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 "gtksizerequest.h"
  32 #include "gtkmarshalers.h"
  33 #include "gtkscrolledwindow.h"
  34 #include "gtkwindow.h"
  35 #include "gtkprivate.h"
  36 #include "gtkintl.h"
  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_size_request().
  46  *
  47  * a scrolled window needs (for implementing 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 struct _GtkScrolledWindowPrivate
  76 {
  77   GtkCornerType  real_window_placement;
  78   GtkWidget     *hscrollbar;
  79   GtkWidget     *vscrollbar;
  80
  81   gboolean window_placement_set;
  82
  83   guint16  shadow_type;
  84
  85   guint    hscrollbar_policy      : 2;
  86   guint    vscrollbar_policy      : 2;
  87   guint    hscrollbar_visible     : 1;
  88   guint    vscrollbar_visible     : 1;
  89   guint    window_placement       : 2;
  90   guint    focus_out              : 1;   /* Flag used by ::move-focus-out implementation */
  91 };
  92
  93
  94 enum {
  95   PROP_0,
  96   PROP_HADJUSTMENT,
  97   PROP_VADJUSTMENT,
  98   PROP_HSCROLLBAR_POLICY,
  99   PROP_VSCROLLBAR_POLICY,
 100   PROP_WINDOW_PLACEMENT,
 101   PROP_WINDOW_PLACEMENT_SET,
 102   PROP_SHADOW_TYPE
 103 };
 104
 105 /* Signals */
 106 enum
 107 {
 108   SCROLL_CHILD,
 109   MOVE_FOCUS_OUT,
 110   LAST_SIGNAL
 111 };
 112
 113 static void     gtk_scrolled_window_destroy            (GtkObject         *object);
 114 static void     gtk_scrolled_window_set_property       (GObject           *object,
 115                                                         guint              prop_id,
 116                                                         const GValue      *value,
 117                                                         GParamSpec        *pspec);
 118 static void     gtk_scrolled_window_get_property       (GObject           *object,
 119                                                         guint              prop_id,
 120                                                         GValue            *value,
 121                                                         GParamSpec        *pspec);
 122
 123 static void     gtk_scrolled_window_screen_changed     (GtkWidget         *widget,
 124                                                         GdkScreen         *previous_screen);
 125 static gboolean gtk_scrolled_window_expose             (GtkWidget         *widget,
 126                                                         GdkEventExpose    *event);
 127 static void     gtk_scrolled_window_size_allocate      (GtkWidget         *widget,
 128                                                         GtkAllocation     *allocation);
 129 static gboolean gtk_scrolled_window_scroll_event       (GtkWidget         *widget,
 130                                                         GdkEventScroll    *event);
 131 static gboolean gtk_scrolled_window_focus              (GtkWidget         *widget,
 132                                                         GtkDirectionType   direction);
 133 static void     gtk_scrolled_window_add                (GtkContainer      *container,
 134                                                         GtkWidget         *widget);
 135 static void     gtk_scrolled_window_remove             (GtkContainer      *container,
 136                                                         GtkWidget         *widget);
 137 static void     gtk_scrolled_window_forall             (GtkContainer      *container,
 138                                                         gboolean           include_internals,
 139                                                         GtkCallback        callback,
 140                                                         gpointer           callback_data);
 141 static gboolean gtk_scrolled_window_scroll_child       (GtkScrolledWindow *scrolled_window,
 142                                                         GtkScrollType      scroll,
 143                                                         gboolean           horizontal);
 144 static void     gtk_scrolled_window_move_focus_out     (GtkScrolledWindow *scrolled_window,
 145                                                         GtkDirectionType   direction_type);
 146
 147 static void     gtk_scrolled_window_relative_allocation(GtkWidget         *widget,
 148                                                         GtkAllocation     *allocation);
 149 static void     gtk_scrolled_window_adjustment_changed (GtkAdjustment     *adjustment,
 150                                                         gpointer           data);
 151
 152 static void  gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window);
 153
 154 static void  gtk_scrolled_window_size_request_init     (GtkSizeRequestIface *iface);
 155 static void  gtk_scrolled_window_get_width             (GtkSizeRequest      *widget,
 156                                                         gint                *minimum_size,
 157                                                         gint                *natural_size);
 158 static void  gtk_scrolled_window_get_height            (GtkSizeRequest      *widget,
 159                                                         gint                *minimum_size,
 160                                                         gint                *natural_size);
 161 static void  gtk_scrolled_window_get_height_for_width  (GtkSizeRequest      *layout,
 162                                                         gint                 width,
 163                                                         gint                *minimum_height,
 164                                                         gint                *natural_height);
 165 static void  gtk_scrolled_window_get_width_for_height  (GtkSizeRequest      *layout,
 166                                                         gint                 width,
 167                                                         gint                *minimum_height,
 168                                                         gint                *natural_height);
 169
 170 static guint signals[LAST_SIGNAL] = {0};
 171
 172 G_DEFINE_TYPE_WITH_CODE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN,
 173                          G_IMPLEMENT_INTERFACE (GTK_TYPE_SIZE_REQUEST,
 174                                                 gtk_scrolled_window_size_request_init))
 175
 176
 177 static void
 178 add_scroll_binding (GtkBindingSet  *binding_set,
 179                     guint           keyval,
 180                     GdkModifierType mask,
 181                     GtkScrollType   scroll,
 182                     gboolean        horizontal)
 183 {
 184   guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left;
 185
 186   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 187                                 "scroll-child", 2,
 188                                 GTK_TYPE_SCROLL_TYPE, scroll,
 189                                 G_TYPE_BOOLEAN, horizontal);
 190   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 191                                 "scroll-child", 2,
 192                                 GTK_TYPE_SCROLL_TYPE, scroll,
 193                                 G_TYPE_BOOLEAN, horizontal);
 194 }
 195
 196 static void
 197 add_tab_bindings (GtkBindingSet    *binding_set,
 198                   GdkModifierType   modifiers,
 199                   GtkDirectionType  direction)
 200 {
 201   gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers,
 202                                 "move-focus-out", 1,
 203                                 GTK_TYPE_DIRECTION_TYPE, direction);
 204   gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers,
 205                                 "move-focus-out", 1,
 206                                 GTK_TYPE_DIRECTION_TYPE, direction);
 207 }
 208
 209 static void
 210 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 211 {
 212   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 213   GtkObjectClass *object_class;
 214   GtkWidgetClass *widget_class;
 215   GtkContainerClass *container_class;
 216   GtkBindingSet *binding_set;
 217
 218   object_class = (GtkObjectClass*) class;
 219   widget_class = (GtkWidgetClass*) class;
 220   container_class = (GtkContainerClass*) class;
 221
 222   gobject_class->set_property = gtk_scrolled_window_set_property;
 223   gobject_class->get_property = gtk_scrolled_window_get_property;
 224
 225   object_class->destroy = gtk_scrolled_window_destroy;
 226
 227   widget_class->screen_changed = gtk_scrolled_window_screen_changed;
 228   widget_class->expose_event = gtk_scrolled_window_expose;
 229   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 230   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 231   widget_class->focus = gtk_scrolled_window_focus;
 232
 233   container_class->add = gtk_scrolled_window_add;
 234   container_class->remove = gtk_scrolled_window_remove;
 235   container_class->forall = gtk_scrolled_window_forall;
 236
 237   class->scrollbar_spacing = -1;
 238
 239   class->scroll_child = gtk_scrolled_window_scroll_child;
 240   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 241
 242   g_object_class_install_property (gobject_class,
 243                                    PROP_HADJUSTMENT,
 244                                    g_param_spec_object ("hadjustment",
 245                                                         P_("Horizontal Adjustment"),
 246                                                         P_("The GtkAdjustment for the horizontal position"),
 247                                                         GTK_TYPE_ADJUSTMENT,
 248                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 249   g_object_class_install_property (gobject_class,
 250                                    PROP_VADJUSTMENT,
 251                                    g_param_spec_object ("vadjustment",
 252                                                         P_("Vertical Adjustment"),
 253                                                         P_("The GtkAdjustment for the vertical position"),
 254                                                         GTK_TYPE_ADJUSTMENT,
 255                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 256   g_object_class_install_property (gobject_class,
 257                                    PROP_HSCROLLBAR_POLICY,
 258                                    g_param_spec_enum ("hscrollbar-policy",
 259                                                       P_("Horizontal Scrollbar Policy"),
 260                                                       P_("When the horizontal scrollbar is displayed"),
 261                                                       GTK_TYPE_POLICY_TYPE,
 262                                                       GTK_POLICY_AUTOMATIC,
 263                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 264   g_object_class_install_property (gobject_class,
 265                                    PROP_VSCROLLBAR_POLICY,
 266                                    g_param_spec_enum ("vscrollbar-policy",
 267                                                       P_("Vertical Scrollbar Policy"),
 268                                                       P_("When the vertical scrollbar is displayed"),
 269                                                       GTK_TYPE_POLICY_TYPE,
 270                                                       GTK_POLICY_AUTOMATIC,
 271                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 272
 273   g_object_class_install_property (gobject_class,
 274                                    PROP_WINDOW_PLACEMENT,
 275                                    g_param_spec_enum ("window-placement",
 276                                                       P_("Window Placement"),
 277                                                       P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
 278                                                       GTK_TYPE_CORNER_TYPE,
 279                                                       GTK_CORNER_TOP_LEFT,
 280                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 281
 282   /**
 283    * GtkScrolledWindow:window-placement-set:
 284    *
 285    * Whether "window-placement" should be used to determine the location
 286    * of the contents with respect to the scrollbars. Otherwise, the
 287    * "gtk-scrolled-window-placement" setting is used.
