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 "gtkextendedlayout.h"
  32 #include "gtkmarshalers.h"
  33 #include "gtkscrolledwindow.h"
  34 #include "gtkwindow.h"
  35 #include "gtkprivate.h"
  36 #include "gtkintl.h"
  37 #include "gtkalias.h"
  38
  39
  40 /* scrolled window policy and size requisition handling:
  41  *
  42  * gtk size requisition works as follows:
  43  *   a widget upon size-request reports the width and height that it finds
  44  *   to be best suited to display its contents, including children.
  45  *   the width and/or height reported from a widget upon size requisition
  46  *   may be overidden by the user by specifying a width and/or height
  47  *   other than 0 through gtk_widget_set_size_request().
  48  *
  49  * a scrolled window needs (for implementing all three policy types) to
  50  * request its width and height based on two different rationales.
  51  * 1)   the user wants the scrolled window to just fit into the space
  52  *      that it gets allocated for a specifc dimension.
  53  * 1.1) this does not apply if the user specified a concrete value
  54  *      value for that specific dimension by either specifying usize for the
  55  *      scrolled window or for its child.
  56  * 2)   the user wants the scrolled window to take as much space up as
  57  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
  58  *
  59  * also, kinda obvious:
  60  * 3)   a user would certainly not have choosen a scrolled window as a container
  61  *      for the child, if the resulting allocation takes up more space than the
  62  *      child would have allocated without the scrolled window.
  63  *
  64  * conclusions:
  65  * A) from 1) follows: the scrolled window shouldn't request more space for a
  66  *    specifc dimension than is required at minimum.
  67  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
  68  *    window (done automatically) or by usize of the child (needs to be checked).
  69  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
  70  *    child's dimension.
  71  * D) from 3) follows: the scrolled window child's minimum width and minimum height
  72  *    under A) at least correspond to the space taken up by its scrollbars.
  73  */
  74
  75 #define DEFAULT_SCROLLBAR_SPACING  3
  76
  77 typedef struct {
  78         gboolean window_placement_set;
  79         GtkCornerType real_window_placement;
  80 } GtkScrolledWindowPrivate;
  81
  82 #define GTK_SCROLLED_WINDOW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_SCROLLED_WINDOW, GtkScrolledWindowPrivate))
  83
  84 enum {
  85   PROP_0,
  86   PROP_HADJUSTMENT,
  87   PROP_VADJUSTMENT,
  88   PROP_HSCROLLBAR_POLICY,
  89   PROP_VSCROLLBAR_POLICY,
  90   PROP_WINDOW_PLACEMENT,
  91   PROP_WINDOW_PLACEMENT_SET,
  92   PROP_SHADOW_TYPE
  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_set_property       (GObject           *object,
 105                                                         guint              prop_id,
 106                                                         const GValue      *value,
 107                                                         GParamSpec        *pspec);
 108 static void     gtk_scrolled_window_get_property       (GObject           *object,
 109                                                         guint              prop_id,
 110                                                         GValue            *value,
 111                                                         GParamSpec        *pspec);
 112
 113 static void     gtk_scrolled_window_screen_changed     (GtkWidget         *widget,
 114                                                         GdkScreen         *previous_screen);
 115 static gboolean gtk_scrolled_window_expose             (GtkWidget         *widget,
 116                                                         GdkEventExpose    *event);
 117 static void     gtk_scrolled_window_size_request       (GtkWidget         *widget,
 118                                                         GtkRequisition    *requisition);
 119 static void     gtk_scrolled_window_size_allocate      (GtkWidget         *widget,
 120                                                         GtkAllocation     *allocation);
 121 static gboolean gtk_scrolled_window_scroll_event       (GtkWidget         *widget,
 122                                                         GdkEventScroll    *event);
 123 static gboolean gtk_scrolled_window_focus              (GtkWidget         *widget,
 124                                                         GtkDirectionType   direction);
 125 static void     gtk_scrolled_window_add                (GtkContainer      *container,
 126                                                         GtkWidget         *widget);
 127 static void     gtk_scrolled_window_remove             (GtkContainer      *container,
 128                                                         GtkWidget         *widget);
 129 static void     gtk_scrolled_window_forall             (GtkContainer      *container,
 130                                                         gboolean           include_internals,
 131                                                         GtkCallback        callback,
 132                                                         gpointer           callback_data);
 133 static gboolean gtk_scrolled_window_scroll_child       (GtkScrolledWindow *scrolled_window,
 134                                                         GtkScrollType      scroll,
 135                                                         gboolean           horizontal);
 136 static void     gtk_scrolled_window_move_focus_out     (GtkScrolledWindow *scrolled_window,
 137                                                         GtkDirectionType   direction_type);
 138
 139 static void     gtk_scrolled_window_relative_allocation(GtkWidget         *widget,
 140                                                         GtkAllocation     *allocation);
 141 static void     gtk_scrolled_window_adjustment_changed (GtkAdjustment     *adjustment,
 142                                                         gpointer           data);
 143
 144 static void  gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window);
 145
 146 static void  gtk_scrolled_window_extended_layout_init  (GtkExtendedLayoutIface *iface);
 147
 148 static guint signals[LAST_SIGNAL] = {0};
 149
 150 G_DEFINE_TYPE_WITH_CODE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN,
 151                          G_IMPLEMENT_INTERFACE (GTK_TYPE_EXTENDED_LAYOUT,
 152                                                 gtk_scrolled_window_extended_layout_init))
 153
 154
 155 static void
 156 add_scroll_binding (GtkBindingSet  *binding_set,
 157                     guint           keyval,
 158                     GdkModifierType mask,
 159                     GtkScrollType   scroll,
 160                     gboolean        horizontal)
 161 {
 162   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 163
 164   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 165                                 "scroll-child", 2,
 166                                 GTK_TYPE_SCROLL_TYPE, scroll,
 167                                 G_TYPE_BOOLEAN, horizontal);
 168   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 169                                 "scroll-child", 2,
 170                                 GTK_TYPE_SCROLL_TYPE, scroll,
 171                                 G_TYPE_BOOLEAN, horizontal);
 172 }
 173
 174 static void
 175 add_tab_bindings (GtkBindingSet    *binding_set,
 176                   GdkModifierType   modifiers,
 177                   GtkDirectionType  direction)
 178 {
 179   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 180                                 "move-focus-out", 1,
 181                                 GTK_TYPE_DIRECTION_TYPE, direction);
 182   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 183                                 "move-focus-out", 1,
 184                                 GTK_TYPE_DIRECTION_TYPE, direction);
 185 }
 186
 187 static void
 188 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 189 {
 190   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 191   GtkObjectClass *object_class;
 192   GtkWidgetClass *widget_class;
 193   GtkContainerClass *container_class;
 194   GtkBindingSet *binding_set;
 195
 196   object_class = (GtkObjectClass*) class;
 197   widget_class = (GtkWidgetClass*) class;
 198   container_class = (GtkContainerClass*) class;
 199
 200   gobject_class->set_property = gtk_scrolled_window_set_property;
 201   gobject_class->get_property = gtk_scrolled_window_get_property;
 202
 203   object_class->destroy = gtk_scrolled_window_destroy;
 204
 205   widget_class->screen_changed = gtk_scrolled_window_screen_changed;
 206   widget_class->expose_event = gtk_scrolled_window_expose;
 207   widget_class->size_request = gtk_scrolled_window_size_request;
 208   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 209   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 210   widget_class->focus = gtk_scrolled_window_focus;
 211
 212   container_class->add = gtk_scrolled_window_add;
 213   container_class->remove = gtk_scrolled_window_remove;
 214   container_class->forall = gtk_scrolled_window_forall;
 215
 216   class->scrollbar_spacing = -1;
 217
 218   class->scroll_child = gtk_scrolled_window_scroll_child;
 219   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 220
