this default setting with tags in the buffer, using the "editable"
1615  * attribute of tags.
1616  **/
1617 void
1618 gtk_text_view_set_editable (GtkTextView *text_view,
1619                             gboolean     setting)
1620 {
1621   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1622
1623   if (text_view->editable != setting)
1624     {
1625       text_view->editable = setting;
1626
1627       if (text_view->layout)
1628         {
1629           text_view->layout->default_style->editable = text_view->editable;
1630           gtk_text_layout_default_style_changed (text_view->layout);
1631         }
1632     }
1633 }
1634
1635 /**
1636  * gtk_text_view_get_editable:
1637  * @text_view: a #GtkTextView
1638  *
1639  * Returns the default editability of the #GtkTextView. Tags in the
1640  * buffer may override this setting for some ranges of text.
1641  *
1642  * Return value: whether text is editable by default
1643  **/
1644 gboolean
1645 gtk_text_view_get_editable (GtkTextView *text_view)
1646 {
1647   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
1648
1649   return text_view->editable;
1650 }
1651
1652 void
1653 gtk_text_view_set_pixels_above_lines (GtkTextView *text_view,
1654                                       gint         pixels_above_lines)
1655 {
1656   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1657
1658   if (text_view->pixels_above_lines != pixels_above_lines)
1659     {
1660       text_view->pixels_above_lines = pixels_above_lines;
1661
1662       if (text_view->layout)
1663         {
1664           text_view->layout->default_style->pixels_above_lines = pixels_above_lines;
1665           gtk_text_layout_default_style_changed (text_view->layout);
1666         }
1667     }
1668 }
1669
1670 gint
1671 gtk_text_view_get_pixels_above_lines (GtkTextView *text_view)
1672 {
1673   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
1674
1675   return text_view->pixels_above_lines;
1676 }
1677
1678 void
1679 gtk_text_view_set_pixels_below_lines (GtkTextView *text_view,
1680                                       gint         pixels_below_lines)
1681 {
1682   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1683
1684   if (text_view->pixels_below_lines != pixels_below_lines)
1685     {
1686       text_view->pixels_below_lines = pixels_below_lines;
1687
1688       if (text_view->layout)
1689         {
1690           text_view->layout->default_style->pixels_below_lines = pixels_below_lines;
1691           gtk_text_layout_default_style_changed (text_view->layout);
1692         }
1693     }
1694 }
1695
1696 gint
1697 gtk_text_view_get_pixels_below_lines (GtkTextView *text_view)
1698 {
1699   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
1700
1701   return text_view->pixels_below_lines;
1702 }
1703
1704 void
1705 gtk_text_view_set_pixels_inside_wrap (GtkTextView *text_view,
1706                                       gint         pixels_inside_wrap)
1707 {
1708   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1709
1710   if (text_view->pixels_inside_wrap != pixels_inside_wrap)
1711     {
1712       text_view->pixels_inside_wrap = pixels_inside_wrap;
1713
1714       if (text_view->layout)
1715         {
1716           text_view->layout->default_style->pixels_inside_wrap = pixels_inside_wrap;
1717           gtk_text_layout_default_style_changed (text_view->layout);
1718         }
1719     }
1720 }
1721
1722 gint
1723 gtk_text_view_get_pixels_inside_wrap (GtkTextView *text_view)
1724 {
1725   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
1726
1727   return text_view->pixels_inside_wrap;
1728 }
1729
1730 void
1731 gtk_text_view_set_justification (GtkTextView     *text_view,
1732                                  GtkJustification justify)
1733 {
1734   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1735
1736   if (text_view->justify != justify)
1737     {
1738       text_view->justify = justify;
1739
1740       if (text_view->layout)
1741         {
1742           text_view->layout->default_style->justification = justify;
1743           gtk_text_layout_default_style_changed (text_view->layout);
1744         }
1745     }
1746 }
1747
1748 GtkJustification
1749 gtk_text_view_get_justification (GtkTextView *text_view)
1750 {
1751   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), GTK_JUSTIFY_LEFT);
1752
1753   return text_view->justify;
1754 }
1755
1756 void
1757 gtk_text_view_set_left_margin (GtkTextView *text_view,
1758                                gint         left_margin)
1759 {
1760   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1761
1762   if (text_view->left_margin != left_margin)
1763     {
1764       text_view->left_margin = left_margin;
1765
1766       if (text_view->layout)
1767         {
1768           text_view->layout->default_style->left_margin = left_margin;
1769           gtk_text_layout_default_style_changed (text_view->layout);
1770         }
1771     }
1772 }
1773
1774 gint
1775 gtk_text_view_get_left_margin (GtkTextView *text_view)
1776 {
1777   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
1778
1779   return text_view->left_margin;
1780 }
1781
1782 void
1783 gtk_text_view_set_right_margin (GtkTextView *text_view,
1784                                 gint         right_margin)
1785 {
1786   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1787
1788   if (text_view->right_margin != right_margin)
1789     {
1790       text_view->right_margin = right_margin;
1791
1792       if (text_view->layout)
1793         {
1794           text_view->layout->default_style->right_margin = right_margin;
1795           gtk_text_layout_default_style_changed (text_view->layout);
1796         }
1797     }
1798 }
1799
1800 gint
1801 gtk_text_view_get_right_margin (GtkTextView *text_view)
1802 {
1803   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
1804
1805   return text_view->right_margin;
1806 }
1807
1808 void
1809 gtk_text_view_set_indent (GtkTextView *text_view,
1810                           gint         indent)
1811 {
1812   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1813
1814   if (text_view->indent != indent)
1815     {
1816       text_view->indent = indent;
1817
1818       if (text_view->layout)
1819         {
1820           text_view->layout->default_style->indent = indent;
1821           gtk_text_layout_default_style_changed (text_view->layout);
1822         }
1823     }
1824 }
1825
1826 gint
1827 gtk_text_view_get_indent (GtkTextView *text_view)
1828 {
1829   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
1830
1831   return text_view->indent;
1832 }
1833
1834 void
1835 gtk_text_view_set_tabs (GtkTextView   *text_view,
1836                         PangoTabArray *tabs)
1837 {
1838   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1839
1840   if (text_view->tabs)
1841     pango_tab_array_free (text_view->tabs);
1842
1843   text_view->tabs = tabs ? pango_tab_array_copy (tabs) : NULL;
1844
1845   if (text_view->layout)
1846     {
1847       /* some unkosher futzing in internal struct details... */
1848       if (text_view->layout->default_style->tabs)
1849         pango_tab_array_free (text_view->layout->default_style->tabs);
1850
1851       text_view->layout->default_style->tabs =
1852         text_view->tabs ? pango_tab_array_copy (text_view->tabs) : NULL;
1853
1854       gtk_text_layout_default_style_changed (text_view->layout);
1855     }
1856 }
1857
1858 PangoTabArray*
1859 gtk_text_view_get_tabs (GtkTextView *text_view)
1860 {
1861   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);
1862
1863   return text_view->tabs ? pango_tab_array_copy (text_view->tabs) : NULL;
1864 }
1865
1866 /**
1867  * gtk_text_view_set_cursor_visible:
1868  * @text_view: a #GtkTextView
1869  * @setting: whether to show the insertion cursor
1870  *
1871  * Toggles whether the insertion point is displayed. A buffer with no editable
1872  * text probably shouldn't have a visible cursor, so you may want to turn
1873  * the cursor off.
1874  **/
1875 void
1876 gtk_text_view_set_cursor_visible    (GtkTextView   *text_view,
1877                                      gboolean       setting)
1878 {
1879   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
1880
1881   setting = (setting != FALSE);
1882
1883   if (text_view->cursor_visible != setting)
1884     {
1885       text_view->cursor_visible = setting;
1886
1887       if (GTK_WIDGET_HAS_FOCUS (text_view))
1888         {
1889           if (text_view->layout)
1890             {
1891               gtk_text_layout_set_cursor_visible (text_view->layout, setting);
1892
1893               if (setting)
1894                 gtk_text_view_start_cursor_blink (text_view, FALSE);
1895               else
1896                 gtk_text_view_stop_cursor_blink (text_view);
1897             }
1898         }
1899     }
1900 }
1901
1902 /**
1903  * gtk_text_view_get_cursor_visible:
1904  * @text_view: a #GtkTextView
1905  *
1906  * Find out whether the cursor is being displayed.
1907  *
1908  * Return value: whether the insertion mark is visible
1909  **/
1910 gboolean
1911 gtk_text_view_get_cursor_visible    (GtkTextView   *text_view)
1912 {
1913   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
1914
1915   return text_view->cursor_visible;
1916 }
1917
1918
1919 /**
1920  * gtk_text_view_place_cursor_onscreen:
1921  * @text_view: a #GtkTextView
1922  *
1923  * Moves the cursor to the currently visible region of the
1924  * buffer, it it isn't there already.
1925  *
1926  * Return value: TRUE if the cursor had to be moved.
1927  **/
1928 gboolean
1929 gtk_text_view_place_cursor_onscreen (GtkTextView *text_view)
1930 {
1931   GtkTextIter insert;
1932
1933   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
1934
1935   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
1936                                     gtk_text_buffer_get_mark (get_buffer (text_view),
1937                                                               "insert"));
1938
1939   if (clamp_iter_onscreen (text_view, &insert))
1940     {
1941       gtk_text_buffer_place_cursor (get_buffer (text_view), &insert);
1942       return TRUE;
1943     }
1944   else
1945     return FALSE;
1946 }
1947
1948 static void
1949 gtk_text_view_destroy (GtkObject *object)
1950 {
1951   GtkTextView *text_view;
1952   GtkTextLayout *layout;
1953
1954   text_view = GTK_TEXT_VIEW (object);
1955
1956   layout = text_view->layout;
1957
1958   gtk_text_view_destroy_layout (text_view);
1959   gtk_text_view_set_buffer (text_view, NULL);
1960
1961   (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
1962 }
1963
1964 static void
1965 gtk_text_view_finalize (GObject *object)
1966 {
1967   GtkTextView *text_view;
1968
1969   text_view = GTK_TEXT_VIEW (object);
1970
1971   g_return_if_fail (text_view->buffer == NULL);
1972
1973   gtk_text_view_destroy_layout (text_view);
1974   gtk_text_view_set_buffer (text_view, NULL);
1975
1976   if (text_view->pending_scroll)
1977     {
1978       free_pending_scroll (text_view->pending_scroll);
1979       text_view->pending_scroll = NULL;
1980     }
1981
1982   if (text_view->hadjustment)
1983     g_object_unref (G_OBJECT (text_view->hadjustment));
1984   if (text_view->vadjustment)
1985     g_object_unref (G_OBJECT (text_view->vadjustment));
1986
1987   text_window_free (text_view->text_window);
1988
1989   if (text_view->left_window)
1990     text_window_free (text_view->left_window);
1991
1992   if (text_view->top_window)
1993     text_window_free (text_view->top_window);
1994
1995   if (text_view->right_window)
1996     text_window_free (text_view->right_window);
1997
1998   if (text_view->bottom_window)
1999     text_window_free (text_view->bottom_window);
2000
2001   g_object_unref (G_OBJECT (text_view->im_context));
2002
2003   (* G_OBJECT_CLASS (parent_class)->finalize) (object);
2004 }
2005
2006 static void
2007 gtk_text_view_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
2008 {
2009   GtkTextView *text_view;
2010
2011   text_view = GTK_TEXT_VIEW (object);
2012
2013   switch (arg_id)
2014     {
2015     case ARG_HEIGHT_LINES:
2016       g_warning ("FIXME");
2017       break;
2018
2019     case ARG_WIDTH_COLUMNS:
2020       g_warning ("FIXME");
2021       break;
2022
2023     case ARG_PIXELS_ABOVE_LINES:
2024       gtk_text_view_set_pixels_above_lines (text_view, GTK_VALUE_INT (*arg));
2025       break;
2026
2027     case ARG_PIXELS_BELOW_LINES:
2028       gtk_text_view_set_pixels_below_lines (text_view, GTK_VALUE_INT (*arg));
2029       break;
2030
2031     case ARG_PIXELS_INSIDE_WRAP:
2032       gtk_text_view_set_pixels_inside_wrap (text_view, GTK_VALUE_INT (*arg));
2033       break;
2034
2035     case ARG_EDITABLE:
2036       gtk_text_view_set_editable (text_view, GTK_VALUE_BOOL (*arg));
2037       break;
2038
2039     case ARG_WRAP_MODE:
2040       gtk_text_view_set_wrap_mode (text_view, GTK_VALUE_ENUM (*arg));
2041       break;
2042
2043     case ARG_JUSTIFY:
2044       gtk_text_view_set_justification (text_view, GTK_VALUE_ENUM (*arg));
2045       break;
2046
2047     case ARG_LEFT_MARGIN:
2048       gtk_text_view_set_left_margin (text_view, GTK_VALUE_INT (*arg));
2049       break;
2050
2051     case ARG_RIGHT_MARGIN:
2052       gtk_text_view_set_right_margin (text_view, GTK_VALUE_INT (*arg));
2053       break;
2054
2055     case ARG_INDENT:
2056       gtk_text_view_set_indent (text_view, GTK_VALUE_INT (*arg));
2057       break;
2058
2059     case ARG_TABS:
2060       gtk_text_view_set_tabs (text_view, GTK_VALUE_POINTER (*arg));
2061       break;
2062
2063     default:
2064       g_assert_not_reached ();
2065       break;
2066     }
2067 }
2068
2069 static void
2070 gtk_text_view_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
2071 {
2072   GtkTextView *text_view;
2073
2074   text_view = GTK_TEXT_VIEW (object);
2075
2076   switch (arg_id)
2077     {
2078     case ARG_HEIGHT_LINES:
2079       g_warning ("FIXME");
2080       break;
2081
2082     case ARG_WIDTH_COLUMNS:
2083       g_warning ("FIXME");
2084       break;
2085
2086     case ARG_PIXELS_ABOVE_LINES:
2087       GTK_VALUE_INT (*arg) = text_view->pixels_above_lines;
2088       break;
2089
2090     case ARG_PIXELS_BELOW_LINES:
2091       GTK_VALUE_INT (*arg) = text_view->pixels_below_lines;
2092       break;
2093
2094     case ARG_PIXELS_INSIDE_WRAP:
2095       GTK_VALUE_INT (*arg) = text_view->pixels_inside_wrap;
2096       break;
2097
2098     case ARG_EDITABLE:
2099       GTK_VALUE_BOOL (*arg) = text_view->editable;
2100       break;
2101
2102     case ARG_WRAP_MODE:
2103       GTK_VALUE_ENUM (*arg) = text_view->wrap_mode;
2104       break;
2105
2106     case ARG_JUSTIFY:
2107       GTK_VALUE_ENUM (*arg) = text_view->justify;
2108       break;
2109
2110     case ARG_LEFT_MARGIN:
2111       GTK_VALUE_INT (*arg) = text_view->left_margin;
2112       break;
2113
2114     case ARG_RIGHT_MARGIN:
2115       GTK_VALUE_INT (*arg) = text_view->right_margin;
2116       break;
2117
2118     case ARG_INDENT:
2119       GTK_VALUE_INT (*arg) = text_view->indent;
2120       break;
2121
2122     case ARG_TABS:
2123       GTK_VALUE_POINTER (*arg) = gtk_text_view_get_tabs (text_view);
2124       break;
2125
2126     default:
2127       arg->type = GTK_TYPE_INVALID;
2128       break;
2129     }
2130 }
2131
2132 static void
2133 gtk_text_view_size_request (GtkWidget      *widget,
2134                             GtkRequisition *requisition)
2135 {
2136   GtkTextView *text_view;
2137   GSList *tmp_list;
2138
2139   text_view = GTK_TEXT_VIEW (widget);
2140
2141   requisition->width = text_view->text_window->requisition.width + FOCUS_EDGE_WIDTH * 2;
2142   requisition->height = text_view->text_window->requisition.height + FOCUS_EDGE_WIDTH * 2;
2143
2144   if (text_view->left_window)
2145     requisition->width += text_view->left_window->requisition.width;
2146
2147   if (text_view->right_window)
2148     requisition->width += text_view->right_window->requisition.width;
2149
2150   if (text_view->top_window)
2151     requisition->height += text_view->top_window->requisition.height;
2152
2153   if (text_view->bottom_window)
2154     requisition->height += text_view->bottom_window->requisition.height;
2155
2156   tmp_list = text_view->children;
2157   while (tmp_list != NULL)
2158     {
2159       GtkTextViewChild *child = tmp_list->data;
2160
2161       if (child->anchor)
2162         {
2163           GtkRequisition child_req;
2164           GtkRequisition old_req;
2165
2166           old_req = child->widget->requisition;
2167
2168           gtk_widget_size_request (child->widget, &child_req);
2169
2170           if (text_view->layout &&
2171               (old_req.width != child_req.width ||
2172                old_req.height != child_req.height))
2173             gtk_text_child_anchor_queue_resize (child->anchor,
2174                                                 text_view->layout);
2175         }
2176       else
2177         {
2178
2179         }
2180
2181       tmp_list = g_slist_next (tmp_list);
2182     }
2183 }
2184
2185 static void
2186 gtk_text_view_update_child_allocation (GtkTextView      *text_view,
2187                                        GtkTextViewChild *vc)
2188 {
2189   gint buffer_y;
2190   GtkTextIter iter;
2191   GtkAllocation allocation;
2192
2193   gtk_text_buffer_get_iter_at_child_anchor (get_buffer (text_view),
2194                                             &iter,
2195                                             vc->anchor);
2196
2197   gtk_text_layout_get_line_yrange (text_view->layout, &iter,
2198                                    &buffer_y, NULL);
2199
2200   buffer_y += vc->from_top_of_line;
2201
2202   allocation.x = vc->from_left_of_buffer;
2203   allocation.y = buffer_y;
2204   allocation.width = vc->widget->requisition.width;
2205   allocation.height = vc->widget->requisition.height;
2206
2207   gtk_widget_size_allocate (vc->widget, &allocation);
2208 }
2209
2210 static void
2211 gtk_text_view_child_allocated (GtkTextLayout *layout,
2212                                GtkWidget     *child,
2213                                gint           x,
2214                                gint           y,
2215                                gpointer       data)
2216 {
2217   GtkTextViewChild *vc = NULL;
2218   GtkTextView *text_view = data;
2219
2220   /* x,y is the position of the child from the top of the line, and
2221    * from the left of the buffer. We have to translate that into text
2222    * window coordinates, then size_allocate the child.
