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_usize().
  47  *
  48  * a scrolled window needs (for imlementing 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   gtk_widget_class_install_style_property (widget_class,
 284                                            g_param_spec_boolean ("scrollbars-within-bevel",
 285                                                                  P_("Scrollbars within bevel"),
 286                                                                  P_("Place scrollbars within the scrolled window's bevel"),
 287                                                                  FALSE,
 288                                                                  GTK_PARAM_READABLE));
 289
 290   gtk_widget_class_install_style_property (widget_class,
 291                                            g_param_spec_int ("scrollbar-spacing",
 292                                                              P_("Scrollbar spacing"),
 293                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 294                                                              0,
 295                                                              G_MAXINT,
 296                                                              DEFAULT_SCROLLBAR_SPACING,
 297                                                              GTK_PARAM_READABLE));
 298
 299   /**
 300    * GtkSettings:gtk-scrolled-window-placement:
 301    *
 302    * Where the contents of scrolled windows are located with respect to the
 303    * scrollbars, if not overridden by the scrolled window's own placement.
 304    *
 305    * Since: 2.10
 306    */
 307   gtk_settings_install_property (g_param_spec_enum ("gtk-scrolled-window-placement",
 308                                                     P_("Scrolled Window Placement"),
 309                                                     P_("Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement."),
 310                                                     GTK_TYPE_CORNER_TYPE,
 311                                                     GTK_CORNER_TOP_LEFT,
 312                                                     G_PARAM_READABLE | G_PARAM_WRITABLE));
 313
 314
 315   signals[SCROLL_CHILD] =
 316     g_signal_new (I_("scroll_child"),
 317                   G_TYPE_FROM_CLASS (object_class),
 318                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 319                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 320                   NULL, NULL,
 321                   _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
 322                   G_TYPE_BOOLEAN, 2,
 323                   GTK_TYPE_SCROLL_TYPE,
 324                   G_TYPE_BOOLEAN);
 325   signals[MOVE_FOCUS_OUT] =
 326     g_signal_new (I_("move_focus_out"),
 327                   G_TYPE_FROM_CLASS (object_class),
 328                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 329                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 330                   NULL, NULL,
 331                   _gtk_marshal_VOID__ENUM,
 332                   G_TYPE_NONE, 1,
 333                   GTK_TYPE_DIRECTION_TYPE);
 334
 335   binding_set = gtk_binding_set_by_class (class);
 336
 337   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 338   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 339   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 340   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 341
 342   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 343   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 344   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 345   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 346
 347   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 348   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 349   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 350   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 351
 352   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 353   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 354
 355   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 356 }
 357
 358 static void
 359 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 360 {
 361   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 362
 363   scrolled_window->hscrollbar = NULL;
 364   scrolled_window->vscrollbar = NULL;
 365   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 366   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 367   scrolled_window->hscrollbar_visible = FALSE;
 368   scrolled_window->vscrollbar_visible = FALSE;
 369   scrolled_window->focus_out = FALSE;
 370   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 371   gtk_scrolled_window_update_real_placement (scrolled_window);
 372 }
 373
 374 GtkWidget*
 375 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 376                          GtkAdjustment *vadjustment)
 377 {
 378   GtkWidget *scrolled_window;
 379
 380   if (hadjustment)
 381     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 382
 383   if (vadjustment)
 384     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 385
 386   scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
 387                                     "hadjustment", hadjustment,
 388                                     "vadjustment", vadjustment,
 389                                     NULL);
 390
 391   return scrolled_window;
 392 }
 393
 394 void
 395 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 396                                      GtkAdjustment     *hadjustment)
 397 {
 398   GtkBin *bin;
 399
 400   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 401   if (hadjustment)
 402     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 403   else
 404     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 405
 406   bin = GTK_BIN (scrolled_window);
 407
 408   if (!scrolled_window->hscrollbar)
 409     {
 410       gtk_widget_push_composite_child ();
 411       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 412       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 413       gtk_widget_pop_composite_child ();
 414
 415       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 416       g_object_ref (scrolled_window->hscrollbar);
 417       gtk_widget_show (scrolled_window->hscrollbar);
 418     }
 419   else
 420     {
 421       GtkAdjustment *old_adjustment;
 422
 423       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 424       if (old_adjustment == hadjustment)
 425         return;
 426
 427       g_signal_handlers_disconnect_by_func (old_adjustment,
 428                                             gtk_scrolled_window_adjustment_changed,
 429                                             scrolled_window);
 430       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 431                                 hadjustment);
 432     }
 433   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 434   g_signal_connect (hadjustment,
 435                     "changed",
 436                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 437                     scrolled_window);
 438   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 439
 440   if (bin->child)
 441     gtk_widget_set_scroll_adjustments (bin->child,
 442                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 443                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 444
 445   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 446 }
 447
 448 void
 449 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 450                                      GtkAdjustment     *vadjustment)
 451 {
 452   GtkBin *bin;
 453
 454   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 455   if (vadjustment)
 456     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 457   else
 458     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 459
 460   bin = GTK_BIN (scrolled_window);
 461
 462   if (!scrolled_window->vscrollbar)
 463     {
 464       gtk_widget_push_composite_child ();
 465       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 466       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 467       gtk_widget_pop_composite_child ();
 468
 469       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 470       g_object_ref (scrolled_window->vscrollbar);
 471       gtk_widget_show (scrolled_window->vscrollbar);
 472     }
 473   else
 474     {
 475       GtkAdjustment *old_adjustment;
 476
 477       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 478       if (old_adjustment == vadjustment)
 479         return;
 480
 481       g_signal_handlers_disconnect_by_func (old_adjustment,
 482                                             gtk_scrolled_window_adjustment_changed,
 483                                             scrolled_window);
 484       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 485                                 vadjustment);
 486     }
 487   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 488   g_signal_connect (vadjustment,
 489                     "changed",
 490                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 491                     scrolled_window);
 492   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 493
 494   if (bin->child)
 495     gtk_widget_set_scroll_adjustments (bin->child,
 496                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 497                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 498
 499   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 500 }
 501
 502 GtkAdjustment*
 503 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 504 {
 505   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 506
 507   return (scrolled_window->hscrollbar ?
