Pileus Git - ~andy/gtk/blob - gtk/gtkscrolledwindow.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include <config.h>
  28 #include <math.h>
  29 #include <gdk/gdkkeysyms.h>
  30 #include "gtkbindings.h"
  31 #include "gtkmarshalers.h"
  32 #include "gtkscrolledwindow.h"
  33 #include "gtkwindow.h"
  34 #include "gtkprivate.h"
  35 #include "gtkintl.h"
  36 #include "gtkalias.h"
  37
  38
  39 /* scrolled window policy and size requisition handling:
  40  *
  41  * gtk size requisition works as follows:
  42  *   a widget upon size-request reports the width and height that it finds
  43  *   to be best suited to display its contents, including children.
  44  *   the width and/or height reported from a widget upon size requisition
  45  *   may be overidden by the user by specifying a width and/or height
  46  *   other than 0 through gtk_widget_set_usize().
  47  *
  48  * a scrolled window needs (for imlementing all three policy types) to
  49  * request its width and height based on two different rationales.
  50  * 1)   the user wants the scrolled window to just fit into the space
  51  *      that it gets allocated for a specifc dimension.
  52  * 1.1) this does not apply if the user specified a concrete value
  53  *      value for that specific dimension by either specifying usize for the
  54  *      scrolled window or for its child.
  55  * 2)   the user wants the scrolled window to take as much space up as
  56  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
  57  *
  58  * also, kinda obvious:
  59  * 3)   a user would certainly not have choosen a scrolled window as a container
  60  *      for the child, if the resulting allocation takes up more space than the
  61  *      child would have allocated without the scrolled window.
  62  *
  63  * conclusions:
  64  * A) from 1) follows: the scrolled window shouldn't request more space for a
  65  *    specifc dimension than is required at minimum.
  66  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
  67  *    window (done automatically) or by usize of the child (needs to be checked).
  68  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
  69  *    child's dimension.
  70  * D) from 3) follows: the scrolled window child's minimum width and minimum height
  71  *    under A) at least correspond to the space taken up by its scrollbars.
  72  */
  73
  74 #define DEFAULT_SCROLLBAR_SPACING  3
  75
  76 typedef struct {
  77         gboolean window_placement_set;
  78         GtkCornerType real_window_placement;
  79 } GtkScrolledWindowPrivate;
  80
  81 #define GTK_SCROLLED_WINDOW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_SCROLLED_WINDOW, GtkScrolledWindowPrivate))
  82
  83 enum {
  84   PROP_0,
  85   PROP_HADJUSTMENT,
  86   PROP_VADJUSTMENT,
  87   PROP_HSCROLLBAR_POLICY,
  88   PROP_VSCROLLBAR_POLICY,
  89   PROP_WINDOW_PLACEMENT,
  90   PROP_WINDOW_PLACEMENT_SET,
  91   PROP_SHADOW_TYPE,
  92   PROP_LAST
  93 };
  94
  95 /* Signals */
  96 enum
  97 {
  98   SCROLL_CHILD,
  99   MOVE_FOCUS_OUT,
 100   LAST_SIGNAL
 101 };
 102
 103 static void gtk_scrolled_window_destroy            (GtkObject              *object);
 104 static void gtk_scrolled_window_finalize           (GObject                *object);
 105 static void gtk_scrolled_window_set_property       (GObject                *object,
 106                                                     guint                   prop_id,
 107                                                     const GValue           *value,
 108                                                     GParamSpec             *pspec);
 109 static void gtk_scrolled_window_get_property       (GObject                *object,
 110                                                     guint                   prop_id,
 111                                                     GValue                 *value,
 112                                                     GParamSpec             *pspec);
 113
 114 static void gtk_scrolled_window_screen_changed     (GtkWidget              *widget,
 115                                                     GdkScreen              *previous_screen);
 116 static gint gtk_scrolled_window_expose             (GtkWidget              *widget,
 117                                                     GdkEventExpose         *event);
 118 static void gtk_scrolled_window_size_request       (GtkWidget              *widget,
 119                                                     GtkRequisition         *requisition);
 120 static void gtk_scrolled_window_size_allocate      (GtkWidget              *widget,
 121                                                     GtkAllocation          *allocation);
 122 static gint gtk_scrolled_window_scroll_event       (GtkWidget              *widget,
 123                                                     GdkEventScroll         *event);
 124 static gint gtk_scrolled_window_focus              (GtkWidget              *widget,
 125                                                     GtkDirectionType        direction);
 126 static void gtk_scrolled_window_add                (GtkContainer           *container,
 127                                                     GtkWidget              *widget);
 128 static void gtk_scrolled_window_remove             (GtkContainer           *container,
 129                                                     GtkWidget              *widget);
 130 static void gtk_scrolled_window_forall             (GtkContainer           *container,
 131                                                     gboolean                include_internals,
 132                                                     GtkCallback             callback,
 133                                                     gpointer                callback_data);
 134 static void gtk_scrolled_window_scroll_child       (GtkScrolledWindow      *scrolled_window,
 135                                                     GtkScrollType           scroll,
 136                                                     gboolean                horizontal);
 137 static void gtk_scrolled_window_move_focus_out     (GtkScrolledWindow      *scrolled_window,
 138                                                     GtkDirectionType        direction_type);
 139
 140 static void gtk_scrolled_window_relative_allocation(GtkWidget              *widget,
 141                                                     GtkAllocation          *allocation);
 142 static void gtk_scrolled_window_adjustment_changed (GtkAdjustment          *adjustment,
 143                                                     gpointer                data);
 144
 145 static void gtk_scrolled_window_update_real_placement (GtkScrolledWindow   *scrolled_window);
 146
 147 static guint signals[LAST_SIGNAL] = {0};
 148
 149 G_DEFINE_TYPE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN)
 150
 151 static void
 152 add_scroll_binding (GtkBindingSet  *binding_set,
 153                     guint           keyval,
 154                     GdkModifierType mask,
 155                     GtkScrollType   scroll,
 156                     gboolean        horizontal)
 157 {
 158   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 159
 160   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 161                                 "scroll_child", 2,
 162                                 GTK_TYPE_SCROLL_TYPE, scroll,
 163                                 G_TYPE_BOOLEAN, horizontal);
 164   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 165                                 "scroll_child", 2,