2223    */
2224
2225   vc = g_object_get_data (G_OBJECT (child),
2226                             "gtk-text-view-child");
2227
2228   g_assert (vc != NULL);
2229
2230   g_print ("child allocated at %d,%d\n", x, y);
2231
2232   vc->from_left_of_buffer = x;
2233   vc->from_top_of_line = y;
2234
2235   gtk_text_view_update_child_allocation (text_view, vc);
2236 }
2237
2238 static void
2239 gtk_text_view_validate_children (GtkTextView *text_view)
2240 {
2241   GSList *tmp_list;
2242
2243   DV(g_print(G_STRLOC"\n"));
2244
2245   tmp_list = text_view->children;
2246   while (tmp_list != NULL)
2247     {
2248       GtkTextViewChild *child = tmp_list->data;
2249
2250       if (child->anchor)
2251         {
2252           /* We need to force-validate the regions containing
2253            * children.
2254            */
2255           GtkTextIter child_loc;
2256           gtk_text_buffer_get_iter_at_child_anchor (get_buffer (text_view),
2257                                                     &child_loc,
2258                                                     child->anchor);
2259
2260           gtk_text_layout_validate_yrange (text_view->layout,
2261                                            &child_loc,
2262                                            0, 1);
2263         }
2264       else
2265         {
2266
2267         }
2268
2269       tmp_list = g_slist_next (tmp_list);
2270     }
2271 }
2272
2273 static void
2274 gtk_text_view_size_allocate (GtkWidget *widget,
2275                              GtkAllocation *allocation)
2276 {
2277   GtkTextView *text_view;
2278   GtkTextIter first_para;
2279   gint y;
2280   GtkAdjustment *vadj;
2281   gboolean yoffset_changed = FALSE;
2282   gint width, height;
2283   GdkRectangle text_rect;
2284   GdkRectangle left_rect;
2285   GdkRectangle right_rect;
2286   GdkRectangle top_rect;
2287   GdkRectangle bottom_rect;
2288
2289   text_view = GTK_TEXT_VIEW (widget);
2290
2291   DV(g_print(G_STRLOC"\n"));
2292
2293   widget->allocation = *allocation;
2294
2295   if (GTK_WIDGET_REALIZED (widget))
2296     {
2297       gdk_window_move_resize (widget->window,
2298                               allocation->x, allocation->y,
2299                               allocation->width, allocation->height);
2300     }
2301
2302   /* distribute width/height among child windows. Ensure all
2303    * windows get at least a 1x1 allocation.
2304    */
2305
2306   width = allocation->width - FOCUS_EDGE_WIDTH * 2;
2307
2308   if (text_view->left_window)
2309     left_rect.width = text_view->left_window->requisition.width;
2310   else
2311     left_rect.width = 1;
2312
2313   width -= left_rect.width;
2314
2315   if (text_view->right_window)
2316     right_rect.width = text_view->right_window->requisition.width;
2317   else
2318     right_rect.width = 1;
2319
2320   width -= right_rect.width;
2321
2322   text_rect.width = MAX (1, width);
2323
2324   top_rect.width = text_rect.width;
2325   bottom_rect.width = text_rect.width;
2326
2327
2328   height = allocation->height - FOCUS_EDGE_WIDTH * 2;
2329
2330   if (text_view->top_window)
2331     top_rect.height = text_view->top_window->requisition.height;
2332   else
2333     top_rect.height = 1;
2334
2335   height -= top_rect.height;
2336
2337   if (text_view->bottom_window)
2338     bottom_rect.height = text_view->bottom_window->requisition.height;
2339   else
2340     bottom_rect.height = 1;
2341
2342   height -= bottom_rect.height;
2343
2344   text_rect.height = MAX (1, height);
2345
2346   left_rect.height = text_rect.height;
2347   right_rect.height = text_rect.height;
2348
2349   /* Origins */
2350   left_rect.x = FOCUS_EDGE_WIDTH;
2351   top_rect.y = FOCUS_EDGE_WIDTH;
2352
2353   text_rect.x = left_rect.x + left_rect.width;
2354   text_rect.y = top_rect.y + top_rect.height;
2355
2356   left_rect.y = text_rect.y;
2357   right_rect.y = text_rect.y;
2358
2359   top_rect.x = text_rect.x;
2360   bottom_rect.x = text_rect.x;
2361
2362   right_rect.x = text_rect.x + text_rect.width;
2363   bottom_rect.y = text_rect.y + text_rect.height;
2364
2365   text_window_size_allocate (text_view->text_window,
2366                              &text_rect);
2367
2368   if (text_view->left_window)
2369     text_window_size_allocate (text_view->left_window,
2370                                &left_rect);
2371
2372   if (text_view->right_window)
2373     text_window_size_allocate (text_view->right_window,
2374                                &right_rect);
2375
2376   if (text_view->top_window)
2377     text_window_size_allocate (text_view->top_window,
2378                                &top_rect);
2379
2380   if (text_view->bottom_window)
2381     text_window_size_allocate (text_view->bottom_window,
2382                                &bottom_rect);
2383
2384   gtk_text_view_update_layout_width (text_view);
2385
2386   /* This is because validating children ends up size allocating them. */
2387   gtk_text_view_validate_children (text_view);
2388
2389   /* Now adjust the value of the adjustment to keep the cursor at the
2390    * same place in the buffer
2391    */
2392   gtk_text_view_get_first_para_iter (text_view, &first_para);
2393   gtk_text_layout_get_line_yrange (text_view->layout, &first_para, &y, NULL);
2394
2395   y += text_view->first_para_pixels;
2396
2397   /* Ensure h/v adj exist */
2398   get_hadjustment (text_view);
2399   get_vadjustment (text_view);
2400
2401   vadj = text_view->vadjustment;
2402   if (y > vadj->upper - vadj->page_size)
2403     y = MAX (0, vadj->upper - vadj->page_size);
2404
2405   if (y != text_view->yoffset)
2406     {
2407       vadj->value = text_view->yoffset = y;
2408       yoffset_changed = TRUE;
2409     }
2410
2411   text_view->hadjustment->page_size = SCREEN_WIDTH (text_view);
2412   text_view->hadjustment->page_increment = SCREEN_WIDTH (text_view) / 2;
2413   text_view->hadjustment->lower = 0;
2414   text_view->hadjustment->upper = MAX (SCREEN_WIDTH (text_view),
2415                                        text_view->width);
2416   gtk_signal_emit_by_name (GTK_OBJECT (text_view->hadjustment), "changed");
2417
2418   text_view->vadjustment->page_size = SCREEN_HEIGHT (text_view);
2419   text_view->vadjustment->page_increment = SCREEN_HEIGHT (text_view) / 2;
2420   text_view->vadjustment->lower = 0;
2421   text_view->vadjustment->upper = MAX (SCREEN_HEIGHT (text_view),
2422                                        text_view->height);
2423   gtk_signal_emit_by_name (GTK_OBJECT (text_view->vadjustment), "changed");
2424
2425   if (yoffset_changed)
2426     gtk_adjustment_value_changed (vadj);
2427
2428   if (text_view->first_validate_idle != 0)
2429     {
2430       /* The GTK resize loop processes all the pending exposes right
2431        * after doing the resize stuff, so the idle sizer won't have a
2432        * chance to run. So we do the work here.
2433        */
2434
2435       g_source_remove (text_view->first_validate_idle);
2436       text_view->first_validate_idle = 0;
2437
2438       if (!gtk_text_view_flush_scroll (text_view))
2439         gtk_text_view_validate_onscreen (text_view);
2440     }
2441 }
2442
2443 static void
2444 gtk_text_view_get_first_para_iter (GtkTextView *text_view,
2445                                    GtkTextIter *iter)
2446 {
2447   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), iter,
2448                                     text_view->first_para_mark);
2449 }
2450
2451 static void
2452 gtk_text_view_validate_onscreen (GtkTextView *text_view)
2453 {
2454   GtkWidget *widget = GTK_WIDGET (text_view);
2455
2456   DV(g_print(">Validating onscreen ("G_STRLOC")\n"));
2457
2458   if (SCREEN_HEIGHT (widget) > 0)
2459     {
2460       GtkTextIter first_para;
2461
2462       /* Be sure we've validated the stuff onscreen; if we
2463        * scrolled, these calls won't have any effect, because
2464        * they were called in the recursive validate_onscreen
2465        */
2466       gtk_text_view_get_first_para_iter (text_view, &first_para);
2467
2468       gtk_text_layout_validate_yrange (text_view->layout,
2469                                        &first_para,
2470                                        0,
2471                                        text_view->first_para_pixels +
2472                                        SCREEN_HEIGHT (widget));
2473     }
2474
2475   text_view->onscreen_validated = TRUE;
2476
2477   DV(g_print(">Done validating onscreen, onscreen_validated = TRUE ("G_STRLOC")\n"));
2478
2479   /* This can have the odd side effect of triggering a scroll, which should
2480    * flip "onscreen_validated" back to FALSE, but should also get us
2481    * back into this function to turn it on again.
2482    */
2483   gtk_text_view_update_adjustments (text_view);
2484
2485   g_assert (text_view->onscreen_validated);
2486 }
2487
2488 static gboolean
2489 first_validate_callback (gpointer data)
2490 {
2491   GtkTextView *text_view = data;
2492
2493   /* Note that some of this code is duplicated at the end of size_allocate,
2494    * keep in sync with that.
2495    */
2496
2497   DV(g_print(G_STRLOC"\n"));
2498
2499   /* Do this first, which means that if an "invalidate"
2500    * occurs during any of this process, a new first_validate_callback
2501    * will be installed, and we'll start again.
2502    */
2503   text_view->first_validate_idle = 0;
2504
2505   /* be sure we have up-to-date screen size set on the
2506    * layout.
2507    */
2508   gtk_text_view_update_layout_width (text_view);
2509
2510   /* Bail out if we invalidated stuff; scrolling right away will just
2511    * confuse the issue.
2512    */
2513   if (text_view->first_validate_idle != 0)
2514     {
2515       DV(g_print(">Width change forced requeue ("G_STRLOC")\n"));
2516       return FALSE;
2517     }
2518
2519   /* scroll to any marks, if that's pending. This can
2520    * jump us to the validation codepath used for scrolling
2521    * onscreen, if so we bail out.
2522    */
2523   if (!gtk_text_view_flush_scroll (text_view))
2524     gtk_text_view_validate_onscreen (text_view);
2525
2526   DV(g_print(">Leaving first validate idle ("G_STRLOC")\n"));
2527
2528   g_assert (text_view->onscreen_validated);
2529
2530   return FALSE;
2531 }
2532
2533 static gboolean
2534 incremental_validate_callback (gpointer data)
2535 {
2536   GtkTextView *text_view = data;
2537
2538   DV(g_print(G_STRLOC"\n"));
2539
2540   gtk_text_layout_validate (text_view->layout, 2000);
2541
2542   gtk_text_view_update_adjustments (text_view);
2543
2544   if (gtk_text_layout_is_valid (text_view->layout))
2545     {
2546       text_view->incremental_validate_idle = 0;
2547       return FALSE;
2548     }
2549   else
2550     return TRUE;
2551 }
2552
2553 static void
2554 invalidated_handler (GtkTextLayout *layout,
2555                      gpointer       data)
2556 {
2557   GtkTextView *text_view;
2558
2559   text_view = GTK_TEXT_VIEW (data);
2560
2561   text_view->onscreen_validated = FALSE;
2562
2563   DV(g_print(">Invalidate, onscreen_validated = FALSE ("G_STRLOC")\n"));
2564
2565   if (!text_view->first_validate_idle)
2566     text_view->first_validate_idle = g_idle_add_full (GTK_PRIORITY_RESIZE - 1, first_validate_callback, text_view, NULL);
2567
2568   if (!text_view->incremental_validate_idle)
2569     text_view->incremental_validate_idle = g_idle_add_full (GTK_TEXT_VIEW_PRIORITY_VALIDATE, incremental_validate_callback, text_view, NULL);
2570 }
2571
2572 static void
2573 changed_handler (GtkTextLayout *layout,
2574                  gint           start_y,
2575                  gint           old_height,
2576                  gint           new_height,
2577                  gpointer       data)
2578 {
2579   GtkTextView *text_view;
2580   GtkWidget *widget;
2581   GdkRectangle visible_rect;
2582   GdkRectangle redraw_rect;
2583
2584   text_view = GTK_TEXT_VIEW (data);
2585   widget = GTK_WIDGET (data);
2586
2587   DV(g_print(">Lines Validated ("G_STRLOC")\n"));
2588
2589   if (GTK_WIDGET_REALIZED (text_view))
2590     {
2591       gtk_text_view_get_visible_rect (text_view, &visible_rect);
2592
2593       redraw_rect.x = visible_rect.x;
2594       redraw_rect.width = visible_rect.width;
2595       redraw_rect.y = start_y;
2596
2597       if (old_height == new_height)
2598         redraw_rect.height = old_height;
2599       else
2600         redraw_rect.height = MAX (0, visible_rect.y + visible_rect.height - start_y);
2601
2602       if (gdk_rectangle_intersect (&redraw_rect, &visible_rect, &redraw_rect))
2603         {
2604           /* text_window_invalidate_rect() takes buffer coordinates */
2605           text_window_invalidate_rect (text_view->text_window,
2606                                        &redraw_rect);
2607
2608           DV(g_print(" invalidated rect: %d,%d %d x %d\n",
2609                      redraw_rect.x,
2610                      redraw_rect.y,
2611                      redraw_rect.width,
2612                      redraw_rect.height));
2613
2614           if (text_view->left_window)
2615             text_window_invalidate_rect (text_view->left_window,
2616                                          &redraw_rect);
2617           if (text_view->right_window)
2618             text_window_invalidate_rect (text_view->right_window,
2619                                          &redraw_rect);
2620           if (text_view->top_window)
2621             text_window_invalidate_rect (text_view->top_window,
2622                                          &redraw_rect);
2623           if (text_view->bottom_window)
2624             text_window_invalidate_rect (text_view->bottom_window,
2625                                          &redraw_rect);
2626         }
2627     }
2628
2629   if (old_height != new_height)
2630     {
2631       gboolean yoffset_changed = FALSE;
2632       GSList *tmp_list;
2633
2634       if (start_y + old_height <= text_view->yoffset - text_view->first_para_pixels)
2635         {
2636           text_view->yoffset += new_height - old_height;
2637           get_vadjustment (text_view)->value = text_view->yoffset;
2638           yoffset_changed = TRUE;
2639         }
2640
2641       if (yoffset_changed)
2642         gtk_adjustment_value_changed (get_vadjustment (text_view));
2643
2644       /* FIXME be smarter about which anchored widgets we update */
2645
2646       tmp_list = text_view->children;
2647       while (tmp_list != NULL)
2648         {
2649           GtkTextViewChild *child = tmp_list->data;
2650
2651           if (child->anchor)
2652             gtk_text_view_update_child_allocation (text_view, child);
2653
2654           tmp_list = g_slist_next (tmp_list);
2655         }
2656     }
2657 }
2658
2659 static void
2660 gtk_text_view_realize (GtkWidget *widget)
2661 {
2662   GtkTextView *text_view;
2663   GdkWindowAttr attributes;
2664   gint attributes_mask;
2665
2666   text_view = GTK_TEXT_VIEW (widget);
2667   GTK_WIDGET_SET_FLAGS (text_view, GTK_REALIZED);
2668
2669   attributes.window_type = GDK_WINDOW_CHILD;
2670   attributes.x = widget->allocation.x;
2671   attributes.y = widget->allocation.y;
2672   attributes.width = widget->allocation.width;
2673   attributes.height = widget->allocation.height;
2674   attributes.wclass = GDK_INPUT_OUTPUT;
2675   attributes.visual = gtk_widget_get_visual (widget);
2676   attributes.colormap = gtk_widget_get_colormap (widget);
2677   attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK | GDK_EXPOSURE_MASK;
2678
2679   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
2680
2681   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
2682                                    &attributes, attributes_mask);
2683   gdk_window_set_user_data (widget->window, widget);
2684
2685   /* must come before text_window_realize calls */
2686   widget->style = gtk_style_attach (widget->style, widget->window);
2687
2688   gdk_window_set_background (widget->window,
2689                              &widget->style->bg[GTK_WIDGET_STATE (widget)]);
2690
2691   text_window_realize (text_view->text_window, widget->window);
2692
2693   if (text_view->left_window)
2694     text_window_realize (text_view->left_window,
2695                          widget->window);
2696
2697   if (text_view->top_window)
2698     text_window_realize (text_view->top_window,
2699                          widget->window);
2700
2701   if (text_view->right_window)
2702     text_window_realize (text_view->right_window,
2703                          widget->window);
2704
2705   if (text_view->bottom_window)
2706     text_window_realize (text_view->bottom_window,
2707                          widget->window);
2708
2709   gtk_text_view_ensure_layout (text_view);
2710 }
2711
2712 static void
2713 gtk_text_view_unrealize (GtkWidget *widget)
2714 {
2715   GtkTextView *text_view;
2716
2717   text_view = GTK_TEXT_VIEW (widget);
2718
2719   if (text_view->first_validate_idle)
2720     {
2721       g_source_remove (text_view->first_validate_idle);
2722       text_view->first_validate_idle = 0;
2723     }
2724
2725   if (text_view->incremental_validate_idle)
2726     {
2727       g_source_remove (text_view->incremental_validate_idle);
2728       text_view->incremental_validate_idle = 0;
2729     }
2730
2731   if (text_view->popup_menu)
2732     {
2733       gtk_widget_destroy (text_view->popup_menu);
2734       text_view->popup_menu = NULL;
2735     }
2736
2737   text_window_unrealize (text_view->text_window);
2738
2739   if (text_view->left_window)
2740     text_window_unrealize (text_view->left_window);
2741
2742   if (text_view->top_window)
2743     text_window_unrealize (text_view->top_window);
2744
2745   if (text_view->right_window)
2746     text_window_unrealize (text_view->right_window);
2747
2748   if (text_view->bottom_window)
2749     text_window_unrealize (text_view->bottom_window);
2750
2751   gtk_text_view_destroy_layout (text_view);
2752
2753   (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
2754 }
2755
2756 static void
2757 gtk_text_view_style_set (GtkWidget *widget,
2758                          GtkStyle  *previous_style)
2759 {
2760   GtkTextView *text_view = GTK_TEXT_VIEW (widget);
2761
2762   if (GTK_WIDGET_REALIZED (widget))
2763     {
2764       gdk_window_set_background (widget->window,
2765                                  &widget->style->bg[GTK_WIDGET_STATE (widget)]);
2766
2767       gdk_window_set_background (text_view->text_window->bin_window,
2768                                  &widget->style->base[GTK_WIDGET_STATE (widget)]);
2769
2770       if (text_view->left_window)
2771         gdk_window_set_background (text_view->left_window->bin_window,
2772                                    &widget->style->bg[GTK_WIDGET_STATE (widget)]);
2773       if (text_view->right_window)
2774         gdk_window_set_background (text_view->right_window->bin_window,
2775                                    &widget->style->bg[GTK_WIDGET_STATE (widget)]);
2776
2777       if (text_view->top_window)
2778         gdk_window_set_background (text_view->top_window->bin_window,
2779                                    &widget->style->bg[GTK_WIDGET_STATE (widget)]);
2780
2781       if (text_view->bottom_window)
2782         gdk_window_set_background (text_view->bottom_window->bin_window,
2783                                    &widget->style->bg[GTK_WIDGET_STATE (widget)]);
2784
2785       gtk_text_view_set_attributes_from_style (text_view,
2786                                                text_view->layout->default_style,
2787                                                widget->style);
2788       gtk_text_layout_default_style_changed (text_view->layout);
2789     }
2790 }
2791
2792 static void
2793 gtk_text_view_direction_changed (GtkWidget        *widget,
2794                                  GtkTextDirection  previous_direction)
2795 {
2796   GtkTextView *text_view = GTK_TEXT_VIEW (widget);
2797
2798   if (text_view->layout)
2799     {
2800       text_view->layout->default_style->direction = gtk_widget_get_direction (widget);
2801       gtk_text_layout_default_style_changed (text_view->layout);
2802     }
2803 }
2804
2805 /*
2806  * Events
2807  */
2808
2809 static gboolean
2810 get_event_coordinates (GdkEvent *event, gint *x, gint *y)
2811 {
2812   if (event)
2813     switch (event->type)
2814       {
2815       case GDK_MOTION_NOTIFY:
2816         *x = event->motion.x;
2817         *y = event->motion.y;
2818         return TRUE;
2819         break;
2820
2821       case GDK_BUTTON_PRESS:
2822       case GDK_2BUTTON_PRESS:
2823       case GDK_3BUTTON_PRESS:
2824       case GDK_BUTTON_RELEASE:
2825         *x = event->button.x;
2826         *y = event->button.y;
2827         return TRUE;
2828         break;
2829
2830       case GDK_KEY_PRESS:
2831       case GDK_KEY_RELEASE:
2832       case GDK_ENTER_NOTIFY:
2833       case GDK_LEAVE_NOTIFY:
2834       case GDK_PROPERTY_NOTIFY:
2835       case GDK_SELECTION_CLEAR:
2836       case GDK_SELECTION_REQUEST:
2837       case GDK_SELECTION_NOTIFY:
2838       case GDK_PROXIMITY_IN:
2839       case GDK_PROXIMITY_OUT:
2840       case GDK_DRAG_ENTER:
2841       case GDK_DRAG_LEAVE:
2842       case GDK_DRAG_MOTION:
2843       case GDK_DRAG_STATUS:
2844       case GDK_DROP_START:
2845       case GDK_DROP_FINISHED:
2846       default:
2847         return FALSE;
2848         break;
2849       }
2850
2851   return FALSE;
2852 }
2853
2854 static gint
2855 emit_event_on_tags (GtkWidget   *widget,
2856                     GdkEvent    *event,
2857                     GtkTextIter *iter)
2858 {
2859   GSList *tags;
2860   GSList *tmp;
2861   gboolean retval = FALSE;
2862   GtkTextView *text_view;
2863
2864   text_view = GTK_TEXT_VIEW (widget);
2865
2866   tags = gtk_text_iter_get_tags (iter);
2867
2868   tmp = tags;
2869   while (tmp != NULL)
2870     {
2871       GtkTextTag *tag = tmp->data;
2872
2873       if (gtk_text_tag_event (tag, G_OBJECT (widget), event, iter))
2874         {
2875           retval = TRUE;
2876           break;
2877         }
2878
2879       tmp = g_slist_next (tmp);
2880     }
2881
2882   g_slist_free (tags);
2883
2884   return retval;
2885 }
2886
2887 static gint
2888 gtk_text_view_event (GtkWidget *widget, GdkEvent *event)
2889 {
2890   GtkTextView *text_view;
2891   gint x = 0, y = 0;
2892
2893   text_view = GTK_TEXT_VIEW (widget);
2894
2895   if (text_view->layout == NULL ||
2896       get_buffer (text_view) == NULL)
2897     return FALSE;
2898
2899   if (event->any.window != text_view->text_window->bin_window)
2900     return FALSE;
2901
2902   if (get_event_coordinates (event, &x, &y))
2903     {
2904       GtkTextIter iter;
2905
2906       x += text_view->xoffset;
2907       y += text_view->yoffset;
2908
2909       /* FIXME this is slow and we do it twice per event.
