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_allocate      (GtkWidget         *widget,
 118                                                         GtkAllocation     *allocation);
 119 static gboolean gtk_scrolled_window_scroll_event       (GtkWidget         *widget,
 120                                                         GdkEventScroll    *event);
 121 static gboolean gtk_scrolled_window_focus              (GtkWidget         *widget,
 122                                                         GtkDirectionType   direction);
 123 static void     gtk_scrolled_window_add                (GtkContainer      *container,
 124                                                         GtkWidget         *widget);
 125 static void     gtk_scrolled_window_remove             (GtkContainer      *container,
 126                                                         GtkWidget         *widget);
 127 static void     gtk_scrolled_window_forall             (GtkContainer      *container,
 128                                                         gboolean           include_internals,
 129                                                         GtkCallback        callback,
 130                                                         gpointer           callback_data);
 131 static gboolean gtk_scrolled_window_scroll_child       (GtkScrolledWindow *scrolled_window,
 132                                                         GtkScrollType      scroll,
 133                                                         gboolean           horizontal);
 134 static void     gtk_scrolled_window_move_focus_out     (GtkScrolledWindow *scrolled_window,
 135                                                         GtkDirectionType   direction_type);
 136
 137 static void     gtk_scrolled_window_relative_allocation(GtkWidget         *widget,
 138                                                         GtkAllocation     *allocation);
 139 static void     gtk_scrolled_window_adjustment_changed (GtkAdjustment     *adjustment,
 140                                                         gpointer           data);
 141
 142 static void  gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window);
 143
 144 static void  gtk_scrolled_window_extended_layout_init  (GtkExtendedLayoutIface *iface);
 145 static void  gtk_scrolled_window_get_desired_width     (GtkExtendedLayout      *layout,
 146                                                         gint                   *minimum_size,
 147                                                         gint                   *natural_size);
 148 static void  gtk_scrolled_window_get_desired_height    (GtkExtendedLayout      *layout,
 149                                                         gint                   *minimum_size,
 150                                                         gint                   *natural_size);
 151 static void  gtk_scrolled_window_get_height_for_width  (GtkExtendedLayout      *layout,
 152                                                         gint                    width,
 153                                                         gint                   *minimum_height,
 154                                                         gint                   *natural_height);
 155 static void  gtk_scrolled_window_get_width_for_height  (GtkExtendedLayout      *layout,
 156                                                         gint                    width,
 157                                                         gint                   *minimum_height,
 158                                                         gint                   *natural_height);
 159
 160 static guint signals[LAST_SIGNAL] = {0};
 161
 162 G_DEFINE_TYPE_WITH_CODE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN,
 163                          G_IMPLEMENT_INTERFACE (GTK_TYPE_EXTENDED_LAYOUT,
 164                                                 gtk_scrolled_window_extended_layout_init))
 165
 166
 167 static void
 168 add_scroll_binding (GtkBindingSet  *binding_set,
 169                     guint           keyval,
 170                     GdkModifierType mask,
 171                     GtkScrollType   scroll,
 172                     gboolean        horizontal)
 173 {
 174   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 175
 176   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 177                                 "scroll-child", 2,
 178                                 GTK_TYPE_SCROLL_TYPE, scroll,
 179                                 G_TYPE_BOOLEAN, horizontal);
 180   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 181                                 "scroll-child", 2,
 182                                 GTK_TYPE_SCROLL_TYPE, scroll,
 183                                 G_TYPE_BOOLEAN, horizontal);
 184 }
 185
 186 static void
 187 add_tab_bindings (GtkBindingSet    *binding_set,
 188                   GdkModifierType   modifiers,
 189                   GtkDirectionType  direction)
 190 {
 191   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 192                                 "move-focus-out", 1,
 193                                 GTK_TYPE_DIRECTION_TYPE, direction);
 194   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 195                                 "move-focus-out", 1,
 196                                 GTK_TYPE_DIRECTION_TYPE, direction);
 197 }
 198
 199 static void
 200 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 201 {
 202   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 203   GtkObjectClass *object_class;
 204   GtkWidgetClass *widget_class;
 205   GtkContainerClass *container_class;
 206   GtkBindingSet *binding_set;
 207
 208   object_class = (GtkObjectClass*) class;
 209   widget_class = (GtkWidgetClass*) class;
 210   container_class = (GtkContainerClass*) class;
 211
 212   gobject_class->set_property = gtk_scrolled_window_set_property;
 213   gobject_class->get_property = gtk_scrolled_window_get_property;
 214
 215   object_class->destroy = gtk_scrolled_window_destroy;
 216
 217   widget_class->screen_changed = gtk_scrolled_window_screen_changed;
 218   widget_class->expose_event = gtk_scrolled_window_expose;
 219   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 220   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 221   widget_class->focus = gtk_scrolled_window_focus;
 222
 223   container_class->add = gtk_scrolled_window_add;
 224   container_class->remove = gtk_scrolled_window_remove;
 225   container_class->forall = gtk_scrolled_window_forall;
 226
 227   class->scrollbar_spacing = -1;
 228
 229   class->scroll_child = gtk_scrolled_window_scroll_child;
 230   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 231
 232   g_object_class_install_property (gobject_class,
 233                                    PROP_HADJUSTMENT,
 234                                    g_param_spec_object ("hadjustment",
 235                                                         P_("Horizontal Adjustment"),
 236                                                         P_("The GtkAdjustment for the horizontal position"),
 237                                                         GTK_TYPE_ADJUSTMENT,
 238                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 239   g_object_class_install_property (gobject_class,
 240                                    PROP_VADJUSTMENT,
 241                                    g_param_spec_object ("vadjustment",
 242                                                         P_("Vertical Adjustment"),
 243                                                         P_("The GtkAdjustment for the vertical position"),
 244                                                         GTK_TYPE_ADJUSTMENT,
 245                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 246   g_object_class_install_property (gobject_class,
 247                                    PROP_HSCROLLBAR_POLICY,
 248                                    g_param_spec_enum ("hscrollbar-policy",
 249                                                       P_("Horizontal Scrollbar Policy"),
 250                                                       P_("When the horizontal scrollbar is displayed"),
 251                                                       GTK_TYPE_POLICY_TYPE,
 252                                                       GTK_POLICY_ALWAYS,
 253                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 254   g_object_class_install_property (gobject_class,
 255                                    PROP_VSCROLLBAR_POLICY,
 256                                    g_param_spec_enum ("vscrollbar-policy",
 257                                                       P_("Vertical Scrollbar Policy"),
 258                                                       P_("When the vertical scrollbar is displayed"),
 259                                                       GTK_TYPE_POLICY_TYPE,
 260                                                       GTK_POLICY_ALWAYS,
 261                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 262
 263   g_object_class_install_property (gobject_class,
 264                                    PROP_WINDOW_PLACEMENT,
 265                                    g_param_spec_enum ("window-placement",
 266                                                       P_("Window Placement"),
 267                                                       P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
 268                                                       GTK_TYPE_CORNER_TYPE,
 269                                                       GTK_CORNER_TOP_LEFT,
 270                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 271
 272   /**
 273    * GtkScrolledWindow:window-placement-set:
 274    *
 275    * Whether "window-placement" should be used to determine the location
 276    * of the contents with respect to the scrollbars. Otherwise, the
 277    * "gtk-scrolled-window-placement" setting is used.
