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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include <gdk/gdkkeysyms.h>
  28 #include "gtkbindings.h"
  29 #include "gtkmarshalers.h"
  30 #include "gtkscrolledwindow.h"
  31 #include "gtksignal.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 SCROLLBAR_SPACING(w) (GTK_SCROLLED_WINDOW_GET_CLASS (w)->scrollbar_spacing)
  71
  72 #define DEFAULT_SCROLLBAR_SPACING  3
  73
  74 enum {
  75   PROP_0,
  76   PROP_HADJUSTMENT,
  77   PROP_VADJUSTMENT,
  78   PROP_HSCROLLBAR_POLICY,
  79   PROP_VSCROLLBAR_POLICY,
  80   PROP_WINDOW_PLACEMENT,
  81   PROP_SHADOW_TYPE,
  82   PROP_LAST
  83 };
  84
  85 /* Signals */
  86 enum
  87 {
  88   SCROLL_CHILD,
  89   MOVE_FOCUS_OUT,
  90   LAST_SIGNAL
  91 };
  92
  93 static void gtk_scrolled_window_class_init         (GtkScrolledWindowClass *klass);
  94 static void gtk_scrolled_window_init               (GtkScrolledWindow      *scrolled_window);
  95 static void gtk_scrolled_window_destroy            (GtkObject              *object);
  96 static void gtk_scrolled_window_finalize           (GObject                *object);
  97 static void gtk_scrolled_window_set_property       (GObject                *object,
  98                                                     guint                   prop_id,
  99                                                     const GValue           *value,
 100                                                     GParamSpec             *pspec);
 101 static void gtk_scrolled_window_get_property       (GObject                *object,
 102                                                     guint                   prop_id,
 103                                                     GValue                 *value,
 104                                                     GParamSpec             *pspec);
 105
 106 static gint gtk_scrolled_window_expose             (GtkWidget              *widget,
 107                                                     GdkEventExpose         *event);
 108 static void gtk_scrolled_window_size_request       (GtkWidget              *widget,
 109                                                     GtkRequisition         *requisition);
 110 static void gtk_scrolled_window_size_allocate      (GtkWidget              *widget,
 111                                                     GtkAllocation          *allocation);
 112 static gint gtk_scrolled_window_scroll_event       (GtkWidget              *widget,
 113                                                     GdkEventScroll         *event);
 114 static gint gtk_scrolled_window_focus              (GtkWidget              *widget,
 115                                                     GtkDirectionType        direction);
 116 static void gtk_scrolled_window_add                (GtkContainer           *container,
 117                                                     GtkWidget              *widget);
 118 static void gtk_scrolled_window_remove             (GtkContainer           *container,
 119                                                     GtkWidget              *widget);
 120 static void gtk_scrolled_window_forall             (GtkContainer           *container,
 121                                                     gboolean                include_internals,
 122                                                     GtkCallback             callback,
 123                                                     gpointer                callback_data);
 124 static void gtk_scrolled_window_scroll_child       (GtkScrolledWindow      *scrolled_window,
 125                                                     GtkScrollType           scroll,
 126                                                     gboolean                horizontal);
 127 static void gtk_scrolled_window_move_focus_out     (GtkScrolledWindow      *scrolled_window,
 128                                                     GtkDirectionType        direction_type);
 129
 130 static void gtk_scrolled_window_relative_allocation(GtkWidget              *widget,
 131                                                     GtkAllocation          *allocation);
 132 static void gtk_scrolled_window_adjustment_changed (GtkAdjustment          *adjustment,
 133                                                     gpointer                data);
 134
 135 static GtkContainerClass *parent_class = NULL;
 136
 137 static guint signals[LAST_SIGNAL] = {0};
 138
 139 GtkType
 140 gtk_scrolled_window_get_type (void)
 141 {
 142   static GtkType scrolled_window_type = 0;
 143
 144   if (!scrolled_window_type)
 145     {
 146       static const GtkTypeInfo scrolled_window_info =
 147       {
 148         "GtkScrolledWindow",
 149         sizeof (GtkScrolledWindow),
 150         sizeof (GtkScrolledWindowClass),
 151         (GtkClassInitFunc) gtk_scrolled_window_class_init,
 152         (GtkObjectInitFunc) gtk_scrolled_window_init,
 153         /* reserved_1 */ NULL,
 154         /* reserved_2 */ NULL,
 155         (GtkClassInitFunc) NULL,
 156       };
 157
 158       scrolled_window_type = gtk_type_unique (GTK_TYPE_BIN, &scrolled_window_info);
 159     }
 160
 161   return scrolled_window_type;
 162 }
 163
 164 static void
 165 add_scroll_binding (GtkBindingSet  *binding_set,
 166                     guint           keyval,
 167                     GdkModifierType mask,
 168                     GtkScrollType   scroll,
 169                     gboolean        horizontal)
 170 {
 171   guint keypad_keyval = keyval - GDK_Left + GDK_KP_Left;
 172
 173   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 174                                 "scroll_child", 2,
 175                                 GTK_TYPE_SCROLL_TYPE, scroll,
 176                                 G_TYPE_BOOLEAN, horizontal);
 177   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 178                                 "scroll_child", 2,
 179                                 GTK_TYPE_SCROLL_TYPE, scroll,
 180                                 G_TYPE_BOOLEAN, horizontal);
 181 }
 182
 183 static void
 184 add_tab_bindings (GtkBindingSet    *binding_set,
 185                   GdkModifierType   modifiers,
 186                   GtkDirectionType  direction)
 187 {
 188   gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
 189                                 "move_focus_out", 1,
 190                                 GTK_TYPE_DIRECTION_TYPE, direction);
 191   gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
 192                                 "move_focus_out", 1,
 193                                 GTK_TYPE_DIRECTION_TYPE, direction);
 194 }
 195
 196 static void
 197 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 198 {
 199   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 200   GtkObjectClass *object_class;
 201   GtkWidgetClass *widget_class;
 202   GtkContainerClass *container_class;
 203   GtkBindingSet *binding_set;
 204
 205   object_class = (GtkObjectClass*) class;
 206   widget_class = (GtkWidgetClass*) class;
 207   container_class = (GtkContainerClass*) class;
 208   parent_class = gtk_type_class (GTK_TYPE_BIN);
 209
 210   gobject_class->finalize = gtk_scrolled_window_finalize;
