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 <gdk/gdkkeysyms.h>
  28 #include "gtkbindings.h"
  29 #include "gtkmarshalers.h"
  30 #include "gtkscrolledwindow.h"
  31 #include "gtkintl.h"
  32
  33
  34 /* scrolled window policy and size requisition handling:
  35  *
  36  * gtk size requisition works as follows:
  37  *   a widget upon size-request reports the width and height that it finds
  38  *   to be best suited to display its contents, including children.
  39  *   the width and/or height reported from a widget upon size requisition
  40  *   may be overidden by the user by specifying a width and/or height
  41  *   other than 0 through gtk_widget_set_usize().
  42  *
  43  * a scrolled window needs (for imlementing all three policy types) to
  44  * request its width and height based on two different rationales.
  45  * 1)   the user wants the scrolled window to just fit into the space
  46  *      that it gets allocated for a specifc dimension.
  47  * 1.1) this does not apply if the user specified a concrete value
  48  *      value for that specific dimension by either specifying usize for the
  49  *      scrolled window or for its child.
  50  * 2)   the user wants the scrolled window to take as much space up as
  51  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
  52  *
  53  * also, kinda obvious:
  54  * 3)   a user would certainly not have choosen a scrolled window as a container
  55  *      for the child, if the resulting allocation takes up more space than the
  56  *      child would have allocated without the scrolled window.
  57  *
  58  * conclusions:
  59  * A) from 1) follows: the scrolled window shouldn't request more space for a
  60  *    specifc dimension than is required at minimum.
  61  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
  62  *    window (done automatically) or by usize of the child (needs to be checked).
  63  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
  64  *    child's dimension.
  65  * D) from 3) follows: the scrolled window child's minimum width and minimum height
  66  *    under A) at least correspond to the space taken up by its scrollbars.
  67  */
  68
  69 #define DEFAULT_SCROLLBAR_SPACING  3
  70
  71 enum {
  72   PROP_0,
  73   PROP_HADJUSTMENT,
  74   PROP_VADJUSTMENT,
  75   PROP_HSCROLLBAR_POLICY,
  76   PROP_VSCROLLBAR_POLICY,
  77   PROP_WINDOW_PLACEMENT,
  78   PROP_SHADOW_TYPE,
  79   PROP_LAST
  80 };
  81
  82 /* Signals */
  83 enum
  84 {
  85   SCROLL_CHILD,
  86   MOVE_FOCUS_OUT,
  87   LAST_SIGNAL
  88 };
  89
  90 static void gtk_scrolled_window_class_init         (GtkScrolledWindowClass *klass);
  91 static void gtk_scrolled_window_init               (GtkScrolledWindow      *scrolled_window);
  92 static void gtk_scrolled_window_destroy            (GtkObject              *object);
  93 static void gtk_scrolled_window_finalize           (GObject                *object);
  94 static void gtk_scrolled_window_set_property       (GObject                *object,
  95                                                     guint                   prop_id,
  96                                                     const GValue           *value,
  97                                                     GParamSpec             *pspec);
  98 static void gtk_scrolled_window_get_property       (GObject                *object,
  99                                                     guint                   prop_id,
 100                                                     GValue                 *value,
 101                                                     GParamSpec             *pspec);
 102
 103 static gint gtk_scrolled_window_expose             (GtkWidget              *widget,
 104                                                     GdkEventExpose         *event);
 105 static void gtk_scrolled_window_size_request       (GtkWidget              *widget,
 106                                                     GtkRequisition         *requisition);
 107 static void gtk_scrolled_window_size_allocate      (GtkWidget              *widget,
 108                                                     GtkAllocation          *allocation);
 109 static gint gtk_scrolled_window_scroll_event       (GtkWidget              *widget,
 110                                                     GdkEventScroll         *event);
 111 static gint gtk_scrolled_window_focus              (GtkWidget              *widget,
 112                                                     GtkDirectionType        direction);
 113 static void gtk_scrolled_window_add                (GtkContainer           *container,
 114                                                     GtkWidget              *widget);
 115 static void gtk_scrolled_window_remove             (GtkContainer           *container,
 116                                                     GtkWidget              *widget);
 117 static void gtk_scrolled_window_forall             (GtkContainer           *container,
 118                                                     gboolean                include_internals,
 119                                                     GtkCallback             callback,
 120                                                     gpointer                callback_data);
 121 static void gtk_scrolled_window_scroll_child       (GtkScrolledWindow      *scrolled_window,
 122                                                     GtkScrollType           scroll,
 123                                                     gboolean                horizontal);
 124 static void gtk_scrolled_window_move_focus_out     (GtkScrolledWindow      *scrolled_window,
 125                                                     GtkDirectionType        direction_type);
 126
 127 static void gtk_scrolled_window_relative_allocation(GtkWidget              *widget,
 128                                                     GtkAllocation          *allocation);
 129 static void gtk_scrolled_window_adjustment_changed (GtkAdjustment          *adjustment,
 130                                                     gpointer                data);
 131
 132 static GtkContainerClass *parent_class = NULL;
 133
 134 static guint signals[LAST_SIGNAL] = {0};
 135
 136 GType
 137 gtk_scrolled_window_get_type (void)
 138 {
 139   static GType scrolled_window_type = 0;
 140
 141   if (!scrolled_window_type)
 142     {
 143       static const GTypeInfo scrolled_window_info =
 144       {
 145         sizeof (GtkScrolledWindowClass),
 146         NULL,           /* base_init */
 147         NULL,           /* base_finalize */
 148         (GClassInitFunc) gtk_scrolled_window_class_init,
 149         NULL,           /* class_finalize */
 150         NULL,           /* class_data */
 151         sizeof (GtkScrolledWindow),
 152         0,              /* n_preallocs */
 153         (GInstanceInitFunc) gtk_scrolled_window_init,
 154       };
 155
 156       scrolled_window_type =
 157         g_type_register_static (GTK_TYPE_BIN, "GtkScrolledWindow",