 278    *
 279    * Since: 2.10
 280    */
 281   g_object_class_install_property (gobject_class,
 282                                    PROP_WINDOW_PLACEMENT_SET,
 283                                    g_param_spec_boolean ("window-placement-set",
 284                                                          P_("Window Placement Set"),
 285                                                          P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
 286                                                          FALSE,
 287                                                          GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 288   g_object_class_install_property (gobject_class,
 289                                    PROP_SHADOW_TYPE,
 290                                    g_param_spec_enum ("shadow-type",
 291                                                       P_("Shadow Type"),
 292                                                       P_("Style of bevel around the contents"),
 293                                                       GTK_TYPE_SHADOW_TYPE,
 294                                                       GTK_SHADOW_NONE,
 295                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 296
 297   /**
 298    * GtkScrolledWindow:scrollbars-within-bevel:
 299    *
 300    * Whether to place scrollbars within the scrolled window's bevel.
 301    *
 302    * Since: 2.12
 303    */
 304   gtk_widget_class_install_style_property (widget_class,
 305                                            g_param_spec_boolean ("scrollbars-within-bevel",
 306                                                                  P_("Scrollbars within bevel"),
 307                                                                  P_("Place scrollbars within the scrolled window's bevel"),
 308                                                                  FALSE,
 309                                                                  GTK_PARAM_READABLE));
 310
 311   gtk_widget_class_install_style_property (widget_class,
 312                                            g_param_spec_int ("scrollbar-spacing",
 313                                                              P_("Scrollbar spacing"),
 314                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 315                                                              0,
 316                                                              G_MAXINT,
 317                                                              DEFAULT_SCROLLBAR_SPACING,
 318                                                              GTK_PARAM_READABLE));
 319
 320   /**
 321    * GtkSettings:gtk-scrolled-window-placement:
 322    *
 323    * Where the contents of scrolled windows are located with respect to the
 324    * scrollbars, if not overridden by the scrolled window's own placement.
 325    *
 326    * Since: 2.10
 327    */
 328   gtk_settings_install_property (g_param_spec_enum ("gtk-scrolled-window-placement",
 329                                                     P_("Scrolled Window Placement"),
 330                                                     P_("Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement."),
 331                                                     GTK_TYPE_CORNER_TYPE,
 332                                                     GTK_CORNER_TOP_LEFT,
 333                                                     G_PARAM_READABLE | G_PARAM_WRITABLE));
 334
 335
 336   signals[SCROLL_CHILD] =
 337     g_signal_new (I_("scroll-child"),
 338                   G_TYPE_FROM_CLASS (object_class),
 339                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 340                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 341                   NULL, NULL,
 342                   _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
 343                   G_TYPE_BOOLEAN, 2,
 344                   GTK_TYPE_SCROLL_TYPE,
 345                   G_TYPE_BOOLEAN);
 346   signals[MOVE_FOCUS_OUT] =
 347     g_signal_new (I_("move-focus-out"),
 348                   G_TYPE_FROM_CLASS (object_class),
 349                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 350                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 351                   NULL, NULL,
 352                   _gtk_marshal_VOID__ENUM,
 353                   G_TYPE_NONE, 1,
 354                   GTK_TYPE_DIRECTION_TYPE);
 355
 356   binding_set = gtk_binding_set_by_class (class);
 357
 358   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 359   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 360   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 361   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 362
 363   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 364   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 365   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 366   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 367
 368   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 369   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 370   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 371   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 372
 373   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 374   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 375
 376   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 377 }
 378
 379 static void
 380 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 381 {
 382   gtk_widget_set_has_window (GTK_WIDGET (scrolled_window), FALSE);
 383   gtk_widget_set_can_focus (GTK_WIDGET (scrolled_window), TRUE);
 384
 385   scrolled_window->hscrollbar = NULL;
 386   scrolled_window->vscrollbar = NULL;
 387   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 388   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 389   scrolled_window->hscrollbar_visible = FALSE;
 390   scrolled_window->vscrollbar_visible = FALSE;
 391   scrolled_window->focus_out = FALSE;
 392   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 393   gtk_scrolled_window_update_real_placement (scrolled_window);
 394 }
 395
 396 /**
 397  * gtk_scrolled_window_new:
 398  * @hadjustment: (allow-none): horizontal adjustment
 399  * @vadjustment: (allow-none): vertical adjustment
 400 <<<<<<< HEAD
 401  *
 402  * Creates a new scrolled window.
 403  *
 404 =======
 405  *
 406  * Creates a new scrolled window.
 407  *
 408 >>>>>>> native-layout-incubator
 409  * The two arguments are the scrolled window's adjustments; these will be
 410  * shared with the scrollbars and the child widget to keep the bars in sync
 411  * with the child. Usually you want to pass %NULL for the adjustments, which
 412  * will cause the scrolled window to create them for you.
 413  *
 414  * Returns: a new scrolled window
 415  */
 416 GtkWidget*
 417 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 418                          GtkAdjustment *vadjustment)
 419 {
 420   GtkWidget *scrolled_window;
 421
 422   if (hadjustment)
 423     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 424
 425   if (vadjustment)
 426     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 427
 428   scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
 429                                     "hadjustment", hadjustment,
 430                                     "vadjustment", vadjustment,
 431                                     NULL);
 432
 433   return scrolled_window;
 434 }
 435
 436 /**
 437  * gtk_scrolled_window_set_hadjustment:
 438  * @scrolled_window: a #GtkScrolledWindow
 439  * @hadjustment: horizontal scroll adjustment
 440  *
 441  * Sets the #GtkAdjustment for the horizontal scrollbar.
 442  */
 443 void
 444 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 445                                      GtkAdjustment     *hadjustment)
 446 {
 447   GtkBin *bin;
 448
 449   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 450   if (hadjustment)
 451     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 452   else
 453     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 454
 455   bin = GTK_BIN (scrolled_window);
 456
 457   if (!scrolled_window->hscrollbar)
 458     {
 459       gtk_widget_push_composite_child ();
 460       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 461       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 462       gtk_widget_pop_composite_child ();
 463
 464       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 465       g_object_ref (scrolled_window->hscrollbar);
 466       gtk_widget_show (scrolled_window->hscrollbar);
 467     }
 468   else
 469     {
 470       GtkAdjustment *old_adjustment;
 471
 472       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 473       if (old_adjustment == hadjustment)
 474         return;
 475
 476       g_signal_handlers_disconnect_by_func (old_adjustment,
 477                                             gtk_scrolled_window_adjustment_changed,
 478                                             scrolled_window);
 479       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 480                                 hadjustment);
 481     }
 482   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 483   g_signal_connect (hadjustment,
 484                     "changed",
 485                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 486                     scrolled_window);
 487   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 488
 489   if (bin->child)
 490     gtk_widget_set_scroll_adjustments (bin->child,
 491                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 492                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 493
 494   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 495 }
 496
 497 /**
 498  * gtk_scrolled_window_set_vadjustment:
 499  * @scrolled_window: a #GtkScrolledWindow
 500  * @vadjustment: vertical scroll adjustment
 501  *
 502  * Sets the #GtkAdjustment for the vertical scrollbar.