 221   g_object_class_install_property (gobject_class,
 222                                    PROP_HADJUSTMENT,
 223                                    g_param_spec_object ("hadjustment",
 224                                                         P_("Horizontal Adjustment"),
 225                                                         P_("The GtkAdjustment for the horizontal position"),
 226                                                         GTK_TYPE_ADJUSTMENT,
 227                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 228   g_object_class_install_property (gobject_class,
 229                                    PROP_VADJUSTMENT,
 230                                    g_param_spec_object ("vadjustment",
 231                                                         P_("Vertical Adjustment"),
 232                                                         P_("The GtkAdjustment for the vertical position"),
 233                                                         GTK_TYPE_ADJUSTMENT,
 234                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 235   g_object_class_install_property (gobject_class,
 236                                    PROP_HSCROLLBAR_POLICY,
 237                                    g_param_spec_enum ("hscrollbar-policy",
 238                                                       P_("Horizontal Scrollbar Policy"),
 239                                                       P_("When the horizontal scrollbar is displayed"),
 240                                                       GTK_TYPE_POLICY_TYPE,
 241                                                       GTK_POLICY_ALWAYS,
 242                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 243   g_object_class_install_property (gobject_class,
 244                                    PROP_VSCROLLBAR_POLICY,
 245                                    g_param_spec_enum ("vscrollbar-policy",
 246                                                       P_("Vertical Scrollbar Policy"),
 247                                                       P_("When the vertical scrollbar is displayed"),
 248                                                       GTK_TYPE_POLICY_TYPE,
 249                                                       GTK_POLICY_ALWAYS,
 250                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 251
 252   g_object_class_install_property (gobject_class,
 253                                    PROP_WINDOW_PLACEMENT,
 254                                    g_param_spec_enum ("window-placement",
 255                                                       P_("Window Placement"),
 256                                                       P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
 257                                                       GTK_TYPE_CORNER_TYPE,
 258                                                       GTK_CORNER_TOP_LEFT,
 259                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 260
 261   /**
 262    * GtkScrolledWindow:window-placement-set:
 263    *
 264    * Whether "window-placement" should be used to determine the location
 265    * of the contents with respect to the scrollbars. Otherwise, the
 266    * "gtk-scrolled-window-placement" setting is used.
 267    *
 268    * Since: 2.10
 269    */
 270   g_object_class_install_property (gobject_class,
 271                                    PROP_WINDOW_PLACEMENT_SET,
 272                                    g_param_spec_boolean ("window-placement-set",
 273                                                          P_("Window Placement Set"),
 274                                                          P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
 275                                                          FALSE,
 276                                                          GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 277   g_object_class_install_property (gobject_class,
 278                                    PROP_SHADOW_TYPE,
 279                                    g_param_spec_enum ("shadow-type",
 280                                                       P_("Shadow Type"),
 281                                                       P_("Style of bevel around the contents"),
 282                                                       GTK_TYPE_SHADOW_TYPE,
 283                                                       GTK_SHADOW_NONE,
 284                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 285
 286   /**
 287    * GtkScrolledWindow:scrollbars-within-bevel:
 288    *
 289    * Whether to place scrollbars within the scrolled window's bevel.
 290    *
 291    * Since: 2.12
 292    */
 293   gtk_widget_class_install_style_property (widget_class,
 294                                            g_param_spec_boolean ("scrollbars-within-bevel",
 295                                                                  P_("Scrollbars within bevel"),
 296                                                                  P_("Place scrollbars within the scrolled window's bevel"),
 297                                                                  FALSE,
 298                                                                  GTK_PARAM_READABLE));
 299
 300   gtk_widget_class_install_style_property (widget_class,
 301                                            g_param_spec_int ("scrollbar-spacing",
 302                                                              P_("Scrollbar spacing"),
 303                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 304                                                              0,
 305                                                              G_MAXINT,
 306                                                              DEFAULT_SCROLLBAR_SPACING,
 307                                                              GTK_PARAM_READABLE));
 308
 309   /**
 310    * GtkSettings:gtk-scrolled-window-placement:
 311    *
 312    * Where the contents of scrolled windows are located with respect to the
 313    * scrollbars, if not overridden by the scrolled window's own placement.
 314    *
 315    * Since: 2.10
 316    */
 317   gtk_settings_install_property (g_param_spec_enum ("gtk-scrolled-window-placement",
 318                                                     P_("Scrolled Window Placement"),
 319                                                     P_("Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement."),
 320                                                     GTK_TYPE_CORNER_TYPE,
 321                                                     GTK_CORNER_TOP_LEFT,
 322                                                     G_PARAM_READABLE | G_PARAM_WRITABLE));
 323
 324
 325   signals[SCROLL_CHILD] =
 326     g_signal_new (I_("scroll-child"),
 327                   G_TYPE_FROM_CLASS (object_class),
 328                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 329                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 330                   NULL, NULL,
 331                   _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
 332                   G_TYPE_BOOLEAN, 2,
 333                   GTK_TYPE_SCROLL_TYPE,
 334                   G_TYPE_BOOLEAN);
 335   signals[MOVE_FOCUS_OUT] =
 336     g_signal_new (I_("move-focus-out"),
 337                   G_TYPE_FROM_CLASS (object_class),
 338                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 339                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 340                   NULL, NULL,
 341                   _gtk_marshal_VOID__ENUM,
 342                   G_TYPE_NONE, 1,
 343                   GTK_TYPE_DIRECTION_TYPE);
 344
 345   binding_set = gtk_binding_set_by_class (class);
 346
 347   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 348   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 349   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 350   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 351
 352   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 353   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 354   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 355   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 356
 357   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 358   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 359   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 360   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 361
 362   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 363   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 364
 365   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 366 }
 367
 368 static void
 369 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 370 {
 371   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 372
 373   scrolled_window->hscrollbar = NULL;
 374   scrolled_window->vscrollbar = NULL;
 375   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 376   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 377   scrolled_window->hscrollbar_visible = FALSE;
 378   scrolled_window->vscrollbar_visible = FALSE;
 379   scrolled_window->focus_out = FALSE;
 380   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 381   gtk_scrolled_window_update_real_placement (scrolled_window);
 382 }
 383
 384 /**
 385  * gtk_scrolled_window_new:
 386  * @hadjustment: (allow-none): horizontal adjustment
 387  * @vadjustment: (allow-none): vertical adjustment
 388  *
 389  * Creates a new scrolled window.
