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 <math.h>
  28 #include <gdk/gdkkeysyms.h>
  29 #include "gtkbindings.h"
  30 #include "gtkmarshalers.h"
  31 #include "gtkscrolledwindow.h"
  32 #include "gtkintl.h"
  33
  34
  35 /* scrolled window policy and size requisition handling:
  36  *
  37  * gtk size requisition works as follows:
  38  *   a widget upon size-request reports the width and height that it finds
  39  *   to be best suited to display its contents, including children.
  40  *   the width and/or height reported from a widget upon size requisition
  41  *   may be overidden by the user by specifying a width and/or height
  42  *   other than 0 through gtk_widget_set_usize().
  43  *
  44  * a scrolled window needs (for imlementing all three policy types) to
  45  * request its width and height based on two different rationales.
  46  * 1)   the user wants the scrolled window to just fit into the space
  47  *      that it gets allocated for a specifc dimension.
  48  * 1.1) this does not apply if the user specified a concrete value
  49  *      value for that specific dimension by either specifying usize for the
  50  *      scrolled window or for its child.
  51  * 2)   the user wants the scrolled window to take as much space up as
  52  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
  53  *
  54  * also, kinda obvious:
  55  * 3)   a user would certainly not have choosen a scrolled window as a container
  56  *      for the child, if the resulting allocation takes up more space than the
  57  *      child would have allocated without the scrolled window.
  58  *
  59  * conclusions:
  60  * A) from 1) follows: the scrolled window shouldn't request more space for a
  61  *    specifc dimension than is required at minimum.
  62  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
  63  *    window (done automatically) or by usize of the child (needs to be checked).
  64  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
  65  *    child's dimension.
  66  * D) from 3) follows: the scrolled window child's minimum width and minimum height
  67  *    under A) at least correspond to the space taken up by its scrollbars.
  68  */
  69
  70 #define DEFAULT_SCROLLBAR_SPACING  3
  71
  72 enum {
  73   PROP_0,
  74   PROP_HADJUSTMENT,
  75   PROP_VADJUSTMENT,
  76   PROP_HSCROLLBAR_POLICY,
  77   PROP_VSCROLLBAR_POLICY,
  78   PROP_WINDOW_PLACEMENT,
  79   PROP_SHADOW_TYPE,
  80   PROP_LAST
  81 };
  82
  83 /* Signals */
  84 enum
  85 {
  86   SCROLL_CHILD,
  87   MOVE_FOCUS_OUT,
  88   LAST_SIGNAL
  89 };
  90
  91 static void gtk_scrolled_window_class_init         (GtkScrolledWindowClass *klass);
  92 static void gtk_scrolled_window_init               (GtkScrolledWindow      *scrolled_window);
  93 static void gtk_scrolled_window_destroy            (GtkObject              *object);
  94 static void gtk_scrolled_window_finalize           (GObject                *object);
  95 static void gtk_scrolled_window_set_property       (GObject                *object,
  96                                                     guint                   prop_id,
  97                                                     const GValue           *value,
  98                                                     GParamSpec             *pspec);
  99 static void gtk_scrolled_window_get_property       (GObject                *object,
 100                                                     guint                   prop_id,
 101                                                     GValue                 *value,
 102                                                     GParamSpec             *pspec);
 103
 104 static gint gtk_scrolled_window_expose             (GtkWidget              *widget,
 105                                                     GdkEventExpose         *event);
 106 static void gtk_scrolled_window_size_request       (GtkWidget              *widget,
 107                                                     GtkRequisition         *requisition);
 108 static void gtk_scrolled_window_size_allocate      (GtkWidget              *widget,
 109                                                     GtkAllocation          *allocation);
 110 static gint gtk_scrolled_window_scroll_event       (GtkWidget              *widget,
 111                                                     GdkEventScroll         *event);
 112 static gint gtk_scrolled_window_focus              (GtkWidget              *widget,
 113                                                     GtkDirectionType        direction);
 114 static void gtk_scrolled_window_add                (GtkContainer           *container,
 115                                                     GtkWidget              *widget);
 116 static void gtk_scrolled_window_remove             (GtkContainer           *container,
 117                                                     GtkWidget              *widget);
 118 static void gtk_scrolled_window_forall             (GtkContainer           *container,
 119                                                     gboolean                include_internals,
 120                                                     GtkCallback             callback,
 121                                                     gpointer                callback_data);
 122 static void gtk_scrolled_window_scroll_child       (GtkScrolledWindow      *scrolled_window,
 123                                                     GtkScrollType           scroll,
 124                                                     gboolean                horizontal);
 125 static void gtk_scrolled_window_move_focus_out     (GtkScrolledWindow      *scrolled_window,
 126                                                     GtkDirectionType        direction_type);
 127
 128 static void gtk_scrolled_window_relative_allocation(GtkWidget              *widget,
 129                                                     GtkAllocation          *allocation);
 130 static void gtk_scrolled_window_adjustment_changed (GtkAdjustment          *adjustment,
 131                                                     gpointer                data);
 132
 133 static GtkContainerClass *parent_class = NULL;
 134
 135 static guint signals[LAST_SIGNAL] = {0};
 136
 137 GType
 138 gtk_scrolled_window_get_type (void)
 139 {
 140   static GType scrolled_window_type = 0;
 141
 142   if (!scrolled_window_type)
 143     {
 144       static const GTypeInfo scrolled_window_info =
 145       {
 146         sizeof (GtkScrolledWindowClass),
 147         NULL,           /* base_init */
 148         NULL,           /* base_finalize */
 149         (GClassInitFunc) gtk_scrolled_window_class_init,
 150         NULL,           /* class_finalize */
 151         NULL,           /* class_data */
 152         sizeof (GtkScrolledWindow),
 153         0,              /* n_preallocs */
 154         (GInstanceInitFunc) gtk_scrolled_window_init,
 155       };
 156
 157       scrolled_window_type =
 158         g_type_register_static (GTK_TYPE_BIN, "GtkScrolledWindow",
 159                                 &scrolled_window_info, 0);
 160     }
 161
 162   return scrolled_window_type;
 163 }
 164
 165 static void
 166 add_scroll_binding (GtkBindingSet  *binding_set,
