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 <config.h>
  28 #include <math.h>
  29 #include <gdk/gdkkeysyms.h>
  30 #include "gtkbindings.h"
  31 #include "gtkmarshalers.h"
  32 #include "gtkscrolledwindow.h"
  33 #include "gtkprivate.h"
  34 #include "gtkintl.h"
  35 #include "gtkalias.h"
  36
  37
  38 /* scrolled window policy and size requisition handling:
  39  *
  40  * gtk size requisition works as follows:
  41  *   a widget upon size-request reports the width and height that it finds
  42  *   to be best suited to display its contents, including children.
  43  *   the width and/or height reported from a widget upon size requisition
  44  *   may be overidden by the user by specifying a width and/or height
  45  *   other than 0 through gtk_widget_set_usize().
  46  *
  47  * a scrolled window needs (for imlementing all three policy types) to
  48  * request its width and height based on two different rationales.
  49  * 1)   the user wants the scrolled window to just fit into the space
  50  *      that it gets allocated for a specifc dimension.
  51  * 1.1) this does not apply if the user specified a concrete value
  52  *      value for that specific dimension by either specifying usize for the
  53  *      scrolled window or for its child.
  54  * 2)   the user wants the scrolled window to take as much space up as
  55  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
  56  *
  57  * also, kinda obvious:
  58  * 3)   a user would certainly not have choosen a scrolled window as a container
  59  *      for the child, if the resulting allocation takes up more space than the
  60  *      child would have allocated without the scrolled window.
  61  *
  62  * conclusions:
  63  * A) from 1) follows: the scrolled window shouldn't request more space for a
  64  *    specifc dimension than is required at minimum.
  65  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
  66  *    window (done automatically) or by usize of the child (needs to be checked).
  67  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
  68  *    child's dimension.
  69  * D) from 3) follows: the scrolled window child's minimum width and minimum height
  70  *    under A) at least correspond to the space taken up by its scrollbars.
  71  */
  72
  73 #define DEFAULT_SCROLLBAR_SPACING  3
  74
  75 enum {
  76   PROP_0,
  77   PROP_HADJUSTMENT,
  78   PROP_VADJUSTMENT,
  79   PROP_HSCROLLBAR_POLICY,
  80   PROP_VSCROLLBAR_POLICY,
  81   PROP_WINDOW_PLACEMENT,
  82   PROP_SHADOW_TYPE,
  83   PROP_LAST
  84 };
  85
  86 /* Signals */
  87 enum
  88 {
  89   SCROLL_CHILD,
  90   MOVE_FOCUS_OUT,
  91   LAST_SIGNAL
  92 };
  93
  94 static void gtk_scrolled_window_class_init         (GtkScrolledWindowClass *klass);
  95 static void gtk_scrolled_window_init               (GtkScrolledWindow      *scrolled_window);
  96 static void gtk_scrolled_window_destroy            (GtkObject              *object);
  97 static void gtk_scrolled_window_finalize           (GObject                *object);
  98 static void gtk_scrolled_window_set_property       (GObject                *object,
  99                                                     guint                   prop_id,
 100                                                     const GValue           *value,
 101                                                     GParamSpec             *pspec);
 102 static void gtk_scrolled_window_get_property       (GObject                *object,
 103                                                     guint                   prop_id,
 104                                                     GValue                 *value,
 105                                                     GParamSpec             *pspec);
 106
 107 static gint gtk_scrolled_window_expose             (GtkWidget              *widget,
 108                                                     GdkEventExpose         *event);
 109 static void gtk_scrolled_window_size_request       (GtkWidget              *widget,
 110                                                     GtkRequisition         *requisition);
 111 static void gtk_scrolled_window_size_allocate      (GtkWidget              *widget,
 112                                                     GtkAllocation          *allocation);
 113 static gint gtk_scrolled_window_scroll_event       (GtkWidget              *widget,
 114                                                     GdkEventScroll         *event);
 115 static gint gtk_scrolled_window_focus              (GtkWidget              *widget,
 116                                                     GtkDirectionType        direction);
 117 static void gtk_scrolled_window_add                (GtkContainer           *container,
 118                                                     GtkWidget              *widget);
 119 static void gtk_scrolled_window_remove             (GtkContainer           *container,
 120                                                     GtkWidget              *widget);
 121 static void gtk_scrolled_window_forall             (GtkContainer           *container,
 122                                                     gboolean                include_internals,
 123                                                     GtkCallback             callback,
 124                                                     gpointer                callback_data);
 125 static void gtk_scrolled_window_scroll_child       (GtkScrolledWindow      *scrolled_window,
 126                                                     GtkScrollType           scroll,
 127                                                     gboolean                horizontal);
 128 static void gtk_scrolled_window_move_focus_out     (GtkScrolledWindow      *scrolled_window,
 129                                                     GtkDirectionType        direction_type);
 130
 131 static void gtk_scrolled_window_relative_allocation(GtkWidget              *widget,
 132                                                     GtkAllocation          *allocation);
 133 static void gtk_scrolled_window_adjustment_changed (GtkAdjustment          *adjustment,
 134                                                     gpointer                data);
 135
 136 static GtkContainerClass *parent_class = NULL;
 137
 138 static guint signals[LAST_SIGNAL] = {0};
 139
 140 GType
 141 gtk_scrolled_window_get_type (void)
 142 {
 143   static GType scrolled_window_type = 0;
 144
 145   if (!scrolled_window_type)
 146     {
 147       static const GTypeInfo scrolled_window_info =
 148       {
 149         sizeof (GtkScrolledWindowClass),
 150         NULL,           /* base_init */
 151         NULL,           /* base_finalize */
 152         (GClassInitFunc) gtk_scrolled_window_class_init,
 153         NULL,           /* class_finalize */
 154         NULL,           /* class_data */
 155         sizeof (GtkScrolledWindow),
 156         0,              /* n_preallocs */
 157         (GInstanceInitFunc) gtk_scrolled_window_init,
 158       };
 159
 160       scrolled_window_type =
 161         g_type_register_static (GTK_TYPE_BIN, "GtkScrolledWindow",
 162                                 &scrolled_window_info, 0);
 163     }
 164
 165   return scrolled_window_type;
 166 }
 167
 168 static void
 169 add_scroll_binding (GtkBindingSet  *binding_set,
 170                     guint           keyval,