 390  *
 391  * The two arguments are the scrolled window's adjustments; these will be
 392  * shared with the scrollbars and the child widget to keep the bars in sync
 393  * with the child. Usually you want to pass %NULL for the adjustments, which
 394  * will cause the scrolled window to create them for you.
 395  *
 396  * Returns: a new scrolled window
 397  */
 398 GtkWidget*
 399 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 400                          GtkAdjustment *vadjustment)
 401 {
 402   GtkWidget *scrolled_window;
 403
 404   if (hadjustment)
 405     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 406
 407   if (vadjustment)
 408     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 409
 410   scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
 411                                     "hadjustment", hadjustment,
 412                                     "vadjustment", vadjustment,
 413                                     NULL);
 414
 415   return scrolled_window;
 416 }
 417
 418 /**
 419  * gtk_scrolled_window_set_hadjustment:
 420  * @scrolled_window: a #GtkScrolledWindow
 421  * @hadjustment: horizontal scroll adjustment
 422  *
 423  * Sets the #GtkAdjustment for the horizontal scrollbar.
 424  */
 425 void
 426 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 427                                      GtkAdjustment     *hadjustment)
 428 {
 429   GtkBin *bin;
 430
 431   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 432   if (hadjustment)
 433     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 434   else
 435     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 436
 437   bin = GTK_BIN (scrolled_window);
 438
 439   if (!scrolled_window->hscrollbar)
 440     {
 441       gtk_widget_push_composite_child ();
 442       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 443       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 444       gtk_widget_pop_composite_child ();
 445
 446       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 447       g_object_ref (scrolled_window->hscrollbar);
 448       gtk_widget_show (scrolled_window->hscrollbar);
 449     }
 450   else
 451     {
 452       GtkAdjustment *old_adjustment;
 453
 454       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 455       if (old_adjustment == hadjustment)
 456         return;
 457
 458       g_signal_handlers_disconnect_by_func (old_adjustment,
 459                                             gtk_scrolled_window_adjustment_changed,
 460                                             scrolled_window);
 461       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 462                                 hadjustment);
 463     }
 464   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 465   g_signal_connect (hadjustment,
 466                     "changed",
 467                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 468                     scrolled_window);
 469   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 470
 471   if (bin->child)
 472     gtk_widget_set_scroll_adjustments (bin->child,
 473                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 474                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 475
 476   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 477 }
 478
 479 /**
 480  * gtk_scrolled_window_set_vadjustment:
 481  * @scrolled_window: a #GtkScrolledWindow
 482  * @vadjustment: vertical scroll adjustment
 483  *
 484  * Sets the #GtkAdjustment for the vertical scrollbar.
 485  */
 486 void
 487 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 488                                      GtkAdjustment     *vadjustment)
 489 {
 490   GtkBin *bin;
 491
 492   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 493   if (vadjustment)
 494     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 495   else
 496     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 497
 498   bin = GTK_BIN (scrolled_window);
 499
 500   if (!scrolled_window->vscrollbar)
 501     {
 502       gtk_widget_push_composite_child ();
 503       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 504       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 505       gtk_widget_pop_composite_child ();
 506
 507       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 508       g_object_ref (scrolled_window->vscrollbar);
 509       gtk_widget_show (scrolled_window->vscrollbar);
 510     }
 511   else
 512     {
 513       GtkAdjustment *old_adjustment;
 514
 515       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 516       if (old_adjustment == vadjustment)
 517         return;
 518
 519       g_signal_handlers_disconnect_by_func (old_adjustment,
 520                                             gtk_scrolled_window_adjustment_changed,
 521                                             scrolled_window);
 522       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 523                                 vadjustment);
 524     }
 525   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 526   g_signal_connect (vadjustment,
 527                     "changed",
 528                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 529                     scrolled_window);
 530   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 531
 532   if (bin->child)
 533     gtk_widget_set_scroll_adjustments (bin->child,
 534                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 535                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 536
 537   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 538 }
 539
 540 /**
 541  * gtk_scrolled_window_get_hadjustment:
 542  * @scrolled_window: a #GtkScrolledWindow
 543  *
 544  * Returns the horizontal scrollbar's adjustment, used to connect the
 545  * horizontal scrollbar to the child widget's horizontal scroll
 546  * functionality.
 547  *
 548  * Returns: the horizontal #GtkAdjustment
 549  */
 550 GtkAdjustment*
 551 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 552 {
 553   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 554
 555   return (scrolled_window->hscrollbar ?
 556           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 557           NULL);
 558 }
 559
 560 /**
 561  * gtk_scrolled_window_get_vadjustment:
 562  * @scrolled_window: a #GtkScrolledWindow
 563  *
 564  * Returns the vertical scrollbar's adjustment, used to connect the
 565  * vertical scrollbar to the child widget's vertical scroll
 566  * functionality.
 567  *
 568  * Returns: the vertical #GtkAdjustment
 569  */
 570 GtkAdjustment*
 571 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 572 {
 573   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 574
 575   return (scrolled_window->vscrollbar ?
 576           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 577           NULL);
 578 }
 579
 580 /**
 581  * gtk_scrolled_window_get_hscrollbar:
 582  * @scrolled_window: a #GtkScrolledWindow
 583  *
 584  * Returns the horizontal scrollbar of @scrolled_window.
 585  *
 586  * Returns: the horizontal scrollbar of the scrolled window, or
 587  *  %NULL if it does not have one.
 588  *
 589  * Since: 2.8
 590  */
 591 GtkWidget*
 592 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 593 {
 594   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 595
 596   return scrolled_window->hscrollbar;
 597 }
 598
 599 /**
 600  * gtk_scrolled_window_get_vscrollbar:
 601  * @scrolled_window: a #GtkScrolledWindow
 602  *
 603  * Returns the vertical scrollbar of @scrolled_window.
 604  *
 605  * Returns: the vertical scrollbar of the scrolled window, or
 606  *  %NULL if it does not have one.
 607  *
 608  * Since: 2.8
 609  */
 610 GtkWidget*
 611 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 612 {
 613   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 614
 615   return scrolled_window->vscrollbar;
 616 }
 617
 618 /**
 619  * gtk_scrolled_window_set_policy:
 620  * @scrolled_window: a #GtkScrolledWindow
 621  * @hscrollbar_policy: policy for horizontal bar
 622  * @vscrollbar_policy: policy for vertical bar
 623  *
 624  * Sets the scrollbar policy for the horizontal and vertical scrollbars.
 625  *
 626  * The policy determines when the scrollbar should appear; it is a value
 627  * from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
 628  * scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
 629  * never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
 630  * if needed (that is, if the slider part of the bar would be smaller
 631  * than the trough - the display is larger than the page size).