 167                     guint           keyval,
 168                     GdkModifierType mask,
 169                     GtkScrollType   scroll,
 170                     gboolean        horizontal)
 171 {
 172   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 173
 174   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 175                                 "scroll_child", 2,
 176                                 GTK_TYPE_SCROLL_TYPE, scroll,
 177                                 G_TYPE_BOOLEAN, horizontal);
 178   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 179                                 "scroll_child", 2,
 180                                 GTK_TYPE_SCROLL_TYPE, scroll,
 181                                 G_TYPE_BOOLEAN, horizontal);
 182 }
 183
 184 static void
 185 add_tab_bindings (GtkBindingSet    *binding_set,
 186                   GdkModifierType   modifiers,
 187                   GtkDirectionType  direction)
 188 {
 189   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 190                                 "move_focus_out", 1,
 191                                 GTK_TYPE_DIRECTION_TYPE, direction);
 192   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 193                                 "move_focus_out", 1,
 194                                 GTK_TYPE_DIRECTION_TYPE, direction);
 195 }
 196
 197 static void
 198 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 199 {
 200   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 201   GtkObjectClass *object_class;
 202   GtkWidgetClass *widget_class;
 203   GtkContainerClass *container_class;
 204   GtkBindingSet *binding_set;
 205
 206   object_class = (GtkObjectClass*) class;
 207   widget_class = (GtkWidgetClass*) class;
 208   container_class = (GtkContainerClass*) class;
 209
 210   parent_class = g_type_class_peek_parent (class);
 211
 212   gobject_class->finalize = gtk_scrolled_window_finalize;
 213   gobject_class->set_property = gtk_scrolled_window_set_property;
 214   gobject_class->get_property = gtk_scrolled_window_get_property;
 215
 216   object_class->destroy = gtk_scrolled_window_destroy;
 217
 218   widget_class->expose_event = gtk_scrolled_window_expose;
 219   widget_class->size_request = gtk_scrolled_window_size_request;
 220   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 221   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 222   widget_class->focus = gtk_scrolled_window_focus;
 223
 224   container_class->add = gtk_scrolled_window_add;
 225   container_class->remove = gtk_scrolled_window_remove;
 226   container_class->forall = gtk_scrolled_window_forall;
 227
 228   class->scrollbar_spacing = -1;
 229
 230   class->scroll_child = gtk_scrolled_window_scroll_child;
 231   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 232
 233   g_object_class_install_property (gobject_class,
 234                                    PROP_HADJUSTMENT,
 235                                    g_param_spec_object ("hadjustment",
 236                                                         P_("Horizontal Adjustment"),
 237                                                         P_("The GtkAdjustment for the horizontal position"),
 238                                                         GTK_TYPE_ADJUSTMENT,
 239                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 240   g_object_class_install_property (gobject_class,
 241                                    PROP_VADJUSTMENT,
 242                                    g_param_spec_object ("vadjustment",
 243                                                         P_("Vertical Adjustment"),
 244                                                         P_("The GtkAdjustment for the vertical position"),
 245                                                         GTK_TYPE_ADJUSTMENT,
 246                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 247   g_object_class_install_property (gobject_class,
 248                                    PROP_HSCROLLBAR_POLICY,
 249                                    g_param_spec_enum ("hscrollbar_policy",
 250                                                       P_("Horizontal Scrollbar Policy"),
 251                                                       P_("When the horizontal scrollbar is displayed"),
 252                                                       GTK_TYPE_POLICY_TYPE,
 253                                                       GTK_POLICY_ALWAYS,
 254                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 255   g_object_class_install_property (gobject_class,
 256                                    PROP_VSCROLLBAR_POLICY,
 257                                    g_param_spec_enum ("vscrollbar_policy",
 258                                                       P_("Vertical Scrollbar Policy"),
 259                                                       P_("When the vertical scrollbar is displayed"),
 260                                                       GTK_TYPE_POLICY_TYPE,
 261                                                       GTK_POLICY_ALWAYS,
 262                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 263
 264   g_object_class_install_property (gobject_class,
 265                                    PROP_WINDOW_PLACEMENT,
 266                                    g_param_spec_enum ("window_placement",
 267                                                       P_("Window Placement"),
 268                                                       P_("Where the contents are located with respect to the scrollbars"),
 269                                                       GTK_TYPE_CORNER_TYPE,
 270                                                       GTK_CORNER_TOP_LEFT,
 271                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 272   g_object_class_install_property (gobject_class,
 273                                    PROP_SHADOW_TYPE,
 274                                    g_param_spec_enum ("shadow_type",
 275                                                       P_("Shadow Type"),
 276                                                       P_("Style of bevel around the contents"),
 277                                                       GTK_TYPE_SHADOW_TYPE,
 278                                                       GTK_SHADOW_NONE,
 279                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 280
 281   gtk_widget_class_install_style_property (widget_class,
 282                                            g_param_spec_int ("scrollbar_spacing",
 283                                                              P_("Scrollbar spacing"),
 284                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 285                                                              0,
 286                                                              G_MAXINT,
 287                                                              DEFAULT_SCROLLBAR_SPACING,
 288                                                              G_PARAM_READABLE));
 289
 290   signals[SCROLL_CHILD] =
 291     g_signal_new ("scroll_child",
 292                   G_TYPE_FROM_CLASS (object_class),