 166                                 GTK_TYPE_SCROLL_TYPE, scroll,
 167                                 G_TYPE_BOOLEAN, horizontal);
 168 }
 169
 170 static void
 171 add_tab_bindings (GtkBindingSet    *binding_set,
 172                   GdkModifierType   modifiers,
 173                   GtkDirectionType  direction)
 174 {
 175   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 176                                 "move_focus_out", 1,
 177                                 GTK_TYPE_DIRECTION_TYPE, direction);
 178   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 179                                 "move_focus_out", 1,
 180                                 GTK_TYPE_DIRECTION_TYPE, direction);
 181 }
 182
 183 static void
 184 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 185 {
 186   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 187   GtkObjectClass *object_class;
 188   GtkWidgetClass *widget_class;
 189   GtkContainerClass *container_class;
 190   GtkBindingSet *binding_set;
 191
 192   object_class = (GtkObjectClass*) class;
 193   widget_class = (GtkWidgetClass*) class;
 194   container_class = (GtkContainerClass*) class;
 195
 196   gobject_class->finalize = gtk_scrolled_window_finalize;
 197   gobject_class->set_property = gtk_scrolled_window_set_property;
 198   gobject_class->get_property = gtk_scrolled_window_get_property;
 199
 200   object_class->destroy = gtk_scrolled_window_destroy;
 201
 202   widget_class->screen_changed = gtk_scrolled_window_screen_changed;
 203   widget_class->expose_event = gtk_scrolled_window_expose;
 204   widget_class->size_request = gtk_scrolled_window_size_request;
 205   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 206   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 207   widget_class->focus = gtk_scrolled_window_focus;
 208
 209   container_class->add = gtk_scrolled_window_add;
 210   container_class->remove = gtk_scrolled_window_remove;
 211   container_class->forall = gtk_scrolled_window_forall;
 212
 213   class->scrollbar_spacing = -1;
 214
 215   class->scroll_child = gtk_scrolled_window_scroll_child;
 216   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 217
 218   g_object_class_install_property (gobject_class,
 219                                    PROP_HADJUSTMENT,
 220                                    g_param_spec_object ("hadjustment",
 221                                                         P_("Horizontal Adjustment"),
 222                                                         P_("The GtkAdjustment for the horizontal position"),
 223                                                         GTK_TYPE_ADJUSTMENT,
 224                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 225   g_object_class_install_property (gobject_class,
 226                                    PROP_VADJUSTMENT,
 227                                    g_param_spec_object ("vadjustment",
 228                                                         P_("Vertical Adjustment"),
 229                                                         P_("The GtkAdjustment for the vertical position"),
 230                                                         GTK_TYPE_ADJUSTMENT,
 231                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 232   g_object_class_install_property (gobject_class,
 233                                    PROP_HSCROLLBAR_POLICY,
 234                                    g_param_spec_enum ("hscrollbar-policy",
 235                                                       P_("Horizontal Scrollbar Policy"),
 236                                                       P_("When the horizontal scrollbar is displayed"),
 237                                                       GTK_TYPE_POLICY_TYPE,
 238                                                       GTK_POLICY_ALWAYS,
 239                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 240   g_object_class_install_property (gobject_class,
 241                                    PROP_VSCROLLBAR_POLICY,
 242                                    g_param_spec_enum ("vscrollbar-policy",
 243                                                       P_("Vertical Scrollbar Policy"),
 244                                                       P_("When the vertical scrollbar is displayed"),
 245                                                       GTK_TYPE_POLICY_TYPE,
 246                                                       GTK_POLICY_ALWAYS,
 247                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 248
 249   g_object_class_install_property (gobject_class,
 250                                    PROP_WINDOW_PLACEMENT,
 251                                    g_param_spec_enum ("window-placement",
 252                                                       P_("Window Placement"),
 253                                                       P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
 254                                                       GTK_TYPE_CORNER_TYPE,
 255                                                       GTK_CORNER_TOP_LEFT,
 256                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 257
 258   /**
 259    * GtkScrolledWindow:window-placement-set:
 260    *
 261    * Whether "window-placement" should be used to determine the location
 262    * of the contents with respect to the scrollbars. Otherwise, the
 263    * "gtk-scrolled-window-placement" setting is used.
 264    *
 265    * Since: 2.10
 266    */
 267   g_object_class_install_property (gobject_class,
 268                                    PROP_WINDOW_PLACEMENT_SET,
 269                                    g_param_spec_boolean ("window-placement-set",
 270                                                          P_("Window Placement Set"),
 271                                                          P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
 272                                                          FALSE,
 273                                                          GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 274   g_object_class_install_property (gobject_class,
 275                                    PROP_SHADOW_TYPE,
 276                                    g_param_spec_enum ("shadow-type",
 277                                                       P_("Shadow Type"),
 278                                                       P_("Style of bevel around the contents"),
 279                                                       GTK_TYPE_SHADOW_TYPE,
 280                                                       GTK_SHADOW_NONE,
 281                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 282
 283   gtk_widget_class_install_style_property (widget_class,
 284                                            g_param_spec_int ("scrollbar-spacing",
 285                                                              P_("Scrollbar spacing"),
 286                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 287                                                              0,
 288                                                              G_MAXINT,
 289                                                              DEFAULT_SCROLLBAR_SPACING,
 290                                                              GTK_PARAM_READABLE));
 291
 292   /**
 293    * GtkSettings:gtk-scrolled-window-placement:
 294    *
 295    * Where the contents of scrolled windows are located with respect to the
 296    * scrollbars, if not overridden by the scrolled window's own placement.
