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 "gtkscrollable.h"
  33 #include "gtkscrolledwindow.h"
  34 #include "gtkwindow.h"
  35 #include "gtktypeutils.h"
  36 #include "gtkprivate.h"
  37 #include "gtkintl.h"
  38
  39
  40 /**
  41  * SECTION:gtkscrolledwindow
  42  * @Short_description: Adds scrollbars to its child widget
  43  * @Title: GtkScrolledWindow
  44  * @See_also: #GtkScrollable, #GtkViewport, #GtkAdjustment
  45  *
  46  * #GtkScrolledWindow is a #GtkBin subclass: it's a container
  47  * the accepts a single child widget. #GtkScrolledWindow adds scrollbars
  48  * to the child widget and optionally draws a beveled frame around the
  49  * child widget.
  50  *
  51  * The scrolled window can work in two ways. Some widgets have native
  52  * scrolling support; these widgets implement the #GtkScrollable interface.
  53  * Widgets with native scroll support include #GtkTreeView, #GtkTextView,
  54  * and #GtkLayout.
  55  *
  56  * For widgets that lack native scrolling support, the #GtkViewport
  57  * widget acts as an adaptor class, implementing scrollability for child
  58  * widgets that lack their own scrolling capabilities. Use #GtkViewport
  59  * to scroll child widgets such as #GtkTable, #GtkBox, and so on.
  60  *
  61  * If a widget has native scrolling abilities, it can be added to the
  62  * #GtkScrolledWindow with gtk_container_add(). If a widget does not, you
  63  * must first add the widget to a #GtkViewport, then add the #GtkViewport
  64  * to the scrolled window. The convenience function
  65  * gtk_scrolled_window_add_with_viewport() does exactly this, so you can
  66  * ignore the presence of the viewport.
  67  *
  68  * The position of the scrollbars is controlled by the scroll
  69  * adjustments. See #GtkAdjustment for the fields in an adjustment - for
  70  * #GtkScrollbar, used by #GtkScrolledWindow, the "value" field
  71  * represents the position of the scrollbar, which must be between the
  72  * "lower" field and "upper - page_size." The "page_size" field
  73  * represents the size of the visible scrollable area. The
  74  * "step_increment" and "page_increment" fields are used when the user
  75  * asks to step down (using the small stepper arrows) or page down (using
  76  * for example the PageDown key).
  77  *
  78  * If a #GtkScrolledWindow doesn't behave quite as you would like, or
  79  * doesn't have exactly the right layout, it's very possible to set up
  80  * your own scrolling with #GtkScrollbar and for example a #GtkTable.
  81  */
  82
  83
  84 /* scrolled window policy and size requisition handling:
  85  *
  86  * gtk size requisition works as follows:
  87  *   a widget upon size-request reports the width and height that it finds
  88  *   to be best suited to display its contents, including children.
  89  *   the width and/or height reported from a widget upon size requisition
  90  *   may be overidden by the user by specifying a width and/or height
  91  *   other than 0 through gtk_widget_set_size_request().
  92  *
  93  * a scrolled window needs (for implementing all three policy types) to
  94  * request its width and height based on two different rationales.
  95  * 1)   the user wants the scrolled window to just fit into the space
  96  *      that it gets allocated for a specifc dimension.
  97  * 1.1) this does not apply if the user specified a concrete value
  98  *      value for that specific dimension by either specifying usize for the
  99  *      scrolled window or for its child.
 100  * 2)   the user wants the scrolled window to take as much space up as
 101  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
 102  *
 103  * also, kinda obvious:
 104  * 3)   a user would certainly not have choosen a scrolled window as a container
 105  *      for the child, if the resulting allocation takes up more space than the
 106  *      child would have allocated without the scrolled window.
 107  *
 108  * conclusions:
 109  * A) from 1) follows: the scrolled window shouldn't request more space for a
 110  *    specifc dimension than is required at minimum.
 111  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
 112  *    window (done automatically) or by usize of the child (needs to be checked).
 113  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
 114  *    child's dimension.
 115  * D) from 3) follows: the scrolled window child's minimum width and minimum height
 116  *    under A) at least correspond to the space taken up by its scrollbars.
 117  */
 118
 119 #define DEFAULT_SCROLLBAR_SPACING  3
 120
 121 struct _GtkScrolledWindowPrivate
 122 {
 123   GtkCornerType  real_window_placement;
 124   GtkWidget     *hscrollbar;
 125   GtkWidget     *vscrollbar;
 126
 127   gboolean window_placement_set;
 128
 129   guint16  shadow_type;
 130
 131   guint    hscrollbar_policy      : 2;
 132   guint    vscrollbar_policy      : 2;
 133   guint    hscrollbar_visible     : 1;
 134   guint    vscrollbar_visible     : 1;
 135   guint    window_placement       : 2;
 136   guint    focus_out              : 1;   /* Flag used by ::move-focus-out implementation */
 137
 138   gint     min_content_width;
 139   gint     min_content_height;
 140 };
 141
 142
 143 enum {
 144   PROP_0,
 145   PROP_HADJUSTMENT,
 146   PROP_VADJUSTMENT,
 147   PROP_HSCROLLBAR_POLICY,
 148   PROP_VSCROLLBAR_POLICY,
 149   PROP_WINDOW_PLACEMENT,
 150   PROP_WINDOW_PLACEMENT_SET,
 151   PROP_SHADOW_TYPE,
 152   PROP_MIN_CONTENT_WIDTH,
 153   PROP_MIN_CONTENT_HEIGHT
 154 };
 155
 156 /* Signals */
 157 enum
 158 {
 159   SCROLL_CHILD,
 160   MOVE_FOCUS_OUT,
 161   LAST_SIGNAL
 162 };
 163
 164 static void     gtk_scrolled_window_set_property       (GObject           *object,
 165                                                         guint              prop_id,
 166                                                         const GValue      *value,
 167                                                         GParamSpec        *pspec);
 168 static void     gtk_scrolled_window_get_property       (GObject           *object,
 169                                                         guint              prop_id,
 170                                                         GValue            *value,
 171                                                         GParamSpec        *pspec);
 172
 173 static void     gtk_scrolled_window_destroy            (GtkWidget         *widget);
 174 static void     gtk_scrolled_window_screen_changed     (GtkWidget         *widget,
 175                                                         GdkScreen         *previous_screen);
 176 static gboolean gtk_scrolled_window_draw               (GtkWidget         *widget,
 177                                                         cairo_t           *cr);
 178 static void     gtk_scrolled_window_size_allocate      (GtkWidget         *widget,
 179                                                         GtkAllocation     *allocation);
 180 static gboolean gtk_scrolled_window_scroll_event       (GtkWidget         *widget,
 181                                                         GdkEventScroll    *event);
 182 static gboolean gtk_scrolled_window_focus              (GtkWidget         *widget,
 183                                                         GtkDirectionType   direction);
 184 static void     gtk_scrolled_window_add                (GtkContainer      *container,
 185                                                         GtkWidget         *widget);
 186 static void     gtk_scrolled_window_remove             (GtkContainer      *container,
 187                                                         GtkWidget         *widget);
 188 static void     gtk_scrolled_window_forall             (GtkContainer      *container,
 189                                                         gboolean           include_internals,
 190                                                         GtkCallback        callback,
 191                                                         gpointer           callback_data);
 192 static gboolean gtk_scrolled_window_scroll_child       (GtkScrolledWindow *scrolled_window,
 193                                                         GtkScrollType      scroll,
 194                                                         gboolean           horizontal);
 195 static void     gtk_scrolled_window_move_focus_out     (GtkScrolledWindow *scrolled_window,
 196                                                         GtkDirectionType   direction_type);
 197
 198 static void     gtk_scrolled_window_relative_allocation(GtkWidget         *widget,
 199                                                         GtkAllocation     *allocation);
 200 static void     gtk_scrolled_window_adjustment_changed (GtkAdjustment     *adjustment,
 201                                                         gpointer           data);
 202
 203 static void  gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window);
 204
 205 static void  gtk_scrolled_window_get_preferred_width   (GtkWidget           *widget,
 206                                                         gint                *minimum_size,
 207                                                         gint                *natural_size);
 208 static void  gtk_scrolled_window_get_preferred_height  (GtkWidget           *widget,
 209                                                         gint                *minimum_size,
 210                                                         gint                *natural_size);
 211 static void  gtk_scrolled_window_get_preferred_height_for_width  (GtkWidget           *layout,
 212                                                         gint                 width,
 213                                                         gint                *minimum_height,
 214                                                         gint                *natural_height);
 215 static void  gtk_scrolled_window_get_preferred_width_for_height  (GtkWidget           *layout,
 216                                                         gint                 width,
 217                                                         gint                *minimum_height,
 218                                                         gint                *natural_height);
 219
 220 static guint signals[LAST_SIGNAL] = {0};
 221
 222 G_DEFINE_TYPE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN)
 223
 224
 225 static void
 226 add_scroll_binding (GtkBindingSet  *binding_set,
 227                     guint           keyval,
 228                     GdkModifierType mask,
 229                     GtkScrollType   scroll,
 230                     gboolean        horizontal)
 231 {
 232   guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left;
 233
 234   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 235                                 "scroll-child", 2,
 236                                 GTK_TYPE_SCROLL_TYPE, scroll,
 237                                 G_TYPE_BOOLEAN, horizontal);
 238   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 239                                 "scroll-child", 2,
 240                                 GTK_TYPE_SCROLL_TYPE, scroll,
 241                                 G_TYPE_BOOLEAN, horizontal);
