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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   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 <gdk/gdkkeysyms.h>
  28 #include "gtkbindings.h"
  29 #include "gtkmarshalers.h"
  30 #include "gtkscrolledwindow.h"
  31 #include "gtksignal.h"
  32 #include "gtkintl.h"
  33
  34
  35 /* scrolled window policy and size requisition handling:
  36  *
  37  * gtk size requisition works as follows:
  38  *   a widget upon size-request reports the width and height that it finds
  39  *   to be best suited to display its contents, including children.
  40  *   the width and/or height reported from a widget upon size requisition
  41  *   may be overidden by the user by specifying a width and/or height
  42  *   other than 0 through gtk_widget_set_usize().
  43  *
  44  * a scrolled window needs (for imlementing all three policy types) to
  45  * request its width and height based on two different rationales.
  46  * 1)   the user wants the scrolled window to just fit into the space
  47  *      that it gets allocated for a specifc dimension.
  48  * 1.1) this does not apply if the user specified a concrete value
  49  *      value for that specific dimension by either specifying usize for the
  50  *      scrolled window or for its child.
  51  * 2)   the user wants the scrolled window to take as much space up as
  52  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
  53  *
  54  * also, kinda obvious:
  55  * 3)   a user would certainly not have choosen a scrolled window as a container
  56  *      for the child, if the resulting allocation takes up more space than the
  57  *      child would have allocated without the scrolled window.
  58  *
  59  * conclusions:
  60  * A) from 1) follows: the scrolled window shouldn't request more space for a
  61  *    specifc dimension than is required at minimum.
  62  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
  63  *    window (done automatically) or by usize of the child (needs to be checked).
  64  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
  65  *    child's dimension.
  66  * D) from 3) follows: the scrolled window child's minimum width and minimum height
  67  *    under A) at least correspond to the space taken up by its scrollbars.
  68  */
  69
  70 #define SCROLLBAR_SPACING(w) (GTK_SCROLLED_WINDOW_GET_CLASS (w)->scrollbar_spacing)
  71
  72 #define DEFAULT_SCROLLBAR_SPACING  3
  73
  74 enum {
  75   PROP_0,
  76   PROP_HADJUSTMENT,
  77   PROP_VADJUSTMENT,
  78   PROP_HSCROLLBAR_POLICY,
  79   PROP_VSCROLLBAR_POLICY,
  80   PROP_WINDOW_PLACEMENT,
  81   PROP_SHADOW_TYPE,
  82   PROP_LAST
  83 };
  84
  85 /* Signals */
  86 enum
  87 {
  88   SCROLL_CHILD,
  89   MOVE_FOCUS_OUT,
  90   LAST_SIGNAL
  91 };
  92
  93 static void gtk_scrolled_window_class_init         (GtkScrolledWindowClass *klass);
  94 static void gtk_scrolled_window_init               (GtkScrolledWindow      *scrolled_window);
  95 static void gtk_scrolled_window_destroy            (GtkObject              *object);
  96 static void gtk_scrolled_window_finalize           (GObject                *object);
  97 static void gtk_scrolled_window_set_property       (GObject                *object,
  98                                                     guint                   prop_id,
  99                                                     const GValue           *value,
 100                                                     GParamSpec             *pspec);
 101 static void gtk_scrolled_window_get_property       (GObject                *object,
 102                                                     guint                   prop_id,
 103                                                     GValue                 *value,
 104                                                     GParamSpec             *pspec);
 105
 106 static gint gtk_scrolled_window_expose             (GtkWidget              *widget,
 107                                                     GdkEventExpose         *event);
 108 static void gtk_scrolled_window_size_request       (GtkWidget              *widget,
 109                                                     GtkRequisition         *requisition);
 110 static void gtk_scrolled_window_size_allocate      (GtkWidget              *widget,
 111                                                     GtkAllocation          *allocation);
 112 static gint gtk_scrolled_window_scroll_event       (GtkWidget              *widget,
 113                                                     GdkEventScroll         *event);
 114 static gint gtk_scrolled_window_focus              (GtkWidget              *widget,
 115                                                     GtkDirectionType        direction);
 116 static void gtk_scrolled_window_add                (GtkContainer           *container,
 117                                                     GtkWidget              *widget);
 118 static void gtk_scrolled_window_remove             (GtkContainer           *container,
 119                                                     GtkWidget              *widget);
 120 static void gtk_scrolled_window_forall             (GtkContainer           *container,
 121                                                     gboolean                include_internals,
 122                                                     GtkCallback             callback,
 123                                                     gpointer                callback_data);
 124 static void gtk_scrolled_window_scroll_child       (GtkScrolledWindow      *scrolled_window,
 125                                                     GtkScrollType           scroll,
 126                                                     gboolean                horizontal);
 127 static void gtk_scrolled_window_move_focus_out     (GtkScrolledWindow      *scrolled_window,
 128                                                     GtkDirectionType        direction_type);
 129
 130 static void gtk_scrolled_window_relative_allocation(GtkWidget              *widget,
 131                                                     GtkAllocation          *allocation);
 132 static void gtk_scrolled_window_adjustment_changed (GtkAdjustment          *adjustment,
 133                                                     gpointer                data);
 134
 135 static GtkContainerClass *parent_class = NULL;
 136
 137 static guint signals[LAST_SIGNAL] = {0};
 138
 139 GtkType
 140 gtk_scrolled_window_get_type (void)
 141 {
 142   static GtkType scrolled_window_type = 0;
 143
 144   if (!scrolled_window_type)
 145     {
 146       static const GtkTypeInfo scrolled_window_info =
 147       {
 148         "GtkScrolledWindow",
 149         sizeof (GtkScrolledWindow),
 150         sizeof (GtkScrolledWindowClass),
 151         (GtkClassInitFunc) gtk_scrolled_window_class_init,
 152         (GtkObjectInitFunc) gtk_scrolled_window_init,
 153         /* reserved_1 */ NULL,
 154         /* reserved_2 */ NULL,
 155         (GtkClassInitFunc) NULL,
 156       };
 157