 293                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 294                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 295                   NULL, NULL,
 296                   _gtk_marshal_VOID__ENUM_BOOLEAN,
 297                   G_TYPE_NONE, 2,
 298                   GTK_TYPE_SCROLL_TYPE,
 299                   G_TYPE_BOOLEAN);
 300   signals[MOVE_FOCUS_OUT] =
 301     g_signal_new ("move_focus_out",
 302                   G_TYPE_FROM_CLASS (object_class),
 303                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 304                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 305                   NULL, NULL,
 306                   _gtk_marshal_VOID__ENUM,
 307                   G_TYPE_NONE, 1,
 308                   GTK_TYPE_DIRECTION_TYPE);
 309
 310   binding_set = gtk_binding_set_by_class (class);
 311
 312   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 313   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 314   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 315   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 316
 317   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 318   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 319   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 320   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 321
 322   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 323   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 324   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 325   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 326
 327   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 328   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 329 }
 330
 331 static void
 332 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 333 {
 334   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 335
 336   scrolled_window->hscrollbar = NULL;
 337   scrolled_window->vscrollbar = NULL;
 338   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 339   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 340   scrolled_window->hscrollbar_visible = FALSE;
 341   scrolled_window->vscrollbar_visible = FALSE;
 342   scrolled_window->focus_out = FALSE;
 343   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 344
 345 }
 346
 347 GtkWidget*
 348 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 349                          GtkAdjustment *vadjustment)
 350 {
 351   GtkWidget *scrolled_window;
 352
 353   if (hadjustment)
 354     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 355
 356   if (vadjustment)
 357     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 358
 359   scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
 360                                     "hadjustment", hadjustment,
 361                                     "vadjustment", vadjustment,
 362                                     NULL);
 363
 364   return scrolled_window;
 365 }
 366
 367 void
 368 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 369                                      GtkAdjustment     *hadjustment)
 370 {
 371   GtkBin *bin;
 372
 373   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 374   if (hadjustment)
 375     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 376   else
 377     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 378
 379   bin = GTK_BIN (scrolled_window);
 380
 381   if (!scrolled_window->hscrollbar)
 382     {
 383       gtk_widget_push_composite_child ();
 384       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 385       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 386       gtk_widget_pop_composite_child ();
 387
 388       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 389       g_object_ref (scrolled_window->hscrollbar);
 390       gtk_widget_show (scrolled_window->hscrollbar);
 391     }
 392   else
 393     {
 394       GtkAdjustment *old_adjustment;
 395
 396       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 397       if (old_adjustment == hadjustment)
 398         return;
 399
 400       g_signal_handlers_disconnect_by_func (old_adjustment,
 401                                             gtk_scrolled_window_adjustment_changed,
 402                                             scrolled_window);
 403       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 404                                 hadjustment);
 405     }
 406   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 407   g_signal_connect (hadjustment,
 408                     "changed",
 409                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 410                     scrolled_window);
 411   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 412
 413   if (bin->child)
 414     gtk_widget_set_scroll_adjustments (bin->child,
 415                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 416                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 417
 418   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 419 }
 420
 421 void
 422 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 423                                      GtkAdjustment     *vadjustment)
 424 {
 425   GtkBin *bin;
 426
 427   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 428   if (vadjustment)
 429     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 430   else
 431     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 432
 433   bin = GTK_BIN (scrolled_window);
 434
 435   if (!scrolled_window->vscrollbar)
 436     {
 437       gtk_widget_push_composite_child ();
 438       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 439       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 440       gtk_widget_pop_composite_child ();
 441
 442       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 443       g_object_ref (scrolled_window->vscrollbar);
 444       gtk_widget_show (scrolled_window->vscrollbar);
 445     }
 446   else
 447     {
 448       GtkAdjustment *old_adjustment;
 449
 450       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 451       if (old_adjustment == vadjustment)
 452         return;
 453
 454       g_signal_handlers_disconnect_by_func (old_adjustment,
 455                                             gtk_scrolled_window_adjustment_changed,
 456                                             scrolled_window);
 457       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 458                                 vadjustment);
 459     }
 460   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 461   g_signal_connect (vadjustment,
 462                     "changed",
 463                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 464                     scrolled_window);
 465   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 466
 467   if (bin->child)
 468     gtk_widget_set_scroll_adjustments (bin->child,
 469                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 470                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 471
 472   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 473 }
 474
 475 GtkAdjustment*
 476 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 477 {
 478   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 479
 480   return (scrolled_window->hscrollbar ?
