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 "gtkwindow.h"
  34 #include "gtkprivate.h"
  35 #include "gtkintl.h"
  36 #include "gtkalias.h"
  37
  38
  39 /* scrolled window policy and size requisition handling:
  40  *
  41  * gtk size requisition works as follows:
  42  *   a widget upon size-request reports the width and height that it finds
  43  *   to be best suited to display its contents, including children.
  44  *   the width and/or height reported from a widget upon size requisition
  45  *   may be overidden by the user by specifying a width and/or height
  46  *   other than 0 through gtk_widget_set_size_request().
  47  *
  48  * a scrolled window needs (for implementing all three policy types) to
  49  * request its width and height based on two different rationales.
  50  * 1)   the user wants the scrolled window to just fit into the space
  51  *      that it gets allocated for a specifc dimension.
  52  * 1.1) this does not apply if the user specified a concrete value
  53  *      value for that specific dimension by either specifying usize for the
  54  *      scrolled window or for its child.
  55  * 2)   the user wants the scrolled window to take as much space up as
  56  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
  57  *
  58  * also, kinda obvious:
  59  * 3)   a user would certainly not have choosen a scrolled window as a container
  60  *      for the child, if the resulting allocation takes up more space than the
  61  *      child would have allocated without the scrolled window.
  62  *
  63  * conclusions:
  64  * A) from 1) follows: the scrolled window shouldn't request more space for a
  65  *    specifc dimension than is required at minimum.
  66  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
  67  *    window (done automatically) or by usize of the child (needs to be checked).
  68  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
  69  *    child's dimension.
  70  * D) from 3) follows: the scrolled window child's minimum width and minimum height
  71  *    under A) at least correspond to the space taken up by its scrollbars.
  72  */
  73
  74 #define DEFAULT_SCROLLBAR_SPACING  3
  75
  76 typedef struct {
  77         gboolean window_placement_set;
  78         GtkCornerType real_window_placement;
  79 } GtkScrolledWindowPrivate;
  80
  81 #define GTK_SCROLLED_WINDOW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_SCROLLED_WINDOW, GtkScrolledWindowPrivate))
  82
  83 enum {
  84   PROP_0,
  85   PROP_HADJUSTMENT,
  86   PROP_VADJUSTMENT,
  87   PROP_HSCROLLBAR_POLICY,
  88   PROP_VSCROLLBAR_POLICY,
  89   PROP_WINDOW_PLACEMENT,
  90   PROP_WINDOW_PLACEMENT_SET,
  91   PROP_SHADOW_TYPE,
  92   PROP_LAST
  93 };
  94
  95 /* Signals */
  96 enum
  97 {
  98   SCROLL_CHILD,
  99   MOVE_FOCUS_OUT,
 100   LAST_SIGNAL
 101 };
 102
 103 static void gtk_scrolled_window_destroy            (GtkObject              *object);
 104 static void gtk_scrolled_window_finalize           (GObject                *object);
 105 static void gtk_scrolled_window_set_property       (GObject                *object,
 106                                                     guint                   prop_id,
 107                                                     const GValue           *value,
 108                                                     GParamSpec             *pspec);
 109 static void gtk_scrolled_window_get_property       (GObject                *object,
 110                                                     guint                   prop_id,
 111                                                     GValue                 *value,
 112                                                     GParamSpec             *pspec);
 113
 114 static void gtk_scrolled_window_screen_changed     (GtkWidget              *widget,
 115                                                     GdkScreen              *previous_screen);
 116 static gint gtk_scrolled_window_expose             (GtkWidget              *widget,
 117                                                     GdkEventExpose         *event);
 118 static void gtk_scrolled_window_size_request       (GtkWidget              *widget,
 119                                                     GtkRequisition         *requisition);
 120 static void gtk_scrolled_window_size_allocate      (GtkWidget              *widget,
 121                                                     GtkAllocation          *allocation);
 122 static gint gtk_scrolled_window_scroll_event       (GtkWidget              *widget,
 123                                                     GdkEventScroll         *event);
 124 static gint gtk_scrolled_window_focus              (GtkWidget              *widget,
 125                                                     GtkDirectionType        direction);
 126 static void gtk_scrolled_window_add                (GtkContainer           *container,
 127                                                     GtkWidget              *widget);
 128 static void gtk_scrolled_window_remove             (GtkContainer           *container,
 129                                                     GtkWidget              *widget);
 130 static void gtk_scrolled_window_forall             (GtkContainer           *container,
 131                                                     gboolean                include_internals,
 132                                                     GtkCallback             callback,
 133                                                     gpointer                callback_data);
 134 static gboolean gtk_scrolled_window_scroll_child   (GtkScrolledWindow      *scrolled_window,
 135                                                     GtkScrollType           scroll,
 136                                                     gboolean                horizontal);
 137 static void gtk_scrolled_window_move_focus_out     (GtkScrolledWindow      *scrolled_window,
 138                                                     GtkDirectionType        direction_type);
 139
 140 static void gtk_scrolled_window_relative_allocation(GtkWidget              *widget,
 141                                                     GtkAllocation          *allocation);
 142 static void gtk_scrolled_window_adjustment_changed (GtkAdjustment          *adjustment,
 143                                                     gpointer                data);
 144
 145 static void gtk_scrolled_window_update_real_placement (GtkScrolledWindow   *scrolled_window);
 146
 147 static guint signals[LAST_SIGNAL] = {0};
 148
 149 G_DEFINE_TYPE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN)
 150
 151 static void
 152 add_scroll_binding (GtkBindingSet  *binding_set,
 153                     guint           keyval,
 154                     GdkModifierType mask,
 155                     GtkScrollType   scroll,
 156                     gboolean        horizontal)
 157 {
 158   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 159
 160   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 161                                 "scroll_child", 2,
 162                                 GTK_TYPE_SCROLL_TYPE, scroll,
 163                                 G_TYPE_BOOLEAN, horizontal);
 164   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 165                                 "scroll_child", 2,
 166                                 GTK_TYPE_SCROLL_TYPE, scroll,
 167                                 G_TYPE_BOOLEAN, horizontal);
 168 }
 169
 170 static void
 171 add_tab_bindings (GtkBindingSet    *binding_set,
 172                   GdkModifierType   modifiers,
 173                   GtkDirectionType  direction)
 174 {
 175   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 176                                 "move_focus_out", 1,
 177                                 GTK_TYPE_DIRECTION_TYPE, direction);