 503  */
 504 void
 505 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 506                                      GtkAdjustment     *vadjustment)
 507 {
 508   GtkBin *bin;
 509
 510   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 511   if (vadjustment)
 512     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 513   else
 514     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 515
 516   bin = GTK_BIN (scrolled_window);
 517
 518   if (!scrolled_window->vscrollbar)
 519     {
 520       gtk_widget_push_composite_child ();
 521       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 522       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 523       gtk_widget_pop_composite_child ();
 524
 525       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 526       g_object_ref (scrolled_window->vscrollbar);
 527       gtk_widget_show (scrolled_window->vscrollbar);
 528     }
 529   else
 530     {
 531       GtkAdjustment *old_adjustment;
 532
 533       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 534       if (old_adjustment == vadjustment)
 535         return;
 536
 537       g_signal_handlers_disconnect_by_func (old_adjustment,
 538                                             gtk_scrolled_window_adjustment_changed,
 539                                             scrolled_window);
 540       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 541                                 vadjustment);
 542     }
 543   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 544   g_signal_connect (vadjustment,
 545                     "changed",
 546                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 547                     scrolled_window);
 548   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 549
 550   if (bin->child)
 551     gtk_widget_set_scroll_adjustments (bin->child,
 552                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 553                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 554
 555   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 556 }
 557
 558 /**
 559  * gtk_scrolled_window_get_hadjustment:
 560  * @scrolled_window: a #GtkScrolledWindow
 561  *
 562  * Returns the horizontal scrollbar's adjustment, used to connect the
 563  * horizontal scrollbar to the child widget's horizontal scroll
 564  * functionality.
 565  *
 566  * Returns: the horizontal #GtkAdjustment
 567  */
 568 GtkAdjustment*
 569 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 570 {
 571   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 572
 573   return (scrolled_window->hscrollbar ?
 574           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 575           NULL);
 576 }
 577
 578 /**
 579  * gtk_scrolled_window_get_vadjustment:
 580  * @scrolled_window: a #GtkScrolledWindow
 581  *
 582  * Returns the vertical scrollbar's adjustment, used to connect the
 583  * vertical scrollbar to the child widget's vertical scroll
 584  * functionality.
 585  *
 586  * Returns: the vertical #GtkAdjustment
 587  */
 588 GtkAdjustment*
 589 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 590 {
 591   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 592
 593   return (scrolled_window->vscrollbar ?
 594           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 595           NULL);
 596 }
 597
 598 /**
 599  * gtk_scrolled_window_get_hscrollbar:
 600  * @scrolled_window: a #GtkScrolledWindow
 601  *
 602  * Returns the horizontal scrollbar of @scrolled_window.
 603  *
 604  * Returns: the horizontal scrollbar of the scrolled window, or
 605  *  %NULL if it does not have one.
 606  *
 607  * Since: 2.8
 608  */
 609 GtkWidget*
 610 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 611 {
 612   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 613
 614   return scrolled_window->hscrollbar;
 615 }
 616
 617 /**
 618  * gtk_scrolled_window_get_vscrollbar:
 619  * @scrolled_window: a #GtkScrolledWindow
 620  *
 621  * Returns the vertical scrollbar of @scrolled_window.
 622  *
 623  * Returns: the vertical scrollbar of the scrolled window, or
 624  *  %NULL if it does not have one.
 625  *
 626  * Since: 2.8
 627  */
 628 GtkWidget*
 629 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 630 {
 631   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 632
 633   return scrolled_window->vscrollbar;
 634 }
 635
 636 /**
 637  * gtk_scrolled_window_set_policy:
 638  * @scrolled_window: a #GtkScrolledWindow
 639  * @hscrollbar_policy: policy for horizontal bar
 640  * @vscrollbar_policy: policy for vertical bar
 641  *
 642  * Sets the scrollbar policy for the horizontal and vertical scrollbars.
 643  *
 644  * The policy determines when the scrollbar should appear; it is a value
 645  * from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
 646  * scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
 647  * never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
 648  * if needed (that is, if the slider part of the bar would be smaller
 649  * than the trough - the display is larger than the page size).
 650  */
 651 void
 652 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 653                                 GtkPolicyType      hscrollbar_policy,
 654                                 GtkPolicyType      vscrollbar_policy)
 655 {
 656   GObject *object = G_OBJECT (scrolled_window);
 657
 658   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 659
 660   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 661       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 662     {
 663       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 664       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 665
 666       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 667
 668       g_object_freeze_notify (object);
 669       g_object_notify (object, "hscrollbar-policy");
 670       g_object_notify (object, "vscrollbar-policy");
 671       g_object_thaw_notify (object);
 672     }
 673 }
 674
 675 /**
 676  * gtk_scrolled_window_get_policy:
 677  * @scrolled_window: a #GtkScrolledWindow
 678  * @hscrollbar_policy: location to store the policy for the horizontal
 679  *     scrollbar, or %NULL.
 680  * @vscrollbar_policy: location to store the policy for the vertical
 681  *     scrollbar, or %NULL.
 682  *
 683  * Retrieves the current policy values for the horizontal and vertical
 684  * scrollbars. See gtk_scrolled_window_set_policy().
 685  */
 686 void
 687 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 688                                 GtkPolicyType     *hscrollbar_policy,
 689                                 GtkPolicyType     *vscrollbar_policy)
 690 {
 691   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 692
 693   if (hscrollbar_policy)
 694     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 695   if (vscrollbar_policy)
 696     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 697 }
 698
 699 static void
 700 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 701 {
 702   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 703   GtkSettings *settings;
 704
 705   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 706
 707   if (priv->window_placement_set || settings == NULL)
 708     priv->real_window_placement = scrolled_window->window_placement;
 709   else
 710     g_object_get (settings,
 711                   "gtk-scrolled-window-placement",
 712                   &priv->real_window_placement,
 713                   NULL);
 714 }
 715
 716 static void
 717 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 718                                             GtkCornerType      window_placement)
 719 {
 720   if (scrolled_window->window_placement != window_placement)
 721     {
 722       scrolled_window->window_placement = window_placement;
 723
 724       gtk_scrolled_window_update_real_placement (scrolled_window);
 725       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 726
 727       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 728     }
 729 }
 730
 731 static void
 732 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 733                                        gboolean           placement_set,
 734                                        gboolean           emit_resize)
 735 {
 736   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 737
 738   if (priv->window_placement_set != placement_set)
 739     {
 740       priv->window_placement_set = placement_set;
 741
 742       gtk_scrolled_window_update_real_placement (scrolled_window);
 743       if (emit_resize)
 744         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 745
 746       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 747     }
 748 }
 749
 750 /**
 751  * gtk_scrolled_window_set_placement:
 752  * @scrolled_window: a #GtkScrolledWindow
 753  * @window_placement: position of the child window
 754  *
 755  * Sets the placement of the contents with respect to the scrollbars
 756  * for the scrolled window.