 481           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 482           NULL);
 483 }
 484
 485 GtkAdjustment*
 486 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 487 {
 488   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 489
 490   return (scrolled_window->vscrollbar ?
 491           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 492           NULL);
 493 }
 494
 495 void
 496 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 497                                 GtkPolicyType      hscrollbar_policy,
 498                                 GtkPolicyType      vscrollbar_policy)
 499 {
 500   GObject *object = G_OBJECT (scrolled_window);
 501
 502   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 503
 504   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 505       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 506     {
 507       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 508       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 509
 510       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 511
 512       g_object_freeze_notify (object);
 513       g_object_notify (object, "hscrollbar_policy");
 514       g_object_notify (object, "vscrollbar_policy");
 515       g_object_thaw_notify (object);
 516     }
 517 }
 518
 519 /**
 520  * gtk_scrolled_window_get_policy:
 521  * @scrolled_window: a #GtkScrolledWindow
 522  * @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 523  * @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 524  *
 525  * Retrieves the current policy values for the horizontal and vertical
 526  * scrollbars. See gtk_scrolled_window_set_policy().
 527  **/
 528 void
 529 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 530                                 GtkPolicyType     *hscrollbar_policy,
 531                                 GtkPolicyType     *vscrollbar_policy)
 532 {
 533   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 534
 535   if (hscrollbar_policy)
 536     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 537   if (vscrollbar_policy)
 538     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 539 }
 540
 541 void
 542 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 543                                    GtkCornerType      window_placement)
 544 {
 545   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 546
 547   if (scrolled_window->window_placement != window_placement)
 548     {
 549       scrolled_window->window_placement = window_placement;
 550
 551       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 552
 553       g_object_notify (G_OBJECT (scrolled_window), "window_placement");
 554     }
 555 }
 556
 557 /**
 558  * gtk_scrolled_window_get_placement:
 559  * @scrolled_window: a #GtkScrolledWindow
 560  *
 561  * Gets the placement of the scrollbars for the scrolled window. See
 562  * gtk_scrolled_window_set_placement().
 563  *
 564  * Return value: the current placement value.
 565  **/
 566 GtkCornerType
 567 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 568 {
 569   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 570
 571   return scrolled_window->window_placement;
 572 }
 573
 574 /**
 575  * gtk_scrolled_window_set_shadow_type:
 576  * @scrolled_window: a #GtkScrolledWindow
 577  * @type: kind of shadow to draw around scrolled window contents
 578  *
 579  * Changes the type of shadow drawn around the contents of
 580  * @scrolled_window.
 581  *
 582  **/
 583 void
 584 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 585                                      GtkShadowType      type)
 586 {
 587   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 588   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 589
 590   if (scrolled_window->shadow_type != type)
 591     {
 592       scrolled_window->shadow_type = type;
 593
 594       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 595         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 596
 597       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 598
 599       g_object_notify (G_OBJECT (scrolled_window), "shadow_type");
 600     }
 601 }
 602
 603 /**
 604  * gtk_scrolled_window_get_shadow_type:
 605  * @scrolled_window: a #GtkScrolledWindow
 606  *
 607  * Gets the shadow type of the scrolled window. See
 608  * gtk_scrolled_window_set_shadow_type().
 609  *
 610  * Return value: the current shadow type
 611  **/
 612 GtkShadowType
 613 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 614 {
 615   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 616
 617   return scrolled_window->shadow_type;
 618 }
 619
 620 static void
 621 gtk_scrolled_window_destroy (GtkObject *object)
 622 {
 623   GtkScrolledWindow *scrolled_window;
 624
 625   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
 626
 627   scrolled_window = GTK_SCROLLED_WINDOW (object);
 628
 629   gtk_widget_unparent (scrolled_window->hscrollbar);
 630   gtk_widget_unparent (scrolled_window->vscrollbar);
 631   gtk_widget_destroy (scrolled_window->hscrollbar);
 632   gtk_widget_destroy (scrolled_window->vscrollbar);
 633
 634   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 635 }
 636
 637 static void
 638 gtk_scrolled_window_finalize (GObject *object)
 639 {
 640   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 641
 642   g_object_unref (scrolled_window->hscrollbar);
 643   g_object_unref (scrolled_window->vscrollbar);
 644
 645   G_OBJECT_CLASS (parent_class)->finalize (object);
 646 }
 647
 648 static void
 649 gtk_scrolled_window_set_property (GObject      *object,
 650                                   guint         prop_id,
 651                                   const GValue *value,
 652                                   GParamSpec   *pspec)
 653 {
 654   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 655
 656   switch (prop_id)
 657     {
 658     case PROP_HADJUSTMENT:
 659       gtk_scrolled_window_set_hadjustment (scrolled_window,
 660                                            g_value_get_object (value));
 661       break;
 662     case PROP_VADJUSTMENT:
 663       gtk_scrolled_window_set_vadjustment (scrolled_window,
 664                                            g_value_get_object (value));
 665       break;
 666     case PROP_HSCROLLBAR_POLICY:
 667       gtk_scrolled_window_set_policy (scrolled_window,
 668                                       g_value_get_enum (value),
 669                                       scrolled_window->vscrollbar_policy);
 670       break;
 671     case PROP_VSCROLLBAR_POLICY:
 672       gtk_scrolled_window_set_policy (scrolled_window,
 673                                       scrolled_window->hscrollbar_policy,
 674                                       g_value_get_enum (value));
 675       break;
 676     case PROP_WINDOW_PLACEMENT:
 677       gtk_scrolled_window_set_placement (scrolled_window,
 678                                          g_value_get_enum (value));
 679       break;
 680     case PROP_SHADOW_TYPE:
 681       gtk_scrolled_window_set_shadow_type (scrolled_window,
 682                                            g_value_get_enum (value));