 178   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 179                                 "move_focus_out", 1,
 180                                 GTK_TYPE_DIRECTION_TYPE, direction);
 181 }
 182
 183 static void
 184 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 185 {
 186   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 187   GtkObjectClass *object_class;
 188   GtkWidgetClass *widget_class;
 189   GtkContainerClass *container_class;
 190   GtkBindingSet *binding_set;
 191
 192   object_class = (GtkObjectClass*) class;
 193   widget_class = (GtkWidgetClass*) class;
 194   container_class = (GtkContainerClass*) class;
 195
 196   gobject_class->finalize = gtk_scrolled_window_finalize;
 197   gobject_class->set_property = gtk_scrolled_window_set_property;
 198   gobject_class->get_property = gtk_scrolled_window_get_property;
 199
 200   object_class->destroy = gtk_scrolled_window_destroy;
 201
 202   widget_class->screen_changed = gtk_scrolled_window_screen_changed;
 203   widget_class->expose_event = gtk_scrolled_window_expose;
 204   widget_class->size_request = gtk_scrolled_window_size_request;
 205   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 206   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 207   widget_class->focus = gtk_scrolled_window_focus;
 208
 209   container_class->add = gtk_scrolled_window_add;
 210   container_class->remove = gtk_scrolled_window_remove;
 211   container_class->forall = gtk_scrolled_window_forall;
 212
 213   class->scrollbar_spacing = -1;
 214
 215   class->scroll_child = gtk_scrolled_window_scroll_child;
 216   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 217
 218   g_object_class_install_property (gobject_class,
 219                                    PROP_HADJUSTMENT,
 220                                    g_param_spec_object ("hadjustment",
 221                                                         P_("Horizontal Adjustment"),
 222                                                         P_("The GtkAdjustment for the horizontal position"),
 223                                                         GTK_TYPE_ADJUSTMENT,
 224                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 225   g_object_class_install_property (gobject_class,
 226                                    PROP_VADJUSTMENT,
 227                                    g_param_spec_object ("vadjustment",
 228                                                         P_("Vertical Adjustment"),
 229                                                         P_("The GtkAdjustment for the vertical position"),
 230                                                         GTK_TYPE_ADJUSTMENT,
 231                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 232   g_object_class_install_property (gobject_class,
 233                                    PROP_HSCROLLBAR_POLICY,
 234                                    g_param_spec_enum ("hscrollbar-policy",
 235                                                       P_("Horizontal Scrollbar Policy"),
 236                                                       P_("When the horizontal scrollbar is displayed"),
 237                                                       GTK_TYPE_POLICY_TYPE,
 238                                                       GTK_POLICY_ALWAYS,
 239                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 240   g_object_class_install_property (gobject_class,
 241                                    PROP_VSCROLLBAR_POLICY,
 242                                    g_param_spec_enum ("vscrollbar-policy",
 243                                                       P_("Vertical Scrollbar Policy"),
 244                                                       P_("When the vertical scrollbar is displayed"),
 245                                                       GTK_TYPE_POLICY_TYPE,
 246                                                       GTK_POLICY_ALWAYS,
 247                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 248
 249   g_object_class_install_property (gobject_class,
 250                                    PROP_WINDOW_PLACEMENT,
 251                                    g_param_spec_enum ("window-placement",
 252                                                       P_("Window Placement"),
 253                                                       P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
 254                                                       GTK_TYPE_CORNER_TYPE,
 255                                                       GTK_CORNER_TOP_LEFT,
 256                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 257
 258   /**
 259    * GtkScrolledWindow:window-placement-set:
 260    *
 261    * Whether "window-placement" should be used to determine the location
 262    * of the contents with respect to the scrollbars. Otherwise, the
 263    * "gtk-scrolled-window-placement" setting is used.
 264    *
 265    * Since: 2.10
 266    */
 267   g_object_class_install_property (gobject_class,
 268                                    PROP_WINDOW_PLACEMENT_SET,
 269                                    g_param_spec_boolean ("window-placement-set",
 270                                                          P_("Window Placement Set"),
 271                                                          P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
 272                                                          FALSE,
 273                                                          GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 274   g_object_class_install_property (gobject_class,
 275                                    PROP_SHADOW_TYPE,
 276                                    g_param_spec_enum ("shadow-type",
 277                                                       P_("Shadow Type"),
 278                                                       P_("Style of bevel around the contents"),
 279                                                       GTK_TYPE_SHADOW_TYPE,
 280                                                       GTK_SHADOW_NONE,
 281                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 282
 283   /**
 284    * GtkScrolledWindow:scrollbars-within-bevel:
 285    *
 286    * Whether to place scrollbars within the scrolled window's bevel.
 287    *
 288    * Since: 2.12
 289    */
 290   gtk_widget_class_install_style_property (widget_class,
 291                                            g_param_spec_boolean ("scrollbars-within-bevel",
 292                                                                  P_("Scrollbars within bevel"),
 293                                                                  P_("Place scrollbars within the scrolled window's bevel"),
 294                                                                  FALSE,
 295                                                                  GTK_PARAM_READABLE));
 296
 297   gtk_widget_class_install_style_property (widget_class,
 298                                            g_param_spec_int ("scrollbar-spacing",
 299                                                              P_("Scrollbar spacing"),
 300                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 301                                                              0,
 302                                                              G_MAXINT,
 303                                                              DEFAULT_SCROLLBAR_SPACING,
 304                                                              GTK_PARAM_READABLE));
 305
 306   /**
 307    * GtkSettings:gtk-scrolled-window-placement:
 308    *
 309    * Where the contents of scrolled windows are located with respect to the
 310    * scrollbars, if not overridden by the scrolled window's own placement.
