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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include "config.h"
  28 #include <math.h>
  29 #include <gdk/gdkkeysyms.h>
  30 #include "gtkbindings.h"
  31 #include "gtksizerequest.h"
  32 #include "gtkmarshalers.h"
  33 #include "gtkscrolledwindow.h"
  34 #include "gtkwindow.h"
  35 #include "gtkprivate.h"
  36 #include "gtkintl.h"
  37
  38 /* scrolled window policy and size requisition handling:
  39  *
  40  * gtk size requisition works as follows:
  41  *   a widget upon size-request reports the width and height that it finds
  42  *   to be best suited to display its contents, including children.
  43  *   the width and/or height reported from a widget upon size requisition
  44  *   may be overidden by the user by specifying a width and/or height
  45  *   other than 0 through gtk_widget_set_size_request().
  46  *
  47  * a scrolled window needs (for implementing all three policy types) to
  48  * request its width and height based on two different rationales.
  49  * 1)   the user wants the scrolled window to just fit into the space
  50  *      that it gets allocated for a specifc dimension.
  51  * 1.1) this does not apply if the user specified a concrete value
  52  *      value for that specific dimension by either specifying usize for the
  53  *      scrolled window or for its child.
  54  * 2)   the user wants the scrolled window to take as much space up as
  55  *      is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
  56  *
  57  * also, kinda obvious:
  58  * 3)   a user would certainly not have choosen a scrolled window as a container
  59  *      for the child, if the resulting allocation takes up more space than the
  60  *      child would have allocated without the scrolled window.
  61  *
  62  * conclusions:
  63  * A) from 1) follows: the scrolled window shouldn't request more space for a
  64  *    specifc dimension than is required at minimum.
  65  * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
  66  *    window (done automatically) or by usize of the child (needs to be checked).
  67  * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
  68  *    child's dimension.
  69  * D) from 3) follows: the scrolled window child's minimum width and minimum height
  70  *    under A) at least correspond to the space taken up by its scrollbars.
  71  */
  72
  73 #define DEFAULT_SCROLLBAR_SPACING  3
  74
  75 struct _GtkScrolledWindowPrivate
  76 {
  77   GtkCornerType  real_window_placement;
  78   GtkWidget     *hscrollbar;
  79   GtkWidget     *vscrollbar;
  80
  81   gboolean window_placement_set;
  82
  83   guint16  shadow_type;
  84
  85   guint    hscrollbar_policy      : 2;
  86   guint    vscrollbar_policy      : 2;
  87   guint    hscrollbar_visible     : 1;
  88   guint    vscrollbar_visible     : 1;
  89   guint    window_placement       : 2;
  90   guint    focus_out              : 1;   /* Flag used by ::move-focus-out implementation */
  91 };
  92
  93
  94 enum {
  95   PROP_0,
  96   PROP_HADJUSTMENT,
  97   PROP_VADJUSTMENT,
  98   PROP_HSCROLLBAR_POLICY,
  99   PROP_VSCROLLBAR_POLICY,
 100   PROP_WINDOW_PLACEMENT,
 101   PROP_WINDOW_PLACEMENT_SET,
 102   PROP_SHADOW_TYPE
 103 };
 104
 105 /* Signals */
 106 enum
 107 {
 108   SCROLL_CHILD,
 109   MOVE_FOCUS_OUT,
 110   LAST_SIGNAL
 111 };
 112
 113 static void     gtk_scrolled_window_destroy            (GtkObject         *object);
 114 static void     gtk_scrolled_window_set_property       (GObject           *object,
 115                                                         guint              prop_id,
 116                                                         const GValue      *value,
 117                                                         GParamSpec        *pspec);
 118 static void     gtk_scrolled_window_get_property       (GObject           *object,
 119                                                         guint              prop_id,
 120                                                         GValue            *value,
 121                                                         GParamSpec        *pspec);
 122
 123 static void     gtk_scrolled_window_screen_changed     (GtkWidget         *widget,
 124                                                         GdkScreen         *previous_screen);
 125 static gboolean gtk_scrolled_window_draw               (GtkWidget         *widget,
 126                                                         cairo_t           *cr);
 127 static void     gtk_scrolled_window_size_allocate      (GtkWidget         *widget,
 128                                                         GtkAllocation     *allocation);
 129 static gboolean gtk_scrolled_window_scroll_event       (GtkWidget         *widget,
 130                                                         GdkEventScroll    *event);
 131 static gboolean gtk_scrolled_window_focus              (GtkWidget         *widget,
 132                                                         GtkDirectionType   direction);
 133 static void     gtk_scrolled_window_add                (GtkContainer      *container,
 134                                                         GtkWidget         *widget);
 135 static void     gtk_scrolled_window_remove             (GtkContainer      *container,
 136                                                         GtkWidget         *widget);
 137 static void     gtk_scrolled_window_forall             (GtkContainer      *container,
 138                                                         gboolean           include_internals,
 139                                                         GtkCallback        callback,
 140                                                         gpointer           callback_data);
 141 static gboolean gtk_scrolled_window_scroll_child       (GtkScrolledWindow *scrolled_window,
 142                                                         GtkScrollType      scroll,
 143                                                         gboolean           horizontal);
 144 static void     gtk_scrolled_window_move_focus_out     (GtkScrolledWindow *scrolled_window,
 145                                                         GtkDirectionType   direction_type);
 146
 147 static void     gtk_scrolled_window_relative_allocation(GtkWidget         *widget,
 148                                                         GtkAllocation     *allocation);
 149 static void     gtk_scrolled_window_adjustment_changed (GtkAdjustment     *adjustment,
 150                                                         gpointer           data);
 151
 152 static void  gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window);
 153
 154 static void  gtk_scrolled_window_size_request_init     (GtkSizeRequestIface *iface);
 155 static void  gtk_scrolled_window_get_width             (GtkSizeRequest      *widget,
 156                                                         gint                *minimum_size,
 157                                                         gint                *natural_size);
 158 static void  gtk_scrolled_window_get_height            (GtkSizeRequest      *widget,
 159                                                         gint                *minimum_size,
 160                                                         gint                *natural_size);
 161 static void  gtk_scrolled_window_get_height_for_width  (GtkSizeRequest      *layout,
 162                                                         gint                 width,
 163                                                         gint                *minimum_height,
 164                                                         gint                *natural_height);
 165 static void  gtk_scrolled_window_get_width_for_height  (GtkSizeRequest      *layout,
 166                                                         gint                 width,
 167                                                         gint                *minimum_height,