 757  *
 758  * The default is %GTK_CORNER_TOP_LEFT, meaning the child is
 759  * in the top left, with the scrollbars underneath and to the right.
 760  * Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
 761  * %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
 762  *
 763  * See also gtk_scrolled_window_get_placement() and
 764  * gtk_scrolled_window_unset_placement().
 765  */
 766 void
 767 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 768                                    GtkCornerType      window_placement)
 769 {
 770   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 771
 772   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 773   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 774 }
 775
 776 /**
 777  * gtk_scrolled_window_get_placement:
 778  * @scrolled_window: a #GtkScrolledWindow
 779  *
 780  * Gets the placement of the contents with respect to the scrollbars
 781  * for the scrolled window. See gtk_scrolled_window_set_placement().
 782  *
 783  * Return value: the current placement value.
 784  *
 785  * See also gtk_scrolled_window_set_placement() and
 786  * gtk_scrolled_window_unset_placement().
 787  **/
 788 GtkCornerType
 789 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 790 {
 791   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 792
 793   return scrolled_window->window_placement;
 794 }
 795
 796 /**
 797  * gtk_scrolled_window_unset_placement:
 798  * @scrolled_window: a #GtkScrolledWindow
 799  *
 800  * Unsets the placement of the contents with respect to the scrollbars
 801  * for the scrolled window. If no window placement is set for a scrolled
 802  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 803  *
 804  * See also gtk_scrolled_window_set_placement() and
 805  * gtk_scrolled_window_get_placement().
 806  *
 807  * Since: 2.10
 808  **/
 809 void
 810 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 811 {
 812   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 813
 814   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 815
 816   if (priv->window_placement_set)
 817     {
 818       priv->window_placement_set = FALSE;
 819
 820       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 821
 822       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 823     }
 824 }
 825
 826 /**
 827  * gtk_scrolled_window_set_shadow_type:
 828  * @scrolled_window: a #GtkScrolledWindow
 829  * @type: kind of shadow to draw around scrolled window contents
 830  *
 831  * Changes the type of shadow drawn around the contents of
 832  * @scrolled_window.
 833  *
 834  **/
 835 void
 836 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 837                                      GtkShadowType      type)
 838 {
 839   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 840   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 841
 842   if (scrolled_window->shadow_type != type)
 843     {
 844       scrolled_window->shadow_type = type;
 845
 846       if (gtk_widget_is_drawable (GTK_WIDGET (scrolled_window)))
 847         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 848
 849       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 850
 851       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 852     }
 853 }
 854
 855 /**
 856  * gtk_scrolled_window_get_shadow_type:
 857  * @scrolled_window: a #GtkScrolledWindow
 858  *
 859  * Gets the shadow type of the scrolled window. See
 860  * gtk_scrolled_window_set_shadow_type().
 861  *
 862  * Return value: the current shadow type
 863  **/
 864 GtkShadowType
 865 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 866 {
 867   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 868
 869   return scrolled_window->shadow_type;
 870 }
 871
 872 static void
 873 gtk_scrolled_window_destroy (GtkObject *object)
 874 {
 875   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 876
 877   if (scrolled_window->hscrollbar)
 878     {
 879       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 880                                             gtk_scrolled_window_adjustment_changed,
 881                                             scrolled_window);
 882       gtk_widget_unparent (scrolled_window->hscrollbar);
 883       gtk_widget_destroy (scrolled_window->hscrollbar);
 884       g_object_unref (scrolled_window->hscrollbar);
 885       scrolled_window->hscrollbar = NULL;
 886     }
 887   if (scrolled_window->vscrollbar)
 888     {
 889       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)),
 890                                             gtk_scrolled_window_adjustment_changed,
 891                                             scrolled_window);
 892       gtk_widget_unparent (scrolled_window->vscrollbar);
 893       gtk_widget_destroy (scrolled_window->vscrollbar);
 894       g_object_unref (scrolled_window->vscrollbar);
 895       scrolled_window->vscrollbar = NULL;
 896     }
 897
 898   GTK_OBJECT_CLASS (gtk_scrolled_window_parent_class)->destroy (object);
 899 }
 900
 901 static void
 902 gtk_scrolled_window_set_property (GObject      *object,
 903                                   guint         prop_id,
 904                                   const GValue *value,
 905                                   GParamSpec   *pspec)
 906 {
 907   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 908
 909   switch (prop_id)
 910     {
 911     case PROP_HADJUSTMENT:
 912       gtk_scrolled_window_set_hadjustment (scrolled_window,
 913                                            g_value_get_object (value));
 914       break;
 915     case PROP_VADJUSTMENT:
 916       gtk_scrolled_window_set_vadjustment (scrolled_window,
 917                                            g_value_get_object (value));
 918       break;
 919     case PROP_HSCROLLBAR_POLICY:
 920       gtk_scrolled_window_set_policy (scrolled_window,
 921                                       g_value_get_enum (value),
 922                                       scrolled_window->vscrollbar_policy);
 923       break;
 924     case PROP_VSCROLLBAR_POLICY:
 925       gtk_scrolled_window_set_policy (scrolled_window,
 926                                       scrolled_window->hscrollbar_policy,
 927                                       g_value_get_enum (value));
 928       break;
 929     case PROP_WINDOW_PLACEMENT:
 930       gtk_scrolled_window_set_placement_internal (scrolled_window,
 931                                                   g_value_get_enum (value));
 932       break;
 933     case PROP_WINDOW_PLACEMENT_SET:
 934       gtk_scrolled_window_set_placement_set (scrolled_window,
 935                                              g_value_get_boolean (value),
 936                                              TRUE);
 937       break;
 938     case PROP_SHADOW_TYPE:
 939       gtk_scrolled_window_set_shadow_type (scrolled_window,
 940                                            g_value_get_enum (value));
 941       break;
 942     default:
 943       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 944       break;
 945     }
 946 }
 947
 948 static void
 949 gtk_scrolled_window_get_property (GObject    *object,
 950                                   guint       prop_id,
 951                                   GValue     *value,
 952                                   GParamSpec *pspec)
 953 {
 954   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 955   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 956
 957   switch (prop_id)
 958     {
 959     case PROP_HADJUSTMENT:
 960       g_value_set_object (value,
 961                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 962       break;
 963     case PROP_VADJUSTMENT:
 964       g_value_set_object (value,
 965                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 966       break;
 967     case PROP_HSCROLLBAR_POLICY:
 968       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 969       break;
 970     case PROP_VSCROLLBAR_POLICY:
 971       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 972       break;
 973     case PROP_WINDOW_PLACEMENT:
 974       g_value_set_enum (value, scrolled_window->window_placement);
 975       break;
 976     case PROP_WINDOW_PLACEMENT_SET:
 977       g_value_set_boolean (value, priv->window_placement_set);
 978       break;
 979     case PROP_SHADOW_TYPE:
 980       g_value_set_enum (value, scrolled_window->shadow_type);
 981       break;
 982     default:
 983       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 984       break;
 985     }
 986 }
 987
 988 static void
 989 traverse_container (GtkWidget *widget,