 683       break;
 684     default:
 685       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 686       break;
 687     }
 688 }
 689
 690 static void
 691 gtk_scrolled_window_get_property (GObject    *object,
 692                                   guint       prop_id,
 693                                   GValue     *value,
 694                                   GParamSpec *pspec)
 695 {
 696   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 697
 698   switch (prop_id)
 699     {
 700     case PROP_HADJUSTMENT:
 701       g_value_set_object (value,
 702                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 703       break;
 704     case PROP_VADJUSTMENT:
 705       g_value_set_object (value,
 706                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 707       break;
 708     case PROP_HSCROLLBAR_POLICY:
 709       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 710       break;
 711     case PROP_VSCROLLBAR_POLICY:
 712       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 713       break;
 714     case PROP_WINDOW_PLACEMENT:
 715       g_value_set_enum (value, scrolled_window->window_placement);
 716       break;
 717     case PROP_SHADOW_TYPE:
 718       g_value_set_enum (value, scrolled_window->shadow_type);
 719       break;
 720     default:
 721       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 722       break;
 723     }
 724 }
 725
 726 static void
 727 gtk_scrolled_window_paint (GtkWidget    *widget,
 728                            GdkRectangle *area)
 729 {
 730   GtkAllocation relative_allocation;
 731   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 732
 733   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 734     {
 735       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
 736
 737       relative_allocation.x -= widget->style->xthickness;
 738       relative_allocation.y -= widget->style->ythickness;
 739       relative_allocation.width += 2 * widget->style->xthickness;
 740       relative_allocation.height += 2 * widget->style->ythickness;
 741
 742       gtk_paint_shadow (widget->style, widget->window,
 743                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
 744                         area, widget, "scrolled_window",
 745                         widget->allocation.x + relative_allocation.x,
 746                         widget->allocation.y + relative_allocation.y,
 747                         relative_allocation.width,
 748                         relative_allocation.height);
 749     }
 750 }
 751
 752 static gint
 753 gtk_scrolled_window_expose (GtkWidget      *widget,
 754                             GdkEventExpose *event)
 755 {
 756   if (GTK_WIDGET_DRAWABLE (widget))
 757     {
 758       gtk_scrolled_window_paint (widget, &event->area);
 759
 760       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 761     }
 762
 763   return FALSE;
 764 }
 765
 766 static void
 767 gtk_scrolled_window_forall (GtkContainer *container,
 768                             gboolean      include_internals,
 769                             GtkCallback   callback,
 770                             gpointer      callback_data)
 771 {
 772   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 773   g_return_if_fail (callback != NULL);
 774
 775   GTK_CONTAINER_CLASS (parent_class)->forall (container,
 776                                               include_internals,
 777                                               callback,
 778                                               callback_data);
 779   if (include_internals)
 780     {
 781       GtkScrolledWindow *scrolled_window;
 782
 783       scrolled_window = GTK_SCROLLED_WINDOW (container);
 784
 785       if (scrolled_window->vscrollbar)
 786         callback (scrolled_window->vscrollbar, callback_data);
 787       if (scrolled_window->hscrollbar)
 788         callback (scrolled_window->hscrollbar, callback_data);
 789     }
 790 }
 791
 792 static void
 793 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
 794                                   GtkScrollType      scroll,
 795                                   gboolean           horizontal)
 796 {
 797   GtkAdjustment *adjustment = NULL;
 798
 799   switch (scroll)
 800     {
 801     case GTK_SCROLL_STEP_UP:
 802       scroll = GTK_SCROLL_STEP_BACKWARD;
 803       horizontal = FALSE;
 804       break;
 805     case GTK_SCROLL_STEP_DOWN:
 806       scroll = GTK_SCROLL_STEP_FORWARD;
 807       horizontal = FALSE;
 808       break;
 809     case GTK_SCROLL_STEP_LEFT:
 810       scroll = GTK_SCROLL_STEP_BACKWARD;
 811       horizontal = TRUE;
 812       break;
 813     case GTK_SCROLL_STEP_RIGHT:
 814       scroll = GTK_SCROLL_STEP_FORWARD;
 815       horizontal = TRUE;
 816       break;
 817     case GTK_SCROLL_PAGE_UP:
 818       scroll = GTK_SCROLL_PAGE_BACKWARD;
 819       horizontal = FALSE;
 820       break;
 821     case GTK_SCROLL_PAGE_DOWN:
 822       scroll = GTK_SCROLL_PAGE_FORWARD;
 823       horizontal = FALSE;
 824       break;
 825     case GTK_SCROLL_PAGE_LEFT:
 826       scroll = GTK_SCROLL_STEP_BACKWARD;
 827       horizontal = TRUE;
 828       break;
 829     case GTK_SCROLL_PAGE_RIGHT:
 830       scroll = GTK_SCROLL_STEP_FORWARD;
 831       horizontal = TRUE;
 832       break;
 833     case GTK_SCROLL_STEP_BACKWARD:
 834     case GTK_SCROLL_STEP_FORWARD:
 835     case GTK_SCROLL_PAGE_BACKWARD:
 836     case GTK_SCROLL_PAGE_FORWARD:
 837     case GTK_SCROLL_START:
 838     case GTK_SCROLL_END:
 839       break;
 840     default:
 841       g_warning ("Invalid scroll type %d for GtkSpinButton::change-value", scroll);
 842       return;
 843     }
 844
 845   if (horizontal)
 846     {
 847       if (scrolled_window->hscrollbar)
 848         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 849     }
 850   else
 851     {
 852       if (scrolled_window->vscrollbar)
 853         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 854     }
 855
 856   if (adjustment)
 857     {
 858       gdouble value = adjustment->value;
 859
 860       switch (scroll)
 861         {
 862         case GTK_SCROLL_STEP_FORWARD:
 863           value += adjustment->step_increment;
 864           break;
 865         case GTK_SCROLL_STEP_BACKWARD:
 866           value -= adjustment->step_increment;
 867           break;
 868         case GTK_SCROLL_PAGE_FORWARD:
 869           value += adjustment->page_increment;
 870           break;
 871         case GTK_SCROLL_PAGE_BACKWARD:
 872           value -= adjustment->page_increment;
 873           break;
 874         case GTK_SCROLL_START:
 875           value = adjustment->lower;
 876           break;
 877         case GTK_SCROLL_END:
 878           value = adjustment->upper;
 879           break;
 880         default:
 881           g_assert_not_reached ();
 882           break;
 883         }
 884
 885       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
 886
 887       gtk_adjustment_set_value (adjustment, value);
 888     }
 889 }
 890
 891 static void
 892 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