 168                                                         gint                *natural_height);
 169
 170 static guint signals[LAST_SIGNAL] = {0};
 171
 172 G_DEFINE_TYPE_WITH_CODE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN,
 173                          G_IMPLEMENT_INTERFACE (GTK_TYPE_SIZE_REQUEST,
 174                                                 gtk_scrolled_window_size_request_init))
 175
 176
 177 static void
 178 add_scroll_binding (GtkBindingSet  *binding_set,
 179                     guint           keyval,
 180                     GdkModifierType mask,
 181                     GtkScrollType   scroll,
 182                     gboolean        horizontal)
 183 {
 184   guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left;
 185
 186   gtk_binding_entry_add_signal (binding_set, keyval, mask,
 187                                 "scroll-child", 2,
 188                                 GTK_TYPE_SCROLL_TYPE, scroll,
 189                                 G_TYPE_BOOLEAN, horizontal);
 190   gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
 191                                 "scroll-child", 2,
 192                                 GTK_TYPE_SCROLL_TYPE, scroll,
 193                                 G_TYPE_BOOLEAN, horizontal);
 194 }
 195
 196 static void
 197 add_tab_bindings (GtkBindingSet    *binding_set,
 198                   GdkModifierType   modifiers,
 199                   GtkDirectionType  direction)
 200 {
 201   gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers,
 202                                 "move-focus-out", 1,
 203                                 GTK_TYPE_DIRECTION_TYPE, direction);
 204   gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers,
 205                                 "move-focus-out", 1,
 206                                 GTK_TYPE_DIRECTION_TYPE, direction);
 207 }
 208
 209 static void
 210 gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
 211 {
 212   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 213   GtkObjectClass *object_class;
 214   GtkWidgetClass *widget_class;
 215   GtkContainerClass *container_class;
 216   GtkBindingSet *binding_set;
 217
 218   object_class = (GtkObjectClass*) class;
 219   widget_class = (GtkWidgetClass*) class;
 220   container_class = (GtkContainerClass*) class;
 221
 222   gobject_class->set_property = gtk_scrolled_window_set_property;
 223   gobject_class->get_property = gtk_scrolled_window_get_property;
 224
 225   object_class->destroy = gtk_scrolled_window_destroy;
 226
 227   widget_class->screen_changed = gtk_scrolled_window_screen_changed;
 228   widget_class->draw = gtk_scrolled_window_draw;
 229   widget_class->size_allocate = gtk_scrolled_window_size_allocate;
 230   widget_class->scroll_event = gtk_scrolled_window_scroll_event;
 231   widget_class->focus = gtk_scrolled_window_focus;
 232
 233   container_class->add = gtk_scrolled_window_add;
 234   container_class->remove = gtk_scrolled_window_remove;
 235   container_class->forall = gtk_scrolled_window_forall;
 236
 237   class->scrollbar_spacing = -1;
 238
 239   class->scroll_child = gtk_scrolled_window_scroll_child;
 240   class->move_focus_out = gtk_scrolled_window_move_focus_out;
 241
 242   g_object_class_install_property (gobject_class,
 243                                    PROP_HADJUSTMENT,
 244                                    g_param_spec_object ("hadjustment",
 245                                                         P_("Horizontal Adjustment"),
 246                                                         P_("The GtkAdjustment for the horizontal position"),
 247                                                         GTK_TYPE_ADJUSTMENT,
 248                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 249   g_object_class_install_property (gobject_class,
 250                                    PROP_VADJUSTMENT,
 251                                    g_param_spec_object ("vadjustment",
 252                                                         P_("Vertical Adjustment"),
 253                                                         P_("The GtkAdjustment for the vertical position"),
 254                                                         GTK_TYPE_ADJUSTMENT,
 255                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
 256   g_object_class_install_property (gobject_class,
 257                                    PROP_HSCROLLBAR_POLICY,
 258                                    g_param_spec_enum ("hscrollbar-policy",
 259                                                       P_("Horizontal Scrollbar Policy"),
 260                                                       P_("When the horizontal scrollbar is displayed"),
 261                                                       GTK_TYPE_POLICY_TYPE,
 262                                                       GTK_POLICY_AUTOMATIC,
 263                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 264   g_object_class_install_property (gobject_class,
 265                                    PROP_VSCROLLBAR_POLICY,
 266                                    g_param_spec_enum ("vscrollbar-policy",
 267                                                       P_("Vertical Scrollbar Policy"),
 268                                                       P_("When the vertical scrollbar is displayed"),
 269                                                       GTK_TYPE_POLICY_TYPE,
 270                                                       GTK_POLICY_AUTOMATIC,
 271                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 272
 273   g_object_class_install_property (gobject_class,
 274                                    PROP_WINDOW_PLACEMENT,
 275                                    g_param_spec_enum ("window-placement",
 276                                                       P_("Window Placement"),
 277                                                       P_("Where the contents are located with respect to the scrollbars. This property only takes effect if \"window-placement-set\" is TRUE."),
 278                                                       GTK_TYPE_CORNER_TYPE,
 279                                                       GTK_CORNER_TOP_LEFT,
 280                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 281
 282   /**
 283    * GtkScrolledWindow:window-placement-set:
 284    *
 285    * Whether "window-placement" should be used to determine the location
 286    * of the contents with respect to the scrollbars. Otherwise, the
 287    * "gtk-scrolled-window-placement" setting is used.
 288    *
 289    * Since: 2.10
 290    */
 291   g_object_class_install_property (gobject_class,
 292                                    PROP_WINDOW_PLACEMENT_SET,
 293                                    g_param_spec_boolean ("window-placement-set",
 294                                                          P_("Window Placement Set"),
 295                                                          P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
 296                                                          FALSE,
 297                                                          GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 298   g_object_class_install_property (gobject_class,
 299                                    PROP_SHADOW_TYPE,
 300                                    g_param_spec_enum ("shadow-type",
 301                                                       P_("Shadow Type"),
 302                                                       P_("Style of bevel around the contents"),
 303                                                       GTK_TYPE_SHADOW_TYPE,
 304                                                       GTK_SHADOW_NONE,
 305                                                       GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
 306
 307   /**
 308    * GtkScrolledWindow:scrollbars-within-bevel:
 309    *
 310    * Whether to place scrollbars within the scrolled window's bevel.