 297    *
 298    * Since: 2.10
 299    */
 300   gtk_settings_install_property (g_param_spec_enum ("gtk-scrolled-window-placement",
 301                                                     P_("Scrolled Window Placement"),
 302                                                     P_("Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement."),
 303                                                     GTK_TYPE_CORNER_TYPE,
 304                                                     GTK_CORNER_TOP_LEFT,
 305                                                     G_PARAM_READABLE | G_PARAM_WRITABLE));
 306
 307
 308   signals[SCROLL_CHILD] =
 309     g_signal_new (I_("scroll_child"),
 310                   G_TYPE_FROM_CLASS (object_class),
 311                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 312                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 313                   NULL, NULL,
 314                   _gtk_marshal_VOID__ENUM_BOOLEAN,
 315                   G_TYPE_NONE, 2,
 316                   GTK_TYPE_SCROLL_TYPE,
 317                   G_TYPE_BOOLEAN);
 318   signals[MOVE_FOCUS_OUT] =
 319     g_signal_new (I_("move_focus_out"),
 320                   G_TYPE_FROM_CLASS (object_class),
 321                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 322                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 323                   NULL, NULL,
 324                   _gtk_marshal_VOID__ENUM,
 325                   G_TYPE_NONE, 1,
 326                   GTK_TYPE_DIRECTION_TYPE);
 327
 328   binding_set = gtk_binding_set_by_class (class);
 329
 330   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 331   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 332   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 333   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 334
 335   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 336   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 337   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 338   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 339
 340   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 341   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 342   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, FALSE);
 343   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   FALSE);
 344
 345   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 346   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 347
 348   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 349 }
 350
 351 static void
 352 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 353 {
 354   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 355
 356   scrolled_window->hscrollbar = NULL;
 357   scrolled_window->vscrollbar = NULL;
 358   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 359   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 360   scrolled_window->hscrollbar_visible = FALSE;
 361   scrolled_window->vscrollbar_visible = FALSE;
 362   scrolled_window->focus_out = FALSE;
 363   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 364   gtk_scrolled_window_update_real_placement (scrolled_window);
 365 }
 366
 367 GtkWidget*
 368 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 369                          GtkAdjustment *vadjustment)
 370 {
 371   GtkWidget *scrolled_window;
 372
 373   if (hadjustment)
 374     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 375
 376   if (vadjustment)
 377     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 378
 379   scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
 380                                     "hadjustment", hadjustment,
 381                                     "vadjustment", vadjustment,
 382                                     NULL);
 383
 384   return scrolled_window;
 385 }
 386
 387 void
 388 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 389                                      GtkAdjustment     *hadjustment)
 390 {
 391   GtkBin *bin;
 392
 393   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 394   if (hadjustment)
 395     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 396   else
 397     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 398
 399   bin = GTK_BIN (scrolled_window);
 400
 401   if (!scrolled_window->hscrollbar)
 402     {
 403       gtk_widget_push_composite_child ();
 404       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 405       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 406       gtk_widget_pop_composite_child ();
 407
 408       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 409       g_object_ref (scrolled_window->hscrollbar);
 410       gtk_widget_show (scrolled_window->hscrollbar);
 411     }
 412   else
 413     {
 414       GtkAdjustment *old_adjustment;
 415
 416       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 417       if (old_adjustment == hadjustment)
 418         return;
 419
 420       g_signal_handlers_disconnect_by_func (old_adjustment,
 421                                             gtk_scrolled_window_adjustment_changed,
 422                                             scrolled_window);
 423       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 424                                 hadjustment);
 425     }
 426   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 427   g_signal_connect (hadjustment,
 428                     "changed",
 429                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 430                     scrolled_window);
 431   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 432
 433   if (bin->child)
 434     gtk_widget_set_scroll_adjustments (bin->child,
 435                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 436                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 437
 438   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 439 }
 440
 441 void
 442 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 443                                      GtkAdjustment     *vadjustment)
 444 {
 445   GtkBin *bin;
 446
 447   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 448   if (vadjustment)
 449     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 450   else
 451     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 452
 453   bin = GTK_BIN (scrolled_window);
 454
 455   if (!scrolled_window->vscrollbar)
 456     {
 457       gtk_widget_push_composite_child ();
 458       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 459       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 460       gtk_widget_pop_composite_child ();
 461
 462       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 463       g_object_ref (scrolled_window->vscrollbar);
 464       gtk_widget_show (scrolled_window->vscrollbar);
 465     }
 466   else
 467     {
 468       GtkAdjustment *old_adjustment;
 469
 470       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 471       if (old_adjustment == vadjustment)
 472         return;
 473
 474       g_signal_handlers_disconnect_by_func (old_adjustment,
 475                                             gtk_scrolled_window_adjustment_changed,
 476                                             scrolled_window);
 477       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 478                                 vadjustment);
 479     }
 480   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 481   g_signal_connect (vadjustment,
 482                     "changed",
 483                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 484                     scrolled_window);
 485   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 486
 487   if (bin->child)
 488     gtk_widget_set_scroll_adjustments (bin->child,
 489                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 490                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 491
 492   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 493 }
 494
 495 GtkAdjustment*
 496 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 497 {
 498   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 499
 500   return (scrolled_window->hscrollbar ?
 501           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 502           NULL);
 503 }
 504
 505 GtkAdjustment*
 506 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 507 {
 508   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 509
 510   return (scrolled_window->vscrollbar ?
 511           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 512           NULL);
 513 }
 514
 515 /**
 516  * gtk_scrolled_window_get_hscrollbar:
 517  * @scrolled_window: a #GtkScrolledWindow
 518  *
 519  * Returns the horizontal scrollbar of @scrolled_window.
 520  *
 521  * Returns: the horizontal scrollbar of the scrolled window, or
 522  *  %NULL if it does not have one.
 523  *
 524  * Since: 2.8
 525  */
 526 GtkWidget*
 527 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 528 {
 529   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 530
 531   return scrolled_window->hscrollbar;
 532 }
 533
 534 /**
 535  * gtk_scrolled_window_get_vscrollbar:
 536  * @scrolled_window: a #GtkScrolledWindow
 537  *
 538  * Returns the vertical scrollbar of @scrolled_window.
 539  *
 540  * Returns: the vertical scrollbar of the scrolled window, or
 541  *  %NULL if it does not have one.