 632  */
 633 void
 634 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 635                                 GtkPolicyType      hscrollbar_policy,
 636                                 GtkPolicyType      vscrollbar_policy)
 637 {
 638   GObject *object = G_OBJECT (scrolled_window);
 639
 640   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 641
 642   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 643       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 644     {
 645       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 646       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 647
 648       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 649
 650       g_object_freeze_notify (object);
 651       g_object_notify (object, "hscrollbar-policy");
 652       g_object_notify (object, "vscrollbar-policy");
 653       g_object_thaw_notify (object);
 654     }
 655 }
 656
 657 /**
 658  * gtk_scrolled_window_get_policy:
 659  * @scrolled_window: a #GtkScrolledWindow
 660  * @hscrollbar_policy: location to store the policy for the horizontal
 661  *     scrollbar, or %NULL.
 662  * @vscrollbar_policy: location to store the policy for the vertical
 663  *     scrollbar, or %NULL.
 664  *
 665  * Retrieves the current policy values for the horizontal and vertical
 666  * scrollbars. See gtk_scrolled_window_set_policy().
 667  */
 668 void
 669 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 670                                 GtkPolicyType     *hscrollbar_policy,
 671                                 GtkPolicyType     *vscrollbar_policy)
 672 {
 673   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 674
 675   if (hscrollbar_policy)
 676     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 677   if (vscrollbar_policy)
 678     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 679 }
 680
 681 static void
 682 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 683 {
 684   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 685   GtkSettings *settings;
 686
 687   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 688
 689   if (priv->window_placement_set || settings == NULL)
 690     priv->real_window_placement = scrolled_window->window_placement;
 691   else
 692     g_object_get (settings,
 693                   "gtk-scrolled-window-placement",
 694                   &priv->real_window_placement,
 695                   NULL);
 696 }
 697
 698 static void
 699 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 700                                             GtkCornerType      window_placement)
 701 {
 702   if (scrolled_window->window_placement != window_placement)
 703     {
 704       scrolled_window->window_placement = window_placement;
 705
 706       gtk_scrolled_window_update_real_placement (scrolled_window);
 707       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 708
 709       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 710     }
 711 }
 712
 713 static void
 714 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 715                                        gboolean           placement_set,
 716                                        gboolean           emit_resize)
 717 {
 718   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 719
 720   if (priv->window_placement_set != placement_set)
 721     {
 722       priv->window_placement_set = placement_set;
 723
 724       gtk_scrolled_window_update_real_placement (scrolled_window);
 725       if (emit_resize)
 726         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 727
 728       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 729     }
 730 }
 731
 732 /**
 733  * gtk_scrolled_window_set_placement:
 734  * @scrolled_window: a #GtkScrolledWindow
 735  * @window_placement: position of the child window
 736  *
 737  * Sets the placement of the contents with respect to the scrollbars
 738  * for the scrolled window.
 739  *
 740  * The default is %GTK_CORNER_TOP_LEFT, meaning the child is
 741  * in the top left, with the scrollbars underneath and to the right.
 742  * Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
 743  * %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
 744  *
 745  * See also gtk_scrolled_window_get_placement() and
 746  * gtk_scrolled_window_unset_placement().
 747  */
 748 void
 749 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 750                                    GtkCornerType      window_placement)
 751 {
 752   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 753
 754   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 755   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 756 }
 757
 758 /**
 759  * gtk_scrolled_window_get_placement:
 760  * @scrolled_window: a #GtkScrolledWindow
 761  *
 762  * Gets the placement of the contents with respect to the scrollbars
 763  * for the scrolled window. See gtk_scrolled_window_set_placement().
 764  *
 765  * Return value: the current placement value.
 766  *
 767  * See also gtk_scrolled_window_set_placement() and
 768  * gtk_scrolled_window_unset_placement().
 769  **/
 770 GtkCornerType
 771 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 772 {
 773   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 774
 775   return scrolled_window->window_placement;
 776 }
 777
 778 /**
 779  * gtk_scrolled_window_unset_placement:
 780  * @scrolled_window: a #GtkScrolledWindow
 781  *
 782  * Unsets the placement of the contents with respect to the scrollbars
 783  * for the scrolled window. If no window placement is set for a scrolled
 784  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 785  *
 786  * See also gtk_scrolled_window_set_placement() and
 787  * gtk_scrolled_window_get_placement().
 788  *
 789  * Since: 2.10
 790  **/
 791 void
 792 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 793 {
 794   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 795
 796   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 797
 798   if (priv->window_placement_set)
 799     {
 800       priv->window_placement_set = FALSE;
 801
 802       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 803
 804       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 805     }
 806 }
 807
 808 /**
 809  * gtk_scrolled_window_set_shadow_type:
 810  * @scrolled_window: a #GtkScrolledWindow
 811  * @type: kind of shadow to draw around scrolled window contents
 812  *
 813  * Changes the type of shadow drawn around the contents of
 814  * @scrolled_window.
 815  *
 816  **/
 817 void
 818 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 819                                      GtkShadowType      type)
 820 {
 821   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 822   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 823
 824   if (scrolled_window->shadow_type != type)
 825     {
 826       scrolled_window->shadow_type = type;
 827
 828       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 829         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 830
 831       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 832
 833       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 834     }
 835 }
 836
 837 /**
 838  * gtk_scrolled_window_get_shadow_type:
 839  * @scrolled_window: a #GtkScrolledWindow
 840  *
 841  * Gets the shadow type of the scrolled window. See
 842  * gtk_scrolled_window_set_shadow_type().