 311    *
 312    * Since: 2.12
 313    */
 314   gtk_widget_class_install_style_property (widget_class,
 315                                            g_param_spec_boolean ("scrollbars-within-bevel",
 316                                                                  P_("Scrollbars within bevel"),
 317                                                                  P_("Place scrollbars within the scrolled window's bevel"),
 318                                                                  FALSE,
 319                                                                  GTK_PARAM_READABLE));
 320
 321   gtk_widget_class_install_style_property (widget_class,
 322                                            g_param_spec_int ("scrollbar-spacing",
 323                                                              P_("Scrollbar spacing"),
 324                                                              P_("Number of pixels between the scrollbars and the scrolled window"),
 325                                                              0,
 326                                                              G_MAXINT,
 327                                                              DEFAULT_SCROLLBAR_SPACING,
 328                                                              GTK_PARAM_READABLE));
 329
 330   /**
 331    * GtkSettings:gtk-scrolled-window-placement:
 332    *
 333    * Where the contents of scrolled windows are located with respect to the
 334    * scrollbars, if not overridden by the scrolled window's own placement.
 335    *
 336    * Since: 2.10
 337    */
 338   gtk_settings_install_property (g_param_spec_enum ("gtk-scrolled-window-placement",
 339                                                     P_("Scrolled Window Placement"),
 340                                                     P_("Where the contents of scrolled windows are located with respect to the scrollbars, if not overridden by the scrolled window's own placement."),
 341                                                     GTK_TYPE_CORNER_TYPE,
 342                                                     GTK_CORNER_TOP_LEFT,
 343                                                     G_PARAM_READABLE | G_PARAM_WRITABLE));
 344
 345
 346   signals[SCROLL_CHILD] =
 347     g_signal_new (I_("scroll-child"),
 348                   G_TYPE_FROM_CLASS (object_class),
 349                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 350                   G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
 351                   NULL, NULL,
 352                   _gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
 353                   G_TYPE_BOOLEAN, 2,
 354                   GTK_TYPE_SCROLL_TYPE,
 355                   G_TYPE_BOOLEAN);
 356   signals[MOVE_FOCUS_OUT] =
 357     g_signal_new (I_("move-focus-out"),
 358                   G_TYPE_FROM_CLASS (object_class),
 359                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
 360                   G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
 361                   NULL, NULL,
 362                   _gtk_marshal_VOID__ENUM,
 363                   G_TYPE_NONE, 1,
 364                   GTK_TYPE_DIRECTION_TYPE);
 365
 366   binding_set = gtk_binding_set_by_class (class);
 367
 368   add_scroll_binding (binding_set, GDK_KEY_Left,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
 369   add_scroll_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  TRUE);
 370   add_scroll_binding (binding_set, GDK_KEY_Up,    GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
 371   add_scroll_binding (binding_set, GDK_KEY_Down,  GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD,  FALSE);
 372
 373   add_scroll_binding (binding_set, GDK_KEY_Page_Up,   GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
 374   add_scroll_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD,  TRUE);
 375   add_scroll_binding (binding_set, GDK_KEY_Page_Up,   0,                GTK_SCROLL_PAGE_BACKWARD, FALSE);
 376   add_scroll_binding (binding_set, GDK_KEY_Page_Down, 0,                GTK_SCROLL_PAGE_FORWARD,  FALSE);
 377
 378   add_scroll_binding (binding_set, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
 379   add_scroll_binding (binding_set, GDK_KEY_End,  GDK_CONTROL_MASK, GTK_SCROLL_END,   TRUE);
 380   add_scroll_binding (binding_set, GDK_KEY_Home, 0,                GTK_SCROLL_START, FALSE);
 381   add_scroll_binding (binding_set, GDK_KEY_End,  0,                GTK_SCROLL_END,   FALSE);
 382
 383   add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
 384   add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
 385
 386   g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
 387 }
 388
 389 static void
 390 gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 391 {
 392   GtkScrolledWindowPrivate *priv;
 393
 394   scrolled_window->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (scrolled_window,
 395                                                               GTK_TYPE_SCROLLED_WINDOW,
 396                                                               GtkScrolledWindowPrivate);
 397
 398   gtk_widget_set_has_window (GTK_WIDGET (scrolled_window), FALSE);
 399   gtk_widget_set_can_focus (GTK_WIDGET (scrolled_window), TRUE);
 400
 401   priv->hscrollbar = NULL;
 402   priv->vscrollbar = NULL;
 403   priv->hscrollbar_policy = GTK_POLICY_AUTOMATIC;
 404   priv->vscrollbar_policy = GTK_POLICY_AUTOMATIC;
 405   priv->hscrollbar_visible = FALSE;
 406   priv->vscrollbar_visible = FALSE;
 407   priv->focus_out = FALSE;
 408   priv->window_placement = GTK_CORNER_TOP_LEFT;
 409   gtk_scrolled_window_update_real_placement (scrolled_window);
 410 }
 411
 412 /**
 413  * gtk_scrolled_window_new:
 414  * @hadjustment: (allow-none): horizontal adjustment
 415  * @vadjustment: (allow-none): vertical adjustment
 416  *
 417  * Creates a new scrolled window.
 418  *
 419  * The two arguments are the scrolled window's adjustments; these will be
 420  * shared with the scrollbars and the child widget to keep the bars in sync
 421  * with the child. Usually you want to pass %NULL for the adjustments, which
 422  * will cause the scrolled window to create them for you.
 423  *
 424  * Returns: a new scrolled window
 425  */
 426 GtkWidget*
 427 gtk_scrolled_window_new (GtkAdjustment *hadjustment,
 428                          GtkAdjustment *vadjustment)
 429 {
 430   GtkWidget *scrolled_window;
 431
 432   if (hadjustment)
 433     g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
 434
 435   if (vadjustment)
 436     g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
 437
 438   scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
 439                                     "hadjustment", hadjustment,
 440                                     "vadjustment", vadjustment,
 441                                     NULL);
 442
 443   return scrolled_window;
 444 }
 445
 446 /**
 447  * gtk_scrolled_window_set_hadjustment:
 448  * @scrolled_window: a #GtkScrolledWindow
 449  * @hadjustment: horizontal scroll adjustment
 450  *
 451  * Sets the #GtkAdjustment for the horizontal scrollbar.