 158       scrolled_window_type = gtk_type_unique (GTK_TYPE_BIN, &scrolled_window_info);
 159     }
 160
 161   return scrolled_window_type;
 162 }
 163
 164 static void
 165 add_scroll_binding (GtkBindingSet  *binding_set,
 166                     guint           keyval,
 167                     GdkModifierType mask,
 168                     GtkScrollType   scroll,
 169                     gboolean        horizontal)
 170 {
 171   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 172
 173   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 174                                 "scroll_child", 2,
 175                                 GTK_TYPE_SCROLL_TYPE, scroll,
 176                                 G_TYPE_BOOLEAN, horizontal);
 177   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 178                                 "scroll_child", 2,
 179                                 GTK_TYPE_SCROLL_TYPE, scroll,
 180                                 G_TYPE_BOOLEAN, horizontal);
 181 }
 182
 183 static void
 184 add_tab_bindings (GtkBindingSet    *binding_set,
 185                   GdkModifierType   modifiers,
 186                   GtkDirectionType  direction)
 187 {
 188   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 189                                 "move_focus_out", 1,
 190                                 GTK_TYPE_DIRECTION_TYPE, direction);
 191   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 192                                 "move_focus_out", 1,
 193                                 GTK_TYPE_DIRECTION_TYPE, direction);
 194 }
 195
 196 static void
 197 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 198 {
 199   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 200   GtkObjectClass *object_class;
 201   GtkWidgetClass *widget_class;
 202   GtkContainerClass *container_class;
 203   GtkBindingSet *binding_set;
 204
 205   object_class = (GtkObjectClass*) class;
 206   widget_class = (GtkWidgetClass*) class;
 207   container_class = (GtkContainerClass*) class;
 208   parent_class = gtk_type_class (GTK_TYPE_BIN);
 209
 210   gobject_class->finalize = gtk_scrolled_window_finalize;
 211   gobject_class->set_property = gtk_scrolled_window_set_property;
 212   gobject_class->get_property = gtk_scrolled_window_get_property;
 213
 214   object_class->destroy = gtk_scrolled_window_destroy;
 215
 216   widget_class->expose_event = gtk_scrolled_window_expose;
 217   widget_class->size_request = gtk_scrolled_window_size_request;
 218   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 219   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 220   widget_class->focus = gtk_scrolled_window_focus;
 221
 222   container_class->add = gtk_scrolled_window_add;
 223   container_class->remove = gtk_scrolled_window_remove;
 224   container_class->forall = gtk_scrolled_window_forall;
 225
 226   class->scrollbar_spacing = DEFAULT_SCROLLBAR_SPACING;
 227
 228   class->scroll_child = gtk_scrolled_window_scroll_child;
 229   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 230
 231   g_object_class_install_property (gobject_class,
 232                                    PROP_HADJUSTMENT,
 233                                    g_param_spec_object ("hadjustment",
 234                                                         _("Horizontal Adjustment"),
 235                                                         _("The GtkAdjustment for the horizontal position."),
 236                                                         GTK_TYPE_ADJUSTMENT,
 237                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 238   g_object_class_install_property (gobject_class,
 239                                    PROP_VADJUSTMENT,
 240                                    g_param_spec_object ("vadjustment",
 241                                                         _("Vertical Adjustment"),
 242                                                         _("The GtkAdjustment for the vertical position."),
 243                                                         GTK_TYPE_ADJUSTMENT,
 244                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 245   g_object_class_install_property (gobject_class,
 246                                    PROP_HSCROLLBAR_POLICY,
 247                                    g_param_spec_enum ("hscrollbar_policy",
 248                                                       _("Horizontal Scrollbar Policy"),
 249                                                       _("When the horizontal scrollbar is displayed"),
 250                                                       GTK_TYPE_POLICY_TYPE,
 251                                                       GTK_POLICY_ALWAYS,
 252                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 253   g_object_class_install_property (gobject_class,
 254                                    PROP_VSCROLLBAR_POLICY,
 255                                    g_param_spec_enum ("vscrollbar_policy",
 256                                                       _("Vertical Scrollbar Policy"),
 257                                                       _("When the vertical scrollbar is displayed"),
 258                                                       GTK_TYPE_POLICY_TYPE,
 259                                                       GTK_POLICY_ALWAYS,
 260                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 261
 262   g_object_class_install_property (gobject_class,
 263                                    PROP_WINDOW_PLACEMENT,
 264                                    g_param_spec_enum ("window_placement",
 265                                                       _("Window Placement"),
 266                                                       _("Where the contents are located with respect to the scrollbars"),
 267                                                       GTK_TYPE_CORNER_TYPE,
 268                                                       GTK_CORNER_TOP_LEFT,
 269                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 270   g_object_class_install_property (gobject_class,
 271                                    PROP_SHADOW_TYPE,
 272                                    g_param_spec_enum ("shadow_type",
 273                                                       _("Shadow Type"),
 274                                                       _("Style of bevel around the contents"),
 275                                                       GTK_TYPE_SHADOW_TYPE,
 276                                                       GTK_SHADOW_NONE,
 277                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 278
 279   signals[SCROLL_CHILD] =
 280     g_signal_new ("scroll_child",
 281                   G_TYPE_FROM_CLASS (object_class),
 282                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 283                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 284                   NULL, NULL,
 285                   _gtk_marshal_VOID__ENUM_BOOLEAN,
 286                   G_TYPE_NONE, 2,
 287                   GTK_TYPE_SCROLL_TYPE,
 288                   G_TYPE_BOOLEAN);