 158                                 &scrolled_window_info, 0);
 159     }
 160
 161   return scrolled_window_type;
 162 }
 163
 164 static void
 165 add_scroll_binding (GtkBindingSet  *binding_set,
 166                     guint           keyval,
 167                     GdkModifierType mask,
 168                     GtkScrollType   scroll,
 169                     gboolean        horizontal)
 170 {
 171   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 172
 173   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 174                                 "scroll_child", 2,
 175                                 GTK_TYPE_SCROLL_TYPE, scroll,
 176                                 G_TYPE_BOOLEAN, horizontal);
 177   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 178                                 "scroll_child", 2,
 179                                 GTK_TYPE_SCROLL_TYPE, scroll,
 180                                 G_TYPE_BOOLEAN, horizontal);
 181 }
 182
 183 static void
 184 add_tab_bindings (GtkBindingSet    *binding_set,
 185                   GdkModifierType   modifiers,
 186                   GtkDirectionType  direction)
 187 {
 188   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 189                                 "move_focus_out", 1,
 190                                 GTK_TYPE_DIRECTION_TYPE, direction);
 191   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 192                                 "move_focus_out", 1,
 193                                 GTK_TYPE_DIRECTION_TYPE, direction);
 194 }
 195
 196 static void
 197 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 198 {
 199   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 200   GtkObjectClass *object_class;
 201   GtkWidgetClass *widget_class;
 202   GtkContainerClass *container_class;
 203   GtkBindingSet *binding_set;
 204
 205   object_class = (GtkObjectClass*) class;
 206   widget_class = (GtkWidgetClass*) class;
 207   container_class = (GtkContainerClass*) class;
 208
 209   parent_class = g_type_class_peek_parent (class);
 210
 211   gobject_class->finalize = gtk_scrolled_window_finalize;
 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->expose_event = gtk_scrolled_window_expose;
 218   widget_class->size_request = gtk_scrolled_window_size_request;
 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                                                         _("Horizontal Adjustment"),
 236                                                         _("The GtkAdjustment for the horizontal position"),
 237                                                         GTK_TYPE_ADJUSTMENT,
 238                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 239   g_object_class_install_property (gobject_class,
 240                                    PROP_VADJUSTMENT,
 241                                    g_param_spec_object ("vadjustment",
 242                                                         _("Vertical Adjustment"),
 243                                                         _("The GtkAdjustment for the vertical position"),
 244                                                         GTK_TYPE_ADJUSTMENT,
 245                                                         G_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                                                       _("Horizontal Scrollbar Policy"),
 250                                                       _("When the horizontal scrollbar is displayed"),
 251                                                       GTK_TYPE_POLICY_TYPE,
 252                                                       GTK_POLICY_ALWAYS,
 253                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 254   g_object_class_install_property (gobject_class,
 255                                    PROP_VSCROLLBAR_POLICY,
 256                                    g_param_spec_enum ("vscrollbar_policy",
 257                                                       _("Vertical Scrollbar Policy"),
 258                                                       _("When the vertical scrollbar is displayed"),
 259                                                       GTK_TYPE_POLICY_TYPE,
 260                                                       GTK_POLICY_ALWAYS,
 261                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 262
 263   g_object_class_install_property (gobject_class,
 264                                    PROP_WINDOW_PLACEMENT,
 265                                    g_param_spec_enum ("window_placement",
 266                                                       _("Window Placement"),
 267                                                       _("Where the contents are located with respect to the scrollbars"),
 268                                                       GTK_TYPE_CORNER_TYPE,
 269                                                       GTK_CORNER_TOP_LEFT,
 270                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 271   g_object_class_install_property (gobject_class,
 272                                    PROP_SHADOW_TYPE,
 273                                    g_param_spec_enum ("shadow_type",
 274                                                       _("Shadow Type"),
 275                                                       _("Style of bevel around the contents"),
 276                                                       GTK_TYPE_SHADOW_TYPE,
 277                                                       GTK_SHADOW_NONE,
 278                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 279
 280   gtk_widget_class_install_style_property (widget_class,
 281                                            g_param_spec_int ("scrollbar_spacing",
 282                                                              _("Scrollbar spacing"),
 283                                                              _("Number of pixels between the scrollbars and the scrolled window"),
 284                                                              0,
 285                                                              G_MAXINT,
 286                                                              DEFAULT_SCROLLBAR_SPACING,
 287                                                              G_PARAM_READABLE));
 288
 289   signals[SCROLL_CHILD] =
 290     g_signal_new ("scroll_child",
 291                   G_TYPE_FROM_CLASS (object_class),
 292                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 293                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 294                   NULL, NULL,
 295                   _gtk_marshal_VOID__ENUM_BOOLEAN,
 296                   G_TYPE_NONE, 2,
 297                   GTK_TYPE_SCROLL_TYPE,
 298                   G_TYPE_BOOLEAN);
 299   signals[MOVE_FOCUS_OUT] =
 300     g_signal_new ("move_focus_out",
 301                   G_TYPE_FROM_CLASS (object_class),
 302                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 303                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 304                   NULL, NULL,