 288    *
 289    * Since: 2.10
 290    */
 291   g_object_class_install_property (gobject_class,
 292                                    PROP_WINDOW_PLACEMENT_SET,
 293                                    g_param_spec_boolean ("window-placement-set",
 294                                                          P_("Window Placement Set"),
 295                                                          P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
 296                                                          FALSE,
 297                                                          GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 298   g_object_class_install_property (gobject_class,
 299                                    PROP_SHADOW_TYPE,
 300                                    g_param_spec_enum ("shadow-type",
 301                                                       P_("Shadow Type"),
 302                                                       P_("Style of bevel around the contents"),
 303                                                       GTK_TYPE_SHADOW_TYPE,
 304                                                       GTK_SHADOW_NONE,
 305                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 306
 307   /**
 308    * GtkScrolledWindow:scrollbars-within-bevel:
 309    *
 310    * Whether to place scrollbars within the scrolled window's bevel.
 311    *
 312    * Since: 2.12
 313    */
 314   gtk_widget_class_install_style_property (widget_class,
 315                                            g_param_spec_boolean ("scrollbars-within-bevel",
 316                                                                  P_("Scrollbars within bevel"),
 317                                                                  P_("Place scrollbars within the scrolled window's bevel"),
 318                                                                  FALSE,
 319                                                                  GTK_PARAM_READABLE));
 320
 321   gtk_widget_class_install_style_property (widget_class,
 322                                            g_param_spec_int ("scrollbar-spacing",
 323                                                              P_("Scrollbar spacing"),
 324                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 325                                                              0,
 326                                                              G_MAXINT,
 327                                                              DEFAULT_SCROLLBAR_SPACING,
 328                                                              GTK_PARAM_READABLE));
 329
 330   /**
 331    * GtkSettings:gtk-scrolled-window-placement:
 332    *
 333    * Where the contents of scrolled windows are located with respect to the
 334    * scrollbars, if not overridden by the scrolled window's own placement.
 335    *
 336    * Since: 2.10
 337    */
 338   gtk_settings_install_property (g_param_spec_enum ("gtk-scrolled-window-placement",
 339                                                     P_("Scrolled Window Placement"),
 340                                                     P_("Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement."),
 341                                                     GTK_TYPE_CORNER_TYPE,
 342                                                     GTK_CORNER_TOP_LEFT,
 343                                                     G_PARAM_READABLE | G_PARAM_WRITABLE));
 344
 345
 346   signals[SCROLL_CHILD] =
 347     g_signal_new (I_("scroll-child"),
 348                   G_TYPE_FROM_CLASS (object_class),
 349                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 350                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 351                   NULL, NULL,
 352                   _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
 353                   G_TYPE_BOOLEAN, 2,
 354                   GTK_TYPE_SCROLL_TYPE,
 355                   G_TYPE_BOOLEAN);
 356   signals[MOVE_FOCUS_OUT] =
 357     g_signal_new (I_("move-focus-out"),
 358                   G_TYPE_FROM_CLASS (object_class),
 359                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 360                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 361                   NULL, NULL,
 362                   _gtk_marshal_VOID__ENUM,
 363                   G_TYPE_NONE, 1,
 364                   GTK_TYPE_DIRECTION_TYPE);
 365
 366   binding_set = gtk_binding_set_by_class (class);
 367
 368   add_scroll_binding (binding_set, GDK_KEY_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 369   add_scroll_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 370   add_scroll_binding (binding_set, GDK_KEY_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 371   add_scroll_binding (binding_set, GDK_KEY_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 372
 373   add_scroll_binding (binding_set, GDK_KEY_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 374   add_scroll_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 375   add_scroll_binding (binding_set, GDK_KEY_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 376   add_scroll_binding (binding_set, GDK_KEY_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 377
 378   add_scroll_binding (binding_set, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 379   add_scroll_binding (binding_set, GDK_KEY_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 380   add_scroll_binding (binding_set, GDK_KEY_Home, 0,                GTK_SCROLL_START, FALSE);
 381   add_scroll_binding (binding_set, GDK_KEY_End,  0,                GTK_SCROLL_END,   FALSE);
 382
 383   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 384   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 385
 386   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 387 }
 388
 389 static void
 390 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 391 {
 392   GtkScrolledWindowPrivate *priv;
 393
 394   scrolled_window->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (scrolled_window,
 395                                                               GTK_TYPE_SCROLLED_WINDOW,
 396                                                               GtkScrolledWindowPrivate);
 397
 398   gtk_widget_set_has_window (GTK_WIDGET (scrolled_window), FALSE);
 399   gtk_widget_set_can_focus (GTK_WIDGET (scrolled_window), TRUE);
 400
 401   priv->hscrollbar = NULL;
 402   priv->vscrollbar = NULL;
 403   priv->hscrollbar_policy = GTK_POLICY_AUTOMATIC;
 404   priv->vscrollbar_policy = GTK_POLICY_AUTOMATIC;
 405   priv->hscrollbar_visible = FALSE;
 406   priv->vscrollbar_visible = FALSE;
 407   priv->focus_out = FALSE;
 408   priv->window_placement = GTK_CORNER_TOP_LEFT;
 409   gtk_scrolled_window_update_real_placement (scrolled_window);
 410 }
 411
 412 /**
 413  * gtk_scrolled_window_new:
 414  * @hadjustment: (allow-none): horizontal adjustment
 415  * @vadjustment: (allow-none): vertical adjustment
 416  *
 417  * Creates a new scrolled window.
 418  *
 419  * The two arguments are the scrolled window's adjustments; these will be
 420  * shared with the scrollbars and the child widget to keep the bars in sync
 421  * with the child. Usually you want to pass %NULL for the adjustments, which
 422  * will cause the scrolled window to create them for you.
 423  *
 424  * Returns: a new scrolled window
 425  */
 426 GtkWidget*
 427 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 428                          GtkAdjustment *vadjustment)
 429 {
 430   GtkWidget *scrolled_window;
 431
 432   if (hadjustment)
 433     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 434
 435   if (vadjustment)
 436     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 437
 438   scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
 439                                     "hadjustment", hadjustment,
 440                                     "vadjustment", vadjustment,
 441                                     NULL);
 442
 443   return scrolled_window;
 444 }
 445
 446 /**
 447  * gtk_scrolled_window_set_hadjustment:
 448  * @scrolled_window: a #GtkScrolledWindow
 449  * @hadjustment: horizontal scroll adjustment
 450  *
 451  * Sets the #GtkAdjustment for the horizontal scrollbar.