 990                     gpointer   data)
 991 {
 992   if (GTK_IS_SCROLLED_WINDOW (widget))
 993     {
 994       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 995       gtk_widget_queue_resize (widget);
 996     }
 997   else if (GTK_IS_CONTAINER (widget))
 998     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
 999 }
1000
1001 static void
1002 gtk_scrolled_window_settings_changed (GtkSettings *settings)
1003 {
1004   GList *list, *l;
1005
1006   list = gtk_window_list_toplevels ();
1007
1008   for (l = list; l; l = l->next)
1009     gtk_container_forall (GTK_CONTAINER (l->data),
1010                           traverse_container, NULL);
1011
1012   g_list_free (list);
1013 }
1014
1015 static void
1016 gtk_scrolled_window_screen_changed (GtkWidget *widget,
1017                                     GdkScreen *previous_screen)
1018 {
1019   GtkSettings *settings;
1020   guint window_placement_connection;
1021
1022   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1023
1024   if (!gtk_widget_has_screen (widget))
1025     return;
1026
1027   settings = gtk_widget_get_settings (widget);
1028
1029   window_placement_connection =
1030     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
1031                                          "gtk-scrolled-window-connection"));
1032
1033   if (window_placement_connection)
1034     return;
1035
1036   window_placement_connection =
1037     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
1038                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
1039   g_object_set_data (G_OBJECT (settings),
1040                      I_("gtk-scrolled-window-connection"),
1041                      GUINT_TO_POINTER (window_placement_connection));
1042 }
1043
1044 static void
1045 gtk_scrolled_window_paint (GtkWidget    *widget,
1046                            GdkRectangle *area)
1047 {
1048   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1049
1050   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1051     {
1052       GtkAllocation relative_allocation;
1053       gboolean scrollbars_within_bevel;
1054
1055       gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1056
1057       if (!scrollbars_within_bevel)
1058         {
1059           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1060
1061           relative_allocation.x -= widget->style->xthickness;
1062           relative_allocation.y -= widget->style->ythickness;
1063           relative_allocation.width += 2 * widget->style->xthickness;
1064           relative_allocation.height += 2 * widget->style->ythickness;
1065         }
1066       else
1067         {
1068           GtkContainer *container = GTK_CONTAINER (widget);
1069
1070           relative_allocation.x = container->border_width;
1071           relative_allocation.y = container->border_width;
1072           relative_allocation.width = widget->allocation.width - 2 * container->border_width;
1073           relative_allocation.height = widget->allocation.height - 2 * container->border_width;
1074         }
1075
1076       gtk_paint_shadow (widget->style, widget->window,
1077                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
1078                         area, widget, "scrolled_window",
1079                         widget->allocation.x + relative_allocation.x,
1080                         widget->allocation.y + relative_allocation.y,
1081                         relative_allocation.width,
1082                         relative_allocation.height);
1083     }
1084 }
1085
1086 static gboolean
1087 gtk_scrolled_window_expose (GtkWidget      *widget,
1088                             GdkEventExpose *event)
1089 {
1090   if (gtk_widget_is_drawable (widget))
1091     {
1092       gtk_scrolled_window_paint (widget, &event->area);
1093
1094       GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->expose_event (widget, event);
1095     }
1096
1097   return FALSE;
1098 }
1099
1100 static void
1101 gtk_scrolled_window_forall (GtkContainer *container,
1102                             gboolean      include_internals,
1103                             GtkCallback   callback,
1104                             gpointer      callback_data)
1105 {
1106   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1107   g_return_if_fail (callback != NULL);
1108
1109   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
1110                                               include_internals,
1111                                               callback,
1112                                               callback_data);
1113   if (include_internals)
1114     {
1115       GtkScrolledWindow *scrolled_window;
1116
1117       scrolled_window = GTK_SCROLLED_WINDOW (container);
1118
1119       if (scrolled_window->vscrollbar)
1120         callback (scrolled_window->vscrollbar, callback_data);
1121       if (scrolled_window->hscrollbar)
1122         callback (scrolled_window->hscrollbar, callback_data);
1123     }
1124 }
1125
1126 static gboolean
1127 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1128                                   GtkScrollType      scroll,
1129                                   gboolean           horizontal)
1130 {
1131   GtkAdjustment *adjustment = NULL;
1132
1133   switch (scroll)
1134     {
1135     case GTK_SCROLL_STEP_UP:
1136       scroll = GTK_SCROLL_STEP_BACKWARD;
1137       horizontal = FALSE;
1138       break;
1139     case GTK_SCROLL_STEP_DOWN:
1140       scroll = GTK_SCROLL_STEP_FORWARD;
1141       horizontal = FALSE;
1142       break;
1143     case GTK_SCROLL_STEP_LEFT:
1144       scroll = GTK_SCROLL_STEP_BACKWARD;
1145       horizontal = TRUE;
1146       break;
1147     case GTK_SCROLL_STEP_RIGHT:
1148       scroll = GTK_SCROLL_STEP_FORWARD;
1149       horizontal = TRUE;
1150       break;
1151     case GTK_SCROLL_PAGE_UP:
1152       scroll = GTK_SCROLL_PAGE_BACKWARD;
1153       horizontal = FALSE;
1154       break;
1155     case GTK_SCROLL_PAGE_DOWN:
1156       scroll = GTK_SCROLL_PAGE_FORWARD;
1157       horizontal = FALSE;
1158       break;
1159     case GTK_SCROLL_PAGE_LEFT:
1160       scroll = GTK_SCROLL_STEP_BACKWARD;
1161       horizontal = TRUE;
1162       break;
1163     case GTK_SCROLL_PAGE_RIGHT:
1164       scroll = GTK_SCROLL_STEP_FORWARD;
1165       horizontal = TRUE;
1166       break;
1167     case GTK_SCROLL_STEP_BACKWARD:
1168     case GTK_SCROLL_STEP_FORWARD:
1169     case GTK_SCROLL_PAGE_BACKWARD:
1170     case GTK_SCROLL_PAGE_FORWARD:
1171     case GTK_SCROLL_START:
1172     case GTK_SCROLL_END:
1173       break;
1174     default:
1175       g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
1176       return FALSE;
1177     }
1178
1179   if ((horizontal && (!scrolled_window->hscrollbar || !scrolled_window->hscrollbar_visible)) ||
1180       (!horizontal && (!scrolled_window->vscrollbar || !scrolled_window->vscrollbar_visible)))
1181     return FALSE;
1182
1183   if (horizontal)
1184     {
1185       if (scrolled_window->hscrollbar)
1186         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
1187     }
1188   else
1189     {
1190       if (scrolled_window->vscrollbar)
1191         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
1192     }
1193
1194   if (adjustment)
1195     {
1196       gdouble value = adjustment->value;
1197
1198       switch (scroll)
1199         {
1200         case GTK_SCROLL_STEP_FORWARD:
1201           value += adjustment->step_increment;
1202           break;
1203         case GTK_SCROLL_STEP_BACKWARD:
1204           value -= adjustment->step_increment;
1205           break;
1206         case GTK_SCROLL_PAGE_FORWARD:
1207           value += adjustment->page_increment;
1208           break;
1209         case GTK_SCROLL_PAGE_BACKWARD:
1210           value -= adjustment->page_increment;
1211           break;
1212         case GTK_SCROLL_START:
1213           value = adjustment->lower;
1214           break;
1215         case GTK_SCROLL_END:
1216           value = adjustment->upper;
1217           break;
1218         default:
1219           g_assert_not_reached ();
1220           break;
1221         }
1222
1223       gtk_adjustment_set_value (adjustment, value);
1224
1225       return TRUE;
1226     }
1227
1228   return FALSE;
1229 }
1230
1231 static void
1232 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1233                                     GtkDirectionType   direction_type)
1234 {
1235   GtkWidget *toplevel;
1236
1237   /* Focus out of the scrolled window entirely. We do this by setting
1238    * a flag, then propagating the focus motion to the notebook.