 893                                     GtkDirectionType   direction_type)
 894 {
 895   GtkWidget *toplevel;
 896
 897   /* Focus out of the scrolled window entirely. We do this by setting
 898    * a flag, then propagating the focus motion to the notebook.
 899    */
 900   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
 901   if (!GTK_WIDGET_TOPLEVEL (toplevel))
 902     return;
 903
 904   g_object_ref (scrolled_window);
 905
 906   scrolled_window->focus_out = TRUE;
 907   g_signal_emit_by_name (toplevel, "move_focus", direction_type);
 908   scrolled_window->focus_out = FALSE;
 909
 910   g_object_unref (scrolled_window);
 911 }
 912
 913 static void
 914 gtk_scrolled_window_size_request (GtkWidget      *widget,
 915                                   GtkRequisition *requisition)
 916 {
 917   GtkScrolledWindow *scrolled_window;
 918   GtkBin *bin;
 919   gint extra_width;
 920   gint extra_height;
 921   gint scrollbar_spacing;
 922   GtkRequisition hscrollbar_requisition;
 923   GtkRequisition vscrollbar_requisition;
 924   GtkRequisition child_requisition;
 925
 926   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 927   g_return_if_fail (requisition != NULL);
 928
 929   scrolled_window = GTK_SCROLLED_WINDOW (widget);
 930   bin = GTK_BIN (scrolled_window);
 931
 932   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
 933
 934   extra_width = 0;
 935   extra_height = 0;
 936   requisition->width = 0;
 937   requisition->height = 0;
 938
 939   gtk_widget_size_request (scrolled_window->hscrollbar,
 940                            &hscrollbar_requisition);
 941   gtk_widget_size_request (scrolled_window->vscrollbar,
 942                            &vscrollbar_requisition);
 943
 944   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 945     {
 946       gtk_widget_size_request (bin->child, &child_requisition);
 947
 948       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
 949         requisition->width += child_requisition.width;
 950       else
 951         {
 952           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 953
 954           if (aux_info && aux_info->width > 0)
 955             {
 956               requisition->width += aux_info->width;
 957               extra_width = -1;
 958             }
 959           else
 960             requisition->width += vscrollbar_requisition.width;
 961         }
 962
 963       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
 964         requisition->height += child_requisition.height;
 965       else
 966         {
 967           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 968
 969           if (aux_info && aux_info->height > 0)
 970             {
 971               requisition->height += aux_info->height;
 972               extra_height = -1;
 973             }
 974           else
 975             requisition->height += hscrollbar_requisition.height;
 976         }
 977     }
 978
 979   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
 980       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 981     {
 982       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
 983       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 984         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
 985     }
 986
 987   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
 988       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 989     {
 990       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
 991       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 992         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
 993     }
 994
 995   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
 996   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
 997
 998   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 999     {
1000       requisition->width += 2 * widget->style->xthickness;
1001       requisition->height += 2 * widget->style->ythickness;
1002     }
1003 }
1004
1005 static void
1006 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1007                                          GtkAllocation *allocation)
1008 {
1009   GtkScrolledWindow *scrolled_window;
1010   gint scrollbar_spacing;
1011
1012   g_return_if_fail (widget != NULL);
1013   g_return_if_fail (allocation != NULL);
1014
1015   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1016   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1017
1018   allocation->x = GTK_CONTAINER (widget)->border_width;
1019   allocation->y = GTK_CONTAINER (widget)->border_width;
1020
1021   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1022     {
1023       allocation->x += widget->style->xthickness;
1024       allocation->y += widget->style->ythickness;
1025     }
1026
1027   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1028   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1029
1030   if (scrolled_window->vscrollbar_visible)
1031     {
1032       GtkRequisition vscrollbar_requisition;
1033       gboolean is_rtl;
1034
1035       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1036                                         &vscrollbar_requisition);
1037       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1038
1039       if ((!is_rtl &&
1040            (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
1041             scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1042           (is_rtl &&
1043            (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1044             scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)))
1045         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1046
1047       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1048     }
1049   if (scrolled_window->hscrollbar_visible)
1050     {
1051       GtkRequisition hscrollbar_requisition;
1052       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1053                                         &hscrollbar_requisition);
1054
1055       if (scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT ||
1056           scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
1057         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1058
1059       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1060     }
1061 }
1062
1063 static void
1064 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1065                                    GtkAllocation *allocation)
1066 {
1067   GtkScrolledWindow *scrolled_window;
1068   GtkBin *bin;
1069   GtkAllocation relative_allocation;
1070   GtkAllocation child_allocation;
1071   gint scrollbar_spacing;
1072
1073   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1074   g_return_if_fail (allocation != NULL);
1075
1076   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1077   bin = GTK_BIN (scrolled_window);
1078
1079   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1080
1081   widget->allocation = *allocation;
1082
1083   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1084     scrolled_window->hscrollbar_visible = TRUE;
1085   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1086     scrolled_window->hscrollbar_visible = FALSE;