 211   gobject_class->set_property = gtk_scrolled_window_set_property;
 212   gobject_class->get_property = gtk_scrolled_window_get_property;
 213
 214   object_class->destroy = gtk_scrolled_window_destroy;
 215
 216   widget_class->expose_event = gtk_scrolled_window_expose;
 217   widget_class->size_request = gtk_scrolled_window_size_request;
 218   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 219   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 220   widget_class->focus = gtk_scrolled_window_focus;
 221
 222   container_class->add = gtk_scrolled_window_add;
 223   container_class->remove = gtk_scrolled_window_remove;
 224   container_class->forall = gtk_scrolled_window_forall;
 225
 226   class->scrollbar_spacing = DEFAULT_SCROLLBAR_SPACING;
 227
 228   class->scroll_child = gtk_scrolled_window_scroll_child;
 229   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 230
 231   g_object_class_install_property (gobject_class,
 232                                    PROP_HADJUSTMENT,
 233                                    g_param_spec_object ("hadjustment",
 234                                                         _("Horizontal Adjustment"),
 235                                                         _("The GtkAdjustment for the horizontal position."),
 236                                                         GTK_TYPE_ADJUSTMENT,
 237                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 238   g_object_class_install_property (gobject_class,
 239                                    PROP_VADJUSTMENT,
 240                                    g_param_spec_object ("vadjustment",
 241                                                         _("Vertical Adjustment"),
 242                                                         _("The GtkAdjustment for the vertical position."),
 243                                                         GTK_TYPE_ADJUSTMENT,
 244                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 245   g_object_class_install_property (gobject_class,
 246                                    PROP_HSCROLLBAR_POLICY,
 247                                    g_param_spec_enum ("hscrollbar_policy",
 248                                                       _("Horizontal Scrollbar Policy"),
 249                                                       _("When the horizontal scrollbar is displayed"),
 250                                                       GTK_TYPE_POLICY_TYPE,
 251                                                       GTK_POLICY_ALWAYS,
 252                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 253   g_object_class_install_property (gobject_class,
 254                                    PROP_VSCROLLBAR_POLICY,
 255                                    g_param_spec_enum ("vscrollbar_policy",
 256                                                       _("Vertical Scrollbar Policy"),
 257                                                       _("When the vertical scrollbar is displayed"),
 258                                                       GTK_TYPE_POLICY_TYPE,
 259                                                       GTK_POLICY_ALWAYS,
 260                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 261
 262   g_object_class_install_property (gobject_class,
 263                                    PROP_WINDOW_PLACEMENT,
 264                                    g_param_spec_enum ("window_placement",
 265                                                       _("Window Placement"),
 266                                                       _("Where the contents are located with respect to the scrollbars"),
 267                                                       GTK_TYPE_CORNER_TYPE,
 268                                                       GTK_CORNER_TOP_LEFT,
 269                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 270   g_object_class_install_property (gobject_class,
 271                                    PROP_SHADOW_TYPE,
 272                                    g_param_spec_enum ("shadow_type",
 273                                                       _("Shadow Type"),
 274                                                       _("Style of bevel around the contents"),
 275                                                       GTK_TYPE_SHADOW_TYPE,
 276                                                       GTK_SHADOW_NONE,
 277                                                       G_PARAM_READABLE | G_PARAM_WRITABLE));
 278
 279   signals[SCROLL_CHILD] =
 280     g_signal_new ("scroll_child",
 281                   G_TYPE_FROM_CLASS (object_class),
 282                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 283                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 284                   NULL, NULL,
 285                   _gtk_marshal_VOID__ENUM_BOOLEAN,
 286                   G_TYPE_NONE, 2,
 287                   GTK_TYPE_SCROLL_TYPE,
 288                   G_TYPE_BOOLEAN);
 289   signals[MOVE_FOCUS_OUT] =
 290     g_signal_new ("move_focus_out",
 291                   G_TYPE_FROM_CLASS (object_class),
 292                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 293                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 294                   NULL, NULL,
 295                   _gtk_marshal_VOID__ENUM,
 296                   G_TYPE_NONE, 1,
 297                   GTK_TYPE_DIRECTION_TYPE);
 298
 299   binding_set = gtk_binding_set_by_class (class);
 300
 301   add_scroll_binding (binding_set, GDK_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 302   add_scroll_binding (binding_set, GDK_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 303   add_scroll_binding (binding_set, GDK_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 304   add_scroll_binding (binding_set, GDK_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 305
 306   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 307   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 308   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 309   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 310
 311   add_scroll_binding (binding_set, GDK_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 312   add_scroll_binding (binding_set, GDK_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 313   add_scroll_binding (binding_set, GDK_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 314   add_scroll_binding (binding_set, GDK_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 315
 316   add_scroll_binding (binding_set, GDK_Home, 0,                GTK_SCROLL_START, TRUE);
 317   add_scroll_binding (binding_set, GDK_End,  0,                GTK_SCROLL_END,   TRUE);
 318   add_scroll_binding (binding_set, GDK_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, FALSE);
 319   add_scroll_binding (binding_set, GDK_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   FALSE);
 320
 321   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 322   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 323 }
 324
 325 static void
 326 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 327 {
 328   GTK_WIDGET_SET_FLAGS (scrolled_window, GTK_NO_WINDOW | GTK_CAN_FOCUS);
 329