1239    */
1240   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1241   if (!gtk_widget_is_toplevel (toplevel))
1242     return;
1243
1244   g_object_ref (scrolled_window);
1245
1246   scrolled_window->focus_out = TRUE;
1247   g_signal_emit_by_name (toplevel, "move-focus", direction_type);
1248   scrolled_window->focus_out = FALSE;
1249
1250   g_object_unref (scrolled_window);
1251 }
1252
1253 static void
1254 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1255                                          GtkAllocation *allocation)
1256 {
1257   GtkScrolledWindow *scrolled_window;
1258   GtkScrolledWindowPrivate *priv;
1259   gint scrollbar_spacing;
1260
1261   g_return_if_fail (widget != NULL);
1262   g_return_if_fail (allocation != NULL);
1263
1264   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1265   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1266
1267   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1268
1269   allocation->x = GTK_CONTAINER (widget)->border_width;
1270   allocation->y = GTK_CONTAINER (widget)->border_width;
1271
1272   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1273     {
1274       allocation->x += widget->style->xthickness;
1275       allocation->y += widget->style->ythickness;
1276     }
1277
1278   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1279   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1280
1281   if (scrolled_window->vscrollbar_visible)
1282     {
1283       GtkRequisition vscrollbar_requisition;
1284       gboolean is_rtl;
1285
1286       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1287                                         &vscrollbar_requisition);
1288       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1289
1290       if ((!is_rtl &&
1291            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1292             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1293           (is_rtl &&
1294            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1295             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1296         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1297
1298       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1299     }
1300   if (scrolled_window->hscrollbar_visible)
1301     {
1302       GtkRequisition hscrollbar_requisition;
1303       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1304                                         &hscrollbar_requisition);
1305
1306       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1307           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1308         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1309
1310       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1311     }
1312 }
1313
1314 static void
1315 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1316                                    GtkAllocation *allocation)
1317 {
1318   GtkScrolledWindow *scrolled_window;
1319   GtkScrolledWindowPrivate *priv;
1320   GtkBin *bin;
1321   GtkAllocation relative_allocation;
1322   GtkAllocation child_allocation;
1323   gboolean scrollbars_within_bevel;
1324   gint scrollbar_spacing;
1325
1326   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1327   g_return_if_fail (allocation != NULL);
1328
1329   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1330   bin = GTK_BIN (scrolled_window);
1331
1332   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1333   gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1334
1335   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1336
1337   widget->allocation = *allocation;
1338
1339   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1340     scrolled_window->hscrollbar_visible = TRUE;
1341   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1342     scrolled_window->hscrollbar_visible = FALSE;
1343   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1344     scrolled_window->vscrollbar_visible = TRUE;
1345   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1346     scrolled_window->vscrollbar_visible = FALSE;
1347
1348   if (bin->child && gtk_widget_get_visible (bin->child))
1349     {
1350       gboolean previous_hvis;
1351       gboolean previous_vvis;
1352       guint count = 0;
1353
1354       do
1355         {
1356           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1357
1358           child_allocation.x = relative_allocation.x + allocation->x;
1359           child_allocation.y = relative_allocation.y + allocation->y;
1360           child_allocation.width = relative_allocation.width;
1361           child_allocation.height = relative_allocation.height;
1362
1363           previous_hvis = scrolled_window->hscrollbar_visible;
1364           previous_vvis = scrolled_window->vscrollbar_visible;
1365
1366           gtk_widget_size_allocate (bin->child, &child_allocation);
1367
1368           /* If, after the first iteration, the hscrollbar and the
1369            * vscrollbar flip visiblity, then we need both.
1370            */
1371           if (count &&
1372               previous_hvis != scrolled_window->hscrollbar_visible &&
1373               previous_vvis != scrolled_window->vscrollbar_visible)
1374             {
1375               scrolled_window->hscrollbar_visible = TRUE;
1376               scrolled_window->vscrollbar_visible = TRUE;
1377
1378               /* a new resize is already queued at this point,
1379                * so we will immediatedly get reinvoked
1380                */
1381               return;
1382             }
1383
1384           count++;
1385         }
1386       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1387              previous_vvis != scrolled_window->vscrollbar_visible);
1388     }
1389   else
1390     {
1391       scrolled_window->hscrollbar_visible = scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS;
1392       scrolled_window->vscrollbar_visible = scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS;
1393       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1394     }
1395
1396   if (scrolled_window->hscrollbar_visible)
1397     {
1398       GtkRequisition hscrollbar_requisition;
1399       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1400                                         &hscrollbar_requisition);
1401
1402       if (!gtk_widget_get_visible (scrolled_window->hscrollbar))
1403         gtk_widget_show (scrolled_window->hscrollbar);
1404
1405       child_allocation.x = relative_allocation.x;
1406       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1407           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1408         child_allocation.y = (relative_allocation.y +
1409                               relative_allocation.height +
1410                               scrollbar_spacing +
1411                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1412                                0 : widget->style->ythickness));
1413       else
1414         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1415
1416       child_allocation.width = relative_allocation.width;
1417       child_allocation.height = hscrollbar_requisition.height;
1418       child_allocation.x += allocation->x;
1419       child_allocation.y += allocation->y;
1420
1421       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1422         {
1423           if (!scrollbars_within_bevel)
1424             {
1425               child_allocation.x -= widget->style->xthickness;
1426               child_allocation.width += 2 * widget->style->xthickness;
1427             }
1428           else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
1429                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1430             {
1431               child_allocation.y -= widget->style->ythickness;
1432             }
1433           else
1434             {
1435               child_allocation.y += widget->style->ythickness;
1436             }
1437         }
1438
1439       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1440     }
1441   else if (gtk_widget_get_visible (scrolled_window->hscrollbar))
1442     gtk_widget_hide (scrolled_window->hscrollbar);
1443
1444   if (scrolled_window->vscrollbar_visible)
1445     {
1446       GtkRequisition vscrollbar_requisition;
1447       if (!gtk_widget_get_visible (scrolled_window->vscrollbar))
1448         gtk_widget_show (scrolled_window->vscrollbar);
1449
1450       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1451                                         &vscrollbar_requisition);
1452
1453       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1454            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1455             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1456           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1457            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1458             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1459         child_allocation.x = (relative_allocation.x +