 289   signals[MOVE_FOCUS_OUT] =
 290     g_signal_new ("move_focus_out",
 291                   G_TYPE_FROM_CLASS (object_class),
 292                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 293                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 294                   NULL, NULL,
 295                   _gtk_marshal_VOID__ENUM,
 296                   G_TYPE_NONE, 1,
 297                   GTK_TYPE_DIRECTION_TYPE);
 298
 299   binding_set = gtk_binding_set_by_class (class);
 300
 301   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 302   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 303   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 304   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 305
 306   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 307   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 308   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 309   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 310
 311   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 312   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 313   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 314   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 315
 316   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 317   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 318 }
 319
 320 static void
 321 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 322 {
 323   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 324
 325   gtk_container_set_resize_mode (GTK_CONTAINER (scrolled_window), GTK_RESIZE_QUEUE);
 326
 327   scrolled_window->hscrollbar = NULL;
 328   scrolled_window->vscrollbar = NULL;
 329   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 330   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 331   scrolled_window->hscrollbar_visible = FALSE;
 332   scrolled_window->vscrollbar_visible = FALSE;
 333   scrolled_window->focus_out = FALSE;
 334   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 335
 336 }
 337
 338 GtkWidget*
 339 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 340                          GtkAdjustment *vadjustment)
 341 {
 342   GtkWidget *scrolled_window;
 343
 344   if (hadjustment)
 345     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 346
 347   if (vadjustment)
 348     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 349
 350   scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
 351                                     "hadjustment", hadjustment,
 352                                     "vadjustment", vadjustment,
 353                                     NULL);
 354
 355   return scrolled_window;
 356 }
 357
 358 void
 359 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 360                                      GtkAdjustment     *hadjustment)
 361 {
 362   GtkBin *bin;
 363
 364   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 365   if (hadjustment)
 366     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 367   else
 368     hadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 369
 370   bin = GTK_BIN (scrolled_window);
 371
 372   if (!scrolled_window->hscrollbar)
 373     {
 374       gtk_widget_push_composite_child ();
 375       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 376       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 377       gtk_widget_pop_composite_child ();
 378
 379       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 380       gtk_widget_ref (scrolled_window->hscrollbar);
 381       gtk_widget_show (scrolled_window->hscrollbar);
 382     }
 383   else
 384     {
 385       GtkAdjustment *old_adjustment;
 386
 387       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 388       if (old_adjustment == hadjustment)
 389         return;
 390
 391       gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
 392                                      GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
 393                                      scrolled_window);
 394       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 395                                 hadjustment);
 396     }
 397   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 398   gtk_signal_connect (GTK_OBJECT (hadjustment),
 399                       "changed",
 400                       GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
 401                       scrolled_window);
 402   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 403
 404   if (bin->child)
 405     gtk_widget_set_scroll_adjustments (bin->child,
 406                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 407                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 408
 409   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 410 }
 411
 412 void
 413 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 414                                      GtkAdjustment     *vadjustment)
 415 {
 416   GtkBin *bin;
 417
 418   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 419   if (vadjustment)
 420     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 421   else
 422     vadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 423
 424   bin = GTK_BIN (scrolled_window);
 425
 426   if (!scrolled_window->vscrollbar)
 427     {
 428       gtk_widget_push_composite_child ();
 429       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 430       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 431       gtk_widget_pop_composite_child ();
 432
 433       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 434       gtk_widget_ref (scrolled_window->vscrollbar);
 435       gtk_widget_show (scrolled_window->vscrollbar);
 436     }
 437   else
 438     {
 439       GtkAdjustment *old_adjustment;
 440
 441       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 442       if (old_adjustment == vadjustment)
 443         return;
 444
 445       gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
 446                                      GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
 447                                      scrolled_window);
 448       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 449                                 vadjustment);
 450     }
 451   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 452   gtk_signal_connect (GTK_OBJECT (vadjustment),
 453                       "changed",
 454                       GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
 455                       scrolled_window);
 456   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 457
 458   if (bin->child)
 459     gtk_widget_set_scroll_adjustments (bin->child,
 460                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 461                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 462
 463   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 464 }
 465
 466 GtkAdjustment*
 467 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 468 {
 469   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 470
 471   return (scrolled_window->hscrollbar ?