 542  *
 543  * Since: 2.8
 544  */
 545 GtkWidget*
 546 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 547 {
 548   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 549
 550   return scrolled_window->vscrollbar;
 551 }
 552
 553 void
 554 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 555                                 GtkPolicyType      hscrollbar_policy,
 556                                 GtkPolicyType      vscrollbar_policy)
 557 {
 558   GObject *object = G_OBJECT (scrolled_window);
 559
 560   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 561
 562   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 563       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 564     {
 565       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 566       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 567
 568       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 569
 570       g_object_freeze_notify (object);
 571       g_object_notify (object, "hscrollbar-policy");
 572       g_object_notify (object, "vscrollbar-policy");
 573       g_object_thaw_notify (object);
 574     }
 575 }
 576
 577 /**
 578  * gtk_scrolled_window_get_policy:
 579  * @scrolled_window: a #GtkScrolledWindow
 580  * @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 581  * @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 582  *
 583  * Retrieves the current policy values for the horizontal and vertical
 584  * scrollbars. See gtk_scrolled_window_set_policy().
 585  **/
 586 void
 587 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 588                                 GtkPolicyType     *hscrollbar_policy,
 589                                 GtkPolicyType     *vscrollbar_policy)
 590 {
 591   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 592
 593   if (hscrollbar_policy)
 594     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 595   if (vscrollbar_policy)
 596     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 597 }
 598
 599 static void
 600 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 601 {
 602   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 603   GtkSettings *settings;
 604
 605   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 606
 607   if (priv->window_placement_set || settings == NULL)
 608     priv->real_window_placement = scrolled_window->window_placement;
 609   else
 610     g_object_get (settings,
 611                   "gtk-scrolled-window-placement",
 612                   &priv->real_window_placement,
 613                   NULL);
 614 }
 615
 616 static void
 617 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 618                                             GtkCornerType      window_placement)
 619 {
 620   if (scrolled_window->window_placement != window_placement)
 621     {
 622       scrolled_window->window_placement = window_placement;
 623
 624       gtk_scrolled_window_update_real_placement (scrolled_window);
 625       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 626
 627       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 628     }
 629 }
 630
 631 static void
 632 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 633                                        gboolean           placement_set,
 634                                        gboolean           emit_resize)
 635 {
 636   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 637
 638   if (priv->window_placement_set != placement_set)
 639     {
 640       priv->window_placement_set = placement_set;
 641
 642       gtk_scrolled_window_update_real_placement (scrolled_window);
 643       if (emit_resize)
 644         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 645
 646       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 647     }
 648 }
 649
 650 /**
 651  * gtk_scrolled_window_set_placement:
 652  * @scrolled_window: a #GtkScrolledWindow
 653  *
 654  * Sets the placement of the contents with respect to the scrollbars
 655  * for the scrolled window.
 656  *
 657  * See also gtk_scrolled_window_get_placement() and
 658  * gtk_scrolled_window_unset_placement().
 659  **/
 660 void
 661 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 662                                    GtkCornerType      window_placement)
 663 {
 664   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 665
 666   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 667   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 668 }
 669
 670 /**
 671  * gtk_scrolled_window_get_placement:
 672  * @scrolled_window: a #GtkScrolledWindow
 673  *
 674  * Gets the placement of the contents with respect to the scrollbars
 675  * for the scrolled window. See gtk_scrolled_window_set_placement().
 676  *
 677  * Return value: the current placement value.
 678  *
 679  * See also gtk_scrolled_window_set_placement() and
 680  * gtk_scrolled_window_unset_placement().
 681  **/
 682 GtkCornerType
 683 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 684 {
 685   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 686
 687   return scrolled_window->window_placement;
 688 }
 689
 690 /**
 691  * gtk_scrolled_window_unset_placement:
 692  * @scrolled_window: a #GtkScrolledWindow
 693  *
 694  * Unsets the placement of the contents with respect to the scrollbars
 695  * for the scrolled window. If no window placement is set for a scrolled
 696  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 697  *
 698  * See also gtk_scrolled_window_set_placement() and
 699  * gtk_scrolled_window_get_placement().
 700  *
 701  * Since: 2.10
 702  **/
 703 void
 704 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 705 {
 706   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 707
 708   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 709
 710   if (priv->window_placement_set)
 711     {
 712       priv->window_placement_set = FALSE;
 713
 714       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 715
 716       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 717     }
 718 }
 719
 720 /**
 721  * gtk_scrolled_window_set_shadow_type:
 722  * @scrolled_window: a #GtkScrolledWindow
 723  * @type: kind of shadow to draw around scrolled window contents
 724  *
 725  * Changes the type of shadow drawn around the contents of
 726  * @scrolled_window.
 727  *
 728  **/
 729 void
 730 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 731                                      GtkShadowType      type)
 732 {
 733   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 734   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 735
 736   if (scrolled_window->shadow_type != type)
 737     {
 738       scrolled_window->shadow_type = type;
 739
 740       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 741         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 742
 743       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 744
 745       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 746     }
 747 }
 748
 749 /**
 750  * gtk_scrolled_window_get_shadow_type:
 751  * @scrolled_window: a #GtkScrolledWindow
 752  *
 753  * Gets the shadow type of the scrolled window. See
 754  * gtk_scrolled_window_set_shadow_type().
