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