 472           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 473           NULL);
 474 }
 475
 476 GtkAdjustment*
 477 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 478 {
 479   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 480
 481   return (scrolled_window->vscrollbar ?
 482           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 483           NULL);
 484 }
 485
 486 void
 487 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 488                                 GtkPolicyType      hscrollbar_policy,
 489                                 GtkPolicyType      vscrollbar_policy)
 490 {
 491   GObject *object = G_OBJECT (scrolled_window);
 492
 493   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 494
 495   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 496       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 497     {
 498       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 499       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 500
 501       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 502
 503       g_object_freeze_notify (object);
 504       g_object_notify (object, "hscrollbar_policy");
 505       g_object_notify (object, "vscrollbar_policy");
 506       g_object_thaw_notify (object);
 507     }
 508 }
 509
 510 /**
 511  * gtk_scrolled_window_get_policy:
 512  * @scrolled_window: a #GtkScrolledWindow
 513  * @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 514  * @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 515  *
 516  * Retrieves the current policy values for the horizontal and vertical
 517  * scrollbars. See gtk_scrolled_window_set_policy().
 518  **/
 519 void
 520 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 521                                 GtkPolicyType     *hscrollbar_policy,
 522                                 GtkPolicyType     *vscrollbar_policy)
 523 {
 524   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 525
 526   if (hscrollbar_policy)
 527     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 528   if (vscrollbar_policy)
 529     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 530 }
 531
 532 void
 533 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 534                                    GtkCornerType      window_placement)
 535 {
 536   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 537
 538   if (scrolled_window->window_placement != window_placement)
 539     {
 540       scrolled_window->window_placement = window_placement;
 541
 542       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 543
 544       g_object_notify (G_OBJECT (scrolled_window), "window_placement");
 545     }
 546 }
 547
 548 /**
 549  * gtk_scrolled_window_get_placement:
 550  * @scrolled_window: a #GtkScrolledWindow
 551  *
 552  * Gets the placement of the scrollbars for the scrolled window. See
 553  * gtk_scrolled_window_set_placement().
 554  *
 555  * Return value: the current placement value.
 556  **/
 557 GtkCornerType
 558 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 559 {
 560   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 561
 562   return scrolled_window->window_placement;
 563 }
 564
 565 /**
 566  * gtk_scrolled_window_set_shadow_type:
 567  * @scrolled_window: a #GtkScrolledWindow
 568  * @type: kind of shadow to draw around scrolled window contents
 569  *
 570  * Changes the type of shadow drawn around the contents of
 571  * @scrolled_window.
 572  *
 573  **/
 574 void
 575 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 576                                      GtkShadowType      type)
 577 {
 578   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 579   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 580
 581   if (scrolled_window->shadow_type != type)
 582     {
 583       scrolled_window->shadow_type = type;
 584
 585       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 586         gtk_widget_queue_clear (GTK_WIDGET (scrolled_window));
 587
 588       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 589
 590       g_object_notify (G_OBJECT (scrolled_window), "shadow_type");
 591     }
 592 }
 593
 594 /**
 595  * gtk_scrolled_window_get_shadow_type:
 596  * @scrolled_window: a #GtkScrolledWindow
 597  *
 598  * Gets the shadow type of the scrolled window. See
 599  * gtk_scrolled_window_set_shadow_type().
 600  *
 601  * Return value: the current shadow type
 602  **/
 603 GtkShadowType
 604 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 605 {
 606   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 607
 608   return scrolled_window->shadow_type;
 609 }
 610
 611 static void
 612 gtk_scrolled_window_destroy (GtkObject *object)
 613 {
 614   GtkScrolledWindow *scrolled_window;
 615
 616   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
 617
 618   scrolled_window = GTK_SCROLLED_WINDOW (object);
 619
 620   gtk_widget_unparent (scrolled_window->hscrollbar);
 621   gtk_widget_unparent (scrolled_window->vscrollbar);
 622   gtk_widget_destroy (scrolled_window->hscrollbar);
 623   gtk_widget_destroy (scrolled_window->vscrollbar);
 624
 625   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 626 }
 627
 628 static void
 629 gtk_scrolled_window_finalize (GObject *object)
 630 {
 631   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 632
 633   gtk_widget_unref (scrolled_window->hscrollbar);
 634   gtk_widget_unref (scrolled_window->vscrollbar);
 635
 636   G_OBJECT_CLASS (parent_class)->finalize (object);
 637 }
 638
 639 static void
 640 gtk_scrolled_window_set_property (GObject      *object,
 641                                   guint         prop_id,
 642                                   const GValue *value,
 643                                   GParamSpec   *pspec)
 644 {
 645   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 646
 647   switch (prop_id)
 648     {
 649     case PROP_HADJUSTMENT:
 650       gtk_scrolled_window_set_hadjustment (scrolled_window,
 651                                            g_value_get_object (value));
 652       break;
 653     case PROP_VADJUSTMENT:
 654       gtk_scrolled_window_set_vadjustment (scrolled_window,
 655                                            g_value_get_object (value));
 656       break;
 657     case PROP_HSCROLLBAR_POLICY:
 658       gtk_scrolled_window_set_policy (scrolled_window,
 659                                       g_value_get_enum (value),
 660                                       scrolled_window->vscrollbar_policy);