 508           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 509           NULL);
 510 }
 511
 512 GtkAdjustment*
 513 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 514 {
 515   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 516
 517   return (scrolled_window->vscrollbar ?
 518           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 519           NULL);
 520 }
 521
 522 /**
 523  * gtk_scrolled_window_get_hscrollbar:
 524  * @scrolled_window: a #GtkScrolledWindow
 525  *
 526  * Returns the horizontal scrollbar of @scrolled_window.
 527  *
 528  * Returns: the horizontal scrollbar of the scrolled window, or
 529  *  %NULL if it does not have one.
 530  *
 531  * Since: 2.8
 532  */
 533 GtkWidget*
 534 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 535 {
 536   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 537
 538   return scrolled_window->hscrollbar;
 539 }
 540
 541 /**
 542  * gtk_scrolled_window_get_vscrollbar:
 543  * @scrolled_window: a #GtkScrolledWindow
 544  *
 545  * Returns the vertical scrollbar of @scrolled_window.
 546  *
 547  * Returns: the vertical scrollbar of the scrolled window, or
 548  *  %NULL if it does not have one.
 549  *
 550  * Since: 2.8
 551  */
 552 GtkWidget*
 553 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 554 {
 555   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 556
 557   return scrolled_window->vscrollbar;
 558 }
 559
 560 void
 561 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 562                                 GtkPolicyType      hscrollbar_policy,
 563                                 GtkPolicyType      vscrollbar_policy)
 564 {
 565   GObject *object = G_OBJECT (scrolled_window);
 566
 567   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 568
 569   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 570       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 571     {
 572       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 573       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 574
 575       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 576
 577       g_object_freeze_notify (object);
 578       g_object_notify (object, "hscrollbar-policy");
 579       g_object_notify (object, "vscrollbar-policy");
 580       g_object_thaw_notify (object);
 581     }
 582 }
 583
 584 /**
 585  * gtk_scrolled_window_get_policy:
 586  * @scrolled_window: a #GtkScrolledWindow
 587  * @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 588  * @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 589  *
 590  * Retrieves the current policy values for the horizontal and vertical
 591  * scrollbars. See gtk_scrolled_window_set_policy().
 592  **/
 593 void
 594 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 595                                 GtkPolicyType     *hscrollbar_policy,
 596                                 GtkPolicyType     *vscrollbar_policy)
 597 {
 598   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 599
 600   if (hscrollbar_policy)
 601     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 602   if (vscrollbar_policy)
 603     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 604 }
 605
 606 static void
 607 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 608 {
 609   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 610   GtkSettings *settings;
 611
 612   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 613
 614   if (priv->window_placement_set || settings == NULL)
 615     priv->real_window_placement = scrolled_window->window_placement;
 616   else
 617     g_object_get (settings,
 618                   "gtk-scrolled-window-placement",
 619                   &priv->real_window_placement,
 620                   NULL);
 621 }
 622
 623 static void
 624 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 625                                             GtkCornerType      window_placement)
 626 {
 627   if (scrolled_window->window_placement != window_placement)
 628     {
 629       scrolled_window->window_placement = window_placement;
 630
 631       gtk_scrolled_window_update_real_placement (scrolled_window);
 632       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 633
 634       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 635     }
 636 }
 637
 638 static void
 639 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 640                                        gboolean           placement_set,
 641                                        gboolean           emit_resize)
 642 {
 643   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 644
 645   if (priv->window_placement_set != placement_set)
 646     {
 647       priv->window_placement_set = placement_set;
 648
 649       gtk_scrolled_window_update_real_placement (scrolled_window);
 650       if (emit_resize)
 651         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 652
 653       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 654     }
 655 }
 656
 657 /**
 658  * gtk_scrolled_window_set_placement:
 659  * @scrolled_window: a #GtkScrolledWindow
 660  *
 661  * Sets the placement of the contents with respect to the scrollbars
 662  * for the scrolled window.
