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 };
  93
  94 /* Signals */
  95 enum
  96 {
  97   SCROLL_CHILD,
  98   MOVE_FOCUS_OUT,
  99   LAST_SIGNAL
 100 };
 101
 102 static void     gtk_scrolled_window_destroy            (GtkObject         *object);
 103 static void     gtk_scrolled_window_set_property       (GObject           *object,
 104                                                         guint              prop_id,
 105                                                         const GValue      *value,
 106                                                         GParamSpec        *pspec);
 107 static void     gtk_scrolled_window_get_property       (GObject           *object,
 108                                                         guint              prop_id,
 109                                                         GValue            *value,
 110                                                         GParamSpec        *pspec);
 111
 112 static void     gtk_scrolled_window_screen_changed     (GtkWidget         *widget,
 113                                                         GdkScreen         *previous_screen);
 114 static gboolean gtk_scrolled_window_expose             (GtkWidget         *widget,
 115                                                         GdkEventExpose    *event);
 116 static void     gtk_scrolled_window_size_request       (GtkWidget         *widget,
 117                                                         GtkRequisition    *requisition);
 118 static void     gtk_scrolled_window_size_allocate      (GtkWidget         *widget,
 119                                                         GtkAllocation     *allocation);
 120 static gboolean gtk_scrolled_window_scroll_event       (GtkWidget         *widget,
 121                                                         GdkEventScroll    *event);
 122 static gboolean gtk_scrolled_window_focus              (GtkWidget         *widget,
 123                                                         GtkDirectionType   direction);
 124 static void     gtk_scrolled_window_add                (GtkContainer      *container,
 125                                                         GtkWidget         *widget);
 126 static void     gtk_scrolled_window_remove             (GtkContainer      *container,
 127                                                         GtkWidget         *widget);
 128 static void     gtk_scrolled_window_forall             (GtkContainer      *container,
 129                                                         gboolean           include_internals,
 130                                                         GtkCallback        callback,
 131                                                         gpointer           callback_data);
 132 static gboolean gtk_scrolled_window_scroll_child       (GtkScrolledWindow *scrolled_window,
 133                                                         GtkScrollType      scroll,
 134                                                         gboolean           horizontal);
 135 static void     gtk_scrolled_window_move_focus_out     (GtkScrolledWindow *scrolled_window,
 136                                                         GtkDirectionType   direction_type);
 137
 138 static void     gtk_scrolled_window_relative_allocation(GtkWidget         *widget,
 139                                                         GtkAllocation     *allocation);
 140 static void     gtk_scrolled_window_adjustment_changed (GtkAdjustment     *adjustment,
 141                                                         gpointer           data);
 142
 143 static void  gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window);
 144
 145 static guint signals[LAST_SIGNAL] = {0};
 146
 147 G_DEFINE_TYPE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN)
 148
 149 static void
 150 add_scroll_binding (GtkBindingSet  *binding_set,
 151                     guint           keyval,
 152                     GdkModifierType mask,
 153                     GtkScrollType   scroll,
 154                     gboolean        horizontal)
 155 {
 156   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 157
 158   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 159                                 "scroll-child", 2,
 160                                 GTK_TYPE_SCROLL_TYPE, scroll,
 161                                 G_TYPE_BOOLEAN, horizontal);
 162   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 163                                 "scroll-child", 2,
 164                                 GTK_TYPE_SCROLL_TYPE, scroll,
 165                                 G_TYPE_BOOLEAN, horizontal);
 166 }
 167
 168 static void
 169 add_tab_bindings (GtkBindingSet    *binding_set,
 170                   GdkModifierType   modifiers,
 171                   GtkDirectionType  direction)
 172 {
 173   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 174                                 "move-focus-out", 1,
 175                                 GTK_TYPE_DIRECTION_TYPE, direction);
 176   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 177                                 "move-focus-out", 1,
 178                                 GTK_TYPE_DIRECTION_TYPE, direction);
 179 }
 180
 181 static void
 182 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 183 {
 184   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 185   GtkObjectClass *object_class;
 186   GtkWidgetClass *widget_class;
 187   GtkContainerClass *container_class;
 188   GtkBindingSet *binding_set;
 189
 190   object_class = (GtkObjectClass*) class;
 191   widget_class = (GtkWidgetClass*) class;
 192   container_class = (GtkContainerClass*) class;
 193
 194   gobject_class->set_property = gtk_scrolled_window_set_property;
 195   gobject_class->get_property = gtk_scrolled_window_get_property;
 196
 197   object_class->destroy = gtk_scrolled_window_destroy;
 198
 199   widget_class->screen_changed = gtk_scrolled_window_screen_changed;
 200   widget_class->expose_event = gtk_scrolled_window_expose;
 201   widget_class->size_request = gtk_scrolled_window_size_request;
 202   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 203   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 204   widget_class->focus = gtk_scrolled_window_focus;
 205
 206   container_class->add = gtk_scrolled_window_add;
 207   container_class->remove = gtk_scrolled_window_remove;
 208   container_class->forall = gtk_scrolled_window_forall;
 209
 210   class->scrollbar_spacing = -1;
 211
 212   class->scroll_child = gtk_scrolled_window_scroll_child;
 213   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 214
 215   g_object_class_install_property (gobject_class,
 216                                    PROP_HADJUSTMENT,
 217                                    g_param_spec_object ("hadjustment",
 218                                                         P_("Horizontal Adjustment"),
 219                                                         P_("The GtkAdjustment for the horizontal position"),
 220                                                         GTK_TYPE_ADJUSTMENT,
 221                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 222   g_object_class_install_property (gobject_class,
 223                                    PROP_VADJUSTMENT,
 224                                    g_param_spec_object ("vadjustment",
 225                                                         P_("Vertical Adjustment"),
 226                                                         P_("The GtkAdjustment for the vertical position"),
 227                                                         GTK_TYPE_ADJUSTMENT,
 228                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 229   g_object_class_install_property (gobject_class,
 230                                    PROP_HSCROLLBAR_POLICY,
 231                                    g_param_spec_enum ("hscrollbar-policy",
 232                                                       P_("Horizontal Scrollbar Policy"),
 233                                                       P_("When the horizontal scrollbar is displayed"),
 234                                                       GTK_TYPE_POLICY_TYPE,
 235                                                       GTK_POLICY_ALWAYS,
 236                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 237   g_object_class_install_property (gobject_class,
 238                                    PROP_VSCROLLBAR_POLICY,
 239                                    g_param_spec_enum ("vscrollbar-policy",
 240                                                       P_("Vertical Scrollbar Policy"),
 241                                                       P_("When the vertical scrollbar is displayed"),
 242                                                       GTK_TYPE_POLICY_TYPE,
 243                                                       GTK_POLICY_ALWAYS,
 244                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 245
 246   g_object_class_install_property (gobject_class,
 247                                    PROP_WINDOW_PLACEMENT,
 248                                    g_param_spec_enum ("window-placement",
 249                                                       P_("Window Placement"),
 250                                                       P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
 251                                                       GTK_TYPE_CORNER_TYPE,
 252                                                       GTK_CORNER_TOP_LEFT,
 253                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 254
 255   /**
 256    * GtkScrolledWindow:window-placement-set:
 257    *
 258    * Whether "window-placement" should be used to determine the location
 259    * of the contents with respect to the scrollbars. Otherwise, the
 260    * "gtk-scrolled-window-placement" setting is used.