2910        * My favorite solution is to have GtkTextLayout cache
2911        * the last couple lookups.
2912        */
2913       gtk_text_layout_get_iter_at_pixel (text_view->layout,
2914                                          &iter,
2915                                          x, y);
2916
2917       return emit_event_on_tags (widget, event, &iter);
2918     }
2919   else if (event->type == GDK_KEY_PRESS ||
2920            event->type == GDK_KEY_RELEASE)
2921     {
2922       GtkTextMark *insert;
2923       GtkTextIter iter;
2924
2925       insert = gtk_text_buffer_get_mark (get_buffer (text_view),
2926                                          "insert");
2927
2928       gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &iter, insert);
2929
2930       return emit_event_on_tags (widget, event, &iter);
2931     }
2932   else
2933     return FALSE;
2934 }
2935
2936 static gint
2937 gtk_text_view_key_press_event (GtkWidget *widget, GdkEventKey *event)
2938 {
2939   gboolean retval = FALSE;
2940   GtkTextView *text_view = GTK_TEXT_VIEW (widget);
2941
2942   if (text_view->layout == NULL ||
2943       get_buffer (text_view) == NULL)
2944     return FALSE;
2945
2946   if (gtk_im_context_filter_keypress (text_view->im_context, event))
2947     {
2948       text_view->need_im_reset = TRUE;
2949       retval = TRUE;
2950     }
2951   else if (GTK_WIDGET_CLASS (parent_class)->key_press_event &&
2952            GTK_WIDGET_CLASS (parent_class)->key_press_event (widget, event))
2953     retval = TRUE;
2954   else if (event->keyval == GDK_Return)
2955     {
2956       gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), "\n", 1,
2957                                                     text_view->editable);
2958       gtk_text_view_scroll_to_mark (text_view,
2959                                     gtk_text_buffer_get_mark (get_buffer (text_view),
2960                                                               "insert"),
2961                                     0.0, FALSE, 0.0, 0.0);
2962       retval = TRUE;
2963     }
2964   /* Pass through Tab as literal tab, unless Control is held down */
2965   else if (event->keyval == GDK_Tab && !(event->state & GDK_CONTROL_MASK))
2966     {
2967       gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), "\t", 1,
2968                                                     text_view->editable);
2969       gtk_text_view_scroll_mark_onscreen (text_view,
2970                                           gtk_text_buffer_get_mark (get_buffer (text_view),
2971                                                                     "insert"));
2972       retval = TRUE;
2973     }
2974   else
2975     retval = FALSE;
2976
2977   gtk_text_view_start_cursor_blink (text_view, TRUE);
2978
2979   return retval;
2980 }
2981
2982 static gint
2983 gtk_text_view_key_release_event (GtkWidget *widget, GdkEventKey *event)
2984 {
2985   return FALSE;
2986 }
2987
2988 static gint
2989 gtk_text_view_button_press_event (GtkWidget *widget, GdkEventButton *event)
2990 {
2991   GtkTextView *text_view;
2992
2993   text_view = GTK_TEXT_VIEW (widget);
2994
2995   gtk_widget_grab_focus (widget);
2996
2997   if (event->window != text_view->text_window->bin_window)
2998     {
2999       /* Remove selection if any. */
3000       gtk_text_view_unselect (text_view);
3001       return FALSE;
3002     }
3003
3004 #if 0
3005   /* debug hack */
3006   if (event->button == 3 && (event->state & GDK_CONTROL_MASK) != 0)
3007     _gtk_text_buffer_spew (GTK_TEXT_VIEW (widget)->buffer);
3008   else if (event->button == 3)
3009     gtk_text_layout_spew (GTK_TEXT_VIEW (widget)->layout);
3010 #endif
3011
3012   if (event->type == GDK_BUTTON_PRESS)
3013     {
3014       gtk_text_view_reset_im_context (text_view);
3015
3016       if (event->button == 1)
3017         {
3018           /* If we're in the selection, start a drag copy/move of the
3019            * selection; otherwise, start creating a new selection.
3020            */
3021           GtkTextIter iter;
3022           GtkTextIter start, end;
3023
3024           gtk_text_layout_get_iter_at_pixel (text_view->layout,
3025                                              &iter,
3026                                              event->x + text_view->xoffset,
3027                                              event->y + text_view->yoffset);
3028
3029           if (gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
3030                                                     &start, &end) &&
3031               gtk_text_iter_in_range (&iter, &start, &end))
3032             {
3033               text_view->drag_start_x = event->x;
3034               text_view->drag_start_y = event->y;
3035             }
3036           else
3037             {
3038               gtk_text_view_start_selection_drag (text_view, &iter, event);
3039             }
3040
3041           return TRUE;
3042         }
3043       else if (event->button == 2)
3044         {
3045           GtkTextIter iter;
3046
3047           gtk_text_layout_get_iter_at_pixel (text_view->layout,
3048                                              &iter,
3049                                              event->x + text_view->xoffset,
3050                                              event->y + text_view->yoffset);
3051
3052           gtk_text_buffer_paste_primary (get_buffer (text_view),
3053                                          &iter,
3054                                          text_view->editable);
3055           return TRUE;
3056         }
3057       else if (event->button == 3)
3058         {
3059           gtk_text_view_do_popup (text_view, event);
3060         }
3061     }
3062   else if ((event->type == GDK_2BUTTON_PRESS ||
3063             event->type == GDK_3BUTTON_PRESS) &&
3064            event->button == 1)
3065     {
3066       GtkTextIter start, end;
3067
3068       /* End the selection drag, otherwise we'd clear the new
3069        * word/line selection on button release
3070        */
3071       gtk_text_view_end_selection_drag (text_view, event);
3072
3073       gtk_text_layout_get_iter_at_pixel (text_view->layout,
3074                                          &start,
3075                                          event->x + text_view->xoffset,
3076                                          event->y + text_view->yoffset);
3077
3078       end = start;
3079
3080       if (event->type == GDK_2BUTTON_PRESS)
3081         {
3082           if (gtk_text_iter_inside_word (&start))
3083             {
3084               if (!gtk_text_iter_starts_word (&start))
3085                 gtk_text_iter_backward_word_start (&start);
3086
3087               if (!gtk_text_iter_ends_word (&end))
3088                 gtk_text_iter_forward_word_end (&end);
3089             }
3090         }
3091       else if (event->type == GDK_3BUTTON_PRESS)
3092         {
3093           if (gtk_text_view_starts_display_line (text_view, &start))
3094             {
3095               /* If on a display line boundary, we assume the user
3096                * clicked off the end of a line and we therefore select
3097                * the line before the boundary.
3098                */
3099               gtk_text_view_backward_display_line_start (text_view, &start);
3100             }
3101           else
3102             {
3103               /* start isn't on the start of a line, so we move it to the
3104                * start, and move end to the end unless it's already there.
3105                */
3106               gtk_text_view_backward_display_line_start (text_view, &start);
3107
3108               if (!gtk_text_view_starts_display_line (text_view, &end))
3109                 gtk_text_view_forward_display_line_end (text_view, &end);
3110             }
3111         }
3112
3113       gtk_text_buffer_move_mark (get_buffer (text_view),
3114                                  gtk_text_buffer_get_selection_bound (get_buffer (text_view)),
3115                                  &start);
3116       gtk_text_buffer_move_mark (get_buffer (text_view),
3117                                  gtk_text_buffer_get_insert (get_buffer (text_view)),
3118                                  &end);
3119
3120       text_view->just_selected_element = TRUE;
3121
3122       return TRUE;
3123     }
3124
3125   return FALSE;
3126 }
3127
3128 static gint
3129 gtk_text_view_button_release_event (GtkWidget *widget, GdkEventButton *event)
3130 {
3131   GtkTextView *text_view;
3132
3133   text_view = GTK_TEXT_VIEW (widget);
3134
3135   if (event->window != text_view->text_window->bin_window)
3136     return FALSE;
3137
3138   if (event->button == 1)
3139     {
3140       if (text_view->drag_start_x >= 0)
3141         {
3142           text_view->drag_start_x = -1;
3143           text_view->drag_start_y = -1;
3144         }
3145
3146       if (gtk_text_view_end_selection_drag (GTK_TEXT_VIEW (widget), event))
3147         return TRUE;
3148       else if (text_view->just_selected_element)
3149         {
3150           text_view->just_selected_element = FALSE;
3151           return FALSE;
3152         }
3153       else
3154         {
3155           /* Unselect everything; probably we were dragging, or clicked
3156            * outside the text.
3157            */
3158           gtk_text_view_unselect (text_view);
3159           return FALSE;
3160         }
3161     }
3162
3163   return FALSE;
3164 }
3165
3166 static gint
3167 gtk_text_view_focus_in_event (GtkWidget *widget, GdkEventFocus *event)
3168 {
3169   GtkTextView *text_view = GTK_TEXT_VIEW (widget);
3170
3171   GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS);
3172   gtk_widget_queue_draw (widget);
3173
3174   if (text_view->cursor_visible && text_view->layout)
3175     {
3176       gtk_text_layout_set_cursor_visible (text_view->layout, TRUE);
3177       gtk_text_view_start_cursor_blink (text_view, FALSE);
3178     }
3179
3180   text_view->need_im_reset = TRUE;
3181   gtk_im_context_focus_in (GTK_TEXT_VIEW (widget)->im_context);
3182
3183   return FALSE;
3184 }
3185
3186 static gint
3187 gtk_text_view_focus_out_event (GtkWidget *widget, GdkEventFocus *event)
3188 {
3189   GtkTextView *text_view = GTK_TEXT_VIEW (widget);
3190
3191   GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS);
3192   gtk_widget_queue_draw (widget);
3193
3194   if (text_view->cursor_visible && text_view->layout)
3195     {
3196       gtk_text_layout_set_cursor_visible (text_view->layout, FALSE);
3197       gtk_text_view_stop_cursor_blink (text_view);
3198     }
3199
3200   text_view->need_im_reset = TRUE;
3201   gtk_im_context_focus_out (GTK_TEXT_VIEW (widget)->im_context);
3202
3203   return FALSE;
3204 }
3205
3206 static gint
3207 gtk_text_view_motion_event (GtkWidget *widget, GdkEventMotion *event)
3208 {
3209   GtkTextView *text_view = GTK_TEXT_VIEW (widget);
3210
3211   if (event->window == text_view->text_window->bin_window &&
3212       text_view->drag_start_x >= 0)
3213     {
3214       gint x, y;
3215
3216       gdk_window_get_pointer (text_view->text_window->bin_window,
3217                               &x, &y, NULL);
3218
3219       if (gtk_drag_check_threshold (widget,
3220                                     text_view->drag_start_x,
3221                                     text_view->drag_start_y,
3222                                     x, y))
3223         {
3224           GtkTextIter iter;
3225           gint buffer_x, buffer_y;
3226
3227           gtk_text_view_window_to_buffer_coords (text_view,
3228                                                  GTK_TEXT_WINDOW_TEXT,
3229                                                  text_view->drag_start_x,
3230                                                  text_view->drag_start_y,
3231                                                  &buffer_x,
3232                                                  &buffer_y);
3233
3234           gtk_text_layout_get_iter_at_pixel (text_view->layout,
3235                                              &iter,
3236                                              buffer_x, buffer_y);
3237
3238           gtk_text_view_start_selection_dnd (text_view, &iter, event);
3239           return TRUE;
3240         }
3241     }
3242
3243   return FALSE;
3244 }
3245
3246 static void
3247 gtk_text_view_paint (GtkWidget *widget, GdkRectangle *area)
3248 {
3249   GtkTextView *text_view;
3250
3251   text_view = GTK_TEXT_VIEW (widget);
3252
3253   g_return_if_fail (text_view->layout != NULL);
3254   g_return_if_fail (text_view->xoffset >= 0);
3255   g_return_if_fail (text_view->yoffset >= 0);
3256
3257   if (!text_view->onscreen_validated)
3258     {
3259       G_BREAKPOINT ();
3260       g_warning (G_STRLOC ": somehow some text lines were modified or scrolling occurred since the last validation of lines on the screen");
3261     }
3262
3263 #if 0
3264   printf ("painting %d,%d  %d x %d\n",
3265           area->x, area->y,
3266           area->width, area->height);
3267 #endif
3268
3269   gtk_text_layout_draw (text_view->layout,
3270                         widget,
3271                         text_view->text_window->bin_window,
3272                         text_view->xoffset,
3273                         text_view->yoffset,
3274                         area->x, area->y,
3275                         area->width, area->height);
3276 }
3277
3278 static gint
3279 gtk_text_view_expose_event (GtkWidget *widget, GdkEventExpose *event)
3280 {
3281 #if 0
3282   {
3283     GdkWindow *win = event->window;
3284     GdkColor color = { 0, 0, 0, 65535 };
3285     GdkGC *gc = gdk_gc_new (win);
3286     gdk_gc_set_rgb_fg_color (gc, &color);
3287     gdk_draw_rectangle (win,
3288                         gc, TRUE,
3289                         event->area.x, event->area.y,
3290                         event->area.width, event->area.height);
3291     gdk_gc_unref (gc);
3292   }
3293 #endif
3294
3295   if (event->window == gtk_text_view_get_window (GTK_TEXT_VIEW (widget),
3296                                                  GTK_TEXT_WINDOW_TEXT))
3297     {
3298       DV(g_print (">Exposed ("G_STRLOC")\n"));
3299       gtk_text_view_paint (widget, &event->area);
3300     }
3301
3302   if (event->window == widget->window)
3303     gtk_text_view_draw_focus (widget);
3304
3305   return TRUE;
3306 }
3307
3308 static void
3309 gtk_text_view_draw_focus (GtkWidget *widget)
3310 {
3311   if (GTK_WIDGET_DRAWABLE (widget))
3312     {
3313       if (GTK_WIDGET_HAS_FOCUS (widget))
3314         {
3315           gtk_paint_focus (widget->style, widget->window,
3316                            NULL, widget, "textview",
3317                            0, 0,
3318                            widget->allocation.width - 1,
3319                            widget->allocation.height - 1);
3320         }
3321       else
3322         {
3323           gdk_window_clear (widget->window);
3324         }
3325     }
3326 }
3327
3328 /*
3329  * Container
3330  */
3331
3332 static void
3333 gtk_text_view_add (GtkContainer *container,
3334                    GtkWidget    *child)
3335 {
3336   g_return_if_fail (GTK_IS_TEXT_VIEW (container));
3337   g_return_if_fail (GTK_IS_WIDGET (child));
3338
3339   /* This is pretty random. */
3340   gtk_text_view_add_child_in_window (GTK_TEXT_VIEW (container),
3341                                      child,
3342                                      GTK_TEXT_WINDOW_WIDGET,
3343                                      0, 0);
3344 }
3345
3346 static void
3347 gtk_text_view_remove (GtkContainer *container,
3348                       GtkWidget    *child)
3349 {
3350   GSList *iter;
3351   GtkTextView *text_view;
3352   GtkTextViewChild *vc;
3353
3354   g_return_if_fail (GTK_IS_TEXT_VIEW (container));
3355   g_return_if_fail (GTK_IS_WIDGET (child));
3356   g_return_if_fail (child->parent == (GtkWidget*) container);
3357
3358   text_view = GTK_TEXT_VIEW (container);
3359
3360   vc = NULL;
3361   iter = text_view->children;
3362
3363   while (iter != NULL)
3364     {
3365       vc = iter->data;
3366
3367       if (vc->widget == child)
3368         break;
3369
3370       iter = g_slist_next (iter);
3371     }
3372
3373   g_assert (iter != NULL); /* be sure we had the child in the list */
3374
3375   text_view->children = g_slist_remove (text_view->children, vc);
3376
3377   gtk_widget_unparent (vc->widget);
3378
3379   text_view_child_free (vc);
3380 }
3381
3382 static void
3383 gtk_text_view_forall (GtkContainer *container,
3384                       gboolean      include_internals,
3385                       GtkCallback   callback,
3386                       gpointer      callback_data)
3387 {
3388   GSList *iter;
3389   GtkTextView *text_view;
3390
3391   g_return_if_fail (GTK_IS_TEXT_VIEW (container));
3392   g_return_if_fail (callback != NULL);
3393
3394   text_view = GTK_TEXT_VIEW (container);
3395
3396   iter = text_view->children;
3397
3398   while (iter != NULL)
3399     {
3400       GtkTextViewChild *vc = iter->data;
3401
3402       (* callback) (vc->widget, callback_data);
3403
3404       iter = g_slist_next (iter);
3405     }
3406 }
3407
3408 /* Note that CURSOR_ON_TIME is effectively added to PREBLINK_TIME
3409  * because blinking starts with the cursor turned on.