 171                     GdkModifierType mask,
 172                     GtkScrollType   scroll,
 173                     gboolean        horizontal)
 174 {
 175   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 176
 177   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 178                                 "scroll_child", 2,
 179                                 GTK_TYPE_SCROLL_TYPE, scroll,
 180                                 G_TYPE_BOOLEAN, horizontal);
 181   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 182                                 "scroll_child", 2,
 183                                 GTK_TYPE_SCROLL_TYPE, scroll,
 184                                 G_TYPE_BOOLEAN, horizontal);
 185 }
 186
 187 static void
 188 add_tab_bindings (GtkBindingSet    *binding_set,
 189                   GdkModifierType   modifiers,
 190                   GtkDirectionType  direction)
 191 {
 192   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 193                                 "move_focus_out", 1,
 194                                 GTK_TYPE_DIRECTION_TYPE, direction);
 195   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 196                                 "move_focus_out", 1,
 197                                 GTK_TYPE_DIRECTION_TYPE, direction);
 198 }
 199
 200 static void
 201 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 202 {
 203   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 204   GtkObjectClass *object_class;
 205   GtkWidgetClass *widget_class;
 206   GtkContainerClass *container_class;
 207   GtkBindingSet *binding_set;
 208
 209   object_class = (GtkObjectClass*) class;
 210   widget_class = (GtkWidgetClass*) class;
 211   container_class = (GtkContainerClass*) class;
 212
 213   parent_class = g_type_class_peek_parent (class);
 214
 215   gobject_class->finalize = gtk_scrolled_window_finalize;
 216   gobject_class->set_property = gtk_scrolled_window_set_property;
 217   gobject_class->get_property = gtk_scrolled_window_get_property;
 218
 219   object_class->destroy = gtk_scrolled_window_destroy;
 220
 221   widget_class->expose_event = gtk_scrolled_window_expose;
 222   widget_class->size_request = gtk_scrolled_window_size_request;
 223   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 224   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 225   widget_class->focus = gtk_scrolled_window_focus;
 226
 227   container_class->add = gtk_scrolled_window_add;
 228   container_class->remove = gtk_scrolled_window_remove;
 229   container_class->forall = gtk_scrolled_window_forall;
 230
 231   class->scrollbar_spacing = -1;
 232
 233   class->scroll_child = gtk_scrolled_window_scroll_child;
 234   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 235
 236   g_object_class_install_property (gobject_class,
 237                                    PROP_HADJUSTMENT,
 238                                    g_param_spec_object ("hadjustment",
 239                                                         P_("Horizontal Adjustment"),
 240                                                         P_("The GtkAdjustment for the horizontal position"),
 241                                                         GTK_TYPE_ADJUSTMENT,
 242                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 243   g_object_class_install_property (gobject_class,
 244                                    PROP_VADJUSTMENT,
 245                                    g_param_spec_object ("vadjustment",
 246                                                         P_("Vertical Adjustment"),
 247                                                         P_("The GtkAdjustment for the vertical position"),
 248                                                         GTK_TYPE_ADJUSTMENT,
 249                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 250   g_object_class_install_property (gobject_class,
 251                                    PROP_HSCROLLBAR_POLICY,
 252                                    g_param_spec_enum ("hscrollbar-policy",
 253                                                       P_("Horizontal Scrollbar Policy"),
 254                                                       P_("When the horizontal scrollbar is displayed"),
 255                                                       GTK_TYPE_POLICY_TYPE,
 256                                                       GTK_POLICY_ALWAYS,
 257                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 258   g_object_class_install_property (gobject_class,
 259                                    PROP_VSCROLLBAR_POLICY,
 260                                    g_param_spec_enum ("vscrollbar-policy",
 261                                                       P_("Vertical Scrollbar Policy"),
 262                                                       P_("When the vertical scrollbar is displayed"),
 263                                                       GTK_TYPE_POLICY_TYPE,
 264                                                       GTK_POLICY_ALWAYS,
 265                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 266
 267   g_object_class_install_property (gobject_class,
 268                                    PROP_WINDOW_PLACEMENT,
 269                                    g_param_spec_enum ("window-placement",
 270                                                       P_("Window Placement"),
 271                                                       P_("Where the contents are located with respect to the scrollbars"),
 272                                                       GTK_TYPE_CORNER_TYPE,
 273                                                       GTK_CORNER_TOP_LEFT,
 274                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 275   g_object_class_install_property (gobject_class,
 276                                    PROP_SHADOW_TYPE,
 277                                    g_param_spec_enum ("shadow-type",
 278                                                       P_("Shadow Type"),
 279                                                       P_("Style of bevel around the contents"),
 280                                                       GTK_TYPE_SHADOW_TYPE,
 281                                                       GTK_SHADOW_NONE,
 282                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 283
 284   gtk_widget_class_install_style_property (widget_class,
 285                                            g_param_spec_int ("scrollbar-spacing",
 286                                                              P_("Scrollbar spacing"),
 287                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 288                                                              0,
 289                                                              G_MAXINT,
 290                                                              DEFAULT_SCROLLBAR_SPACING,
 291                                                              GTK_PARAM_READABLE));
 292
 293   signals[SCROLL_CHILD] =
 294     g_signal_new ("scroll_child",
 295                   G_TYPE_FROM_CLASS (object_class),
 296                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 297                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 298                   NULL, NULL,
 299                   _gtk_marshal_VOID__ENUM_BOOLEAN,