 261    *
 262    * Since: 2.10
 263    */
 264   g_object_class_install_property (gobject_class,
 265                                    PROP_WINDOW_PLACEMENT_SET,
 266                                    g_param_spec_boolean ("window-placement-set",
 267                                                          P_("Window Placement Set"),
 268                                                          P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
 269                                                          FALSE,
 270                                                          GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 271   g_object_class_install_property (gobject_class,
 272                                    PROP_SHADOW_TYPE,
 273                                    g_param_spec_enum ("shadow-type",
 274                                                       P_("Shadow Type"),
 275                                                       P_("Style of bevel around the contents"),
 276                                                       GTK_TYPE_SHADOW_TYPE,
 277                                                       GTK_SHADOW_NONE,
 278                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 279
 280   /**
 281    * GtkScrolledWindow:scrollbars-within-bevel:
 282    *
 283    * Whether to place scrollbars within the scrolled window's bevel.
 284    *
 285    * Since: 2.12
 286    */
 287   gtk_widget_class_install_style_property (widget_class,
 288                                            g_param_spec_boolean ("scrollbars-within-bevel",
 289                                                                  P_("Scrollbars within bevel"),
 290                                                                  P_("Place scrollbars within the scrolled window's bevel"),
 291                                                                  FALSE,
 292                                                                  GTK_PARAM_READABLE));
 293
 294   gtk_widget_class_install_style_property (widget_class,
 295                                            g_param_spec_int ("scrollbar-spacing",
 296                                                              P_("Scrollbar spacing"),
 297                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 298                                                              0,
 299                                                              G_MAXINT,
 300                                                              DEFAULT_SCROLLBAR_SPACING,
 301                                                              GTK_PARAM_READABLE));
 302
 303   /**
 304    * GtkSettings:gtk-scrolled-window-placement:
 305    *
 306    * Where the contents of scrolled windows are located with respect to the
 307    * scrollbars, if not overridden by the scrolled window's own placement.
 308    *
 309    * Since: 2.10
 310    */
 311   gtk_settings_install_property (g_param_spec_enum ("gtk-scrolled-window-placement",
 312                                                     P_("Scrolled Window Placement"),
 313                                                     P_("Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement."),
 314                                                     GTK_TYPE_CORNER_TYPE,
 315                                                     GTK_CORNER_TOP_LEFT,
 316                                                     G_PARAM_READABLE | G_PARAM_WRITABLE));
 317
 318
 319   signals[SCROLL_CHILD] =
 320     g_signal_new (I_("scroll-child"),
 321                   G_TYPE_FROM_CLASS (object_class),
 322                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 323                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 324                   NULL, NULL,
 325                   _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
 326                   G_TYPE_BOOLEAN, 2,
 327                   GTK_TYPE_SCROLL_TYPE,
 328                   G_TYPE_BOOLEAN);
 329   signals[MOVE_FOCUS_OUT] =
 330     g_signal_new (I_("move-focus-out"),
 331                   G_TYPE_FROM_CLASS (object_class),
 332                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 333                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 334                   NULL, NULL,
 335                   _gtk_marshal_VOID__ENUM,
 336                   G_TYPE_NONE, 1,
 337                   GTK_TYPE_DIRECTION_TYPE);
 338
 339   binding_set = gtk_binding_set_by_class (class);
 340
 341   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 342   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 343   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 344   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 345
 346   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 347   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 348   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 349   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 350
 351   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 352   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 353   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 354   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 355
 356   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 357   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 358
 359   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 360 }
 361
 362 static void
 363 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 364 {
 365   gtk_widget_set_has_window (GTK_WIDGET (scrolled_window), FALSE);
 366   gtk_widget_set_can_focus (GTK_WIDGET (scrolled_window), TRUE);
 367
 368   scrolled_window->hscrollbar = NULL;
 369   scrolled_window->vscrollbar = NULL;
 370   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 371   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 372   scrolled_window->hscrollbar_visible = FALSE;
 373   scrolled_window->vscrollbar_visible = FALSE;
 374   scrolled_window->focus_out = FALSE;
 375   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 376   gtk_scrolled_window_update_real_placement (scrolled_window);
 377 }
 378
 379 /**
 380  * gtk_scrolled_window_new:
 381  * @hadjustment: (allow-none): horizontal adjustment
 382  * @vadjustment: (allow-none): vertical adjustment
 383  *
 384  * Creates a new scrolled window.
 385  *
 386  * The two arguments are the scrolled window's adjustments; these will be
 387  * shared with the scrollbars and the child widget to keep the bars in sync
 388  * with the child. Usually you want to pass %NULL for the adjustments, which
 389  * will cause the scrolled window to create them for you.
 390  *
 391  * Returns: a new scrolled window
 392  */
 393 GtkWidget*
 394 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 395                          GtkAdjustment *vadjustment)
 396 {
 397   GtkWidget *scrolled_window;
 398
 399   if (hadjustment)
 400     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 401
 402   if (vadjustment)
 403     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 404
 405   scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
 406                                     "hadjustment", hadjustment,
 407                                     "vadjustment", vadjustment,
 408                                     NULL);
 409
 410   return scrolled_window;
 411 }
 412
 413 /**
 414  * gtk_scrolled_window_set_hadjustment:
 415  * @scrolled_window: a #GtkScrolledWindow
 416  * @hadjustment: horizontal scroll adjustment
 417  *
 418  * Sets the #GtkAdjustment for the horizontal scrollbar.