 843  *
 844  * Return value: the current shadow type
 845  **/
 846 GtkShadowType
 847 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 848 {
 849   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 850
 851   return scrolled_window->shadow_type;
 852 }
 853
 854 static void
 855 gtk_scrolled_window_destroy (GtkObject *object)
 856 {
 857   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 858
 859   if (scrolled_window->hscrollbar)
 860     {
 861       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 862                                             gtk_scrolled_window_adjustment_changed,
 863                                             scrolled_window);
 864       gtk_widget_unparent (scrolled_window->hscrollbar);
 865       gtk_widget_destroy (scrolled_window->hscrollbar);
 866       g_object_unref (scrolled_window->hscrollbar);
 867       scrolled_window->hscrollbar = NULL;
 868     }
 869   if (scrolled_window->vscrollbar)
 870     {
 871       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)),
 872                                             gtk_scrolled_window_adjustment_changed,
 873                                             scrolled_window);
 874       gtk_widget_unparent (scrolled_window->vscrollbar);
 875       gtk_widget_destroy (scrolled_window->vscrollbar);
 876       g_object_unref (scrolled_window->vscrollbar);
 877       scrolled_window->vscrollbar = NULL;
 878     }
 879
 880   GTK_OBJECT_CLASS (gtk_scrolled_window_parent_class)->destroy (object);
 881 }
 882
 883 static void
 884 gtk_scrolled_window_set_property (GObject      *object,
 885                                   guint         prop_id,
 886                                   const GValue *value,
 887                                   GParamSpec   *pspec)
 888 {
 889   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 890
 891   switch (prop_id)
 892     {
 893     case PROP_HADJUSTMENT:
 894       gtk_scrolled_window_set_hadjustment (scrolled_window,
 895                                            g_value_get_object (value));
 896       break;
 897     case PROP_VADJUSTMENT:
 898       gtk_scrolled_window_set_vadjustment (scrolled_window,
 899                                            g_value_get_object (value));
 900       break;
 901     case PROP_HSCROLLBAR_POLICY:
 902       gtk_scrolled_window_set_policy (scrolled_window,
 903                                       g_value_get_enum (value),
 904                                       scrolled_window->vscrollbar_policy);
 905       break;
 906     case PROP_VSCROLLBAR_POLICY:
 907       gtk_scrolled_window_set_policy (scrolled_window,
 908                                       scrolled_window->hscrollbar_policy,
 909                                       g_value_get_enum (value));
 910       break;
 911     case PROP_WINDOW_PLACEMENT:
 912       gtk_scrolled_window_set_placement_internal (scrolled_window,
 913                                                   g_value_get_enum (value));
 914       break;
 915     case PROP_WINDOW_PLACEMENT_SET:
 916       gtk_scrolled_window_set_placement_set (scrolled_window,
 917                                              g_value_get_boolean (value),
 918                                              TRUE);
 919       break;
 920     case PROP_SHADOW_TYPE:
 921       gtk_scrolled_window_set_shadow_type (scrolled_window,
 922                                            g_value_get_enum (value));
 923       break;
 924     default:
 925       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 926       break;
 927     }
 928 }
 929
 930 static void
 931 gtk_scrolled_window_get_property (GObject    *object,
 932                                   guint       prop_id,
 933                                   GValue     *value,
 934                                   GParamSpec *pspec)
 935 {
 936   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 937   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 938
 939   switch (prop_id)
 940     {
 941     case PROP_HADJUSTMENT:
 942       g_value_set_object (value,
 943                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 944       break;
 945     case PROP_VADJUSTMENT:
 946       g_value_set_object (value,
 947                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 948       break;
 949     case PROP_HSCROLLBAR_POLICY:
 950       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 951       break;
 952     case PROP_VSCROLLBAR_POLICY:
 953       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 954       break;
 955     case PROP_WINDOW_PLACEMENT:
 956       g_value_set_enum (value, scrolled_window->window_placement);
 957       break;
 958     case PROP_WINDOW_PLACEMENT_SET:
 959       g_value_set_boolean (value, priv->window_placement_set);
 960       break;
 961     case PROP_SHADOW_TYPE:
 962       g_value_set_enum (value, scrolled_window->shadow_type);
 963       break;
 964     default:
 965       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 966       break;
 967     }
 968 }
 969
 970 static void
 971 traverse_container (GtkWidget *widget,
 972                     gpointer   data)
 973 {
 974   if (GTK_IS_SCROLLED_WINDOW (widget))
 975     {
 976       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 977       gtk_widget_queue_resize (widget);
 978     }
 979   else if (GTK_IS_CONTAINER (widget))
 980     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
 981 }
 982
 983 static void
 984 gtk_scrolled_window_settings_changed (GtkSettings *settings)
 985 {
 986   GList *list, *l;
 987
 988   list = gtk_window_list_toplevels ();
 989
 990   for (l = list; l; l = l->next)
 991     gtk_container_forall (GTK_CONTAINER (l->data),
 992                           traverse_container, NULL);
 993
 994   g_list_free (list);
 995 }
 996
 997 static void
 998 gtk_scrolled_window_screen_changed (GtkWidget *widget,
 999                                     GdkScreen *previous_screen)
1000 {
1001   GtkSettings *settings;
1002   guint window_placement_connection;
1003
1004   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1005
1006   if (!gtk_widget_has_screen (widget))
1007     return;
1008
1009   settings = gtk_widget_get_settings (widget);
1010
1011   window_placement_connection =
1012     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
1013                                          "gtk-scrolled-window-connection"));
1014
1015   if (window_placement_connection)
1016     return;
1017
1018   window_placement_connection =
1019     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
1020                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
1021   g_object_set_data (G_OBJECT (settings),
1022                      I_("gtk-scrolled-window-connection"),
1023                      GUINT_TO_POINTER (window_placement_connection));
1024 }
1025
1026 static void
1027 gtk_scrolled_window_paint (GtkWidget    *widget,
1028                            GdkRectangle *area)
1029 {
1030   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1031
1032   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1033     {
1034       GtkAllocation relative_allocation;
1035       gboolean scrollbars_within_bevel;
1036
1037       gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1038
1039       if (!scrollbars_within_bevel)
1040         {
1041           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1042
1043           relative_allocation.x -= widget->style->xthickness;
1044           relative_allocation.y -= widget->style->ythickness;
1045           relative_allocation.width += 2 * widget->style->xthickness;
1046           relative_allocation.height += 2 * widget->style->ythickness;
1047         }
1048       else
1049         {
1050           GtkContainer *container = GTK_CONTAINER (widget);
1051
1052           relative_allocation.x = container->border_width;
1053           relative_allocation.y = container->border_width;
1054           relative_allocation.width = widget->allocation.width - 2 * container->border_width;
1055           relative_allocation.height = widget->allocation.height - 2 * container->border_width;
1056         }
1057
1058       gtk_paint_shadow (widget->style, widget->window,
1059                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
1060                         area, widget, "scrolled_window",
1061                         widget->allocation.x + relative_allocation.x,
1062                         widget->allocation.y + relative_allocation.y,
1063                         relative_allocation.width,
1064                         relative_allocation.height);
1065     }
1066 }
1067
1068 static gboolean
1069 gtk_scrolled_window_expose (GtkWidget      *widget,
1070                             GdkEventExpose *event)
1071 {
1072   if (GTK_WIDGET_DRAWABLE (widget))
1073     {
1074       gtk_scrolled_window_paint (widget, &event->area);
1075
1076       GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->expose_event (widget, event);
1077     }
1078
1079   return FALSE;
1080 }
1081
1082 static void
1083 gtk_scrolled_window_forall (GtkContainer *container,
1084                             gboolean      include_internals,
1085                             GtkCallback   callback,
1086                             gpointer      callback_data)
1087 {
1088   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1089   g_return_if_fail (callback != NULL);
1090
1091   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
1092                                               include_internals,
1093                                               callback,
1094                                               callback_data);
1095   if (include_internals)
1096     {
1097       GtkScrolledWindow *scrolled_window;
1098
1099       scrolled_window = GTK_SCROLLED_WINDOW (container);
1100
1101       if (scrolled_window->vscrollbar)
1102         callback (scrolled_window->vscrollbar, callback_data);
1103       if (scrolled_window->hscrollbar)
1104         callback (scrolled_window->hscrollbar, callback_data);
1105     }
1106 }
1107
1108 static gboolean
1109 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1110                                   GtkScrollType      scroll,
1111                                   gboolean           horizontal)
1112 {