 311    *
 312    * Since: 2.10
 313    */
 314   gtk_settings_install_property (g_param_spec_enum ("gtk-scrolled-window-placement",
 315                                                     P_("Scrolled Window Placement"),
 316                                                     P_("Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement."),
 317                                                     GTK_TYPE_CORNER_TYPE,
 318                                                     GTK_CORNER_TOP_LEFT,
 319                                                     G_PARAM_READABLE | G_PARAM_WRITABLE));
 320
 321
 322   signals[SCROLL_CHILD] =
 323     g_signal_new (I_("scroll_child"),
 324                   G_TYPE_FROM_CLASS (object_class),
 325                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 326                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 327                   NULL, NULL,
 328                   _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
 329                   G_TYPE_BOOLEAN, 2,
 330                   GTK_TYPE_SCROLL_TYPE,
 331                   G_TYPE_BOOLEAN);
 332   signals[MOVE_FOCUS_OUT] =
 333     g_signal_new (I_("move_focus_out"),
 334                   G_TYPE_FROM_CLASS (object_class),
 335                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 336                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 337                   NULL, NULL,
 338                   _gtk_marshal_VOID__ENUM,
 339                   G_TYPE_NONE, 1,
 340                   GTK_TYPE_DIRECTION_TYPE);
 341
 342   binding_set = gtk_binding_set_by_class (class);
 343
 344   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 345   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 346   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 347   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 348
 349   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 350   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 351   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 352   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 353
 354   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 355   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 356   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 357   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 358
 359   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 360   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 361
 362   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 363 }
 364
 365 static void
 366 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 367 {
 368   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 369
 370   scrolled_window->hscrollbar = NULL;
 371   scrolled_window->vscrollbar = NULL;
 372   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 373   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 374   scrolled_window->hscrollbar_visible = FALSE;
 375   scrolled_window->vscrollbar_visible = FALSE;
 376   scrolled_window->focus_out = FALSE;
 377   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 378   gtk_scrolled_window_update_real_placement (scrolled_window);
 379 }
 380
 381 GtkWidget*
 382 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 383                          GtkAdjustment *vadjustment)
 384 {
 385   GtkWidget *scrolled_window;
 386
 387   if (hadjustment)
 388     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 389
 390   if (vadjustment)
 391     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 392
 393   scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
 394                                     "hadjustment", hadjustment,
 395                                     "vadjustment", vadjustment,
 396                                     NULL);
 397
 398   return scrolled_window;
 399 }
 400
 401 void
 402 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 403                                      GtkAdjustment     *hadjustment)
 404 {
 405   GtkBin *bin;
 406
 407   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 408   if (hadjustment)
 409     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 410   else
 411     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 412
 413   bin = GTK_BIN (scrolled_window);
 414
 415   if (!scrolled_window->hscrollbar)
 416     {
 417       gtk_widget_push_composite_child ();
 418       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 419       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 420       gtk_widget_pop_composite_child ();
 421
 422       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 423       g_object_ref (scrolled_window->hscrollbar);
 424       gtk_widget_show (scrolled_window->hscrollbar);
 425     }
 426   else
 427     {
 428       GtkAdjustment *old_adjustment;
 429
 430       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 431       if (old_adjustment == hadjustment)
 432         return;
 433
 434       g_signal_handlers_disconnect_by_func (old_adjustment,
 435                                             gtk_scrolled_window_adjustment_changed,
 436                                             scrolled_window);
 437       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 438                                 hadjustment);
 439     }
 440   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 441   g_signal_connect (hadjustment,
 442                     "changed",
 443                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 444                     scrolled_window);
 445   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 446
 447   if (bin->child)
 448     gtk_widget_set_scroll_adjustments (bin->child,
 449                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 450                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 451
 452   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 453 }
 454
 455 void
 456 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 457                                      GtkAdjustment     *vadjustment)
 458 {
 459   GtkBin *bin;
 460
 461   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 462   if (vadjustment)
 463     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 464   else
 465     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 466
 467   bin = GTK_BIN (scrolled_window);
 468
 469   if (!scrolled_window->vscrollbar)
 470     {
 471       gtk_widget_push_composite_child ();
 472       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 473       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 474       gtk_widget_pop_composite_child ();
 475
 476       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 477       g_object_ref (scrolled_window->vscrollbar);
 478       gtk_widget_show (scrolled_window->vscrollbar);
 479     }
 480   else
 481     {
 482       GtkAdjustment *old_adjustment;
 483
 484       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 485       if (old_adjustment == vadjustment)
 486         return;
 487
 488       g_signal_handlers_disconnect_by_func (old_adjustment,
 489                                             gtk_scrolled_window_adjustment_changed,
 490                                             scrolled_window);
 491       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 492                                 vadjustment);
 493     }
 494   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 495   g_signal_connect (vadjustment,
 496                     "changed",
 497                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 498                     scrolled_window);
 499   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 500
 501   if (bin->child)
 502     gtk_widget_set_scroll_adjustments (bin->child,
 503                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 504                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 505
 506   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 507 }
 508
 509 GtkAdjustment*
 510 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 511 {
 512   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 513
 514   return (scrolled_window->hscrollbar ?
 515           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 516           NULL);
 517 }
 518
 519 GtkAdjustment*
 520 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 521 {
 522   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 523
 524   return (scrolled_window->vscrollbar ?
 525           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 526           NULL);
 527 }
 528
 529 /**
 530  * gtk_scrolled_window_get_hscrollbar:
 531  * @scrolled_window: a #GtkScrolledWindow
 532  *
 533  * Returns the horizontal scrollbar of @scrolled_window.
 534  *
 535  * Returns: the horizontal scrollbar of the scrolled window, or
 536  *  %NULL if it does not have one.
 537  *
 538  * Since: 2.8
 539  */
 540 GtkWidget*
 541 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 542 {
 543   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 544
 545   return scrolled_window->hscrollbar;
 546 }
 547
 548 /**
 549  * gtk_scrolled_window_get_vscrollbar:
 550  * @scrolled_window: a #GtkScrolledWindow
 551  *
 552  * Returns the vertical scrollbar of @scrolled_window.
 553  *
 554  * Returns: the vertical scrollbar of the scrolled window, or
 555  *  %NULL if it does not have one.