 330   gtk_container_set_resize_mode (GTK_CONTAINER (scrolled_window), GTK_RESIZE_QUEUE);
 331
 332   scrolled_window->hscrollbar = NULL;
 333   scrolled_window->vscrollbar = NULL;
 334   scrolled_window->hscrollbar_policy = GTK_POLICY_ALWAYS;
 335   scrolled_window->vscrollbar_policy = GTK_POLICY_ALWAYS;
 336   scrolled_window->hscrollbar_visible = FALSE;
 337   scrolled_window->vscrollbar_visible = FALSE;
 338   scrolled_window->focus_out = FALSE;
 339   scrolled_window->window_placement = GTK_CORNER_TOP_LEFT;
 340
 341 }
 342
 343 GtkWidget*
 344 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 345                          GtkAdjustment *vadjustment)
 346 {
 347   GtkWidget *scrolled_window;
 348
 349   if (hadjustment)
 350     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 351
 352   if (vadjustment)
 353     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 354
 355   scrolled_window = gtk_widget_new (GTK_TYPE_SCROLLED_WINDOW,
 356                                     "hadjustment", hadjustment,
 357                                     "vadjustment", vadjustment,
 358                                     NULL);
 359
 360   return scrolled_window;
 361 }
 362
 363 void
 364 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 365                                      GtkAdjustment     *hadjustment)
 366 {
 367   GtkBin *bin;
 368
 369   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 370   if (hadjustment)
 371     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 372   else
 373     hadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 374
 375   bin = GTK_BIN (scrolled_window);
 376
 377   if (!scrolled_window->hscrollbar)
 378     {
 379       gtk_widget_push_composite_child ();
 380       scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
 381       gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
 382       gtk_widget_pop_composite_child ();
 383
 384       gtk_widget_set_parent (scrolled_window->hscrollbar, GTK_WIDGET (scrolled_window));
 385       gtk_widget_ref (scrolled_window->hscrollbar);
 386       gtk_widget_show (scrolled_window->hscrollbar);
 387     }
 388   else
 389     {
 390       GtkAdjustment *old_adjustment;
 391
 392       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 393       if (old_adjustment == hadjustment)
 394         return;
 395
 396       gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
 397                                      GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
 398                                      scrolled_window);
 399       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
 400                                 hadjustment);
 401     }
 402   hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 403   gtk_signal_connect (GTK_OBJECT (hadjustment),
 404                       "changed",
 405                       GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
 406                       scrolled_window);
 407   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 408
 409   if (bin->child)
 410     gtk_widget_set_scroll_adjustments (bin->child,
 411                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 412                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 413
 414   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 415 }
 416
 417 void
 418 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 419                                      GtkAdjustment     *vadjustment)
 420 {
 421   GtkBin *bin;
 422
 423   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 424   if (vadjustment)
 425     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 426   else
 427     vadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 428
 429   bin = GTK_BIN (scrolled_window);
 430
 431   if (!scrolled_window->vscrollbar)
 432     {
 433       gtk_widget_push_composite_child ();
 434       scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
 435       gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
 436       gtk_widget_pop_composite_child ();
 437
 438       gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
 439       gtk_widget_ref (scrolled_window->vscrollbar);
 440       gtk_widget_show (scrolled_window->vscrollbar);
 441     }
 442   else
 443     {
 444       GtkAdjustment *old_adjustment;
 445
 446       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 447       if (old_adjustment == vadjustment)
 448         return;
 449
 450       gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
 451                                      GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
 452                                      scrolled_window);
 453       gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
 454                                 vadjustment);
 455     }
 456   vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 457   gtk_signal_connect (GTK_OBJECT (vadjustment),
 458                       "changed",
 459                       GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
 460                       scrolled_window);
 461   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 462
 463   if (bin->child)
 464     gtk_widget_set_scroll_adjustments (bin->child,
 465                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
 466                                        gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
 467
 468   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 469 }
 470
 471 GtkAdjustment*
 472 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 473 {
 474   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 475
 476   return (scrolled_window->hscrollbar ?
 477           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
 478           NULL);
 479 }
 480
 481 GtkAdjustment*
 482 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 483 {
 484   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 485
 486   return (scrolled_window->vscrollbar ?
 487           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
 488           NULL);
 489 }
 490
 491 void
 492 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 493                                 GtkPolicyType      hscrollbar_policy,
 494                                 GtkPolicyType      vscrollbar_policy)
 495 {
 496   GObject *object = G_OBJECT (scrolled_window);
 497
 498   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 499
 500   if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
 501       (scrolled_window->vscrollbar_policy != vscrollbar_policy))
 502     {
 503       scrolled_window->hscrollbar_policy = hscrollbar_policy;
 504       scrolled_window->vscrollbar_policy = vscrollbar_policy;
 505
 506       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 507
 508       g_object_freeze_notify (object);
 509       g_object_notify (object, "hscrollbar_policy");
 510       g_object_notify (object, "vscrollbar_policy");
 511       g_object_thaw_notify (object);
 512     }
 513 }
 514
 515 /**
 516  * gtk_scrolled_window_get_policy:
 517  * @scrolled_window: a #GtkScrolledWindow
 518  * @hscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 519  * @vscrollbar_policy: location to store the policy for the horizontal scrollbar, or %NULL.