1113   GtkAdjustment *adjustment = NULL;
1114
1115   switch (scroll)
1116     {
1117     case GTK_SCROLL_STEP_UP:
1118       scroll = GTK_SCROLL_STEP_BACKWARD;
1119       horizontal = FALSE;
1120       break;
1121     case GTK_SCROLL_STEP_DOWN:
1122       scroll = GTK_SCROLL_STEP_FORWARD;
1123       horizontal = FALSE;
1124       break;
1125     case GTK_SCROLL_STEP_LEFT:
1126       scroll = GTK_SCROLL_STEP_BACKWARD;
1127       horizontal = TRUE;
1128       break;
1129     case GTK_SCROLL_STEP_RIGHT:
1130       scroll = GTK_SCROLL_STEP_FORWARD;
1131       horizontal = TRUE;
1132       break;
1133     case GTK_SCROLL_PAGE_UP:
1134       scroll = GTK_SCROLL_PAGE_BACKWARD;
1135       horizontal = FALSE;
1136       break;
1137     case GTK_SCROLL_PAGE_DOWN:
1138       scroll = GTK_SCROLL_PAGE_FORWARD;
1139       horizontal = FALSE;
1140       break;
1141     case GTK_SCROLL_PAGE_LEFT:
1142       scroll = GTK_SCROLL_STEP_BACKWARD;
1143       horizontal = TRUE;
1144       break;
1145     case GTK_SCROLL_PAGE_RIGHT:
1146       scroll = GTK_SCROLL_STEP_FORWARD;
1147       horizontal = TRUE;
1148       break;
1149     case GTK_SCROLL_STEP_BACKWARD:
1150     case GTK_SCROLL_STEP_FORWARD:
1151     case GTK_SCROLL_PAGE_BACKWARD:
1152     case GTK_SCROLL_PAGE_FORWARD:
1153     case GTK_SCROLL_START:
1154     case GTK_SCROLL_END:
1155       break;
1156     default:
1157       g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
1158       return FALSE;
1159     }
1160
1161   if ((horizontal && (!scrolled_window->hscrollbar || !scrolled_window->hscrollbar_visible)) ||
1162       (!horizontal && (!scrolled_window->vscrollbar || !scrolled_window->vscrollbar_visible)))
1163     return FALSE;
1164
1165   if (horizontal)
1166     {
1167       if (scrolled_window->hscrollbar)
1168         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
1169     }
1170   else
1171     {
1172       if (scrolled_window->vscrollbar)
1173         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
1174     }
1175
1176   if (adjustment)
1177     {
1178       gdouble value = adjustment->value;
1179
1180       switch (scroll)
1181         {
1182         case GTK_SCROLL_STEP_FORWARD:
1183           value += adjustment->step_increment;
1184           break;
1185         case GTK_SCROLL_STEP_BACKWARD:
1186           value -= adjustment->step_increment;
1187           break;
1188         case GTK_SCROLL_PAGE_FORWARD:
1189           value += adjustment->page_increment;
1190           break;
1191         case GTK_SCROLL_PAGE_BACKWARD:
1192           value -= adjustment->page_increment;
1193           break;
1194         case GTK_SCROLL_START:
1195           value = adjustment->lower;
1196           break;
1197         case GTK_SCROLL_END:
1198           value = adjustment->upper;
1199           break;
1200         default:
1201           g_assert_not_reached ();
1202           break;
1203         }
1204
1205       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
1206
1207       gtk_adjustment_set_value (adjustment, value);
1208
1209       return TRUE;
1210     }
1211
1212   return FALSE;
1213 }
1214
1215 static void
1216 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1217                                     GtkDirectionType   direction_type)
1218 {
1219   GtkWidget *toplevel;
1220
1221   /* Focus out of the scrolled window entirely. We do this by setting
1222    * a flag, then propagating the focus motion to the notebook.
1223    */
1224   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1225   if (!gtk_widget_is_toplevel (toplevel))
1226     return;
1227
1228   g_object_ref (scrolled_window);
1229
1230   scrolled_window->focus_out = TRUE;
1231   g_signal_emit_by_name (toplevel, "move-focus", direction_type);
1232   scrolled_window->focus_out = FALSE;
1233
1234   g_object_unref (scrolled_window);
1235 }
1236
1237 static void
1238 gtk_scrolled_window_real_size_request (GtkWidget      *widget,
1239                                        GtkRequisition *min_requisition,
1240                                        GtkRequisition *nat_requisition)
1241 {
1242   GtkScrolledWindow *scrolled_window;
1243   GtkBin *bin;
1244   gint extra_width;
1245   gint extra_height;
1246   gint scrollbar_spacing;
1247   GtkRequisition hscrollbar_requisition;
1248   GtkRequisition vscrollbar_requisition;
1249   GtkRequisition min_child_requisition;
1250   GtkRequisition nat_child_requisition;
1251
1252   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1253
1254   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1255   bin = GTK_BIN (scrolled_window);
1256
1257   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1258
1259   extra_width = 0;
1260   extra_height = 0;
1261   min_requisition->width = 0;
1262   min_requisition->height = 0;
1263   nat_requisition->width = 0;
1264   nat_requisition->height = 0;
1265
1266   gtk_widget_size_request (scrolled_window->hscrollbar,
1267                            &hscrollbar_requisition);
1268   gtk_widget_size_request (scrolled_window->vscrollbar,
1269                            &vscrollbar_requisition);
1270
1271   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1272     {
1273       gtk_extended_layout_get_desired_size (GTK_EXTENDED_LAYOUT (bin->child),
1274                                             &min_child_requisition,
1275                                             &nat_child_requisition);
1276
1277       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1278         {
1279           min_requisition->width += min_child_requisition.width;
1280           nat_requisition->width += nat_child_requisition.width;
1281         }
1282       else
1283         {
1284           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1285
1286           if (aux_info && aux_info->width > 0)
1287             {
1288               min_requisition->width += aux_info->width;
1289               nat_requisition->width += aux_info->width;
1290               extra_width = -1;
1291             }
1292           else
1293             {
1294               min_requisition->width += vscrollbar_requisition.width;
1295               nat_requisition->width += vscrollbar_requisition.width;
1296             }
1297         }
1298
1299       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1300         {
1301           min_requisition->height += min_child_requisition.height;
1302           nat_requisition->height += nat_child_requisition.height;
1303         }
1304       else
1305         {
1306           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1307
1308           if (aux_info && aux_info->height > 0)
1309             {
1310               min_requisition->height += aux_info->height;
1311               nat_requisition->height += aux_info->height;
1312               extra_height = -1;
1313             }
1314           else
1315             {
1316               min_requisition->height += hscrollbar_requisition.height;
1317               nat_requisition->height += hscrollbar_requisition.height;
1318             }
1319         }
1320     }
1321
1322   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1323       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1324     {
1325       min_requisition->width = MAX (min_requisition->width, hscrollbar_requisition.width);
1326       nat_requisition->width = MAX (nat_requisition->width, hscrollbar_requisition.width);
1327       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1328         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1329     }
1330
1331   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1332       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1333     {
1334       min_requisition->height = MAX (min_requisition->height, vscrollbar_requisition.height);
1335       nat_requisition->height = MAX (nat_requisition->height, vscrollbar_requisition.height);
1336       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1337         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1338     }
1339
1340   min_requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
1341   min_requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
1342   nat_requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
1343   nat_requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
1344
1345   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1346     {
1347       min_requisition->width += 2 * widget->style->xthickness;
1348       min_requisition->height += 2 * widget->style->ythickness;
1349       nat_requisition->width += 2 * widget->style->xthickness;
1350       nat_requisition->height += 2 * widget->style->ythickness;
1351     }
1352 }
1353
1354 static void
1355 gtk_scrolled_window_size_request (GtkWidget      *widget,
1356                                  GtkRequisition *requisition)
1357 {
1358   GtkRequisition nat_req;
1359
1360   gtk_scrolled_window_real_size_request (widget, requisition, &nat_req);
1361 }
1362
1363 static void
1364 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1365                                          GtkAllocation *allocation)
1366 {
1367   GtkScrolledWindow *scrolled_window;
1368   GtkScrolledWindowPrivate *priv;
1369   gint scrollbar_spacing;
1370
1371   g_return_if_fail (widget != NULL);
1372   g_return_if_fail (allocation != NULL);
1373
1374   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1375   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1376
1377   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1378
1379   allocation->x = GTK_CONTAINER (widget)->border_width;
1380   allocation->y = GTK_CONTAINER (widget)->border_width;
1381
1382   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1383     {
1384       allocation->x += widget->style->xthickness;
1385       allocation->y += widget->style->ythickness;
1386     }
1387
1388   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1389   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1390
1391   if (scrolled_window->vscrollbar_visible)
1392     {
1393       GtkRequisition vscrollbar_requisition;
1394       gboolean is_rtl;
1395
1396       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1397                                         &vscrollbar_requisition);
1398       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1399
1400       if ((!is_rtl &&