 452  */
 453 void
 454 gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
 455                                      GtkAdjustment     *hadjustment)
 456 {
 457   GtkScrolledWindowPrivate *priv;
 458   GtkBin *bin;
 459   GtkWidget *child;
 460
 461   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 462   if (hadjustment)
 463     g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
 464   else
 465     hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 466
 467   bin = GTK_BIN (scrolled_window);
 468   priv = scrolled_window->priv;
 469
 470   if (!priv->hscrollbar)
 471     {
 472       gtk_widget_push_composite_child ();
 473       priv->hscrollbar = gtk_hscrollbar_new (hadjustment);
 474       gtk_widget_set_composite_name (priv->hscrollbar, "hscrollbar");
 475       gtk_widget_pop_composite_child ();
 476
 477       gtk_widget_set_parent (priv->hscrollbar, GTK_WIDGET (scrolled_window));
 478       g_object_ref (priv->hscrollbar);
 479       gtk_widget_show (priv->hscrollbar);
 480     }
 481   else
 482     {
 483       GtkAdjustment *old_adjustment;
 484
 485       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
 486       if (old_adjustment == hadjustment)
 487         return;
 488
 489       g_signal_handlers_disconnect_by_func (old_adjustment,
 490                                             gtk_scrolled_window_adjustment_changed,
 491                                             scrolled_window);
 492       gtk_range_set_adjustment (GTK_RANGE (priv->hscrollbar),
 493                                 hadjustment);
 494     }
 495   hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
 496   g_signal_connect (hadjustment,
 497                     "changed",
 498                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 499                     scrolled_window);
 500   gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
 501
 502   child = gtk_bin_get_child (bin);
 503   if (child)
 504     gtk_widget_set_scroll_adjustments (child,
 505                                        gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
 506                                        gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)));
 507
 508   g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
 509 }
 510
 511 /**
 512  * gtk_scrolled_window_set_vadjustment:
 513  * @scrolled_window: a #GtkScrolledWindow
 514  * @vadjustment: vertical scroll adjustment
 515  *
 516  * Sets the #GtkAdjustment for the vertical scrollbar.
 517  */
 518 void
 519 gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
 520                                      GtkAdjustment     *vadjustment)
 521 {
 522   GtkScrolledWindowPrivate *priv;
 523   GtkBin *bin;
 524   GtkWidget *child;
 525
 526   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 527   if (vadjustment)
 528     g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
 529   else
 530     vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
 531
 532   bin = GTK_BIN (scrolled_window);
 533   priv = scrolled_window->priv;
 534
 535   if (!priv->vscrollbar)
 536     {
 537       gtk_widget_push_composite_child ();
 538       priv->vscrollbar = gtk_vscrollbar_new (vadjustment);
 539       gtk_widget_set_composite_name (priv->vscrollbar, "vscrollbar");
 540       gtk_widget_pop_composite_child ();
 541
 542       gtk_widget_set_parent (priv->vscrollbar, GTK_WIDGET (scrolled_window));
 543       g_object_ref (priv->vscrollbar);
 544       gtk_widget_show (priv->vscrollbar);
 545     }
 546   else
 547     {
 548       GtkAdjustment *old_adjustment;
 549
 550       old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
 551       if (old_adjustment == vadjustment)
 552         return;
 553
 554       g_signal_handlers_disconnect_by_func (old_adjustment,
 555                                             gtk_scrolled_window_adjustment_changed,
 556                                             scrolled_window);
 557       gtk_range_set_adjustment (GTK_RANGE (priv->vscrollbar),
 558                                 vadjustment);
 559     }
 560   vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
 561   g_signal_connect (vadjustment,
 562                     "changed",
 563                     G_CALLBACK (gtk_scrolled_window_adjustment_changed),
 564                     scrolled_window);
 565   gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
 566
 567   child = gtk_bin_get_child (bin);
 568   if (child)
 569     gtk_widget_set_scroll_adjustments (child,
 570                                        gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
 571                                        gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)));
 572
 573   g_object_notify (G_OBJECT (scrolled_window), "vadjustment");
 574 }
 575
 576 /**
 577  * gtk_scrolled_window_get_hadjustment:
 578  * @scrolled_window: a #GtkScrolledWindow
 579  *
 580  * Returns the horizontal scrollbar's adjustment, used to connect the
 581  * horizontal scrollbar to the child widget's horizontal scroll
 582  * functionality.
 583  *
 584  * Returns: (transfer none): the horizontal #GtkAdjustment
 585  */
 586 GtkAdjustment*
 587 gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
 588 {
 589   GtkScrolledWindowPrivate *priv;
 590
 591   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 592
 593   priv = scrolled_window->priv;
 594
 595   return (priv->hscrollbar ?
 596           gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)) :
 597           NULL);
 598 }
 599
 600 /**
 601  * gtk_scrolled_window_get_vadjustment:
 602  * @scrolled_window: a #GtkScrolledWindow
 603  *
 604  * Returns the vertical scrollbar's adjustment, used to connect the
 605  * vertical scrollbar to the child widget's vertical scroll functionality.
 606  *
 607  * Returns: (transfer none): the vertical #GtkAdjustment
 608  */
 609 GtkAdjustment*
 610 gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
 611 {
 612   GtkScrolledWindowPrivate *priv;
 613
 614   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 615
 616   priv = scrolled_window->priv;
 617
 618   return (priv->vscrollbar ?
 619           gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)) :
 620           NULL);
 621 }
 622
 623 /**
 624  * gtk_scrolled_window_get_hscrollbar:
 625  * @scrolled_window: a #GtkScrolledWindow
 626  *
 627  * Returns the horizontal scrollbar of @scrolled_window.
 628  *
 629  * Returns: (transfer none): the horizontal scrollbar of the scrolled window,
 630  *     or %NULL if it does not have one.
 631  *
 632  * Since: 2.8
 633  */
 634 GtkWidget*
 635 gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
 636 {
 637   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 638
 639   return scrolled_window->priv->hscrollbar;
 640 }
 641
 642 /**
 643  * gtk_scrolled_window_get_vscrollbar:
 644  * @scrolled_window: a #GtkScrolledWindow
 645  *
 646  * Returns the vertical scrollbar of @scrolled_window.
 647  *
 648  * Returns: (transfer none): the vertical scrollbar of the scrolled window,
 649  *     or %NULL if it does not have one.
 650  *
 651  * Since: 2.8
 652  */
 653 GtkWidget*
 654 gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
 655 {
 656   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
 657
 658   return scrolled_window->priv->vscrollbar;
 659 }
 660
 661 /**
 662  * gtk_scrolled_window_set_policy:
 663  * @scrolled_window: a #GtkScrolledWindow
 664  * @hscrollbar_policy: policy for horizontal bar
 665  * @vscrollbar_policy: policy for vertical bar
 666  *
 667  * Sets the scrollbar policy for the horizontal and vertical scrollbars.