 520  *
 521  * Retrieves the current policy values for the horizontal and vertical
 522  * scrollbars. See gtk_scrolled_window_set_policy().
 523  **/
 524 void
 525 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 526                                 GtkPolicyType     *hscrollbar_policy,
 527                                 GtkPolicyType     *vscrollbar_policy)
 528 {
 529   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 530
 531   if (hscrollbar_policy)
 532     *hscrollbar_policy = scrolled_window->hscrollbar_policy;
 533   if (vscrollbar_policy)
 534     *vscrollbar_policy = scrolled_window->vscrollbar_policy;
 535 }
 536
 537 void
 538 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 539                                    GtkCornerType      window_placement)
 540 {
 541   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 542
 543   if (scrolled_window->window_placement != window_placement)
 544     {
 545       scrolled_window->window_placement = window_placement;
 546
 547       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 548
 549       g_object_notify (G_OBJECT (scrolled_window), "window_placement");
 550     }
 551 }
 552
 553 /**
 554  * gtk_scrolled_window_get_placement:
 555  * @scrolled_window: a #GtkScrolledWindow
 556  *
 557  * Gets the placement of the scrollbars for the scrolled window. See
 558  * gtk_scrolled_window_set_placement().
 559  *
 560  * Return value: the current placement value.
 561  **/
 562 GtkCornerType
 563 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 564 {
 565   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 566
 567   return scrolled_window->window_placement;
 568 }
 569
 570 /**
 571  * gtk_scrolled_window_set_shadow_type:
 572  * @scrolled_window: a #GtkScrolledWindow
 573  * @type: kind of shadow to draw around scrolled window contents
 574  *
 575  * Changes the type of shadow drawn around the contents of
 576  * @scrolled_window.
 577  *
 578  **/
 579 void
 580 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 581                                      GtkShadowType      type)
 582 {
 583   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 584   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 585
 586   if (scrolled_window->shadow_type != type)
 587     {
 588       scrolled_window->shadow_type = type;
 589
 590       if (GTK_WIDGET_DRAWABLE (scrolled_window))
 591         gtk_widget_queue_clear (GTK_WIDGET (scrolled_window));
 592
 593       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 594
 595       g_object_notify (G_OBJECT (scrolled_window), "shadow_type");
 596     }
 597 }
 598
 599 /**
 600  * gtk_scrolled_window_get_shadow_type:
 601  * @scrolled_window: a #GtkScrolledWindow
 602  *
 603  * Gets the shadow type of the scrolled window. See
 604  * gtk_scrolled_window_set_shadow_type().
 605  *
 606  * Return value: the current shadow type
 607  **/
 608 GtkShadowType
 609 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 610 {
 611   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 612
 613   return scrolled_window->shadow_type;
 614 }
 615
 616 static void
 617 gtk_scrolled_window_destroy (GtkObject *object)
 618 {
 619   GtkScrolledWindow *scrolled_window;
 620
 621   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));
 622
 623   scrolled_window = GTK_SCROLLED_WINDOW (object);
 624
 625   gtk_widget_unparent (scrolled_window->hscrollbar);
 626   gtk_widget_unparent (scrolled_window->vscrollbar);
 627   gtk_widget_destroy (scrolled_window->hscrollbar);
 628   gtk_widget_destroy (scrolled_window->vscrollbar);
 629
 630   GTK_OBJECT_CLASS (parent_class)->destroy (object);
 631 }
 632
 633 static void
 634 gtk_scrolled_window_finalize (GObject *object)
 635 {
 636   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 637
 638   gtk_widget_unref (scrolled_window->hscrollbar);
 639   gtk_widget_unref (scrolled_window->vscrollbar);
 640
 641   G_OBJECT_CLASS (parent_class)->finalize (object);
 642 }
 643
 644 static void
 645 gtk_scrolled_window_set_property (GObject      *object,
 646                                   guint         prop_id,
 647                                   const GValue *value,
 648                                   GParamSpec   *pspec)
 649 {
 650   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 651
 652   switch (prop_id)
 653     {
 654     case PROP_HADJUSTMENT:
 655       gtk_scrolled_window_set_hadjustment (scrolled_window,
 656                                            g_value_get_object (value));
 657       break;
 658     case PROP_VADJUSTMENT:
 659       gtk_scrolled_window_set_vadjustment (scrolled_window,
 660                                            g_value_get_object (value));
 661       break;
 662     case PROP_HSCROLLBAR_POLICY:
 663       gtk_scrolled_window_set_policy (scrolled_window,
 664                                       g_value_get_enum (value),
 665                                       scrolled_window->vscrollbar_policy);
 666       break;
 667     case PROP_VSCROLLBAR_POLICY:
 668       gtk_scrolled_window_set_policy (scrolled_window,
 669                                       scrolled_window->hscrollbar_policy,
 670                                       g_value_get_enum (value));
 671       break;
 672     case PROP_WINDOW_PLACEMENT:
 673       gtk_scrolled_window_set_placement (scrolled_window,
 674                                          g_value_get_enum (value));
 675       break;
 676     case PROP_SHADOW_TYPE:
 677       gtk_scrolled_window_set_shadow_type (scrolled_window,
 678                                            g_value_get_enum (value));
 679       break;
 680     default:
 681       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 682       break;
 683     }
 684 }
 685
 686 static void
 687 gtk_scrolled_window_get_property (GObject    *object,
 688                                   guint       prop_id,
 689                                   GValue     *value,
 690                                   GParamSpec *pspec)
 691 {
 692   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 693
 694   switch (prop_id)
 695     {
 696     case PROP_HADJUSTMENT:
 697       g_value_set_object (value,
 698                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
 699       break;
 700     case PROP_VADJUSTMENT:
 701       g_value_set_object (value,
 702                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
 703       break;
 704     case PROP_HSCROLLBAR_POLICY:
 705       g_value_set_enum (value, scrolled_window->hscrollbar_policy);
 706       break;
 707     case PROP_VSCROLLBAR_POLICY:
 708       g_value_set_enum (value, scrolled_window->vscrollbar_policy);
 709       break;
 710     case PROP_WINDOW_PLACEMENT:
 711       g_value_set_enum (value, scrolled_window->window_placement);
 712       break;
 713     case PROP_SHADOW_TYPE:
 714       g_value_set_enum (value, scrolled_window->shadow_type);
 715       break;
 716     default:
 717       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 718       break;
 719     }
 720 }
 721
 722 static void
 723 gtk_scrolled_window_paint (GtkWidget    *widget,
 724                            GdkRectangle *area)
 725 {
 726   GtkAllocation relative_allocation;
 727   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 728
 729   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 730     {
 731       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
 732
 733       relative_allocation.x -= widget->style->xthickness;
 734       relative_allocation.y -= widget->style->ythickness;
 735       relative_allocation.width += 2 * widget->style->xthickness;
 736       relative_allocation.height += 2 * widget->style->ythickness;
 737
 738       gtk_paint_shadow (widget->style, widget->window,
 739                         GTK_STATE_NORMAL, scrolled_window->shadow_type,
 740                         area, widget, "scrolled_window",
 741                         widget->allocation.x + relative_allocation.x,
 742                         widget->allocation.y + relative_allocation.y,
 743                         relative_allocation.width,
 744                         relative_allocation.height);
 745     }
 746 }
 747
 748 static gint
 749 gtk_scrolled_window_expose (GtkWidget      *widget,
 750                             GdkEventExpose *event)
 751 {
 752   if (GTK_WIDGET_DRAWABLE (widget))
 753     {
 754       gtk_scrolled_window_paint (widget, &event->area);
 755
 756       (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
 757     }
 758
 759   return FALSE;
 760 }
 761
 762 static void
 763 gtk_scrolled_window_forall (GtkContainer *container,
 764                             gboolean      include_internals,
 765                             GtkCallback   callback,
 766                             gpointer      callback_data)
 767 {
 768   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
 769   g_return_if_fail (callback != NULL);
 770
 771   GTK_CONTAINER_CLASS (parent_class)->forall (container,
 772                                               include_internals,
 773                                               callback,
 774                                               callback_data);
 775   if (include_internals)
 776     {
 777       GtkScrolledWindow *scrolled_window;
 778
 779       scrolled_window = GTK_SCROLLED_WINDOW (container);
 780
 781       if (scrolled_window->vscrollbar)
 782         callback (scrolled_window->vscrollbar, callback_data);
 783       if (scrolled_window->hscrollbar)
 784         callback (scrolled_window->hscrollbar, callback_data);
 785     }
 786 }
 787
 788 static void
 789 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
 790                                   GtkScrollType      scroll,
 791                                   gboolean           horizontal)
 792 {
 793   GtkAdjustment *adjustment = NULL;
 794
 795   switch (scroll)
 796     {
 797     case GTK_SCROLL_STEP_UP:
 798       scroll = GTK_SCROLL_STEP_BACKWARD;
 799       horizontal = FALSE;
 800       break;
 801     case GTK_SCROLL_STEP_DOWN:
 802       scroll = GTK_SCROLL_STEP_FORWARD;
 803       horizontal = FALSE;
 804       break;
 805     case GTK_SCROLL_STEP_LEFT:
 806       scroll = GTK_SCROLL_STEP_BACKWARD;
 807       horizontal = TRUE;
 808       break;
 809     case GTK_SCROLL_STEP_RIGHT:
 810       scroll = GTK_SCROLL_STEP_FORWARD;
 811       horizontal = TRUE;
 812       break;
 813     case GTK_SCROLL_PAGE_UP:
 814       scroll = GTK_SCROLL_PAGE_BACKWARD;
 815       horizontal = FALSE;
 816       break;
 817     case GTK_SCROLL_PAGE_DOWN:
 818       scroll = GTK_SCROLL_PAGE_FORWARD;
 819       horizontal = FALSE;
 820       break;
 821     case GTK_SCROLL_PAGE_LEFT:
 822       scroll = GTK_SCROLL_STEP_BACKWARD;
 823       horizontal = TRUE;
 824       break;
 825     case GTK_SCROLL_PAGE_RIGHT:
 826       scroll = GTK_SCROLL_STEP_FORWARD;
 827       horizontal = TRUE;
 828       break;
 829     case GTK_SCROLL_STEP_BACKWARD:
 830     case GTK_SCROLL_STEP_FORWARD:
 831     case GTK_SCROLL_PAGE_BACKWARD:
 832     case GTK_SCROLL_PAGE_FORWARD:
 833     case GTK_SCROLL_START:
 834     case GTK_SCROLL_END:
 835       break;
 836     default:
 837       g_warning ("Invalid scroll type %d for GtkSpinButton::change-value", scroll);
 838       return;
 839     }
 840
 841   if (horizontal)
 842     {
 843       if (scrolled_window->hscrollbar)
 844         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
 845     }
 846   else
 847     {
 848       if (scrolled_window->vscrollbar)
 849         adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
 850     }
 851
 852   if (adjustment)
 853     {
 854       gdouble value = adjustment->value;
 855
 856       switch (scroll)
 857         {
 858         case GTK_SCROLL_STEP_FORWARD:
 859           value += adjustment->step_increment;
 860           break;
 861         case GTK_SCROLL_STEP_BACKWARD:
 862           value -= adjustment->step_increment;
 863           break;
 864         case GTK_SCROLL_PAGE_FORWARD:
 865           value += adjustment->page_increment;
 866           break;
 867         case GTK_SCROLL_PAGE_BACKWARD:
 868           value -= adjustment->page_increment;
 869           break;
 870         case GTK_SCROLL_START:
 871           value = adjustment->lower;
 872           break;
 873         case GTK_SCROLL_END:
 874           value = adjustment->upper;
 875           break;
 876         default:
 877           g_assert_not_reached ();
 878           break;
 879         }
 880
 881       value = CLAMP (value, adjustment->lower, adjustment->upper - adjustment->page_size);
 882
 883       gtk_adjustment_set_value (adjustment, value);
 884     }
 885 }
 886
 887 static void
 888 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
 889                                     GtkDirectionType   direction_type)
 890 {
 891   GtkWidget *toplevel;
 892
 893   /* Focus out of the scrolled window entirely. We do this by setting
 894    * a flag, then propagating the focus motion to the notebook.