 300                   G_TYPE_NONE, 2,
 301                   GTK_TYPE_SCROLL_TYPE,
 302                   G_TYPE_BOOLEAN);
 303   signals[MOVE_FOCUS_OUT] =
 304     g_signal_new ("move_focus_out",
 305                   G_TYPE_FROM_CLASS (object_class),
 306                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 307                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 308                   NULL, NULL,
 309                   _gtk_marshal_VOID__ENUM,
 310                   G_TYPE_NONE, 1,
 311                   GTK_TYPE_DIRECTION_TYPE);
 312
 313   binding_set = gtk_binding_set_by_class (class);
 314
 315   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 316   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 317   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 318   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 319
 320   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 321   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 322   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 323   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 324
 325   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 326   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 327   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 328   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 329
 330   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 331   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 332 }
 333
 334 static void
 335 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 336 {
 337   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 338
 339   scrolled_window->hscrollbar = NULL;
 340   scrolled_window->vscrollbar = NULL;
 341   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 342   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 343   scrolled_window->hscrollbar_visible = FALSE;
 344   scrolled_window->vscrollbar_visible = FALSE;
 345   scrolled_window->focus_out = FALSE;
 346   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 347
 348 }
 349
 350 GtkWidget*
 351 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 352                          GtkAdjustment *vadjustment)
 353 {
 354   GtkWidget *scrolled_window;
 355
 356   if (hadjustment)
 357     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 358
 359   if (vadjustment)
 360     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 361
 362   scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
 363                                     "hadjustment", hadjustment,
 364                                     "vadjustment", vadjustment,
 365                                     NULL);
 366
 367   return scrolled_window;
 368 }
 369
 370 void
 371 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 372                                      GtkAdjustment     *hadjustment)
 373 {
 374   GtkBin *bin;
 375
 376   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 377   if (hadjustment)
 378     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 379   else
 380     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 381
 382   bin = GTK_BIN (scrolled_window);
 383
 384   if (!scrolled_window->hscrollbar)
 385     {
 386       gtk_widget_push_composite_child ();
 387       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 388       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 389       gtk_widget_pop_composite_child ();
 390
 391       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 392       g_object_ref (scrolled_window->hscrollbar);
 393       gtk_widget_show (scrolled_window->hscrollbar);
 394     }
 395   else
 396     {
 397       GtkAdjustment *old_adjustment;
 398
 399       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 400       if (old_adjustment == hadjustment)
 401         return;
 402
 403       g_signal_handlers_disconnect_by_func (old_adjustment,
 404                                             gtk_scrolled_window_adjustment_changed,
 405                                             scrolled_window);
 406       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 407                                 hadjustment);
 408     }
 409   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 410   g_signal_connect (hadjustment,
 411                     "changed",
 412                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 413                     scrolled_window);
 414   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 415
 416   if (bin->child)
 417     gtk_widget_set_scroll_adjustments (bin->child,
 418                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 419                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 420
 421   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 422 }
 423
 424 void
 425 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 426                                      GtkAdjustment     *vadjustment)
 427 {
 428   GtkBin *bin;
 429
 430   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 431   if (vadjustment)
 432     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 433   else
 434     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 435
 436   bin = GTK_BIN (scrolled_window);
 437
 438   if (!scrolled_window->vscrollbar)
 439     {
 440       gtk_widget_push_composite_child ();
 441       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 442       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 443       gtk_widget_pop_composite_child ();
 444
 445       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 446       g_object_ref (scrolled_window->vscrollbar);
 447       gtk_widget_show (scrolled_window->vscrollbar);
 448     }
 449   else
 450     {
 451       GtkAdjustment *old_adjustment;
 452
 453       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 454       if (old_adjustment == vadjustment)
 455         return;
 456
 457       g_signal_handlers_disconnect_by_func (old_adjustment,
 458                                             gtk_scrolled_window_adjustment_changed,
 459                                             scrolled_window);
 460       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 461                                 vadjustment);
 462     }
 463   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 464   g_signal_connect (vadjustment,
 465                     "changed",
 466                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 467                     scrolled_window);
 468   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 469
 470   if (bin->child)
 471     gtk_widget_set_scroll_adjustments (bin->child,
 472                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 473                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 474
 475   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 476 }
 477
 478 GtkAdjustment*
 479 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 480 {
 481   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 482
 483   return (scrolled_window->hscrollbar ?
 484           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 485           NULL);
 486 }
 487
 488 GtkAdjustment*
 489 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 490 {
 491   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 492
 493   return (scrolled_window->vscrollbar ?