 668  *
 669  * The policy determines when the scrollbar should appear; it is a value
 670  * from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
 671  * scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
 672  * never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
 673  * if needed (that is, if the slider part of the bar would be smaller
 674  * than the trough - the display is larger than the page size).
 675  */
 676 void
 677 gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 678                                 GtkPolicyType      hscrollbar_policy,
 679                                 GtkPolicyType      vscrollbar_policy)
 680 {
 681   GtkScrolledWindowPrivate *priv;
 682   GObject *object = G_OBJECT (scrolled_window);
 683
 684   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 685
 686   priv = scrolled_window->priv;
 687
 688   if ((priv->hscrollbar_policy != hscrollbar_policy) ||
 689       (priv->vscrollbar_policy != vscrollbar_policy))
 690     {
 691       priv->hscrollbar_policy = hscrollbar_policy;
 692       priv->vscrollbar_policy = vscrollbar_policy;
 693
 694       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 695
 696       g_object_freeze_notify (object);
 697       g_object_notify (object, "hscrollbar-policy");
 698       g_object_notify (object, "vscrollbar-policy");
 699       g_object_thaw_notify (object);
 700     }
 701 }
 702
 703 /**
 704  * gtk_scrolled_window_get_policy:
 705  * @scrolled_window: a #GtkScrolledWindow
 706  * @hscrollbar_policy: location to store the policy for the horizontal
 707  *     scrollbar, or %NULL.
 708  * @vscrollbar_policy: location to store the policy for the vertical
 709  *     scrollbar, or %NULL.
 710  *
 711  * Retrieves the current policy values for the horizontal and vertical
 712  * scrollbars. See gtk_scrolled_window_set_policy().
 713  */
 714 void
 715 gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
 716                                 GtkPolicyType     *hscrollbar_policy,
 717                                 GtkPolicyType     *vscrollbar_policy)
 718 {
 719   GtkScrolledWindowPrivate *priv;
 720
 721   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 722
 723   priv = scrolled_window->priv;
 724
 725   if (hscrollbar_policy)
 726     *hscrollbar_policy = priv->hscrollbar_policy;
 727   if (vscrollbar_policy)
 728     *vscrollbar_policy = priv->vscrollbar_policy;
 729 }
 730
 731 static void
 732 gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window)
 733 {
 734   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 735   GtkSettings *settings;
 736
 737   settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
 738
 739   if (priv->window_placement_set || settings == NULL)
 740     priv->real_window_placement = priv->window_placement;
 741   else
 742     g_object_get (settings,
 743                   "gtk-scrolled-window-placement",
 744                   &priv->real_window_placement,
 745                   NULL);
 746 }
 747
 748 static void
 749 gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
 750                                             GtkCornerType      window_placement)
 751 {
 752   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 753
 754   if (priv->window_placement != window_placement)
 755     {
 756       priv->window_placement = window_placement;
 757
 758       gtk_scrolled_window_update_real_placement (scrolled_window);
 759       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 760
 761       g_object_notify (G_OBJECT (scrolled_window), "window-placement");
 762     }
 763 }
 764
 765 static void
 766 gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
 767                                        gboolean           placement_set,
 768                                        gboolean           emit_resize)
 769 {
 770   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 771
 772   if (priv->window_placement_set != placement_set)
 773     {
 774       priv->window_placement_set = placement_set;
 775
 776       gtk_scrolled_window_update_real_placement (scrolled_window);
 777       if (emit_resize)
 778         gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 779
 780       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 781     }
 782 }
 783
 784 /**
 785  * gtk_scrolled_window_set_placement:
 786  * @scrolled_window: a #GtkScrolledWindow
 787  * @window_placement: position of the child window
 788  *
 789  * Sets the placement of the contents with respect to the scrollbars
 790  * for the scrolled window.
 791  *
 792  * The default is %GTK_CORNER_TOP_LEFT, meaning the child is
 793  * in the top left, with the scrollbars underneath and to the right.
 794  * Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
 795  * %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
 796  *
 797  * See also gtk_scrolled_window_get_placement() and
 798  * gtk_scrolled_window_unset_placement().
 799  */
 800 void
 801 gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
 802                                    GtkCornerType      window_placement)
 803 {
 804   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 805
 806   gtk_scrolled_window_set_placement_set (scrolled_window, TRUE, FALSE);
 807   gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement);
 808 }
 809
 810 /**
 811  * gtk_scrolled_window_get_placement:
 812  * @scrolled_window: a #GtkScrolledWindow
 813  *
 814  * Gets the placement of the contents with respect to the scrollbars
 815  * for the scrolled window. See gtk_scrolled_window_set_placement().
 816  *
 817  * Return value: the current placement value.
 818  *
 819  * See also gtk_scrolled_window_set_placement() and
 820  * gtk_scrolled_window_unset_placement().
 821  **/
 822 GtkCornerType
 823 gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
 824 {
 825   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
 826
 827   return scrolled_window->priv->window_placement;
 828 }
 829
 830 /**
 831  * gtk_scrolled_window_unset_placement:
 832  * @scrolled_window: a #GtkScrolledWindow
 833  *
 834  * Unsets the placement of the contents with respect to the scrollbars
 835  * for the scrolled window. If no window placement is set for a scrolled
 836  * window, it obeys the "gtk-scrolled-window-placement" XSETTING.
 837  *
 838  * See also gtk_scrolled_window_set_placement() and
 839  * gtk_scrolled_window_get_placement().
 840  *
 841  * Since: 2.10
 842  **/
 843 void
 844 gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
 845 {
 846   GtkScrolledWindowPrivate *priv;
 847
 848   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 849
 850   priv = scrolled_window->priv;
 851
 852   if (priv->window_placement_set)
 853     {
 854       priv->window_placement_set = FALSE;
 855
 856       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 857
 858       g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
 859     }
 860 }
 861
 862 /**
 863  * gtk_scrolled_window_set_shadow_type:
 864  * @scrolled_window: a #GtkScrolledWindow
 865  * @type: kind of shadow to draw around scrolled window contents
 866  *
 867  * Changes the type of shadow drawn around the contents of
 868  * @scrolled_window.