 663  *
 664  * See also gtk_scrolled_window_get_placement() and
 665  * gtk_scrolled_window_unset_placement().
 666  **/
 667 void
 668 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 669                                    GtkCornerType      window_placement)
 670 {
 671   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 672
 673   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 674   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 675 }
 676
 677 /**
 678  * gtk_scrolled_window_get_placement:
 679  * @scrolled_window: a #GtkScrolledWindow
 680  *
 681  * Gets the placement of the contents with respect to the scrollbars
 682  * for the scrolled window. See gtk_scrolled_window_set_placement().
 683  *
 684  * Return value: the current placement value.
 685  *
 686  * See also gtk_scrolled_window_set_placement() and
 687  * gtk_scrolled_window_unset_placement().
 688  **/
 689 GtkCornerType
 690 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 691 {
 692   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 693
 694   return scrolled_window->window_placement;
 695 }
 696
 697 /**
 698  * gtk_scrolled_window_unset_placement:
 699  * @scrolled_window: a #GtkScrolledWindow
 700  *
 701  * Unsets the placement of the contents with respect to the scrollbars
 702  * for the scrolled window. If no window placement is set for a scrolled
 703  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 704  *
 705  * See also gtk_scrolled_window_set_placement() and
 706  * gtk_scrolled_window_get_placement().
 707  *
 708  * Since: 2.10
 709  **/
 710 void
 711 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 712 {
 713   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 714
 715   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 716
 717   if (priv->window_placement_set)
 718     {
 719       priv->window_placement_set = FALSE;
 720
 721       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 722
 723       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 724     }
 725 }
 726
 727 /**
 728  * gtk_scrolled_window_set_shadow_type:
 729  * @scrolled_window: a #GtkScrolledWindow
 730  * @type: kind of shadow to draw around scrolled window contents
 731  *
 732  * Changes the type of shadow drawn around the contents of
 733  * @scrolled_window.
 734  *
 735  **/
 736 void
 737 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 738                                      GtkShadowType      type)
 739 {
 740   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 741   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 742
 743   if (scrolled_window->shadow_type != type)
 744     {
 745       scrolled_window->shadow_type = type;
 746
 747       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 748         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 749
 750       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 751
 752       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 753     }
 754 }
 755
 756 /**
 757  * gtk_scrolled_window_get_shadow_type:
 758  * @scrolled_window: a #GtkScrolledWindow
 759  *
 760  * Gets the shadow type of the scrolled window. See
 761  * gtk_scrolled_window_set_shadow_type().
 762  *
 763  * Return value: the current shadow type
 764  **/
 765 GtkShadowType
 766 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 767 {
 768   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 769
 770   return scrolled_window->shadow_type;
 771 }
 772
 773 static void
 774 gtk_scrolled_window_destroy (GtkObject *object)
 775 {
 776   GtkScrolledWindow *scrolled_window;
 777
 778   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
 779
 780   scrolled_window = GTK_SCROLLED_WINDOW (object);
 781
 782   gtk_widget_unparent (scrolled_window->hscrollbar);
 783   gtk_widget_unparent (scrolled_window->vscrollbar);
 784   gtk_widget_destroy (scrolled_window->hscrollbar);
 785   gtk_widget_destroy (scrolled_window->vscrollbar);
 786
 787   GTK_OBJECT_CLASS (gtk_scrolled_window_parent_class)->destroy (object);
 788 }
 789
 790 static void
 791 gtk_scrolled_window_finalize (GObject *object)
 792 {
 793   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 794
 795   g_object_unref (scrolled_window->hscrollbar);
 796   g_object_unref (scrolled_window->vscrollbar);
 797
 798   G_OBJECT_CLASS (gtk_scrolled_window_parent_class)->finalize (object);
 799 }
 800
 801 static void
 802 gtk_scrolled_window_set_property (GObject      *object,
 803                                   guint         prop_id,
 804                                   const GValue *value,
 805                                   GParamSpec   *pspec)
 806 {
 807   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 808
 809   switch (prop_id)
 810     {
 811     case PROP_HADJUSTMENT:
 812       gtk_scrolled_window_set_hadjustment (scrolled_window,
 813                                            g_value_get_object (value));
 814       break;
 815     case PROP_VADJUSTMENT:
 816       gtk_scrolled_window_set_vadjustment (scrolled_window,
 817                                            g_value_get_object (value));
 818       break;
 819     case PROP_HSCROLLBAR_POLICY:
 820       gtk_scrolled_window_set_policy (scrolled_window,
 821                                       g_value_get_enum (value),
 822                                       scrolled_window->vscrollbar_policy);
 823       break;
 824     case PROP_VSCROLLBAR_POLICY:
 825       gtk_scrolled_window_set_policy (scrolled_window,
 826                                       scrolled_window->hscrollbar_policy,
 827                                       g_value_get_enum (value));
 828       break;