 419  */
 420 void
 421 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 422                                      GtkAdjustment     *hadjustment)
 423 {
 424   GtkBin *bin;
 425
 426   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 427   if (hadjustment)
 428     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 429   else
 430     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 431
 432   bin = GTK_BIN (scrolled_window);
 433
 434   if (!scrolled_window->hscrollbar)
 435     {
 436       gtk_widget_push_composite_child ();
 437       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 438       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 439       gtk_widget_pop_composite_child ();
 440
 441       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 442       g_object_ref (scrolled_window->hscrollbar);
 443       gtk_widget_show (scrolled_window->hscrollbar);
 444     }
 445   else
 446     {
 447       GtkAdjustment *old_adjustment;
 448
 449       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 450       if (old_adjustment == hadjustment)
 451         return;
 452
 453       g_signal_handlers_disconnect_by_func (old_adjustment,
 454                                             gtk_scrolled_window_adjustment_changed,
 455                                             scrolled_window);
 456       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 457                                 hadjustment);
 458     }
 459   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 460   g_signal_connect (hadjustment,
 461                     "changed",
 462                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 463                     scrolled_window);
 464   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 465
 466   if (bin->child)
 467     gtk_widget_set_scroll_adjustments (bin->child,
 468                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 469                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 470
 471   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 472 }
 473
 474 /**
 475  * gtk_scrolled_window_set_vadjustment:
 476  * @scrolled_window: a #GtkScrolledWindow
 477  * @vadjustment: vertical scroll adjustment
 478  *
 479  * Sets the #GtkAdjustment for the vertical scrollbar.
 480  */
 481 void
 482 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 483                                      GtkAdjustment     *vadjustment)
 484 {
 485   GtkBin *bin;
 486
 487   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 488   if (vadjustment)
 489     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 490   else
 491     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 492
 493   bin = GTK_BIN (scrolled_window);
 494
 495   if (!scrolled_window->vscrollbar)
 496     {
 497       gtk_widget_push_composite_child ();
 498       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 499       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 500       gtk_widget_pop_composite_child ();
 501
 502       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 503       g_object_ref (scrolled_window->vscrollbar);
 504       gtk_widget_show (scrolled_window->vscrollbar);
 505     }
 506   else
 507     {
 508       GtkAdjustment *old_adjustment;
 509
 510       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 511       if (old_adjustment == vadjustment)
 512         return;
 513
 514       g_signal_handlers_disconnect_by_func (old_adjustment,
 515                                             gtk_scrolled_window_adjustment_changed,
 516                                             scrolled_window);
 517       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 518                                 vadjustment);
 519     }
 520   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 521   g_signal_connect (vadjustment,
 522                     "changed",
 523                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 524                     scrolled_window);
 525   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 526
 527   if (bin->child)
 528     gtk_widget_set_scroll_adjustments (bin->child,
 529                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 530                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 531
 532   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 533 }
 534
 535 /**
 536  * gtk_scrolled_window_get_hadjustment:
 537  * @scrolled_window: a #GtkScrolledWindow
 538  *
 539  * Returns the horizontal scrollbar's adjustment, used to connect the
 540  * horizontal scrollbar to the child widget's horizontal scroll
 541  * functionality.
 542  *
 543  * Returns: the horizontal #GtkAdjustment
 544  */
 545 GtkAdjustment*
 546 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 547 {
 548   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 549
 550   return (scrolled_window->hscrollbar ?
 551           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 552           NULL);
 553 }
 554
 555 /**
 556  * gtk_scrolled_window_get_vadjustment:
 557  * @scrolled_window: a #GtkScrolledWindow
 558  *
 559  * Returns the vertical scrollbar's adjustment, used to connect the
 560  * vertical scrollbar to the child widget's vertical scroll
 561  * functionality.
 562  *
 563  * Returns: the vertical #GtkAdjustment
 564  */
 565 GtkAdjustment*
 566 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 567 {
 568   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 569
 570   return (scrolled_window->vscrollbar ?
 571           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 572           NULL);
 573 }
 574
 575 /**
 576  * gtk_scrolled_window_get_hscrollbar:
 577  * @scrolled_window: a #GtkScrolledWindow
 578  *
 579  * Returns the horizontal scrollbar of @scrolled_window.
 580  *
 581  * Returns: the horizontal scrollbar of the scrolled window, or
 582  *  %NULL if it does not have one.
 583  *
 584  * Since: 2.8
 585  */
 586 GtkWidget*
 587 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 588 {
 589   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 590
 591   return scrolled_window->hscrollbar;
 592 }
 593
 594 /**
 595  * gtk_scrolled_window_get_vscrollbar:
 596  * @scrolled_window: a #GtkScrolledWindow
 597  *
 598  * Returns the vertical scrollbar of @scrolled_window.
 599  *
 600  * Returns: the vertical scrollbar of the scrolled window, or
 601  *  %NULL if it does not have one.
 602  *
 603  * Since: 2.8
 604  */
 605 GtkWidget*
 606 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 607 {
 608   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 609
 610   return scrolled_window->vscrollbar;
 611 }
 612
 613 /**
 614  * gtk_scrolled_window_set_policy:
 615  * @scrolled_window: a #GtkScrolledWindow
 616  * @hscrollbar_policy: policy for horizontal bar
 617  * @vscrollbar_policy: policy for vertical bar
 618  *
 619  * Sets the scrollbar policy for the horizontal and vertical scrollbars.
 620  *
 621  * The policy determines when the scrollbar should appear; it is a value
 622  * from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
 623  * scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
 624  * never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
 625  * if needed (that is, if the slider part of the bar would be smaller
 626  * than the trough - the display is larger than the page size).
 627  */
 628 void
 629 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 630                                 GtkPolicyType      hscrollbar_policy,
 631                                 GtkPolicyType      vscrollbar_policy)
 632 {
 633   GObject *object = G_OBJECT (scrolled_window);
 634
 635   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 636
 637   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 638       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 639     {
 640       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 641       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 642
 643       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 644
 645       g_object_freeze_notify (object);
 646       g_object_notify (object, "hscrollbar-policy");
 647       g_object_notify (object, "vscrollbar-policy");
 648       g_object_thaw_notify (object);
 649     }
 650 }
 651
 652 /**
 653  * gtk_scrolled_window_get_policy:
 654  * @scrolled_window: a #GtkScrolledWindow
 655  * @hscrollbar_policy: location to store the policy for the horizontal
 656  *     scrollbar, or %NULL.
 657  * @vscrollbar_policy: location to store the policy for the vertical
 658  *     scrollbar, or %NULL.
 659  *
 660  * Retrieves the current policy values for the horizontal and vertical
 661  * scrollbars. See gtk_scrolled_window_set_policy().