 895    */
 896   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
 897   if (!GTK_WIDGET_TOPLEVEL (toplevel))
 898     return;
 899
 900   g_object_ref (scrolled_window);
 901
 902   scrolled_window->focus_out = TRUE;
 903   g_signal_emit_by_name (G_OBJECT (toplevel), "move_focus", direction_type);
 904   scrolled_window->focus_out = FALSE;
 905
 906   g_object_unref (scrolled_window);
 907 }
 908
 909 static void
 910 gtk_scrolled_window_size_request (GtkWidget      *widget,
 911                                   GtkRequisition *requisition)
 912 {
 913   GtkScrolledWindow *scrolled_window;
 914   GtkBin *bin;
 915   gint extra_width;
 916   gint extra_height;
 917   GtkRequisition hscrollbar_requisition;
 918   GtkRequisition vscrollbar_requisition;
 919   GtkRequisition child_requisition;
 920
 921   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
 922   g_return_if_fail (requisition != NULL);
 923
 924   scrolled_window = GTK_SCROLLED_WINDOW (widget);
 925   bin = GTK_BIN (scrolled_window);
 926
 927   extra_width = 0;
 928   extra_height = 0;
 929   requisition->width = 0;
 930   requisition->height = 0;
 931
 932   gtk_widget_size_request (scrolled_window->hscrollbar,
 933                            &hscrollbar_requisition);
 934   gtk_widget_size_request (scrolled_window->vscrollbar,
 935                            &vscrollbar_requisition);
 936
 937   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
 938     {
 939       gtk_widget_size_request (bin->child, &child_requisition);
 940
 941       if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
 942         requisition->width += child_requisition.width;
 943       else
 944         {
 945           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 946
 947           if (aux_info && aux_info->width > 0)
 948             {
 949               requisition->width += aux_info->width;
 950               extra_width = -1;
 951             }
 952           else
 953             requisition->width += vscrollbar_requisition.width;
 954         }
 955
 956       if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
 957         requisition->height += child_requisition.height;
 958       else
 959         {
 960           GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (bin->child, FALSE);
 961
 962           if (aux_info && aux_info->height > 0)
 963             {
 964               requisition->height += aux_info->height;
 965               extra_height = -1;
 966             }
 967           else
 968             requisition->height += hscrollbar_requisition.height;
 969         }
 970     }
 971
 972   if (scrolled_window->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
 973       scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 974     {
 975       requisition->width = MAX (requisition->width, hscrollbar_requisition.width);
 976       if (!extra_height || scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
 977         extra_height = SCROLLBAR_SPACING (scrolled_window) + hscrollbar_requisition.height;
 978     }
 979
 980   if (scrolled_window->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
 981       scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 982     {
 983       requisition->height = MAX (requisition->height, vscrollbar_requisition.height);
 984       if (!extra_height || scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
 985         extra_width = SCROLLBAR_SPACING (scrolled_window) + vscrollbar_requisition.width;
 986     }
 987
 988   requisition->width += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_width);
 989   requisition->height += GTK_CONTAINER (widget)->border_width * 2 + MAX (0, extra_height);
 990
 991   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
 992     {
 993       requisition->width += 2 * widget->style->xthickness;
 994       requisition->height += 2 * widget->style->ythickness;
 995     }
 996 }
 997
 998 static void
 999 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1000                                          GtkAllocation *allocation)
1001 {
1002   GtkScrolledWindow *scrolled_window;
1003
1004   g_return_if_fail (widget != NULL);
1005   g_return_if_fail (allocation != NULL);
1006
1007   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1008
1009   allocation->x = GTK_CONTAINER (widget)->border_width;
1010   allocation->y = GTK_CONTAINER (widget)->border_width;
1011
1012   if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1013     {
1014       allocation->x += widget->style->xthickness;
1015       allocation->y += widget->style->ythickness;
1016     }
1017
1018   allocation->width = MAX (1, (gint)widget->allocation.width - allocation->x * 2);
1019   allocation->height = MAX (1, (gint)widget->allocation.height - allocation->y * 2);
1020
1021   if (scrolled_window->vscrollbar_visible)
1022     {
1023       GtkRequisition vscrollbar_requisition;
1024       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1025                                         &vscrollbar_requisition);
1026
1027       if (scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT ||
1028           scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
1029         allocation->x += (vscrollbar_requisition.width +
1030                           SCROLLBAR_SPACING (scrolled_window));
1031
1032       allocation->width = MAX (1, (gint)allocation->width -
1033                                ((gint)vscrollbar_requisition.width +
1034                                 (gint)SCROLLBAR_SPACING (scrolled_window)));
1035     }
1036   if (scrolled_window->hscrollbar_visible)
1037     {
1038       GtkRequisition hscrollbar_requisition;
1039       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1040                                         &hscrollbar_requisition);
1041