1401            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1402             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1403           (is_rtl &&
1404            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1405             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1406         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1407
1408       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1409     }
1410   if (scrolled_window->hscrollbar_visible)
1411     {
1412       GtkRequisition hscrollbar_requisition;
1413       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1414                                         &hscrollbar_requisition);
1415
1416       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1417           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1418         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1419
1420       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1421     }
1422 }
1423
1424 static void
1425 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1426                                    GtkAllocation *allocation)
1427 {
1428   GtkScrolledWindow *scrolled_window;
1429   GtkScrolledWindowPrivate *priv;
1430   GtkBin *bin;
1431   GtkAllocation relative_allocation;
1432   GtkAllocation child_allocation;
1433   gboolean scrollbars_within_bevel;
1434   gint scrollbar_spacing;
1435
1436   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1437   g_return_if_fail (allocation != NULL);
1438
1439   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1440   bin = GTK_BIN (scrolled_window);
1441
1442   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1443   gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1444
1445   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1446
1447   widget->allocation = *allocation;
1448
1449   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1450     scrolled_window->hscrollbar_visible = TRUE;
1451   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1452     scrolled_window->hscrollbar_visible = FALSE;
1453   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1454     scrolled_window->vscrollbar_visible = TRUE;
1455   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1456     scrolled_window->vscrollbar_visible = FALSE;
1457
1458   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1459     {
1460       gboolean previous_hvis;
1461       gboolean previous_vvis;
1462       guint count = 0;
1463
1464       do
1465         {
1466           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1467
1468           child_allocation.x = relative_allocation.x + allocation->x;
1469           child_allocation.y = relative_allocation.y + allocation->y;
1470           child_allocation.width = relative_allocation.width;
1471           child_allocation.height = relative_allocation.height;
1472
1473           previous_hvis = scrolled_window->hscrollbar_visible;
1474           previous_vvis = scrolled_window->vscrollbar_visible;
1475
1476           gtk_widget_size_allocate (bin->child, &child_allocation);
1477
1478           /* If, after the first iteration, the hscrollbar and the
1479            * vscrollbar flip visiblity, then we need both.
1480            */
1481           if (count &&
1482               previous_hvis != scrolled_window->hscrollbar_visible &&
1483               previous_vvis != scrolled_window->vscrollbar_visible)
1484             {
1485               scrolled_window->hscrollbar_visible = TRUE;
1486               scrolled_window->vscrollbar_visible = TRUE;
1487
1488               /* a new resize is already queued at this point,
1489                * so we will immediatedly get reinvoked
1490                */
1491               return;
1492             }
1493
1494           count++;
1495         }
1496       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1497              previous_vvis != scrolled_window->vscrollbar_visible);
1498     }
1499   else
1500     {
1501       scrolled_window->hscrollbar_visible = scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS;
1502       scrolled_window->vscrollbar_visible = scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS;
1503       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1504     }
1505
1506   if (scrolled_window->hscrollbar_visible)
1507     {
1508       GtkRequisition hscrollbar_requisition;
1509       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1510                                         &hscrollbar_requisition);
1511
1512       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1513         gtk_widget_show (scrolled_window->hscrollbar);
1514
1515       child_allocation.x = relative_allocation.x;
1516       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1517           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1518         child_allocation.y = (relative_allocation.y +
1519                               relative_allocation.height +
1520                               scrollbar_spacing +
1521                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1522                                0 : widget->style->ythickness));
1523       else
1524         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1525
1526       child_allocation.width = relative_allocation.width;
1527       child_allocation.height = hscrollbar_requisition.height;
1528       child_allocation.x += allocation->x;
1529       child_allocation.y += allocation->y;
1530
1531       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1532         {
1533           if (!scrollbars_within_bevel)
1534             {
1535               child_allocation.x -= widget->style->xthickness;
1536               child_allocation.width += 2 * widget->style->xthickness;
1537             }
1538           else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
1539                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1540             {
1541               child_allocation.y -= widget->style->ythickness;
1542             }
1543           else
1544             {
1545               child_allocation.y += widget->style->ythickness;
1546             }
1547         }
1548
1549       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1550     }
1551   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1552     gtk_widget_hide (scrolled_window->hscrollbar);
1553
1554   if (scrolled_window->vscrollbar_visible)
1555     {
1556       GtkRequisition vscrollbar_requisition;
1557       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1558         gtk_widget_show (scrolled_window->vscrollbar);
1559
1560       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1561                                         &vscrollbar_requisition);
1562
1563       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1564            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1565             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1566           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1567            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1568             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1569         child_allocation.x = (relative_allocation.x +
1570                               relative_allocation.width +
1571                               scrollbar_spacing +
1572                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1573                                0 : widget->style->xthickness));
1574       else
1575         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1576
1577       child_allocation.y = relative_allocation.y;
1578       child_allocation.width = vscrollbar_requisition.width;
1579       child_allocation.height = relative_allocation.height;
1580       child_allocation.x += allocation->x;
1581       child_allocation.y += allocation->y;
1582
1583       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1584         {
1585           if (!scrollbars_within_bevel)
1586             {
1587               child_allocation.y -= widget->style->ythickness;
1588               child_allocation.height += 2 * widget->style->ythickness;
1589             }
1590           else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
1591                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1592             {
1593               child_allocation.x -= widget->style->xthickness;
1594             }
1595           else
1596             {
1597               child_allocation.x += widget->style->xthickness;
1598             }
1599         }
1600
1601       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1602     }
1603   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1604     gtk_widget_hide (scrolled_window->vscrollbar);
1605 }
1606
1607 static gboolean
1608 gtk_scrolled_window_scroll_event (GtkWidget      *widget,
1609                                   GdkEventScroll *event)
1610 {
1611   GtkWidget *range;
1612
1613   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1614   g_return_val_if_fail (event != NULL, FALSE);
1615
1616   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1617     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1618   else
1619     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1620
1621   if (range && GTK_WIDGET_VISIBLE (range))
1622     {
1623       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1624       gdouble delta, new_value;
1625
1626       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1627
1628       new_value = CLAMP (adj->value + delta, adj->lower, adj->upper - adj->page_size);
1629
1630       gtk_adjustment_set_value (adj, new_value);
1631
1632       return TRUE;
1633     }
1634
1635   return FALSE;
1636 }
1637
1638 static gboolean
1639 gtk_scrolled_window_focus (GtkWidget        *widget,
1640                            GtkDirectionType  direction)
1641 {
1642   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1643   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1644
1645   if (scrolled_window->focus_out)
1646     {
1647       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1648       return FALSE;
1649     }
1650
1651   if (gtk_widget_is_focus (widget))
1652     return FALSE;
1653
1654   /* We only put the scrolled window itself in the focus chain if it
1655    * isn't possible to focus any children.