 556  *
 557  * Since: 2.8
 558  */
 559 GtkWidget*
 560 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 561 {
 562   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 563
 564   return scrolled_window->vscrollbar;
 565 }
 566
 567 void
 568 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 569                                 GtkPolicyType      hscrollbar_policy,
 570                                 GtkPolicyType      vscrollbar_policy)
 571 {
 572   GObject *object = G_OBJECT (scrolled_window);
 573
 574   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 575
 576   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 577       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 578     {
 579       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 580       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 581
 582       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 583
 584       g_object_freeze_notify (object);
 585       g_object_notify (object, "hscrollbar-policy");
 586       g_object_notify (object, "vscrollbar-policy");
 587       g_object_thaw_notify (object);
 588     }
 589 }
 590
 591 /**
 592  * gtk_scrolled_window_get_policy:
 593  * @scrolled_window: a #GtkScrolledWindow
 594  * @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 595  * @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 596  *
 597  * Retrieves the current policy values for the horizontal and vertical
 598  * scrollbars. See gtk_scrolled_window_set_policy().
 599  **/
 600 void
 601 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 602                                 GtkPolicyType     *hscrollbar_policy,
 603                                 GtkPolicyType     *vscrollbar_policy)
 604 {
 605   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 606
 607   if (hscrollbar_policy)
 608     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 609   if (vscrollbar_policy)
 610     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 611 }
 612
 613 static void
 614 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 615 {
 616   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 617   GtkSettings *settings;
 618
 619   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 620
 621   if (priv->window_placement_set || settings == NULL)
 622     priv->real_window_placement = scrolled_window->window_placement;
 623   else
 624     g_object_get (settings,
 625                   "gtk-scrolled-window-placement",
 626                   &priv->real_window_placement,
 627                   NULL);
 628 }
 629
 630 static void
 631 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 632                                             GtkCornerType      window_placement)
 633 {
 634   if (scrolled_window->window_placement != window_placement)
 635     {
 636       scrolled_window->window_placement = window_placement;
 637
 638       gtk_scrolled_window_update_real_placement (scrolled_window);
 639       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 640
 641       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 642     }
 643 }
 644
 645 static void
 646 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 647                                        gboolean           placement_set,
 648                                        gboolean           emit_resize)
 649 {
 650   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 651
 652   if (priv->window_placement_set != placement_set)
 653     {
 654       priv->window_placement_set = placement_set;
 655
 656       gtk_scrolled_window_update_real_placement (scrolled_window);
 657       if (emit_resize)
 658         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 659
 660       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 661     }
 662 }
 663
 664 /**
 665  * gtk_scrolled_window_set_placement:
 666  * @scrolled_window: a #GtkScrolledWindow
 667  * @window_placement: position of the child window
 668  *
 669  * Sets the placement of the contents with respect to the scrollbars
 670  * for the scrolled window.
 671  * The default is %GTK_CORNER_TOP_LEFT, meaning the child is
 672  * in the top left, with the scrollbars underneath and to the right.
 673  * Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
 674  * %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
 675  *
 676  * See also gtk_scrolled_window_get_placement() and
 677  * gtk_scrolled_window_unset_placement().
 678  **/
 679 void
 680 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 681                                    GtkCornerType      window_placement)
 682 {
 683   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 684
 685   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 686   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 687 }
 688
 689 /**
 690  * gtk_scrolled_window_get_placement:
 691  * @scrolled_window: a #GtkScrolledWindow
 692  *
 693  * Gets the placement of the contents with respect to the scrollbars
 694  * for the scrolled window. See gtk_scrolled_window_set_placement().
 695  *
 696  * Return value: the current placement value.
 697  *
 698  * See also gtk_scrolled_window_set_placement() and
 699  * gtk_scrolled_window_unset_placement().
 700  **/
 701 GtkCornerType
 702 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 703 {
 704   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 705
 706   return scrolled_window->window_placement;
 707 }
 708
 709 /**
 710  * gtk_scrolled_window_unset_placement:
 711  * @scrolled_window: a #GtkScrolledWindow
 712  *
 713  * Unsets the placement of the contents with respect to the scrollbars
 714  * for the scrolled window. If no window placement is set for a scrolled
 715  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 716  *
 717  * See also gtk_scrolled_window_set_placement() and
 718  * gtk_scrolled_window_get_placement().
 719  *
 720  * Since: 2.10
 721  **/
 722 void
 723 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 724 {
 725   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 726
 727   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 728
 729   if (priv->window_placement_set)
 730     {
 731       priv->window_placement_set = FALSE;
 732
 733       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 734
 735       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 736     }
 737 }
 738
 739 /**
 740  * gtk_scrolled_window_set_shadow_type:
 741  * @scrolled_window: a #GtkScrolledWindow
 742  * @type: kind of shadow to draw around scrolled window contents
 743  *
 744  * Changes the type of shadow drawn around the contents of
 745  * @scrolled_window.
 746  *
 747  **/
 748 void
 749 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 750                                      GtkShadowType      type)
 751 {
 752   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 753   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 754
 755   if (scrolled_window->shadow_type != type)
 756     {
 757       scrolled_window->shadow_type = type;
 758
 759       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 760         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 761
 762       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 763
 764       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 765     }
 766 }
 767
 768 /**
 769  * gtk_scrolled_window_get_shadow_type:
 770  * @scrolled_window: a #GtkScrolledWindow
 771  *
 772  * Gets the shadow type of the scrolled window. See
 773  * gtk_scrolled_window_set_shadow_type().