 661       break;
 662     case PROP_VSCROLLBAR_POLICY:
 663       gtk_scrolled_window_set_policy (scrolled_window,
 664                                       scrolled_window->hscrollbar_policy,
 665                                       g_value_get_enum (value));
 666       break;
 667     case PROP_WINDOW_PLACEMENT:
 668       gtk_scrolled_window_set_placement (scrolled_window,
 669                                          g_value_get_enum (value));
 670       break;
 671     case PROP_SHADOW_TYPE:
 672       gtk_scrolled_window_set_shadow_type (scrolled_window,
 673                                            g_value_get_enum (value));
 674       break;
 675     default:
 676       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 677       break;
 678     }
 679 }
 680
 681 static void
 682 gtk_scrolled_window_get_property (GObject    *object,
 683                                   guint       prop_id,
 684                                   GValue     *value,
 685                                   GParamSpec *pspec)
 686 {
 687   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 688
 689   switch (prop_id)
 690     {
 691     case PROP_HADJUSTMENT:
 692       g_value_set_object (value,
 693                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 694       break;
 695     case PROP_VADJUSTMENT:
 696       g_value_set_object (value,
 697                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 698       break;
 699     case PROP_HSCROLLBAR_POLICY:
 700       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 701       break;
 702     case PROP_VSCROLLBAR_POLICY:
 703       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 704       break;
 705     case PROP_WINDOW_PLACEMENT:
 706       g_value_set_enum (value, scrolled_window->window_placement);
 707       break;
 708     case PROP_SHADOW_TYPE:
 709       g_value_set_enum (value, scrolled_window->shadow_type);
 710       break;
 711     default:
 712       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 713       break;
 714     }
 715 }
 716
 717 static void
 718 gtk_scrolled_window_paint (GtkWidget    *widget,
 719                            GdkRectangle *area)
 720 {
 721   GtkAllocation relative_allocation;
 722   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 723
 724   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 725     {
 726       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
 727
 728       relative_allocation.x -= widget->style->xthickness;
 729       relative_allocation.y -= widget->style->ythickness;
 730       relative_allocation.width += 2 * widget->style->xthickness;
 731       relative_allocation.height += 2 * widget->style->ythickness;
 732
 733       gtk_paint_shadow (widget->style, widget->window,
 734                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
 735                         area, widget, "scrolled_window",
 736                         widget->allocation.x + relative_allocation.x,
 737                         widget->allocation.y + relative_allocation.y,
 738                         relative_allocation.width,
 739                         relative_allocation.height);
 740     }
 741 }
 742
 743 static gint
 744 gtk_scrolled_window_expose (GtkWidget      *widget,
 745                             GdkEventExpose *event)
 746 {
 747   if (GTK_WIDGET_DRAWABLE (widget))
 748     {
 749       gtk_scrolled_window_paint (widget, &event->area);
 750
 751       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 752     }
 753
 754   return FALSE;
 755 }
 756
 757 static void
 758 gtk_scrolled_window_forall (GtkContainer *container,
 759                             gboolean      include_internals,
 760                             GtkCallback   callback,
 761                             gpointer      callback_data)
 762 {
 763   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 764   g_return_if_fail (callback != NULL);
 765
 766   GTK_CONTAINER_CLASS (parent_class)->forall (container,
 767                                               include_internals,
 768                                               callback,
 769                                               callback_data);
 770   if (include_internals)
 771     {
 772       GtkScrolledWindow *scrolled_window;
 773
 774       scrolled_window = GTK_SCROLLED_WINDOW (container);
 775
 776       if (scrolled_window->vscrollbar)
 777         callback (scrolled_window->vscrollbar, callback_data);
 778       if (scrolled_window->hscrollbar)
 779         callback (scrolled_window->hscrollbar, callback_data);
 780     }
 781 }
 782
 783 static void
 784 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
 785                                   GtkScrollType      scroll,
 786                                   gboolean           horizontal)
 787 {
 788   GtkAdjustment *adjustment = NULL;
 789
 790   switch (scroll)
 791     {
 792     case GTK_SCROLL_STEP_UP:
 793       scroll = GTK_SCROLL_STEP_BACKWARD;
 794       horizontal = FALSE;
 795       break;
 796     case GTK_SCROLL_STEP_DOWN:
 797       scroll = GTK_SCROLL_STEP_FORWARD;
 798       horizontal = FALSE;
 799       break;
 800     case GTK_SCROLL_STEP_LEFT:
 801       scroll = GTK_SCROLL_STEP_BACKWARD;
 802       horizontal = TRUE;
 803       break;
 804     case GTK_SCROLL_STEP_RIGHT:
 805       scroll = GTK_SCROLL_STEP_FORWARD;
 806       horizontal = TRUE;
 807       break;
 808     case GTK_SCROLL_PAGE_UP:
 809       scroll = GTK_SCROLL_PAGE_BACKWARD;
 810       horizontal = FALSE;
 811       break;
 812     case GTK_SCROLL_PAGE_DOWN:
 813       scroll = GTK_SCROLL_PAGE_FORWARD;
 814       horizontal = FALSE;
 815       break;
 816     case GTK_SCROLL_PAGE_LEFT:
 817       scroll = GTK_SCROLL_STEP_BACKWARD;
 818       horizontal = TRUE;
 819       break;
 820     case GTK_SCROLL_PAGE_RIGHT:
 821       scroll = GTK_SCROLL_STEP_FORWARD;
 822       horizontal = TRUE;
 823       break;
 824     case GTK_SCROLL_STEP_BACKWARD:
 825     case GTK_SCROLL_STEP_FORWARD:
 826     case GTK_SCROLL_PAGE_BACKWARD:
 827     case GTK_SCROLL_PAGE_FORWARD:
 828     case GTK_SCROLL_START:
 829     case GTK_SCROLL_END:
 830       break;
 831     default:
 832       g_warning ("Invalid scroll type %d for GtkSpinButton::change-value", scroll);
 833       return;
 834     }
 835
 836   if (horizontal)
 837     {
 838       if (scrolled_window->hscrollbar)
 839         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 840     }