 494           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 495           NULL);
 496 }
 497
 498 /**
 499  * gtk_scrolled_window_get_hscrollbar:
 500  * @scrolled_window: a #GtkScrolledWindow
 501  *
 502  * Returns the horizontal scrollbar of @scrolled_window.
 503  *
 504  * Returns: the horizontal scrollbar of the scrolled window, or
 505  *  %NULL if it does not have one.
 506  *
 507  * Since: 2.8
 508  */
 509 GtkHScrollbar*
 510 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 511 {
 512   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 513
 514   return scrolled_window->hscrollbar;
 515 }
 516
 517 /**
 518  * gtk_scrolled_window_get_vscrollbar:
 519  * @scrolled_window: a #GtkScrolledWindow
 520  *
 521  * Returns the vertical scrollbar of @scrolled_window.
 522  *
 523  * Returns: the vertical scrollbar of the scrolled window, or
 524  *  %NULL if it does not have one.
 525  *
 526  * Since: 2.8
 527  */
 528 GtkVScrollbar*
 529 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 530 {
 531   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 532
 533   return scrolled_window->vscrollbar;
 534 }
 535
 536 void
 537 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 538                                 GtkPolicyType      hscrollbar_policy,
 539                                 GtkPolicyType      vscrollbar_policy)
 540 {
 541   GObject *object = G_OBJECT (scrolled_window);
 542
 543   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 544
 545   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 546       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 547     {
 548       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 549       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 550
 551       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 552
 553       g_object_freeze_notify (object);
 554       g_object_notify (object, "hscrollbar-policy");
 555       g_object_notify (object, "vscrollbar-policy");
 556       g_object_thaw_notify (object);
 557     }
 558 }
 559
 560 /**
 561  * gtk_scrolled_window_get_policy:
 562  * @scrolled_window: a #GtkScrolledWindow
 563  * @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 564  * @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 565  *
 566  * Retrieves the current policy values for the horizontal and vertical
 567  * scrollbars. See gtk_scrolled_window_set_policy().
 568  **/
 569 void
 570 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 571                                 GtkPolicyType     *hscrollbar_policy,
 572                                 GtkPolicyType     *vscrollbar_policy)
 573 {
 574   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 575
 576   if (hscrollbar_policy)
 577     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 578   if (vscrollbar_policy)
 579     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 580 }
 581
 582 void
 583 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 584                                    GtkCornerType      window_placement)
 585 {
 586   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 587
 588   if (scrolled_window->window_placement != window_placement)
 589     {
 590       scrolled_window->window_placement = window_placement;
 591
 592       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 593
 594       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 595     }
 596 }
 597
 598 /**
 599  * gtk_scrolled_window_get_placement:
 600  * @scrolled_window: a #GtkScrolledWindow
 601  *
 602  * Gets the placement of the scrollbars for the scrolled window. See
 603  * gtk_scrolled_window_set_placement().
 604  *
 605  * Return value: the current placement value.
 606  **/
 607 GtkCornerType
 608 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 609 {
 610   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 611
 612   return scrolled_window->window_placement;
 613 }
 614
 615 /**
 616  * gtk_scrolled_window_set_shadow_type:
 617  * @scrolled_window: a #GtkScrolledWindow
 618  * @type: kind of shadow to draw around scrolled window contents
 619  *
 620  * Changes the type of shadow drawn around the contents of
 621  * @scrolled_window.
 622  *
 623  **/
 624 void
 625 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 626                                      GtkShadowType      type)
 627 {
 628   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 629   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 630
 631   if (scrolled_window->shadow_type != type)
 632     {
 633       scrolled_window->shadow_type = type;
 634
 635       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 636         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 637
 638       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 639
 640       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 641     }
 642 }
 643
 644 /**
 645  * gtk_scrolled_window_get_shadow_type:
 646  * @scrolled_window: a #GtkScrolledWindow
 647  *
 648  * Gets the shadow type of the scrolled window. See
 649  * gtk_scrolled_window_set_shadow_type().