 774  *
 775  * Return value: the current shadow type
 776  **/
 777 GtkShadowType
 778 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 779 {
 780   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 781
 782   return scrolled_window->shadow_type;
 783 }
 784
 785 static void
 786 gtk_scrolled_window_destroy (GtkObject *object)
 787 {
 788   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 789
 790   gtk_widget_unparent (scrolled_window->hscrollbar);
 791   gtk_widget_unparent (scrolled_window->vscrollbar);
 792   gtk_widget_destroy (scrolled_window->hscrollbar);
 793   gtk_widget_destroy (scrolled_window->vscrollbar);
 794
 795   GTK_OBJECT_CLASS (gtk_scrolled_window_parent_class)->destroy (object);
 796 }
 797
 798 static void
 799 gtk_scrolled_window_finalize (GObject *object)
 800 {
 801   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 802
 803   g_object_unref (scrolled_window->hscrollbar);
 804   g_object_unref (scrolled_window->vscrollbar);
 805
 806   G_OBJECT_CLASS (gtk_scrolled_window_parent_class)->finalize (object);
 807 }
 808
 809 static void
 810 gtk_scrolled_window_set_property (GObject      *object,
 811                                   guint         prop_id,
 812                                   const GValue *value,
 813                                   GParamSpec   *pspec)
 814 {
 815   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 816
 817   switch (prop_id)
 818     {
 819     case PROP_HADJUSTMENT:
 820       gtk_scrolled_window_set_hadjustment (scrolled_window,
 821                                            g_value_get_object (value));
 822       break;
 823     case PROP_VADJUSTMENT:
 824       gtk_scrolled_window_set_vadjustment (scrolled_window,
 825                                            g_value_get_object (value));
 826       break;
 827     case PROP_HSCROLLBAR_POLICY:
 828       gtk_scrolled_window_set_policy (scrolled_window,
 829                                       g_value_get_enum (value),
 830                                       scrolled_window->vscrollbar_policy);
 831       break;
 832     case PROP_VSCROLLBAR_POLICY:
 833       gtk_scrolled_window_set_policy (scrolled_window,
 834                                       scrolled_window->hscrollbar_policy,
 835                                       g_value_get_enum (value));
 836       break;
 837     case PROP_WINDOW_PLACEMENT:
 838       gtk_scrolled_window_set_placement_internal (scrolled_window,
 839                                                   g_value_get_enum (value));
 840       break;
 841     case PROP_WINDOW_PLACEMENT_SET:
 842       gtk_scrolled_window_set_placement_set (scrolled_window,
 843                                              g_value_get_boolean (value),
 844                                              TRUE);
 845       break;
 846     case PROP_SHADOW_TYPE:
 847       gtk_scrolled_window_set_shadow_type (scrolled_window,
 848                                            g_value_get_enum (value));
 849       break;
 850     default:
 851       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 852       break;
 853     }
 854 }
 855
 856 static void
 857 gtk_scrolled_window_get_property (GObject    *object,
 858                                   guint       prop_id,
 859                                   GValue     *value,
 860                                   GParamSpec *pspec)
 861 {
 862   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 863   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 864
 865   switch (prop_id)
 866     {
 867     case PROP_HADJUSTMENT:
 868       g_value_set_object (value,
 869                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 870       break;
 871     case PROP_VADJUSTMENT:
 872       g_value_set_object (value,
 873                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 874       break;
 875     case PROP_HSCROLLBAR_POLICY:
 876       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 877       break;
 878     case PROP_VSCROLLBAR_POLICY:
 879       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 880       break;
 881     case PROP_WINDOW_PLACEMENT:
 882       g_value_set_enum (value, scrolled_window->window_placement);
 883       break;
 884     case PROP_WINDOW_PLACEMENT_SET:
 885       g_value_set_boolean (value, priv->window_placement_set);
 886       break;
 887     case PROP_SHADOW_TYPE:
 888       g_value_set_enum (value, scrolled_window->shadow_type);
 889       break;
 890     default:
 891       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 892       break;
 893     }
 894 }
 895
 896 static void
 897 traverse_container (GtkWidget *widget,
 898                     gpointer   data)
 899 {
 900   if (GTK_IS_SCROLLED_WINDOW (widget))
 901     {
 902       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 903       gtk_widget_queue_resize (widget);
 904     }
 905   else if (GTK_IS_CONTAINER (widget))
 906     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
 907 }
 908
 909 static void
 910 gtk_scrolled_window_settings_changed (GtkSettings *settings)
 911 {
 912   GList *list, *l;
 913
 914   list = gtk_window_list_toplevels ();
 915
 916   for (l = list; l; l = l->next)
 917     gtk_container_forall (GTK_CONTAINER (l->data),
 918                           traverse_container, NULL);
 919
 920   g_list_free (list);
 921 }
 922
 923 static void
 924 gtk_scrolled_window_screen_changed (GtkWidget *widget,
 925                                     GdkScreen *previous_screen)
 926 {
 927   GtkSettings *settings;
 928   guint window_placement_connection;
 929
 930   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 931
 932   if (!gtk_widget_has_screen (widget))
 933     return;
 934
 935   settings = gtk_widget_get_settings (widget);
 936
 937   window_placement_connection =
 938     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
 939                                          "gtk-scrolled-window-connection"));
 940
 941   if (window_placement_connection)
 942     return;
 943
 944   window_placement_connection =
 945     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
 946                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
 947   g_object_set_data (G_OBJECT (settings),
 948                      I_("gtk-scrolled-window-connection"),
 949                      GUINT_TO_POINTER (window_placement_connection));
 950 }
 951
 952 static void
 953 gtk_scrolled_window_paint (GtkWidget    *widget,
 954                            GdkRectangle *area)
 955 {
 956   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 957
 958   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 959     {