 662  */
 663 void
 664 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 665                                 GtkPolicyType     *hscrollbar_policy,
 666                                 GtkPolicyType     *vscrollbar_policy)
 667 {
 668   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 669
 670   if (hscrollbar_policy)
 671     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 672   if (vscrollbar_policy)
 673     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 674 }
 675
 676 static void
 677 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 678 {
 679   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 680   GtkSettings *settings;
 681
 682   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 683
 684   if (priv->window_placement_set || settings == NULL)
 685     priv->real_window_placement = scrolled_window->window_placement;
 686   else
 687     g_object_get (settings,
 688                   "gtk-scrolled-window-placement",
 689                   &priv->real_window_placement,
 690                   NULL);
 691 }
 692
 693 static void
 694 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 695                                             GtkCornerType      window_placement)
 696 {
 697   if (scrolled_window->window_placement != window_placement)
 698     {
 699       scrolled_window->window_placement = window_placement;
 700
 701       gtk_scrolled_window_update_real_placement (scrolled_window);
 702       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 703
 704       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 705     }
 706 }
 707
 708 static void
 709 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 710                                        gboolean           placement_set,
 711                                        gboolean           emit_resize)
 712 {
 713   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 714
 715   if (priv->window_placement_set != placement_set)
 716     {
 717       priv->window_placement_set = placement_set;
 718
 719       gtk_scrolled_window_update_real_placement (scrolled_window);
 720       if (emit_resize)
 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_placement:
 729  * @scrolled_window: a #GtkScrolledWindow
 730  * @window_placement: position of the child window
 731  *
 732  * Sets the placement of the contents with respect to the scrollbars
 733  * for the scrolled window.
 734  *
 735  * The default is %GTK_CORNER_TOP_LEFT, meaning the child is
 736  * in the top left, with the scrollbars underneath and to the right.
 737  * Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
 738  * %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
 739  *
 740  * See also gtk_scrolled_window_get_placement() and
 741  * gtk_scrolled_window_unset_placement().
 742  */
 743 void
 744 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 745                                    GtkCornerType      window_placement)
 746 {
 747   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 748
 749   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 750   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 751 }
 752
 753 /**
 754  * gtk_scrolled_window_get_placement:
 755  * @scrolled_window: a #GtkScrolledWindow
 756  *
 757  * Gets the placement of the contents with respect to the scrollbars
 758  * for the scrolled window. See gtk_scrolled_window_set_placement().
 759  *
 760  * Return value: the current placement value.
 761  *
 762  * See also gtk_scrolled_window_set_placement() and
 763  * gtk_scrolled_window_unset_placement().
 764  **/
 765 GtkCornerType
 766 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 767 {
 768   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 769
 770   return scrolled_window->window_placement;
 771 }
 772
 773 /**
 774  * gtk_scrolled_window_unset_placement:
 775  * @scrolled_window: a #GtkScrolledWindow
 776  *
 777  * Unsets the placement of the contents with respect to the scrollbars
 778  * for the scrolled window. If no window placement is set for a scrolled
 779  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 780  *
 781  * See also gtk_scrolled_window_set_placement() and
 782  * gtk_scrolled_window_get_placement().
 783  *
 784  * Since: 2.10
 785  **/
 786 void
 787 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 788 {
 789   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 790
 791   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 792
 793   if (priv->window_placement_set)
 794     {
 795       priv->window_placement_set = FALSE;
 796
 797       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 798
 799       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 800     }
 801 }
 802
 803 /**
 804  * gtk_scrolled_window_set_shadow_type:
 805  * @scrolled_window: a #GtkScrolledWindow
 806  * @type: kind of shadow to draw around scrolled window contents
 807  *
 808  * Changes the type of shadow drawn around the contents of
 809  * @scrolled_window.
 810  *
 811  **/
 812 void
 813 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 814                                      GtkShadowType      type)
 815 {
 816   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 817   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 818
 819   if (scrolled_window->shadow_type != type)
 820     {
 821       scrolled_window->shadow_type = type;
 822
 823       if (gtk_widget_is_drawable (GTK_WIDGET (scrolled_window)))
 824         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 825
 826       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 827
 828       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 829     }
 830 }
 831
 832 /**
 833  * gtk_scrolled_window_get_shadow_type:
 834  * @scrolled_window: a #GtkScrolledWindow
 835  *
 836  * Gets the shadow type of the scrolled window. See
 837  * gtk_scrolled_window_set_shadow_type().
 838  *
 839  * Return value: the current shadow type
 840  **/
 841 GtkShadowType
 842 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 843 {
 844   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 845
 846   return scrolled_window->shadow_type;
 847 }
 848
 849 static void
 850 gtk_scrolled_window_destroy (GtkObject *object)
 851 {
 852   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 853
 854   if (scrolled_window->hscrollbar)
 855     {
 856       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 857                                             gtk_scrolled_window_adjustment_changed,
 858                                             scrolled_window);
 859       gtk_widget_unparent (scrolled_window->hscrollbar);
 860       gtk_widget_destroy (scrolled_window->hscrollbar);
 861       g_object_unref (scrolled_window->hscrollbar);
 862       scrolled_window->hscrollbar = NULL;
 863     }
 864   if (scrolled_window->vscrollbar)
 865     {
 866       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)),
 867                                             gtk_scrolled_window_adjustment_changed,
 868                                             scrolled_window);
 869       gtk_widget_unparent (scrolled_window->vscrollbar);
 870       gtk_widget_destroy (scrolled_window->vscrollbar);
 871       g_object_unref (scrolled_window->vscrollbar);
 872       scrolled_window->vscrollbar = NULL;
 873     }
 874
 875   GTK_OBJECT_CLASS (gtk_scrolled_window_parent_class)->destroy (object);
 876 }
 877
 878 static void
 879 gtk_scrolled_window_set_property (GObject      *object,
 880                                   guint         prop_id,
 881                                   const GValue *value,
 882                                   GParamSpec   *pspec)
 883 {
 884   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 885
 886   switch (prop_id)
 887     {
 888     case PROP_HADJUSTMENT:
 889       gtk_scrolled_window_set_hadjustment (scrolled_window,
 890                                            g_value_get_object (value));
 891       break;
 892     case PROP_VADJUSTMENT:
 893       gtk_scrolled_window_set_vadjustment (scrolled_window,
 894                                            g_value_get_object (value));
 895       break;
 896     case PROP_HSCROLLBAR_POLICY:
 897       gtk_scrolled_window_set_policy (scrolled_window,
 898                                       g_value_get_enum (value),
 899                                       scrolled_window->vscrollbar_policy);
 900       break;
 901     case PROP_VSCROLLBAR_POLICY:
 902       gtk_scrolled_window_set_policy (scrolled_window,
 903                                       scrolled_window->hscrollbar_policy,
 904                                       g_value_get_enum (value));
 905       break;
 906     case PROP_WINDOW_PLACEMENT:
 907       gtk_scrolled_window_set_placement_internal (scrolled_window,