 452  */
 453 void
 454 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 455                                      GtkAdjustment     *hadjustment)
 456 {
 457   GtkScrolledWindowPrivate *priv;
 458   GtkBin *bin;
 459   GtkWidget *child;
 460
 461   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 462   if (hadjustment)
 463     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 464   else
 465     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 466
 467   bin = GTK_BIN (scrolled_window);
 468   priv = scrolled_window->priv;
 469
 470   if (!priv->hscrollbar)
 471     {
 472       gtk_widget_push_composite_child ();
 473       priv->hscrollbar = gtk_hscrollbar_new (hadjustment);
 474       gtk_widget_set_composite_name (priv->hscrollbar, "hscrollbar");
 475       gtk_widget_pop_composite_child ();
 476
 477       gtk_widget_set_parent (priv->hscrollbar, GTK_WIDGET (scrolled_window));
 478       g_object_ref (priv->hscrollbar);
 479       gtk_widget_show (priv->hscrollbar);
 480     }
 481   else
 482     {
 483       GtkAdjustment *old_adjustment;
 484
 485       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
 486       if (old_adjustment == hadjustment)
 487         return;
 488
 489       g_signal_handlers_disconnect_by_func (old_adjustment,
 490                                             gtk_scrolled_window_adjustment_changed,
 491                                             scrolled_window);
 492       gtk_range_set_adjustment (GTK_RANGE (priv->hscrollbar),
 493                                 hadjustment);
 494     }
 495   hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
 496   g_signal_connect (hadjustment,
 497                     "changed",
 498                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 499                     scrolled_window);
 500   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 501
 502   child = gtk_bin_get_child (bin);
 503   if (child)
 504     gtk_widget_set_scroll_adjustments (child,
 505                                        gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
 506                                        gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)));
 507
 508   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 509 }
 510
 511 /**
 512  * gtk_scrolled_window_set_vadjustment:
 513  * @scrolled_window: a #GtkScrolledWindow
 514  * @vadjustment: vertical scroll adjustment
 515  *
 516  * Sets the #GtkAdjustment for the vertical scrollbar.
 517  */
 518 void
 519 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 520                                      GtkAdjustment     *vadjustment)
 521 {
 522   GtkScrolledWindowPrivate *priv;
 523   GtkBin *bin;
 524   GtkWidget *child;
 525
 526   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 527   if (vadjustment)
 528     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 529   else
 530     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 531
 532   bin = GTK_BIN (scrolled_window);
 533   priv = scrolled_window->priv;
 534
 535   if (!priv->vscrollbar)
 536     {
 537       gtk_widget_push_composite_child ();
 538       priv->vscrollbar = gtk_vscrollbar_new (vadjustment);
 539       gtk_widget_set_composite_name (priv->vscrollbar, "vscrollbar");
 540       gtk_widget_pop_composite_child ();
 541
 542       gtk_widget_set_parent (priv->vscrollbar, GTK_WIDGET (scrolled_window));
 543       g_object_ref (priv->vscrollbar);
 544       gtk_widget_show (priv->vscrollbar);
 545     }
 546   else
 547     {
 548       GtkAdjustment *old_adjustment;
 549
 550       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
 551       if (old_adjustment == vadjustment)
 552         return;
 553
 554       g_signal_handlers_disconnect_by_func (old_adjustment,
 555                                             gtk_scrolled_window_adjustment_changed,
 556                                             scrolled_window);
 557       gtk_range_set_adjustment (GTK_RANGE (priv->vscrollbar),
 558                                 vadjustment);
 559     }
 560   vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
 561   g_signal_connect (vadjustment,
 562                     "changed",
 563                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 564                     scrolled_window);
 565   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 566
 567   child = gtk_bin_get_child (bin);
 568   if (child)
 569     gtk_widget_set_scroll_adjustments (child,
 570                                        gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
 571                                        gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)));
 572
 573   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 574 }
 575
 576 /**
 577  * gtk_scrolled_window_get_hadjustment:
 578  * @scrolled_window: a #GtkScrolledWindow
 579  *
 580  * Returns the horizontal scrollbar's adjustment, used to connect the
 581  * horizontal scrollbar to the child widget's horizontal scroll
 582  * functionality.
 583  *
 584  * Returns: (transfer none): the horizontal #GtkAdjustment
 585  */
 586 GtkAdjustment*
 587 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 588 {
 589   GtkScrolledWindowPrivate *priv;
 590
 591   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 592
 593   priv = scrolled_window->priv;
 594
 595   return (priv->hscrollbar ?
 596           gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)) :
 597           NULL);
 598 }
 599
 600 /**
 601  * gtk_scrolled_window_get_vadjustment:
 602  * @scrolled_window: a #GtkScrolledWindow
 603  *
 604  * Returns the vertical scrollbar's adjustment, used to connect the
 605  * vertical scrollbar to the child widget's vertical scroll functionality.
 606  *
 607  * Returns: (transfer none): the vertical #GtkAdjustment
 608  */
 609 GtkAdjustment*
 610 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 611 {
 612   GtkScrolledWindowPrivate *priv;
 613
 614   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 615
 616   priv = scrolled_window->priv;
 617
 618   return (priv->vscrollbar ?
 619           gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)) :
 620           NULL);
 621 }
 622
 623 /**
 624  * gtk_scrolled_window_get_hscrollbar:
 625  * @scrolled_window: a #GtkScrolledWindow
 626  *
 627  * Returns the horizontal scrollbar of @scrolled_window.
 628  *
 629  * Returns: (transfer none): the horizontal scrollbar of the scrolled window,
 630  *     or %NULL if it does not have one.
 631  *
 632  * Since: 2.8
 633  */
 634 GtkWidget*
 635 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 636 {
 637   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 638
 639   return scrolled_window->priv->hscrollbar;
 640 }
 641
 642 /**
 643  * gtk_scrolled_window_get_vscrollbar:
 644  * @scrolled_window: a #GtkScrolledWindow
 645  *
 646  * Returns the vertical scrollbar of @scrolled_window.
 647  *
 648  * Returns: (transfer none): the vertical scrollbar of the scrolled window,
 649  *     or %NULL if it does not have one.
 650  *
 651  * Since: 2.8
 652  */
 653 GtkWidget*
 654 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 655 {
 656   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 657
 658   return scrolled_window->priv->vscrollbar;
 659 }
 660
 661 /**
 662  * gtk_scrolled_window_set_policy:
 663  * @scrolled_window: a #GtkScrolledWindow
 664  * @hscrollbar_policy: policy for horizontal bar
 665  * @vscrollbar_policy: policy for vertical bar
 666  *
 667  * Sets the scrollbar policy for the horizontal and vertical scrollbars.
 668  *
 669  * The policy determines when the scrollbar should appear; it is a value
 670  * from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
 671  * scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
 672  * never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
 673  * if needed (that is, if the slider part of the bar would be smaller
 674  * than the trough - the display is larger than the page size).
 675  */
 676 void
 677 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 678                                 GtkPolicyType      hscrollbar_policy,
 679                                 GtkPolicyType      vscrollbar_policy)
 680 {
 681   GtkScrolledWindowPrivate *priv;
 682   GObject *object = G_OBJECT (scrolled_window);
 683
 684   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 685
 686   priv = scrolled_window->priv;
 687
 688   if ((priv->hscrollbar_policy != hscrollbar_policy) ||
 689       (priv->vscrollbar_policy != vscrollbar_policy))
 690     {
 691       priv->hscrollbar_policy = hscrollbar_policy;
 692       priv->vscrollbar_policy = vscrollbar_policy;
 693
 694       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 695
 696       g_object_freeze_notify (object);
 697       g_object_notify (object, "hscrollbar-policy");
 698       g_object_notify (object, "vscrollbar-policy");
 699       g_object_thaw_notify (object);
 700     }
 701 }
 702
 703 /**
 704  * gtk_scrolled_window_get_policy:
 705  * @scrolled_window: a #GtkScrolledWindow
 706  * @hscrollbar_policy: location to store the policy for the horizontal
 707  *     scrollbar, or %NULL.