 960       GtkAllocation relative_allocation;
 961       gboolean scrollbars_within_bevel;
 962
 963       gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
 964
 965       if (!scrollbars_within_bevel)
 966         {
 967           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
 968
 969           relative_allocation.x -= widget->style->xthickness;
 970           relative_allocation.y -= widget->style->ythickness;
 971           relative_allocation.width += 2 * widget->style->xthickness;
 972           relative_allocation.height += 2 * widget->style->ythickness;
 973         }
 974       else
 975         {
 976           GtkContainer *container = GTK_CONTAINER (widget);
 977
 978           relative_allocation.x = container->border_width;
 979           relative_allocation.y = container->border_width;
 980           relative_allocation.width = widget->allocation.width - 2 * container->border_width;
 981           relative_allocation.height = widget->allocation.height - 2 * container->border_width;
 982         }
 983
 984       gtk_paint_shadow (widget->style, widget->window,
 985                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
 986                         area, widget, "scrolled_window",
 987                         widget->allocation.x + relative_allocation.x,
 988                         widget->allocation.y + relative_allocation.y,
 989                         relative_allocation.width,
 990                         relative_allocation.height);
 991     }
 992 }
 993
 994 static gint
 995 gtk_scrolled_window_expose (GtkWidget      *widget,
 996                             GdkEventExpose *event)
 997 {
 998   if (GTK_WIDGET_DRAWABLE (widget))
 999     {
1000       gtk_scrolled_window_paint (widget, &event->area);
1001
1002       (* GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->expose_event) (widget, event);
1003     }
1004
1005   return FALSE;
1006 }
1007
1008 static void
1009 gtk_scrolled_window_forall (GtkContainer *container,
1010                             gboolean      include_internals,
1011                             GtkCallback   callback,
1012                             gpointer      callback_data)
1013 {
1014   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1015   g_return_if_fail (callback != NULL);
1016
1017   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
1018                                               include_internals,
1019                                               callback,
1020                                               callback_data);
1021   if (include_internals)
1022     {
1023       GtkScrolledWindow *scrolled_window;
1024
1025       scrolled_window = GTK_SCROLLED_WINDOW (container);
1026
1027       if (scrolled_window->vscrollbar)
1028         callback (scrolled_window->vscrollbar, callback_data);
1029       if (scrolled_window->hscrollbar)
1030         callback (scrolled_window->hscrollbar, callback_data);
1031     }
1032 }
1033
1034 static gboolean
1035 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1036                                   GtkScrollType      scroll,
1037                                   gboolean           horizontal)
1038 {
1039   GtkAdjustment *adjustment = NULL;
1040
1041   switch (scroll)
1042     {
1043     case GTK_SCROLL_STEP_UP:
1044       scroll = GTK_SCROLL_STEP_BACKWARD;
1045       horizontal = FALSE;
1046       break;
1047     case GTK_SCROLL_STEP_DOWN:
1048       scroll = GTK_SCROLL_STEP_FORWARD;
1049       horizontal = FALSE;
1050       break;
1051     case GTK_SCROLL_STEP_LEFT:
1052       scroll = GTK_SCROLL_STEP_BACKWARD;
1053       horizontal = TRUE;
1054       break;
1055     case GTK_SCROLL_STEP_RIGHT:
1056       scroll = GTK_SCROLL_STEP_FORWARD;
1057       horizontal = TRUE;
1058       break;
1059     case GTK_SCROLL_PAGE_UP:
1060       scroll = GTK_SCROLL_PAGE_BACKWARD;
1061       horizontal = FALSE;
1062       break;
1063     case GTK_SCROLL_PAGE_DOWN:
1064       scroll = GTK_SCROLL_PAGE_FORWARD;
1065       horizontal = FALSE;
1066       break;
1067     case GTK_SCROLL_PAGE_LEFT:
1068       scroll = GTK_SCROLL_STEP_BACKWARD;
1069       horizontal = TRUE;
1070       break;
1071     case GTK_SCROLL_PAGE_RIGHT:
1072       scroll = GTK_SCROLL_STEP_FORWARD;
1073       horizontal = TRUE;
1074       break;
1075     case GTK_SCROLL_STEP_BACKWARD:
1076     case GTK_SCROLL_STEP_FORWARD:
1077     case GTK_SCROLL_PAGE_BACKWARD:
1078     case GTK_SCROLL_PAGE_FORWARD:
1079     case GTK_SCROLL_START:
1080     case GTK_SCROLL_END:
1081       break;
1082     default:
1083       g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
1084       return FALSE;
1085     }
1086
1087   if ((horizontal && (!scrolled_window->hscrollbar || !scrolled_window->hscrollbar_visible)) ||
1088       (!horizontal && (!scrolled_window->vscrollbar || !scrolled_window->vscrollbar_visible)))
1089     return FALSE;
1090
1091   if (horizontal)
1092     {
1093       if (scrolled_window->hscrollbar)
1094         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
1095     }
1096   else
1097     {
1098       if (scrolled_window->vscrollbar)
1099         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
1100     }
1101
1102   if (adjustment)
1103     {
1104       gdouble value = adjustment->value;
1105
1106       switch (scroll)
1107         {
1108         case GTK_SCROLL_STEP_FORWARD:
1109           value += adjustment->step_increment;
1110           break;
1111         case GTK_SCROLL_STEP_BACKWARD:
1112           value -= adjustment->step_increment;
1113           break;
1114         case GTK_SCROLL_PAGE_FORWARD:
1115           value += adjustment->page_increment;
1116           break;
1117         case GTK_SCROLL_PAGE_BACKWARD:
1118           value -= adjustment->page_increment;
1119           break;
1120         case GTK_SCROLL_START:
1121           value = adjustment->lower;
1122           break;
1123         case GTK_SCROLL_END:
1124           value = adjustment->upper;
1125           break;
1126         default:
1127           g_assert_not_reached ();
1128           break;
1129         }
1130
1131       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
1132
1133       gtk_adjustment_set_value (adjustment, value);
1134
1135       return TRUE;
1136     }
1137
1138   return FALSE;
1139 }
1140
1141 static void
1142 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1143                                     GtkDirectionType   direction_type)
1144 {
1145   GtkWidget *toplevel;
1146
1147   /* Focus out of the scrolled window entirely. We do this by setting
1148    * a flag, then propagating the focus motion to the notebook.