1460                               relative_allocation.width +
1461                               scrollbar_spacing +
1462                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1463                                0 : widget->style->xthickness));
1464       else
1465         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1466
1467       child_allocation.y = relative_allocation.y;
1468       child_allocation.width = vscrollbar_requisition.width;
1469       child_allocation.height = relative_allocation.height;
1470       child_allocation.x += allocation->x;
1471       child_allocation.y += allocation->y;
1472
1473       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1474         {
1475           if (!scrollbars_within_bevel)
1476             {
1477               child_allocation.y -= widget->style->ythickness;
1478               child_allocation.height += 2 * widget->style->ythickness;
1479             }
1480           else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
1481                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1482             {
1483               child_allocation.x -= widget->style->xthickness;
1484             }
1485           else
1486             {
1487               child_allocation.x += widget->style->xthickness;
1488             }
1489         }
1490
1491       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1492     }
1493   else if (gtk_widget_get_visible (scrolled_window->vscrollbar))
1494     gtk_widget_hide (scrolled_window->vscrollbar);
1495 }
1496
1497 static gboolean
1498 gtk_scrolled_window_scroll_event (GtkWidget      *widget,
1499                                   GdkEventScroll *event)
1500 {
1501   GtkWidget *range;
1502
1503   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1504   g_return_val_if_fail (event != NULL, FALSE);
1505
1506   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1507     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1508   else
1509     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1510
1511   if (range && gtk_widget_get_visible (range))
1512     {
1513       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1514       gdouble delta;
1515
1516       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1517
1518       gtk_adjustment_set_value (adj, adj->value + delta);
1519
1520       return TRUE;
1521     }
1522
1523   return FALSE;
1524 }
1525
1526 static gboolean
1527 gtk_scrolled_window_focus (GtkWidget        *widget,
1528                            GtkDirectionType  direction)
1529 {
1530   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1531   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1532
1533   if (scrolled_window->focus_out)
1534     {
1535       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1536       return FALSE;
1537     }
1538
1539   if (gtk_widget_is_focus (widget))
1540     return FALSE;
1541
1542   /* We only put the scrolled window itself in the focus chain if it
1543    * isn't possible to focus any children.
1544    */
1545   if (GTK_BIN (widget)->child)
1546     {
1547       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1548         return TRUE;
1549     }
1550
1551   if (!had_focus_child && gtk_widget_get_can_focus (widget))
1552     {
1553       gtk_widget_grab_focus (widget);
1554       return TRUE;
1555     }
1556   else
1557     return FALSE;
1558 }
1559
1560 static void
1561 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1562                                         gpointer       data)
1563 {
1564   GtkScrolledWindow *scrolled_win;
1565
1566   g_return_if_fail (adjustment != NULL);
1567   g_return_if_fail (data != NULL);
1568
1569   scrolled_win = GTK_SCROLLED_WINDOW (data);
1570
1571   if (scrolled_win->hscrollbar &&
1572       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1573     {
1574       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1575         {
1576           gboolean visible;
1577
1578           visible = scrolled_win->hscrollbar_visible;
1579           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1580                                               adjustment->page_size);
1581           if (scrolled_win->hscrollbar_visible != visible)
1582             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1583         }
1584     }
1585   else if (scrolled_win->vscrollbar &&
1586            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1587     {
1588       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1589         {
1590           gboolean visible;
1591
1592           visible = scrolled_win->vscrollbar_visible;
1593           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1594                                               adjustment->page_size);
1595           if (scrolled_win->vscrollbar_visible != visible)
1596             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1597         }
1598     }
1599 }
1600
1601 static void
1602 gtk_scrolled_window_add (GtkContainer *container,
1603                          GtkWidget    *child)
1604 {
1605   GtkScrolledWindow *scrolled_window;
1606   GtkBin *bin;
1607
1608   bin = GTK_BIN (container);
1609   g_return_if_fail (bin->child == NULL);
1610
1611   scrolled_window = GTK_SCROLLED_WINDOW (container);
1612
1613   bin->child = child;
1614   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1615
1616   /* this is a temporary message */
1617   if (!gtk_widget_set_scroll_adjustments (child,
1618                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1619                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1620     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1621                "use gtk_scrolled_window_add_with_viewport() instead");
1622 }
1623
1624 static void
1625 gtk_scrolled_window_remove (GtkContainer *container,
1626                             GtkWidget    *child)
1627 {
1628   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1629   g_return_if_fail (child != NULL);
1630   g_return_if_fail (GTK_BIN (container)->child == child);
1631
1632   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1633
1634   /* chain parent class handler to remove child */
1635   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1636 }
1637
1638 /**
1639  * gtk_scrolled_window_add_with_viewport:
1640  * @scrolled_window: a #GtkScrolledWindow
1641  * @child: the widget you want to scroll
1642  *
1643  * Used to add children without native scrolling capabilities. This
1644  * is simply a convenience function; it is equivalent to adding the
1645  * unscrollable child to a viewport, then adding the viewport to the
1646  * scrolled window. If a child has native scrolling, use
1647  * gtk_container_add() instead of this function.
1648  *
1649  * The viewport scrolls the child by moving its #GdkWindow, and takes
1650  * the size of the child to be the size of its toplevel #GdkWindow.
1651  * This will be very wrong for most widgets that support native scrolling;
1652  * for example, if you add a widget such as #GtkTreeView with a viewport,
1653  * the whole widget will scroll, including the column headings. Thus,
1654  * widgets with native scrolling support should not be used with the
1655  * #GtkViewport proxy.
1656  *
1657  * A widget supports scrolling natively if the
1658  * set_scroll_adjustments_signal field in #GtkWidgetClass is non-zero,
1659  * i.e. has been filled in with a valid signal identifier.
1660  */
1661 void
1662 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1663                                        GtkWidget         *child)
1664 {
1665   GtkBin *bin;
1666   GtkWidget *viewport;
1667
1668   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1669   g_return_if_fail (GTK_IS_WIDGET (child));
1670   g_return_if_fail (child->parent == NULL);
1671
1672   bin = GTK_BIN (scrolled_window);
1673
1674   if (bin->child != NULL)
1675     {
1676       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1677       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1678
1679       viewport = bin->child;
1680     }
1681   else
1682     {
1683       viewport =
1684         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1685                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1686       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1687     }
1688
1689   gtk_widget_show (viewport);
1690   gtk_container_add (GTK_CONTAINER (viewport), child);
1691 }
1692
1693 /*
1694  * _gtk_scrolled_window_get_spacing:
1695  * @scrolled_window: a scrolled window
1696  *
1697  * Gets the spacing between the scrolled window's scrollbars and
1698  * the scrolled widget. Used by GtkCombo
1699  *
1700  * Return value: the spacing, in pixels.