 908                                                   g_value_get_enum (value));
 909       break;
 910     case PROP_WINDOW_PLACEMENT_SET:
 911       gtk_scrolled_window_set_placement_set (scrolled_window,
 912                                              g_value_get_boolean (value),
 913                                              TRUE);
 914       break;
 915     case PROP_SHADOW_TYPE:
 916       gtk_scrolled_window_set_shadow_type (scrolled_window,
 917                                            g_value_get_enum (value));
 918       break;
 919     default:
 920       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 921       break;
 922     }
 923 }
 924
 925 static void
 926 gtk_scrolled_window_get_property (GObject    *object,
 927                                   guint       prop_id,
 928                                   GValue     *value,
 929                                   GParamSpec *pspec)
 930 {
 931   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 932   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 933
 934   switch (prop_id)
 935     {
 936     case PROP_HADJUSTMENT:
 937       g_value_set_object (value,
 938                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 939       break;
 940     case PROP_VADJUSTMENT:
 941       g_value_set_object (value,
 942                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 943       break;
 944     case PROP_HSCROLLBAR_POLICY:
 945       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 946       break;
 947     case PROP_VSCROLLBAR_POLICY:
 948       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 949       break;
 950     case PROP_WINDOW_PLACEMENT:
 951       g_value_set_enum (value, scrolled_window->window_placement);
 952       break;
 953     case PROP_WINDOW_PLACEMENT_SET:
 954       g_value_set_boolean (value, priv->window_placement_set);
 955       break;
 956     case PROP_SHADOW_TYPE:
 957       g_value_set_enum (value, scrolled_window->shadow_type);
 958       break;
 959     default:
 960       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 961       break;
 962     }
 963 }
 964
 965 static void
 966 traverse_container (GtkWidget *widget,
 967                     gpointer   data)
 968 {
 969   if (GTK_IS_SCROLLED_WINDOW (widget))
 970     {
 971       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 972       gtk_widget_queue_resize (widget);
 973     }
 974   else if (GTK_IS_CONTAINER (widget))
 975     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
 976 }
 977
 978 static void
 979 gtk_scrolled_window_settings_changed (GtkSettings *settings)
 980 {
 981   GList *list, *l;
 982
 983   list = gtk_window_list_toplevels ();
 984
 985   for (l = list; l; l = l->next)
 986     gtk_container_forall (GTK_CONTAINER (l->data),
 987                           traverse_container, NULL);
 988
 989   g_list_free (list);
 990 }
 991
 992 static void
 993 gtk_scrolled_window_screen_changed (GtkWidget *widget,
 994                                     GdkScreen *previous_screen)
 995 {
 996   GtkSettings *settings;
 997   guint window_placement_connection;
 998
 999   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1000
1001   if (!gtk_widget_has_screen (widget))
1002     return;
1003
1004   settings = gtk_widget_get_settings (widget);
1005
1006   window_placement_connection =
1007     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
1008                                          "gtk-scrolled-window-connection"));
1009
1010   if (window_placement_connection)
1011     return;
1012
1013   window_placement_connection =
1014     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
1015                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
1016   g_object_set_data (G_OBJECT (settings),
1017                      I_("gtk-scrolled-window-connection"),
1018                      GUINT_TO_POINTER (window_placement_connection));
1019 }
1020
1021 static void
1022 gtk_scrolled_window_paint (GtkWidget    *widget,
1023                            GdkRectangle *area)
1024 {
1025   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1026
1027   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1028     {
1029       GtkAllocation relative_allocation;
1030       gboolean scrollbars_within_bevel;
1031
1032       gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1033
1034       if (!scrollbars_within_bevel)
1035         {
1036           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1037
1038           relative_allocation.x -= widget->style->xthickness;
1039           relative_allocation.y -= widget->style->ythickness;
1040           relative_allocation.width += 2 * widget->style->xthickness;
1041           relative_allocation.height += 2 * widget->style->ythickness;
1042         }
1043       else
1044         {
1045           GtkContainer *container = GTK_CONTAINER (widget);
1046
1047           relative_allocation.x = container->border_width;
1048           relative_allocation.y = container->border_width;
1049           relative_allocation.width = widget->allocation.width - 2 * container->border_width;
1050           relative_allocation.height = widget->allocation.height - 2 * container->border_width;
1051         }
1052
1053       gtk_paint_shadow (widget->style, widget->window,
1054                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
1055                         area, widget, "scrolled_window",
1056                         widget->allocation.x + relative_allocation.x,
1057                         widget->allocation.y + relative_allocation.y,
1058                         relative_allocation.width,
1059                         relative_allocation.height);
1060     }
1061 }
1062
1063 static gboolean
1064 gtk_scrolled_window_expose (GtkWidget      *widget,
1065                             GdkEventExpose *event)
1066 {
1067   if (gtk_widget_is_drawable (widget))
1068     {
1069       gtk_scrolled_window_paint (widget, &event->area);
1070
1071       GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->expose_event (widget, event);
1072     }
1073
1074   return FALSE;
1075 }
1076
1077 static void
1078 gtk_scrolled_window_forall (GtkContainer *container,
1079                             gboolean      include_internals,
1080                             GtkCallback   callback,
1081                             gpointer      callback_data)
1082 {
1083   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1084   g_return_if_fail (callback != NULL);
1085
1086   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
1087                                               include_internals,
1088                                               callback,
1089                                               callback_data);
1090   if (include_internals)
1091     {
1092       GtkScrolledWindow *scrolled_window;
1093
1094       scrolled_window = GTK_SCROLLED_WINDOW (container);
1095
1096       if (scrolled_window->vscrollbar)
1097         callback (scrolled_window->vscrollbar, callback_data);
1098       if (scrolled_window->hscrollbar)
1099         callback (scrolled_window->hscrollbar, callback_data);
1100     }
1101 }
1102
1103 static gboolean
1104 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1105                                   GtkScrollType      scroll,
1106                                   gboolean           horizontal)
1107 {
1108   GtkAdjustment *adjustment = NULL;
1109
1110   switch (scroll)
1111     {
1112     case GTK_SCROLL_STEP_UP:
1113       scroll = GTK_SCROLL_STEP_BACKWARD;
1114       horizontal = FALSE;
1115       break;
1116     case GTK_SCROLL_STEP_DOWN:
1117       scroll = GTK_SCROLL_STEP_FORWARD;
1118       horizontal = FALSE;
1119       break;
1120     case GTK_SCROLL_STEP_LEFT:
1121       scroll = GTK_SCROLL_STEP_BACKWARD;
1122       horizontal = TRUE;
1123       break;
1124     case GTK_SCROLL_STEP_RIGHT:
1125       scroll = GTK_SCROLL_STEP_FORWARD;
1126       horizontal = TRUE;
1127       break;
1128     case GTK_SCROLL_PAGE_UP:
1129       scroll = GTK_SCROLL_PAGE_BACKWARD;
1130       horizontal = FALSE;
1131       break;
1132     case GTK_SCROLL_PAGE_DOWN:
1133       scroll = GTK_SCROLL_PAGE_FORWARD;
1134       horizontal = FALSE;
1135       break;
1136     case GTK_SCROLL_PAGE_LEFT:
1137       scroll = GTK_SCROLL_STEP_BACKWARD;
1138       horizontal = TRUE;
1139       break;
1140     case GTK_SCROLL_PAGE_RIGHT:
1141       scroll = GTK_SCROLL_STEP_FORWARD;
1142       horizontal = TRUE;
1143       break;
1144     case GTK_SCROLL_STEP_BACKWARD:
1145     case GTK_SCROLL_STEP_FORWARD:
1146     case GTK_SCROLL_PAGE_BACKWARD:
1147     case GTK_SCROLL_PAGE_FORWARD:
1148     case GTK_SCROLL_START:
1149     case GTK_SCROLL_END:
1150       break;