 708  * @vscrollbar_policy: location to store the policy for the vertical
 709  *     scrollbar, or %NULL.
 710  *
 711  * Retrieves the current policy values for the horizontal and vertical
 712  * scrollbars. See gtk_scrolled_window_set_policy().
 713  */
 714 void
 715 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 716                                 GtkPolicyType     *hscrollbar_policy,
 717                                 GtkPolicyType     *vscrollbar_policy)
 718 {
 719   GtkScrolledWindowPrivate *priv;
 720
 721   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 722
 723   priv = scrolled_window->priv;
 724
 725   if (hscrollbar_policy)
 726     *hscrollbar_policy = priv->hscrollbar_policy;
 727   if (vscrollbar_policy)
 728     *vscrollbar_policy = priv->vscrollbar_policy;
 729 }
 730
 731 static void
 732 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 733 {
 734   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 735   GtkSettings *settings;
 736
 737   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 738
 739   if (priv->window_placement_set || settings == NULL)
 740     priv->real_window_placement = priv->window_placement;
 741   else
 742     g_object_get (settings,
 743                   "gtk-scrolled-window-placement",
 744                   &priv->real_window_placement,
 745                   NULL);
 746 }
 747
 748 static void
 749 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 750                                             GtkCornerType      window_placement)
 751 {
 752   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 753
 754   if (priv->window_placement != window_placement)
 755     {
 756       priv->window_placement = window_placement;
 757
 758       gtk_scrolled_window_update_real_placement (scrolled_window);
 759       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 760
 761       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 762     }
 763 }
 764
 765 static void
 766 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 767                                        gboolean           placement_set,
 768                                        gboolean           emit_resize)
 769 {
 770   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 771
 772   if (priv->window_placement_set != placement_set)
 773     {
 774       priv->window_placement_set = placement_set;
 775
 776       gtk_scrolled_window_update_real_placement (scrolled_window);
 777       if (emit_resize)
 778         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 779
 780       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 781     }
 782 }
 783
 784 /**
 785  * gtk_scrolled_window_set_placement:
 786  * @scrolled_window: a #GtkScrolledWindow
 787  * @window_placement: position of the child window
 788  *
 789  * Sets the placement of the contents with respect to the scrollbars
 790  * for the scrolled window.
 791  *
 792  * The default is %GTK_CORNER_TOP_LEFT, meaning the child is
 793  * in the top left, with the scrollbars underneath and to the right.
 794  * Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
 795  * %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
 796  *
 797  * See also gtk_scrolled_window_get_placement() and
 798  * gtk_scrolled_window_unset_placement().
 799  */
 800 void
 801 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 802                                    GtkCornerType      window_placement)
 803 {
 804   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 805
 806   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 807   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 808 }
 809
 810 /**
 811  * gtk_scrolled_window_get_placement:
 812  * @scrolled_window: a #GtkScrolledWindow
 813  *
 814  * Gets the placement of the contents with respect to the scrollbars
 815  * for the scrolled window. See gtk_scrolled_window_set_placement().
 816  *
 817  * Return value: the current placement value.
 818  *
 819  * See also gtk_scrolled_window_set_placement() and
 820  * gtk_scrolled_window_unset_placement().
 821  **/
 822 GtkCornerType
 823 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 824 {
 825   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 826
 827   return scrolled_window->priv->window_placement;
 828 }
 829
 830 /**
 831  * gtk_scrolled_window_unset_placement:
 832  * @scrolled_window: a #GtkScrolledWindow
 833  *
 834  * Unsets the placement of the contents with respect to the scrollbars
 835  * for the scrolled window. If no window placement is set for a scrolled
 836  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 837  *
 838  * See also gtk_scrolled_window_set_placement() and
 839  * gtk_scrolled_window_get_placement().
 840  *
 841  * Since: 2.10
 842  **/
 843 void
 844 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 845 {
 846   GtkScrolledWindowPrivate *priv;
 847
 848   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 849
 850   priv = scrolled_window->priv;
 851
 852   if (priv->window_placement_set)
 853     {
 854       priv->window_placement_set = FALSE;
 855
 856       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 857
 858       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 859     }
 860 }
 861
 862 /**
 863  * gtk_scrolled_window_set_shadow_type:
 864  * @scrolled_window: a #GtkScrolledWindow
 865  * @type: kind of shadow to draw around scrolled window contents
 866  *
 867  * Changes the type of shadow drawn around the contents of
 868  * @scrolled_window.
 869  *
 870  **/
 871 void
 872 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 873                                      GtkShadowType      type)
 874 {
 875   GtkScrolledWindowPrivate *priv;
 876
 877   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 878   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 879
 880   priv = scrolled_window->priv;
 881
 882   if (priv->shadow_type != type)
 883     {
 884       priv->shadow_type = type;
 885
 886       if (gtk_widget_is_drawable (GTK_WIDGET (scrolled_window)))
 887         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 888
 889       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 890
 891       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 892     }
 893 }
 894
 895 /**
 896  * gtk_scrolled_window_get_shadow_type:
 897  * @scrolled_window: a #GtkScrolledWindow
 898  *
 899  * Gets the shadow type of the scrolled window. See
 900  * gtk_scrolled_window_set_shadow_type().
 901  *
 902  * Return value: the current shadow type
 903  **/
 904 GtkShadowType
 905 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 906 {
 907   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 908
 909   return scrolled_window->priv->shadow_type;
 910 }
 911
 912 static void
 913 gtk_scrolled_window_destroy (GtkObject *object)
 914 {
 915   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 916   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 917
 918   if (priv->hscrollbar)
 919     {
 920       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
 921                                             gtk_scrolled_window_adjustment_changed,
 922                                             scrolled_window);
 923       gtk_widget_unparent (priv->hscrollbar);
 924       gtk_widget_destroy (priv->hscrollbar);
 925       g_object_unref (priv->hscrollbar);
 926       priv->hscrollbar = NULL;
 927     }
 928   if (priv->vscrollbar)
 929     {
 930       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)),
 931                                             gtk_scrolled_window_adjustment_changed,
 932                                             scrolled_window);
 933       gtk_widget_unparent (priv->vscrollbar);
 934       gtk_widget_destroy (priv->vscrollbar);
 935       g_object_unref (priv->vscrollbar);
 936       priv->vscrollbar = NULL;
 937     }
 938
 939   GTK_OBJECT_CLASS (gtk_scrolled_window_parent_class)->destroy (object);
 940 }
 941
 942 static void
 943 gtk_scrolled_window_set_property (GObject      *object,
 944                                   guint         prop_id,
 945                                   const GValue *value,
 946                                   GParamSpec   *pspec)
 947 {
 948   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 949   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 950
 951   switch (prop_id)
 952     {
 953     case PROP_HADJUSTMENT:
 954       gtk_scrolled_window_set_hadjustment (scrolled_window,
 955                                            g_value_get_object (value));
 956       break;
 957     case PROP_VADJUSTMENT:
 958       gtk_scrolled_window_set_vadjustment (scrolled_window,
 959                                            g_value_get_object (value));
 960       break;
 961     case PROP_HSCROLLBAR_POLICY:
 962       gtk_scrolled_window_set_policy (scrolled_window,
 963                                       g_value_get_enum (value),
 964                                       priv->vscrollbar_policy);
 965       break;
 966     case PROP_VSCROLLBAR_POLICY:
 967       gtk_scrolled_window_set_policy (scrolled_window,
 968                                       priv->hscrollbar_policy,
 969                                       g_value_get_enum (value));
 970       break;
 971     case PROP_WINDOW_PLACEMENT:
 972       gtk_scrolled_window_set_placement_internal (scrolled_window,
 973                                                   g_value_get_enum (value));
 974       break;
 975     case PROP_WINDOW_PLACEMENT_SET:
 976       gtk_scrolled_window_set_placement_set (scrolled_window,
 977                                              g_value_get_boolean (value),
 978                                              TRUE);
 979       break;
 980     case PROP_SHADOW_TYPE:
 981       gtk_scrolled_window_set_shadow_type (scrolled_window,
 982                                            g_value_get_enum (value));
 983       break;
 984     default:
 985       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 986       break;
 987     }
 988 }
 989
 990 static void
 991 gtk_scrolled_window_get_property (GObject    *object,