3410  */
3411 #define PREBLINK_TIME 300
3412 #define CURSOR_ON_TIME 800
3413 #define CURSOR_OFF_TIME 400
3414
3415 /*
3416  * preblink!
3417  */
3418
3419 static gint
3420 preblink_cb (gpointer data)
3421 {
3422   GtkTextView *text_view = GTK_TEXT_VIEW (data);
3423
3424   text_view->preblink_timeout = 0;
3425   gtk_text_view_start_cursor_blink (text_view, FALSE);
3426
3427   /* Remove ourselves */
3428   return FALSE;
3429 }
3430
3431 /*
3432  * Blink!
3433  */
3434
3435 static gint
3436 blink_cb (gpointer data)
3437 {
3438   GtkTextView *text_view = GTK_TEXT_VIEW (data);
3439   gboolean visible;
3440
3441   g_assert (text_view->layout);
3442   g_assert (GTK_WIDGET_HAS_FOCUS (text_view));
3443   g_assert (text_view->cursor_visible);
3444
3445   visible = gtk_text_layout_get_cursor_visible (text_view->layout);
3446
3447   if (visible)
3448     text_view->blink_timeout = gtk_timeout_add (CURSOR_OFF_TIME,
3449                                                 blink_cb,
3450                                                 text_view);
3451   else
3452     text_view->blink_timeout = gtk_timeout_add (CURSOR_ON_TIME,
3453                                                 blink_cb,
3454                                                 text_view);
3455
3456   gtk_text_layout_set_cursor_visible (text_view->layout,
3457                                       !visible);
3458
3459   /* Remove ourselves */
3460   return FALSE;
3461 }
3462
3463 static void
3464 gtk_text_view_start_cursor_blink(GtkTextView *text_view,
3465                                  gboolean     with_delay)
3466 {
3467 #ifdef DEBUG_VALIDATION_AND_SCROLLING
3468   return;
3469 #endif
3470
3471   if (text_view->layout == NULL)
3472     return;
3473
3474   if (!text_view->cursor_visible)
3475     return;
3476
3477   if (!GTK_WIDGET_HAS_FOCUS (text_view))
3478     return;
3479
3480   if (text_view->preblink_timeout != 0)
3481     {
3482       gtk_timeout_remove (text_view->preblink_timeout);
3483       text_view->preblink_timeout = 0;
3484     }
3485
3486   if (with_delay)
3487     {
3488       if (text_view->blink_timeout != 0)
3489         {
3490           gtk_timeout_remove (text_view->blink_timeout);
3491           text_view->blink_timeout = 0;
3492         }
3493
3494       gtk_text_layout_set_cursor_visible (text_view->layout, TRUE);
3495
3496       text_view->preblink_timeout = gtk_timeout_add (PREBLINK_TIME,
3497                                                      preblink_cb,
3498                                                      text_view);
3499     }
3500   else
3501     {
3502       if (text_view->blink_timeout == 0)
3503         {
3504           gtk_text_layout_set_cursor_visible (text_view->layout, TRUE);
3505
3506           text_view->blink_timeout = gtk_timeout_add (CURSOR_ON_TIME,
3507                                                       blink_cb,
3508                                                       text_view);
3509         }
3510     }
3511 }
3512
3513 static void
3514 gtk_text_view_stop_cursor_blink (GtkTextView *text_view)
3515 {
3516   if (text_view->preblink_timeout)
3517     {
3518       gtk_timeout_remove (text_view->preblink_timeout);
3519       text_view->preblink_timeout = 0;
3520     }
3521
3522   if (text_view->blink_timeout)
3523     {
3524       gtk_timeout_remove (text_view->blink_timeout);
3525       text_view->blink_timeout = 0;
3526     }
3527 }
3528
3529 /*
3530  * Key binding handlers
3531  */
3532
3533 static void
3534 gtk_text_view_move_iter_by_lines (GtkTextView *text_view,
3535                                   GtkTextIter *newplace,
3536                                   gint         count)
3537 {
3538   while (count < 0)
3539     {
3540       gtk_text_layout_move_iter_to_previous_line (text_view->layout, newplace);
3541       count++;
3542     }
3543
3544   while (count > 0)
3545     {
3546       gtk_text_layout_move_iter_to_next_line (text_view->layout, newplace);
3547       count--;
3548     }
3549 }
3550
3551 static void
3552 gtk_text_view_move_cursor (GtkTextView     *text_view,
3553                            GtkMovementStep  step,
3554                            gint             count,
3555                            gboolean         extend_selection)
3556 {
3557   GtkTextIter insert;
3558   GtkTextIter newplace;
3559
3560   gint cursor_x_pos = 0;
3561
3562   gtk_text_view_reset_im_context (text_view);
3563
3564   if (step == GTK_MOVEMENT_PAGES)
3565     {
3566       gtk_text_view_scroll_pages (text_view, count);
3567       gtk_text_view_start_cursor_blink (text_view, TRUE);
3568       return;
3569     }
3570
3571   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
3572                                     gtk_text_buffer_get_mark (get_buffer (text_view),
3573                                                               "insert"));
3574   newplace = insert;
3575
3576   if (step == GTK_MOVEMENT_DISPLAY_LINES)
3577     gtk_text_view_get_virtual_cursor_pos (text_view, &cursor_x_pos, NULL);
3578
3579   switch (step)
3580     {
3581     case GTK_MOVEMENT_LOGICAL_POSITIONS:
3582       gtk_text_iter_forward_cursor_positions (&newplace, count);
3583       break;
3584
3585     case GTK_MOVEMENT_VISUAL_POSITIONS:
3586       gtk_text_layout_move_iter_visually (text_view->layout,
3587                                           &newplace, count);
3588       break;
3589
3590     case GTK_MOVEMENT_WORDS:
3591       if (count < 0)
3592         gtk_text_iter_backward_word_starts (&newplace, -count);
3593       else if (count > 0)
3594         gtk_text_iter_forward_word_ends (&newplace, count);
3595       break;
3596
3597     case GTK_MOVEMENT_DISPLAY_LINES:
3598       gtk_text_view_move_iter_by_lines (text_view, &newplace, count);
3599       gtk_text_layout_move_iter_to_x (text_view->layout, &newplace, cursor_x_pos);
3600       break;
3601
3602     case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
3603       if (count > 1)
3604         gtk_text_view_move_iter_by_lines (text_view, &newplace, --count);
3605       else if (count < -1)
3606         gtk_text_view_move_iter_by_lines (text_view, &newplace, ++count);
3607
3608       if (count != 0)
3609         gtk_text_layout_move_iter_to_line_end (text_view->layout, &newplace, count);
3610       break;
3611
3612     case GTK_MOVEMENT_PARAGRAPHS:
3613       /* This should almost certainly instead be doing the parallel thing to WORD */
3614       /*       gtk_text_iter_down_lines (&newplace, count); */
3615       /* FIXME */
3616       break;
3617
3618     case GTK_MOVEMENT_PARAGRAPH_ENDS:
3619       if (count > 0)
3620         gtk_text_iter_forward_to_line_end (&newplace);
3621       else if (count < 0)
3622         gtk_text_iter_set_line_offset (&newplace, 0);
3623       break;
3624
3625     case GTK_MOVEMENT_BUFFER_ENDS:
3626       if (count > 0)
3627         gtk_text_buffer_get_end_iter (get_buffer (text_view), &newplace);
3628       else if (count < 0)
3629         gtk_text_buffer_get_iter_at_offset (get_buffer (text_view), &newplace, 0);
3630       break;
3631
3632     default:
3633       break;
3634     }
3635
3636   if (!gtk_text_iter_equal (&insert, &newplace))
3637     {
3638       if (extend_selection)
3639         gtk_text_buffer_move_mark (get_buffer (text_view),
3640                                    gtk_text_buffer_get_mark (get_buffer (text_view),
3641                                                              "insert"),
3642                                    &newplace);
3643       else
3644         gtk_text_buffer_place_cursor (get_buffer (text_view), &newplace);
3645
3646       gtk_text_view_scroll_mark_onscreen (text_view,
3647                                           gtk_text_buffer_get_mark (get_buffer (text_view),
3648                                                                     "insert"));
3649
3650       if (step == GTK_MOVEMENT_DISPLAY_LINES)
3651         {
3652           gtk_text_view_set_virtual_cursor_pos (text_view, cursor_x_pos, -1);
3653         }
3654     }
3655
3656   gtk_text_view_start_cursor_blink (text_view, TRUE);
3657 }
3658
3659 static void
3660 gtk_text_view_set_anchor (GtkTextView *text_view)
3661 {
3662   GtkTextIter insert;
3663
3664   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
3665                                     gtk_text_buffer_get_mark (get_buffer (text_view),
3666                                                               "insert"));
3667
3668   gtk_text_buffer_create_mark (get_buffer (text_view), "anchor", &insert, TRUE);
3669 }
3670
3671 static void
3672 gtk_text_view_scroll_pages (GtkTextView *text_view,
3673                             gint         count)
3674 {
3675   gdouble newval;
3676   GtkAdjustment *adj;
3677   gint cursor_x_pos, cursor_y_pos;
3678   GtkTextIter new_insert;
3679   GtkTextIter anchor;
3680   gint y0, y1;
3681
3682   g_return_if_fail (text_view->vadjustment != NULL);
3683
3684   adj = text_view->vadjustment;
3685
3686   /* Validate the region that will be brought into view by the cursor motion
3687    */
3688   if (count < 0)
3689     {
3690       gtk_text_view_get_first_para_iter (text_view, &anchor);
3691       y0 = adj->page_size;
3692       y1 = adj->page_size + count * adj->page_increment;
3693     }
3694   else
3695     {
3696       gtk_text_view_get_first_para_iter (text_view, &anchor);
3697       y0 = count * adj->page_increment + adj->page_size;
3698       y1 = 0;
3699     }
3700
3701   gtk_text_layout_validate_yrange (text_view->layout, &anchor, y0, y1);
3702
3703   gtk_text_view_get_virtual_cursor_pos (text_view, &cursor_x_pos, &cursor_y_pos);
3704
3705   newval = adj->value;
3706
3707   newval += count * adj->page_increment;
3708
3709   cursor_y_pos += newval - adj->value;
3710   set_adjustment_clamped (adj, newval);
3711
3712   gtk_text_layout_get_iter_at_pixel (text_view->layout, &new_insert, cursor_x_pos, cursor_y_pos);
3713   clamp_iter_onscreen (text_view, &new_insert);
3714   gtk_text_buffer_place_cursor (get_buffer (text_view), &new_insert);
3715
3716   gtk_text_view_set_virtual_cursor_pos (text_view, cursor_x_pos, cursor_y_pos);
3717
3718   /* Adjust to have the cursor _entirely_ onscreen, move_mark_onscreen
3719    * only guarantees 1 pixel onscreen.
3720    */
3721   gtk_text_view_scroll_mark_onscreen (text_view,
3722                                       gtk_text_buffer_get_mark (get_buffer (text_view),
3723                                                                 "insert"));
3724 }
3725
3726 static gboolean
3727 whitespace (gunichar ch, gpointer user_data)
3728 {
3729   return (ch == ' ' || ch == '\t');
3730 }
3731
3732 static gboolean
3733 not_whitespace (gunichar ch, gpointer user_data)
3734 {
3735   return !whitespace (ch, user_data);
3736 }
3737
3738 static gboolean
3739 find_whitepace_region (const GtkTextIter *center,
3740                        GtkTextIter *start, GtkTextIter *end)
3741 {
3742   *start = *center;
3743   *end = *center;
3744
3745   if (gtk_text_iter_backward_find_char (start, not_whitespace, NULL, NULL))
3746     gtk_text_iter_forward_char (start); /* we want the first whitespace... */
3747   if (whitespace (gtk_text_iter_get_char (end), NULL))
3748     gtk_text_iter_forward_find_char (end, not_whitespace, NULL, NULL);
3749
3750   return !gtk_text_iter_equal (start, end);
3751 }
3752
3753 static void
3754 gtk_text_view_insert_at_cursor (GtkTextView *text_view,
3755                                 const gchar *str)
3756 {
3757   gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), str, -1,
3758                                                 text_view->editable);
3759 }
3760
3761 static void
3762 gtk_text_view_delete_from_cursor (GtkTextView   *text_view,
3763                                   GtkDeleteType  type,
3764                                   gint           count)
3765 {
3766   GtkTextIter insert;
3767   GtkTextIter start;
3768   GtkTextIter end;
3769   gboolean leave_one = FALSE;
3770
3771   gtk_text_view_reset_im_context (text_view);
3772
3773   if (type == GTK_DELETE_CHARS)
3774     {
3775       /* Char delete deletes the selection, if one exists */
3776       if (gtk_text_buffer_delete_selection (get_buffer (text_view), TRUE,
3777                                             text_view->editable))
3778         return;
3779     }
3780
3781   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
3782                                     &insert,
3783                                     gtk_text_buffer_get_mark (get_buffer (text_view),
3784                                                               "insert"));
3785
3786   start = insert;
3787   end = insert;
3788
3789   switch (type)
3790     {
3791     case GTK_DELETE_CHARS:
3792       gtk_text_iter_forward_cursor_positions (&end, count);
3793       break;
3794
3795     case GTK_DELETE_WORD_ENDS:
3796       if (count > 0)
3797         gtk_text_iter_forward_word_ends (&end, count);
3798       else if (count < 0)
3799         gtk_text_iter_backward_word_starts (&start, 0 - count);
3800       break;
3801
3802     case GTK_DELETE_WORDS:
3803       break;
3804
3805     case GTK_DELETE_DISPLAY_LINE_ENDS:
3806       break;
3807
3808     case GTK_DELETE_DISPLAY_LINES:
3809       break;
3810
3811     case GTK_DELETE_PARAGRAPH_ENDS:
3812       /* If we're already at a newline, we need to
3813        * simply delete that newline, instead of
3814        * moving to the next one.