 305                   _gtk_marshal_VOID__ENUM,
 306                   G_TYPE_NONE, 1,
 307                   GTK_TYPE_DIRECTION_TYPE);
 308
 309   binding_set = gtk_binding_set_by_class (class);
 310
 311   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 312   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 313   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 314   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 315
 316   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 317   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 318   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 319   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 320
 321   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 322   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 323   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 324   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 325
 326   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 327   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 328 }
 329
 330 static void
 331 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 332 {
 333   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 334
 335   scrolled_window->hscrollbar = NULL;
 336   scrolled_window->vscrollbar = NULL;
 337   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 338   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 339   scrolled_window->hscrollbar_visible = FALSE;
 340   scrolled_window->vscrollbar_visible = FALSE;
 341   scrolled_window->focus_out = FALSE;
 342   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 343
 344 }
 345
 346 GtkWidget*
 347 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 348                          GtkAdjustment *vadjustment)
 349 {
 350   GtkWidget *scrolled_window;
 351
 352   if (hadjustment)
 353     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 354
 355   if (vadjustment)
 356     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 357
 358   scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
 359                                     "hadjustment", hadjustment,
 360                                     "vadjustment", vadjustment,
 361                                     NULL);
 362
 363   return scrolled_window;
 364 }
 365
 366 void
 367 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 368                                      GtkAdjustment     *hadjustment)
 369 {
 370   GtkBin *bin;
 371
 372   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 373   if (hadjustment)
 374     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 375   else
 376     hadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 377
 378   bin = GTK_BIN (scrolled_window);
 379
 380   if (!scrolled_window->hscrollbar)
 381     {
 382       gtk_widget_push_composite_child ();
 383       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 384       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 385       gtk_widget_pop_composite_child ();
 386
 387       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 388       g_object_ref (scrolled_window->hscrollbar);
 389       gtk_widget_show (scrolled_window->hscrollbar);
 390     }
 391   else
 392     {
 393       GtkAdjustment *old_adjustment;
 394
 395       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 396       if (old_adjustment == hadjustment)
 397         return;
 398
 399       g_signal_handlers_disconnect_by_func (old_adjustment,
 400                                             gtk_scrolled_window_adjustment_changed,
 401                                             scrolled_window);
 402       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 403                                 hadjustment);
 404     }
 405   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 406   g_signal_connect (hadjustment,
 407                     "changed",
 408                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 409                     scrolled_window);
 410   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 411
 412   if (bin->child)
 413     gtk_widget_set_scroll_adjustments (bin->child,
 414                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 415                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 416
 417   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 418 }
 419
 420 void
 421 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 422                                      GtkAdjustment     *vadjustment)
 423 {
 424   GtkBin *bin;
 425
 426   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 427   if (vadjustment)
 428     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 429   else
 430     vadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 431
 432   bin = GTK_BIN (scrolled_window);
 433
 434   if (!scrolled_window->vscrollbar)
 435     {
 436       gtk_widget_push_composite_child ();
 437       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 438       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 439       gtk_widget_pop_composite_child ();
 440
 441       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 442       g_object_ref (scrolled_window->vscrollbar);
 443       gtk_widget_show (scrolled_window->vscrollbar);
 444     }
 445   else
 446     {
 447       GtkAdjustment *old_adjustment;
 448
 449       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 450       if (old_adjustment == vadjustment)
 451         return;
 452
 453       g_signal_handlers_disconnect_by_func (old_adjustment,
 454                                             gtk_scrolled_window_adjustment_changed,
 455                                             scrolled_window);
 456       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 457                                 vadjustment);
 458     }
 459   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 460   g_signal_connect (vadjustment,
 461                     "changed",
 462                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 463                     scrolled_window);
 464   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 465
 466   if (bin->child)
 467     gtk_widget_set_scroll_adjustments (bin->child,
 468                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 469                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 470
 471   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 472 }
 473
 474 GtkAdjustment*
 475 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 476 {
 477   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 478
 479   return (scrolled_window->hscrollbar ?
 480           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 481           NULL);
 482 }
 483
 484 GtkAdjustment*
 485 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 486 {
 487   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 488
 489   return (scrolled_window->vscrollbar ?