 841   else
 842     {
 843       if (scrolled_window->vscrollbar)
 844         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 845     }
 846
 847   if (adjustment)
 848     {
 849       gdouble value = adjustment->value;
 850
 851       switch (scroll)
 852         {
 853         case GTK_SCROLL_STEP_FORWARD:
 854           value += adjustment->step_increment;
 855           break;
 856         case GTK_SCROLL_STEP_BACKWARD:
 857           value -= adjustment->step_increment;
 858           break;
 859         case GTK_SCROLL_PAGE_FORWARD:
 860           value += adjustment->page_increment;
 861           break;
 862         case GTK_SCROLL_PAGE_BACKWARD:
 863           value -= adjustment->page_increment;
 864           break;
 865         case GTK_SCROLL_START:
 866           value = adjustment->lower;
 867           break;
 868         case GTK_SCROLL_END:
 869           value = adjustment->upper;
 870           break;
 871         default:
 872           g_assert_not_reached ();
 873           break;
 874         }
 875
 876       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
 877
 878       gtk_adjustment_set_value (adjustment, value);
 879     }
 880 }
 881
 882 static void
 883 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
 884                                     GtkDirectionType   direction_type)
 885 {
 886   GtkWidget *toplevel;
 887
 888   /* Focus out of the scrolled window entirely. We do this by setting
 889    * a flag, then propagating the focus motion to the notebook.
 890    */
 891   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
 892   if (!GTK_WIDGET_TOPLEVEL (toplevel))
 893     return;
 894
 895   g_object_ref (scrolled_window);
 896
 897   scrolled_window->focus_out = TRUE;
 898   g_signal_emit_by_name (G_OBJECT (toplevel), "move_focus", direction_type);
 899   scrolled_window->focus_out = FALSE;
 900
 901   g_object_unref (scrolled_window);
 902 }
 903
 904 static void
 905 gtk_scrolled_window_size_request (GtkWidget      *widget,
 906                                   GtkRequisition *requisition)
 907 {
 908   GtkScrolledWindow *scrolled_window;
 909   GtkBin *bin;
 910   gint extra_width;
 911   gint extra_height;
 912   GtkRequisition hscrollbar_requisition;
 913   GtkRequisition vscrollbar_requisition;
 914   GtkRequisition child_requisition;
 915
 916   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 917   g_return_if_fail (requisition != NULL);
 918
 919   scrolled_window = GTK_SCROLLED_WINDOW (widget);
 920   bin = GTK_BIN (scrolled_window);
 921
 922   extra_width = 0;
 923   extra_height = 0;
 924   requisition->width = 0;
 925   requisition->height = 0;
 926
 927   gtk_widget_size_request (scrolled_window->hscrollbar,
 928                            &hscrollbar_requisition);
 929   gtk_widget_size_request (scrolled_window->vscrollbar,
 930                            &vscrollbar_requisition);
 931
 932   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 933     {
 934       gtk_widget_size_request (bin->child, &child_requisition);
 935
 936       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
 937         requisition->width += child_requisition.width;
 938       else
 939         {
 940           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 941
 942           if (aux_info && aux_info->width > 0)
 943             {
 944               requisition->width += aux_info->width;
 945               extra_width = -1;
 946             }
 947           else
 948             requisition->width += vscrollbar_requisition.width;
 949         }
 950
 951       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
 952         requisition->height += child_requisition.height;
 953       else
 954         {
 955           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 956
 957           if (aux_info && aux_info->height > 0)
 958             {
 959               requisition->height += aux_info->height;
 960               extra_height = -1;
 961             }
 962           else
 963             requisition->height += hscrollbar_requisition.height;
 964         }
 965     }
 966
 967   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
 968       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 969     {
 970       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
 971       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 972         extra_height = SCROLLBAR_SPACING (scrolled_window) + hscrollbar_requisition.height;
 973     }
 974
 975   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
 976       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 977     {
 978       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
 979       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 980         extra_width = SCROLLBAR_SPACING (scrolled_window) + vscrollbar_requisition.width;
 981     }
 982
 983   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
 984   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
 985
 986   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 987     {
 988       requisition->width += 2 * widget->style->xthickness;
 989       requisition->height += 2 * widget->style->ythickness;
 990     }
 991 }
 992
 993 static void
 994 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
 995                                          GtkAllocation *allocation)
 996 {
 997   GtkScrolledWindow *scrolled_window;
 998
 999   g_return_if_fail (widget != NULL);
1000   g_return_if_fail (allocation != NULL);
1001
1002   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1003
1004   allocation->x = GTK_CONTAINER (widget)->border_width;
1005   allocation->y = GTK_CONTAINER (widget)->border_width;
1006
1007   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1008     {
1009       allocation->x += widget->style->xthickness;
1010       allocation->y += widget->style->ythickness;
1011     }
1012
1013   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1014   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1015
1016   if (scrolled_window->vscrollbar_visible)
1017     {
1018       GtkRequisition vscrollbar_requisition;
1019       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1020                                         &vscrollbar_requisition);
1021
1022       if (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
1023           scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
1024         allocation->x += (vscrollbar_requisition.width +