 242 }
 243
 244 static void
 245 add_tab_bindings (GtkBindingSet    *binding_set,
 246                   GdkModifierType   modifiers,
 247                   GtkDirectionType  direction)
 248 {
 249   gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers,
 250                                 "move-focus-out", 1,
 251                                 GTK_TYPE_DIRECTION_TYPE, direction);
 252   gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers,
 253                                 "move-focus-out", 1,
 254                                 GTK_TYPE_DIRECTION_TYPE, direction);
 255 }
 256
 257 static void
 258 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 259 {
 260   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 261   GtkWidgetClass *widget_class;
 262   GtkContainerClass *container_class;
 263   GtkBindingSet *binding_set;
 264
 265   widget_class = (GtkWidgetClass*) class;
 266   container_class = (GtkContainerClass*) class;
 267
 268   gobject_class->set_property = gtk_scrolled_window_set_property;
 269   gobject_class->get_property = gtk_scrolled_window_get_property;
 270
 271   widget_class->destroy = gtk_scrolled_window_destroy;
 272   widget_class->screen_changed = gtk_scrolled_window_screen_changed;
 273   widget_class->draw = gtk_scrolled_window_draw;
 274   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 275   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 276   widget_class->focus = gtk_scrolled_window_focus;
 277   widget_class->get_preferred_width = gtk_scrolled_window_get_preferred_width;
 278   widget_class->get_preferred_height = gtk_scrolled_window_get_preferred_height;
 279   widget_class->get_preferred_height_for_width = gtk_scrolled_window_get_preferred_height_for_width;
 280   widget_class->get_preferred_width_for_height = gtk_scrolled_window_get_preferred_width_for_height;
 281
 282   container_class->add = gtk_scrolled_window_add;
 283   container_class->remove = gtk_scrolled_window_remove;
 284   container_class->forall = gtk_scrolled_window_forall;
 285   gtk_container_class_handle_border_width (container_class);
 286
 287   class->scrollbar_spacing = -1;
 288
 289   class->scroll_child = gtk_scrolled_window_scroll_child;
 290   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 291
 292   g_object_class_install_property (gobject_class,
 293                                    PROP_HADJUSTMENT,
 294                                    g_param_spec_object ("hadjustment",
 295                                                         P_("Horizontal Adjustment"),
 296                                                         P_("The GtkAdjustment for the horizontal position"),
 297                                                         GTK_TYPE_ADJUSTMENT,
 298                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 299   g_object_class_install_property (gobject_class,
 300                                    PROP_VADJUSTMENT,
 301                                    g_param_spec_object ("vadjustment",
 302                                                         P_("Vertical Adjustment"),
 303                                                         P_("The GtkAdjustment for the vertical position"),
 304                                                         GTK_TYPE_ADJUSTMENT,
 305                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 306   g_object_class_install_property (gobject_class,
 307                                    PROP_HSCROLLBAR_POLICY,
 308                                    g_param_spec_enum ("hscrollbar-policy",
 309                                                       P_("Horizontal Scrollbar Policy"),
 310                                                       P_("When the horizontal scrollbar is displayed"),
 311                                                       GTK_TYPE_POLICY_TYPE,
 312                                                       GTK_POLICY_AUTOMATIC,
 313                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 314   g_object_class_install_property (gobject_class,
 315                                    PROP_VSCROLLBAR_POLICY,
 316                                    g_param_spec_enum ("vscrollbar-policy",
 317                                                       P_("Vertical Scrollbar Policy"),
 318                                                       P_("When the vertical scrollbar is displayed"),
 319                                                       GTK_TYPE_POLICY_TYPE,
 320                                                       GTK_POLICY_AUTOMATIC,
 321                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 322
 323   g_object_class_install_property (gobject_class,
 324                                    PROP_WINDOW_PLACEMENT,
 325                                    g_param_spec_enum ("window-placement",
 326                                                       P_("Window Placement"),
 327                                                       P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
 328                                                       GTK_TYPE_CORNER_TYPE,
 329                                                       GTK_CORNER_TOP_LEFT,
 330                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 331
 332   /**
 333    * GtkScrolledWindow:window-placement-set:
 334    *
 335    * Whether "window-placement" should be used to determine the location
 336    * of the contents with respect to the scrollbars. Otherwise, the
 337    * "gtk-scrolled-window-placement" setting is used.
 338    *
 339    * Since: 2.10
 340    */
 341   g_object_class_install_property (gobject_class,
 342                                    PROP_WINDOW_PLACEMENT_SET,
 343                                    g_param_spec_boolean ("window-placement-set",
 344                                                          P_("Window Placement Set"),
 345                                                          P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
 346                                                          FALSE,
 347                                                          GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 348   g_object_class_install_property (gobject_class,
 349                                    PROP_SHADOW_TYPE,
 350                                    g_param_spec_enum ("shadow-type",
 351                                                       P_("Shadow Type"),
 352                                                       P_("Style of bevel around the contents"),
 353                                                       GTK_TYPE_SHADOW_TYPE,
 354                                                       GTK_SHADOW_NONE,
 355                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 356
 357   /**
 358    * GtkScrolledWindow:scrollbars-within-bevel:
 359    *
 360    * Whether to place scrollbars within the scrolled window's bevel.
 361    *
 362    * Since: 2.12
 363    */
 364   gtk_widget_class_install_style_property (widget_class,
 365                                            g_param_spec_boolean ("scrollbars-within-bevel",
 366                                                                  P_("Scrollbars within bevel"),
 367                                                                  P_("Place scrollbars within the scrolled window's bevel"),
 368                                                                  FALSE,
 369                                                                  GTK_PARAM_READABLE));
 370
 371   gtk_widget_class_install_style_property (widget_class,
 372                                            g_param_spec_int ("scrollbar-spacing",
 373                                                              P_("Scrollbar spacing"),
 374                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 375                                                              0,
 376                                                              G_MAXINT,
 377                                                              DEFAULT_SCROLLBAR_SPACING,
 378                                                              GTK_PARAM_READABLE));
 379
 380   g_object_class_install_property (gobject_class,
 381                                    PROP_MIN_CONTENT_WIDTH,
 382                                    g_param_spec_int ("min-content-width",
 383                                                      P_("Minimum Content Width"),
 384                                                      P_("The minimum width that the scrolled window will allocate to its content"),
 385                                                      -1, G_MAXINT, -1,
 386                                                      GTK_PARAM_READWRITE));
 387   g_object_class_install_property (gobject_class,
 388                                    PROP_MIN_CONTENT_HEIGHT,
 389                                    g_param_spec_int ("min-content-height",
 390                                                      P_("Minimum Content Height"),
 391                                                      P_("The minimum height that the scrolled window will allocate to its content"),
 392                                                      -1, G_MAXINT, -1,
 393                                                      GTK_PARAM_READWRITE));
 394   /**
 395    * GtkScrolledWindow::scroll-child:
 396    * @scrolled_window: a #GtkScrolledWindow
 397    * @scroll: a #GtkScrollType describing how much to scroll
 398    * @horizontal: whether the keybinding scrolls the child
 399    *   horizontally or not
 400    *
 401    * The ::scroll-child signal is a
 402    * <link linkend="keybinding-signals">keybinding signal</link>
 403    * which gets emitted when a keybinding that scrolls is pressed.
 404    * The horizontal or vertical adjustment is updated which triggers a
 405    * signal that the scrolled windows child may listen to and scroll itself.
 406    */
 407   signals[SCROLL_CHILD] =
 408     g_signal_new (I_("scroll-child"),
 409                   G_TYPE_FROM_CLASS (gobject_class),
 410                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 411                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 412                   NULL, NULL,
 413                   _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
 414                   G_TYPE_BOOLEAN, 2,
 415                   GTK_TYPE_SCROLL_TYPE,
 416                   G_TYPE_BOOLEAN);
 417
 418   /**
 419    * GtkScrolledWindow::move-focus-out:
 420    * @scrolled_window: a #GtkScrolledWindow
 421    * @direction_type: either %GTK_DIR_TAB_FORWARD or
 422    *   %GTK_DIR_TAB_BACKWARD
 423    *
 424    * The ::move-focus-out signal is a
 425    * <link linkend="keybinding-signals">keybinding signal</link>
 426    * which gets emitted when focus is moved away from the scrolled
 427    * window by a keybinding.
 428    * The #GtkWidget::move-focus signal is emitted with @direction_type
 429    * on this scrolled windows toplevel parent in the container hierarchy.
 430    * The default bindings for this signal are
 431    * <keycombo><keycap>Tab</keycap><keycap>Ctrl</keycap></keycombo>
 432    * and
 433    * <keycombo><keycap>Tab</keycap><keycap>Ctrl</keycap><keycap>Shift</keycap></keycombo>.