 490           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 491           NULL);
 492 }
 493
 494 void
 495 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 496                                 GtkPolicyType      hscrollbar_policy,
 497                                 GtkPolicyType      vscrollbar_policy)
 498 {
 499   GObject *object = G_OBJECT (scrolled_window);
 500
 501   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 502
 503   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 504       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 505     {
 506       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 507       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 508
 509       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 510
 511       g_object_freeze_notify (object);
 512       g_object_notify (object, "hscrollbar_policy");
 513       g_object_notify (object, "vscrollbar_policy");
 514       g_object_thaw_notify (object);
 515     }
 516 }
 517
 518 /**
 519  * gtk_scrolled_window_get_policy:
 520  * @scrolled_window: a #GtkScrolledWindow
 521  * @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 522  * @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 523  *
 524  * Retrieves the current policy values for the horizontal and vertical
 525  * scrollbars. See gtk_scrolled_window_set_policy().
 526  **/
 527 void
 528 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 529                                 GtkPolicyType     *hscrollbar_policy,
 530                                 GtkPolicyType     *vscrollbar_policy)
 531 {
 532   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 533
 534   if (hscrollbar_policy)
 535     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 536   if (vscrollbar_policy)
 537     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 538 }
 539
 540 void
 541 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 542                                    GtkCornerType      window_placement)
 543 {
 544   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 545
 546   if (scrolled_window->window_placement != window_placement)
 547     {
 548       scrolled_window->window_placement = window_placement;
 549
 550       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 551
 552       g_object_notify (G_OBJECT (scrolled_window), "window_placement");
 553     }
 554 }
 555
 556 /**
 557  * gtk_scrolled_window_get_placement:
 558  * @scrolled_window: a #GtkScrolledWindow
 559  *
 560  * Gets the placement of the scrollbars for the scrolled window. See
 561  * gtk_scrolled_window_set_placement().
 562  *
 563  * Return value: the current placement value.
 564  **/
 565 GtkCornerType
 566 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 567 {
 568   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 569
 570   return scrolled_window->window_placement;
 571 }
 572
 573 /**
 574  * gtk_scrolled_window_set_shadow_type:
 575  * @scrolled_window: a #GtkScrolledWindow
 576  * @type: kind of shadow to draw around scrolled window contents
 577  *
 578  * Changes the type of shadow drawn around the contents of
 579  * @scrolled_window.
 580  *
 581  **/
 582 void
 583 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 584                                      GtkShadowType      type)
 585 {
 586   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 587   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 588
 589   if (scrolled_window->shadow_type != type)
 590     {
 591       scrolled_window->shadow_type = type;
 592
 593       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 594         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 595
 596       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 597
 598       g_object_notify (G_OBJECT (scrolled_window), "shadow_type");
 599     }
 600 }
 601
 602 /**
 603  * gtk_scrolled_window_get_shadow_type:
 604  * @scrolled_window: a #GtkScrolledWindow
 605  *
 606  * Gets the shadow type of the scrolled window. See
 607  * gtk_scrolled_window_set_shadow_type().
 608  *
 609  * Return value: the current shadow type
 610  **/
 611 GtkShadowType
 612 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 613 {
 614   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 615
 616   return scrolled_window->shadow_type;
 617 }
 618
 619 static void
 620 gtk_scrolled_window_destroy (GtkObject *object)
 621 {
 622   GtkScrolledWindow *scrolled_window;
 623
 624   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
 625
 626   scrolled_window = GTK_SCROLLED_WINDOW (object);
 627
 628   gtk_widget_unparent (scrolled_window->hscrollbar);
 629   gtk_widget_unparent (scrolled_window->vscrollbar);
 630   gtk_widget_destroy (scrolled_window->hscrollbar);
 631   gtk_widget_destroy (scrolled_window->vscrollbar);
 632
 633   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 634 }
 635
 636 static void
 637 gtk_scrolled_window_finalize (GObject *object)
 638 {
 639   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 640
 641   g_object_unref (scrolled_window->hscrollbar);
 642   g_object_unref (scrolled_window->vscrollbar);
 643
 644   G_OBJECT_CLASS (parent_class)->finalize (object);
 645 }
 646
 647 static void
 648 gtk_scrolled_window_set_property (GObject      *object,
 649                                   guint         prop_id,
 650                                   const GValue *value,
 651                                   GParamSpec   *pspec)
 652 {
 653   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 654
 655   switch (prop_id)
 656     {
 657     case PROP_HADJUSTMENT:
 658       gtk_scrolled_window_set_hadjustment (scrolled_window,
 659                                            g_value_get_object (value));
 660       break;
 661     case PROP_VADJUSTMENT:
 662       gtk_scrolled_window_set_vadjustment (scrolled_window,
 663                                            g_value_get_object (value));
 664       break;
 665     case PROP_HSCROLLBAR_POLICY:
 666       gtk_scrolled_window_set_policy (scrolled_window,
 667                                       g_value_get_enum (value),
 668                                       scrolled_window->vscrollbar_policy);
 669       break;
 670     case PROP_VSCROLLBAR_POLICY:
 671       gtk_scrolled_window_set_policy (scrolled_window,
 672                                       scrolled_window->hscrollbar_policy,
 673                                       g_value_get_enum (value));
 674       break;
 675     case PROP_WINDOW_PLACEMENT:
 676       gtk_scrolled_window_set_placement (scrolled_window,
 677                                          g_value_get_enum (value));
 678       break;
 679     case PROP_SHADOW_TYPE:
 680       gtk_scrolled_window_set_shadow_type (scrolled_window,
 681                                            g_value_get_enum (value));
 682       break;
 683     default:
 684       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 685       break;
 686     }
 687 }
 688
 689 static void
 690 gtk_scrolled_window_get_property (GObject    *object,
 691                                   guint       prop_id,
 692                                   GValue     *value,
 693                                   GParamSpec *pspec)
 694 {
 695   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 696
 697   switch (prop_id)
 698     {
 699     case PROP_HADJUSTMENT:
 700       g_value_set_object (value,
 701                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 702       break;
 703     case PROP_VADJUSTMENT:
 704       g_value_set_object (value,
 705                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 706       break;
 707     case PROP_HSCROLLBAR_POLICY:
 708       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 709       break;
 710     case PROP_VSCROLLBAR_POLICY:
 711       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 712       break;
 713     case PROP_WINDOW_PLACEMENT:
 714       g_value_set_enum (value, scrolled_window->window_placement);
 715       break;
 716     case PROP_SHADOW_TYPE:
 717       g_value_set_enum (value, scrolled_window->shadow_type);
 718       break;
 719     default:
 720       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 721       break;
 722     }
 723 }
 724
 725 static void
 726 gtk_scrolled_window_paint (GtkWidget    *widget,
 727                            GdkRectangle *area)
 728 {
 729   GtkAllocation relative_allocation;
 730   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 731
 732   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 733     {
 734       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
 735
 736       relative_allocation.x -= widget->style->xthickness;
 737       relative_allocation.y -= widget->style->ythickness;
 738       relative_allocation.width += 2 * widget->style->xthickness;
 739       relative_allocation.height += 2 * widget->style->ythickness;
 740
 741       gtk_paint_shadow (widget->style, widget->window,
 742                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
 743                         area, widget, "scrolled_window",
 744                         widget->allocation.x + relative_allocation.x,
 745                         widget->allocation.y + relative_allocation.y,
 746                         relative_allocation.width,
 747                         relative_allocation.height);
 748     }
 749 }
 750
 751 static gint
 752 gtk_scrolled_window_expose (GtkWidget      *widget,
 753                             GdkEventExpose *event)
 754 {
 755   if (GTK_WIDGET_DRAWABLE (widget))
 756     {
 757       gtk_scrolled_window_paint (widget, &event->area);
 758
 759       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 760     }
 761
 762   return FALSE;
 763 }
 764
 765 static void
 766 gtk_scrolled_window_forall (GtkContainer *container,
 767                             gboolean      include_internals,
 768                             GtkCallback   callback,
 769                             gpointer      callback_data)
 770 {
 771   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 772   g_return_if_fail (callback != NULL);
 773
 774   GTK_CONTAINER_CLASS (parent_class)->forall (container,
 775                                               include_internals,
 776                                               callback,
 777                                               callback_data);
 778   if (include_internals)
 779     {
 780       GtkScrolledWindow *scrolled_window;
 781
 782       scrolled_window = GTK_SCROLLED_WINDOW (container);
 783
 784       if (scrolled_window->vscrollbar)
 785         callback (scrolled_window->vscrollbar, callback_data);
 786       if (scrolled_window->hscrollbar)
 787         callback (scrolled_window->hscrollbar, callback_data);
 788     }
 789 }
 790
 791 static void
 792 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
 793                                   GtkScrollType      scroll,
 794                                   gboolean           horizontal)
 795 {
 796   GtkAdjustment *adjustment = NULL;
 797
 798   switch (scroll)
 799     {
 800     case GTK_SCROLL_STEP_UP:
 801       scroll = GTK_SCROLL_STEP_BACKWARD;
 802       horizontal = FALSE;
 803       break;
 804     case GTK_SCROLL_STEP_DOWN:
 805       scroll = GTK_SCROLL_STEP_FORWARD;
 806       horizontal = FALSE;
 807       break;
 808     case GTK_SCROLL_STEP_LEFT:
 809       scroll = GTK_SCROLL_STEP_BACKWARD;
 810       horizontal = TRUE;
 811       break;
 812     case GTK_SCROLL_STEP_RIGHT:
 813       scroll = GTK_SCROLL_STEP_FORWARD;
 814       horizontal = TRUE;
 815       break;
 816     case GTK_SCROLL_PAGE_UP:
 817       scroll = GTK_SCROLL_PAGE_BACKWARD;
 818       horizontal = FALSE;
 819       break;
 820     case GTK_SCROLL_PAGE_DOWN:
 821       scroll = GTK_SCROLL_PAGE_FORWARD;
 822       horizontal = FALSE;
 823       break;
 824     case GTK_SCROLL_PAGE_LEFT:
 825       scroll = GTK_SCROLL_STEP_BACKWARD;
 826       horizontal = TRUE;
 827       break;
 828     case GTK_SCROLL_PAGE_RIGHT:
 829       scroll = GTK_SCROLL_STEP_FORWARD;
 830       horizontal = TRUE;
 831       break;
 832     case GTK_SCROLL_STEP_BACKWARD:
 833     case GTK_SCROLL_STEP_FORWARD:
 834     case GTK_SCROLL_PAGE_BACKWARD:
 835     case GTK_SCROLL_PAGE_FORWARD:
 836     case GTK_SCROLL_START:
 837     case GTK_SCROLL_END:
 838       break;
 839     default:
 840       g_warning ("Invalid scroll type %d for GtkSpinButton::change-value", scroll);
 841       return;
 842     }
 843
 844   if (horizontal)
 845     {
 846       if (scrolled_window->hscrollbar)
 847         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 848     }
 849   else
 850     {
 851       if (scrolled_window->vscrollbar)
 852         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 853     }
 854
 855   if (adjustment)
 856     {
 857       gdouble value = adjustment->value;
 858
 859       switch (scroll)
 860         {
 861         case GTK_SCROLL_STEP_FORWARD:
 862           value += adjustment->step_increment;
 863           break;
 864         case GTK_SCROLL_STEP_BACKWARD:
 865           value -= adjustment->step_increment;
 866           break;
 867         case GTK_SCROLL_PAGE_FORWARD:
 868           value += adjustment->page_increment;
 869           break;
 870         case GTK_SCROLL_PAGE_BACKWARD:
 871           value -= adjustment->page_increment;
 872           break;
 873         case GTK_SCROLL_START:
 874           value = adjustment->lower;
 875           break;
 876         case GTK_SCROLL_END:
 877           value = adjustment->upper;
 878           break;
 879         default:
 880           g_assert_not_reached ();
 881           break;
 882         }
 883
 884       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
 885
 886       gtk_adjustment_set_value (adjustment, value);