3815        */
3816       if (gtk_text_iter_ends_line (&end))
3817         {
3818           gtk_text_iter_forward_line (&end);
3819           --count;
3820         }
3821
3822       while (count > 0)
3823         {
3824           if (!gtk_text_iter_forward_to_line_end (&end))
3825             break;
3826
3827           --count;
3828         }
3829
3830       /* FIXME figure out what a negative count means
3831          and support that */
3832       break;
3833
3834     case GTK_DELETE_PARAGRAPHS:
3835       if (count > 0)
3836         {
3837           gtk_text_iter_set_line_offset (&start, 0);
3838           gtk_text_iter_forward_to_line_end (&end);
3839
3840           /* Do the lines beyond the first. */
3841           while (count > 1)
3842             {
3843               gtk_text_iter_forward_to_line_end (&end);
3844
3845               --count;
3846             }
3847         }
3848
3849       /* FIXME negative count? */
3850
3851       break;
3852
3853     case GTK_DELETE_WHITESPACE:
3854       {
3855         find_whitepace_region (&insert, &start, &end);
3856       }
3857       break;
3858
3859     default:
3860       break;
3861     }
3862
3863   if (!gtk_text_iter_equal (&start, &end))
3864     {
3865       gtk_text_buffer_begin_user_action (get_buffer (text_view));
3866
3867       if (gtk_text_buffer_delete_interactive (get_buffer (text_view), &start, &end,
3868                                               text_view->editable))
3869         {
3870           if (leave_one)
3871             gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view),
3872                                                           " ", 1,
3873                                                           text_view->editable);
3874         }
3875
3876       gtk_text_buffer_end_user_action (get_buffer (text_view));
3877
3878       gtk_text_view_scroll_mark_onscreen (text_view,
3879                                           gtk_text_buffer_get_mark (get_buffer (text_view), "insert"));
3880     }
3881 }
3882
3883 static void
3884 gtk_text_view_cut_clipboard (GtkTextView *text_view)
3885 {
3886   gtk_text_buffer_cut_clipboard (get_buffer (text_view), text_view->editable);
3887   gtk_text_view_scroll_mark_onscreen (text_view,
3888                                       gtk_text_buffer_get_mark (get_buffer (text_view),
3889                                                                 "insert"));
3890 }
3891
3892 static void
3893 gtk_text_view_copy_clipboard (GtkTextView *text_view)
3894 {
3895   gtk_text_buffer_copy_clipboard (get_buffer (text_view));
3896   gtk_text_view_scroll_mark_onscreen (text_view,
3897                                       gtk_text_buffer_get_mark (get_buffer (text_view),
3898                                                                 "insert"));
3899 }
3900
3901 static void
3902 gtk_text_view_paste_clipboard (GtkTextView *text_view)
3903 {
3904   gtk_text_buffer_paste_clipboard (get_buffer (text_view), text_view->editable);
3905   gtk_text_view_scroll_mark_onscreen (text_view,
3906                                       gtk_text_buffer_get_mark (get_buffer (text_view),
3907                                                                 "insert"));
3908 }
3909
3910 static void
3911 gtk_text_view_toggle_overwrite (GtkTextView *text_view)
3912 {
3913   text_view->overwrite_mode = !text_view->overwrite_mode;
3914 }
3915
3916 /*
3917  * Selections
3918  */
3919
3920 static void
3921 gtk_text_view_unselect (GtkTextView *text_view)
3922 {
3923   GtkTextIter insert;
3924
3925   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
3926                                     &insert,
3927                                     gtk_text_buffer_get_mark (get_buffer (text_view),
3928                                                               "insert"));
3929
3930   gtk_text_buffer_move_mark (get_buffer (text_view),
3931                              gtk_text_buffer_get_mark (get_buffer (text_view),
3932                                                        "selection_bound"),
3933                              &insert);
3934 }
3935
3936 static void
3937 move_mark_to_pointer_and_scroll (GtkTextView *text_view,
3938                                  const gchar *mark_name)
3939 {
3940   gint x, y;
3941   GdkModifierType state;
3942   GtkTextIter newplace;
3943
3944   gdk_window_get_pointer (text_view->text_window->bin_window,
3945                           &x, &y, &state);
3946
3947   gtk_text_layout_get_iter_at_pixel (text_view->layout,
3948                                      &newplace,
3949                                      x + text_view->xoffset,
3950                                      y + text_view->yoffset);
3951
3952   {
3953     GtkTextMark *mark =
3954       gtk_text_buffer_get_mark (get_buffer (text_view), mark_name);
3955
3956     gtk_text_buffer_move_mark (get_buffer (text_view),
3957                                mark,
3958                                &newplace);
3959
3960     gtk_text_view_scroll_mark_onscreen (text_view, mark);
3961   }
3962 }
3963
3964 static gint
3965 selection_scan_timeout (gpointer data)
3966 {
3967   GtkTextView *text_view;
3968
3969   text_view = GTK_TEXT_VIEW (data);
3970
3971   move_mark_to_pointer_and_scroll (text_view, "insert");
3972
3973   return TRUE; /* remain installed. */
3974 }
3975
3976 #define DND_SCROLL_MARGIN 0.20
3977
3978 static gint
3979 drag_scan_timeout (gpointer data)
3980 {
3981   GtkTextView *text_view;
3982   gint x, y;
3983   GdkModifierType state;
3984   GtkTextIter newplace;
3985
3986   text_view = GTK_TEXT_VIEW (data);
3987
3988   gdk_window_get_pointer (text_view->text_window->bin_window,
3989                           &x, &y, &state);
3990
3991   gtk_text_layout_get_iter_at_pixel (text_view->layout,
3992                                      &newplace,
3993                                      x + text_view->xoffset,
3994                                      y + text_view->yoffset);
3995
3996   gtk_text_buffer_move_mark (get_buffer (text_view),
3997                              text_view->dnd_mark,
3998                              &newplace);
3999
4000   gtk_text_view_scroll_to_mark (text_view,
4001                                 text_view->dnd_mark,
4002                                 DND_SCROLL_MARGIN, FALSE, 0.0, 0.0);
4003
4004   return TRUE;
4005 }
4006
4007 static gint
4008 selection_motion_event_handler (GtkTextView *text_view, GdkEventMotion *event, gpointer data)
4009 {
4010   move_mark_to_pointer_and_scroll (text_view, "insert");
4011
4012   /* If we had to scroll offscreen, insert a timeout to do so
4013    * again. Note that in the timeout, even if the mouse doesn't
4014    * move, due to this scroll xoffset/yoffset will have changed
4015    * and we'll need to scroll again.
4016    */
4017   if (text_view->scroll_timeout != 0) /* reset on every motion event */
4018     gtk_timeout_remove (text_view->scroll_timeout);
4019
4020   text_view->scroll_timeout =
4021     gtk_timeout_add (50, selection_scan_timeout, text_view);
4022
4023   return TRUE;
4024 }
4025
4026 static void
4027 gtk_text_view_start_selection_drag (GtkTextView       *text_view,
4028                                     const GtkTextIter *iter,
4029                                     GdkEventButton    *button)
4030 {
4031   GtkTextIter newplace;
4032
4033   g_return_if_fail (text_view->selection_drag_handler == 0);
4034
4035   gtk_grab_add (GTK_WIDGET (text_view));
4036
4037   newplace = *iter;
4038
4039   gtk_text_buffer_place_cursor (get_buffer (text_view), &newplace);
4040
4041   text_view->selection_drag_handler = gtk_signal_connect (GTK_OBJECT (text_view),
4042                                                           "motion_notify_event",
4043                                                           GTK_SIGNAL_FUNC (selection_motion_event_handler),
4044                                                           NULL);
4045 }
4046
4047 /* returns whether we were really dragging */
4048 static gboolean
4049 gtk_text_view_end_selection_drag (GtkTextView *text_view, GdkEventButton *event)
4050 {
4051   if (text_view->selection_drag_handler == 0)
4052     return FALSE;
4053
4054   gtk_signal_disconnect (GTK_OBJECT (text_view), text_view->selection_drag_handler);
4055   text_view->selection_drag_handler = 0;
4056
4057   if (text_view->scroll_timeout != 0)
4058     {
4059       gtk_timeout_remove (text_view->scroll_timeout);
4060       text_view->scroll_timeout = 0;
4061     }
4062
4063   /* one last update to current position */
4064   move_mark_to_pointer_and_scroll (text_view, "insert");
4065
4066   gtk_grab_remove (GTK_WIDGET (text_view));
4067
4068   return TRUE;
4069 }
4070
4071 /*
4072  * Layout utils
4073  */
4074
4075 static void
4076 gtk_text_view_set_attributes_from_style (GtkTextView        *text_view,
4077                                          GtkTextAttributes *values,
4078                                          GtkStyle           *style)
4079 {
4080   values->appearance.bg_color = style->base[GTK_STATE_NORMAL];
4081   values->appearance.fg_color = style->fg[GTK_STATE_NORMAL];
4082
4083   if (values->font.family_name)
4084     g_free (values->font.family_name);
4085
4086   values->font = *style->font_desc;
4087   values->font.family_name = g_strdup (style->font_desc->family_name);
4088 }
4089
4090 static void
4091 gtk_text_view_ensure_layout (GtkTextView *text_view)
4092 {
4093   GtkWidget *widget;
4094
4095   widget = GTK_WIDGET (text_view);
4096
4097   if (text_view->layout == NULL)
4098     {
4099       GtkTextAttributes *style;
4100       PangoContext *ltr_context, *rtl_context;
4101       GSList *tmp_list;
4102
4103       DV(g_print(G_STRLOC"\n"));
4104
4105       text_view->layout = gtk_text_layout_new ();
4106
4107       g_signal_connect_data (G_OBJECT (text_view->layout),
4108                              "invalidated",
4109                              invalidated_handler,
4110                              text_view,
4111                              NULL, FALSE, FALSE);
4112
4113       g_signal_connect_data (G_OBJECT (text_view->layout),
4114                              "changed",
4115                              changed_handler,
4116                              text_view,
4117                              NULL, FALSE, FALSE);
4118
4119       g_signal_connect_data (G_OBJECT (text_view->layout),
4120                              "allocate_child",
4121                              gtk_text_view_child_allocated,
4122                              text_view,
4123                              NULL, FALSE, FALSE);
4124
4125       if (get_buffer (text_view))
4126         gtk_text_layout_set_buffer (text_view->layout, get_buffer (text_view));
4127
4128       if ((GTK_WIDGET_HAS_FOCUS (text_view) && text_view->cursor_visible))
4129         gtk_text_view_start_cursor_blink (text_view, FALSE);
4130       else
4131         gtk_text_layout_set_cursor_visible (text_view->layout, FALSE);
4132
4133       ltr_context = gtk_widget_create_pango_context (GTK_WIDGET (text_view));
4134       pango_context_set_base_dir (ltr_context, PANGO_DIRECTION_LTR);
4135       rtl_context = gtk_widget_create_pango_context (GTK_WIDGET (text_view));
4136       pango_context_set_base_dir (rtl_context, PANGO_DIRECTION_RTL);
4137
4138       gtk_text_layout_set_contexts (text_view->layout, ltr_context, rtl_context);
4139
4140       g_object_unref (G_OBJECT (ltr_context));
4141       g_object_unref (G_OBJECT (rtl_context));
4142
4143       style = gtk_text_attributes_new ();
4144
4145       gtk_widget_ensure_style (widget);
4146       gtk_text_view_set_attributes_from_style (text_view,
4147                                                style, widget->style);
4148
4149       style->pixels_above_lines = text_view->pixels_above_lines;
4150       style->pixels_below_lines = text_view->pixels_below_lines;
4151       style->pixels_inside_wrap = text_view->pixels_inside_wrap;
4152       style->left_margin = text_view->left_margin;
4153       style->right_margin = text_view->right_margin;
4154       style->indent = text_view->indent;
4155       style->tabs = text_view->tabs ? pango_tab_array_copy (text_view->tabs) : NULL;
4156
4157       style->wrap_mode = text_view->wrap_mode;
4158       style->justification = text_view->justify;
4159       style->direction = gtk_widget_get_direction (GTK_WIDGET (text_view));
4160
4161       gtk_text_layout_set_default_style (text_view->layout, style);
4162
4163       gtk_text_attributes_unref (style);
4164
4165       /* Set layout for all anchored children */
4166
4167       tmp_list = text_view->children;
4168       while (tmp_list != NULL)
4169         {
4170           GtkTextViewChild *vc = tmp_list->data;
4171
4172           if (vc->anchor)
4173             {
4174               gtk_text_anchored_child_set_layout (vc->widget,
4175                                                   text_view->layout);
4176               /* vc may now be invalid! */
4177             }
4178
4179           tmp_list = g_slist_next (tmp_list);
4180         }
4181     }
4182 }
4183
4184 static void
4185 gtk_text_view_destroy_layout (GtkTextView *text_view)
4186 {
4187   if (text_view->layout)
4188     {
4189       GSList *tmp_list;
4190
4191       if (text_view->incremental_validate_idle)
4192         {
4193           g_source_remove (text_view->incremental_validate_idle);
4194           text_view->incremental_validate_idle = 0;
4195         }
4196
4197       /* Remove layout from all anchored children */
4198
4199       tmp_list = text_view->children;
4200       while (tmp_list != NULL)
4201         {
4202           GtkTextViewChild *vc = tmp_list->data;
4203
4204           if (vc->anchor)
4205             {
4206               gtk_text_anchored_child_set_layout (vc->widget, NULL);
4207               /* vc may now be invalid! */
4208             }
4209
4210           tmp_list = g_slist_next (tmp_list);
4211         }
4212
4213       gtk_text_view_stop_cursor_blink (text_view);
4214       gtk_text_view_end_selection_drag (text_view, NULL);
4215
4216       g_signal_handlers_disconnect_by_func (G_OBJECT (text_view->layout),
4217                                             invalidated_handler, text_view);
4218       g_signal_handlers_disconnect_by_func (G_OBJECT (text_view->layout),
4219                                             changed_handler, text_view);
4220       g_object_unref (G_OBJECT (text_view->layout));
4221       text_view->layout = NULL;
4222     }
4223 }
4224
4225 static void
4226 gtk_text_view_reset_im_context (GtkTextView *text_view)
4227 {
4228   if (text_view->need_im_reset)
4229     {
4230       text_view->need_im_reset = FALSE;
4231       gtk_im_context_reset (text_view->im_context);
4232     }
4233 }
4234
4235 /*
4236  * DND feature
4237  */
4238
4239 static void
4240 gtk_text_view_start_selection_dnd (GtkTextView       *text_view,
4241                                    const GtkTextIter *iter,
4242                                    GdkEventMotion    *event)
4243 {
4244   GdkDragContext *context;
4245   GtkTargetList *target_list;
4246
4247   text_view->drag_start_x = -1;
4248   text_view->drag_start_y = -1;
4249
4250   target_list = gtk_target_list_new (target_table,
4251                                      G_N_ELEMENTS (target_table));
4252
4253   context = gtk_drag_begin (GTK_WIDGET (text_view), target_list,
4254                             GDK_ACTION_COPY | GDK_ACTION_MOVE,
4255                             1, (GdkEvent*)event);
4256
4257   gtk_target_list_unref (target_list);
4258
4259   gtk_drag_set_icon_default (context);
4260 }
4261
4262 static void
4263 gtk_text_view_drag_begin (GtkWidget        *widget,
4264                           GdkDragContext   *context)
4265 {
4266   /* do nothing */
4267 }
4268
4269 static void
4270 gtk_text_view_drag_end (GtkWidget        *widget,
4271                         GdkDragContext   *context)
4272 {
4273   GtkTextView *text_view;
4274
4275   text_view = GTK_TEXT_VIEW (widget);
4276 }
4277
4278 static void
4279 gtk_text_view_drag_data_get (GtkWidget        *widget,
4280                              GdkDragContext   *context,
4281                              GtkSelectionData *selection_data,
4282                              guint             info,
4283                              guint             time)
4284 {
4285   GtkTextView *text_view;
4286
4287   text_view = GTK_TEXT_VIEW (widget);
4288
4289   if (selection_data->target == gdk_atom_intern ("GTK_TEXT_BUFFER_CONTENTS", FALSE))
4290     {
4291       GtkTextBuffer *buffer = gtk_text_view_get_buffer (text_view);
4292
4293       gtk_selection_data_set (selection_data,
4294                               gdk_atom_intern ("GTK_TEXT_BUFFER_CONTENTS", FALSE),
4295                               8, /* bytes */
4296                               (void*)&buffer,
4297                               sizeof (buffer));
4298     }
4299   else
4300     {
4301       gchar *str;
4302       GtkTextIter start;
4303       GtkTextIter end;
4304
4305       str = NULL;
4306
4307       if (gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
4308                                                 &start, &end))
4309         {
4310           /* Extract the selected text */
4311           str = gtk_text_iter_get_visible_text (&start, &end);
4312         }
4313
4314       if (str)
4315         {
4316           gtk_selection_data_set_text (selection_data, str);
4317           g_free (str);
4318         }
4319     }
4320 }
4321
4322 static void
4323 gtk_text_view_drag_data_delete (GtkWidget        *widget,
4324                                 GdkDragContext   *context)
4325 {
4326   GtkTextView *text_view;
4327
4328   text_view = GTK_TEXT_VIEW (widget);
4329
4330   gtk_text_buffer_delete_selection (GTK_TEXT_VIEW (widget)->buffer,
4331                                     TRUE, GTK_TEXT_VIEW (widget)->editable);
4332 }
4333
4334 static void
4335 gtk_text_view_drag_leave (GtkWidget        *widget,
4336                           GdkDragContext   *context,
4337                           guint             time)
4338 {
4339   GtkTextView *text_view;
4340
4341   text_view = GTK_TEXT_VIEW (widget);
4342
4343   gtk_text_mark_set_visible (text_view->dnd_mark, FALSE);
4344
4345   if (text_view->scroll_timeout != 0)
4346     gtk_timeout_remove (text_view->scroll_timeout);
4347
4348   text_view->scroll_timeout = 0;
4349 }
4350
4351 static gboolean
4352 gtk_text_view_drag_motion (GtkWidget        *widget,
4353                            GdkDragContext   *context,
4354                            gint              x,
4355                            gint              y,
4356                            guint             time)
4357 {
4358   GtkTextIter newplace;
4359   GtkTextView *text_view;
4360   GtkTextIter start;
4361   GtkTextIter end;
4362   GdkRectangle target_rect;
4363   gint bx, by;
4364   GdkDragAction suggested_action = 0;
4365
4366   text_view = GTK_TEXT_VIEW (widget);
4367
4368   target_rect = text_view->text_window->allocation;
4369
4370   if (x < target_rect.x ||
4371       y < target_rect.y ||
4372       x > (target_rect.x + target_rect.width) ||
4373       y > (target_rect.y + target_rect.height))
4374     return FALSE; /* outside the text window, allow parent widgets to handle event */
4375
4376   gtk_text_view_window_to_buffer_coords (text_view,
4377                                          GTK_TEXT_WINDOW_WIDGET,
4378                                          x, y,
4379                                          &bx, &by);
4380
4381   gtk_text_layout_get_iter_at_pixel (text_view->layout,
4382                                      &newplace,
4383                                      bx, by);
4384
4385   if (gtk_drag_dest_find_target (widget, context,
4386                                  gtk_drag_dest_get_target_list (widget)) == GDK_NONE)
4387     {
4388       /* can't accept any of the offered targets */
4389     }
4390   else if (gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
4391                                             &start, &end) &&
4392            gtk_text_iter_in_range (&newplace, &start, &end))
4393     {
4394       /* We're inside the selection. */
4395     }
4396   else
4397     {
4398       if (gtk_text_iter_editable (&newplace, text_view->editable))
4399         {
4400           GtkWidget *source_widget;
4401
4402           suggested_action = context->suggested_action;
4403
4404           source_widget = gtk_drag_get_source_widget (context);
4405
4406           if (source_widget == widget)
4407             {
4408               /* Default to MOVE, unless the user has
4409                * pressed ctrl or alt to affect available actions
4410                */
4411               if ((context->actions & GDK_ACTION_MOVE) != 0)
4412                 suggested_action = GDK_ACTION_MOVE;
4413             }
4414         }
4415       else
4416         {
4417           /* Can't drop here. */
4418         }
4419     }
4420
4421   if (suggested_action != 0)
4422     {
4423       gtk_text_mark_set_visible (text_view->dnd_mark,
4424                                  text_view->cursor_visible);
4425
4426       gdk_drag_status (context, suggested_action, time);
4427     }
4428   else
4429     {
4430       gdk_drag_status (context, 0, time);
4431       gtk_text_mark_set_visible (text_view->dnd_mark, FALSE);
4432     }
4433
4434   gtk_text_buffer_move_mark (get_buffer (text_view),
4435                              text_view->dnd_mark,
4436                              &newplace);
4437
4438   gtk_text_view_scroll_to_mark (text_view,
4439                                 text_view->dnd_mark,
4440                                 DND_SCROLL_MARGIN, FALSE, 0.0, 0.0);
4441
4442   if (text_view->scroll_timeout != 0) /* reset on every motion event */
4443     gtk_timeout_remove (text_view->scroll_timeout);
4444
4445   text_view->scroll_timeout =
4446     gtk_timeout_add (50, drag_scan_timeout, text_view);
4447
4448   /* TRUE return means don't propagate the drag motion to parent
4449    * widgets that may also be drop sites.