 434    */
 435   signals[MOVE_FOCUS_OUT] =
 436     g_signal_new (I_("move-focus-out"),
 437                   G_TYPE_FROM_CLASS (gobject_class),
 438                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 439                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 440                   NULL, NULL,
 441                   _gtk_marshal_VOID__ENUM,
 442                   G_TYPE_NONE, 1,
 443                   GTK_TYPE_DIRECTION_TYPE);
 444
 445   binding_set = gtk_binding_set_by_class (class);
 446
 447   add_scroll_binding (binding_set, GDK_KEY_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 448   add_scroll_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 449   add_scroll_binding (binding_set, GDK_KEY_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 450   add_scroll_binding (binding_set, GDK_KEY_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 451
 452   add_scroll_binding (binding_set, GDK_KEY_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 453   add_scroll_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 454   add_scroll_binding (binding_set, GDK_KEY_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 455   add_scroll_binding (binding_set, GDK_KEY_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 456
 457   add_scroll_binding (binding_set, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 458   add_scroll_binding (binding_set, GDK_KEY_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 459   add_scroll_binding (binding_set, GDK_KEY_Home, 0,                GTK_SCROLL_START, FALSE);
 460   add_scroll_binding (binding_set, GDK_KEY_End,  0,                GTK_SCROLL_END,   FALSE);
 461
 462   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 463   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 464
 465   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 466 }
 467
 468 static void
 469 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 470 {
 471   GtkScrolledWindowPrivate *priv;
 472
 473   scrolled_window->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (scrolled_window,
 474                                                               GTK_TYPE_SCROLLED_WINDOW,
 475                                                               GtkScrolledWindowPrivate);
 476
 477   gtk_widget_set_has_window (GTK_WIDGET (scrolled_window), FALSE);
 478   gtk_widget_set_can_focus (GTK_WIDGET (scrolled_window), TRUE);
 479
 480   priv->hscrollbar = NULL;
 481   priv->vscrollbar = NULL;
 482   priv->hscrollbar_policy = GTK_POLICY_AUTOMATIC;
 483   priv->vscrollbar_policy = GTK_POLICY_AUTOMATIC;
 484   priv->hscrollbar_visible = FALSE;
 485   priv->vscrollbar_visible = FALSE;
 486   priv->focus_out = FALSE;
 487   priv->window_placement = GTK_CORNER_TOP_LEFT;
 488   gtk_scrolled_window_update_real_placement (scrolled_window);
 489   priv->min_content_width = -1;
 490   priv->min_content_height = -1;
 491 }
 492
 493 /**
 494  * gtk_scrolled_window_new:
 495  * @hadjustment: (allow-none): horizontal adjustment
 496  * @vadjustment: (allow-none): vertical adjustment
 497  *
 498  * Creates a new scrolled window.
 499  *
 500  * The two arguments are the scrolled window's adjustments; these will be
 501  * shared with the scrollbars and the child widget to keep the bars in sync
 502  * with the child. Usually you want to pass %NULL for the adjustments, which
 503  * will cause the scrolled window to create them for you.
 504  *
 505  * Returns: a new scrolled window
 506  */
 507 GtkWidget*
 508 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 509                          GtkAdjustment *vadjustment)
 510 {
 511   GtkWidget *scrolled_window;
 512
 513   if (hadjustment)
 514     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 515
 516   if (vadjustment)
 517     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 518
 519   scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
 520                                     "hadjustment", hadjustment,
 521                                     "vadjustment", vadjustment,
 522                                     NULL);
 523
 524   return scrolled_window;
 525 }
 526
 527 /**
 528  * gtk_scrolled_window_set_hadjustment:
 529  * @scrolled_window: a #GtkScrolledWindow
 530  * @hadjustment: horizontal scroll adjustment
 531  *
 532  * Sets the #GtkAdjustment for the horizontal scrollbar.
 533  */
 534 void
 535 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 536                                      GtkAdjustment     *hadjustment)
 537 {
 538   GtkScrolledWindowPrivate *priv;
 539   GtkBin *bin;
 540   GtkWidget *child;
 541
 542   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 543   if (hadjustment)
 544     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 545   else
 546     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 547
 548   bin = GTK_BIN (scrolled_window);
 549   priv = scrolled_window->priv;
 550
 551   if (!priv->hscrollbar)
 552     {
 553       gtk_widget_push_composite_child ();
 554       priv->hscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, hadjustment);
 555       gtk_widget_set_composite_name (priv->hscrollbar, "hscrollbar");
 556       gtk_widget_pop_composite_child ();
 557
 558       gtk_widget_set_parent (priv->hscrollbar, GTK_WIDGET (scrolled_window));
 559       g_object_ref (priv->hscrollbar);
 560       gtk_widget_show (priv->hscrollbar);
 561     }
 562   else
 563     {
 564       GtkAdjustment *old_adjustment;
 565
 566       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
 567       if (old_adjustment == hadjustment)
 568         return;
 569
 570       g_signal_handlers_disconnect_by_func (old_adjustment,
 571                                             gtk_scrolled_window_adjustment_changed,
 572                                             scrolled_window);
 573       gtk_range_set_adjustment (GTK_RANGE (priv->hscrollbar),
 574                                 hadjustment);
 575     }
 576   hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
 577   g_signal_connect (hadjustment,
 578                     "changed",
 579                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 580                     scrolled_window);
 581   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 582
 583   child = gtk_bin_get_child (bin);
 584   if (GTK_IS_SCROLLABLE (child))
 585     gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (child), hadjustment);
 586
 587   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 588 }
 589
 590 /**
 591  * gtk_scrolled_window_set_vadjustment:
 592  * @scrolled_window: a #GtkScrolledWindow
 593  * @vadjustment: vertical scroll adjustment
 594  *
 595  * Sets the #GtkAdjustment for the vertical scrollbar.
 596  */
 597 void
 598 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 599                                      GtkAdjustment     *vadjustment)
 600 {
 601   GtkScrolledWindowPrivate *priv;
 602   GtkBin *bin;
 603   GtkWidget *child;
 604
 605   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 606   if (vadjustment)
 607     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 608   else
 609     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 610
 611   bin = GTK_BIN (scrolled_window);
 612   priv = scrolled_window->priv;
 613
 614   if (!priv->vscrollbar)
 615     {
 616       gtk_widget_push_composite_child ();
 617       priv->vscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, vadjustment);
 618       gtk_widget_set_composite_name (priv->vscrollbar, "vscrollbar");
 619       gtk_widget_pop_composite_child ();
 620
 621       gtk_widget_set_parent (priv->vscrollbar, GTK_WIDGET (scrolled_window));
 622       g_object_ref (priv->vscrollbar);
 623       gtk_widget_show (priv->vscrollbar);
 624     }
 625   else
 626     {
 627       GtkAdjustment *old_adjustment;
 628
 629       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
 630       if (old_adjustment == vadjustment)
 631         return;
 632
 633       g_signal_handlers_disconnect_by_func (old_adjustment,
 634                                             gtk_scrolled_window_adjustment_changed,
 635                                             scrolled_window);
 636       gtk_range_set_adjustment (GTK_RANGE (priv->vscrollbar),
 637                                 vadjustment);
 638     }
 639   vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
 640   g_signal_connect (vadjustment,
 641                     "changed",
 642                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 643                     scrolled_window);
 644   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 645
 646   child = gtk_bin_get_child (bin);
 647   if (GTK_IS_SCROLLABLE (child))
 648     gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (child), vadjustment);
 649
 650   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 651 }
 652
 653 /**
 654  * gtk_scrolled_window_get_hadjustment:
 655  * @scrolled_window: a #GtkScrolledWindow
 656  *
 657  * Returns the horizontal scrollbar's adjustment, used to connect the
 658  * horizontal scrollbar to the child widget's horizontal scroll
 659  * functionality.
 660  *
 661  * Returns: (transfer none): the horizontal #GtkAdjustment
 662  */
 663 GtkAdjustment*
 664 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 665 {
 666   GtkScrolledWindowPrivate *priv;
 667
 668   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 669
 670   priv = scrolled_window->priv;
 671
 672   return (priv->hscrollbar ?
 673           gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)) :
 674           NULL);
 675 }
 676
 677 /**
 678  * gtk_scrolled_window_get_vadjustment:
 679  * @scrolled_window: a #GtkScrolledWindow
 680  *
 681  * Returns the vertical scrollbar's adjustment, used to connect the
 682  * vertical scrollbar to the child widget's vertical scroll functionality.
 683  *
 684  * Returns: (transfer none): the vertical #GtkAdjustment
 685  */
 686 GtkAdjustment*
 687 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 688 {
 689   GtkScrolledWindowPrivate *priv;
 690
 691   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 692
 693   priv = scrolled_window->priv;
 694
 695   return (priv->vscrollbar ?
 696           gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)) :
 697           NULL);
 698 }
 699
 700 /**
 701  * gtk_scrolled_window_get_hscrollbar:
 702  * @scrolled_window: a #GtkScrolledWindow
 703  *
 704  * Returns the horizontal scrollbar of @scrolled_window.
 705  *
 706  * Returns: (transfer none): the horizontal scrollbar of the scrolled window,
 707  *     or %NULL if it does not have one.
 708  *
 709  * Since: 2.8
 710  */
 711 GtkWidget*
 712 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 713 {
 714   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 715
 716   return scrolled_window->priv->hscrollbar;
 717 }
 718
 719 /**
 720  * gtk_scrolled_window_get_vscrollbar:
 721  * @scrolled_window: a #GtkScrolledWindow
 722  *
 723  * Returns the vertical scrollbar of @scrolled_window.
 724  *
 725  * Returns: (transfer none): the vertical scrollbar of the scrolled window,
 726  *     or %NULL if it does not have one.
 727  *
 728  * Since: 2.8
 729  */
 730 GtkWidget*
 731 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 732 {
 733   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 734
 735   return scrolled_window->priv->vscrollbar;
 736 }
 737
 738 /**
 739  * gtk_scrolled_window_set_policy:
 740  * @scrolled_window: a #GtkScrolledWindow
 741  * @hscrollbar_policy: policy for horizontal bar
 742  * @vscrollbar_policy: policy for vertical bar
 743  *
 744  * Sets the scrollbar policy for the horizontal and vertical scrollbars.
 745  *
 746  * The policy determines when the scrollbar should appear; it is a value
 747  * from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
 748  * scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
 749  * never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
 750  * if needed (that is, if the slider part of the bar would be smaller
 751  * than the trough - the display is larger than the page size).