1149    */
1150   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1151   if (!GTK_WIDGET_TOPLEVEL (toplevel))
1152     return;
1153
1154   g_object_ref (scrolled_window);
1155
1156   scrolled_window->focus_out = TRUE;
1157   g_signal_emit_by_name (toplevel, "move_focus", direction_type);
1158   scrolled_window->focus_out = FALSE;
1159
1160   g_object_unref (scrolled_window);
1161 }
1162
1163 static void
1164 gtk_scrolled_window_size_request (GtkWidget      *widget,
1165                                   GtkRequisition *requisition)
1166 {
1167   GtkScrolledWindow *scrolled_window;
1168   GtkBin *bin;
1169   gint extra_width;
1170   gint extra_height;
1171   gint scrollbar_spacing;
1172   GtkRequisition hscrollbar_requisition;
1173   GtkRequisition vscrollbar_requisition;
1174   GtkRequisition child_requisition;
1175
1176   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1177   g_return_if_fail (requisition != NULL);
1178
1179   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1180   bin = GTK_BIN (scrolled_window);
1181
1182   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1183
1184   extra_width = 0;
1185   extra_height = 0;
1186   requisition->width = 0;
1187   requisition->height = 0;
1188
1189   gtk_widget_size_request (scrolled_window->hscrollbar,
1190                            &hscrollbar_requisition);
1191   gtk_widget_size_request (scrolled_window->vscrollbar,
1192                            &vscrollbar_requisition);
1193
1194   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1195     {
1196       gtk_widget_size_request (bin->child, &child_requisition);
1197
1198       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1199         requisition->width += child_requisition.width;
1200       else
1201         {
1202           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1203
1204           if (aux_info && aux_info->width > 0)
1205             {
1206               requisition->width += aux_info->width;
1207               extra_width = -1;
1208             }
1209           else
1210             requisition->width += vscrollbar_requisition.width;
1211         }
1212
1213       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1214         requisition->height += child_requisition.height;
1215       else
1216         {
1217           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1218
1219           if (aux_info && aux_info->height > 0)
1220             {
1221               requisition->height += aux_info->height;
1222               extra_height = -1;
1223             }
1224           else
1225             requisition->height += hscrollbar_requisition.height;
1226         }
1227     }
1228
1229   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1230       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1231     {
1232       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
1233       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1234         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1235     }
1236
1237   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1238       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1239     {
1240       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
1241       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1242         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1243     }
1244
1245   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
1246   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
1247
1248   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1249     {
1250       requisition->width += 2 * widget->style->xthickness;
1251       requisition->height += 2 * widget->style->ythickness;
1252     }
1253 }
1254
1255 static void
1256 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1257                                          GtkAllocation *allocation)
1258 {
1259   GtkScrolledWindow *scrolled_window;
1260   GtkScrolledWindowPrivate *priv;
1261   gint scrollbar_spacing;
1262
1263   g_return_if_fail (widget != NULL);
1264   g_return_if_fail (allocation != NULL);
1265
1266   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1267   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1268
1269   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1270
1271   allocation->x = GTK_CONTAINER (widget)->border_width;
1272   allocation->y = GTK_CONTAINER (widget)->border_width;
1273
1274   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1275     {
1276       allocation->x += widget->style->xthickness;
1277       allocation->y += widget->style->ythickness;
1278     }
1279
1280   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1281   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1282
1283   if (scrolled_window->vscrollbar_visible)
1284     {
1285       GtkRequisition vscrollbar_requisition;
1286       gboolean is_rtl;
1287
1288       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1289                                         &vscrollbar_requisition);
1290       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1291
1292       if ((!is_rtl &&
1293            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1294             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1295           (is_rtl &&
1296            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1297             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1298         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1299
1300       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1301     }
1302   if (scrolled_window->hscrollbar_visible)
1303     {
1304       GtkRequisition hscrollbar_requisition;
1305       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1306                                         &hscrollbar_requisition);
1307
1308       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1309           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1310         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1311
1312       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1313     }
1314 }
1315
1316 static void
1317 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1318                                    GtkAllocation *allocation)
1319 {
1320   GtkScrolledWindow *scrolled_window;
1321   GtkScrolledWindowPrivate *priv;
1322   GtkBin *bin;
1323   GtkAllocation relative_allocation;
1324   GtkAllocation child_allocation;
1325   gboolean scrollbars_within_bevel;
1326   gint scrollbar_spacing;
1327
1328   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1329   g_return_if_fail (allocation != NULL);
1330
1331   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1332   bin = GTK_BIN (scrolled_window);
1333
1334   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1335   gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1336
1337   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1338
1339   widget->allocation = *allocation;
1340
1341   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1342     scrolled_window->hscrollbar_visible = TRUE;
1343   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1344     scrolled_window->hscrollbar_visible = FALSE;
1345   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1346     scrolled_window->vscrollbar_visible = TRUE;
1347   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1348     scrolled_window->vscrollbar_visible = FALSE;
1349
1350   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1351     {
1352       gboolean previous_hvis;
1353       gboolean previous_vvis;
1354       guint count = 0;
1355
1356       do
1357         {
1358           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1359
1360           child_allocation.x = relative_allocation.x + allocation->x;
1361           child_allocation.y = relative_allocation.y + allocation->y;
1362           child_allocation.width = relative_allocation.width;
1363           child_allocation.height = relative_allocation.height;
1364
1365           previous_hvis = scrolled_window->hscrollbar_visible;
1366           previous_vvis = scrolled_window->vscrollbar_visible;
1367
1368           gtk_widget_size_allocate (bin->child, &child_allocation);
1369
1370           /* If, after the first iteration, the hscrollbar and the
1371            * vscrollbar flip visiblity, then we need both.
1372            */
1373           if (count &&
1374               previous_hvis != scrolled_window->hscrollbar_visible &&
1375               previous_vvis != scrolled_window->vscrollbar_visible)
1376             {
1377               scrolled_window->hscrollbar_visible = TRUE;
1378               scrolled_window->vscrollbar_visible = TRUE;
1379
1380               /* a new resize is already queued at this point,
1381                * so we will immediatedly get reinvoked
1382                */
1383               return;
1384             }
1385
1386           count++;
1387         }
1388       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1389              previous_vvis != scrolled_window->vscrollbar_visible);
1390     }
1391   else
1392     {
1393       scrolled_window->hscrollbar_visible = scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS;
1394       scrolled_window->vscrollbar_visible = scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS;
1395       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1396     }
1397
1398   if (scrolled_window->hscrollbar_visible)
1399     {
1400       GtkRequisition hscrollbar_requisition;
1401       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1402                                         &hscrollbar_requisition);
1403
1404       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1405         gtk_widget_show (scrolled_window->hscrollbar);
1406
1407       child_allocation.x = relative_allocation.x;
1408       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1409           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1410         child_allocation.y = (relative_allocation.y +
1411                               relative_allocation.height +
1412                               scrollbar_spacing +
1413                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1414                                0 : widget->style->ythickness));
1415       else