 755  *
 756  * Return value: the current shadow type
 757  **/
 758 GtkShadowType
 759 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 760 {
 761   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 762
 763   return scrolled_window->shadow_type;
 764 }
 765
 766 static void
 767 gtk_scrolled_window_destroy (GtkObject *object)
 768 {
 769   GtkScrolledWindow *scrolled_window;
 770
 771   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
 772
 773   scrolled_window = GTK_SCROLLED_WINDOW (object);
 774
 775   gtk_widget_unparent (scrolled_window->hscrollbar);
 776   gtk_widget_unparent (scrolled_window->vscrollbar);
 777   gtk_widget_destroy (scrolled_window->hscrollbar);
 778   gtk_widget_destroy (scrolled_window->vscrollbar);
 779
 780   GTK_OBJECT_CLASS (gtk_scrolled_window_parent_class)->destroy (object);
 781 }
 782
 783 static void
 784 gtk_scrolled_window_finalize (GObject *object)
 785 {
 786   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 787
 788   g_object_unref (scrolled_window->hscrollbar);
 789   g_object_unref (scrolled_window->vscrollbar);
 790
 791   G_OBJECT_CLASS (gtk_scrolled_window_parent_class)->finalize (object);
 792 }
 793
 794 static void
 795 gtk_scrolled_window_set_property (GObject      *object,
 796                                   guint         prop_id,
 797                                   const GValue *value,
 798                                   GParamSpec   *pspec)
 799 {
 800   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 801
 802   switch (prop_id)
 803     {
 804     case PROP_HADJUSTMENT:
 805       gtk_scrolled_window_set_hadjustment (scrolled_window,
 806                                            g_value_get_object (value));
 807       break;
 808     case PROP_VADJUSTMENT:
 809       gtk_scrolled_window_set_vadjustment (scrolled_window,
 810                                            g_value_get_object (value));
 811       break;
 812     case PROP_HSCROLLBAR_POLICY:
 813       gtk_scrolled_window_set_policy (scrolled_window,
 814                                       g_value_get_enum (value),
 815                                       scrolled_window->vscrollbar_policy);
 816       break;
 817     case PROP_VSCROLLBAR_POLICY:
 818       gtk_scrolled_window_set_policy (scrolled_window,
 819                                       scrolled_window->hscrollbar_policy,
 820                                       g_value_get_enum (value));
 821       break;
 822     case PROP_WINDOW_PLACEMENT:
 823       gtk_scrolled_window_set_placement_internal (scrolled_window,
 824                                                   g_value_get_enum (value));
 825       break;
 826     case PROP_WINDOW_PLACEMENT_SET:
 827       gtk_scrolled_window_set_placement_set (scrolled_window,
 828                                              g_value_get_enum (value),
 829                                              TRUE);
 830       break;
 831     case PROP_SHADOW_TYPE:
 832       gtk_scrolled_window_set_shadow_type (scrolled_window,
 833                                            g_value_get_enum (value));
 834       break;
 835     default:
 836       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 837       break;
 838     }
 839 }
 840
 841 static void
 842 gtk_scrolled_window_get_property (GObject    *object,
 843                                   guint       prop_id,
 844                                   GValue     *value,
 845                                   GParamSpec *pspec)
 846 {
 847   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 848   GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
 849
 850   switch (prop_id)
 851     {
 852     case PROP_HADJUSTMENT:
 853       g_value_set_object (value,
 854                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 855       break;
 856     case PROP_VADJUSTMENT:
 857       g_value_set_object (value,
 858                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 859       break;
 860     case PROP_HSCROLLBAR_POLICY:
 861       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 862       break;
 863     case PROP_VSCROLLBAR_POLICY:
 864       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 865       break;
 866     case PROP_WINDOW_PLACEMENT:
 867       g_value_set_enum (value, scrolled_window->window_placement);
 868       break;
 869     case PROP_WINDOW_PLACEMENT_SET:
 870       g_value_set_boolean (value, priv->window_placement_set);
 871       break;
 872     case PROP_SHADOW_TYPE:
 873       g_value_set_enum (value, scrolled_window->shadow_type);
 874       break;
 875     default:
 876       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 877       break;
 878     }
 879 }
 880
 881 static void
 882 traverse_container (GtkWidget *widget,
 883                     gpointer   data)
 884 {
 885   if (GTK_IS_SCROLLED_WINDOW (widget))
 886     {
 887       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 888       gtk_widget_queue_draw (widget);
 889     }
 890   else if (GTK_IS_CONTAINER (widget))
 891     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
 892 }
 893
 894 static void
 895 gtk_scrolled_window_settings_changed (GtkSettings *settings)
 896 {
 897   GList *list, *l;
 898
 899   list = gtk_window_list_toplevels ();
 900
 901   for (l = list; l; l = l->next)
 902     gtk_container_forall (GTK_CONTAINER (l->data),
 903                           traverse_container, NULL);
 904
 905   g_list_free (list);
 906 }
 907
 908 static void
 909 gtk_scrolled_window_screen_changed (GtkWidget *widget,
 910                                     GdkScreen *previous_screen)
 911 {
 912   GtkSettings *settings;
 913   guint window_placement_connection;
 914
 915   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
 916
 917   if (!gtk_widget_has_screen (widget))
 918     return;
 919
 920   settings = gtk_widget_get_settings (widget);
 921
 922   window_placement_connection =
 923     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
 924                                          "gtk-scrolled-window-connection"));
 925
 926   if (window_placement_connection)
 927     return;
 928
 929   window_placement_connection =
 930     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