 752  */
 753 void
 754 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 755                                 GtkPolicyType      hscrollbar_policy,
 756                                 GtkPolicyType      vscrollbar_policy)
 757 {
 758   GtkScrolledWindowPrivate *priv;
 759   GObject *object = G_OBJECT (scrolled_window);
 760
 761   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 762
 763   priv = scrolled_window->priv;
 764
 765   if ((priv->hscrollbar_policy != hscrollbar_policy) ||
 766       (priv->vscrollbar_policy != vscrollbar_policy))
 767     {
 768       priv->hscrollbar_policy = hscrollbar_policy;
 769       priv->vscrollbar_policy = vscrollbar_policy;
 770
 771       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 772
 773       g_object_freeze_notify (object);
 774       g_object_notify (object, "hscrollbar-policy");
 775       g_object_notify (object, "vscrollbar-policy");
 776       g_object_thaw_notify (object);
 777     }
 778 }
 779
 780 /**
 781  * gtk_scrolled_window_get_policy:
 782  * @scrolled_window: a #GtkScrolledWindow
 783  * @hscrollbar_policy: location to store the policy for the horizontal
 784  *     scrollbar, or %NULL.
 785  * @vscrollbar_policy: location to store the policy for the vertical
 786  *     scrollbar, or %NULL.
 787  *
 788  * Retrieves the current policy values for the horizontal and vertical
 789  * scrollbars. See gtk_scrolled_window_set_policy().
 790  */
 791 void
 792 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 793                                 GtkPolicyType     *hscrollbar_policy,
 794                                 GtkPolicyType     *vscrollbar_policy)
 795 {
 796   GtkScrolledWindowPrivate *priv;
 797
 798   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 799
 800   priv = scrolled_window->priv;
 801
 802   if (hscrollbar_policy)
 803     *hscrollbar_policy = priv->hscrollbar_policy;
 804   if (vscrollbar_policy)
 805     *vscrollbar_policy = priv->vscrollbar_policy;
 806 }
 807
 808 static void
 809 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 810 {
 811   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 812   GtkSettings *settings;
 813
 814   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 815
 816   if (priv->window_placement_set || settings == NULL)
 817     priv->real_window_placement = priv->window_placement;
 818   else
 819     g_object_get (settings,
 820                   "gtk-scrolled-window-placement",
 821                   &priv->real_window_placement,
 822                   NULL);
 823 }
 824
 825 static void
 826 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 827                                             GtkCornerType      window_placement)
 828 {
 829   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 830
 831   if (priv->window_placement != window_placement)
 832     {
 833       priv->window_placement = window_placement;
 834
 835       gtk_scrolled_window_update_real_placement (scrolled_window);
 836       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 837
 838       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 839     }
 840 }
 841
 842 static void
 843 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 844                                        gboolean           placement_set,
 845                                        gboolean           emit_resize)
 846 {
 847   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 848
 849   if (priv->window_placement_set != placement_set)
 850     {
 851       priv->window_placement_set = placement_set;
 852
 853       gtk_scrolled_window_update_real_placement (scrolled_window);
 854       if (emit_resize)
 855         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 856
 857       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 858     }
 859 }
 860
 861 /**
 862  * gtk_scrolled_window_set_placement:
 863  * @scrolled_window: a #GtkScrolledWindow
 864  * @window_placement: position of the child window
 865  *
 866  * Sets the placement of the contents with respect to the scrollbars
 867  * for the scrolled window.
 868  *
 869  * The default is %GTK_CORNER_TOP_LEFT, meaning the child is
 870  * in the top left, with the scrollbars underneath and to the right.
 871  * Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
 872  * %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
 873  *
 874  * See also gtk_scrolled_window_get_placement() and
 875  * gtk_scrolled_window_unset_placement().
 876  */
 877 void
 878 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 879                                    GtkCornerType      window_placement)
 880 {
 881   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 882
 883   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 884   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 885 }
 886
 887 /**
 888  * gtk_scrolled_window_get_placement:
 889  * @scrolled_window: a #GtkScrolledWindow
 890  *
 891  * Gets the placement of the contents with respect to the scrollbars
 892  * for the scrolled window. See gtk_scrolled_window_set_placement().
 893  *
 894  * Return value: the current placement value.
 895  *
 896  * See also gtk_scrolled_window_set_placement() and
 897  * gtk_scrolled_window_unset_placement().
 898  **/
 899 GtkCornerType
 900 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 901 {
 902   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 903
 904   return scrolled_window->priv->window_placement;
 905 }
 906
 907 /**
 908  * gtk_scrolled_window_unset_placement:
 909  * @scrolled_window: a #GtkScrolledWindow
 910  *
 911  * Unsets the placement of the contents with respect to the scrollbars
 912  * for the scrolled window. If no window placement is set for a scrolled
 913  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 914  *
 915  * See also gtk_scrolled_window_set_placement() and
 916  * gtk_scrolled_window_get_placement().
 917  *
 918  * Since: 2.10
 919  **/
 920 void
 921 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 922 {
 923   GtkScrolledWindowPrivate *priv;
 924
 925   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 926
 927   priv = scrolled_window->priv;
 928
 929   if (priv->window_placement_set)
 930     {
 931       priv->window_placement_set = FALSE;
 932
 933       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 934
 935       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 936     }
 937 }
 938
 939 /**
 940  * gtk_scrolled_window_set_shadow_type:
 941  * @scrolled_window: a #GtkScrolledWindow
 942  * @type: kind of shadow to draw around scrolled window contents
 943  *
 944  * Changes the type of shadow drawn around the contents of
 945  * @scrolled_window.
 946  *
 947  **/
 948 void
 949 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 950                                      GtkShadowType      type)
 951 {
 952   GtkScrolledWindowPrivate *priv;
 953
 954   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 955   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 956
 957   priv = scrolled_window->priv;
 958
 959   if (priv->shadow_type != type)
 960     {
 961       priv->shadow_type = type;
 962
 963       if (gtk_widget_is_drawable (GTK_WIDGET (scrolled_window)))
 964         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 965
 966       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 967
 968       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 969     }
 970 }
 971
 972 /**
 973  * gtk_scrolled_window_get_shadow_type:
 974  * @scrolled_window: a #GtkScrolledWindow
 975  *
 976  * Gets the shadow type of the scrolled window. See
 977  * gtk_scrolled_window_set_shadow_type().
 978  *
 979  * Return value: the current shadow type
 980  **/
 981 GtkShadowType
 982 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 983 {
 984   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 985
 986   return scrolled_window->priv->shadow_type;
 987 }
 988
 989 static void
 990 gtk_scrolled_window_destroy (GtkWidget *widget)
 991 {
 992   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
 993   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 994
 995   if (priv->hscrollbar)
 996     {
 997       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
 998                                             gtk_scrolled_window_adjustment_changed,
 999                                             scrolled_window);
1000       gtk_widget_unparent (priv->hscrollbar);
1001       gtk_widget_destroy (priv->hscrollbar);
1002       g_object_unref (priv->hscrollbar);
1003       priv->hscrollbar = NULL;
1004     }
1005   if (priv->vscrollbar)
1006     {
1007       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)),
1008                                             gtk_scrolled_window_adjustment_changed,
1009                                             scrolled_window);
1010       gtk_widget_unparent (priv->vscrollbar);
1011       gtk_widget_destroy (priv->vscrollbar);
1012       g_object_unref (priv->vscrollbar);
1013       priv->vscrollbar = NULL;
1014     }
1015
1016   GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->destroy (widget);
1017 }
1018
1019 static void
1020 gtk_scrolled_window_set_property (GObject      *object,
1021                                   guint         prop_id,
1022                                   const GValue *value,
1023                                   GParamSpec   *pspec)
1024 {
1025   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
1026   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1027
1028   switch (prop_id)
1029     {
1030     case PROP_HADJUSTMENT:
1031       gtk_scrolled_window_set_hadjustment (scrolled_window,
1032                                            g_value_get_object (value));
1033       break;
1034     case PROP_VADJUSTMENT:
1035       gtk_scrolled_window_set_vadjustment (scrolled_window,
1036                                            g_value_get_object (value));
1037       break;
1038     case PROP_HSCROLLBAR_POLICY:
1039       gtk_scrolled_window_set_policy (scrolled_window,
1040                                       g_value_get_enum (value),
1041                                       priv->vscrollbar_policy);
1042       break;
1043     case PROP_VSCROLLBAR_POLICY:
1044       gtk_scrolled_window_set_policy (scrolled_window,
1045                                       priv->hscrollbar_policy,
1046                                       g_value_get_enum (value));
1047       break;
1048     case PROP_WINDOW_PLACEMENT:
1049       gtk_scrolled_window_set_placement_internal (scrolled_window,
1050                                                   g_value_get_enum (value));
1051       break;
1052     case PROP_WINDOW_PLACEMENT_SET:
1053       gtk_scrolled_window_set_placement_set (scrolled_window,
1054                                              g_value_get_boolean (value),