1151     default:
1152       g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
1153       return FALSE;
1154     }
1155
1156   if ((horizontal && (!scrolled_window->hscrollbar || !scrolled_window->hscrollbar_visible)) ||
1157       (!horizontal && (!scrolled_window->vscrollbar || !scrolled_window->vscrollbar_visible)))
1158     return FALSE;
1159
1160   if (horizontal)
1161     {
1162       if (scrolled_window->hscrollbar)
1163         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
1164     }
1165   else
1166     {
1167       if (scrolled_window->vscrollbar)
1168         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
1169     }
1170
1171   if (adjustment)
1172     {
1173       gdouble value = adjustment->value;
1174
1175       switch (scroll)
1176         {
1177         case GTK_SCROLL_STEP_FORWARD:
1178           value += adjustment->step_increment;
1179           break;
1180         case GTK_SCROLL_STEP_BACKWARD:
1181           value -= adjustment->step_increment;
1182           break;
1183         case GTK_SCROLL_PAGE_FORWARD:
1184           value += adjustment->page_increment;
1185           break;
1186         case GTK_SCROLL_PAGE_BACKWARD:
1187           value -= adjustment->page_increment;
1188           break;
1189         case GTK_SCROLL_START:
1190           value = adjustment->lower;
1191           break;
1192         case GTK_SCROLL_END:
1193           value = adjustment->upper;
1194           break;
1195         default:
1196           g_assert_not_reached ();
1197           break;
1198         }
1199
1200       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
1201
1202       gtk_adjustment_set_value (adjustment, value);
1203
1204       return TRUE;
1205     }
1206
1207   return FALSE;
1208 }
1209
1210 static void
1211 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1212                                     GtkDirectionType   direction_type)
1213 {
1214   GtkWidget *toplevel;
1215
1216   /* Focus out of the scrolled window entirely. We do this by setting
1217    * a flag, then propagating the focus motion to the notebook.
1218    */
1219   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1220   if (!gtk_widget_is_toplevel (toplevel))
1221     return;
1222
1223   g_object_ref (scrolled_window);
1224
1225   scrolled_window->focus_out = TRUE;
1226   g_signal_emit_by_name (toplevel, "move-focus", direction_type);
1227   scrolled_window->focus_out = FALSE;
1228
1229   g_object_unref (scrolled_window);
1230 }
1231
1232 static void
1233 gtk_scrolled_window_size_request (GtkWidget      *widget,
1234                                   GtkRequisition *requisition)
1235 {
1236   GtkScrolledWindow *scrolled_window;
1237   GtkBin *bin;
1238   gint extra_width;
1239   gint extra_height;
1240   gint scrollbar_spacing;
1241   GtkRequisition hscrollbar_requisition;
1242   GtkRequisition vscrollbar_requisition;
1243   GtkRequisition child_requisition;
1244
1245   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1246   g_return_if_fail (requisition != NULL);
1247
1248   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1249   bin = GTK_BIN (scrolled_window);
1250
1251   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1252
1253   extra_width = 0;
1254   extra_height = 0;
1255   requisition->width = 0;
1256   requisition->height = 0;
1257
1258   gtk_widget_size_request (scrolled_window->hscrollbar,
1259                            &hscrollbar_requisition);
1260   gtk_widget_size_request (scrolled_window->vscrollbar,
1261                            &vscrollbar_requisition);
1262
1263   if (bin->child && gtk_widget_get_visible (bin->child))
1264     {
1265       gtk_widget_size_request (bin->child, &child_requisition);
1266
1267       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1268         requisition->width += child_requisition.width;
1269       else
1270         {
1271           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1272
1273           if (aux_info && aux_info->width > 0)
1274             {
1275               requisition->width += aux_info->width;
1276               extra_width = -1;
1277             }
1278           else
1279             requisition->width += vscrollbar_requisition.width;
1280         }
1281
1282       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1283         requisition->height += child_requisition.height;
1284       else
1285         {
1286           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1287
1288           if (aux_info && aux_info->height > 0)
1289             {
1290               requisition->height += aux_info->height;
1291               extra_height = -1;
1292             }
1293           else
1294             requisition->height += hscrollbar_requisition.height;
1295         }
1296     }
1297
1298   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1299       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1300     {
1301       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
1302       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1303         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1304     }
1305
1306   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1307       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1308     {
1309       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
1310       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1311         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1312     }
1313
1314   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
1315   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
1316
1317   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1318     {
1319       requisition->width += 2 * widget->style->xthickness;
1320       requisition->height += 2 * widget->style->ythickness;
1321     }
1322 }
1323
1324 static void
1325 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1326                                          GtkAllocation *allocation)
1327 {
1328   GtkScrolledWindow *scrolled_window;
1329   GtkScrolledWindowPrivate *priv;
1330   gint scrollbar_spacing;
1331
1332   g_return_if_fail (widget != NULL);
1333   g_return_if_fail (allocation != NULL);
1334
1335   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1336   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1337
1338   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1339
1340   allocation->x = GTK_CONTAINER (widget)->border_width;
1341   allocation->y = GTK_CONTAINER (widget)->border_width;
1342
1343   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1344     {
1345       allocation->x += widget->style->xthickness;
1346       allocation->y += widget->style->ythickness;
1347     }
1348
1349   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1350   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1351
1352   if (scrolled_window->vscrollbar_visible)
1353     {
1354       GtkRequisition vscrollbar_requisition;
1355       gboolean is_rtl;
1356
1357       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1358                                         &vscrollbar_requisition);
1359       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1360
1361       if ((!is_rtl &&
1362            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1363             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1364           (is_rtl &&
1365            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1366             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1367         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1368
1369       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1370     }
1371   if (scrolled_window->hscrollbar_visible)
1372     {
1373       GtkRequisition hscrollbar_requisition;
1374       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1375                                         &hscrollbar_requisition);
1376
1377       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1378           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1379         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1380
1381       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1382     }
1383 }
1384
1385 static void
1386 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1387                                    GtkAllocation *allocation)
1388 {
1389   GtkScrolledWindow *scrolled_window;
1390   GtkScrolledWindowPrivate *priv;
1391   GtkBin *bin;
1392   GtkAllocation relative_allocation;
1393   GtkAllocation child_allocation;
1394   gboolean scrollbars_within_bevel;
1395   gint scrollbar_spacing;
1396
1397   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1398   g_return_if_fail (allocation != NULL);
1399
1400   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1401   bin = GTK_BIN (scrolled_window);