 931                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
 932   g_object_set_data (G_OBJECT (settings),
 933                      I_("gtk-scrolled-window-connection"),
 934                      GUINT_TO_POINTER (window_placement_connection));
 935 }
 936
 937 static void
 938 gtk_scrolled_window_paint (GtkWidget    *widget,
 939                            GdkRectangle *area)
 940 {
 941   GtkAllocation relative_allocation;
 942   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 943
 944   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 945     {
 946       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
 947
 948       relative_allocation.x -= widget->style->xthickness;
 949       relative_allocation.y -= widget->style->ythickness;
 950       relative_allocation.width += 2 * widget->style->xthickness;
 951       relative_allocation.height += 2 * widget->style->ythickness;
 952
 953       gtk_paint_shadow (widget->style, widget->window,
 954                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
 955                         area, widget, "scrolled_window",
 956                         widget->allocation.x + relative_allocation.x,
 957                         widget->allocation.y + relative_allocation.y,
 958                         relative_allocation.width,
 959                         relative_allocation.height);
 960     }
 961 }
 962
 963 static gint
 964 gtk_scrolled_window_expose (GtkWidget      *widget,
 965                             GdkEventExpose *event)
 966 {
 967   if (GTK_WIDGET_DRAWABLE (widget))
 968     {
 969       gtk_scrolled_window_paint (widget, &event->area);
 970
 971       (* GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->expose_event) (widget, event);
 972     }
 973
 974   return FALSE;
 975 }
 976
 977 static void
 978 gtk_scrolled_window_forall (GtkContainer *container,
 979                             gboolean      include_internals,
 980                             GtkCallback   callback,
 981                             gpointer      callback_data)
 982 {
 983   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 984   g_return_if_fail (callback != NULL);
 985
 986   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
 987                                               include_internals,
 988                                               callback,
 989                                               callback_data);
 990   if (include_internals)
 991     {
 992       GtkScrolledWindow *scrolled_window;
 993
 994       scrolled_window = GTK_SCROLLED_WINDOW (container);
 995
 996       if (scrolled_window->vscrollbar)
 997         callback (scrolled_window->vscrollbar, callback_data);
 998       if (scrolled_window->hscrollbar)
 999         callback (scrolled_window->hscrollbar, callback_data);
1000     }
1001 }
1002
1003 static void
1004 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1005                                   GtkScrollType      scroll,
1006                                   gboolean           horizontal)
1007 {
1008   GtkAdjustment *adjustment = NULL;
1009
1010   switch (scroll)
1011     {
1012     case GTK_SCROLL_STEP_UP:
1013       scroll = GTK_SCROLL_STEP_BACKWARD;
1014       horizontal = FALSE;
1015       break;
1016     case GTK_SCROLL_STEP_DOWN:
1017       scroll = GTK_SCROLL_STEP_FORWARD;
1018       horizontal = FALSE;
1019       break;
1020     case GTK_SCROLL_STEP_LEFT:
1021       scroll = GTK_SCROLL_STEP_BACKWARD;
1022       horizontal = TRUE;
1023       break;
1024     case GTK_SCROLL_STEP_RIGHT:
1025       scroll = GTK_SCROLL_STEP_FORWARD;
1026       horizontal = TRUE;
1027       break;
1028     case GTK_SCROLL_PAGE_UP:
1029       scroll = GTK_SCROLL_PAGE_BACKWARD;
1030       horizontal = FALSE;
1031       break;
1032     case GTK_SCROLL_PAGE_DOWN:
1033       scroll = GTK_SCROLL_PAGE_FORWARD;
1034       horizontal = FALSE;
1035       break;
1036     case GTK_SCROLL_PAGE_LEFT:
1037       scroll = GTK_SCROLL_STEP_BACKWARD;
1038       horizontal = TRUE;
1039       break;
1040     case GTK_SCROLL_PAGE_RIGHT:
1041       scroll = GTK_SCROLL_STEP_FORWARD;
1042       horizontal = TRUE;
1043       break;
1044     case GTK_SCROLL_STEP_BACKWARD:
1045     case GTK_SCROLL_STEP_FORWARD:
1046     case GTK_SCROLL_PAGE_BACKWARD:
1047     case GTK_SCROLL_PAGE_FORWARD:
1048     case GTK_SCROLL_START:
1049     case GTK_SCROLL_END:
1050       break;
1051     default:
1052       g_warning ("Invalid scroll type %u for GtkSpinButton::change-value", scroll);
1053       return;
1054     }
1055
1056   if (horizontal)
1057     {
1058       if (scrolled_window->hscrollbar)
1059         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
1060     }
1061   else
1062     {
1063       if (scrolled_window->vscrollbar)
1064         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
1065     }
1066
1067   if (adjustment)
1068     {
1069       gdouble value = adjustment->value;
1070
1071       switch (scroll)
1072         {
1073         case GTK_SCROLL_STEP_FORWARD:
1074           value += adjustment->step_increment;
1075           break;
1076         case GTK_SCROLL_STEP_BACKWARD:
1077           value -= adjustment->step_increment;
1078           break;
1079         case GTK_SCROLL_PAGE_FORWARD:
1080           value += adjustment->page_increment;
1081           break;
1082         case GTK_SCROLL_PAGE_BACKWARD:
1083           value -= adjustment->page_increment;
1084           break;
1085         case GTK_SCROLL_START:
1086           value = adjustment->lower;
1087           break;
1088         case GTK_SCROLL_END:
1089           value = adjustment->upper;
1090           break;
1091         default:
1092           g_assert_not_reached ();
1093           break;
1094         }
1095
1096       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
1097
1098       gtk_adjustment_set_value (adjustment, value);
1099     }
1100 }
1101
1102 static void
1103 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1104                                     GtkDirectionType   direction_type)
1105 {
1106   GtkWidget *toplevel;
1107
1108   /* Focus out of the scrolled window entirely. We do this by setting
1109    * a flag, then propagating the focus motion to the notebook.