 829     case PROP_WINDOW_PLACEMENT:
 830       gtk_scrolled_window_set_placement_internal (scrolled_window,
 831                                                   g_value_get_enum (value));
 832       break;
 833     case PROP_WINDOW_PLACEMENT_SET:
 834       gtk_scrolled_window_set_placement_set (scrolled_window,
 835                                              g_value_get_boolean (value),
 836                                              TRUE);
 837       break;
 838     case PROP_SHADOW_TYPE:
 839       gtk_scrolled_window_set_shadow_type (scrolled_window,
 840                                            g_value_get_enum (value));
 841       break;
 842     default:
 843       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 844       break;
 845     }
 846 }
 847
 848 static void
 849 gtk_scrolled_window_get_property (GObject    *object,
 850                                   guint       prop_id,
 851                                   GValue     *value,
 852                                   GParamSpec *pspec)
 853 {
 854   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 855   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 856
 857   switch (prop_id)
 858     {
 859     case PROP_HADJUSTMENT:
 860       g_value_set_object (value,
 861                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 862       break;
 863     case PROP_VADJUSTMENT:
 864       g_value_set_object (value,
 865                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 866       break;
 867     case PROP_HSCROLLBAR_POLICY:
 868       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 869       break;
 870     case PROP_VSCROLLBAR_POLICY:
 871       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 872       break;
 873     case PROP_WINDOW_PLACEMENT:
 874       g_value_set_enum (value, scrolled_window->window_placement);
 875       break;
 876     case PROP_WINDOW_PLACEMENT_SET:
 877       g_value_set_boolean (value, priv->window_placement_set);
 878       break;
 879     case PROP_SHADOW_TYPE:
 880       g_value_set_enum (value, scrolled_window->shadow_type);
 881       break;
 882     default:
 883       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 884       break;
 885     }
 886 }
 887
 888 static void
 889 traverse_container (GtkWidget *widget,
 890                     gpointer   data)
 891 {
 892   if (GTK_IS_SCROLLED_WINDOW (widget))
 893     {
 894       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 895       gtk_widget_queue_draw (widget);
 896     }
 897   else if (GTK_IS_CONTAINER (widget))
 898     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
 899 }
 900
 901 static void
 902 gtk_scrolled_window_settings_changed (GtkSettings *settings)
 903 {
 904   GList *list, *l;
 905
 906   list = gtk_window_list_toplevels ();
 907
 908   for (l = list; l; l = l->next)
 909     gtk_container_forall (GTK_CONTAINER (l->data),
 910                           traverse_container, NULL);
 911
 912   g_list_free (list);
 913 }
 914
 915 static void
 916 gtk_scrolled_window_screen_changed (GtkWidget *widget,
 917                                     GdkScreen *previous_screen)
 918 {
 919   GtkSettings *settings;
 920   guint window_placement_connection;
 921
 922   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 923
 924   if (!gtk_widget_has_screen (widget))
 925     return;
 926
 927   settings = gtk_widget_get_settings (widget);
 928
 929   window_placement_connection =
 930     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
 931                                          "gtk-scrolled-window-connection"));
 932
 933   if (window_placement_connection)
 934     return;
 935
 936   window_placement_connection =
 937     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
 938                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
 939   g_object_set_data (G_OBJECT (settings),
 940                      I_("gtk-scrolled-window-connection"),
 941                      GUINT_TO_POINTER (window_placement_connection));
 942 }
 943
 944 static void
 945 gtk_scrolled_window_paint (GtkWidget    *widget,
 946                            GdkRectangle *area)
 947 {
 948   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 949
 950   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 951     {
 952       GtkAllocation relative_allocation;
 953       gboolean scrollbars_within_bevel;
 954       gint scrollbar_spacing;
 955
 956       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
 957       gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
 958       scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
 959
 960       relative_allocation.x -= widget->style->xthickness;
 961       relative_allocation.y -= widget->style->ythickness;
 962       relative_allocation.width += 2 * widget->style->xthickness;
 963       relative_allocation.height += 2 * widget->style->ythickness;
 964
 965       if (scrollbars_within_bevel)
 966         {
 967           if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
 968             {
 969               gint dy = scrolled_window->hscrollbar->allocation.height + scrollbar_spacing;
 970               relative_allocation.height += dy;
 971
 972               if (relative_allocation.y)
 973                 relative_allocation.y -= dy;
 974             }
 975
 976           if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
 977             {
 978               gint dx = scrolled_window->vscrollbar->allocation.width + scrollbar_spacing;
 979               relative_allocation.width += dx;
 980
 981               if (relative_allocation.x)
 982                 relative_allocation.x -= dx;