 869  *
 870  **/
 871 void
 872 gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
 873                                      GtkShadowType      type)
 874 {
 875   GtkScrolledWindowPrivate *priv;
 876
 877   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
 878   g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
 879
 880   priv = scrolled_window->priv;
 881
 882   if (priv->shadow_type != type)
 883     {
 884       priv->shadow_type = type;
 885
 886       if (gtk_widget_is_drawable (GTK_WIDGET (scrolled_window)))
 887         gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
 888
 889       gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
 890
 891       g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
 892     }
 893 }
 894
 895 /**
 896  * gtk_scrolled_window_get_shadow_type:
 897  * @scrolled_window: a #GtkScrolledWindow
 898  *
 899  * Gets the shadow type of the scrolled window. See
 900  * gtk_scrolled_window_set_shadow_type().
 901  *
 902  * Return value: the current shadow type
 903  **/
 904 GtkShadowType
 905 gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
 906 {
 907   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
 908
 909   return scrolled_window->priv->shadow_type;
 910 }
 911
 912 static void
 913 gtk_scrolled_window_destroy (GtkObject *object)
 914 {
 915   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 916   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 917
 918   if (priv->hscrollbar)
 919     {
 920       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
 921                                             gtk_scrolled_window_adjustment_changed,
 922                                             scrolled_window);
 923       gtk_widget_unparent (priv->hscrollbar);
 924       gtk_widget_destroy (priv->hscrollbar);
 925       g_object_unref (priv->hscrollbar);
 926       priv->hscrollbar = NULL;
 927     }
 928   if (priv->vscrollbar)
 929     {
 930       g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)),
 931                                             gtk_scrolled_window_adjustment_changed,
 932                                             scrolled_window);
 933       gtk_widget_unparent (priv->vscrollbar);
 934       gtk_widget_destroy (priv->vscrollbar);
 935       g_object_unref (priv->vscrollbar);
 936       priv->vscrollbar = NULL;
 937     }
 938
 939   GTK_OBJECT_CLASS (gtk_scrolled_window_parent_class)->destroy (object);
 940 }
 941
 942 static void
 943 gtk_scrolled_window_set_property (GObject      *object,
 944                                   guint         prop_id,
 945                                   const GValue *value,
 946                                   GParamSpec   *pspec)
 947 {
 948   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 949   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 950
 951   switch (prop_id)
 952     {
 953     case PROP_HADJUSTMENT:
 954       gtk_scrolled_window_set_hadjustment (scrolled_window,
 955                                            g_value_get_object (value));
 956       break;
 957     case PROP_VADJUSTMENT:
 958       gtk_scrolled_window_set_vadjustment (scrolled_window,
 959                                            g_value_get_object (value));
 960       break;
 961     case PROP_HSCROLLBAR_POLICY:
 962       gtk_scrolled_window_set_policy (scrolled_window,
 963                                       g_value_get_enum (value),
 964                                       priv->vscrollbar_policy);
 965       break;
 966     case PROP_VSCROLLBAR_POLICY:
 967       gtk_scrolled_window_set_policy (scrolled_window,
 968                                       priv->hscrollbar_policy,
 969                                       g_value_get_enum (value));
 970       break;
 971     case PROP_WINDOW_PLACEMENT:
 972       gtk_scrolled_window_set_placement_internal (scrolled_window,
 973                                                   g_value_get_enum (value));
 974       break;
 975     case PROP_WINDOW_PLACEMENT_SET:
 976       gtk_scrolled_window_set_placement_set (scrolled_window,
 977                                              g_value_get_boolean (value),
 978                                              TRUE);
 979       break;
 980     case PROP_SHADOW_TYPE:
 981       gtk_scrolled_window_set_shadow_type (scrolled_window,
 982                                            g_value_get_enum (value));
 983       break;
 984     default:
 985       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 986       break;
 987     }
 988 }
 989
 990 static void
 991 gtk_scrolled_window_get_property (GObject    *object,
 992                                   guint       prop_id,
 993                                   GValue     *value,
 994                                   GParamSpec *pspec)
 995 {
 996   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
 997   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
 998
 999   switch (prop_id)
1000     {
1001     case PROP_HADJUSTMENT:
1002       g_value_set_object (value,
1003                           G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
1004       break;
1005     case PROP_VADJUSTMENT:
1006       g_value_set_object (value,
1007                           G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
1008       break;
1009     case PROP_HSCROLLBAR_POLICY:
1010       g_value_set_enum (value, priv->hscrollbar_policy);
1011       break;
1012     case PROP_VSCROLLBAR_POLICY:
1013       g_value_set_enum (value, priv->vscrollbar_policy);
1014       break;
1015     case PROP_WINDOW_PLACEMENT:
1016       g_value_set_enum (value, priv->window_placement);
1017       break;
1018     case PROP_WINDOW_PLACEMENT_SET:
1019       g_value_set_boolean (value, priv->window_placement_set);
1020       break;
1021     case PROP_SHADOW_TYPE:
1022       g_value_set_enum (value, priv->shadow_type);
1023       break;
1024     default:
1025       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1026       break;
1027     }
1028 }
1029
1030 static void
1031 traverse_container (GtkWidget *widget,
1032                     gpointer   data)
1033 {
1034   if (GTK_IS_SCROLLED_WINDOW (widget))
1035     {
1036       gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1037       gtk_widget_queue_resize (widget);
1038     }
1039   else if (GTK_IS_CONTAINER (widget))
1040     gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
1041 }
1042
1043 static void
1044 gtk_scrolled_window_settings_changed (GtkSettings *settings)
1045 {
1046   GList *list, *l;
1047
1048   list = gtk_window_list_toplevels ();
1049
1050   for (l = list; l; l = l->next)
1051     gtk_container_forall (GTK_CONTAINER (l->data),
1052                           traverse_container, NULL);
1053
1054   g_list_free (list);
1055 }
1056
1057 static void
1058 gtk_scrolled_window_screen_changed (GtkWidget *widget,
1059                                     GdkScreen *previous_screen)
1060 {
1061   GtkSettings *settings;
1062   guint window_placement_connection;
1063
1064   gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
1065
1066   if (!gtk_widget_has_screen (widget))
1067     return;
1068
1069   settings = gtk_widget_get_settings (widget);
1070
1071   window_placement_connection =
1072     GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