4450    */
4451   return TRUE;
4452 }
4453
4454 static gboolean
4455 gtk_text_view_drag_drop (GtkWidget        *widget,
4456                          GdkDragContext   *context,
4457                          gint              x,
4458                          gint              y,
4459                          guint             time)
4460 {
4461   GtkTextView *text_view;
4462
4463   text_view = GTK_TEXT_VIEW (widget);
4464
4465   if (text_view->scroll_timeout != 0)
4466     gtk_timeout_remove (text_view->scroll_timeout);
4467
4468   text_view->scroll_timeout = 0;
4469
4470   gtk_text_mark_set_visible (text_view->dnd_mark, FALSE);
4471
4472   return TRUE;
4473 }
4474
4475 static void
4476 insert_text_data (GtkTextView      *text_view,
4477                   GtkTextIter      *drop_point,
4478                   GtkSelectionData *selection_data)
4479 {
4480   gchar *str;
4481
4482   str = gtk_selection_data_get_text (selection_data);
4483
4484   if (str)
4485     {
4486       gtk_text_buffer_insert_interactive (get_buffer (text_view),
4487                                           drop_point, str, -1,
4488                                           text_view->editable);
4489       g_free (str);
4490     }
4491 }
4492
4493 static void
4494 gtk_text_view_drag_data_received (GtkWidget        *widget,
4495                                   GdkDragContext   *context,
4496                                   gint              x,
4497                                   gint              y,
4498                                   GtkSelectionData *selection_data,
4499                                   guint             info,
4500                                   guint             time)
4501 {
4502   GtkTextIter drop_point;
4503   GtkTextView *text_view;
4504   GtkTextMark *drag_target_mark;
4505
4506   text_view = GTK_TEXT_VIEW (widget);
4507
4508   drag_target_mark = gtk_text_buffer_get_mark (get_buffer (text_view),
4509                                                "gtk_drag_target");
4510
4511   if (drag_target_mark == NULL)
4512     return;
4513
4514   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
4515                                     &drop_point,
4516                                     drag_target_mark);
4517
4518   if (selection_data->target == gdk_atom_intern ("GTK_TEXT_BUFFER_CONTENTS", FALSE))
4519     {
4520       GtkTextBuffer *src_buffer = NULL;
4521       GtkTextIter start, end;
4522       gboolean copy_tags = TRUE;
4523
4524       if (selection_data->length != sizeof (src_buffer))
4525         return;
4526
4527       memcpy (&src_buffer, selection_data->data, sizeof (src_buffer));
4528
4529       if (src_buffer == NULL)
4530         return;
4531
4532       g_return_if_fail (GTK_IS_TEXT_BUFFER (src_buffer));
4533
4534       if (gtk_text_buffer_get_tag_table (src_buffer) !=
4535           gtk_text_buffer_get_tag_table (get_buffer (text_view)))
4536         copy_tags = FALSE;
4537
4538       if (gtk_text_buffer_get_selection_bounds (src_buffer,
4539                                                 &start,
4540                                                 &end))
4541         {
4542           if (copy_tags)
4543             gtk_text_buffer_insert_range_interactive (get_buffer (text_view),
4544                                                       &drop_point,
4545                                                       &start,
4546                                                       &end,
4547                                                       text_view->editable);
4548           else
4549             {
4550               gchar *str;
4551
4552               str = gtk_text_iter_get_visible_text (&start, &end);
4553               gtk_text_buffer_insert_interactive (get_buffer (text_view),
4554                                                   &drop_point, str, -1,
4555                                                   text_view->editable);
4556               g_free (str);
4557             }
4558         }
4559     }
4560   else
4561     insert_text_data (text_view, &drop_point, selection_data);
4562 }
4563
4564 static GtkAdjustment*
4565 get_hadjustment (GtkTextView *text_view)
4566 {
4567   if (text_view->hadjustment == NULL)
4568     gtk_text_view_set_scroll_adjustments (text_view,
4569                                           NULL, /* forces creation */
4570                                           text_view->vadjustment);
4571
4572   return text_view->hadjustment;
4573 }
4574
4575 static GtkAdjustment*
4576 get_vadjustment (GtkTextView *text_view)
4577 {
4578   if (text_view->vadjustment == NULL)
4579     gtk_text_view_set_scroll_adjustments (text_view,
4580                                           text_view->hadjustment,
4581                                           NULL); /* forces creation */
4582   return text_view->vadjustment;
4583 }
4584
4585
4586 static void
4587 gtk_text_view_set_scroll_adjustments (GtkTextView   *text_view,
4588                                       GtkAdjustment *hadj,
4589                                       GtkAdjustment *vadj)
4590 {
4591   gboolean need_adjust = FALSE;
4592
4593   g_return_if_fail (text_view != NULL);
4594   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
4595
4596   if (hadj)
4597     g_return_if_fail (GTK_IS_ADJUSTMENT (hadj));
4598   else
4599     hadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
4600   if (vadj)
4601     g_return_if_fail (GTK_IS_ADJUSTMENT (vadj));
4602   else
4603     vadj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
4604
4605   if (text_view->hadjustment && (text_view->hadjustment != hadj))
4606     {
4607       gtk_signal_disconnect_by_data (GTK_OBJECT (text_view->hadjustment), text_view);
4608       g_object_unref (G_OBJECT (text_view->hadjustment));
4609     }
4610
4611   if (text_view->vadjustment && (text_view->vadjustment != vadj))
4612     {
4613       gtk_signal_disconnect_by_data (GTK_OBJECT (text_view->vadjustment), text_view);
4614       g_object_unref (G_OBJECT (text_view->vadjustment));
4615     }
4616
4617   if (text_view->hadjustment != hadj)
4618     {
4619       text_view->hadjustment = hadj;
4620       g_object_ref (G_OBJECT (text_view->hadjustment));
4621       gtk_object_sink (GTK_OBJECT (text_view->hadjustment));
4622
4623       gtk_signal_connect (GTK_OBJECT (text_view->hadjustment), "value_changed",
4624                           (GtkSignalFunc) gtk_text_view_value_changed,
4625                           text_view);
4626       need_adjust = TRUE;
4627     }
4628
4629   if (text_view->vadjustment != vadj)
4630     {
4631       text_view->vadjustment = vadj;
4632       g_object_ref (G_OBJECT (text_view->vadjustment));
4633       gtk_object_sink (GTK_OBJECT (text_view->vadjustment));
4634
4635       gtk_signal_connect (GTK_OBJECT (text_view->vadjustment), "value_changed",
4636                           (GtkSignalFunc) gtk_text_view_value_changed,
4637                           text_view);
4638       need_adjust = TRUE;
4639     }
4640
4641   if (need_adjust)
4642     gtk_text_view_value_changed (NULL, text_view);
4643 }
4644
4645 static void
4646 gtk_text_view_value_changed (GtkAdjustment *adj,
4647                              GtkTextView   *text_view)
4648 {
4649   GtkTextIter iter;
4650   gint line_top;
4651   gint dx = 0;
4652   gint dy = 0;
4653
4654   text_view->onscreen_validated = FALSE;
4655
4656   DV(g_print(">Scroll offset changed, onscreen_validated = FALSE ("G_STRLOC")\n"));
4657
4658   if (adj == text_view->hadjustment)
4659     {
4660       dx = text_view->xoffset - (gint)adj->value;
4661       text_view->xoffset = adj->value;
4662     }
4663   else if (adj == text_view->vadjustment)
4664     {
4665       dy = text_view->yoffset - (gint)adj->value;
4666       text_view->yoffset = adj->value;
4667
4668       if (text_view->layout)
4669         {
4670           gtk_text_layout_get_line_at_y (text_view->layout, &iter, adj->value, &line_top);
4671
4672           gtk_text_buffer_move_mark (get_buffer (text_view), text_view->first_para_mark, &iter);
4673
4674           text_view->first_para_pixels = adj->value - line_top;
4675         }
4676     }
4677
4678   if (GTK_WIDGET_REALIZED (text_view) && (dx != 0 || dy != 0))
4679     {
4680       if (dy != 0)
4681         {
4682           if (text_view->left_window)
4683             text_window_scroll (text_view->left_window, 0, dy);
4684           if (text_view->right_window)
4685             text_window_scroll (text_view->right_window, 0, dy);
4686         }
4687
4688       if (dx != 0)
4689         {
4690           if (text_view->top_window)
4691             text_window_scroll (text_view->top_window, dx, 0);
4692           if (text_view->bottom_window)
4693             text_window_scroll (text_view->bottom_window, dx, 0);
4694         }
4695
4696       /* It looks nicer to scroll the main area last, because
4697        * it takes a while, and making the side areas update
4698        * afterward emphasizes the slowness of scrolling the
4699        * main area.
4700        */
4701       text_window_scroll (text_view->text_window, dx, dy);
4702     }
4703
4704   /* This could result in invalidation, which would install the
4705    * first_validate_idle, which would validate onscreen;
4706    * but we're going to go ahead and validate here, so
4707    * first_validate_idle shouldn't have anything to do.
4708    */
4709   gtk_text_view_update_layout_width (text_view);
4710
4711   /* note that validation of onscreen could invoke this function
4712    * recursively, by scrolling to maintain first_para, or in response
4713    * to updating the layout width, however there is no problem with
4714    * that, or shouldn't be.
4715    */
4716   gtk_text_view_validate_onscreen (text_view);
4717
4718   /* process exposes */
4719   if (GTK_WIDGET_REALIZED (text_view))
4720     {
4721       if (text_view->left_window)
4722         gdk_window_process_updates (text_view->left_window->bin_window, TRUE);
4723
4724       if (text_view->right_window)
4725         gdk_window_process_updates (text_view->right_window->bin_window, TRUE);
4726
4727       if (text_view->top_window)
4728         gdk_window_process_updates (text_view->top_window->bin_window, TRUE);
4729
4730       if (text_view->bottom_window)
4731         gdk_window_process_updates (text_view->bottom_window->bin_window, TRUE);
4732
4733       gdk_window_process_updates (text_view->text_window->bin_window, TRUE);
4734     }
4735
4736   /* If this got installed, get rid of it, it's just a waste of time. */
4737   if (text_view->first_validate_idle != 0)
4738     {
4739       g_source_remove (text_view->first_validate_idle);
4740       text_view->first_validate_idle = 0;
4741     }
4742
4743   DV(g_print(">End scroll offset changed handler ("G_STRLOC")\n"));
4744 }
4745
4746 static void
4747 gtk_text_view_commit_handler (GtkIMContext  *context,
4748                               const gchar   *str,
4749                               GtkTextView   *text_view)
4750 {
4751   gtk_text_buffer_begin_user_action (get_buffer (text_view));
4752
4753   gtk_text_buffer_delete_selection (get_buffer (text_view), TRUE,
4754                                     text_view->editable);
4755
4756   if (!strcmp (str, "\n"))
4757     {
4758       gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), "\n", 1,
4759                                                     text_view->editable);
4760     }
4761   else
4762     {
4763       if (text_view->overwrite_mode)
4764         gtk_text_view_delete_from_cursor (text_view, GTK_DELETE_CHARS, 1);
4765       gtk_text_buffer_insert_interactive_at_cursor (get_buffer (text_view), str, -1,
4766                                                     text_view->editable);
4767     }
4768
4769   gtk_text_buffer_end_user_action (get_buffer (text_view));
4770
4771   gtk_text_view_scroll_mark_onscreen (text_view,
4772                                       gtk_text_buffer_get_mark (get_buffer (text_view),
4773                                                                 "insert"));
4774 }
4775
4776 static void
4777 gtk_text_view_preedit_changed_handler (GtkIMContext *context,
4778                                        GtkTextView  *text_view)
4779 {
4780   gchar *str;
4781   PangoAttrList *attrs;
4782   gint cursor_pos;
4783
4784   gtk_im_context_get_preedit_string (context, &str, &attrs, &cursor_pos);
4785   gtk_text_layout_set_preedit_string (text_view->layout, str, attrs, cursor_pos);
4786
4787   pango_attr_list_unref (attrs);
4788   g_free (str);
4789 }
4790
4791 static void
4792 gtk_text_view_mark_set_handler (GtkTextBuffer     *buffer,
4793                                 const GtkTextIter *location,
4794                                 GtkTextMark       *mark,
4795                                 gpointer           data)
4796 {
4797   GtkTextView *text_view = GTK_TEXT_VIEW (data);
4798   gboolean need_reset = FALSE;
4799
4800   if (mark == gtk_text_buffer_get_insert (buffer))
4801     {
4802       text_view->virtual_cursor_x = -1;
4803       text_view->virtual_cursor_y = -1;
4804       need_reset = TRUE;
4805     }
4806   else if (mark == gtk_text_buffer_get_selection_bound (buffer))
4807     {
4808       need_reset = TRUE;
4809     }
4810
4811   if (need_reset)
4812     gtk_text_view_reset_im_context (text_view);
4813 }
4814
4815 static void
4816 gtk_text_view_get_virtual_cursor_pos (GtkTextView *text_view,
4817                                       gint        *x,
4818                                       gint        *y)
4819 {
4820   GdkRectangle strong_pos;
4821   GtkTextIter insert;
4822
4823   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
4824                                     gtk_text_buffer_get_mark (get_buffer (text_view),
4825                                                               "insert"));
4826
4827   if ((x && text_view->virtual_cursor_x == -1) ||
4828       (y && text_view->virtual_cursor_y == -1))
4829     gtk_text_layout_get_cursor_locations (text_view->layout, &insert, &strong_pos, NULL);
4830
4831   if (x)
4832     {
4833       if (text_view->virtual_cursor_x != -1)
4834         *x = text_view->virtual_cursor_x;
4835       else
4836         *x = strong_pos.x;
4837     }
4838
4839   if (y)
4840     {
4841       if (text_view->virtual_cursor_x != -1)
4842         *y = text_view->virtual_cursor_y;
4843       else
4844         *y = strong_pos.y + strong_pos.height / 2;
4845     }
4846 }
4847
4848 static void
4849 gtk_text_view_set_virtual_cursor_pos (GtkTextView *text_view,
4850                                       gint         x,
4851                                       gint         y)
4852 {
4853   GdkRectangle strong_pos;
4854   GtkTextIter insert;
4855
4856   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &insert,
4857                                     gtk_text_buffer_get_mark (get_buffer (text_view),
4858                                                               "insert"));
4859
4860   if (x == -1 || y == -1)
4861     gtk_text_layout_get_cursor_locations (text_view->layout, &insert, &strong_pos, NULL);
4862
4863   text_view->virtual_cursor_x = (x == -1) ? strong_pos.x : x;
4864   text_view->virtual_cursor_y = (y == -1) ? strong_pos.y + strong_pos.height / 2 : y;
4865 }
4866
4867 /* Quick hack of a popup menu
4868  */
4869 static void
4870 activate_cb (GtkWidget   *menuitem,
4871              GtkTextView *text_view)
4872 {
4873   const gchar *signal = g_object_get_data (G_OBJECT (menuitem), "gtk-signal");
4874   gtk_signal_emit_by_name (GTK_OBJECT (text_view), signal);
4875 }
4876
4877 static void
4878 append_action_signal (GtkTextView  *text_view,
4879                       GtkWidget    *menu,
4880                       const gchar  *label,
4881                       const gchar  *signal,
4882                       gboolean      sensitive)
4883 {
4884   GtkWidget *menuitem = gtk_menu_item_new_with_label (label);
4885
4886   g_object_set_data (G_OBJECT (menuitem), "gtk-signal", (char *)signal);
4887   gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
4888                       GTK_SIGNAL_FUNC (activate_cb), text_view);
4889
4890   gtk_widget_set_sensitive (menuitem, sensitive);
4891
4892   gtk_widget_show (menuitem);
4893   gtk_menu_shell_append (GTK_MENU_SHELL (menu), menuitem);
4894 }
4895
4896 static void
4897 popup_menu_detach (GtkWidget *attach_widget,
4898                    GtkMenu   *menu)
4899 {
4900   GTK_TEXT_VIEW (attach_widget)->popup_menu = NULL;
4901 }
4902
4903 static void
4904 popup_position_func (GtkMenu   *menu,
4905                      gint      *x,
4906                      gint      *y,
4907                      gboolean  *push_in,
4908                      gpointer   user_data)
4909 {
4910   GtkTextView *text_view;
4911   GtkWidget *widget;
4912   GdkRectangle cursor_rect;
4913   GdkRectangle onscreen_rect;
4914   gint root_x, root_y;
4915   GtkTextIter iter;
4916   GtkRequisition req;
4917
4918   text_view = GTK_TEXT_VIEW (user_data);
4919   widget = GTK_WIDGET (text_view);
4920
4921   g_return_if_fail (GTK_WIDGET_REALIZED (text_view));
4922
4923   gdk_window_get_origin (widget->window, &root_x, &root_y);
4924
4925   gtk_text_buffer_get_iter_at_mark (get_buffer (text_view),
4926                                     &iter,