 983             }
 984         }
 985
 986       gtk_paint_shadow (widget->style, widget->window,
 987                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
 988                         area, widget, "scrolled_window",
 989                         widget->allocation.x + relative_allocation.x,
 990                         widget->allocation.y + relative_allocation.y,
 991                         relative_allocation.width,
 992                         relative_allocation.height);
 993     }
 994 }
 995
 996 static gint
 997 gtk_scrolled_window_expose (GtkWidget      *widget,
 998                             GdkEventExpose *event)
 999 {
1000   if (GTK_WIDGET_DRAWABLE (widget))
1001     {
1002       gtk_scrolled_window_paint (widget, &event->area);
1003
1004       (* GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->expose_event) (widget, event);
1005     }
1006
1007   return FALSE;
1008 }
1009
1010 static void
1011 gtk_scrolled_window_forall (GtkContainer *container,
1012                             gboolean      include_internals,
1013                             GtkCallback   callback,
1014                             gpointer      callback_data)
1015 {
1016   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1017   g_return_if_fail (callback != NULL);
1018
1019   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
1020                                               include_internals,
1021                                               callback,
1022                                               callback_data);
1023   if (include_internals)
1024     {
1025       GtkScrolledWindow *scrolled_window;
1026
1027       scrolled_window = GTK_SCROLLED_WINDOW (container);
1028
1029       if (scrolled_window->vscrollbar)
1030         callback (scrolled_window->vscrollbar, callback_data);
1031       if (scrolled_window->hscrollbar)
1032         callback (scrolled_window->hscrollbar, callback_data);
1033     }
1034 }
1035
1036 static gboolean
1037 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1038                                   GtkScrollType      scroll,
1039                                   gboolean           horizontal)
1040 {
1041   GtkAdjustment *adjustment = NULL;
1042
1043   switch (scroll)
1044     {
1045     case GTK_SCROLL_STEP_UP:
1046       scroll = GTK_SCROLL_STEP_BACKWARD;
1047       horizontal = FALSE;
1048       break;
1049     case GTK_SCROLL_STEP_DOWN:
1050       scroll = GTK_SCROLL_STEP_FORWARD;
1051       horizontal = FALSE;
1052       break;
1053     case GTK_SCROLL_STEP_LEFT:
1054       scroll = GTK_SCROLL_STEP_BACKWARD;
1055       horizontal = TRUE;
1056       break;
1057     case GTK_SCROLL_STEP_RIGHT:
1058       scroll = GTK_SCROLL_STEP_FORWARD;
1059       horizontal = TRUE;
1060       break;
1061     case GTK_SCROLL_PAGE_UP:
1062       scroll = GTK_SCROLL_PAGE_BACKWARD;
1063       horizontal = FALSE;
1064       break;
1065     case GTK_SCROLL_PAGE_DOWN:
1066       scroll = GTK_SCROLL_PAGE_FORWARD;
1067       horizontal = FALSE;
1068       break;
1069     case GTK_SCROLL_PAGE_LEFT:
1070       scroll = GTK_SCROLL_STEP_BACKWARD;
1071       horizontal = TRUE;
1072       break;
1073     case GTK_SCROLL_PAGE_RIGHT:
1074       scroll = GTK_SCROLL_STEP_FORWARD;
1075       horizontal = TRUE;
1076       break;
1077     case GTK_SCROLL_STEP_BACKWARD:
1078     case GTK_SCROLL_STEP_FORWARD:
1079     case GTK_SCROLL_PAGE_BACKWARD:
1080     case GTK_SCROLL_PAGE_FORWARD:
1081     case GTK_SCROLL_START:
1082     case GTK_SCROLL_END:
1083       break;
1084     default:
1085       g_warning ("Invalid scroll type %u for GtkSpinButton::change-value", scroll);
1086       return FALSE;
1087     }
1088
1089   if ((horizontal && (!scrolled_window->hscrollbar || !scrolled_window->hscrollbar_visible)) ||
1090       (!horizontal && (!scrolled_window->vscrollbar || !scrolled_window->vscrollbar_visible)))
1091     return FALSE;
1092
1093   if (horizontal)
1094     {
1095       if (scrolled_window->hscrollbar)
1096         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
1097     }
1098   else
1099     {
1100       if (scrolled_window->vscrollbar)
1101         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
1102     }
1103
1104   if (adjustment)
1105     {
1106       gdouble value = adjustment->value;
1107
1108       switch (scroll)
1109         {
1110         case GTK_SCROLL_STEP_FORWARD:
1111           value += adjustment->step_increment;
1112           break;
1113         case GTK_SCROLL_STEP_BACKWARD:
1114           value -= adjustment->step_increment;
1115           break;
1116         case GTK_SCROLL_PAGE_FORWARD:
1117           value += adjustment->page_increment;
1118           break;
1119         case GTK_SCROLL_PAGE_BACKWARD:
1120           value -= adjustment->page_increment;
1121           break;
1122         case GTK_SCROLL_START:
1123           value = adjustment->lower;
1124           break;
1125         case GTK_SCROLL_END:
1126           value = adjustment->upper;
1127           break;
1128         default:
1129           g_assert_not_reached ();
1130           break;
1131         }
1132
1133       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
1134
1135       gtk_adjustment_set_value (adjustment, value);
1136
1137       return TRUE;
1138     }
1139
1140   return FALSE;
1141 }
1142
1143 static void
1144 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1145                                     GtkDirectionType   direction_type)
1146 {
1147   GtkWidget *toplevel;
1148
1149   /* Focus out of the scrolled window entirely. We do this by setting
1150    * a flag, then propagating the focus motion to the notebook.