1073                                          "gtk-scrolled-window-connection"));
1074
1075   if (window_placement_connection)
1076     return;
1077
1078   window_placement_connection =
1079     g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
1080                       G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
1081   g_object_set_data (G_OBJECT (settings),
1082                      I_("gtk-scrolled-window-connection"),
1083                      GUINT_TO_POINTER (window_placement_connection));
1084 }
1085
1086 static gboolean
1087 gtk_scrolled_window_draw (GtkWidget *widget,
1088                           cairo_t   *cr)
1089 {
1090   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1091   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1092
1093   if (priv->shadow_type != GTK_SHADOW_NONE)
1094     {
1095       GtkAllocation relative_allocation;
1096       GtkStyle *style;
1097       gboolean scrollbars_within_bevel;
1098
1099       style = gtk_widget_get_style (widget);
1100       gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1101
1102       if (!scrollbars_within_bevel)
1103         {
1104           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1105
1106           relative_allocation.x -= style->xthickness;
1107           relative_allocation.y -= style->ythickness;
1108           relative_allocation.width += 2 * style->xthickness;
1109           relative_allocation.height += 2 * style->ythickness;
1110         }
1111       else
1112         {
1113           GtkContainer *container = GTK_CONTAINER (widget);
1114           guint border_width;
1115
1116           border_width = gtk_container_get_border_width (container);
1117
1118           relative_allocation.x = border_width;
1119           relative_allocation.y = border_width;
1120           relative_allocation.width = gtk_widget_get_allocated_width (widget) - 2 * border_width;
1121           relative_allocation.height = gtk_widget_get_allocated_height (widget) - 2 * border_width;
1122         }
1123
1124       gtk_paint_shadow (style,
1125                         cr,
1126                         GTK_STATE_NORMAL, priv->shadow_type,
1127                         widget, "scrolled_window",
1128                         relative_allocation.x,
1129                         relative_allocation.y,
1130                         relative_allocation.width,
1131                         relative_allocation.height);
1132     }
1133
1134   GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->draw (widget, cr);
1135
1136   return FALSE;
1137 }
1138
1139 static void
1140 gtk_scrolled_window_forall (GtkContainer *container,
1141                             gboolean      include_internals,
1142                             GtkCallback   callback,
1143                             gpointer      callback_data)
1144 {
1145   GtkScrolledWindowPrivate *priv;
1146   GtkScrolledWindow *scrolled_window;
1147
1148   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1149   g_return_if_fail (callback != NULL);
1150
1151   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
1152                                               include_internals,
1153                                               callback,
1154                                               callback_data);
1155   if (include_internals)
1156     {
1157       scrolled_window = GTK_SCROLLED_WINDOW (container);
1158       priv = scrolled_window->priv;
1159
1160       if (priv->vscrollbar)
1161         callback (priv->vscrollbar, callback_data);
1162       if (priv->hscrollbar)
1163         callback (priv->hscrollbar, callback_data);
1164     }
1165 }
1166
1167 static gboolean
1168 gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
1169                                   GtkScrollType      scroll,
1170                                   gboolean           horizontal)
1171 {
1172   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1173   GtkAdjustment *adjustment = NULL;
1174
1175   switch (scroll)
1176     {
1177     case GTK_SCROLL_STEP_UP:
1178       scroll = GTK_SCROLL_STEP_BACKWARD;
1179       horizontal = FALSE;
1180       break;
1181     case GTK_SCROLL_STEP_DOWN:
1182       scroll = GTK_SCROLL_STEP_FORWARD;
1183       horizontal = FALSE;
1184       break;
1185     case GTK_SCROLL_STEP_LEFT:
1186       scroll = GTK_SCROLL_STEP_BACKWARD;
1187       horizontal = TRUE;
1188       break;
1189     case GTK_SCROLL_STEP_RIGHT:
1190       scroll = GTK_SCROLL_STEP_FORWARD;
1191       horizontal = TRUE;
1192       break;
1193     case GTK_SCROLL_PAGE_UP:
1194       scroll = GTK_SCROLL_PAGE_BACKWARD;
1195       horizontal = FALSE;
1196       break;
1197     case GTK_SCROLL_PAGE_DOWN:
1198       scroll = GTK_SCROLL_PAGE_FORWARD;
1199       horizontal = FALSE;
1200       break;
1201     case GTK_SCROLL_PAGE_LEFT:
1202       scroll = GTK_SCROLL_STEP_BACKWARD;
1203       horizontal = TRUE;
1204       break;
1205     case GTK_SCROLL_PAGE_RIGHT:
1206       scroll = GTK_SCROLL_STEP_FORWARD;
1207       horizontal = TRUE;
1208       break;
1209     case GTK_SCROLL_STEP_BACKWARD:
1210     case GTK_SCROLL_STEP_FORWARD:
1211     case GTK_SCROLL_PAGE_BACKWARD:
1212     case GTK_SCROLL_PAGE_FORWARD:
1213     case GTK_SCROLL_START:
1214     case GTK_SCROLL_END:
1215       break;
1216     default:
1217       g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
1218       return FALSE;
1219     }
1220
1221   if ((horizontal && (!priv->hscrollbar || !priv->hscrollbar_visible)) ||
1222       (!horizontal && (!priv->vscrollbar || !priv->vscrollbar_visible)))
1223     return FALSE;
1224
1225   if (horizontal)
1226     {
1227       if (priv->hscrollbar)
1228         adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
1229     }
1230   else
1231     {
1232       if (priv->vscrollbar)
1233         adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
1234     }
1235
1236   if (adjustment)
1237     {
1238       gdouble value = adjustment->value;
1239
1240       switch (scroll)
1241         {
1242         case GTK_SCROLL_STEP_FORWARD:
1243           value += adjustment->step_increment;
1244           break;
1245         case GTK_SCROLL_STEP_BACKWARD:
1246           value -= adjustment->step_increment;
1247           break;
1248         case GTK_SCROLL_PAGE_FORWARD:
1249           value += adjustment->page_increment;
1250           break;
1251         case GTK_SCROLL_PAGE_BACKWARD:
1252           value -= adjustment->page_increment;
1253           break;
1254         case GTK_SCROLL_START:
1255           value = adjustment->lower;
1256           break;
1257         case GTK_SCROLL_END:
1258           value = adjustment->upper;
1259           break;
1260         default:
1261           g_assert_not_reached ();
1262           break;
1263         }
1264
1265       gtk_adjustment_set_value (adjustment, value);
1266
1267       return TRUE;
1268     }
1269
1270   return FALSE;
1271 }
1272
1273 static void
1274 gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
1275                                     GtkDirectionType   direction_type)
1276 {
1277   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1278   GtkWidget *toplevel;
1279
1280   /* Focus out of the scrolled window entirely. We do this by setting
1281    * a flag, then propagating the focus motion to the notebook.