1087   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1088     scrolled_window->vscrollbar_visible = TRUE;
1089   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1090     scrolled_window->vscrollbar_visible = FALSE;
1091
1092   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1093     {
1094       gboolean previous_hvis;
1095       gboolean previous_vvis;
1096       guint count = 0;
1097
1098       do
1099         {
1100           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1101
1102           child_allocation.x = relative_allocation.x + allocation->x;
1103           child_allocation.y = relative_allocation.y + allocation->y;
1104           child_allocation.width = relative_allocation.width;
1105           child_allocation.height = relative_allocation.height;
1106
1107           previous_hvis = scrolled_window->hscrollbar_visible;
1108           previous_vvis = scrolled_window->vscrollbar_visible;
1109
1110           gtk_widget_size_allocate (bin->child, &child_allocation);
1111
1112           /* If, after the first iteration, the hscrollbar and the
1113            * vscrollbar flip visiblity, then we need both.
1114            */
1115           if (count &&
1116               previous_hvis != scrolled_window->hscrollbar_visible &&
1117               previous_vvis != scrolled_window->vscrollbar_visible)
1118             {
1119               scrolled_window->hscrollbar_visible = TRUE;
1120               scrolled_window->vscrollbar_visible = TRUE;
1121
1122               /* a new resize is already queued at this point,
1123                * so we will immediatedly get reinvoked
1124                */
1125               return;
1126             }
1127
1128           count++;
1129         }
1130       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1131              previous_vvis != scrolled_window->vscrollbar_visible);
1132     }
1133   else
1134     gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1135
1136   if (scrolled_window->hscrollbar_visible)
1137     {
1138       GtkRequisition hscrollbar_requisition;
1139       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1140                                         &hscrollbar_requisition);
1141
1142       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1143         gtk_widget_show (scrolled_window->hscrollbar);
1144
1145       child_allocation.x = relative_allocation.x;
1146       if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1147           scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT)
1148         child_allocation.y = (relative_allocation.y +
1149                               relative_allocation.height +
1150                               scrollbar_spacing +
1151                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1152                                0 : widget->style->ythickness));
1153       else
1154         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1155
1156       child_allocation.width = relative_allocation.width;
1157       child_allocation.height = hscrollbar_requisition.height;
1158       child_allocation.x += allocation->x;
1159       child_allocation.y += allocation->y;
1160
1161       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1162         {
1163           child_allocation.x -= widget->style->xthickness;
1164           child_allocation.width += 2 * widget->style->xthickness;
1165         }
1166
1167       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1168     }
1169   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1170     gtk_widget_hide (scrolled_window->hscrollbar);
1171
1172   if (scrolled_window->vscrollbar_visible)
1173     {
1174       GtkRequisition vscrollbar_requisition;
1175       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1176         gtk_widget_show (scrolled_window->vscrollbar);
1177
1178       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1179                                         &vscrollbar_requisition);
1180
1181       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1182            (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
1183             scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1184           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1185            (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1186             scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)))
1187         child_allocation.x = (relative_allocation.x +
1188                               relative_allocation.width +
1189                               scrollbar_spacing +
1190                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1191                                0 : widget->style->xthickness));
1192       else
1193         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1194
1195       child_allocation.y = relative_allocation.y;
1196       child_allocation.width = vscrollbar_requisition.width;
1197       child_allocation.height = relative_allocation.height;
1198       child_allocation.x += allocation->x;
1199       child_allocation.y += allocation->y;
1200
1201       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1202         {
1203           child_allocation.y -= widget->style->ythickness;
1204           child_allocation.height += 2 * widget->style->ythickness;
1205         }
1206
1207       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1208     }
1209   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1210     gtk_widget_hide (scrolled_window->vscrollbar);
1211 }
1212
1213 static gint
1214 gtk_scrolled_window_scroll_event (GtkWidget *widget,
1215                                   GdkEventScroll *event)
1216 {
1217   GtkWidget *range;
1218
1219   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1220   g_return_val_if_fail (event != NULL, FALSE);
1221
1222   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1223     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1224   else
1225     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1226
1227   if (range && GTK_WIDGET_VISIBLE (range))
1228     {
1229       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1230       gdouble delta, new_value;
1231
1232       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1233
1234       new_value = CLAMP (adj->value + delta, adj->lower, adj->upper - adj->page_size);
1235
1236       gtk_adjustment_set_value (adj, new_value);
1237
1238       return TRUE;
1239     }
1240
1241   return FALSE;
1242 }
1243
1244 static gint
1245 gtk_scrolled_window_focus (GtkWidget        *widget,
1246                            GtkDirectionType  direction)
1247 {
1248   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1249   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1250
1251   if (scrolled_window->focus_out)
1252     {
1253       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1254       return FALSE;
1255     }
1256
1257   if (gtk_widget_is_focus (widget))
1258     return FALSE;
1259
1260   /* We only put the scrolled window itself in the focus chain if it
1261    * isn't possible to focus any children.