1055                                              TRUE);
1056       break;
1057     case PROP_SHADOW_TYPE:
1058       gtk_scrolled_window_set_shadow_type (scrolled_window,
1059                                            g_value_get_enum (value));
1060       break;
1061     case PROP_MIN_CONTENT_WIDTH:
1062       gtk_scrolled_window_set_min_content_width (scrolled_window,
1063                                                  g_value_get_int (value));
1064       break;
1065     case PROP_MIN_CONTENT_HEIGHT:
1066       gtk_scrolled_window_set_min_content_height (scrolled_window,
1067                                                   g_value_get_int (value));
1068       break;
1069     default:
1070       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1071       break;
1072     }
1073 }
1074
1075 static void
1076 gtk_scrolled_window_get_property (GObject    *object,
1077                                   guint       prop_id,
1078                                   GValue     *value,
1079                                   GParamSpec *pspec)
1080 {
1081   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
1082   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1083
1084   switch (prop_id)
1085     {
1086     case PROP_HADJUSTMENT:
1087       g_value_set_object (value,
1088                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
1089       break;
1090     case PROP_VADJUSTMENT:
1091       g_value_set_object (value,
1092                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
1093       break;
1094     case PROP_WINDOW_PLACEMENT:
1095       g_value_set_enum (value, priv->window_placement);
1096       break;
1097     case PROP_WINDOW_PLACEMENT_SET:
1098       g_value_set_boolean (value, priv->window_placement_set);
1099       break;
1100     case PROP_SHADOW_TYPE:
1101       g_value_set_enum (value, priv->shadow_type);
1102       break;
1103     case PROP_HSCROLLBAR_POLICY:
1104       g_value_set_enum (value, priv->hscrollbar_policy);
1105       break;
1106     case PROP_VSCROLLBAR_POLICY:
1107       g_value_set_enum (value, priv->vscrollbar_policy);
1108       break;
1109     case PROP_MIN_CONTENT_WIDTH:
1110       g_value_set_int (value, priv->min_content_width);
1111       break;
1112     case PROP_MIN_CONTENT_HEIGHT:
1113       g_value_set_int (value, priv->min_content_height);
1114       break;
1115     default:
1116       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1117       break;
1118     }
1119 }
1120
1121 static void
1122 traverse_container (GtkWidget *widget,
1123                     gpointer   data)
1124 {
1125   if (GTK_IS_SCROLLED_WINDOW (widget))
1126     {
1127       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1128       gtk_widget_queue_resize (widget);
1129     }
1130   else if (GTK_IS_CONTAINER (widget))
1131     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
1132 }
1133
1134 static void
1135 gtk_scrolled_window_settings_changed (GtkSettings *settings)
1136 {
1137   GList *list, *l;
1138
1139   list = gtk_window_list_toplevels ();
1140
1141   for (l = list; l; l = l->next)
1142     gtk_container_forall (GTK_CONTAINER (l->data),
1143                           traverse_container, NULL);
1144
1145   g_list_free (list);
1146 }
1147
1148 static void
1149 gtk_scrolled_window_screen_changed (GtkWidget *widget,
1150                                     GdkScreen *previous_screen)
1151 {
1152   GtkSettings *settings;
1153   guint window_placement_connection;
1154
1155   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1156
1157   if (!gtk_widget_has_screen (widget))
1158     return;
1159
1160   settings = gtk_widget_get_settings (widget);
1161
1162   window_placement_connection =
1163     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
1164                                          "gtk-scrolled-window-connection"));
1165
1166   if (window_placement_connection)
1167     return;
1168
1169   window_placement_connection =
1170     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
1171                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
1172   g_object_set_data (G_OBJECT (settings),
1173                      I_("gtk-scrolled-window-connection"),
1174                      GUINT_TO_POINTER (window_placement_connection));
1175 }
1176
1177 static gboolean
1178 gtk_scrolled_window_draw (GtkWidget *widget,
1179                           cairo_t   *cr)
1180 {
1181   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1182   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1183
1184   if (priv->shadow_type != GTK_SHADOW_NONE)
1185     {
1186       GtkAllocation relative_allocation;
1187       GtkStyle *style;
1188       gboolean scrollbars_within_bevel;
1189
1190       style = gtk_widget_get_style (widget);
1191       gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1192
1193       if (!scrollbars_within_bevel)
1194         {
1195           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1196
1197           relative_allocation.x -= style->xthickness;
1198           relative_allocation.y -= style->ythickness;
1199           relative_allocation.width += 2 * style->xthickness;
1200           relative_allocation.height += 2 * style->ythickness;
1201         }
1202       else
1203         {
1204           relative_allocation.x = 0;
1205           relative_allocation.y = 0;
1206           relative_allocation.width = gtk_widget_get_allocated_width (widget);
1207           relative_allocation.height = gtk_widget_get_allocated_height (widget);
1208         }
1209
1210       gtk_paint_shadow (style,
1211                         cr,
1212                         GTK_STATE_NORMAL, priv->shadow_type,
1213                         widget, "scrolled_window",
1214                         relative_allocation.x,
1215                         relative_allocation.y,
1216                         relative_allocation.width,
1217                         relative_allocation.height);
1218     }
1219
1220   GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->draw (widget, cr);
1221
1222   return FALSE;
1223 }
1224
1225 static void
1226 gtk_scrolled_window_forall (GtkContainer *container,
1227                             gboolean      include_internals,
1228                             GtkCallback   callback,
1229                             gpointer      callback_data)
1230 {
1231   GtkScrolledWindowPrivate *priv;
1232   GtkScrolledWindow *scrolled_window;
1233
1234   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1235   g_return_if_fail (callback != NULL);
1236
1237   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
1238                                               include_internals,
1239                                               callback,
1240                                               callback_data);
1241   if (include_internals)
1242     {
1243       scrolled_window = GTK_SCROLLED_WINDOW (container);
1244       priv = scrolled_window->priv;
1245
1246       if (priv->vscrollbar)
1247         callback (priv->vscrollbar, callback_data);
1248       if (priv->hscrollbar)
1249         callback (priv->hscrollbar, callback_data);
1250     }
1251 }
1252
1253 static gboolean
1254 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1255                                   GtkScrollType      scroll,
1256                                   gboolean           horizontal)
1257 {
1258   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1259   GtkAdjustment *adjustment = NULL;
1260
1261   switch (scroll)
1262     {
1263     case GTK_SCROLL_STEP_UP:
1264       scroll = GTK_SCROLL_STEP_BACKWARD;
1265       horizontal = FALSE;
1266       break;
1267     case GTK_SCROLL_STEP_DOWN:
1268       scroll = GTK_SCROLL_STEP_FORWARD;
1269       horizontal = FALSE;
1270       break;
1271     case GTK_SCROLL_STEP_LEFT:
1272       scroll = GTK_SCROLL_STEP_BACKWARD;
1273       horizontal = TRUE;
1274       break;
1275     case GTK_SCROLL_STEP_RIGHT:
1276       scroll = GTK_SCROLL_STEP_FORWARD;
1277       horizontal = TRUE;
1278       break;
1279     case GTK_SCROLL_PAGE_UP:
1280       scroll = GTK_SCROLL_PAGE_BACKWARD;
1281       horizontal = FALSE;
1282       break;
1283     case GTK_SCROLL_PAGE_DOWN:
1284       scroll = GTK_SCROLL_PAGE_FORWARD;
1285       horizontal = FALSE;
1286       break;
1287     case GTK_SCROLL_PAGE_LEFT:
1288       scroll = GTK_SCROLL_STEP_BACKWARD;
1289       horizontal = TRUE;
1290       break;
1291     case GTK_SCROLL_PAGE_RIGHT:
1292       scroll = GTK_SCROLL_STEP_FORWARD;
1293       horizontal = TRUE;
1294       break;
1295     case GTK_SCROLL_STEP_BACKWARD:
1296     case GTK_SCROLL_STEP_FORWARD:
1297     case GTK_SCROLL_PAGE_BACKWARD:
1298     case GTK_SCROLL_PAGE_FORWARD:
1299     case GTK_SCROLL_START:
1300     case GTK_SCROLL_END:
1301       break;
1302     default:
1303       g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
1304       return FALSE;
1305     }
1306
1307   if ((horizontal && (!priv->hscrollbar || !priv->hscrollbar_visible)) ||
1308       (!horizontal && (!priv->vscrollbar || !priv->vscrollbar_visible)))
1309     return FALSE;
1310
1311   if (horizontal)
1312     {
1313       if (priv->hscrollbar)
1314         adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
1315     }
1316   else
1317     {
1318       if (priv->vscrollbar)
1319         adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
1320     }
1321
1322   if (adjustment)
1323     {
1324       gdouble value = adjustment->value;
1325
1326       switch (scroll)
1327         {
1328         case GTK_SCROLL_STEP_FORWARD:
1329           value += adjustment->step_increment;
1330           break;
1331         case GTK_SCROLL_STEP_BACKWARD:
1332           value -= adjustment->step_increment;
1333           break;
1334         case GTK_SCROLL_PAGE_FORWARD:
1335           value += adjustment->page_increment;
1336           break;
1337         case GTK_SCROLL_PAGE_BACKWARD:
1338           value -= adjustment->page_increment;
1339           break;
1340         case GTK_SCROLL_START:
1341           value = adjustment->lower;
1342           break;
1343         case GTK_SCROLL_END:
1344           value = adjustment->upper;
1345           break;
1346         default:
1347           g_assert_not_reached ();
1348           break;
1349         }
1350
1351       gtk_adjustment_set_value (adjustment, value);
1352
1353       return TRUE;
1354     }
1355
1356   return FALSE;
1357 }
1358
1359 static void
1360 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1361                                     GtkDirectionType   direction_type)
1362 {
1363   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1364   GtkWidget *toplevel;
1365
1366   /* Focus out of the scrolled window entirely. We do this by setting
1367    * a flag, then propagating the focus motion to the notebook.