1025                           SCROLLBAR_SPACING (scrolled_window));
1026
1027       allocation->width = MAX (1, (gint)allocation->width -
1028                                ((gint)vscrollbar_requisition.width +
1029                                 (gint)SCROLLBAR_SPACING (scrolled_window)));
1030     }
1031   if (scrolled_window->hscrollbar_visible)
1032     {
1033       GtkRequisition hscrollbar_requisition;
1034       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1035                                         &hscrollbar_requisition);
1036
1037       if (scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT ||
1038           scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
1039         allocation->y += (hscrollbar_requisition.height +
1040                           SCROLLBAR_SPACING (scrolled_window));
1041
1042       allocation->height = MAX (1, (gint)allocation->height -
1043                                 ((gint)hscrollbar_requisition.height +
1044                                  (gint)SCROLLBAR_SPACING (scrolled_window)));
1045     }
1046 }
1047
1048 static void
1049 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1050                                    GtkAllocation *allocation)
1051 {
1052   GtkScrolledWindow *scrolled_window;
1053   GtkBin *bin;
1054   GtkAllocation relative_allocation;
1055   GtkAllocation child_allocation;
1056
1057   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1058   g_return_if_fail (allocation != NULL);
1059
1060   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1061   bin = GTK_BIN (scrolled_window);
1062
1063   widget->allocation = *allocation;
1064
1065   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1066     scrolled_window->hscrollbar_visible = TRUE;
1067   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1068     scrolled_window->hscrollbar_visible = FALSE;
1069   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1070     scrolled_window->vscrollbar_visible = TRUE;
1071   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1072     scrolled_window->vscrollbar_visible = FALSE;
1073
1074   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1075     {
1076       gboolean previous_hvis;
1077       gboolean previous_vvis;
1078       guint count = 0;
1079
1080       do
1081         {
1082           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1083
1084           child_allocation.x = relative_allocation.x + allocation->x;
1085           child_allocation.y = relative_allocation.y + allocation->y;
1086           child_allocation.width = relative_allocation.width;
1087           child_allocation.height = relative_allocation.height;
1088
1089           previous_hvis = scrolled_window->hscrollbar_visible;
1090           previous_vvis = scrolled_window->vscrollbar_visible;
1091
1092           gtk_widget_size_allocate (bin->child, &child_allocation);
1093
1094           /* If, after the first iteration, the hscrollbar and the
1095            * vscrollbar flip visiblity, then we need both.
1096            */
1097           if (count &&
1098               previous_hvis != scrolled_window->hscrollbar_visible &&
1099               previous_vvis != scrolled_window->vscrollbar_visible)
1100             {
1101               scrolled_window->hscrollbar_visible = TRUE;
1102               scrolled_window->vscrollbar_visible = TRUE;
1103
1104               /* a new resize is already queued at this point,
1105                * so we will immediatedly get reinvoked
1106                */
1107               return;
1108             }
1109
1110           count++;
1111         }
1112       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1113              previous_vvis != scrolled_window->vscrollbar_visible);
1114     }
1115   else
1116     gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1117
1118   if (scrolled_window->hscrollbar_visible)
1119     {
1120       GtkRequisition hscrollbar_requisition;
1121       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1122                                         &hscrollbar_requisition);
1123
1124       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1125         gtk_widget_show (scrolled_window->hscrollbar);
1126
1127       child_allocation.x = relative_allocation.x;
1128       if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1129           scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT)
1130         child_allocation.y = (relative_allocation.y +
1131                               relative_allocation.height +
1132                               SCROLLBAR_SPACING (scrolled_window) +
1133                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1134                                0 : widget->style->ythickness));
1135       else
1136         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1137
1138       child_allocation.width = relative_allocation.width;
1139       child_allocation.height = hscrollbar_requisition.height;
1140       child_allocation.x += allocation->x;
1141       child_allocation.y += allocation->y;
1142
1143       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1144         {
1145           child_allocation.x -= widget->style->xthickness;
1146           child_allocation.width += 2 * widget->style->xthickness;
1147         }
1148
1149       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1150     }
1151   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1152     gtk_widget_hide (scrolled_window->hscrollbar);
1153
1154   if (scrolled_window->vscrollbar_visible)
1155     {
1156       GtkRequisition vscrollbar_requisition;
1157       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1158         gtk_widget_show (scrolled_window->vscrollbar);
1159
1160       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1161                                         &vscrollbar_requisition);
1162
1163       if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1164           scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)
1165         child_allocation.x = (relative_allocation.x +
1166                               relative_allocation.width +
1167                               SCROLLBAR_SPACING (scrolled_window) +
1168                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1169                                0 : widget->style->xthickness));
1170       else
1171         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1172
1173       child_allocation.y = relative_allocation.y;
1174       child_allocation.width = vscrollbar_requisition.width;