 992                                   guint       prop_id,
 993                                   GValue     *value,
 994                                   GParamSpec *pspec)
 995 {
 996   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 997   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 998
 999   switch (prop_id)
1000     {
1001     case PROP_HADJUSTMENT:
1002       g_value_set_object (value,
1003                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
1004       break;
1005     case PROP_VADJUSTMENT:
1006       g_value_set_object (value,
1007                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
1008       break;
1009     case PROP_HSCROLLBAR_POLICY:
1010       g_value_set_enum (value, priv->hscrollbar_policy);
1011       break;
1012     case PROP_VSCROLLBAR_POLICY:
1013       g_value_set_enum (value, priv->vscrollbar_policy);
1014       break;
1015     case PROP_WINDOW_PLACEMENT:
1016       g_value_set_enum (value, priv->window_placement);
1017       break;
1018     case PROP_WINDOW_PLACEMENT_SET:
1019       g_value_set_boolean (value, priv->window_placement_set);
1020       break;
1021     case PROP_SHADOW_TYPE:
1022       g_value_set_enum (value, priv->shadow_type);
1023       break;
1024     default:
1025       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1026       break;
1027     }
1028 }
1029
1030 static void
1031 traverse_container (GtkWidget *widget,
1032                     gpointer   data)
1033 {
1034   if (GTK_IS_SCROLLED_WINDOW (widget))
1035     {
1036       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1037       gtk_widget_queue_resize (widget);
1038     }
1039   else if (GTK_IS_CONTAINER (widget))
1040     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
1041 }
1042
1043 static void
1044 gtk_scrolled_window_settings_changed (GtkSettings *settings)
1045 {
1046   GList *list, *l;
1047
1048   list = gtk_window_list_toplevels ();
1049
1050   for (l = list; l; l = l->next)
1051     gtk_container_forall (GTK_CONTAINER (l->data),
1052                           traverse_container, NULL);
1053
1054   g_list_free (list);
1055 }
1056
1057 static void
1058 gtk_scrolled_window_screen_changed (GtkWidget *widget,
1059                                     GdkScreen *previous_screen)
1060 {
1061   GtkSettings *settings;
1062   guint window_placement_connection;
1063
1064   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1065
1066   if (!gtk_widget_has_screen (widget))
1067     return;
1068
1069   settings = gtk_widget_get_settings (widget);
1070
1071   window_placement_connection =
1072     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
1073                                          "gtk-scrolled-window-connection"));
1074
1075   if (window_placement_connection)
1076     return;
1077
1078   window_placement_connection =
1079     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
1080                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
1081   g_object_set_data (G_OBJECT (settings),
1082                      I_("gtk-scrolled-window-connection"),
1083                      GUINT_TO_POINTER (window_placement_connection));
1084 }
1085
1086 static gboolean
1087 gtk_scrolled_window_expose (GtkWidget      *widget,
1088                             GdkEventExpose *event)
1089 {
1090   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1091   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1092
1093   if (priv->shadow_type != GTK_SHADOW_NONE)
1094     {
1095       GtkAllocation allocation;
1096       GtkAllocation relative_allocation;
1097       GtkStyle *style;
1098       gboolean scrollbars_within_bevel;
1099
1100       style = gtk_widget_get_style (widget);
1101       gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1102
1103       gtk_widget_get_allocation (widget, &allocation);
1104
1105       if (!scrollbars_within_bevel)
1106         {
1107           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1108
1109           relative_allocation.x -= style->xthickness;
1110           relative_allocation.y -= style->ythickness;
1111           relative_allocation.width += 2 * style->xthickness;
1112           relative_allocation.height += 2 * style->ythickness;
1113         }
1114       else
1115         {
1116           GtkContainer *container = GTK_CONTAINER (widget);
1117           guint border_width;
1118
1119           border_width = gtk_container_get_border_width (container);
1120
1121           relative_allocation.x = border_width;
1122           relative_allocation.y = border_width;
1123           relative_allocation.width = allocation.width - 2 * border_width;
1124           relative_allocation.height = allocation.height - 2 * border_width;
1125         }
1126
1127       gtk_paint_shadow (style,
1128                         gtk_widget_get_window (widget),
1129                         GTK_STATE_NORMAL, priv->shadow_type,
1130                         &event->area, widget, "scrolled_window",
1131                         allocation.x + relative_allocation.x,
1132                         allocation.y + relative_allocation.y,
1133                         relative_allocation.width,
1134                         relative_allocation.height);
1135     }
1136
1137   GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->expose_event (widget, event);
1138
1139   return FALSE;
1140 }
1141
1142 static void
1143 gtk_scrolled_window_forall (GtkContainer *container,
1144                             gboolean      include_internals,
1145                             GtkCallback   callback,
1146                             gpointer      callback_data)
1147 {
1148   GtkScrolledWindowPrivate *priv;
1149   GtkScrolledWindow *scrolled_window;
1150
1151   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1152   g_return_if_fail (callback != NULL);
1153
1154   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
1155                                               include_internals,
1156                                               callback,
1157                                               callback_data);
1158   if (include_internals)
1159     {
1160       scrolled_window = GTK_SCROLLED_WINDOW (container);
1161       priv = scrolled_window->priv;
1162
1163       if (priv->vscrollbar)
1164         callback (priv->vscrollbar, callback_data);
1165       if (priv->hscrollbar)
1166         callback (priv->hscrollbar, callback_data);
1167     }
1168 }
1169
1170 static gboolean
1171 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1172                                   GtkScrollType      scroll,
1173                                   gboolean           horizontal)
1174 {
1175   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1176   GtkAdjustment *adjustment = NULL;
1177
1178   switch (scroll)
1179     {
1180     case GTK_SCROLL_STEP_UP:
1181       scroll = GTK_SCROLL_STEP_BACKWARD;
1182       horizontal = FALSE;
1183       break;
1184     case GTK_SCROLL_STEP_DOWN:
1185       scroll = GTK_SCROLL_STEP_FORWARD;
1186       horizontal = FALSE;
1187       break;
1188     case GTK_SCROLL_STEP_LEFT:
1189       scroll = GTK_SCROLL_STEP_BACKWARD;
1190       horizontal = TRUE;
1191       break;
1192     case GTK_SCROLL_STEP_RIGHT:
1193       scroll = GTK_SCROLL_STEP_FORWARD;
1194       horizontal = TRUE;
1195       break;
1196     case GTK_SCROLL_PAGE_UP:
1197       scroll = GTK_SCROLL_PAGE_BACKWARD;
1198       horizontal = FALSE;
1199       break;
1200     case GTK_SCROLL_PAGE_DOWN:
1201       scroll = GTK_SCROLL_PAGE_FORWARD;
1202       horizontal = FALSE;
1203       break;
1204     case GTK_SCROLL_PAGE_LEFT:
1205       scroll = GTK_SCROLL_STEP_BACKWARD;
1206       horizontal = TRUE;
1207       break;
1208     case GTK_SCROLL_PAGE_RIGHT:
1209       scroll = GTK_SCROLL_STEP_FORWARD;
1210       horizontal = TRUE;
1211       break;
1212     case GTK_SCROLL_STEP_BACKWARD:
1213     case GTK_SCROLL_STEP_FORWARD:
1214     case GTK_SCROLL_PAGE_BACKWARD:
1215     case GTK_SCROLL_PAGE_FORWARD:
1216     case GTK_SCROLL_START:
1217     case GTK_SCROLL_END:
1218       break;
1219     default:
1220       g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
1221       return FALSE;
1222     }
1223
1224   if ((horizontal && (!priv->hscrollbar || !priv->hscrollbar_visible)) ||
1225       (!horizontal && (!priv->vscrollbar || !priv->vscrollbar_visible)))
1226     return FALSE;
1227
1228   if (horizontal)
1229     {
1230       if (priv->hscrollbar)
1231         adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
1232     }
1233   else
1234     {
1235       if (priv->vscrollbar)
1236         adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
1237     }
1238
1239   if (adjustment)
1240     {
1241       gdouble value = adjustment->value;
1242
1243       switch (scroll)
1244         {
1245         case GTK_SCROLL_STEP_FORWARD:
1246           value += adjustment->step_increment;
1247           break;
1248         case GTK_SCROLL_STEP_BACKWARD:
1249           value -= adjustment->step_increment;
1250           break;
1251         case GTK_SCROLL_PAGE_FORWARD:
1252           value += adjustment->page_increment;
1253           break;
1254         case GTK_SCROLL_PAGE_BACKWARD:
1255           value -= adjustment->page_increment;
1256           break;
1257         case GTK_SCROLL_START:
1258           value = adjustment->lower;
1259           break;
1260         case GTK_SCROLL_END:
1261           value = adjustment->upper;
1262           break;
1263         default:
1264           g_assert_not_reached ();
1265           break;
1266         }
1267
1268       gtk_adjustment_set_value (adjustment, value);
1269
1270       return TRUE;
1271     }
1272
1273   return FALSE;
1274 }
1275
1276 static void
1277 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1278                                     GtkDirectionType   direction_type)
1279 {
1280   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1281   GtkWidget *toplevel;
1282
1283   /* Focus out of the scrolled window entirely. We do this by setting
1284    * a flag, then propagating the focus motion to the notebook.