1368    */
1369   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1370   if (!gtk_widget_is_toplevel (toplevel))
1371     return;
1372
1373   g_object_ref (scrolled_window);
1374
1375   priv->focus_out = TRUE;
1376   g_signal_emit_by_name (toplevel, "move-focus", direction_type);
1377   priv->focus_out = FALSE;
1378
1379   g_object_unref (scrolled_window);
1380 }
1381
1382 static void
1383 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1384                                          GtkAllocation *allocation)
1385 {
1386   GtkAllocation widget_allocation;
1387   GtkScrolledWindow *scrolled_window;
1388   GtkScrolledWindowPrivate *priv;
1389   GtkStyle *style;
1390   gint sb_spacing;
1391   gint sb_width;
1392   gint sb_height;
1393
1394   g_return_if_fail (widget != NULL);
1395   g_return_if_fail (allocation != NULL);
1396
1397   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1398   priv = scrolled_window->priv;
1399
1400   /* Get possible scrollbar dimensions */
1401   sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1402   gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL);
1403   gtk_widget_get_preferred_width (priv->vscrollbar, &sb_width, NULL);
1404
1405   /* Subtract some things from our available allocation size */
1406   allocation->x = 0;
1407   allocation->y = 0;
1408
1409   if (priv->shadow_type != GTK_SHADOW_NONE)
1410     {
1411       style = gtk_widget_get_style (widget);
1412       allocation->x += style->xthickness;
1413       allocation->y += style->ythickness;
1414     }
1415
1416   gtk_widget_get_allocation (widget, &widget_allocation);
1417   allocation->width = MAX (1, (gint) widget_allocation.width - allocation->x * 2);
1418   allocation->height = MAX (1, (gint) widget_allocation.height - allocation->y * 2);
1419
1420   if (priv->vscrollbar_visible)
1421     {
1422       gboolean is_rtl;
1423
1424       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1425
1426       if ((!is_rtl &&
1427            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1428             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1429           (is_rtl &&
1430            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1431             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1432         allocation->x += (sb_width +  sb_spacing);
1433
1434       allocation->width = MAX (1, allocation->width - (sb_width + sb_spacing));
1435     }
1436   if (priv->hscrollbar_visible)
1437     {
1438
1439       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1440           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1441         allocation->y += (sb_height + sb_spacing);
1442
1443       allocation->height = MAX (1, allocation->height - (sb_height + sb_spacing));
1444     }
1445 }
1446
1447 static void
1448 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1449                                    GtkAllocation *allocation)
1450 {
1451   GtkScrolledWindow *scrolled_window;
1452   GtkScrolledWindowPrivate *priv;
1453   GtkStyle *style;
1454   GtkBin *bin;
1455   GtkAllocation relative_allocation;
1456   GtkAllocation child_allocation;
1457   GtkWidget *child;
1458   gboolean scrollbars_within_bevel;
1459   gint sb_spacing;
1460   gint sb_width;
1461   gint sb_height;
1462
1463   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1464   g_return_if_fail (allocation != NULL);
1465
1466   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1467   bin = GTK_BIN (scrolled_window);
1468   priv = scrolled_window->priv;
1469
1470   /* Get possible scrollbar dimensions */
1471   sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1472   gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL);
1473   gtk_widget_get_preferred_width (priv->vscrollbar, &sb_width, NULL);
1474
1475   style = gtk_widget_get_style (widget);
1476   gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1477
1478   gtk_widget_set_allocation (widget, allocation);
1479
1480   if (priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
1481     priv->hscrollbar_visible = TRUE;
1482   else if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
1483     priv->hscrollbar_visible = FALSE;
1484   if (priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
1485     priv->vscrollbar_visible = TRUE;
1486   else if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
1487     priv->vscrollbar_visible = FALSE;
1488
1489   child = gtk_bin_get_child (bin);
1490   if (child && gtk_widget_get_visible (child))
1491     {
1492       gint child_scroll_width;
1493       gint child_scroll_height;
1494       gboolean previous_hvis;
1495       gboolean previous_vvis;
1496       guint count = 0;
1497
1498       /* In the case that both scrollbars are visible in the previous round,
1499        * we dont do our guess-work before hand because it's possible some
1500        * infinite recursion was detected (leave it up to the child scrollable
1501        * widget in this case to drive the scrollbar visibility completely
1502        * with the adjustment values).
1503        */
1504       if (!priv->vscrollbar_visible || !priv->hscrollbar_visible)
1505         {
1506
1507           /* Determine scrollbar visibility first via hfw apis */
1508           if (gtk_widget_get_request_mode (child) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
1509             {
1510               if (gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (child)) == GTK_SCROLL_MINIMUM)
1511                 gtk_widget_get_preferred_width (child, &child_scroll_width, NULL);
1512               else
1513                 gtk_widget_get_preferred_width (child, NULL, &child_scroll_width);
1514
1515               if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1516                 {
1517                   /* First try without a vertical scrollbar if the content will fit the height
1518                    * given the extra width of the scrollbar */
1519                   if (gtk_scrollable_get_vscroll_policy (GTK_SCROLLABLE (child)) == GTK_SCROLL_MINIMUM)
1520                     gtk_widget_get_preferred_height_for_width (child,
1521                                                                MAX (allocation->width, child_scroll_width),
1522                                                                &child_scroll_height, NULL);
1523                   else
1524                     gtk_widget_get_preferred_height_for_width (child,
1525                                                                MAX (allocation->width, child_scroll_width),
1526                                                                NULL, &child_scroll_height);
1527
1528                   if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1529                     {
1530                       /* Does the content height fit the allocation height ? */
1531                       priv->vscrollbar_visible = child_scroll_height > allocation->height;
1532
1533                       /* Does the content width fit the allocation with minus a possible scrollbar ? */
1534                       priv->hscrollbar_visible =
1535                         child_scroll_width > allocation->width -
1536                         (priv->vscrollbar_visible ? sb_width + sb_spacing : 0);
1537
1538                       /* Now that we've guessed the hscrollbar, does the content height fit
1539                        * the possible new allocation height ? */
1540                       priv->vscrollbar_visible =
1541                         child_scroll_height > allocation->height -
1542                         (priv->hscrollbar_visible ? sb_height + sb_spacing : 0);
1543
1544                       /* Now that we've guessed the vscrollbar, does the content width fit
1545                        * the possible new allocation width ? */
1546                       priv->hscrollbar_visible =
1547                         child_scroll_width > allocation->width -
1548                         (priv->vscrollbar_visible ? sb_width + sb_spacing : 0);
1549                     }
1550                   else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
1551                     {
1552                       priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
1553                       priv->vscrollbar_visible = child_scroll_height > allocation->height -
1554                         (priv->hscrollbar_visible ? sb_height + sb_spacing : 0);
1555                     }
1556                 }
1557               else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
1558                 {
1559                   priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
1560
1561                   if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1562                     priv->hscrollbar_visible =
1563                       child_scroll_width > allocation->width -
1564                       (priv->vscrollbar_visible ? 0 : sb_width + sb_spacing);
1565                   else
1566                     priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
1567                 }
1568             }
1569           else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT */
1570             {
1571               if (gtk_scrollable_get_vscroll_policy (GTK_SCROLLABLE (child)) == GTK_SCROLL_MINIMUM)
1572                 gtk_widget_get_preferred_height (child, &child_scroll_height, NULL);
1573               else
1574                 gtk_widget_get_preferred_height (child, NULL, &child_scroll_height);
1575
1576               if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1577                 {
1578                   /* First try without a horizontal scrollbar if the content will fit the width
1579                    * given the extra height of the scrollbar */
1580                   if (gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (child)) == GTK_SCROLL_MINIMUM)
1581                     gtk_widget_get_preferred_width_for_height (child,
1582                                                                MAX (allocation->height, child_scroll_height),
1583                                                                &child_scroll_width, NULL);
1584                   else
1585                     gtk_widget_get_preferred_width_for_height (child,
1586                                                                MAX (allocation->height, child_scroll_height),
1587                                                                NULL, &child_scroll_width);
1588
1589                   if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1590                     {
1591                       /* Does the content width fit the allocation width ? */
1592                       priv->hscrollbar_visible = child_scroll_width > allocation->width;
1593
1594                       /* Does the content height fit the allocation with minus a possible scrollbar ? */
1595                       priv->vscrollbar_visible =
1596                         child_scroll_height > allocation->height -
1597                         (priv->hscrollbar_visible ? sb_height + sb_spacing : 0);
1598
1599                       /* Now that we've guessed the vscrollbar, does the content width fit
1600                        * the possible new allocation width ? */
1601                       priv->hscrollbar_visible =
1602                         child_scroll_width > allocation->width -
1603                         (priv->vscrollbar_visible ? sb_width + sb_spacing : 0);
1604
1605                       /* Now that we've guessed the hscrollbar, does the content height fit
1606                        * the possible new allocation height ? */
1607                       priv->vscrollbar_visible =
1608                         child_scroll_height > allocation->height -
1609                         (priv->hscrollbar_visible ? sb_height + sb_spacing : 0);
1610                     }
1611                   else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
1612                     {
1613                       priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
1614                       priv->hscrollbar_visible = child_scroll_width > allocation->width -
1615                         (priv->vscrollbar_visible ? sb_width + sb_spacing : 0);
1616                     }
1617                 }
1618               else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
1619                 {
1620                   priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
1621
1622                   if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1623                     priv->vscrollbar_visible =
1624                       child_scroll_height > allocation->height -
1625                       (priv->hscrollbar_visible ? 0 : sb_height + sb_spacing);
1626                   else
1627                     priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
1628                 }
1629             }
1630         }
1631
1632       /* Now after guessing scrollbar visibility; fall back on the allocation loop which
1633        * observes the adjustments to detect scrollbar visibility and also avoids
1634        * infinite recursion
1635        */
1636       do
1637         {
1638           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1639
1640           child_allocation.x = relative_allocation.x + allocation->x;
1641           child_allocation.y = relative_allocation.y + allocation->y;
1642           child_allocation.width = relative_allocation.width;
1643           child_allocation.height = relative_allocation.height;
1644
1645           previous_hvis = priv->hscrollbar_visible;
1646           previous_vvis = priv->vscrollbar_visible;
1647
1648           gtk_widget_size_allocate (child, &child_allocation);
1649
1650           /* If, after the first iteration, the hscrollbar and the
1651            * vscrollbar flip visiblity, then we need both.