 887     }
 888 }
 889
 890 static void
 891 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
 892                                     GtkDirectionType   direction_type)
 893 {
 894   GtkWidget *toplevel;
 895
 896   /* Focus out of the scrolled window entirely. We do this by setting
 897    * a flag, then propagating the focus motion to the notebook.
 898    */
 899   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
 900   if (!GTK_WIDGET_TOPLEVEL (toplevel))
 901     return;
 902
 903   g_object_ref (scrolled_window);
 904
 905   scrolled_window->focus_out = TRUE;
 906   g_signal_emit_by_name (toplevel, "move_focus", direction_type);
 907   scrolled_window->focus_out = FALSE;
 908
 909   g_object_unref (scrolled_window);
 910 }
 911
 912 static void
 913 gtk_scrolled_window_size_request (GtkWidget      *widget,
 914                                   GtkRequisition *requisition)
 915 {
 916   GtkScrolledWindow *scrolled_window;
 917   GtkBin *bin;
 918   gint extra_width;
 919   gint extra_height;
 920   gint scrollbar_spacing;
 921   GtkRequisition hscrollbar_requisition;
 922   GtkRequisition vscrollbar_requisition;
 923   GtkRequisition child_requisition;
 924
 925   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 926   g_return_if_fail (requisition != NULL);
 927
 928   scrolled_window = GTK_SCROLLED_WINDOW (widget);
 929   bin = GTK_BIN (scrolled_window);
 930
 931   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
 932
 933   extra_width = 0;
 934   extra_height = 0;
 935   requisition->width = 0;
 936   requisition->height = 0;
 937
 938   gtk_widget_size_request (scrolled_window->hscrollbar,
 939                            &hscrollbar_requisition);
 940   gtk_widget_size_request (scrolled_window->vscrollbar,
 941                            &vscrollbar_requisition);
 942
 943   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 944     {
 945       gtk_widget_size_request (bin->child, &child_requisition);
 946
 947       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
 948         requisition->width += child_requisition.width;
 949       else
 950         {
 951           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 952
 953           if (aux_info && aux_info->width > 0)
 954             {
 955               requisition->width += aux_info->width;
 956               extra_width = -1;
 957             }
 958           else
 959             requisition->width += vscrollbar_requisition.width;
 960         }
 961
 962       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
 963         requisition->height += child_requisition.height;
 964       else
 965         {
 966           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 967
 968           if (aux_info && aux_info->height > 0)
 969             {
 970               requisition->height += aux_info->height;
 971               extra_height = -1;
 972             }
 973           else
 974             requisition->height += hscrollbar_requisition.height;
 975         }
 976     }
 977
 978   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
 979       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 980     {
 981       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
 982       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 983         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
 984     }
 985
 986   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
 987       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 988     {
 989       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
 990       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 991         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
 992     }
 993
 994   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
 995   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
 996
 997   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 998     {
 999       requisition->width += 2 * widget->style->xthickness;
1000       requisition->height += 2 * widget->style->ythickness;
1001     }
1002 }
1003
1004 static void
1005 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1006                                          GtkAllocation *allocation)
1007 {
1008   GtkScrolledWindow *scrolled_window;
1009   gint scrollbar_spacing;
1010
1011   g_return_if_fail (widget != NULL);
1012   g_return_if_fail (allocation != NULL);
1013
1014   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1015   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1016
1017   allocation->x = GTK_CONTAINER (widget)->border_width;
1018   allocation->y = GTK_CONTAINER (widget)->border_width;
1019
1020   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1021     {
1022       allocation->x += widget->style->xthickness;
1023       allocation->y += widget->style->ythickness;
1024     }
1025
1026   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1027   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1028
1029   if (scrolled_window->vscrollbar_visible)
1030     {
1031       GtkRequisition vscrollbar_requisition;
1032       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1033                                         &vscrollbar_requisition);
1034
1035       if (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
1036           scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
1037         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1038
1039       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1040     }
1041   if (scrolled_window->hscrollbar_visible)
1042     {
1043       GtkRequisition hscrollbar_requisition;
1044       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1045                                         &hscrollbar_requisition);
1046
1047       if (scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT ||
1048           scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
1049         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1050
1051       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1052     }
1053 }
1054
1055 static void
1056 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1057                                    GtkAllocation *allocation)
1058 {
1059   GtkScrolledWindow *scrolled_window;
1060   GtkBin *bin;
1061   GtkAllocation relative_allocation;
1062   GtkAllocation child_allocation;
1063   gint scrollbar_spacing;
1064
1065   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1066   g_return_if_fail (allocation != NULL);
1067
1068   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1069   bin = GTK_BIN (scrolled_window);
1070
1071   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1072
1073   widget->allocation = *allocation;
1074
1075   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1076     scrolled_window->hscrollbar_visible = TRUE;
1077   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1078     scrolled_window->hscrollbar_visible = FALSE;