1285    */
1286   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1287   if (!gtk_widget_is_toplevel (toplevel))
1288     return;
1289
1290   g_object_ref (scrolled_window);
1291
1292   priv->focus_out = TRUE;
1293   g_signal_emit_by_name (toplevel, "move-focus", direction_type);
1294   priv->focus_out = FALSE;
1295
1296   g_object_unref (scrolled_window);
1297 }
1298
1299 static void
1300 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1301                                          GtkAllocation *allocation)
1302 {
1303   GtkAllocation widget_allocation;
1304   GtkScrolledWindow *scrolled_window;
1305   GtkScrolledWindowPrivate *priv;
1306   GtkStyle *style;
1307   gint scrollbar_spacing;
1308   guint border_width;
1309
1310   g_return_if_fail (widget != NULL);
1311   g_return_if_fail (allocation != NULL);
1312
1313   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1314   priv = scrolled_window->priv;
1315
1316   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1317
1318   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
1319   allocation->x = border_width;
1320   allocation->y = border_width;
1321
1322   if (priv->shadow_type != GTK_SHADOW_NONE)
1323     {
1324       style = gtk_widget_get_style (widget);
1325       allocation->x += style->xthickness;
1326       allocation->y += style->ythickness;
1327     }
1328
1329   gtk_widget_get_allocation (widget, &widget_allocation);
1330   allocation->width = MAX (1, (gint) widget_allocation.width - allocation->x * 2);
1331   allocation->height = MAX (1, (gint) widget_allocation.height - allocation->y * 2);
1332
1333   if (priv->vscrollbar_visible)
1334     {
1335       GtkRequisition vscrollbar_requisition;
1336       gboolean is_rtl;
1337
1338       gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->vscrollbar),
1339                                  &vscrollbar_requisition, NULL);
1340       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1341
1342       if ((!is_rtl &&
1343            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1344             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1345           (is_rtl &&
1346            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1347             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1348         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1349
1350       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1351     }
1352   if (priv->hscrollbar_visible)
1353     {
1354       GtkRequisition hscrollbar_requisition;
1355
1356       gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->hscrollbar),
1357                                  &hscrollbar_requisition, NULL);
1358
1359       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1360           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1361         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1362
1363       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1364     }
1365 }
1366
1367 static void
1368 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1369                                    GtkAllocation *allocation)
1370 {
1371   GtkScrolledWindow *scrolled_window;
1372   GtkScrolledWindowPrivate *priv;
1373   GtkStyle *style;
1374   GtkBin *bin;
1375   GtkAllocation relative_allocation;
1376   GtkAllocation child_allocation;
1377   GtkWidget *child;
1378   gboolean scrollbars_within_bevel;
1379   gint scrollbar_spacing;
1380   guint border_width;
1381
1382   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1383   g_return_if_fail (allocation != NULL);
1384
1385   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1386   bin = GTK_BIN (scrolled_window);
1387   priv = scrolled_window->priv;
1388
1389   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1390
1391   style = gtk_widget_get_style (widget);
1392   gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1393
1394   border_width = gtk_container_get_border_width (GTK_CONTAINER (scrolled_window));
1395
1396   gtk_widget_set_allocation (widget, allocation);
1397
1398   if (priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
1399     priv->hscrollbar_visible = TRUE;
1400   else if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
1401     priv->hscrollbar_visible = FALSE;
1402   if (priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
1403     priv->vscrollbar_visible = TRUE;
1404   else if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
1405     priv->vscrollbar_visible = FALSE;
1406
1407   child = gtk_bin_get_child (bin);
1408   if (child && gtk_widget_get_visible (child))
1409     {
1410       gboolean previous_hvis;
1411       gboolean previous_vvis;
1412       guint count = 0;
1413
1414       do
1415         {
1416           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1417
1418           child_allocation.x = relative_allocation.x + allocation->x;
1419           child_allocation.y = relative_allocation.y + allocation->y;
1420           child_allocation.width = relative_allocation.width;
1421           child_allocation.height = relative_allocation.height;
1422
1423           previous_hvis = priv->hscrollbar_visible;
1424           previous_vvis = priv->vscrollbar_visible;
1425
1426           gtk_widget_size_allocate (child, &child_allocation);
1427
1428           /* If, after the first iteration, the hscrollbar and the
1429            * vscrollbar flip visiblity, then we need both.
1430            */
1431           if (count &&
1432               previous_hvis != priv->hscrollbar_visible &&
1433               previous_vvis != priv->vscrollbar_visible)
1434             {
1435               priv->hscrollbar_visible = TRUE;
1436               priv->vscrollbar_visible = TRUE;
1437
1438               /* a new resize is already queued at this point,
1439                * so we will immediatedly get reinvoked
1440                */
1441               return;
1442             }
1443
1444           count++;
1445         }
1446       while (previous_hvis != priv->hscrollbar_visible ||
1447              previous_vvis != priv->vscrollbar_visible);
1448     }
1449   else
1450     {
1451       priv->hscrollbar_visible = priv->hscrollbar_policy == GTK_POLICY_ALWAYS;
1452       priv->vscrollbar_visible = priv->vscrollbar_policy == GTK_POLICY_ALWAYS;
1453       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1454     }
1455
1456   if (priv->hscrollbar_visible)
1457     {
1458       GtkRequisition hscrollbar_requisition;
1459
1460       gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->hscrollbar),
1461                                  &hscrollbar_requisition, NULL);
1462
1463       if (!gtk_widget_get_visible (priv->hscrollbar))
1464         gtk_widget_show (priv->hscrollbar);
1465
1466       child_allocation.x = relative_allocation.x;
1467       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1468           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1469         child_allocation.y = (relative_allocation.y +
1470                               relative_allocation.height +
1471                               scrollbar_spacing +
1472                               (priv->shadow_type == GTK_SHADOW_NONE ?