1652            */
1653           if (count &&
1654               previous_hvis != priv->hscrollbar_visible &&
1655               previous_vvis != priv->vscrollbar_visible)
1656             {
1657               priv->hscrollbar_visible = TRUE;
1658               priv->vscrollbar_visible = TRUE;
1659
1660               /* a new resize is already queued at this point,
1661                * so we will immediatedly get reinvoked
1662                */
1663               return;
1664             }
1665
1666           count++;
1667         }
1668       while (previous_hvis != priv->hscrollbar_visible ||
1669              previous_vvis != priv->vscrollbar_visible);
1670     }
1671   else
1672     {
1673       priv->hscrollbar_visible = priv->hscrollbar_policy == GTK_POLICY_ALWAYS;
1674       priv->vscrollbar_visible = priv->vscrollbar_policy == GTK_POLICY_ALWAYS;
1675       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1676     }
1677
1678   if (priv->hscrollbar_visible)
1679     {
1680       if (!gtk_widget_get_visible (priv->hscrollbar))
1681         gtk_widget_show (priv->hscrollbar);
1682
1683       child_allocation.x = relative_allocation.x;
1684       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1685           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1686         child_allocation.y = (relative_allocation.y +
1687                               relative_allocation.height +
1688                               sb_spacing +
1689                               (priv->shadow_type == GTK_SHADOW_NONE ?
1690                                0 : style->ythickness));
1691       else
1692         child_allocation.y = 0;
1693
1694       child_allocation.width = relative_allocation.width;
1695       child_allocation.height = sb_height;
1696       child_allocation.x += allocation->x;
1697       child_allocation.y += allocation->y;
1698
1699       if (priv->shadow_type != GTK_SHADOW_NONE)
1700         {
1701           if (!scrollbars_within_bevel)
1702             {
1703               child_allocation.x -= style->xthickness;
1704               child_allocation.width += 2 * style->xthickness;
1705             }
1706           else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
1707                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1708             {
1709               child_allocation.y -= style->ythickness;
1710             }
1711           else
1712             {
1713               child_allocation.y += style->ythickness;
1714             }
1715         }
1716
1717       gtk_widget_size_allocate (priv->hscrollbar, &child_allocation);
1718     }
1719   else if (gtk_widget_get_visible (priv->hscrollbar))
1720     gtk_widget_hide (priv->hscrollbar);
1721
1722   if (priv->vscrollbar_visible)
1723     {
1724       if (!gtk_widget_get_visible (priv->vscrollbar))
1725         gtk_widget_show (priv->vscrollbar);
1726
1727       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1728            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1729             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1730           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1731            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1732             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1733         child_allocation.x = (relative_allocation.x +
1734                               relative_allocation.width +
1735                               sb_spacing +
1736                               (priv->shadow_type == GTK_SHADOW_NONE ?
1737                                0 : style->xthickness));
1738       else
1739         child_allocation.x = 0;
1740
1741       child_allocation.y = relative_allocation.y;
1742       child_allocation.width = sb_width;
1743       child_allocation.height = relative_allocation.height;
1744       child_allocation.x += allocation->x;
1745       child_allocation.y += allocation->y;
1746
1747       if (priv->shadow_type != GTK_SHADOW_NONE)
1748         {
1749           if (!scrollbars_within_bevel)
1750             {
1751               child_allocation.y -= style->ythickness;
1752               child_allocation.height += 2 * style->ythickness;
1753             }
1754           else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
1755                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1756             {
1757               child_allocation.x -= style->xthickness;
1758             }
1759           else
1760             {
1761               child_allocation.x += style->xthickness;
1762             }
1763         }
1764
1765       gtk_widget_size_allocate (priv->vscrollbar, &child_allocation);
1766     }
1767   else if (gtk_widget_get_visible (priv->vscrollbar))
1768     gtk_widget_hide (priv->vscrollbar);
1769 }
1770
1771 static gboolean
1772 gtk_scrolled_window_scroll_event (GtkWidget      *widget,
1773                                   GdkEventScroll *event)
1774 {
1775   GtkScrolledWindowPrivate *priv;
1776   GtkScrolledWindow *scrolled_window;
1777   GtkWidget *range;
1778
1779   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1780   g_return_val_if_fail (event != NULL, FALSE);
1781
1782   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1783   priv = scrolled_window->priv;
1784
1785   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1786     range = priv->vscrollbar;
1787   else
1788     range = priv->hscrollbar;
1789
1790   if (range && gtk_widget_get_visible (range))
1791     {
1792       GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range));
1793       gdouble delta;
1794
1795       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1796
1797       gtk_adjustment_set_value (adj, adj->value + delta);
1798
1799       return TRUE;
1800     }
1801
1802   return FALSE;
1803 }
1804
1805 static gboolean
1806 gtk_scrolled_window_focus (GtkWidget        *widget,
1807                            GtkDirectionType  direction)
1808 {
1809   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1810   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1811   GtkWidget *child;
1812   gboolean had_focus_child;
1813
1814   had_focus_child = gtk_container_get_focus_child (GTK_CONTAINER (widget)) != NULL;
1815
1816   if (priv->focus_out)
1817     {
1818       priv->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1819       return FALSE;
1820     }
1821
1822   if (gtk_widget_is_focus (widget))
1823     return FALSE;
1824
1825   /* We only put the scrolled window itself in the focus chain if it
1826    * isn't possible to focus any children.
1827    */
1828   child = gtk_bin_get_child (GTK_BIN (widget));
1829   if (child)
1830     {
1831       if (gtk_widget_child_focus (child, direction))
1832         return TRUE;
1833     }
1834
1835   if (!had_focus_child && gtk_widget_get_can_focus (widget))
1836     {
1837       gtk_widget_grab_focus (widget);
1838       return TRUE;
1839     }
1840   else
1841     return FALSE;
1842 }
1843
1844 static void
1845 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1846                                         gpointer       data)
1847 {
1848   GtkScrolledWindowPrivate *priv;;
1849   GtkScrolledWindow *scrolled_window;
1850
1851   g_return_if_fail (adjustment != NULL);
1852   g_return_if_fail (data != NULL);
1853
1854   scrolled_window = GTK_SCROLLED_WINDOW (data);
1855   priv = scrolled_window->priv;
1856
1857   if (priv->hscrollbar &&
1858       adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
1859     {
1860       if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1861         {
1862           gboolean visible;
1863
1864           visible = priv->hscrollbar_visible;
1865           priv->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1866                                               adjustment->page_size);
1867           if (priv->hscrollbar_visible != visible)
1868             gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
1869         }
1870     }
1871   else if (priv->vscrollbar &&
1872            adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
1873     {
1874       if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1875         {
1876           gboolean visible;
1877
1878           visible = priv->vscrollbar_visible;
1879           priv->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1880                                               adjustment->page_size);
1881           if (priv->vscrollbar_visible != visible)
1882             gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
1883         }
1884     }
1885 }
1886
1887 static void
1888 gtk_scrolled_window_add (GtkContainer *container,
1889                          GtkWidget    *child)
1890 {
1891   GtkScrolledWindowPrivate *priv;
1892   GtkScrolledWindow *scrolled_window;
1893   GtkBin *bin;
1894   GtkWidget *child_widget;
1895   GtkAdjustment *hadj, *vadj;
1896
1897   bin = GTK_BIN (container);
1898   child_widget = gtk_bin_get_child (bin);
1899   g_return_if_fail (child_widget == NULL);
1900
1901   scrolled_window = GTK_SCROLLED_WINDOW (container);
1902   priv = scrolled_window->priv;
1903
1904   _gtk_bin_set_child (bin, child);
1905   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1906
1907   hadj = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->priv->hscrollbar));
1908   vadj = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->priv->vscrollbar));
1909
1910   if (GTK_IS_SCROLLABLE (child))
1911     g_object_set (child, "hadjustment", hadj, "vadjustment", vadj, NULL);
1912   else
1913     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1914                "use gtk_scrolled_window_add_with_viewport() instead");
1915 }
1916
1917 static void
1918 gtk_scrolled_window_remove (GtkContainer *container,
1919                             GtkWidget    *child)
1920 {
1921   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1922   g_return_if_fail (child != NULL);
1923   g_return_if_fail (gtk_bin_get_child (GTK_BIN (container)) == child);
1924
1925   g_object_set (child, "hadjustment", NULL, "vadjustment", NULL, NULL);
1926
1927   /* chain parent class handler to remove child */
1928   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1929 }
1930
1931 /**
1932  * gtk_scrolled_window_add_with_viewport:
1933  * @scrolled_window: a #GtkScrolledWindow
1934  * @child: the widget you want to scroll
1935  *
1936  * Used to add children without native scrolling capabilities. This
1937  * is simply a convenience function; it is equivalent to adding the
1938  * unscrollable child to a viewport, then adding the viewport to the
1939  * scrolled window. If a child has native scrolling, use
1940  * gtk_container_add() instead of this function.
1941  *
1942  * The viewport scrolls the child by moving its #GdkWindow, and takes
1943  * the size of the child to be the size of its toplevel #GdkWindow.
1944  * This will be very wrong for most widgets that support native scrolling;
1945  * for example, if you add a widget such as #GtkTreeView with a viewport,
1946  * the whole widget will scroll, including the column headings. Thus,
1947  * widgets with native scrolling support should not be used with the
1948  * #GtkViewport proxy.
1949  *
1950  * A widget supports scrolling natively if it implements the
1951  * #GtkScrollable interface.
1952  */
1953 void
1954 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1955                                        GtkWidget         *child)
1956 {
1957   GtkBin *bin;
1958   GtkWidget *viewport;
1959   GtkWidget *child_widget;
1960
1961   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1962   g_return_if_fail (GTK_IS_WIDGET (child));
1963   g_return_if_fail (gtk_widget_get_parent (child) == NULL);
1964
1965   bin = GTK_BIN (scrolled_window);
1966   child_widget = gtk_bin_get_child (bin);
1967
1968   if (child_widget)
1969     {
1970       g_return_if_fail (GTK_IS_VIEWPORT (child_widget));
1971       g_return_if_fail (gtk_bin_get_child (GTK_BIN (child_widget)) == NULL);
1972
1973       viewport = child_widget;
1974     }
1975   else
1976     {
1977       viewport =
1978         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1979                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1980       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1981     }
1982
1983   gtk_widget_show (viewport);
1984   gtk_container_add (GTK_CONTAINER (viewport), child);
1985 }
1986
1987 /*
1988  * _gtk_scrolled_window_get_spacing:
1989  * @scrolled_window: a scrolled window
1990  *
1991  * Gets the spacing between the scrolled window's scrollbars and
1992  * the scrolled widget. Used by GtkCombo
1993  *
1994  * Return value: the spacing, in pixels.