1151    */
1152   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1153   if (!GTK_WIDGET_TOPLEVEL (toplevel))
1154     return;
1155
1156   g_object_ref (scrolled_window);
1157
1158   scrolled_window->focus_out = TRUE;
1159   g_signal_emit_by_name (toplevel, "move_focus", direction_type);
1160   scrolled_window->focus_out = FALSE;
1161
1162   g_object_unref (scrolled_window);
1163 }
1164
1165 static void
1166 gtk_scrolled_window_size_request (GtkWidget      *widget,
1167                                   GtkRequisition *requisition)
1168 {
1169   GtkScrolledWindow *scrolled_window;
1170   GtkBin *bin;
1171   gint extra_width;
1172   gint extra_height;
1173   gint scrollbar_spacing;
1174   GtkRequisition hscrollbar_requisition;
1175   GtkRequisition vscrollbar_requisition;
1176   GtkRequisition child_requisition;
1177
1178   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1179   g_return_if_fail (requisition != NULL);
1180
1181   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1182   bin = GTK_BIN (scrolled_window);
1183
1184   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1185
1186   extra_width = 0;
1187   extra_height = 0;
1188   requisition->width = 0;
1189   requisition->height = 0;
1190
1191   gtk_widget_size_request (scrolled_window->hscrollbar,
1192                            &hscrollbar_requisition);
1193   gtk_widget_size_request (scrolled_window->vscrollbar,
1194                            &vscrollbar_requisition);
1195
1196   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1197     {
1198       gtk_widget_size_request (bin->child, &child_requisition);
1199
1200       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1201         requisition->width += child_requisition.width;
1202       else
1203         {
1204           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1205
1206           if (aux_info && aux_info->width > 0)
1207             {
1208               requisition->width += aux_info->width;
1209               extra_width = -1;
1210             }
1211           else
1212             requisition->width += vscrollbar_requisition.width;
1213         }
1214
1215       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1216         requisition->height += child_requisition.height;
1217       else
1218         {
1219           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1220
1221           if (aux_info && aux_info->height > 0)
1222             {
1223               requisition->height += aux_info->height;
1224               extra_height = -1;
1225             }
1226           else
1227             requisition->height += hscrollbar_requisition.height;
1228         }
1229     }
1230
1231   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1232       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1233     {
1234       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
1235       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1236         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1237     }
1238
1239   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1240       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1241     {
1242       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
1243       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1244         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1245     }
1246
1247   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
1248   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
1249
1250   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1251     {
1252       requisition->width += 2 * widget->style->xthickness;
1253       requisition->height += 2 * widget->style->ythickness;
1254     }
1255 }
1256
1257 static void
1258 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1259                                          GtkAllocation *allocation)
1260 {
1261   GtkScrolledWindow *scrolled_window;
1262   GtkScrolledWindowPrivate *priv;
1263   gint scrollbar_spacing;
1264
1265   g_return_if_fail (widget != NULL);
1266   g_return_if_fail (allocation != NULL);
1267
1268   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1269   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1270
1271   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1272
1273   allocation->x = GTK_CONTAINER (widget)->border_width;
1274   allocation->y = GTK_CONTAINER (widget)->border_width;
1275
1276   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1277     {
1278       allocation->x += widget->style->xthickness;
1279       allocation->y += widget->style->ythickness;
1280     }
1281
1282   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1283   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1284
1285   if (scrolled_window->vscrollbar_visible)
1286     {
1287       GtkRequisition vscrollbar_requisition;
1288       gboolean is_rtl;
1289
1290       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1291                                         &vscrollbar_requisition);
1292       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1293
1294       if ((!is_rtl &&
1295            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1296             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1297           (is_rtl &&
1298            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1299             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1300         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1301
1302       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1303     }
1304   if (scrolled_window->hscrollbar_visible)
1305     {
1306       GtkRequisition hscrollbar_requisition;
1307       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1308                                         &hscrollbar_requisition);
1309
1310       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1311           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1312         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1313
1314       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1315     }
1316 }
1317
1318 static void
1319 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1320                                    GtkAllocation *allocation)
1321 {
1322   GtkScrolledWindow *scrolled_window;
1323   GtkScrolledWindowPrivate *priv;
1324   GtkBin *bin;
1325   GtkAllocation relative_allocation;
1326   GtkAllocation child_allocation;
1327   gboolean scrollbars_within_bevel;
1328   gint scrollbar_spacing;
1329
1330   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1331   g_return_if_fail (allocation != NULL);
1332
1333   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1334   bin = GTK_BIN (scrolled_window);
1335
1336   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1337   gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1338
1339   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1340
1341   widget->allocation = *allocation;
1342
1343   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1344     scrolled_window->hscrollbar_visible = TRUE;
1345   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1346     scrolled_window->hscrollbar_visible = FALSE;
1347   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1348     scrolled_window->vscrollbar_visible = TRUE;
1349   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1350     scrolled_window->vscrollbar_visible = FALSE;
1351
1352   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1353     {
1354       gboolean previous_hvis;
1355       gboolean previous_vvis;
1356       guint count = 0;
1357
1358       do
1359         {
1360           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1361
1362           child_allocation.x = relative_allocation.x + allocation->x;
1363           child_allocation.y = relative_allocation.y + allocation->y;
1364           child_allocation.width = relative_allocation.width;
1365           child_allocation.height = relative_allocation.height;
1366
1367           previous_hvis = scrolled_window->hscrollbar_visible;
1368           previous_vvis = scrolled_window->vscrollbar_visible;
1369
1370           gtk_widget_size_allocate (bin->child, &child_allocation);
1371
1372           /* If, after the first iteration, the hscrollbar and the
1373            * vscrollbar flip visiblity, then we need both.