1701  */
1702 gint
1703 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1704 {
1705   GtkScrolledWindowClass *class;
1706
1707   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1708
1709   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1710
1711   if (class->scrollbar_spacing >= 0)
1712     return class->scrollbar_spacing;
1713   else
1714     {
1715       gint scrollbar_spacing;
1716
1717       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1718                             "scrollbar-spacing", &scrollbar_spacing,
1719                             NULL);
1720
1721       return scrollbar_spacing;
1722     }
1723 }
1724
1725
1726 static void
1727 gtk_scrolled_window_extended_layout_init (GtkExtendedLayoutIface *iface)
1728 {
1729   iface->get_desired_width    = gtk_scrolled_window_get_desired_width;
1730   iface->get_desired_height   = gtk_scrolled_window_get_desired_height;
1731   iface->get_height_for_width = gtk_scrolled_window_get_height_for_width;
1732   iface->get_width_for_height = gtk_scrolled_window_get_width_for_height;
1733 }
1734
1735 static void
1736 gtk_scrolled_window_get_desired_size (GtkExtendedLayout *layout,
1737                                       GtkOrientation     orientation,
1738                                       gint              *minimum_size,
1739                                       gint              *natural_size)
1740 {
1741   GtkScrolledWindow *scrolled_window;
1742   GtkBin *bin;
1743   gint extra_width;
1744   gint extra_height;
1745   gint scrollbar_spacing;
1746   GtkRequisition hscrollbar_requisition;
1747   GtkRequisition vscrollbar_requisition;
1748   GtkRequisition minimum_req, natural_req;
1749   gint min_child_size, nat_child_size;
1750
1751   scrolled_window = GTK_SCROLLED_WINDOW (layout);
1752   bin = GTK_BIN (scrolled_window);
1753
1754   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1755
1756   extra_width = 0;
1757   extra_height = 0;
1758   minimum_req.width = 0;
1759   minimum_req.height = 0;
1760   natural_req.width = 0;
1761   natural_req.height = 0;
1762
1763   gtk_widget_size_request (scrolled_window->hscrollbar,
1764                            &hscrollbar_requisition);
1765   gtk_widget_size_request (scrolled_window->vscrollbar,
1766                            &vscrollbar_requisition);
1767
1768   if (bin->child && gtk_widget_get_visible (bin->child))
1769     {
1770       if (orientation == GTK_ORIENTATION_HORIZONTAL)
1771         {
1772           gtk_extended_layout_get_desired_width (GTK_EXTENDED_LAYOUT (bin->child),
1773                                                  &min_child_size,
1774                                                  &nat_child_size);
1775
1776           if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1777             {
1778               minimum_req.width += min_child_size;
1779               natural_req.width += nat_child_size;
1780             }
1781           else
1782             {
1783               GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1784
1785               if (aux_info && aux_info->width > 0)
1786                 {
1787                   minimum_req.width += aux_info->width;
1788                   natural_req.width += aux_info->width;
1789                   extra_width = -1;
1790                 }
1791               else
1792                 {
1793                   minimum_req.width += vscrollbar_requisition.width;
1794                   natural_req.width += vscrollbar_requisition.width;
1795                 }
1796             }
1797         }
1798       else /* GTK_ORIENTATION_VERTICAL */
1799         {
1800           gtk_extended_layout_get_desired_height (GTK_EXTENDED_LAYOUT (bin->child),
1801                                                   &min_child_size,
1802                                                   &nat_child_size);
1803
1804           if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1805             {
1806               minimum_req.height += min_child_size;
1807               natural_req.height += nat_child_size;
1808             }
1809           else
1810             {
1811               GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1812
1813               if (aux_info && aux_info->height > 0)
1814                 {
1815                   minimum_req.height += aux_info->height;
1816                   natural_req.height += aux_info->height;
1817                   extra_height = -1;
1818                 }
1819               else
1820                 {
1821                   minimum_req.height += hscrollbar_requisition.height;
1822                   natural_req.height += hscrollbar_requisition.height;
1823                 }
1824             }
1825         }
1826     }
1827
1828   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1829       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1830     {
1831       minimum_req.width = MAX (minimum_req.width, hscrollbar_requisition.width);
1832       natural_req.width = MAX (natural_req.width, hscrollbar_requisition.width);
1833       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1834         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1835     }
1836
1837   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1838       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1839     {
1840       minimum_req.height = MAX (minimum_req.height, vscrollbar_requisition.height);
1841       natural_req.height = MAX (natural_req.height, vscrollbar_requisition.height);
1842       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1843         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1844     }
1845
1846   minimum_req.width += GTK_CONTAINER (layout)->border_width * 2 + MAX (0, extra_width);
1847   minimum_req.height += GTK_CONTAINER (layout)->border_width * 2 + MAX (0, extra_height);
1848   natural_req.width += GTK_CONTAINER (layout)->border_width * 2 + MAX (0, extra_width);
1849   natural_req.height += GTK_CONTAINER (layout)->border_width * 2 + MAX (0, extra_height);
1850
1851   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1852     {
1853       minimum_req.width += 2 * GTK_WIDGET (layout)->style->xthickness;
1854       minimum_req.height += 2 * GTK_WIDGET (layout)->style->ythickness;
1855       natural_req.width += 2 * GTK_WIDGET (layout)->style->xthickness;
1856       natural_req.height += 2 * GTK_WIDGET (layout)->style->ythickness;
1857     }
1858
1859   if (orientation == GTK_ORIENTATION_HORIZONTAL)
1860     {
1861       if (minimum_size)
1862         *minimum_size = minimum_req.width;
1863       if (natural_size)
1864         *natural_size = natural_req.width;
1865     }
1866   else
1867     {
1868       if (minimum_size)
1869         *minimum_size = minimum_req.height;
1870       if (natural_size)
1871         *natural_size = natural_req.height;
1872     }
1873 }
1874
1875 static void
1876 gtk_scrolled_window_get_desired_width (GtkExtendedLayout      *layout,
1877                                        gint                   *minimum_size,
1878                                        gint                   *natural_size)
1879 {
1880   gtk_scrolled_window_get_desired_size (layout, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
1881 }
1882
1883 static void
1884 gtk_scrolled_window_get_desired_height (GtkExtendedLayout      *layout,
1885                                         gint                   *minimum_size,
1886                                         gint                   *natural_size)
1887 {
1888   gtk_scrolled_window_get_desired_size (layout, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
1889 }
1890
1891 static void
1892 gtk_scrolled_window_get_height_for_width (GtkExtendedLayout *layout,
1893                                           gint       width,
1894                                           gint      *minimum_height,
1895                                           gint      *natural_height)
1896 {
1897   g_return_if_fail (GTK_IS_WIDGET (layout));
1898
1899   GTK_EXTENDED_LAYOUT_GET_IFACE (layout)->get_desired_height (layout, minimum_height, natural_height);
1900 }
1901
1902 static void
1903 gtk_scrolled_window_get_width_for_height (GtkExtendedLayout *layout,
1904                                           gint       height,
1905                                           gint      *minimum_width,
1906                                           gint      *natural_width)
1907 {
1908   g_return_if_fail (GTK_IS_WIDGET (layout));
1909
1910   GTK_EXTENDED_LAYOUT_GET_IFACE (layout)->get_desired_width (layout, minimum_width, natural_width);
1911 }
1912
1913 #define __GTK_SCROLLED_WINDOW_C__
1914 #include "gtkaliasdef.c"