1175       child_allocation.height = relative_allocation.height;
1176       child_allocation.x += allocation->x;
1177       child_allocation.y += allocation->y;
1178
1179       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1180         {
1181           child_allocation.y -= widget->style->ythickness;
1182           child_allocation.height += 2 * widget->style->ythickness;
1183         }
1184
1185       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1186     }
1187   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1188     gtk_widget_hide (scrolled_window->vscrollbar);
1189 }
1190
1191 static gint
1192 gtk_scrolled_window_scroll_event (GtkWidget *widget,
1193                                   GdkEventScroll *event)
1194 {
1195   GtkWidget *range;
1196
1197   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1198   g_return_val_if_fail (event != NULL, FALSE);
1199
1200   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1201     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1202   else
1203     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1204
1205   if (range && GTK_WIDGET_VISIBLE (range))
1206     {
1207       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1208       gdouble new_value;
1209
1210       if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_LEFT)
1211         new_value = adj->value - adj->page_increment / 2;
1212       else
1213         new_value = adj->value + adj->page_increment / 2;
1214
1215       new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
1216       gtk_adjustment_set_value (adj, new_value);
1217
1218       return TRUE;
1219     }
1220
1221   return FALSE;
1222 }
1223
1224 static gint
1225 gtk_scrolled_window_focus (GtkWidget        *widget,
1226                            GtkDirectionType  direction)
1227 {
1228   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1229   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1230
1231   if (scrolled_window->focus_out)
1232     {
1233       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1234       return FALSE;
1235     }
1236
1237   if (gtk_widget_is_focus (widget))
1238     return FALSE;
1239
1240   /* We only put the scrolled window itself in the focus chain if it
1241    * isn't possible to focus any children.
1242    */
1243   if (GTK_BIN (widget)->child)
1244     {
1245       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1246         return TRUE;
1247     }
1248
1249   if (!had_focus_child)
1250     {
1251       gtk_widget_grab_focus (widget);
1252       return TRUE;
1253     }
1254   else
1255     return FALSE;
1256 }
1257
1258 static void
1259 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1260                                         gpointer       data)
1261 {
1262   GtkScrolledWindow *scrolled_win;
1263
1264   g_return_if_fail (adjustment != NULL);
1265   g_return_if_fail (data != NULL);
1266
1267   scrolled_win = GTK_SCROLLED_WINDOW (data);
1268
1269   if (scrolled_win->hscrollbar &&
1270       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1271     {
1272       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1273         {
1274           gboolean visible;
1275
1276           visible = scrolled_win->hscrollbar_visible;
1277           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1278                                               adjustment->page_size);
1279           if (scrolled_win->hscrollbar_visible != visible)
1280             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1281         }
1282     }
1283   else if (scrolled_win->vscrollbar &&
1284            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1285     {
1286       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1287         {
1288           gboolean visible;
1289
1290           visible = scrolled_win->vscrollbar_visible;
1291           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1292                                               adjustment->page_size);
1293           if (scrolled_win->vscrollbar_visible != visible)
1294             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1295         }
1296     }
1297 }
1298
1299 static void
1300 gtk_scrolled_window_add (GtkContainer *container,
1301                          GtkWidget    *child)
1302 {
1303   GtkScrolledWindow *scrolled_window;
1304   GtkBin *bin;
1305
1306   bin = GTK_BIN (container);
1307   g_return_if_fail (bin->child == NULL);
1308
1309   scrolled_window = GTK_SCROLLED_WINDOW (container);
1310
1311   bin->child = child;
1312   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1313
1314   /* this is a temporary message */
1315   if (!gtk_widget_set_scroll_adjustments (child,
1316                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1317                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1318     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1319                "use gtk_scrolled_window_add_with_viewport() instead");
1320 }
1321
1322 static void
1323 gtk_scrolled_window_remove (GtkContainer *container,
1324                             GtkWidget    *child)
1325 {
1326   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1327   g_return_if_fail (child != NULL);
1328   g_return_if_fail (GTK_BIN (container)->child == child);
1329
1330   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1331
1332   /* chain parent class handler to remove child */
1333   GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
1334 }
1335
1336 void
1337 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1338                                        GtkWidget         *child)
1339 {
1340   GtkBin *bin;
1341   GtkWidget *viewport;
1342
1343   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1344   g_return_if_fail (GTK_IS_WIDGET (child));
1345   g_return_if_fail (child->parent == NULL);
1346
1347   bin = GTK_BIN (scrolled_window);
1348
1349   if (bin->child != NULL)
1350     {
1351       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1352       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1353
1354       viewport = bin->child;
1355     }
1356   else
1357     {
1358       viewport =
1359         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1360                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1361       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1362     }
1363
1364   gtk_widget_show (viewport);
1365   gtk_container_add (GTK_CONTAINER (viewport), child);
1366 }