1473                                0 : style->ythickness));
1474       else
1475         child_allocation.y = border_width;
1476
1477       child_allocation.width = relative_allocation.width;
1478       child_allocation.height = hscrollbar_requisition.height;
1479       child_allocation.x += allocation->x;
1480       child_allocation.y += allocation->y;
1481
1482       if (priv->shadow_type != GTK_SHADOW_NONE)
1483         {
1484           if (!scrollbars_within_bevel)
1485             {
1486               child_allocation.x -= style->xthickness;
1487               child_allocation.width += 2 * style->xthickness;
1488             }
1489           else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
1490                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1491             {
1492               child_allocation.y -= style->ythickness;
1493             }
1494           else
1495             {
1496               child_allocation.y += style->ythickness;
1497             }
1498         }
1499
1500       gtk_widget_size_allocate (priv->hscrollbar, &child_allocation);
1501     }
1502   else if (gtk_widget_get_visible (priv->hscrollbar))
1503     gtk_widget_hide (priv->hscrollbar);
1504
1505   if (priv->vscrollbar_visible)
1506     {
1507       GtkRequisition vscrollbar_requisition;
1508       if (!gtk_widget_get_visible (priv->vscrollbar))
1509         gtk_widget_show (priv->vscrollbar);
1510
1511       gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->vscrollbar),
1512                                  &vscrollbar_requisition, NULL);
1513
1514       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1515            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1516             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1517           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1518            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1519             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1520         child_allocation.x = (relative_allocation.x +
1521                               relative_allocation.width +
1522                               scrollbar_spacing +
1523                               (priv->shadow_type == GTK_SHADOW_NONE ?
1524                                0 : style->xthickness));
1525       else
1526         child_allocation.x = border_width;
1527
1528       child_allocation.y = relative_allocation.y;
1529       child_allocation.width = vscrollbar_requisition.width;
1530       child_allocation.height = relative_allocation.height;
1531       child_allocation.x += allocation->x;
1532       child_allocation.y += allocation->y;
1533
1534       if (priv->shadow_type != GTK_SHADOW_NONE)
1535         {
1536           if (!scrollbars_within_bevel)
1537             {
1538               child_allocation.y -= style->ythickness;
1539               child_allocation.height += 2 * style->ythickness;
1540             }
1541           else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
1542                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1543             {
1544               child_allocation.x -= style->xthickness;
1545             }
1546           else
1547             {
1548               child_allocation.x += style->xthickness;
1549             }
1550         }
1551
1552       gtk_widget_size_allocate (priv->vscrollbar, &child_allocation);
1553     }
1554   else if (gtk_widget_get_visible (priv->vscrollbar))
1555     gtk_widget_hide (priv->vscrollbar);
1556 }
1557
1558 static gboolean
1559 gtk_scrolled_window_scroll_event (GtkWidget      *widget,
1560                                   GdkEventScroll *event)
1561 {
1562   GtkScrolledWindowPrivate *priv;
1563   GtkScrolledWindow *scrolled_window;
1564   GtkWidget *range;
1565
1566   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1567   g_return_val_if_fail (event != NULL, FALSE);
1568
1569   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1570   priv = scrolled_window->priv;
1571
1572   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1573     range = priv->vscrollbar;
1574   else
1575     range = priv->hscrollbar;
1576
1577   if (range && gtk_widget_get_visible (range))
1578     {
1579       GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range));
1580       gdouble delta;
1581
1582       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1583
1584       gtk_adjustment_set_value (adj, adj->value + delta);
1585
1586       return TRUE;
1587     }
1588
1589   return FALSE;
1590 }
1591
1592 static gboolean
1593 gtk_scrolled_window_focus (GtkWidget        *widget,
1594                            GtkDirectionType  direction)
1595 {
1596   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1597   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1598   GtkWidget *child;
1599   gboolean had_focus_child;
1600
1601   had_focus_child = gtk_container_get_focus_child (GTK_CONTAINER (widget)) != NULL;
1602
1603   if (priv->focus_out)
1604     {
1605       priv->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1606       return FALSE;
1607     }
1608
1609   if (gtk_widget_is_focus (widget))
1610     return FALSE;
1611
1612   /* We only put the scrolled window itself in the focus chain if it
1613    * isn't possible to focus any children.
1614    */
1615   child = gtk_bin_get_child (GTK_BIN (widget));
1616   if (child)
1617     {
1618       if (gtk_widget_child_focus (child, direction))
1619         return TRUE;
1620     }
1621
1622   if (!had_focus_child && gtk_widget_get_can_focus (widget))
1623     {
1624       gtk_widget_grab_focus (widget);
1625       return TRUE;
1626     }
1627   else
1628     return FALSE;
1629 }
1630
1631 static void
1632 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1633                                         gpointer       data)
1634 {
1635   GtkScrolledWindowPrivate *priv;;
1636   GtkScrolledWindow *scrolled_window;
1637
1638   g_return_if_fail (adjustment != NULL);
1639   g_return_if_fail (data != NULL);
1640
1641   scrolled_window = GTK_SCROLLED_WINDOW (data);
1642   priv = scrolled_window->priv;
1643
1644   if (priv->hscrollbar &&
1645       adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
1646     {
1647       if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1648         {
1649           gboolean visible;
1650
1651           visible = priv->hscrollbar_visible;
1652           priv->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1653                                               adjustment->page_size);
1654           if (priv->hscrollbar_visible != visible)
1655             gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
1656         }
1657     }
1658   else if (priv->vscrollbar &&
1659            adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
1660     {
1661       if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1662         {
1663           gboolean visible;
1664
1665           visible = priv->vscrollbar_visible;
1666           priv->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1667                                               adjustment->page_size);
1668           if (priv->vscrollbar_visible != visible)
1669             gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
1670         }
1671     }
1672 }
1673
1674 static void
1675 gtk_scrolled_window_add (GtkContainer *container,
1676                          GtkWidget    *child)
1677 {
1678   GtkScrolledWindowPrivate *priv;
1679   GtkScrolledWindow *scrolled_window;
1680   GtkBin *bin;
1681   GtkWidget *child_widget;
1682
1683   bin = GTK_BIN (container);
1684   child_widget = gtk_bin_get_child (bin);
1685   g_return_if_fail (child_widget == NULL);
1686
1687   scrolled_window = GTK_SCROLLED_WINDOW (container);
1688   priv = scrolled_window->priv;
1689
1690   _gtk_bin_set_child (bin, child);
1691   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1692
1693   /* this is a temporary message */
1694   if (!gtk_widget_set_scroll_adjustments (child,
1695                                           gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
1696                                           gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar))))
1697     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1698                "use gtk_scrolled_window_add_with_viewport() instead");
1699 }
1700
1701 static void
1702 gtk_scrolled_window_remove (GtkContainer *container,
1703                             GtkWidget    *child)
1704 {
1705   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1706   g_return_if_fail (child != NULL);
1707   g_return_if_fail (gtk_bin_get_child (GTK_BIN (container)) == child);
1708
1709   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1710
1711   /* chain parent class handler to remove child */
1712   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1713 }
1714
1715 /**
1716  * gtk_scrolled_window_add_with_viewport:
1717  * @scrolled_window: a #GtkScrolledWindow
1718  * @child: the widget you want to scroll
1719  *
1720  * Used to add children without native scrolling capabilities. This
1721  * is simply a convenience function; it is equivalent to adding the
1722  * unscrollable child to a viewport, then adding the viewport to the
1723  * scrolled window. If a child has native scrolling, use
1724  * gtk_container_add() instead of this function.
1725  *
1726  * The viewport scrolls the child by moving its #GdkWindow, and takes
1727  * the size of the child to be the size of its toplevel #GdkWindow.
1728  * This will be very wrong for most widgets that support native scrolling;
1729  * for example, if you add a widget such as #GtkTreeView with a viewport,
1730  * the whole widget will scroll, including the column headings. Thus,
1731  * widgets with native scrolling support should not be used with the
1732  * #GtkViewport proxy.
1733  *
1734  * A widget supports scrolling natively if the
1735  * set_scroll_adjustments_signal field in #GtkWidgetClass is non-zero,
1736  * i.e. has been filled in with a valid signal identifier.