1374            */
1375           if (count &&
1376               previous_hvis != scrolled_window->hscrollbar_visible &&
1377               previous_vvis != scrolled_window->vscrollbar_visible)
1378             {
1379               scrolled_window->hscrollbar_visible = TRUE;
1380               scrolled_window->vscrollbar_visible = TRUE;
1381
1382               /* a new resize is already queued at this point,
1383                * so we will immediatedly get reinvoked
1384                */
1385               return;
1386             }
1387
1388           count++;
1389         }
1390       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1391              previous_vvis != scrolled_window->vscrollbar_visible);
1392     }
1393   else
1394     {
1395       scrolled_window->hscrollbar_visible = scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS;
1396       scrolled_window->vscrollbar_visible = scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS;
1397       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1398     }
1399
1400   if (scrolled_window->hscrollbar_visible)
1401     {
1402       GtkRequisition hscrollbar_requisition;
1403       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1404                                         &hscrollbar_requisition);
1405
1406       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1407         gtk_widget_show (scrolled_window->hscrollbar);
1408
1409       child_allocation.x = relative_allocation.x;
1410       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1411           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1412         child_allocation.y = (relative_allocation.y +
1413                               relative_allocation.height +
1414                               scrollbar_spacing +
1415                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1416                                0 : widget->style->ythickness));
1417       else
1418         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1419
1420       child_allocation.width = relative_allocation.width;
1421       child_allocation.height = hscrollbar_requisition.height;
1422       child_allocation.x += allocation->x;
1423       child_allocation.y += allocation->y;
1424
1425       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1426         {
1427           if (!scrollbars_within_bevel)
1428             {
1429               child_allocation.x -= widget->style->xthickness;
1430               child_allocation.width += 2 * widget->style->xthickness;
1431             }
1432           else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
1433                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1434             {
1435               child_allocation.y -= widget->style->ythickness;
1436             }
1437           else
1438             {
1439               child_allocation.y += widget->style->ythickness;
1440             }
1441         }
1442
1443       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1444     }
1445   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1446     gtk_widget_hide (scrolled_window->hscrollbar);
1447
1448   if (scrolled_window->vscrollbar_visible)
1449     {
1450       GtkRequisition vscrollbar_requisition;
1451       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1452         gtk_widget_show (scrolled_window->vscrollbar);
1453
1454       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1455                                         &vscrollbar_requisition);
1456
1457       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1458            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1459             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1460           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1461            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1462             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1463         child_allocation.x = (relative_allocation.x +
1464                               relative_allocation.width +
1465                               scrollbar_spacing +
1466                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1467                                0 : widget->style->xthickness));
1468       else
1469         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1470
1471       child_allocation.y = relative_allocation.y;
1472       child_allocation.width = vscrollbar_requisition.width;
1473       child_allocation.height = relative_allocation.height;
1474       child_allocation.x += allocation->x;
1475       child_allocation.y += allocation->y;
1476
1477       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1478         {
1479           if (!scrollbars_within_bevel)
1480             {
1481               child_allocation.y -= widget->style->ythickness;
1482               child_allocation.height += 2 * widget->style->ythickness;
1483             }
1484           else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
1485                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1486             {
1487               child_allocation.x -= widget->style->xthickness;
1488             }
1489           else
1490             {
1491               child_allocation.x += widget->style->xthickness;
1492             }
1493         }
1494
1495       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1496     }
1497   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1498     gtk_widget_hide (scrolled_window->vscrollbar);
1499 }
1500
1501 static gint
1502 gtk_scrolled_window_scroll_event (GtkWidget *widget,
1503                                   GdkEventScroll *event)
1504 {
1505   GtkWidget *range;
1506
1507   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1508   g_return_val_if_fail (event != NULL, FALSE);
1509
1510   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1511     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1512   else
1513     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1514
1515   if (range && GTK_WIDGET_VISIBLE (range))
1516     {
1517       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1518       gdouble delta, new_value;
1519
1520       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1521
1522       new_value = CLAMP (adj->value + delta, adj->lower, adj->upper - adj->page_size);
1523
1524       gtk_adjustment_set_value (adj, new_value);
1525
1526       return TRUE;
1527     }
1528
1529   return FALSE;
1530 }
1531
1532 static gint
1533 gtk_scrolled_window_focus (GtkWidget        *widget,
1534                            GtkDirectionType  direction)
1535 {
1536   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1537   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1538
1539   if (scrolled_window->focus_out)
1540     {
1541       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1542       return FALSE;
1543     }
1544
1545   if (gtk_widget_is_focus (widget))
1546     return FALSE;
1547
1548   /* We only put the scrolled window itself in the focus chain if it
1549    * isn't possible to focus any children.