 650  *
 651  * Return value: the current shadow type
 652  **/
 653 GtkShadowType
 654 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 655 {
 656   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 657
 658   return scrolled_window->shadow_type;
 659 }
 660
 661 static void
 662 gtk_scrolled_window_destroy (GtkObject *object)
 663 {
 664   GtkScrolledWindow *scrolled_window;
 665
 666   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
 667
 668   scrolled_window = GTK_SCROLLED_WINDOW (object);
 669
 670   gtk_widget_unparent (scrolled_window->hscrollbar);
 671   gtk_widget_unparent (scrolled_window->vscrollbar);
 672   gtk_widget_destroy (scrolled_window->hscrollbar);
 673   gtk_widget_destroy (scrolled_window->vscrollbar);
 674
 675   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 676 }
 677
 678 static void
 679 gtk_scrolled_window_finalize (GObject *object)
 680 {
 681   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 682
 683   g_object_unref (scrolled_window->hscrollbar);
 684   g_object_unref (scrolled_window->vscrollbar);
 685
 686   G_OBJECT_CLASS (parent_class)->finalize (object);
 687 }
 688
 689 static void
 690 gtk_scrolled_window_set_property (GObject      *object,
 691                                   guint         prop_id,
 692                                   const GValue *value,
 693                                   GParamSpec   *pspec)
 694 {
 695   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 696
 697   switch (prop_id)
 698     {
 699     case PROP_HADJUSTMENT:
 700       gtk_scrolled_window_set_hadjustment (scrolled_window,
 701                                            g_value_get_object (value));
 702       break;
 703     case PROP_VADJUSTMENT:
 704       gtk_scrolled_window_set_vadjustment (scrolled_window,
 705                                            g_value_get_object (value));
 706       break;
 707     case PROP_HSCROLLBAR_POLICY:
 708       gtk_scrolled_window_set_policy (scrolled_window,
 709                                       g_value_get_enum (value),
 710                                       scrolled_window->vscrollbar_policy);
 711       break;
 712     case PROP_VSCROLLBAR_POLICY:
 713       gtk_scrolled_window_set_policy (scrolled_window,
 714                                       scrolled_window->hscrollbar_policy,
 715                                       g_value_get_enum (value));
 716       break;
 717     case PROP_WINDOW_PLACEMENT:
 718       gtk_scrolled_window_set_placement (scrolled_window,
 719                                          g_value_get_enum (value));
 720       break;
 721     case PROP_SHADOW_TYPE:
 722       gtk_scrolled_window_set_shadow_type (scrolled_window,
 723                                            g_value_get_enum (value));
 724       break;
 725     default:
 726       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 727       break;
 728     }
 729 }
 730
 731 static void
 732 gtk_scrolled_window_get_property (GObject    *object,
 733                                   guint       prop_id,
 734                                   GValue     *value,
 735                                   GParamSpec *pspec)
 736 {
 737   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 738
 739   switch (prop_id)
 740     {
 741     case PROP_HADJUSTMENT:
 742       g_value_set_object (value,
 743                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 744       break;
 745     case PROP_VADJUSTMENT:
 746       g_value_set_object (value,
 747                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 748       break;
 749     case PROP_HSCROLLBAR_POLICY:
 750       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 751       break;
 752     case PROP_VSCROLLBAR_POLICY:
 753       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 754       break;
 755     case PROP_WINDOW_PLACEMENT:
 756       g_value_set_enum (value, scrolled_window->window_placement);
 757       break;
 758     case PROP_SHADOW_TYPE:
 759       g_value_set_enum (value, scrolled_window->shadow_type);
 760       break;
 761     default:
 762       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 763       break;
 764     }
 765 }
 766
 767 static void
 768 gtk_scrolled_window_paint (GtkWidget    *widget,
 769                            GdkRectangle *area)
 770 {
 771   GtkAllocation relative_allocation;
 772   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 773
 774   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 775     {
 776       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
 777
 778       relative_allocation.x -= widget->style->xthickness;
 779       relative_allocation.y -= widget->style->ythickness;
 780       relative_allocation.width += 2 * widget->style->xthickness;
 781       relative_allocation.height += 2 * widget->style->ythickness;
 782
 783       gtk_paint_shadow (widget->style, widget->window,
 784                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
 785                         area, widget, "scrolled_window",
 786                         widget->allocation.x + relative_allocation.x,
 787                         widget->allocation.y + relative_allocation.y,
 788                         relative_allocation.width,
 789                         relative_allocation.height);
 790     }
 791 }
 792
 793 static gint
 794 gtk_scrolled_window_expose (GtkWidget      *widget,
 795                             GdkEventExpose *event)
 796 {
 797   if (GTK_WIDGET_DRAWABLE (widget))
 798     {
 799       gtk_scrolled_window_paint (widget, &event->area);
 800
 801       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 802     }
 803
 804   return FALSE;
 805 }
 806
 807 static void
 808 gtk_scrolled_window_forall (GtkContainer *container,
 809                             gboolean      include_internals,
 810                             GtkCallback   callback,
 811                             gpointer      callback_data)
 812 {
 813   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 814   g_return_if_fail (callback != NULL);
 815
 816   GTK_CONTAINER_CLASS (parent_class)->forall (container,
 817                                               include_internals,
 818                                               callback,
 819                                               callback_data);
 820   if (include_internals)
 821     {
 822       GtkScrolledWindow *scrolled_window;
 823
 824       scrolled_window = GTK_SCROLLED_WINDOW (container);
 825
 826       if (scrolled_window->vscrollbar)
 827         callback (scrolled_window->vscrollbar, callback_data);
 828       if (scrolled_window->hscrollbar)
 829         callback (scrolled_window->hscrollbar, callback_data);
 830     }
 831 }
 832
 833 static void
 834 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
 835                                   GtkScrollType      scroll,
 836                                   gboolean           horizontal)
 837 {
 838   GtkAdjustment *adjustment = NULL;
 839
 840   switch (scroll)
 841     {
 842     case GTK_SCROLL_STEP_UP:
 843       scroll = GTK_SCROLL_STEP_BACKWARD;
 844       horizontal = FALSE;
 845       break;
 846     case GTK_SCROLL_STEP_DOWN:
 847       scroll = GTK_SCROLL_STEP_FORWARD;
 848       horizontal = FALSE;
 849       break;
 850     case GTK_SCROLL_STEP_LEFT:
 851       scroll = GTK_SCROLL_STEP_BACKWARD;
 852       horizontal = TRUE;
 853       break;
 854     case GTK_SCROLL_STEP_RIGHT:
 855       scroll = GTK_SCROLL_STEP_FORWARD;
 856       horizontal = TRUE;
 857       break;
 858     case GTK_SCROLL_PAGE_UP:
 859       scroll = GTK_SCROLL_PAGE_BACKWARD;
 860       horizontal = FALSE;
 861       break;
 862     case GTK_SCROLL_PAGE_DOWN:
 863       scroll = GTK_SCROLL_PAGE_FORWARD;
 864       horizontal = FALSE;
 865       break;
 866     case GTK_SCROLL_PAGE_LEFT:
 867       scroll = GTK_SCROLL_STEP_BACKWARD;
 868       horizontal = TRUE;
 869       break;
 870     case GTK_SCROLL_PAGE_RIGHT:
 871       scroll = GTK_SCROLL_STEP_FORWARD;