1262    */
1263   if (GTK_BIN (widget)->child)
1264     {
1265       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1266         return TRUE;
1267     }
1268
1269   if (!had_focus_child)
1270     {
1271       gtk_widget_grab_focus (widget);
1272       return TRUE;
1273     }
1274   else
1275     return FALSE;
1276 }
1277
1278 static void
1279 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1280                                         gpointer       data)
1281 {
1282   GtkScrolledWindow *scrolled_win;
1283
1284   g_return_if_fail (adjustment != NULL);
1285   g_return_if_fail (data != NULL);
1286
1287   scrolled_win = GTK_SCROLLED_WINDOW (data);
1288
1289   if (scrolled_win->hscrollbar &&
1290       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1291     {
1292       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1293         {
1294           gboolean visible;
1295
1296           visible = scrolled_win->hscrollbar_visible;
1297           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1298                                               adjustment->page_size);
1299           if (scrolled_win->hscrollbar_visible != visible)
1300             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1301         }
1302     }
1303   else if (scrolled_win->vscrollbar &&
1304            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1305     {
1306       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1307         {
1308           gboolean visible;
1309
1310           visible = scrolled_win->vscrollbar_visible;
1311           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1312                                               adjustment->page_size);
1313           if (scrolled_win->vscrollbar_visible != visible)
1314             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1315         }
1316     }
1317 }
1318
1319 static void
1320 gtk_scrolled_window_add (GtkContainer *container,
1321                          GtkWidget    *child)
1322 {
1323   GtkScrolledWindow *scrolled_window;
1324   GtkBin *bin;
1325
1326   bin = GTK_BIN (container);
1327   g_return_if_fail (bin->child == NULL);
1328
1329   scrolled_window = GTK_SCROLLED_WINDOW (container);
1330
1331   bin->child = child;
1332   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1333
1334   /* this is a temporary message */
1335   if (!gtk_widget_set_scroll_adjustments (child,
1336                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1337                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1338     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1339                "use gtk_scrolled_window_add_with_viewport() instead");
1340 }
1341
1342 static void
1343 gtk_scrolled_window_remove (GtkContainer *container,
1344                             GtkWidget    *child)
1345 {
1346   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1347   g_return_if_fail (child != NULL);
1348   g_return_if_fail (GTK_BIN (container)->child == child);
1349
1350   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1351
1352   /* chain parent class handler to remove child */
1353   GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
1354 }
1355
1356 void
1357 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1358                                        GtkWidget         *child)
1359 {
1360   GtkBin *bin;
1361   GtkWidget *viewport;
1362
1363   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1364   g_return_if_fail (GTK_IS_WIDGET (child));
1365   g_return_if_fail (child->parent == NULL);
1366
1367   bin = GTK_BIN (scrolled_window);
1368
1369   if (bin->child != NULL)
1370     {
1371       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1372       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1373
1374       viewport = bin->child;
1375     }
1376   else
1377     {
1378       viewport =
1379         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1380                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1381       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1382     }
1383
1384   gtk_widget_show (viewport);
1385   gtk_container_add (GTK_CONTAINER (viewport), child);
1386 }
1387
1388 /**
1389  * _gtk_scrolled_window_get_spacing:
1390  * @scrolled_window: a scrolled window
1391  *
1392  * Gets the spacing between the scrolled window's scrollbars and
1393  * the scrolled widget. Used by GtkCombo
1394  *
1395  * Return value: the spacing, in pixels.
1396  **/
1397 gint
1398 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1399 {
1400   GtkScrolledWindowClass *class;
1401
1402   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1403
1404   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1405
1406   if (class->scrollbar_spacing >= 0)
1407     return class->scrollbar_spacing;
1408   else
1409     {
1410       gint scrollbar_spacing;
1411
1412       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1413                             "scrollbar_spacing", &scrollbar_spacing,
1414                             NULL);
1415
1416       return scrollbar_spacing;
1417     }
1418 }