1656    */
1657   if (GTK_BIN (widget)->child)
1658     {
1659       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1660         return TRUE;
1661     }
1662
1663   if (!had_focus_child && GTK_WIDGET_CAN_FOCUS (widget))
1664     {
1665       gtk_widget_grab_focus (widget);
1666       return TRUE;
1667     }
1668   else
1669     return FALSE;
1670 }
1671
1672 static void
1673 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1674                                         gpointer       data)
1675 {
1676   GtkScrolledWindow *scrolled_win;
1677
1678   g_return_if_fail (adjustment != NULL);
1679   g_return_if_fail (data != NULL);
1680
1681   scrolled_win = GTK_SCROLLED_WINDOW (data);
1682
1683   if (scrolled_win->hscrollbar &&
1684       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1685     {
1686       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1687         {
1688           gboolean visible;
1689
1690           visible = scrolled_win->hscrollbar_visible;
1691           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1692                                               adjustment->page_size);
1693           if (scrolled_win->hscrollbar_visible != visible)
1694             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1695         }
1696     }
1697   else if (scrolled_win->vscrollbar &&
1698            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1699     {
1700       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1701         {
1702           gboolean visible;
1703
1704           visible = scrolled_win->vscrollbar_visible;
1705           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1706                                               adjustment->page_size);
1707           if (scrolled_win->vscrollbar_visible != visible)
1708             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1709         }
1710     }
1711 }
1712
1713 static void
1714 gtk_scrolled_window_add (GtkContainer *container,
1715                          GtkWidget    *child)
1716 {
1717   GtkScrolledWindow *scrolled_window;
1718   GtkBin *bin;
1719
1720   bin = GTK_BIN (container);
1721   g_return_if_fail (bin->child == NULL);
1722
1723   scrolled_window = GTK_SCROLLED_WINDOW (container);
1724
1725   bin->child = child;
1726   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1727
1728   /* this is a temporary message */
1729   if (!gtk_widget_set_scroll_adjustments (child,
1730                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1731                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1732     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1733                "use gtk_scrolled_window_add_with_viewport() instead");
1734 }
1735
1736 static void
1737 gtk_scrolled_window_remove (GtkContainer *container,
1738                             GtkWidget    *child)
1739 {
1740   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1741   g_return_if_fail (child != NULL);
1742   g_return_if_fail (GTK_BIN (container)->child == child);
1743
1744   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1745
1746   /* chain parent class handler to remove child */
1747   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1748 }
1749
1750 /**
1751  * gtk_scrolled_window_add_with_viewport:
1752  * @scrolled_window: a #GtkScrolledWindow
1753  * @child: the widget you want to scroll
1754  *
1755  * Used to add children without native scrolling capabilities. This
1756  * is simply a convenience function; it is equivalent to adding the
1757  * unscrollable child to a viewport, then adding the viewport to the
1758  * scrolled window. If a child has native scrolling, use
1759  * gtk_container_add() instead of this function.
1760  *
1761  * The viewport scrolls the child by moving its #GdkWindow, and takes
1762  * the size of the child to be the size of its toplevel #GdkWindow.
1763  * This will be very wrong for most widgets that support native scrolling;
1764  * for example, if you add a widget such as #GtkTreeView with a viewport,
1765  * the whole widget will scroll, including the column headings. Thus,
1766  * widgets with native scrolling support should not be used with the
1767  * #GtkViewport proxy.
1768  *
1769  * A widget supports scrolling natively if the
1770  * set_scroll_adjustments_signal field in #GtkWidgetClass is non-zero,
1771  * i.e. has been filled in with a valid signal identifier.
1772  */
1773 void
1774 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1775                                        GtkWidget         *child)
1776 {
1777   GtkBin *bin;
1778   GtkWidget *viewport;
1779
1780   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1781   g_return_if_fail (GTK_IS_WIDGET (child));
1782   g_return_if_fail (child->parent == NULL);
1783
1784   bin = GTK_BIN (scrolled_window);
1785
1786   if (bin->child != NULL)
1787     {
1788       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1789       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1790
1791       viewport = bin->child;
1792     }
1793   else
1794     {
1795       viewport =
1796         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1797                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1798       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1799     }
1800
1801   gtk_widget_show (viewport);
1802   gtk_container_add (GTK_CONTAINER (viewport), child);
1803 }
1804
1805 /*
1806  * _gtk_scrolled_window_get_spacing:
1807  * @scrolled_window: a scrolled window
1808  *
1809  * Gets the spacing between the scrolled window's scrollbars and
1810  * the scrolled widget. Used by GtkCombo
1811  *
1812  * Return value: the spacing, in pixels.
1813  */
1814 gint
1815 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1816 {
1817   GtkScrolledWindowClass *class;
1818
1819   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1820
1821   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1822
1823   if (class->scrollbar_spacing >= 0)
1824     return class->scrollbar_spacing;
1825   else
1826     {
1827       gint scrollbar_spacing;
1828
1829       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1830                             "scrollbar-spacing", &scrollbar_spacing,
1831                             NULL);
1832
1833       return scrollbar_spacing;
1834     }
1835 }
1836
1837 static void
1838 gtk_scrolled_window_extended_layout_get_desired_size (GtkExtendedLayout *layout,
1839                                                       GtkRequisition    *minimal_size,
1840                                                       GtkRequisition    *natural_size)
1841 {
1842   GtkRequisition min_req, nat_req;
1843
1844   gtk_scrolled_window_real_size_request (GTK_WIDGET (layout), &min_req, &nat_req);
1845
1846   if (minimal_size)
1847     *minimal_size = min_req;
1848
1849   if (natural_size)
1850     *natural_size = nat_req;
1851 }
1852
1853 static void
1854 gtk_scrolled_window_extended_layout_init (GtkExtendedLayoutIface *iface)
1855 {
1856   iface->get_desired_size = gtk_scrolled_window_extended_layout_get_desired_size;
1857 }
1858
1859 #define __GTK_SCROLLED_WINDOW_C__
1860 #include "gtkaliasdef.c"