 872       horizontal = TRUE;
 873       break;
 874     case GTK_SCROLL_STEP_BACKWARD:
 875     case GTK_SCROLL_STEP_FORWARD:
 876     case GTK_SCROLL_PAGE_BACKWARD:
 877     case GTK_SCROLL_PAGE_FORWARD:
 878     case GTK_SCROLL_START:
 879     case GTK_SCROLL_END:
 880       break;
 881     default:
 882       g_warning ("Invalid scroll type %d for GtkSpinButton::change-value", scroll);
 883       return;
 884     }
 885
 886   if (horizontal)
 887     {
 888       if (scrolled_window->hscrollbar)
 889         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 890     }
 891   else
 892     {
 893       if (scrolled_window->vscrollbar)
 894         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 895     }
 896
 897   if (adjustment)
 898     {
 899       gdouble value = adjustment->value;
 900
 901       switch (scroll)
 902         {
 903         case GTK_SCROLL_STEP_FORWARD:
 904           value += adjustment->step_increment;
 905           break;
 906         case GTK_SCROLL_STEP_BACKWARD:
 907           value -= adjustment->step_increment;
 908           break;
 909         case GTK_SCROLL_PAGE_FORWARD:
 910           value += adjustment->page_increment;
 911           break;
 912         case GTK_SCROLL_PAGE_BACKWARD:
 913           value -= adjustment->page_increment;
 914           break;
 915         case GTK_SCROLL_START:
 916           value = adjustment->lower;
 917           break;
 918         case GTK_SCROLL_END:
 919           value = adjustment->upper;
 920           break;
 921         default:
 922           g_assert_not_reached ();
 923           break;
 924         }
 925
 926       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
 927
 928       gtk_adjustment_set_value (adjustment, value);
 929     }
 930 }
 931
 932 static void
 933 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
 934                                     GtkDirectionType   direction_type)
 935 {
 936   GtkWidget *toplevel;
 937
 938   /* Focus out of the scrolled window entirely. We do this by setting
 939    * a flag, then propagating the focus motion to the notebook.
 940    */
 941   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
 942   if (!GTK_WIDGET_TOPLEVEL (toplevel))
 943     return;
 944
 945   g_object_ref (scrolled_window);
 946
 947   scrolled_window->focus_out = TRUE;
 948   g_signal_emit_by_name (toplevel, "move_focus", direction_type);
 949   scrolled_window->focus_out = FALSE;
 950
 951   g_object_unref (scrolled_window);
 952 }
 953
 954 static void
 955 gtk_scrolled_window_size_request (GtkWidget      *widget,
 956                                   GtkRequisition *requisition)
 957 {
 958   GtkScrolledWindow *scrolled_window;
 959   GtkBin *bin;
 960   gint extra_width;
 961   gint extra_height;
 962   gint scrollbar_spacing;
 963   GtkRequisition hscrollbar_requisition;
 964   GtkRequisition vscrollbar_requisition;
 965   GtkRequisition child_requisition;
 966
 967   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 968   g_return_if_fail (requisition != NULL);
 969
 970   scrolled_window = GTK_SCROLLED_WINDOW (widget);
 971   bin = GTK_BIN (scrolled_window);
 972
 973   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
 974
 975   extra_width = 0;
 976   extra_height = 0;
 977   requisition->width = 0;
 978   requisition->height = 0;
 979
 980   gtk_widget_size_request (scrolled_window->hscrollbar,
 981                            &hscrollbar_requisition);
 982   gtk_widget_size_request (scrolled_window->vscrollbar,
 983                            &vscrollbar_requisition);
 984
 985   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 986     {
 987       gtk_widget_size_request (bin->child, &child_requisition);
 988
 989       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
 990         requisition->width += child_requisition.width;
 991       else
 992         {
 993           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 994
 995           if (aux_info && aux_info->width > 0)
 996             {
 997               requisition->width += aux_info->width;
 998               extra_width = -1;
 999             }
1000           else
1001             requisition->width += vscrollbar_requisition.width;
1002         }
1003
1004       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1005         requisition->height += child_requisition.height;
1006       else
1007         {
1008           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1009
1010           if (aux_info && aux_info->height > 0)
1011             {
1012               requisition->height += aux_info->height;
1013               extra_height = -1;
1014             }
1015           else
1016             requisition->height += hscrollbar_requisition.height;
1017         }
1018     }
1019
1020   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1021       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1022     {
1023       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
1024       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1025         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1026     }
1027
1028   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1029       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1030     {
1031       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
1032       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1033         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1034     }
1035
1036   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
1037   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
1038
1039   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1040     {
1041       requisition->width += 2 * widget->style->xthickness;
1042       requisition->height += 2 * widget->style->ythickness;
1043     }
1044 }
1045
1046 static void
1047 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1048                                          GtkAllocation *allocation)
1049 {
1050   GtkScrolledWindow *scrolled_window;
1051   gint scrollbar_spacing;
1052
1053   g_return_if_fail (widget != NULL);
1054   g_return_if_fail (allocation != NULL);
1055
1056   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1057   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1058
1059   allocation->x = GTK_CONTAINER (widget)->border_width;
1060   allocation->y = GTK_CONTAINER (widget)->border_width;
1061
1062   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1063     {
1064       allocation->x += widget->style->xthickness;
1065       allocation->y += widget->style->ythickness;
1066     }
1067
1068   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1069   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1070
1071   if (scrolled_window->vscrollbar_visible)
1072     {
1073       GtkRequisition vscrollbar_requisition;
1074       gboolean is_rtl;
1075
1076       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1077                                         &vscrollbar_requisition);
1078       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1079
1080       if ((!is_rtl &&
1081            (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
1082             scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1083           (is_rtl &&
1084            (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1085             scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)))
1086         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1087
1088       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1089     }
1090   if (scrolled_window->hscrollbar_visible)
1091     {
1092       GtkRequisition hscrollbar_requisition;
1093       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1094                                         &hscrollbar_requisition);
1095
1096       if (scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT ||
1097           scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
1098         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1099