1079   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1080     scrolled_window->vscrollbar_visible = TRUE;
1081   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1082     scrolled_window->vscrollbar_visible = FALSE;
1083
1084   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1085     {
1086       gboolean previous_hvis;
1087       gboolean previous_vvis;
1088       guint count = 0;
1089
1090       do
1091         {
1092           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1093
1094           child_allocation.x = relative_allocation.x + allocation->x;
1095           child_allocation.y = relative_allocation.y + allocation->y;
1096           child_allocation.width = relative_allocation.width;
1097           child_allocation.height = relative_allocation.height;
1098
1099           previous_hvis = scrolled_window->hscrollbar_visible;
1100           previous_vvis = scrolled_window->vscrollbar_visible;
1101
1102           gtk_widget_size_allocate (bin->child, &child_allocation);
1103
1104           /* If, after the first iteration, the hscrollbar and the
1105            * vscrollbar flip visiblity, then we need both.
1106            */
1107           if (count &&
1108               previous_hvis != scrolled_window->hscrollbar_visible &&
1109               previous_vvis != scrolled_window->vscrollbar_visible)
1110             {
1111               scrolled_window->hscrollbar_visible = TRUE;
1112               scrolled_window->vscrollbar_visible = TRUE;
1113
1114               /* a new resize is already queued at this point,
1115                * so we will immediatedly get reinvoked
1116                */
1117               return;
1118             }
1119
1120           count++;
1121         }
1122       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1123              previous_vvis != scrolled_window->vscrollbar_visible);
1124     }
1125   else
1126     gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1127
1128   if (scrolled_window->hscrollbar_visible)
1129     {
1130       GtkRequisition hscrollbar_requisition;
1131       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1132                                         &hscrollbar_requisition);
1133
1134       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1135         gtk_widget_show (scrolled_window->hscrollbar);
1136
1137       child_allocation.x = relative_allocation.x;
1138       if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1139           scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT)
1140         child_allocation.y = (relative_allocation.y +
1141                               relative_allocation.height +
1142                               scrollbar_spacing +
1143                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1144                                0 : widget->style->ythickness));
1145       else
1146         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1147
1148       child_allocation.width = relative_allocation.width;
1149       child_allocation.height = hscrollbar_requisition.height;
1150       child_allocation.x += allocation->x;
1151       child_allocation.y += allocation->y;
1152
1153       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1154         {
1155           child_allocation.x -= widget->style->xthickness;
1156           child_allocation.width += 2 * widget->style->xthickness;
1157         }
1158
1159       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1160     }
1161   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1162     gtk_widget_hide (scrolled_window->hscrollbar);
1163
1164   if (scrolled_window->vscrollbar_visible)
1165     {
1166       GtkRequisition vscrollbar_requisition;
1167       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1168         gtk_widget_show (scrolled_window->vscrollbar);
1169
1170       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1171                                         &vscrollbar_requisition);
1172
1173       if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1174           scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)
1175         child_allocation.x = (relative_allocation.x +
1176                               relative_allocation.width +
1177                               scrollbar_spacing +
1178                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1179                                0 : widget->style->xthickness));
1180       else
1181         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1182
1183       child_allocation.y = relative_allocation.y;
1184       child_allocation.width = vscrollbar_requisition.width;
1185       child_allocation.height = relative_allocation.height;
1186       child_allocation.x += allocation->x;
1187       child_allocation.y += allocation->y;
1188
1189       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1190         {
1191           child_allocation.y -= widget->style->ythickness;
1192           child_allocation.height += 2 * widget->style->ythickness;
1193         }
1194
1195       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1196     }
1197   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1198     gtk_widget_hide (scrolled_window->vscrollbar);
1199 }
1200
1201 static gint
1202 gtk_scrolled_window_scroll_event (GtkWidget *widget,
1203                                   GdkEventScroll *event)
1204 {
1205   GtkWidget *range;
1206
1207   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1208   g_return_val_if_fail (event != NULL, FALSE);
1209
1210   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1211     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1212   else
1213     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1214
1215   if (range && GTK_WIDGET_VISIBLE (range))
1216     {
1217       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1218       gdouble new_value;
1219
1220       if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_LEFT)
1221         new_value = adj->value - adj->page_increment / 2;
1222       else
1223         new_value = adj->value + adj->page_increment / 2;
1224
1225       new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
1226       gtk_adjustment_set_value (adj, new_value);
1227
1228       return TRUE;
1229     }
1230
1231   return FALSE;
1232 }
1233
1234 static gint
1235 gtk_scrolled_window_focus (GtkWidget        *widget,
1236                            GtkDirectionType  direction)
1237 {
1238   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1239   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1240
1241   if (scrolled_window->focus_out)
1242     {
1243       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1244       return FALSE;
1245     }
1246
1247   if (gtk_widget_is_focus (widget))
1248     return FALSE;
1249
1250   /* We only put the scrolled window itself in the focus chain if it
1251    * isn't possible to focus any children.