1737  */
1738 void
1739 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1740                                        GtkWidget         *child)
1741 {
1742   GtkBin *bin;
1743   GtkWidget *viewport;
1744   GtkWidget *child_widget;
1745
1746   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1747   g_return_if_fail (GTK_IS_WIDGET (child));
1748   g_return_if_fail (gtk_widget_get_parent (child) == NULL);
1749
1750   bin = GTK_BIN (scrolled_window);
1751   child_widget = gtk_bin_get_child (bin);
1752
1753   if (child_widget)
1754     {
1755       g_return_if_fail (GTK_IS_VIEWPORT (child_widget));
1756       g_return_if_fail (gtk_bin_get_child (GTK_BIN (child_widget)) == NULL);
1757
1758       viewport = child_widget;
1759     }
1760   else
1761     {
1762       viewport =
1763         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1764                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1765       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1766     }
1767
1768   gtk_widget_show (viewport);
1769   gtk_container_add (GTK_CONTAINER (viewport), child);
1770 }
1771
1772 /*
1773  * _gtk_scrolled_window_get_spacing:
1774  * @scrolled_window: a scrolled window
1775  *
1776  * Gets the spacing between the scrolled window's scrollbars and
1777  * the scrolled widget. Used by GtkCombo
1778  *
1779  * Return value: the spacing, in pixels.
1780  */
1781 gint
1782 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1783 {
1784   GtkScrolledWindowClass *class;
1785
1786   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1787
1788   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1789
1790   if (class->scrollbar_spacing >= 0)
1791     return class->scrollbar_spacing;
1792   else
1793     {
1794       gint scrollbar_spacing;
1795
1796       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1797                             "scrollbar-spacing", &scrollbar_spacing,
1798                             NULL);
1799
1800       return scrollbar_spacing;
1801     }
1802 }
1803
1804
1805 static void
1806 gtk_scrolled_window_size_request_init (GtkSizeRequestIface *iface)
1807 {
1808   iface->get_width            = gtk_scrolled_window_get_width;
1809   iface->get_height           = gtk_scrolled_window_get_height;
1810   iface->get_height_for_width = gtk_scrolled_window_get_height_for_width;
1811   iface->get_width_for_height = gtk_scrolled_window_get_width_for_height;
1812 }
1813
1814 static void
1815 gtk_scrolled_window_get_size (GtkSizeRequest *widget,
1816                               GtkOrientation  orientation,
1817                               gint           *minimum_size,
1818                               gint           *natural_size)
1819 {
1820   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1821   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1822   GtkBin *bin = GTK_BIN (scrolled_window);
1823   gint extra_width;
1824   gint extra_height;
1825   gint scrollbar_spacing;
1826   GtkRequisition hscrollbar_requisition;
1827   GtkRequisition vscrollbar_requisition;
1828   GtkRequisition minimum_req, natural_req;
1829   GtkStyle *style;
1830   GtkWidget *child;
1831   gint min_child_size, nat_child_size;
1832   guint border_width;
1833
1834   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1835
1836   extra_width = 0;
1837   extra_height = 0;
1838   minimum_req.width = 0;
1839   minimum_req.height = 0;
1840   natural_req.width = 0;
1841   natural_req.height = 0;
1842
1843   gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->hscrollbar),
1844                              &hscrollbar_requisition, NULL);
1845   gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->vscrollbar),
1846                              &vscrollbar_requisition, NULL);
1847
1848   child = gtk_bin_get_child (bin);
1849   if (child && gtk_widget_get_visible (child))
1850     {
1851       if (orientation == GTK_ORIENTATION_HORIZONTAL)
1852         {
1853           gtk_size_request_get_width (GTK_SIZE_REQUEST (child),
1854                                       &min_child_size,
1855                                       &nat_child_size);
1856
1857           if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
1858             {
1859               minimum_req.width += min_child_size;
1860               natural_req.width += nat_child_size;
1861             }
1862           else
1863             {
1864               GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (child, FALSE);
1865
1866               if (aux_info && aux_info->width > 0)
1867                 {
1868                   minimum_req.width += aux_info->width;
1869                   natural_req.width += aux_info->width;
1870                   extra_width = -1;
1871                 }
1872               else
1873                 {
1874                   minimum_req.width += vscrollbar_requisition.width;
1875                   natural_req.width += vscrollbar_requisition.width;
1876                 }
1877             }
1878         }
1879       else /* GTK_ORIENTATION_VERTICAL */
1880         {
1881           gtk_size_request_get_height (GTK_SIZE_REQUEST (child),
1882                                        &min_child_size,
1883                                        &nat_child_size);
1884
1885           if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
1886             {
1887               minimum_req.height += min_child_size;
1888               natural_req.height += nat_child_size;
1889             }
1890           else
1891             {
1892               GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (child, FALSE);
1893
1894               if (aux_info && aux_info->height > 0)
1895                 {
1896                   minimum_req.height += aux_info->height;
1897                   natural_req.height += aux_info->height;
1898                   extra_height = -1;
1899                 }
1900               else
1901                 {
1902                   minimum_req.height += hscrollbar_requisition.height;
1903                   natural_req.height += hscrollbar_requisition.height;
1904                 }
1905             }
1906         }
1907     }
1908
1909   if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1910       priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
1911     {
1912       minimum_req.width = MAX (minimum_req.width, hscrollbar_requisition.width);
1913       natural_req.width = MAX (natural_req.width, hscrollbar_requisition.width);
1914       if (!extra_height || priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
1915         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1916     }
1917
1918   if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1919       priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
1920     {
1921       minimum_req.height = MAX (minimum_req.height, vscrollbar_requisition.height);
1922       natural_req.height = MAX (natural_req.height, vscrollbar_requisition.height);
1923       if (!extra_height || priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
1924         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1925     }
1926
1927   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
1928   minimum_req.width += border_width * 2 + MAX (0, extra_width);
1929   minimum_req.height += border_width * 2 + MAX (0, extra_height);
1930   natural_req.width += border_width * 2 + MAX (0, extra_width);
1931   natural_req.height += border_width * 2 + MAX (0, extra_height);
1932
1933   if (priv->shadow_type != GTK_SHADOW_NONE)
1934     {
1935       style = gtk_widget_get_style (GTK_WIDGET (widget));
1936       minimum_req.width += 2 * style->xthickness;
1937       minimum_req.height += 2 * style->ythickness;
1938       natural_req.width += 2 * style->xthickness;
1939       natural_req.height += 2 * style->ythickness;
1940     }
1941
1942   if (orientation == GTK_ORIENTATION_HORIZONTAL)
1943     {
1944       if (minimum_size)
1945         *minimum_size = minimum_req.width;
1946       if (natural_size)
1947         *natural_size = natural_req.width;
1948     }
1949   else
1950     {
1951       if (minimum_size)
1952         *minimum_size = minimum_req.height;
1953       if (natural_size)
1954         *natural_size = natural_req.height;
1955     }
1956 }
1957
1958 static void
1959 gtk_scrolled_window_get_width (GtkSizeRequest      *widget,
1960                                gint                   *minimum_size,
1961                                gint                   *natural_size)
1962 {
1963   gtk_scrolled_window_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
1964 }
1965
1966 static void
1967 gtk_scrolled_window_get_height (GtkSizeRequest      *widget,
1968                                 gint                *minimum_size,
1969                                 gint                *natural_size)
1970 {
1971   gtk_scrolled_window_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
1972 }
1973
1974 static void
1975 gtk_scrolled_window_get_height_for_width (GtkSizeRequest *widget,
1976                                           gint            width,
1977                                           gint           *minimum_height,
1978                                           gint           *natural_height)
1979 {
1980   g_return_if_fail (GTK_IS_WIDGET (widget));
1981
1982   GTK_SIZE_REQUEST_GET_IFACE (widget)->get_height (widget, minimum_height, natural_height);
1983 }
1984
1985 static void
1986 gtk_scrolled_window_get_width_for_height (GtkSizeRequest *widget,
1987                                           gint       height,
1988                                           gint      *minimum_width,
1989                                           gint      *natural_width)
1990 {
1991   g_return_if_fail (GTK_IS_WIDGET (widget));
1992
1993   GTK_SIZE_REQUEST_GET_IFACE (widget)->get_width (widget, minimum_width, natural_width);
1994 }