4927                                     gtk_text_buffer_get_insert (get_buffer (text_view)));
4928
4929   gtk_text_view_get_iter_location (text_view,
4930                                    &iter,
4931                                    &cursor_rect);
4932
4933   gtk_text_view_get_visible_rect (text_view, &onscreen_rect);
4934
4935   gtk_widget_size_request (text_view->popup_menu, &req);
4936
4937   /* can't use rectangle_intersect since cursor rect can have 0 width */
4938   if (cursor_rect.x >= onscreen_rect.x &&
4939       cursor_rect.x < onscreen_rect.x + onscreen_rect.width &&
4940       cursor_rect.y >= onscreen_rect.y &&
4941       cursor_rect.y < onscreen_rect.y + onscreen_rect.height)
4942     {
4943       gtk_text_view_buffer_to_window_coords (text_view,
4944                                              GTK_TEXT_WINDOW_WIDGET,
4945                                              cursor_rect.x, cursor_rect.y,
4946                                              &cursor_rect.x, &cursor_rect.y);
4947
4948       *x = root_x + cursor_rect.x + cursor_rect.width;
4949       *y = root_y + cursor_rect.y + cursor_rect.height;
4950     }
4951   else
4952     {
4953       /* Just center the menu, since cursor is offscreen. */
4954       *x = root_x + (widget->allocation.width / 2 - req.width / 2);
4955       *y = root_y + (widget->allocation.height / 2 - req.height / 2);
4956     }
4957
4958   /* Ensure sanity */
4959   *x = CLAMP (*x, root_x, (root_x + widget->allocation.width));
4960   *y = CLAMP (*y, root_y, (root_y + widget->allocation.height));
4961
4962   *x = CLAMP (*x, 0, MAX (0, gdk_screen_width () - req.width));
4963   *y = CLAMP (*y, 0, MAX (0, gdk_screen_height () - req.height));
4964 }
4965
4966 static void
4967 gtk_text_view_do_popup (GtkTextView    *text_view,
4968                         GdkEventButton *event)
4969 {
4970   GtkWidget *menuitem;
4971   GtkWidget *submenu;
4972   gboolean have_selection;
4973
4974   if (text_view->popup_menu)
4975     gtk_widget_destroy (text_view->popup_menu);
4976
4977   text_view->popup_menu = gtk_menu_new ();
4978
4979   gtk_menu_attach_to_widget (GTK_MENU (text_view->popup_menu),
4980                              GTK_WIDGET (text_view),
4981                              popup_menu_detach);
4982
4983   have_selection = gtk_text_buffer_get_selection_bounds (get_buffer (text_view),
4984                                                          NULL, NULL);
4985
4986   append_action_signal (text_view, text_view->popup_menu, _("Cut"), "cut_clipboard",
4987                         have_selection);
4988   append_action_signal (text_view, text_view->popup_menu, _("Copy"), "copy_clipboard",
4989                         have_selection);
4990   append_action_signal (text_view, text_view->popup_menu, _("Paste"), "paste_clipboard",
4991                         TRUE);
4992
4993   menuitem = gtk_separator_menu_item_new ();
4994   gtk_widget_show (menuitem);
4995   gtk_menu_shell_append (GTK_MENU_SHELL (text_view->popup_menu), menuitem);
4996
4997   menuitem = gtk_menu_item_new_with_label (_("Input Methods"));
4998   gtk_widget_show (menuitem);
4999   submenu = gtk_menu_new ();
5000   gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), submenu);
5001   gtk_menu_shell_append (GTK_MENU_SHELL (text_view->popup_menu), menuitem);
5002
5003   gtk_im_multicontext_append_menuitems (GTK_IM_MULTICONTEXT (text_view->im_context),
5004                                         GTK_MENU_SHELL (submenu));
5005
5006   gtk_signal_emit (GTK_OBJECT (text_view),
5007                    signals[POPULATE_POPUP],
5008                    text_view->popup_menu);
5009
5010   if (event)
5011     gtk_menu_popup (GTK_MENU (text_view->popup_menu), NULL, NULL,
5012                     NULL, NULL,
5013                     event->button, event->time);
5014   else
5015     gtk_menu_popup (GTK_MENU (text_view->popup_menu), NULL, NULL,
5016                     popup_position_func, text_view,
5017                     0, gtk_get_current_event_time ());
5018 }
5019
5020 static void
5021 gtk_text_view_popup_menu (GtkWidget *widget)
5022 {
5023   gtk_text_view_do_popup (GTK_TEXT_VIEW (widget), NULL);
5024 }
5025
5026 /* Child GdkWindows */
5027
5028
5029 static GtkTextWindow*
5030 text_window_new (GtkTextWindowType  type,
5031                  GtkWidget         *widget,
5032                  gint               width_request,
5033                  gint               height_request)
5034 {
5035   GtkTextWindow *win;
5036
5037   win = g_new (GtkTextWindow, 1);
5038
5039   win->type = type;
5040   win->widget = widget;
5041   win->window = NULL;
5042   win->bin_window = NULL;
5043   win->requisition.width = width_request;
5044   win->requisition.height = height_request;
5045   win->allocation.width = width_request;
5046   win->allocation.height = height_request;
5047   win->allocation.x = 0;
5048   win->allocation.y = 0;
5049
5050   return win;
5051 }
5052
5053 static void
5054 text_window_free (GtkTextWindow *win)
5055 {
5056   if (win->window)
5057     text_window_unrealize (win);
5058
5059   g_free (win);
5060 }
5061
5062 static void
5063 text_window_realize (GtkTextWindow *win,
5064                      GdkWindow     *parent)
5065 {
5066   GdkWindowAttr attributes;
5067   gint attributes_mask;
5068   GdkCursor *cursor;
5069
5070   attributes.window_type = GDK_WINDOW_CHILD;
5071   attributes.x = win->allocation.x;
5072   attributes.y = win->allocation.y;
5073   attributes.width = win->allocation.width;
5074   attributes.height = win->allocation.height;
5075   attributes.wclass = GDK_INPUT_OUTPUT;
5076   attributes.visual = gtk_widget_get_visual (win->widget);
5077   attributes.colormap = gtk_widget_get_colormap (win->widget);
5078   attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;
5079
5080   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
5081
5082   win->window = gdk_window_new (parent,
5083                                 &attributes,
5084                                 attributes_mask);
5085
5086   gdk_window_show (win->window);
5087   gdk_window_set_user_data (win->window, win->widget);
5088
5089   attributes.x = 0;
5090   attributes.y = 0;
5091   attributes.width = win->allocation.width;
5092   attributes.height = win->allocation.height;
5093   attributes.event_mask = (GDK_EXPOSURE_MASK            |
5094                            GDK_SCROLL_MASK              |
5095                            GDK_KEY_PRESS_MASK           |
5096                            GDK_BUTTON_PRESS_MASK        |
5097                            GDK_BUTTON_RELEASE_MASK      |
5098                            GDK_POINTER_MOTION_MASK      |
5099                            GDK_POINTER_MOTION_HINT_MASK |
5100                            gtk_widget_get_events (win->widget));
5101
5102   win->bin_window = gdk_window_new (win->window,
5103                                     &attributes,
5104                                     attributes_mask);
5105
5106   gdk_window_show (win->bin_window);
5107   gdk_window_set_user_data (win->bin_window, win->widget);
5108
5109   if (win->type == GTK_TEXT_WINDOW_TEXT)
5110     {
5111       /* I-beam cursor */
5112       cursor = gdk_cursor_new (GDK_XTERM);
5113       gdk_window_set_cursor (win->bin_window, cursor);
5114       gdk_cursor_destroy (cursor);
5115
5116       gtk_im_context_set_client_window (GTK_TEXT_VIEW (win->widget)->im_context,
5117                                         win->window);
5118
5119
5120       gdk_window_set_background (win->bin_window,
5121                                  &win->widget->style->base[GTK_WIDGET_STATE (win->widget)]);
5122     }
5123   else
5124     {
5125       gdk_window_set_background (win->bin_window,
5126                                  &win->widget->style->bg[GTK_WIDGET_STATE (win->widget)]);
5127     }
5128
5129   g_object_set_qdata (G_OBJECT (win->window),
5130                       g_quark_from_static_string ("gtk-text-view-text-window"),
5131                       win);
5132
5133   g_object_set_qdata (G_OBJECT (win->bin_window),
5134                       g_quark_from_static_string ("gtk-text-view-text-window"),
5135                       win);
5136 }
5137
5138 static void
5139 text_window_unrealize (GtkTextWindow *win)
5140 {
5141   if (win->type == GTK_TEXT_WINDOW_TEXT)
5142     {
5143       gtk_im_context_set_client_window (GTK_TEXT_VIEW (win->widget)->im_context,
5144                                         NULL);
5145     }
5146
5147   gdk_window_set_user_data (win->window, NULL);
5148   gdk_window_set_user_data (win->bin_window, NULL);
5149   gdk_window_destroy (win->bin_window);
5150   gdk_window_destroy (win->window);
5151   win->window = NULL;
5152   win->bin_window = NULL;
5153 }
5154
5155 static void
5156 text_window_size_allocate (GtkTextWindow *win,
5157                            GdkRectangle  *rect)
5158 {
5159   win->allocation = *rect;
5160
5161   if (win->window)
5162     {
5163       gdk_window_move_resize (win->window,
5164                               rect->x, rect->y,
5165                               rect->width, rect->height);
5166
5167       gdk_window_resize (win->bin_window,
5168                          rect->width, rect->height);
5169     }
5170 }
5171
5172 static void
5173 text_window_scroll        (GtkTextWindow *win,
5174                            gint           dx,
5175                            gint           dy)
5176 {
5177   if (dx != 0 || dy != 0)
5178     {
5179       gdk_window_scroll (win->bin_window, dx, dy);
5180     }
5181 }
5182
5183 void
5184 text_window_invalidate_rect (GtkTextWindow *win,
5185                              GdkRectangle  *rect)
5186 {
5187   GdkRectangle window_rect;
5188
5189   gtk_text_view_buffer_to_window_coords (GTK_TEXT_VIEW (win->widget),
5190                                          win->type,
5191                                          rect->x,
5192                                          rect->y,
5193                                          &window_rect.x,
5194                                          &window_rect.y);
5195
5196   window_rect.width = rect->width;
5197   window_rect.height = rect->height;
5198
5199   /* Adjust the rect as appropriate */
5200
5201   switch (win->type)
5202     {
5203     case GTK_TEXT_WINDOW_TEXT:
5204       break;
5205
5206     case GTK_TEXT_WINDOW_LEFT:
5207     case GTK_TEXT_WINDOW_RIGHT:
5208       window_rect.x = 0;
5209       window_rect.width = win->allocation.width;
5210       break;
5211
5212     case GTK_TEXT_WINDOW_TOP:
5213     case GTK_TEXT_WINDOW_BOTTOM:
5214       window_rect.y = 0;
5215       window_rect.height = win->allocation.height;
5216       break;
5217
5218     default:
5219       g_warning ("%s: bug!", G_STRLOC);
5220       return;
5221       break;
5222     }
5223
5224   gdk_window_invalidate_rect (win->bin_window, &window_rect, FALSE);
5225
5226 #if 0
5227   {
5228     GdkColor color = { 0, 65535, 0, 0 };
5229     GdkGC *gc = gdk_gc_new (win->bin_window);
5230     gdk_gc_set_rgb_fg_color (gc, &color);
5231     gdk_draw_rectangle (win->bin_window,
5232                         gc, TRUE, window_rect.x, window_rect.y,
5233                         window_rect.width, window_rect.height);
5234     gdk_gc_unref (gc);
5235   }
5236 #endif
5237 }
5238
5239 static gint
5240 text_window_get_width (GtkTextWindow *win)
5241 {
5242   return win->allocation.width;
5243 }
5244
5245 static gint
5246 text_window_get_height (GtkTextWindow *win)
5247 {
5248   return win->allocation.height;
5249 }
5250
5251 static void
5252 text_window_get_allocation (GtkTextWindow *win,
5253                             GdkRectangle  *rect)
5254 {
5255   *rect = win->allocation;
5256 }
5257
5258 /* Windows */
5259
5260
5261 /**
5262  * gtk_text_view_get_window:
5263  * @text_view: a #GtkTextView
5264  * @win: window to get
5265  *
5266  * Retrieves the #GdkWindow corresponding to an area of the text view;
5267  * possible windows include the overall widget window, child windows
5268  * on the left, right, top, bottom, and the window that displays the
5269  * text buffer. Windows are %NULL and nonexistent if their width or
5270  * height is 0, and are nonexistent before the widget has been
5271  * realized.
5272  *
5273  * Return value: a #GdkWindow, or %NULL
5274  **/
5275 GdkWindow*
5276 gtk_text_view_get_window (GtkTextView *text_view,
5277                           GtkTextWindowType win)
5278 {
5279   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);
5280
5281   switch (win)
5282     {
5283     case GTK_TEXT_WINDOW_WIDGET:
5284       return GTK_WIDGET (text_view)->window;
5285       break;
5286
5287     case GTK_TEXT_WINDOW_TEXT:
5288       return text_view->text_window->bin_window;
5289       break;
5290
5291     case GTK_TEXT_WINDOW_LEFT:
5292       if (text_view->left_window)
5293         return text_view->left_window->bin_window;
5294       else
5295         return NULL;
5296       break;
5297
5298     case GTK_TEXT_WINDOW_RIGHT:
5299       if (text_view->right_window)
5300         return text_view->right_window->bin_window;
5301       else
5302         return NULL;
5303       break;
5304
5305     case GTK_TEXT_WINDOW_TOP:
5306       if (text_view->top_window)
5307         return text_view->top_window->bin_window;
5308       else
5309         return NULL;
5310       break;
5311
5312     case GTK_TEXT_WINDOW_BOTTOM:
5313       if (text_view->bottom_window)
5314         return text_view->bottom_window->bin_window;
5315       else
5316         return NULL;
5317       break;
5318
5319     default:
5320       g_warning ("%s: Unknown GtkTextWindowType", G_STRLOC);
5321       return NULL;
5322       break;
5323     }
5324 }
5325
5326 /**
5327  * gtk_text_view_get_window_type:
5328  * @text_view: a #GtkTextView
5329  * @window: a window type
5330  *
5331  * Usually used to find out which window an event corresponds to.
5332  * If you connect to an event signal on @text_view, this function
5333  * should be called on <literal>event-&gt;window</literal> to
5334  * see which window it was.
5335  *
5336  * Return value: the window type.
5337  **/
5338 GtkTextWindowType
5339 gtk_text_view_get_window_type (GtkTextView *text_view,
5340                                GdkWindow   *window)
5341 {
5342   GtkTextWindow *win;
5343
5344   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), 0);
5345   g_return_val_if_fail (GDK_IS_WINDOW (text_view), 0);
5346
5347   if (window == GTK_WIDGET (text_view)->window)
5348     return GTK_TEXT_WINDOW_WIDGET;
5349
5350   win = g_object_get_qdata (G_OBJECT (window),
5351                             g_quark_try_string ("gtk-text-view-text-window"));
5352
5353   if (win)
5354     return win->type;
5355   else
5356     {
5357       return GTK_TEXT_WINDOW_PRIVATE;
5358     }
5359 }
5360
5361 static void
5362 buffer_to_widget (GtkTextView      *text_view,
5363                   gint              buffer_x,
5364                   gint              buffer_y,
5365                   gint             *window_x,
5366                   gint             *window_y)
5367 {
5368   if (window_x)
5369     {
5370       *window_x = buffer_x - text_view->xoffset + FOCUS_EDGE_WIDTH;
5371       if (text_view->left_window)
5372         *window_x += text_view->left_window->allocation.width;
5373     }
5374
5375   if (window_y)
5376     {
5377       *window_y = buffer_y - text_view->yoffset + FOCUS_EDGE_WIDTH;
5378       if (text_view->top_window)
5379         *window_y += text_view->top_window->allocation.height;
5380     }
5381 }
5382
5383 static void
5384 widget_to_text_window (GtkTextWindow *win,
5385                        gint           widget_x,
5386                        gint           widget_y,
5387                        gint          *window_x,
5388                        gint          *window_y)
5389 {
5390   if (window_x)
5391     *window_x = widget_x - win->allocation.x;
5392
5393   if (window_y)
5394     *window_y = widget_y - win->allocation.y;
5395 }
5396
5397 static void
5398 buffer_to_text_window (GtkTextView   *text_view,
5399                        GtkTextWindow *win,
5400                        gint           buffer_x,
5401                        gint           buffer_y,
5402                        gint          *window_x,
5403                        gint          *window_y)
5404 {
5405   if (win == NULL)
5406     {
5407       g_warning ("Attempt to convert text buffer coordinates to coordinates "
5408                  "for a nonexistent or private child window of GtkTextView");
5409       return;
5410     }
5411
5412   buffer_to_widget (text_view,
5413                     buffer_x, buffer_y,
5414                     window_x, window_y);
5415
5416   widget_to_text_window (win,
5417                          window_x ? *window_x : 0,
5418                          window_y ? *window_y : 0,
5419                          window_x,
5420                          window_y);
5421 }
5422
5423 /**
5424  * gtk_text_view_buffer_to_window_coords:
5425  * @text_view: a #GtkTextView
5426  * @win: a #GtkTextWindowType
5427  * @buffer_x: buffer x coordinate
5428  * @buffer_y: buffer y coordinate
5429  * @window_x: window x coordinate return location
5430  * @window_y: window y coordinate return location
5431  *
5432  * Converts coordinate (@buffer_x, @buffer_y) to coordinates for the window
5433  * @win, and stores the result in (@window_x, @window_y).