1416         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1417
1418       child_allocation.width = relative_allocation.width;
1419       child_allocation.height = hscrollbar_requisition.height;
1420       child_allocation.x += allocation->x;
1421       child_allocation.y += allocation->y;
1422
1423       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1424         {
1425           if (!scrollbars_within_bevel)
1426             {
1427               child_allocation.x -= widget->style->xthickness;
1428               child_allocation.width += 2 * widget->style->xthickness;
1429             }
1430           else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
1431                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1432             {
1433               child_allocation.y -= widget->style->ythickness;
1434             }
1435           else
1436             {
1437               child_allocation.y += widget->style->ythickness;
1438             }
1439         }
1440
1441       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1442     }
1443   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1444     gtk_widget_hide (scrolled_window->hscrollbar);
1445
1446   if (scrolled_window->vscrollbar_visible)
1447     {
1448       GtkRequisition vscrollbar_requisition;
1449       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1450         gtk_widget_show (scrolled_window->vscrollbar);
1451
1452       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1453                                         &vscrollbar_requisition);
1454
1455       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1456            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1457             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1458           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1459            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1460             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1461         child_allocation.x = (relative_allocation.x +
1462                               relative_allocation.width +
1463                               scrollbar_spacing +
1464                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1465                                0 : widget->style->xthickness));
1466       else
1467         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1468
1469       child_allocation.y = relative_allocation.y;
1470       child_allocation.width = vscrollbar_requisition.width;
1471       child_allocation.height = relative_allocation.height;
1472       child_allocation.x += allocation->x;
1473       child_allocation.y += allocation->y;
1474
1475       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1476         {
1477           if (!scrollbars_within_bevel)
1478             {
1479               child_allocation.y -= widget->style->ythickness;
1480               child_allocation.height += 2 * widget->style->ythickness;
1481             }
1482           else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
1483                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1484             {
1485               child_allocation.x -= widget->style->xthickness;
1486             }
1487           else
1488             {
1489               child_allocation.x += widget->style->xthickness;
1490             }
1491         }
1492
1493       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1494     }
1495   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1496     gtk_widget_hide (scrolled_window->vscrollbar);
1497 }
1498
1499 static gint
1500 gtk_scrolled_window_scroll_event (GtkWidget *widget,
1501                                   GdkEventScroll *event)
1502 {
1503   GtkWidget *range;
1504
1505   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1506   g_return_val_if_fail (event != NULL, FALSE);
1507
1508   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1509     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1510   else
1511     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1512
1513   if (range && GTK_WIDGET_VISIBLE (range))
1514     {
1515       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1516       gdouble delta, new_value;
1517
1518       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1519
1520       new_value = CLAMP (adj->value + delta, adj->lower, adj->upper - adj->page_size);
1521
1522       gtk_adjustment_set_value (adj, new_value);
1523
1524       return TRUE;
1525     }
1526
1527   return FALSE;
1528 }
1529
1530 static gint
1531 gtk_scrolled_window_focus (GtkWidget        *widget,
1532                            GtkDirectionType  direction)
1533 {
1534   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1535   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1536
1537   if (scrolled_window->focus_out)
1538     {
1539       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1540       return FALSE;
1541     }
1542
1543   if (gtk_widget_is_focus (widget))
1544     return FALSE;
1545
1546   /* We only put the scrolled window itself in the focus chain if it
1547    * isn't possible to focus any children.
1548    */
1549   if (GTK_BIN (widget)->child)
1550     {
1551       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1552         return TRUE;
1553     }
1554
1555   if (!had_focus_child)
1556     {
1557       gtk_widget_grab_focus (widget);
1558       return TRUE;
1559     }
1560   else
1561     return FALSE;
1562 }
1563
1564 static void
1565 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1566                                         gpointer       data)
1567 {
1568   GtkScrolledWindow *scrolled_win;
1569
1570   g_return_if_fail (adjustment != NULL);
1571   g_return_if_fail (data != NULL);
1572
1573   scrolled_win = GTK_SCROLLED_WINDOW (data);
1574
1575   if (scrolled_win->hscrollbar &&
1576       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1577     {
1578       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1579         {
1580           gboolean visible;
1581
1582           visible = scrolled_win->hscrollbar_visible;
1583           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1584                                               adjustment->page_size);
1585           if (scrolled_win->hscrollbar_visible != visible)
1586             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1587         }
1588     }
1589   else if (scrolled_win->vscrollbar &&
1590            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1591     {
1592       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1593         {
1594           gboolean visible;
1595
1596           visible = scrolled_win->vscrollbar_visible;
1597           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1598                                               adjustment->page_size);
1599           if (scrolled_win->vscrollbar_visible != visible)
1600             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1601         }
1602     }
1603 }
1604
1605 static void
1606 gtk_scrolled_window_add (GtkContainer *container,
1607                          GtkWidget    *child)
1608 {
1609   GtkScrolledWindow *scrolled_window;
1610   GtkBin *bin;
1611
1612   bin = GTK_BIN (container);
1613   g_return_if_fail (bin->child == NULL);
1614
1615   scrolled_window = GTK_SCROLLED_WINDOW (container);
1616
1617   bin->child = child;
1618   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1619
1620   /* this is a temporary message */
1621   if (!gtk_widget_set_scroll_adjustments (child,
1622                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1623                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1624     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1625                "use gtk_scrolled_window_add_with_viewport() instead");
1626 }
1627
1628 static void
1629 gtk_scrolled_window_remove (GtkContainer *container,
1630                             GtkWidget    *child)
1631 {
1632   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1633   g_return_if_fail (child != NULL);
1634   g_return_if_fail (GTK_BIN (container)->child == child);
1635
1636   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1637
1638   /* chain parent class handler to remove child */
1639   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1640 }
1641
1642 void
1643 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1644                                        GtkWidget         *child)
1645 {
1646   GtkBin *bin;
1647   GtkWidget *viewport;
1648
1649   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1650   g_return_if_fail (GTK_IS_WIDGET (child));
1651   g_return_if_fail (child->parent == NULL);
1652
1653   bin = GTK_BIN (scrolled_window);
1654
1655   if (bin->child != NULL)
1656     {
1657       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1658       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1659
1660       viewport = bin->child;
1661     }
1662   else
1663     {
1664       viewport =
1665         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1666                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1667       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1668     }
1669
1670   gtk_widget_show (viewport);
1671   gtk_container_add (GTK_CONTAINER (viewport), child);
1672 }
1673
1674 /**
1675  * _gtk_scrolled_window_get_spacing:
1676  * @scrolled_window: a scrolled window
1677  *
1678  * Gets the spacing between the scrolled window's scrollbars and
1679  * the scrolled widget. Used by GtkCombo
1680  *
1681  * Return value: the spacing, in pixels.
1682  **/
1683 gint
1684 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1685 {
1686   GtkScrolledWindowClass *class;
1687
1688   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1689
1690   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1691
1692   if (class->scrollbar_spacing >= 0)
1693     return class->scrollbar_spacing;
1694   else
1695     {
1696       gint scrollbar_spacing;
1697
1698       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1699                             "scrollbar-spacing", &scrollbar_spacing,
1700                             NULL);
1701
1702       return scrollbar_spacing;
1703     }
1704 }
1705
1706 #define __GTK_SCROLLED_WINDOW_C__
1707 #include "gtkaliasdef.c"