1252    */
1253   if (GTK_BIN (widget)->child)
1254     {
1255       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1256         return TRUE;
1257     }
1258
1259   if (!had_focus_child)
1260     {
1261       gtk_widget_grab_focus (widget);
1262       return TRUE;
1263     }
1264   else
1265     return FALSE;
1266 }
1267
1268 static void
1269 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1270                                         gpointer       data)
1271 {
1272   GtkScrolledWindow *scrolled_win;
1273
1274   g_return_if_fail (adjustment != NULL);
1275   g_return_if_fail (data != NULL);
1276
1277   scrolled_win = GTK_SCROLLED_WINDOW (data);
1278
1279   if (scrolled_win->hscrollbar &&
1280       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1281     {
1282       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1283         {
1284           gboolean visible;
1285
1286           visible = scrolled_win->hscrollbar_visible;
1287           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1288                                               adjustment->page_size);
1289           if (scrolled_win->hscrollbar_visible != visible)
1290             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1291         }
1292     }
1293   else if (scrolled_win->vscrollbar &&
1294            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1295     {
1296       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1297         {
1298           gboolean visible;
1299
1300           visible = scrolled_win->vscrollbar_visible;
1301           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1302                                               adjustment->page_size);
1303           if (scrolled_win->vscrollbar_visible != visible)
1304             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1305         }
1306     }
1307 }
1308
1309 static void
1310 gtk_scrolled_window_add (GtkContainer *container,
1311                          GtkWidget    *child)
1312 {
1313   GtkScrolledWindow *scrolled_window;
1314   GtkBin *bin;
1315
1316   bin = GTK_BIN (container);
1317   g_return_if_fail (bin->child == NULL);
1318
1319   scrolled_window = GTK_SCROLLED_WINDOW (container);
1320
1321   bin->child = child;
1322   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1323
1324   /* this is a temporary message */
1325   if (!gtk_widget_set_scroll_adjustments (child,
1326                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1327                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1328     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1329                "use gtk_scrolled_window_add_with_viewport() instead");
1330 }
1331
1332 static void
1333 gtk_scrolled_window_remove (GtkContainer *container,
1334                             GtkWidget    *child)
1335 {
1336   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1337   g_return_if_fail (child != NULL);
1338   g_return_if_fail (GTK_BIN (container)->child == child);
1339
1340   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1341
1342   /* chain parent class handler to remove child */
1343   GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
1344 }
1345
1346 void
1347 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1348                                        GtkWidget         *child)
1349 {
1350   GtkBin *bin;
1351   GtkWidget *viewport;
1352
1353   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1354   g_return_if_fail (GTK_IS_WIDGET (child));
1355   g_return_if_fail (child->parent == NULL);
1356
1357   bin = GTK_BIN (scrolled_window);
1358
1359   if (bin->child != NULL)
1360     {
1361       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1362       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1363
1364       viewport = bin->child;
1365     }
1366   else
1367     {
1368       viewport =
1369         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1370                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1371       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1372     }
1373
1374   gtk_widget_show (viewport);
1375   gtk_container_add (GTK_CONTAINER (viewport), child);
1376 }
1377
1378 /**
1379  * _gtk_scrolled_window_get_spacing:
1380  * @scrolled_window: a scrolled window
1381  *
1382  * Gets the spacing between the scrolled window's scrollbars and
1383  * the scrolled widget. Used by GtkCombo
1384  *
1385  * Return value: the spacing, in pixels.
1386  **/
1387 gint
1388 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1389 {
1390   GtkScrolledWindowClass *class;
1391
1392   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1393
1394   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1395
1396   if (class->scrollbar_spacing >= 0)
1397     return class->scrollbar_spacing;
1398   else
1399     {
1400       gint scrollbar_spacing;
1401
1402       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1403                             "scrollbar_spacing", &scrollbar_spacing,
1404                             NULL);
1405
1406       return scrollbar_spacing;
1407     }
1408 }