1402
1403   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1404   gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1405
1406   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1407
1408   widget->allocation = *allocation;
1409
1410   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1411     scrolled_window->hscrollbar_visible = TRUE;
1412   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1413     scrolled_window->hscrollbar_visible = FALSE;
1414   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1415     scrolled_window->vscrollbar_visible = TRUE;
1416   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1417     scrolled_window->vscrollbar_visible = FALSE;
1418
1419   if (bin->child && gtk_widget_get_visible (bin->child))
1420     {
1421       gboolean previous_hvis;
1422       gboolean previous_vvis;
1423       guint count = 0;
1424
1425       do
1426         {
1427           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1428
1429           child_allocation.x = relative_allocation.x + allocation->x;
1430           child_allocation.y = relative_allocation.y + allocation->y;
1431           child_allocation.width = relative_allocation.width;
1432           child_allocation.height = relative_allocation.height;
1433
1434           previous_hvis = scrolled_window->hscrollbar_visible;
1435           previous_vvis = scrolled_window->vscrollbar_visible;
1436
1437           gtk_widget_size_allocate (bin->child, &child_allocation);
1438
1439           /* If, after the first iteration, the hscrollbar and the
1440            * vscrollbar flip visiblity, then we need both.
1441            */
1442           if (count &&
1443               previous_hvis != scrolled_window->hscrollbar_visible &&
1444               previous_vvis != scrolled_window->vscrollbar_visible)
1445             {
1446               scrolled_window->hscrollbar_visible = TRUE;
1447               scrolled_window->vscrollbar_visible = TRUE;
1448
1449               /* a new resize is already queued at this point,
1450                * so we will immediatedly get reinvoked
1451                */
1452               return;
1453             }
1454
1455           count++;
1456         }
1457       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1458              previous_vvis != scrolled_window->vscrollbar_visible);
1459     }
1460   else
1461     {
1462       scrolled_window->hscrollbar_visible = scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS;
1463       scrolled_window->vscrollbar_visible = scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS;
1464       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1465     }
1466
1467   if (scrolled_window->hscrollbar_visible)
1468     {
1469       GtkRequisition hscrollbar_requisition;
1470       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1471                                         &hscrollbar_requisition);
1472
1473       if (!gtk_widget_get_visible (scrolled_window->hscrollbar))
1474         gtk_widget_show (scrolled_window->hscrollbar);
1475
1476       child_allocation.x = relative_allocation.x;
1477       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1478           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1479         child_allocation.y = (relative_allocation.y +
1480                               relative_allocation.height +
1481                               scrollbar_spacing +
1482                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1483                                0 : widget->style->ythickness));
1484       else
1485         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1486
1487       child_allocation.width = relative_allocation.width;
1488       child_allocation.height = hscrollbar_requisition.height;
1489       child_allocation.x += allocation->x;
1490       child_allocation.y += allocation->y;
1491
1492       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1493         {
1494           if (!scrollbars_within_bevel)
1495             {
1496               child_allocation.x -= widget->style->xthickness;
1497               child_allocation.width += 2 * widget->style->xthickness;
1498             }
1499           else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
1500                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1501             {
1502               child_allocation.y -= widget->style->ythickness;
1503             }
1504           else
1505             {
1506               child_allocation.y += widget->style->ythickness;
1507             }
1508         }
1509
1510       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1511     }
1512   else if (gtk_widget_get_visible (scrolled_window->hscrollbar))
1513     gtk_widget_hide (scrolled_window->hscrollbar);
1514
1515   if (scrolled_window->vscrollbar_visible)
1516     {
1517       GtkRequisition vscrollbar_requisition;
1518       if (!gtk_widget_get_visible (scrolled_window->vscrollbar))
1519         gtk_widget_show (scrolled_window->vscrollbar);
1520
1521       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1522                                         &vscrollbar_requisition);
1523
1524       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1525            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1526             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1527           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1528            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1529             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1530         child_allocation.x = (relative_allocation.x +
1531                               relative_allocation.width +
1532                               scrollbar_spacing +
1533                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1534                                0 : widget->style->xthickness));
1535       else
1536         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1537
1538       child_allocation.y = relative_allocation.y;
1539       child_allocation.width = vscrollbar_requisition.width;
1540       child_allocation.height = relative_allocation.height;
1541       child_allocation.x += allocation->x;
1542       child_allocation.y += allocation->y;
1543
1544       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1545         {
1546           if (!scrollbars_within_bevel)
1547             {
1548               child_allocation.y -= widget->style->ythickness;
1549               child_allocation.height += 2 * widget->style->ythickness;
1550             }
1551           else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
1552                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1553             {
1554               child_allocation.x -= widget->style->xthickness;
1555             }
1556           else
1557             {
1558               child_allocation.x += widget->style->xthickness;
1559             }
1560         }
1561
1562       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1563     }
1564   else if (gtk_widget_get_visible (scrolled_window->vscrollbar))
1565     gtk_widget_hide (scrolled_window->vscrollbar);
1566 }
1567
1568 static gboolean
1569 gtk_scrolled_window_scroll_event (GtkWidget      *widget,
1570                                   GdkEventScroll *event)
1571 {
1572   GtkWidget *range;
1573
1574   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1575   g_return_val_if_fail (event != NULL, FALSE);
1576
1577   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1578     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1579   else
1580     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1581
1582   if (range && gtk_widget_get_visible (range))
1583     {
1584       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1585       gdouble delta, new_value;
1586
1587       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1588
1589       new_value = CLAMP (adj->value + delta, adj->lower, adj->upper - adj->page_size);
1590
1591       gtk_adjustment_set_value (adj, new_value);
1592
1593       return TRUE;
1594     }
1595
1596   return FALSE;
1597 }
1598
1599 static gboolean
1600 gtk_scrolled_window_focus (GtkWidget        *widget,
1601                            GtkDirectionType  direction)
1602 {
1603   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1604   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1605
1606   if (scrolled_window->focus_out)
1607     {
1608       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1609       return FALSE;
1610     }
1611
1612   if (gtk_widget_is_focus (widget))
1613     return FALSE;
1614
1615   /* We only put the scrolled window itself in the focus chain if it
1616    * isn't possible to focus any children.