1110    */
1111   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1112   if (!GTK_WIDGET_TOPLEVEL (toplevel))
1113     return;
1114
1115   g_object_ref (scrolled_window);
1116
1117   scrolled_window->focus_out = TRUE;
1118   g_signal_emit_by_name (toplevel, "move_focus", direction_type);
1119   scrolled_window->focus_out = FALSE;
1120
1121   g_object_unref (scrolled_window);
1122 }
1123
1124 static void
1125 gtk_scrolled_window_size_request (GtkWidget      *widget,
1126                                   GtkRequisition *requisition)
1127 {
1128   GtkScrolledWindow *scrolled_window;
1129   GtkBin *bin;
1130   gint extra_width;
1131   gint extra_height;
1132   gint scrollbar_spacing;
1133   GtkRequisition hscrollbar_requisition;
1134   GtkRequisition vscrollbar_requisition;
1135   GtkRequisition child_requisition;
1136
1137   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1138   g_return_if_fail (requisition != NULL);
1139
1140   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1141   bin = GTK_BIN (scrolled_window);
1142
1143   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1144
1145   extra_width = 0;
1146   extra_height = 0;
1147   requisition->width = 0;
1148   requisition->height = 0;
1149
1150   gtk_widget_size_request (scrolled_window->hscrollbar,
1151                            &hscrollbar_requisition);
1152   gtk_widget_size_request (scrolled_window->vscrollbar,
1153                            &vscrollbar_requisition);
1154
1155   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1156     {
1157       gtk_widget_size_request (bin->child, &child_requisition);
1158
1159       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1160         requisition->width += child_requisition.width;
1161       else
1162         {
1163           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1164
1165           if (aux_info && aux_info->width > 0)
1166             {
1167               requisition->width += aux_info->width;
1168               extra_width = -1;
1169             }
1170           else
1171             requisition->width += vscrollbar_requisition.width;
1172         }
1173
1174       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1175         requisition->height += child_requisition.height;
1176       else
1177         {
1178           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
1179
1180           if (aux_info && aux_info->height > 0)
1181             {
1182               requisition->height += aux_info->height;
1183               extra_height = -1;
1184             }
1185           else
1186             requisition->height += hscrollbar_requisition.height;
1187         }
1188     }
1189
1190   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1191       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1192     {
1193       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
1194       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1195         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1196     }
1197
1198   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1199       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1200     {
1201       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
1202       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1203         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1204     }
1205
1206   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
1207   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
1208
1209   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1210     {
1211       requisition->width += 2 * widget->style->xthickness;
1212       requisition->height += 2 * widget->style->ythickness;
1213     }
1214 }
1215
1216 static void
1217 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1218                                          GtkAllocation *allocation)
1219 {
1220   GtkScrolledWindow *scrolled_window;
1221   GtkScrolledWindowPrivate *priv;
1222   gint scrollbar_spacing;
1223
1224   g_return_if_fail (widget != NULL);
1225   g_return_if_fail (allocation != NULL);
1226
1227   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1228   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1229
1230   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1231
1232   allocation->x = GTK_CONTAINER (widget)->border_width;
1233   allocation->y = GTK_CONTAINER (widget)->border_width;
1234
1235   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1236     {
1237       allocation->x += widget->style->xthickness;
1238       allocation->y += widget->style->ythickness;
1239     }
1240
1241   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1242   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1243
1244   if (scrolled_window->vscrollbar_visible)
1245     {
1246       GtkRequisition vscrollbar_requisition;
1247       gboolean is_rtl;
1248
1249       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1250                                         &vscrollbar_requisition);
1251       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1252
1253       if ((!is_rtl &&
1254            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1255             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1256           (is_rtl &&
1257            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1258             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1259         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1260
1261       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1262     }
1263   if (scrolled_window->hscrollbar_visible)
1264     {
1265       GtkRequisition hscrollbar_requisition;
1266       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1267                                         &hscrollbar_requisition);
1268
1269       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1270           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1271         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1272
1273       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1274     }
1275 }
1276
1277 static void
1278 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1279                                    GtkAllocation *allocation)
1280 {
1281   GtkScrolledWindow *scrolled_window;
1282   GtkScrolledWindowPrivate *priv;
1283   GtkBin *bin;
1284   GtkAllocation relative_allocation;
1285   GtkAllocation child_allocation;
1286   gint scrollbar_spacing;
1287
1288   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1289   g_return_if_fail (allocation != NULL);
1290
1291   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1292   bin = GTK_BIN (scrolled_window);
1293
1294   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1295
1296   priv = GTK_SCROLLED_WINDOW_GET_PRIVATE (scrolled_window);
1297
1298   widget->allocation = *allocation;
1299
1300   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1301     scrolled_window->hscrollbar_visible = TRUE;
1302   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1303     scrolled_window->hscrollbar_visible = FALSE;
1304   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1305     scrolled_window->vscrollbar_visible = TRUE;
1306   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1307     scrolled_window->vscrollbar_visible = FALSE;
1308
1309   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1310     {
1311       gboolean previous_hvis;
1312       gboolean previous_vvis;
1313       guint count = 0;
1314
1315       do
1316         {
1317           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1318
1319           child_allocation.x = relative_allocation.x + allocation->x;
1320           child_allocation.y = relative_allocation.y + allocation->y;
1321           child_allocation.width = relative_allocation.width;
1322           child_allocation.height = relative_allocation.height;
1323
1324           previous_hvis = scrolled_window->hscrollbar_visible;
1325           previous_vvis = scrolled_window->vscrollbar_visible;
1326
1327           gtk_widget_size_allocate (bin->child, &child_allocation);
1328
1329           /* If, after the first iteration, the hscrollbar and the
1330            * vscrollbar flip visiblity, then we need both.
1331            */
1332           if (count &&
1333               previous_hvis != scrolled_window->hscrollbar_visible &&
1334               previous_vvis != scrolled_window->vscrollbar_visible)
1335             {
1336               scrolled_window->hscrollbar_visible = TRUE;
1337               scrolled_window->vscrollbar_visible = TRUE;
1338
1339               /* a new resize is already queued at this point,
1340                * so we will immediatedly get reinvoked
1341                */
1342               return;
1343             }
1344
1345           count++;
1346         }
1347       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1348              previous_vvis != scrolled_window->vscrollbar_visible);
1349     }
1350   else
1351     {
1352       scrolled_window->hscrollbar_visible = scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS;
1353       scrolled_window->vscrollbar_visible = scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS;
1354       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1355     }
1356
1357   if (scrolled_window->hscrollbar_visible)
1358     {
1359       GtkRequisition hscrollbar_requisition;
1360       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1361                                         &hscrollbar_requisition);
1362
1363       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1364         gtk_widget_show (scrolled_window->hscrollbar);
1365
1366       child_allocation.x = relative_allocation.x;