5434  **/
5435 void
5436 gtk_text_view_buffer_to_window_coords (GtkTextView      *text_view,
5437                                        GtkTextWindowType win,
5438                                        gint              buffer_x,
5439                                        gint              buffer_y,
5440                                        gint             *window_x,
5441                                        gint             *window_y)
5442 {
5443   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
5444
5445   switch (win)
5446     {
5447     case GTK_TEXT_WINDOW_WIDGET:
5448       buffer_to_widget (text_view,
5449                         buffer_x, buffer_y,
5450                         window_x, window_y);
5451       break;
5452
5453     case GTK_TEXT_WINDOW_TEXT:
5454       if (window_x)
5455         *window_x = buffer_x - text_view->xoffset;
5456       if (window_y)
5457         *window_y = buffer_y - text_view->yoffset;
5458       break;
5459
5460     case GTK_TEXT_WINDOW_LEFT:
5461       buffer_to_text_window (text_view,
5462                              text_view->left_window,
5463                              buffer_x, buffer_y,
5464                              window_x, window_y);
5465       break;
5466
5467     case GTK_TEXT_WINDOW_RIGHT:
5468       buffer_to_text_window (text_view,
5469                              text_view->right_window,
5470                              buffer_x, buffer_y,
5471                              window_x, window_y);
5472       break;
5473
5474     case GTK_TEXT_WINDOW_TOP:
5475       buffer_to_text_window (text_view,
5476                              text_view->top_window,
5477                              buffer_x, buffer_y,
5478                              window_x, window_y);
5479       break;
5480
5481     case GTK_TEXT_WINDOW_BOTTOM:
5482       buffer_to_text_window (text_view,
5483                              text_view->bottom_window,
5484                              buffer_x, buffer_y,
5485                              window_x, window_y);
5486       break;
5487
5488     case GTK_TEXT_WINDOW_PRIVATE:
5489       g_warning ("%s: can't get coords for private windows", G_STRLOC);
5490       break;
5491
5492     default:
5493       g_warning ("%s: Unknown GtkTextWindowType", G_STRLOC);
5494       break;
5495     }
5496 }
5497
5498 static void
5499 widget_to_buffer (GtkTextView *text_view,
5500                   gint         widget_x,
5501                   gint         widget_y,
5502                   gint        *buffer_x,
5503                   gint        *buffer_y)
5504 {
5505   if (buffer_x)
5506     {
5507       *buffer_x = widget_x - FOCUS_EDGE_WIDTH + text_view->xoffset;
5508       if (text_view->left_window)
5509         *buffer_x -= text_view->left_window->allocation.width;
5510     }
5511
5512   if (buffer_y)
5513     {
5514       *buffer_y = widget_y - FOCUS_EDGE_WIDTH + text_view->yoffset;
5515       if (text_view->top_window)
5516         *buffer_y -= text_view->top_window->allocation.height;
5517     }
5518 }
5519
5520 static void
5521 text_window_to_widget (GtkTextWindow *win,
5522                        gint           window_x,
5523                        gint           window_y,
5524                        gint          *widget_x,
5525                        gint          *widget_y)
5526 {
5527   if (widget_x)
5528     *widget_x = window_x + win->allocation.x;
5529
5530   if (widget_y)
5531     *widget_y = window_y + win->allocation.y;
5532 }
5533
5534 static void
5535 text_window_to_buffer (GtkTextView   *text_view,
5536                        GtkTextWindow *win,
5537                        gint           window_x,
5538                        gint           window_y,
5539                        gint          *buffer_x,
5540                        gint          *buffer_y)
5541 {
5542   if (win == NULL)
5543     {
5544       g_warning ("Attempt to convert GtkTextView buffer coordinates into "
5545                  "coordinates for a nonexistent child window.");
5546       return;
5547     }
5548
5549   text_window_to_widget (win,
5550                          window_x,
5551                          window_y,
5552                          buffer_x,
5553                          buffer_y);
5554
5555   widget_to_buffer (text_view,
5556                     buffer_x ? *buffer_x : 0,
5557                     buffer_y ? *buffer_y : 0,
5558                     buffer_x,
5559                     buffer_y);
5560 }
5561
5562 /**
5563  * gtk_text_view_window_to_buffer_coords:
5564  * @text_view: a #GtkTextView
5565  * @win: a #GtkTextWindowType
5566  * @window_x: window x coordinate
5567  * @window_y: window y coordinate
5568  * @buffer_x: buffer x coordinate return location
5569  * @buffer_y: buffer y coordinate return location
5570  *
5571  * Converts coordinates on the window identified by @win to buffer
5572  * coordinates, storing the result in (@buffer_x,@buffer_y).
5573  **/
5574 void
5575 gtk_text_view_window_to_buffer_coords (GtkTextView      *text_view,
5576                                        GtkTextWindowType win,
5577                                        gint              window_x,
5578                                        gint              window_y,
5579                                        gint             *buffer_x,
5580                                        gint             *buffer_y)
5581 {
5582   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
5583
5584   switch (win)
5585     {
5586     case GTK_TEXT_WINDOW_WIDGET:
5587       widget_to_buffer (text_view,
5588                         window_x, window_y,
5589                         buffer_x, buffer_y);
5590       break;
5591
5592     case GTK_TEXT_WINDOW_TEXT:
5593       if (buffer_x)
5594         *buffer_x = window_x + text_view->xoffset;
5595       if (buffer_y)
5596         *buffer_y = window_y + text_view->yoffset;
5597       break;
5598
5599     case GTK_TEXT_WINDOW_LEFT:
5600       text_window_to_buffer (text_view,
5601                              text_view->left_window,
5602                              window_x, window_y,
5603                              buffer_x, buffer_y);
5604       break;
5605
5606     case GTK_TEXT_WINDOW_RIGHT:
5607       text_window_to_buffer (text_view,
5608                              text_view->right_window,
5609                              window_x, window_y,
5610                              buffer_x, buffer_y);
5611       break;
5612
5613     case GTK_TEXT_WINDOW_TOP:
5614       text_window_to_buffer (text_view,
5615                              text_view->top_window,
5616                              window_x, window_y,
5617                              buffer_x, buffer_y);
5618       break;
5619
5620     case GTK_TEXT_WINDOW_BOTTOM:
5621       text_window_to_buffer (text_view,
5622                              text_view->bottom_window,
5623                              window_x, window_y,
5624                              buffer_x, buffer_y);
5625       break;
5626
5627     case GTK_TEXT_WINDOW_PRIVATE:
5628       g_warning ("%s: can't get coords for private windows", G_STRLOC);
5629       break;
5630
5631     default:
5632       g_warning ("%s: Unknown GtkTextWindowType", G_STRLOC);
5633       break;
5634     }
5635 }
5636
5637 static void
5638 set_window_width (GtkTextView      *text_view,
5639                   gint              width,
5640                   GtkTextWindowType type,
5641                   GtkTextWindow   **winp)
5642 {
5643   if (width == 0)
5644     {
5645       if (*winp)
5646         {
5647           text_window_free (*winp);
5648           *winp = NULL;
5649           gtk_widget_queue_resize (GTK_WIDGET (text_view));
5650         }
5651     }
5652   else
5653     {
5654       if (*winp == NULL)
5655         {
5656           *winp = text_window_new (type,
5657                                    GTK_WIDGET (text_view),
5658                                    width, 0);
5659           /* if the widget is already realized we need to realize the child manually */
5660           if (GTK_WIDGET_REALIZED (text_view))
5661             text_window_realize (*winp,
5662                          GTK_WIDGET(text_view)->window);
5663         }
5664       else
5665         {
5666           if ((*winp)->requisition.width == width)
5667             return;
5668         }
5669
5670       gtk_widget_queue_resize (GTK_WIDGET (text_view));
5671     }
5672 }
5673
5674
5675 static void
5676 set_window_height (GtkTextView      *text_view,
5677                    gint              height,
5678                    GtkTextWindowType type,
5679                    GtkTextWindow   **winp)
5680 {
5681   if (height == 0)
5682     {
5683       if (*winp)
5684         {
5685           text_window_free (*winp);
5686           *winp = NULL;
5687           gtk_widget_queue_resize (GTK_WIDGET (text_view));
5688         }
5689     }
5690   else
5691     {
5692       if (*winp == NULL)
5693         {
5694           *winp = text_window_new (type,
5695                                    GTK_WIDGET (text_view),
5696                                    0, height);
5697
5698           /* if the widget is already realized we need to realize the child manually */
5699           if (GTK_WIDGET_REALIZED (text_view))
5700             text_window_realize (*winp,
5701                          GTK_WIDGET(text_view)->window);
5702         }
5703       else
5704         {
5705           if ((*winp)->requisition.height == height)
5706             return;
5707         }
5708
5709       gtk_widget_queue_resize (GTK_WIDGET (text_view));
5710     }
5711 }
5712
5713 /**
5714  * gtk_text_view_set_border_window_size:
5715  * @text_view: a #GtkTextView
5716  * @type: window to affect
5717  * @size: width or height of the window
5718  *
5719  * Sets the width of %GTK_TEXT_WINDOW_LEFT or %GTK_TEXT_WINDOW_RIGHT,
5720  * or the height of %GTK_TEXT_WINDOW_TOP or %GTK_TEXT_WINDOW_BOTTOM.
5721  * Automatically destroys the corresponding window if the size is set to 0,
5722  * and creates the window if the size is set to non-zero.
5723  **/
5724 void
5725 gtk_text_view_set_border_window_size (GtkTextView      *text_view,
5726                                       GtkTextWindowType type,
5727                                       gint              size)
5728
5729 {
5730   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
5731   g_return_if_fail (size >= 0);
5732   g_return_if_fail (type != GTK_TEXT_WINDOW_WIDGET);
5733   g_return_if_fail (type != GTK_TEXT_WINDOW_TEXT);
5734
5735   switch (type)
5736     {
5737     case GTK_TEXT_WINDOW_LEFT:
5738       set_window_width (text_view, size, GTK_TEXT_WINDOW_LEFT,
5739                         &text_view->left_window);
5740       break;
5741
5742     case GTK_TEXT_WINDOW_RIGHT:
5743       set_window_width (text_view, size, GTK_TEXT_WINDOW_RIGHT,
5744                         &text_view->right_window);
5745       break;
5746
5747     case GTK_TEXT_WINDOW_TOP:
5748       set_window_height (text_view, size, GTK_TEXT_WINDOW_TOP,
5749                          &text_view->top_window);
5750       break;
5751
5752     case GTK_TEXT_WINDOW_BOTTOM:
5753       set_window_height (text_view, size, GTK_TEXT_WINDOW_BOTTOM,
5754                          &text_view->bottom_window);
5755       break;
5756
5757     default:
5758       g_warning ("Can't set size of center or widget or private GtkTextWindowType in %s", G_STRLOC);
5759       break;
5760     }
5761 }
5762
5763 /**
5764  * gtk_text_view_set_text_window_size:
5765  * @text_view: a #GtkTextView
5766  * @width: a width in pixels
5767  * @height: a height in pixels
5768  *
5769  * Sets the size request for the main text window (%GTK_TEXT_WINDOW_TEXT).
5770  * If the widget gets more space than it requested, the main text window
5771  * will be larger than this.
5772  *
5773  **/
5774 void
5775 gtk_text_view_set_text_window_size (GtkTextView *text_view,
5776                                     gint         width,
5777                                     gint         height)
5778 {
5779   GtkTextWindow *win;
5780
5781   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
5782   g_return_if_fail (width > 0);
5783   g_return_if_fail (height > 0);
5784
5785   win = text_view->text_window;
5786
5787   if (win->requisition.width == width &&
5788       win->requisition.height == height)
5789     return;
5790
5791   win->requisition.width = width;
5792   win->requisition.height = height;
5793
5794   gtk_widget_queue_resize (GTK_WIDGET (text_view));
5795 }
5796
5797 /*
5798  * Child widgets
5799  */
5800
5801 static GtkTextViewChild*
5802 text_view_child_new_anchored (GtkWidget          *child,
5803                               GtkTextChildAnchor *anchor,
5804                               GtkTextLayout      *layout)
5805 {
5806   GtkTextViewChild *vc;
5807
5808   vc = g_new (GtkTextViewChild, 1);
5809
5810   vc->widget = child;
5811   vc->anchor = anchor;
5812
5813   vc->from_top_of_line = 0;
5814   vc->from_left_of_buffer = 0;
5815
5816   g_object_ref (G_OBJECT (vc->widget));
5817   g_object_ref (G_OBJECT (vc->anchor));
5818
5819   g_object_set_data (G_OBJECT (child),
5820                      "gtk-text-view-child",
5821                      vc);
5822
5823   gtk_text_child_anchor_register_child (anchor, child, layout);
5824
5825   return vc;
5826 }
5827
5828 static GtkTextViewChild*
5829 text_view_child_new_window (GtkWidget          *child,
5830                             GtkTextWindowType   type,
5831                             gint                x,
5832                             gint                y)
5833 {
5834   GtkTextViewChild *vc;
5835
5836   vc = g_new (GtkTextViewChild, 1);
5837
5838   vc->widget = child;
5839   vc->anchor = NULL;
5840
5841   vc->from_top_of_line = 0;
5842   vc->from_left_of_buffer = 0;
5843
5844   g_object_ref (G_OBJECT (vc->widget));
5845
5846   vc->type = type;
5847   vc->x = x;
5848   vc->y = y;
5849
5850   return vc;
5851 }
5852
5853 static void
5854 text_view_child_free (GtkTextViewChild *child)
5855 {
5856   g_object_set_data (G_OBJECT (child->widget),
5857                      "gtk-text-view-child", NULL);
5858
5859   if (child->anchor)
5860     {
5861       gtk_text_child_anchor_unregister_child (child->anchor,
5862                                               child->widget);
5863       g_object_unref (G_OBJECT (child->anchor));
5864     }
5865
5866   g_object_unref (G_OBJECT (child->widget));
5867
5868   g_free (child);
5869 }
5870
5871 static void
5872 text_view_child_realize (GtkTextView      *text_view,
5873                          GtkTextViewChild *vc)
5874 {
5875   if (vc->anchor)
5876     gtk_widget_set_parent_window (vc->widget,
5877                                   text_view->text_window->bin_window);
5878   else
5879     {
5880       GdkWindow *window;
5881       window = gtk_text_view_get_window (text_view,
5882                                          vc->type);
5883       gtk_widget_set_parent_window (vc->widget, window);
5884     }
5885
5886   gtk_widget_realize (vc->widget);
5887 }
5888
5889 static void
5890 add_child (GtkTextView      *text_view,
5891            GtkTextViewChild *vc)
5892 {
5893   text_view->children = g_slist_prepend (text_view->children,
5894                                          vc);
5895
5896   gtk_widget_set_parent (vc->widget, GTK_WIDGET (text_view));
5897
5898   if (GTK_WIDGET_REALIZED (text_view))
5899     text_view_child_realize (text_view, vc);
5900
5901   if (GTK_WIDGET_VISIBLE (text_view) && GTK_WIDGET_VISIBLE (vc->widget))
5902     {
5903       if (GTK_WIDGET_MAPPED (text_view))
5904         gtk_widget_map (vc->widget);
5905
5906       gtk_widget_queue_resize (vc->widget);
5907     }
5908 }
5909
5910 void
5911 gtk_text_view_add_child_at_anchor (GtkTextView          *text_view,
5912                                    GtkWidget            *child,
5913                                    GtkTextChildAnchor   *anchor)
5914 {
5915   GtkTextViewChild *vc;
5916
5917   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
5918   g_return_if_fail (GTK_IS_WIDGET (child));
5919   g_return_if_fail (GTK_IS_TEXT_CHILD_ANCHOR (anchor));
5920   g_return_if_fail (child->parent == NULL);
5921
5922   gtk_text_view_ensure_layout (text_view);
5923
5924   vc = text_view_child_new_anchored (child, anchor,
5925                                      text_view->layout);
5926
5927   add_child (text_view, vc);
5928 }
5929
5930 void
5931 gtk_text_view_add_child_in_window (GtkTextView          *text_view,
5932                                    GtkWidget            *child,
5933                                    GtkTextWindowType     which_window,
5934                                    gint                  xpos,
5935                                    gint                  ypos)
5936 {
5937   GtkTextViewChild *vc;
5938
5939   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
5940   g_return_if_fail (GTK_IS_WIDGET (child));
5941   g_return_if_fail (xpos >= 0);
5942   g_return_if_fail (ypos >= 0);
5943   g_return_if_fail (child->parent == NULL);
5944
5945   vc = text_view_child_new_window (child, which_window,
5946                                    xpos, ypos);
5947
5948   add_child (text_view, vc);
5949 }
5950
5951 void
5952 gtk_text_view_move_child          (GtkTextView          *text_view,
5953                                    GtkWidget            *child,
5954                                    gint                  xpos,
5955                                    gint                  ypos)
5956 {
5957   GtkTextViewChild *vc;
5958
5959   g_return_if_fail (GTK_IS_TEXT_VIEW (text_view));
5960   g_return_if_fail (GTK_IS_WIDGET (child));
5961   g_return_if_fail (xpos >= 0);
5962   g_return_if_fail (ypos >= 0);
5963   g_return_if_fail (child->parent == (GtkWidget*) text_view);
5964
5965   vc = g_object_get_data (G_OBJECT (child),
5966                           "gtk-text-view-child");
5967
5968   g_assert (vc != NULL);
5969
5970   vc->x = xpos;
5971   vc->y = ypos;
5972
5973   if (GTK_WIDGET_VISIBLE (child) && GTK_WIDGET_VISIBLE (text_view))
5974     gtk_widget_queue_resize (child);
5975 }
5976
5977
5978
5979 /* Iterator operations */
5980
5981 gboolean
5982 gtk_text_view_forward_display_line (GtkTextView *text_view,
5983                                     GtkTextIter *iter)
5984 {
5985   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
5986   g_return_val_if_fail (iter != NULL, FALSE);
5987
5988   gtk_text_view_ensure_layout (text_view);
5989
5990   return gtk_text_layout_move_iter_to_next_line (text_view->layout, iter);
5991 }
5992
5993 gboolean
5994 gtk_text_view_backward_display_line (GtkTextView *text_view,
5995                                      GtkTextIter *iter)
5996 {
5997   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
5998   g_return_val_if_fail (iter != NULL, FALSE);
5999
6000   gtk_text_view_ensure_layout (text_view);
6001
6002   return gtk_text_layout_move_iter_to_previous_line (text_view->layout, iter);
6003 }
6004
6005 gboolean
6006 gtk_text_view_forward_display_line_end (GtkTextView *text_view,
6007                                         GtkTextIter *iter)
6008 {
6009   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
6010   g_return_val_if_fail (iter != NULL, FALSE);
6011
6012   gtk_text_view_ensure_layout (text_view);
6013
6014   return gtk_text_layout_move_iter_to_line_end (text_view->layout, iter, 1);
6015 }
6016
6017 gboolean
6018 gtk_text_view_backward_display_line_start (GtkTextView *text_view,
6019                                            GtkTextIter *iter)
6020 {
6021   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
6022   g_return_val_if_fail (iter != NULL, FALSE);
6023
6024   gtk_text_view_ensure_layout (text_view);
6025
6026   return gtk_text_layout_move_iter_to_line_end (text_view->layout, iter, -1);
6027 }
6028
6029 gboolean
6030 gtk_text_view_starts_display_line (GtkTextView       *text_view,
6031                                    const GtkTextIter *iter)
6032 {
6033   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
6034   g_return_val_if_fail (iter != NULL, FALSE);
6035
6036   gtk_text_view_ensure_layout (text_view);
6037
6038   return gtk_text_layout_iter_starts_line (text_view->layout, iter);
6039 }
6040
6041 gboolean
6042 gtk_text_view_move_visually (GtkTextView *text_view,
6043                              GtkTextIter *iter,
6044                              gint         count)
6045 {
6046   g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), FALSE);
6047   g_return_val_if_fail (iter != NULL, FALSE);
6048
6049   gtk_text_view_ensure_layout (text_view);
6050
6051   return gtk_text_layout_move_iter_visually (text_view->layout, iter, count);
6052 }
6053
6054