1995  */
1996 gint
1997 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1998 {
1999   GtkScrolledWindowClass *class;
2000
2001   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
2002
2003   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
2004
2005   if (class->scrollbar_spacing >= 0)
2006     return class->scrollbar_spacing;
2007   else
2008     {
2009       gint scrollbar_spacing;
2010
2011       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
2012                             "scrollbar-spacing", &scrollbar_spacing,
2013                             NULL);
2014
2015       return scrollbar_spacing;
2016     }
2017 }
2018
2019
2020 static void
2021 gtk_scrolled_window_get_preferred_size (GtkWidget      *widget,
2022                                         GtkOrientation  orientation,
2023                                         gint           *minimum_size,
2024                                         gint           *natural_size)
2025 {
2026   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
2027   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
2028   GtkBin *bin = GTK_BIN (scrolled_window);
2029   gint extra_width;
2030   gint extra_height;
2031   gint scrollbar_spacing;
2032   GtkRequisition hscrollbar_requisition;
2033   GtkRequisition vscrollbar_requisition;
2034   GtkRequisition minimum_req, natural_req;
2035   GtkStyle *style;
2036   GtkWidget *child;
2037   gint min_child_size, nat_child_size;
2038
2039   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
2040
2041   extra_width = 0;
2042   extra_height = 0;
2043   minimum_req.width = 0;
2044   minimum_req.height = 0;
2045   natural_req.width = 0;
2046   natural_req.height = 0;
2047
2048   gtk_widget_get_preferred_size (priv->hscrollbar,
2049                                  &hscrollbar_requisition, NULL);
2050   gtk_widget_get_preferred_size (priv->vscrollbar,
2051                                  &vscrollbar_requisition, NULL);
2052
2053   child = gtk_bin_get_child (bin);
2054   if (child && gtk_widget_get_visible (child))
2055     {
2056       if (orientation == GTK_ORIENTATION_HORIZONTAL)
2057         {
2058           gtk_widget_get_preferred_width (child,
2059                                           &min_child_size,
2060                                           &nat_child_size);
2061
2062           if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
2063             {
2064               minimum_req.width += min_child_size;
2065               natural_req.width += nat_child_size;
2066             }
2067           else
2068             {
2069               gint min_content_width = priv->min_content_width;
2070
2071               if (min_content_width >= 0)
2072                 {
2073                   minimum_req.width = MAX (minimum_req.width, min_content_width);
2074                   natural_req.width = MAX (natural_req.width, min_content_width);
2075                   extra_width = -1;
2076                 }
2077               else
2078                 {
2079                   minimum_req.width += vscrollbar_requisition.width;
2080                   natural_req.width += vscrollbar_requisition.width;
2081                 }
2082             }
2083         }
2084       else /* GTK_ORIENTATION_VERTICAL */
2085         {
2086           gtk_widget_get_preferred_height (child,
2087                                            &min_child_size,
2088                                            &nat_child_size);
2089
2090           if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
2091             {
2092               minimum_req.height += min_child_size;
2093               natural_req.height += nat_child_size;
2094             }
2095           else
2096             {
2097               gint min_content_height = priv->min_content_height;
2098
2099               if (min_content_height >= 0)
2100                 {
2101                   minimum_req.height = MAX (minimum_req.height, min_content_height);
2102                   natural_req.height = MAX (natural_req.height, min_content_height);
2103                   extra_height = -1;
2104                 }
2105               else
2106                 {
2107                   minimum_req.height += vscrollbar_requisition.height;
2108                   natural_req.height += vscrollbar_requisition.height;
2109                 }
2110             }
2111         }
2112     }
2113
2114   if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
2115       priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
2116     {
2117       minimum_req.width = MAX (minimum_req.width, hscrollbar_requisition.width);
2118       natural_req.width = MAX (natural_req.width, hscrollbar_requisition.width);
2119       if (!extra_height || priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
2120         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
2121     }
2122
2123   if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
2124       priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
2125     {
2126       minimum_req.height = MAX (minimum_req.height, vscrollbar_requisition.height);
2127       natural_req.height = MAX (natural_req.height, vscrollbar_requisition.height);
2128       if (!extra_width || priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
2129         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
2130     }
2131
2132   minimum_req.width  += MAX (0, extra_width);
2133   minimum_req.height += MAX (0, extra_height);
2134   natural_req.width  += MAX (0, extra_width);
2135   natural_req.height += MAX (0, extra_height);
2136
2137   if (priv->shadow_type != GTK_SHADOW_NONE)
2138     {
2139       style = gtk_widget_get_style (GTK_WIDGET (widget));
2140       minimum_req.width += 2 * style->xthickness;
2141       minimum_req.height += 2 * style->ythickness;
2142       natural_req.width += 2 * style->xthickness;
2143       natural_req.height += 2 * style->ythickness;
2144     }
2145
2146   if (orientation == GTK_ORIENTATION_HORIZONTAL)
2147     {
2148       if (minimum_size)
2149         *minimum_size = minimum_req.width;
2150       if (natural_size)
2151         *natural_size = natural_req.width;
2152     }
2153   else
2154     {
2155       if (minimum_size)
2156         *minimum_size = minimum_req.height;
2157       if (natural_size)
2158         *natural_size = natural_req.height;
2159     }
2160 }
2161
2162 static void
2163 gtk_scrolled_window_get_preferred_width (GtkWidget *widget,
2164                                          gint      *minimum_size,
2165                                          gint      *natural_size)
2166 {
2167   gtk_scrolled_window_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
2168 }
2169
2170 static void
2171 gtk_scrolled_window_get_preferred_height (GtkWidget *widget,
2172                                           gint      *minimum_size,
2173                                           gint      *natural_size)
2174 {
2175   gtk_scrolled_window_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
2176 }
2177
2178 static void
2179 gtk_scrolled_window_get_preferred_height_for_width (GtkWidget *widget,
2180                                                     gint       width,
2181                                                     gint      *minimum_height,
2182                                                     gint      *natural_height)
2183 {
2184   g_return_if_fail (GTK_IS_WIDGET (widget));
2185
2186   GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, minimum_height, natural_height);
2187 }
2188
2189 static void
2190 gtk_scrolled_window_get_preferred_width_for_height (GtkWidget *widget,
2191                                                     gint       height,
2192                                                     gint      *minimum_width,
2193                                                     gint      *natural_width)
2194 {
2195   g_return_if_fail (GTK_IS_WIDGET (widget));
2196
2197   GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, minimum_width, natural_width);
2198 }
2199
2200 /**
2201  * gtk_scrolled_window_get_min_content_width:
2202  * @scrolled_window: a #GtkScrolledWindow
2203  *
2204  * Gets the minimum content width of @scrolled_window, or -1 if not set.
2205  *
2206  * Returns: the minimum content width
2207  *
2208  * Since: 3.0
2209  */
2210 gint
2211 gtk_scrolled_window_get_min_content_width (GtkScrolledWindow *scrolled_window)
2212 {
2213   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
2214
2215   return scrolled_window->priv->min_content_width;
2216 }
2217
2218 /**
2219  * gtk_scrolled_window_set_min_content_width:
2220  * @scrolled_window: a #GtkScrolledWindow
2221  * @width: the minimal content width
2222  *
2223  * Sets the minimum width that @scrolled_window should keep visible.
2224  * Note that this can and (usually will) be smaller than the minimum
2225  * size of the content.
2226  *
2227  * Since: 3.0
2228  */
2229 void
2230 gtk_scrolled_window_set_min_content_width (GtkScrolledWindow *scrolled_window,
2231                                            gint               width)
2232 {
2233   GtkScrolledWindowPrivate *priv;
2234
2235   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
2236
2237   priv = scrolled_window->priv;
2238
2239   if (priv->min_content_width != width)
2240     {
2241       priv->min_content_width = width;
2242
2243       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
2244
2245       g_object_notify (G_OBJECT (scrolled_window), "min-content-width");
2246     }
2247 }
2248
2249 /**
2250  * gtk_scrolled_window_get_min_content_height:
2251  * @scrolled_window: a #GtkScrolledWindow
2252  *
2253  * Gets the minimal content height of @scrolled_window, or -1 if not set.
2254  *
2255  * Returns: the minimal content height
2256  *
2257  * Since: 3.0
2258  */
2259 gint
2260 gtk_scrolled_window_get_min_content_height (GtkScrolledWindow *scrolled_window)
2261 {
2262   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
2263
2264   return scrolled_window->priv->min_content_height;
2265 }
2266
2267 /**
2268  * gtk_scrolled_window_set_min_content_height:
2269  * @scrolled_window: a #GtkScrolledWindow
2270  * @height: the minimal content height
2271  *
2272  * Sets the minimum height that @scrolled_window should keep visible.
2273  * Note that this can and (usually will) be smaller than the minimum
2274  * size of the content.
2275  *
2276  * Since: 3.0
2277  */
2278 void
2279 gtk_scrolled_window_set_min_content_height (GtkScrolledWindow *scrolled_window,
2280                                             gint               height)
2281 {
2282   GtkScrolledWindowPrivate *priv;
2283
2284   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
2285
2286   priv = scrolled_window->priv;
2287
2288   if (priv->min_content_height != height)
2289     {
2290       priv->min_content_height = height;
2291
2292       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
2293
2294       g_object_notify (G_OBJECT (scrolled_window), "min-content-height");
2295     }
2296 }