1100       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1101     }
1102 }
1103
1104 static void
1105 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1106                                    GtkAllocation *allocation)
1107 {
1108   GtkScrolledWindow *scrolled_window;
1109   GtkBin *bin;
1110   GtkAllocation relative_allocation;
1111   GtkAllocation child_allocation;
1112   gint scrollbar_spacing;
1113
1114   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1115   g_return_if_fail (allocation != NULL);
1116
1117   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1118   bin = GTK_BIN (scrolled_window);
1119
1120   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1121
1122   widget->allocation = *allocation;
1123
1124   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1125     scrolled_window->hscrollbar_visible = TRUE;
1126   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1127     scrolled_window->hscrollbar_visible = FALSE;
1128   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1129     scrolled_window->vscrollbar_visible = TRUE;
1130   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1131     scrolled_window->vscrollbar_visible = FALSE;
1132
1133   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1134     {
1135       gboolean previous_hvis;
1136       gboolean previous_vvis;
1137       guint count = 0;
1138
1139       do
1140         {
1141           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1142
1143           child_allocation.x = relative_allocation.x + allocation->x;
1144           child_allocation.y = relative_allocation.y + allocation->y;
1145           child_allocation.width = relative_allocation.width;
1146           child_allocation.height = relative_allocation.height;
1147
1148           previous_hvis = scrolled_window->hscrollbar_visible;
1149           previous_vvis = scrolled_window->vscrollbar_visible;
1150
1151           gtk_widget_size_allocate (bin->child, &child_allocation);
1152
1153           /* If, after the first iteration, the hscrollbar and the
1154            * vscrollbar flip visiblity, then we need both.
1155            */
1156           if (count &&
1157               previous_hvis != scrolled_window->hscrollbar_visible &&
1158               previous_vvis != scrolled_window->vscrollbar_visible)
1159             {
1160               scrolled_window->hscrollbar_visible = TRUE;
1161               scrolled_window->vscrollbar_visible = TRUE;
1162
1163               /* a new resize is already queued at this point,
1164                * so we will immediatedly get reinvoked
1165                */
1166               return;
1167             }
1168
1169           count++;
1170         }
1171       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1172              previous_vvis != scrolled_window->vscrollbar_visible);
1173     }
1174   else
1175     gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1176
1177   if (scrolled_window->hscrollbar_visible)
1178     {
1179       GtkRequisition hscrollbar_requisition;
1180       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1181                                         &hscrollbar_requisition);
1182
1183       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1184         gtk_widget_show (scrolled_window->hscrollbar);
1185
1186       child_allocation.x = relative_allocation.x;
1187       if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1188           scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT)
1189         child_allocation.y = (relative_allocation.y +
1190                               relative_allocation.height +
1191                               scrollbar_spacing +
1192                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1193                                0 : widget->style->ythickness));
1194       else
1195         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1196
1197       child_allocation.width = relative_allocation.width;
1198       child_allocation.height = hscrollbar_requisition.height;
1199       child_allocation.x += allocation->x;
1200       child_allocation.y += allocation->y;
1201
1202       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1203         {
1204           child_allocation.x -= widget->style->xthickness;
1205           child_allocation.width += 2 * widget->style->xthickness;
1206         }
1207
1208       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1209     }
1210   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1211     gtk_widget_hide (scrolled_window->hscrollbar);
1212
1213   if (scrolled_window->vscrollbar_visible)
1214     {
1215       GtkRequisition vscrollbar_requisition;
1216       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1217         gtk_widget_show (scrolled_window->vscrollbar);
1218
1219       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1220                                         &vscrollbar_requisition);
1221
1222       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1223            (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
1224             scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1225           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1226            (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1227             scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)))
1228         child_allocation.x = (relative_allocation.x +
1229                               relative_allocation.width +
1230                               scrollbar_spacing +
1231                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1232                                0 : widget->style->xthickness));
1233       else
1234         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1235
1236       child_allocation.y = relative_allocation.y;
1237       child_allocation.width = vscrollbar_requisition.width;
1238       child_allocation.height = relative_allocation.height;
1239       child_allocation.x += allocation->x;
1240       child_allocation.y += allocation->y;
1241
1242       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1243         {
1244           child_allocation.y -= widget->style->ythickness;
1245           child_allocation.height += 2 * widget->style->ythickness;
1246         }
1247
1248       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1249     }
1250   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1251     gtk_widget_hide (scrolled_window->vscrollbar);
1252 }
1253
1254 static gint
1255 gtk_scrolled_window_scroll_event (GtkWidget *widget,
1256                                   GdkEventScroll *event)
1257 {
1258   GtkWidget *range;
1259
1260   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1261   g_return_val_if_fail (event != NULL, FALSE);
1262
1263   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1264     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1265   else
1266     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1267
1268   if (range && GTK_WIDGET_VISIBLE (range))
1269     {
1270       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1271       gdouble delta, new_value;
1272
1273       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1274
1275       new_value = CLAMP (adj->value + delta, adj->lower, adj->upper - adj->page_size);
1276
1277       gtk_adjustment_set_value (adj, new_value);
1278
1279       return TRUE;
1280     }
1281
1282   return FALSE;
1283 }
1284
1285 static gint
1286 gtk_scrolled_window_focus (GtkWidget        *widget,
1287                            GtkDirectionType  direction)
1288 {
1289   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1290   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1291
1292   if (scrolled_window->focus_out)
1293     {
1294       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1295       return FALSE;
1296     }
1297
1298   if (gtk_widget_is_focus (widget))
1299     return FALSE;
1300
1301   /* We only put the scrolled window itself in the focus chain if it
1302    * isn't possible to focus any children.