1042       if (scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT ||
1043           scrolled_window->window_placement == GTK_CORNER_BOTTOM_RIGHT)
1044         allocation->y += (hscrollbar_requisition.height +
1045                           SCROLLBAR_SPACING (scrolled_window));
1046
1047       allocation->height = MAX (1, (gint)allocation->height -
1048                                 ((gint)hscrollbar_requisition.height +
1049                                  (gint)SCROLLBAR_SPACING (scrolled_window)));
1050     }
1051 }
1052
1053 static void
1054 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1055                                    GtkAllocation *allocation)
1056 {
1057   GtkScrolledWindow *scrolled_window;
1058   GtkBin *bin;
1059   GtkAllocation relative_allocation;
1060   GtkAllocation child_allocation;
1061
1062   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1063   g_return_if_fail (allocation != NULL);
1064
1065   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1066   bin = GTK_BIN (scrolled_window);
1067
1068   widget->allocation = *allocation;
1069
1070   if (scrolled_window->hscrollbar_policy == GTK_POLICY_ALWAYS)
1071     scrolled_window->hscrollbar_visible = TRUE;
1072   else if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
1073     scrolled_window->hscrollbar_visible = FALSE;
1074   if (scrolled_window->vscrollbar_policy == GTK_POLICY_ALWAYS)
1075     scrolled_window->vscrollbar_visible = TRUE;
1076   else if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
1077     scrolled_window->vscrollbar_visible = FALSE;
1078
1079   if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
1080     {
1081       gboolean previous_hvis;
1082       gboolean previous_vvis;
1083       guint count = 0;
1084
1085       do
1086         {
1087           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1088
1089           child_allocation.x = relative_allocation.x + allocation->x;
1090           child_allocation.y = relative_allocation.y + allocation->y;
1091           child_allocation.width = relative_allocation.width;
1092           child_allocation.height = relative_allocation.height;
1093
1094           previous_hvis = scrolled_window->hscrollbar_visible;
1095           previous_vvis = scrolled_window->vscrollbar_visible;
1096
1097           gtk_widget_size_allocate (bin->child, &child_allocation);
1098
1099           /* If, after the first iteration, the hscrollbar and the
1100            * vscrollbar flip visiblity, then we need both.
1101            */
1102           if (count &&
1103               previous_hvis != scrolled_window->hscrollbar_visible &&
1104               previous_vvis != scrolled_window->vscrollbar_visible)
1105             {
1106               scrolled_window->hscrollbar_visible = TRUE;
1107               scrolled_window->vscrollbar_visible = TRUE;
1108
1109               /* a new resize is already queued at this point,
1110                * so we will immediatedly get reinvoked
1111                */
1112               return;
1113             }
1114
1115           count++;
1116         }
1117       while (previous_hvis != scrolled_window->hscrollbar_visible ||
1118              previous_vvis != scrolled_window->vscrollbar_visible);
1119     }
1120   else
1121     gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1122
1123   if (scrolled_window->hscrollbar_visible)
1124     {
1125       GtkRequisition hscrollbar_requisition;
1126       gtk_widget_get_child_requisition (scrolled_window->hscrollbar,
1127                                         &hscrollbar_requisition);
1128
1129       if (!GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1130         gtk_widget_show (scrolled_window->hscrollbar);
1131
1132       child_allocation.x = relative_allocation.x;
1133       if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1134           scrolled_window->window_placement == GTK_CORNER_TOP_RIGHT)
1135         child_allocation.y = (relative_allocation.y +
1136                               relative_allocation.height +
1137                               SCROLLBAR_SPACING (scrolled_window) +
1138                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1139                                0 : widget->style->ythickness));
1140       else
1141         child_allocation.y = GTK_CONTAINER (scrolled_window)->border_width;
1142
1143       child_allocation.width = relative_allocation.width;
1144       child_allocation.height = hscrollbar_requisition.height;
1145       child_allocation.x += allocation->x;
1146       child_allocation.y += allocation->y;
1147
1148       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1149         {
1150           child_allocation.x -= widget->style->xthickness;
1151           child_allocation.width += 2 * widget->style->xthickness;
1152         }
1153
1154       gtk_widget_size_allocate (scrolled_window->hscrollbar, &child_allocation);
1155     }
1156   else if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar))
1157     gtk_widget_hide (scrolled_window->hscrollbar);
1158
1159   if (scrolled_window->vscrollbar_visible)
1160     {
1161       GtkRequisition vscrollbar_requisition;
1162       if (!GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1163         gtk_widget_show (scrolled_window->vscrollbar);
1164
1165       gtk_widget_get_child_requisition (scrolled_window->vscrollbar,
1166                                         &vscrollbar_requisition);
1167
1168       if (scrolled_window->window_placement == GTK_CORNER_TOP_LEFT ||
1169           scrolled_window->window_placement == GTK_CORNER_BOTTOM_LEFT)
1170         child_allocation.x = (relative_allocation.x +
1171                               relative_allocation.width +
1172                               SCROLLBAR_SPACING (scrolled_window) +
1173                               (scrolled_window->shadow_type == GTK_SHADOW_NONE ?