1617    */
1618   if (GTK_BIN (widget)->child)
1619     {
1620       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1621         return TRUE;
1622     }
1623
1624   if (!had_focus_child && gtk_widget_get_can_focus (widget))
1625     {
1626       gtk_widget_grab_focus (widget);
1627       return TRUE;
1628     }
1629   else
1630     return FALSE;
1631 }
1632
1633 static void
1634 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1635                                         gpointer       data)
1636 {
1637   GtkScrolledWindow *scrolled_win;
1638
1639   g_return_if_fail (adjustment != NULL);
1640   g_return_if_fail (data != NULL);
1641
1642   scrolled_win = GTK_SCROLLED_WINDOW (data);
1643
1644   if (scrolled_win->hscrollbar &&
1645       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1646     {
1647       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1648         {
1649           gboolean visible;
1650
1651           visible = scrolled_win->hscrollbar_visible;
1652           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1653                                               adjustment->page_size);
1654           if (scrolled_win->hscrollbar_visible != visible)
1655             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1656         }
1657     }
1658   else if (scrolled_win->vscrollbar &&
1659            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1660     {
1661       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1662         {
1663           gboolean visible;
1664
1665           visible = scrolled_win->vscrollbar_visible;
1666           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1667                                               adjustment->page_size);
1668           if (scrolled_win->vscrollbar_visible != visible)
1669             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1670         }
1671     }
1672 }
1673
1674 static void
1675 gtk_scrolled_window_add (GtkContainer *container,
1676                          GtkWidget    *child)
1677 {
1678   GtkScrolledWindow *scrolled_window;
1679   GtkBin *bin;
1680
1681   bin = GTK_BIN (container);
1682   g_return_if_fail (bin->child == NULL);
1683
1684   scrolled_window = GTK_SCROLLED_WINDOW (container);
1685
1686   bin->child = child;
1687   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1688
1689   /* this is a temporary message */
1690   if (!gtk_widget_set_scroll_adjustments (child,
1691                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1692                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1693     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1694                "use gtk_scrolled_window_add_with_viewport() instead");
1695 }
1696
1697 static void
1698 gtk_scrolled_window_remove (GtkContainer *container,
1699                             GtkWidget    *child)
1700 {
1701   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1702   g_return_if_fail (child != NULL);
1703   g_return_if_fail (GTK_BIN (container)->child == child);
1704
1705   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1706
1707   /* chain parent class handler to remove child */
1708   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1709 }
1710
1711 /**
1712  * gtk_scrolled_window_add_with_viewport:
1713  * @scrolled_window: a #GtkScrolledWindow
1714  * @child: the widget you want to scroll
1715  *
1716  * Used to add children without native scrolling capabilities. This
1717  * is simply a convenience function; it is equivalent to adding the
1718  * unscrollable child to a viewport, then adding the viewport to the
1719  * scrolled window. If a child has native scrolling, use
1720  * gtk_container_add() instead of this function.
1721  *
1722  * The viewport scrolls the child by moving its #GdkWindow, and takes
1723  * the size of the child to be the size of its toplevel #GdkWindow.
1724  * This will be very wrong for most widgets that support native scrolling;
1725  * for example, if you add a widget such as #GtkTreeView with a viewport,
1726  * the whole widget will scroll, including the column headings. Thus,
1727  * widgets with native scrolling support should not be used with the
1728  * #GtkViewport proxy.
1729  *
1730  * A widget supports scrolling natively if the
1731  * set_scroll_adjustments_signal field in #GtkWidgetClass is non-zero,
1732  * i.e. has been filled in with a valid signal identifier.
1733  */
1734 void
1735 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1736                                        GtkWidget         *child)
1737 {
1738   GtkBin *bin;
1739   GtkWidget *viewport;
1740
1741   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1742   g_return_if_fail (GTK_IS_WIDGET (child));
1743   g_return_if_fail (child->parent == NULL);
1744
1745   bin = GTK_BIN (scrolled_window);
1746
1747   if (bin->child != NULL)
1748     {
1749       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1750       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1751
1752       viewport = bin->child;
1753     }
1754   else
1755     {
1756       viewport =
1757         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1758                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1759       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1760     }
1761
1762   gtk_widget_show (viewport);
1763   gtk_container_add (GTK_CONTAINER (viewport), child);
1764 }
1765
1766 /*
1767  * _gtk_scrolled_window_get_spacing:
1768  * @scrolled_window: a scrolled window
1769  *
1770  * Gets the spacing between the scrolled window's scrollbars and
1771  * the scrolled widget. Used by GtkCombo
1772  *
1773  * Return value: the spacing, in pixels.
1774  */
1775 gint
1776 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1777 {
1778   GtkScrolledWindowClass *class;
1779
1780   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1781
1782   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1783
1784   if (class->scrollbar_spacing >= 0)
1785     return class->scrollbar_spacing;
1786   else
1787     {
1788       gint scrollbar_spacing;
1789
1790       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1791                             "scrollbar-spacing", &scrollbar_spacing,
1792                             NULL);
1793
1794       return scrollbar_spacing;
1795     }
1796 }
1797
1798 #define __GTK_SCROLLED_WINDOW_C__
1799 #include "gtkaliasdef.c"