1550    */
1551   if (GTK_BIN (widget)->child)
1552     {
1553       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1554         return TRUE;
1555     }
1556
1557   if (!had_focus_child)
1558     {
1559       gtk_widget_grab_focus (widget);
1560       return TRUE;
1561     }
1562   else
1563     return FALSE;
1564 }
1565
1566 static void
1567 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1568                                         gpointer       data)
1569 {
1570   GtkScrolledWindow *scrolled_win;
1571
1572   g_return_if_fail (adjustment != NULL);
1573   g_return_if_fail (data != NULL);
1574
1575   scrolled_win = GTK_SCROLLED_WINDOW (data);
1576
1577   if (scrolled_win->hscrollbar &&
1578       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1579     {
1580       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1581         {
1582           gboolean visible;
1583
1584           visible = scrolled_win->hscrollbar_visible;
1585           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1586                                               adjustment->page_size);
1587           if (scrolled_win->hscrollbar_visible != visible)
1588             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1589         }
1590     }
1591   else if (scrolled_win->vscrollbar &&
1592            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1593     {
1594       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1595         {
1596           gboolean visible;
1597
1598           visible = scrolled_win->vscrollbar_visible;
1599           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1600                                               adjustment->page_size);
1601           if (scrolled_win->vscrollbar_visible != visible)
1602             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1603         }
1604     }
1605 }
1606
1607 static void
1608 gtk_scrolled_window_add (GtkContainer *container,
1609                          GtkWidget    *child)
1610 {
1611   GtkScrolledWindow *scrolled_window;
1612   GtkBin *bin;
1613
1614   bin = GTK_BIN (container);
1615   g_return_if_fail (bin->child == NULL);
1616
1617   scrolled_window = GTK_SCROLLED_WINDOW (container);
1618
1619   bin->child = child;
1620   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1621
1622   /* this is a temporary message */
1623   if (!gtk_widget_set_scroll_adjustments (child,
1624                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1625                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1626     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1627                "use gtk_scrolled_window_add_with_viewport() instead");
1628 }
1629
1630 static void
1631 gtk_scrolled_window_remove (GtkContainer *container,
1632                             GtkWidget    *child)
1633 {
1634   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1635   g_return_if_fail (child != NULL);
1636   g_return_if_fail (GTK_BIN (container)->child == child);
1637
1638   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1639
1640   /* chain parent class handler to remove child */
1641   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1642 }
1643
1644 void
1645 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1646                                        GtkWidget         *child)
1647 {
1648   GtkBin *bin;
1649   GtkWidget *viewport;
1650
1651   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1652   g_return_if_fail (GTK_IS_WIDGET (child));
1653   g_return_if_fail (child->parent == NULL);
1654
1655   bin = GTK_BIN (scrolled_window);
1656
1657   if (bin->child != NULL)
1658     {
1659       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1660       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1661
1662       viewport = bin->child;
1663     }
1664   else
1665     {
1666       viewport =
1667         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1668                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1669       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1670     }
1671
1672   gtk_widget_show (viewport);
1673   gtk_container_add (GTK_CONTAINER (viewport), child);
1674 }
1675
1676 /**
1677  * _gtk_scrolled_window_get_spacing:
1678  * @scrolled_window: a scrolled window
1679  *
1680  * Gets the spacing between the scrolled window's scrollbars and
1681  * the scrolled widget. Used by GtkCombo
1682  *
1683  * Return value: the spacing, in pixels.
1684  **/
1685 gint
1686 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1687 {
1688   GtkScrolledWindowClass *class;
1689
1690   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1691
1692   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1693
1694   if (class->scrollbar_spacing >= 0)
1695     return class->scrollbar_spacing;
1696   else
1697     {
1698       gint scrollbar_spacing;
1699
1700       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1701                             "scrollbar-spacing", &scrollbar_spacing,
1702                             NULL);
1703
1704       return scrollbar_spacing;
1705     }
1706 }
1707
1708 #define __GTK_SCROLLED_WINDOW_C__
1709 #include "gtkaliasdef.c"