1174                                0 : widget->style->xthickness));
1175       else
1176         child_allocation.x = GTK_CONTAINER (scrolled_window)->border_width;
1177
1178       child_allocation.y = relative_allocation.y;
1179       child_allocation.width = vscrollbar_requisition.width;
1180       child_allocation.height = relative_allocation.height;
1181       child_allocation.x += allocation->x;
1182       child_allocation.y += allocation->y;
1183
1184       if (scrolled_window->shadow_type != GTK_SHADOW_NONE)
1185         {
1186           child_allocation.y -= widget->style->ythickness;
1187           child_allocation.height += 2 * widget->style->ythickness;
1188         }
1189
1190       gtk_widget_size_allocate (scrolled_window->vscrollbar, &child_allocation);
1191     }
1192   else if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar))
1193     gtk_widget_hide (scrolled_window->vscrollbar);
1194 }
1195
1196 static gint
1197 gtk_scrolled_window_scroll_event (GtkWidget *widget,
1198                                   GdkEventScroll *event)
1199 {
1200   GtkWidget *range;
1201
1202   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1203   g_return_val_if_fail (event != NULL, FALSE);
1204
1205   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1206     range = GTK_SCROLLED_WINDOW (widget)->vscrollbar;
1207   else
1208     range = GTK_SCROLLED_WINDOW (widget)->hscrollbar;
1209
1210   if (range && GTK_WIDGET_VISIBLE (range))
1211     {
1212       GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
1213       gdouble new_value;
1214
1215       if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_LEFT)
1216         new_value = adj->value - adj->page_increment / 2;
1217       else
1218         new_value = adj->value + adj->page_increment / 2;
1219
1220       new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
1221       gtk_adjustment_set_value (adj, new_value);
1222
1223       return TRUE;
1224     }
1225
1226   return FALSE;
1227 }
1228
1229 static gint
1230 gtk_scrolled_window_focus (GtkWidget        *widget,
1231                            GtkDirectionType  direction)
1232 {
1233   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1234   gboolean had_focus_child = GTK_CONTAINER (widget)->focus_child != NULL;
1235
1236   if (scrolled_window->focus_out)
1237     {
1238       scrolled_window->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1239       return FALSE;
1240     }
1241
1242   if (gtk_widget_is_focus (widget))
1243     return FALSE;
1244
1245   /* We only put the scrolled window itself in the focus chain if it
1246    * isn't possible to focus any children.
1247    */
1248   if (GTK_BIN (widget)->child)
1249     {
1250       if (gtk_widget_child_focus (GTK_BIN (widget)->child, direction))
1251         return TRUE;
1252     }
1253
1254   if (!had_focus_child)
1255     {
1256       gtk_widget_grab_focus (widget);
1257       return TRUE;
1258     }
1259   else
1260     return FALSE;
1261 }
1262
1263 static void
1264 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1265                                         gpointer       data)
1266 {
1267   GtkScrolledWindow *scrolled_win;
1268
1269   g_return_if_fail (adjustment != NULL);
1270   g_return_if_fail (data != NULL);
1271
1272   scrolled_win = GTK_SCROLLED_WINDOW (data);
1273
1274   if (scrolled_win->hscrollbar &&
1275       adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->hscrollbar)))
1276     {
1277       if (scrolled_win->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1278         {
1279           gboolean visible;
1280
1281           visible = scrolled_win->hscrollbar_visible;
1282           scrolled_win->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1283                                               adjustment->page_size);
1284           if (scrolled_win->hscrollbar_visible != visible)
1285             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1286         }
1287     }
1288   else if (scrolled_win->vscrollbar &&
1289            adjustment == gtk_range_get_adjustment (GTK_RANGE (scrolled_win->vscrollbar)))
1290     {
1291       if (scrolled_win->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1292         {
1293           gboolean visible;
1294
1295           visible = scrolled_win->vscrollbar_visible;
1296           scrolled_win->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1297                                               adjustment->page_size);
1298           if (scrolled_win->vscrollbar_visible != visible)
1299             gtk_widget_queue_resize (GTK_WIDGET (scrolled_win));
1300         }
1301     }
1302 }
1303
1304 static void
1305 gtk_scrolled_window_add (GtkContainer *container,
1306                          GtkWidget    *child)
1307 {
1308   GtkScrolledWindow *scrolled_window;
1309   GtkBin *bin;
1310
1311   bin = GTK_BIN (container);
1312   g_return_if_fail (bin->child == NULL);
1313
1314   scrolled_window = GTK_SCROLLED_WINDOW (container);
1315
1316   bin->child = child;
1317   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1318
1319   /* this is a temporary message */
1320   if (!gtk_widget_set_scroll_adjustments (child,
1321                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
1322                                           gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar))))
1323     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1324                "use gtk_scrolled_window_add_with_viewport() instead");
1325 }
1326
1327 static void
1328 gtk_scrolled_window_remove (GtkContainer *container,
1329                             GtkWidget    *child)
1330 {
1331   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1332   g_return_if_fail (child != NULL);
1333   g_return_if_fail (GTK_BIN (container)->child == child);
1334
1335   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1336
1337   /* chain parent class handler to remove child */
1338   GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
1339 }
1340
1341 void
1342 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1343                                        GtkWidget         *child)
1344 {
1345   GtkBin *bin;
1346   GtkWidget *viewport;
1347
1348   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1349   g_return_if_fail (GTK_IS_WIDGET (child));
1350   g_return_if_fail (child->parent == NULL);
1351
1352   bin = GTK_BIN (scrolled_window);
1353
1354   if (bin->child != NULL)
1355     {
1356       g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
1357       g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
1358
1359       viewport = bin->child;
1360     }
1361   else
1362     {
1363       viewport =
1364         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1365                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1366       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1367     }
1368
1369   gtk_widget_show (viewport);
1370   gtk_container_add (GTK_CONTAINER (viewport), child);
1371 }