1303    */
1304   if (GTK_BIN (widget)->child)
1305     {
1306       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1307         return TRUE;
1308     }
1309
1310   if (!had_focus_child)
1311     {
1312       gtk_widget_grab_focus (widget);
1313       return TRUE;
1314     }
1315   else
1316     return FALSE;
1317 }
1318
1319 static void
1320 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1321                                         gpointer       data)
1322 {
1323   GtkScrolledWindow *scrolled_win;
1324
1325   g_return_if_fail (adjustment != NULL);
1326   g_return_if_fail (data != NULL);
1327
1328   scrolled_win = GTK_SCROLLED_WINDOW (data);
1329
1330   if (scrolled_win->hscrollbar &&
1331       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1332     {
1333       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1334         {
1335           gboolean visible;
1336
1337           visible = scrolled_win->hscrollbar_visible;
1338           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1339                                               adjustment->page_size);
1340           if (scrolled_win->hscrollbar_visible != visible)
1341             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1342         }
1343     }
1344   else if (scrolled_win->vscrollbar &&
1345            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1346     {
1347       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1348         {
1349           gboolean visible;
1350
1351           visible = scrolled_win->vscrollbar_visible;
1352           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1353                                               adjustment->page_size);
1354           if (scrolled_win->vscrollbar_visible != visible)
1355             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1356         }
1357     }
1358 }
1359
1360 static void
1361 gtk_scrolled_window_add (GtkContainer *container,
1362                          GtkWidget    *child)
1363 {
1364   GtkScrolledWindow *scrolled_window;
1365   GtkBin *bin;
1366
1367   bin = GTK_BIN (container);
1368   g_return_if_fail (bin->child == NULL);
1369
1370   scrolled_window = GTK_SCROLLED_WINDOW (container);
1371
1372   bin->child = child;
1373   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1374
1375   /* this is a temporary message */
1376   if (!gtk_widget_set_scroll_adjustments (child,
1377                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1378                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1379     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1380                "use gtk_scrolled_window_add_with_viewport() instead");
1381 }
1382
1383 static void
1384 gtk_scrolled_window_remove (GtkContainer *container,
1385                             GtkWidget    *child)
1386 {
1387   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1388   g_return_if_fail (child != NULL);
1389   g_return_if_fail (GTK_BIN (container)->child == child);
1390
1391   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1392
1393   /* chain parent class handler to remove child */
1394   GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
1395 }
1396
1397 void
1398 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1399                                        GtkWidget         *child)
1400 {
1401   GtkBin *bin;
1402   GtkWidget *viewport;
1403
1404   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1405   g_return_if_fail (GTK_IS_WIDGET (child));
1406   g_return_if_fail (child->parent == NULL);
1407
1408   bin = GTK_BIN (scrolled_window);
1409
1410   if (bin->child != NULL)
1411     {
1412       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1413       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1414
1415       viewport = bin->child;
1416     }
1417   else
1418     {
1419       viewport =
1420         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1421                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1422       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1423     }
1424
1425   gtk_widget_show (viewport);
1426   gtk_container_add (GTK_CONTAINER (viewport), child);
1427 }
1428
1429 /**
1430  * _gtk_scrolled_window_get_spacing:
1431  * @scrolled_window: a scrolled window
1432  *
1433  * Gets the spacing between the scrolled window's scrollbars and
1434  * the scrolled widget. Used by GtkCombo
1435  *
1436  * Return value: the spacing, in pixels.
1437  **/
1438 gint
1439 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1440 {
1441   GtkScrolledWindowClass *class;
1442
1443   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1444
1445   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1446
1447   if (class->scrollbar_spacing >= 0)
1448     return class->scrollbar_spacing;
1449   else
1450     {
1451       gint scrollbar_spacing;
1452
1453       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1454                             "scrollbar-spacing", &scrollbar_spacing,
1455                             NULL);
1456
1457       return scrollbar_spacing;
1458     }
1459 }
1460
1461 #define __GTK_SCROLLED_WINDOW_C__
1462 #include "gtkaliasdef.c"