1367       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1368           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1369         child_allocation.y = (relative_allocation.y +
1370                               relative_allocation.height +
1371                               scrollbar_spacing +
1372                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1373                                0 : widget->style->ythickness));
1374       else
1375         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1376
1377       child_allocation.width = relative_allocation.width;
1378       child_allocation.height = hscrollbar_requisition.height;
1379       child_allocation.x += allocation->x;
1380       child_allocation.y += allocation->y;
1381
1382       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1383         {
1384           child_allocation.x -= widget->style->xthickness;
1385           child_allocation.width += 2 * widget->style->xthickness;
1386         }
1387
1388       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1389     }
1390   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1391     gtk_widget_hide (scrolled_window->hscrollbar);
1392
1393   if (scrolled_window->vscrollbar_visible)
1394     {
1395       GtkRequisition vscrollbar_requisition;
1396       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1397         gtk_widget_show (scrolled_window->vscrollbar);
1398
1399       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1400                                         &vscrollbar_requisition);
1401
1402       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1403            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1404             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1405           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1406            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1407             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1408         child_allocation.x = (relative_allocation.x +
1409                               relative_allocation.width +
1410                               scrollbar_spacing +
1411                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1412                                0 : widget->style->xthickness));
1413       else
1414         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1415
1416       child_allocation.y = relative_allocation.y;
1417       child_allocation.width = vscrollbar_requisition.width;
1418       child_allocation.height = relative_allocation.height;
1419       child_allocation.x += allocation->x;
1420       child_allocation.y += allocation->y;
1421
1422       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1423         {
1424           child_allocation.y -= widget->style->ythickness;
1425           child_allocation.height += 2 * widget->style->ythickness;
1426         }
1427
1428       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1429     }
1430   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1431     gtk_widget_hide (scrolled_window->vscrollbar);
1432 }
1433
1434 static gint
1435 gtk_scrolled_window_scroll_event (GtkWidget *widget,
1436                                   GdkEventScroll *event)
1437 {
1438   GtkWidget *range;
1439
1440   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1441   g_return_val_if_fail (event != NULL, FALSE);
1442
1443   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1444     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1445   else
1446     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1447
1448   if (range && GTK_WIDGET_VISIBLE (range))
1449     {
1450       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1451       gdouble delta, new_value;
1452
1453       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1454
1455       new_value = CLAMP (adj->value + delta, adj->lower, adj->upper - adj->page_size);
1456
1457       gtk_adjustment_set_value (adj, new_value);
1458
1459       return TRUE;
1460     }
1461
1462   return FALSE;
1463 }
1464
1465 static gint
1466 gtk_scrolled_window_focus (GtkWidget        *widget,
1467                            GtkDirectionType  direction)
1468 {
1469   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1470   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1471
1472   if (scrolled_window->focus_out)
1473     {
1474       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1475       return FALSE;
1476     }
1477
1478   if (gtk_widget_is_focus (widget))
1479     return FALSE;
1480
1481   /* We only put the scrolled window itself in the focus chain if it
1482    * isn't possible to focus any children.
1483    */
1484   if (GTK_BIN (widget)->child)
1485     {
1486       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1487         return TRUE;
1488     }
1489
1490   if (!had_focus_child)
1491     {
1492       gtk_widget_grab_focus (widget);
1493       return TRUE;
1494     }
1495   else
1496     return FALSE;
1497 }
1498
1499 static void
1500 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1501                                         gpointer       data)
1502 {
1503   GtkScrolledWindow *scrolled_win;
1504
1505   g_return_if_fail (adjustment != NULL);
1506   g_return_if_fail (data != NULL);
1507
1508   scrolled_win = GTK_SCROLLED_WINDOW (data);
1509
1510   if (scrolled_win->hscrollbar &&
1511       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1512     {
1513       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1514         {
1515           gboolean visible;
1516
1517           visible = scrolled_win->hscrollbar_visible;
1518           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1519                                               adjustment->page_size);
1520           if (scrolled_win->hscrollbar_visible != visible)
1521             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1522         }
1523     }
1524   else if (scrolled_win->vscrollbar &&
1525            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1526     {
1527       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1528         {
1529           gboolean visible;
1530
1531           visible = scrolled_win->vscrollbar_visible;
1532           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1533                                               adjustment->page_size);
1534           if (scrolled_win->vscrollbar_visible != visible)
1535             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1536         }
1537     }
1538 }
1539
1540 static void
1541 gtk_scrolled_window_add (GtkContainer *container,
1542                          GtkWidget    *child)
1543 {
1544   GtkScrolledWindow *scrolled_window;
1545   GtkBin *bin;
1546
1547   bin = GTK_BIN (container);
1548   g_return_if_fail (bin->child == NULL);
1549
1550   scrolled_window = GTK_SCROLLED_WINDOW (container);
1551
1552   bin->child = child;
1553   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1554
1555   /* this is a temporary message */
1556   if (!gtk_widget_set_scroll_adjustments (child,
1557                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1558                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1559     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1560                "use gtk_scrolled_window_add_with_viewport() instead");
1561 }
1562
1563 static void
1564 gtk_scrolled_window_remove (GtkContainer *container,
1565                             GtkWidget    *child)
1566 {
1567   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1568   g_return_if_fail (child != NULL);
1569   g_return_if_fail (GTK_BIN (container)->child == child);
1570
1571   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1572
1573   /* chain parent class handler to remove child */
1574   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1575 }
1576
1577 void
1578 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1579                                        GtkWidget         *child)
1580 {
1581   GtkBin *bin;
1582   GtkWidget *viewport;
1583
1584   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1585   g_return_if_fail (GTK_IS_WIDGET (child));
1586   g_return_if_fail (child->parent == NULL);
1587
1588   bin = GTK_BIN (scrolled_window);
1589
1590   if (bin->child != NULL)
1591     {
1592       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1593       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1594
1595       viewport = bin->child;
1596     }
1597   else
1598     {
1599       viewport =
1600         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1601                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1602       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1603     }
1604
1605   gtk_widget_show (viewport);
1606   gtk_container_add (GTK_CONTAINER (viewport), child);
1607 }
1608
1609 /**
1610  * _gtk_scrolled_window_get_spacing:
1611  * @scrolled_window: a scrolled window
1612  *
1613  * Gets the spacing between the scrolled window's scrollbars and
1614  * the scrolled widget. Used by GtkCombo
1615  *
1616  * Return value: the spacing, in pixels.
1617  **/
1618 gint
1619 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1620 {
1621   GtkScrolledWindowClass *class;
1622
1623   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1624
1625   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1626
1627   if (class->scrollbar_spacing >= 0)
1628     return class->scrollbar_spacing;
1629   else
1630     {
1631       gint scrollbar_spacing;
1632
1633       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1634                             "scrollbar-spacing", &scrollbar_spacing,
1635                             NULL);
1636
1637       return scrollbar_spacing;
1638     }
1639 }
1640
1641 #define __GTK_SCROLLED_WINDOW_C__
1642 #include "gtkaliasdef.c"