1282    */
1283   toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window));
1284   if (!gtk_widget_is_toplevel (toplevel))
1285     return;
1286
1287   g_object_ref (scrolled_window);
1288
1289   priv->focus_out = TRUE;
1290   g_signal_emit_by_name (toplevel, "move-focus", direction_type);
1291   priv->focus_out = FALSE;
1292
1293   g_object_unref (scrolled_window);
1294 }
1295
1296 static void
1297 gtk_scrolled_window_relative_allocation (GtkWidget     *widget,
1298                                          GtkAllocation *allocation)
1299 {
1300   GtkAllocation widget_allocation;
1301   GtkScrolledWindow *scrolled_window;
1302   GtkScrolledWindowPrivate *priv;
1303   GtkStyle *style;
1304   gint scrollbar_spacing;
1305   guint border_width;
1306
1307   g_return_if_fail (widget != NULL);
1308   g_return_if_fail (allocation != NULL);
1309
1310   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1311   priv = scrolled_window->priv;
1312
1313   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1314
1315   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
1316   allocation->x = border_width;
1317   allocation->y = border_width;
1318
1319   if (priv->shadow_type != GTK_SHADOW_NONE)
1320     {
1321       style = gtk_widget_get_style (widget);
1322       allocation->x += style->xthickness;
1323       allocation->y += style->ythickness;
1324     }
1325
1326   gtk_widget_get_allocation (widget, &widget_allocation);
1327   allocation->width = MAX (1, (gint) widget_allocation.width - allocation->x * 2);
1328   allocation->height = MAX (1, (gint) widget_allocation.height - allocation->y * 2);
1329
1330   if (priv->vscrollbar_visible)
1331     {
1332       GtkRequisition vscrollbar_requisition;
1333       gboolean is_rtl;
1334
1335       gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->vscrollbar),
1336                                  &vscrollbar_requisition, NULL);
1337       is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
1338
1339       if ((!is_rtl &&
1340            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1341             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1342           (is_rtl &&
1343            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1344             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1345         allocation->x += (vscrollbar_requisition.width +  scrollbar_spacing);
1346
1347       allocation->width = MAX (1, allocation->width - (vscrollbar_requisition.width + scrollbar_spacing));
1348     }
1349   if (priv->hscrollbar_visible)
1350     {
1351       GtkRequisition hscrollbar_requisition;
1352
1353       gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->hscrollbar),
1354                                  &hscrollbar_requisition, NULL);
1355
1356       if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
1357           priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)
1358         allocation->y += (hscrollbar_requisition.height + scrollbar_spacing);
1359
1360       allocation->height = MAX (1, allocation->height - (hscrollbar_requisition.height + scrollbar_spacing));
1361     }
1362 }
1363
1364 static void
1365 gtk_scrolled_window_size_allocate (GtkWidget     *widget,
1366                                    GtkAllocation *allocation)
1367 {
1368   GtkScrolledWindow *scrolled_window;
1369   GtkScrolledWindowPrivate *priv;
1370   GtkStyle *style;
1371   GtkBin *bin;
1372   GtkAllocation relative_allocation;
1373   GtkAllocation child_allocation;
1374   GtkWidget *child;
1375   gboolean scrollbars_within_bevel;
1376   gint scrollbar_spacing;
1377   guint border_width;
1378
1379   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
1380   g_return_if_fail (allocation != NULL);
1381
1382   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1383   bin = GTK_BIN (scrolled_window);
1384   priv = scrolled_window->priv;
1385
1386   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1387
1388   style = gtk_widget_get_style (widget);
1389   gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
1390
1391   border_width = gtk_container_get_border_width (GTK_CONTAINER (scrolled_window));
1392
1393   gtk_widget_set_allocation (widget, allocation);
1394
1395   if (priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
1396     priv->hscrollbar_visible = TRUE;
1397   else if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
1398     priv->hscrollbar_visible = FALSE;
1399   if (priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
1400     priv->vscrollbar_visible = TRUE;
1401   else if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
1402     priv->vscrollbar_visible = FALSE;
1403
1404   child = gtk_bin_get_child (bin);
1405   if (child && gtk_widget_get_visible (child))
1406     {
1407       gboolean previous_hvis;
1408       gboolean previous_vvis;
1409       guint count = 0;
1410
1411       do
1412         {
1413           gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1414
1415           child_allocation.x = relative_allocation.x + allocation->x;
1416           child_allocation.y = relative_allocation.y + allocation->y;
1417           child_allocation.width = relative_allocation.width;
1418           child_allocation.height = relative_allocation.height;
1419
1420           previous_hvis = priv->hscrollbar_visible;
1421           previous_vvis = priv->vscrollbar_visible;
1422
1423           gtk_widget_size_allocate (child, &child_allocation);
1424
1425           /* If, after the first iteration, the hscrollbar and the
1426            * vscrollbar flip visiblity, then we need both.
1427            */
1428           if (count &&
1429               previous_hvis != priv->hscrollbar_visible &&
1430               previous_vvis != priv->vscrollbar_visible)
1431             {
1432               priv->hscrollbar_visible = TRUE;
1433               priv->vscrollbar_visible = TRUE;
1434
1435               /* a new resize is already queued at this point,
1436                * so we will immediatedly get reinvoked
1437                */
1438               return;
1439             }
1440
1441           count++;
1442         }
1443       while (previous_hvis != priv->hscrollbar_visible ||
1444              previous_vvis != priv->vscrollbar_visible);
1445     }
1446   else
1447     {
1448       priv->hscrollbar_visible = priv->hscrollbar_policy == GTK_POLICY_ALWAYS;
1449       priv->vscrollbar_visible = priv->vscrollbar_policy == GTK_POLICY_ALWAYS;
1450       gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
1451     }
1452
1453   if (priv->hscrollbar_visible)
1454     {
1455       GtkRequisition hscrollbar_requisition;
1456
1457       gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->hscrollbar),
1458                                  &hscrollbar_requisition, NULL);
1459
1460       if (!gtk_widget_get_visible (priv->hscrollbar))
1461         gtk_widget_show (priv->hscrollbar);
1462
1463       child_allocation.x = relative_allocation.x;
1464       if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1465           priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
1466         child_allocation.y = (relative_allocation.y +
1467                               relative_allocation.height +
1468                               scrollbar_spacing +
1469                               (priv->shadow_type == GTK_SHADOW_NONE ?
1470                                0 : style->ythickness));
1471       else
1472         child_allocation.y = border_width;
1473
1474       child_allocation.width = relative_allocation.width;
1475       child_allocation.height = hscrollbar_requisition.height;
1476       child_allocation.x += allocation->x;
1477       child_allocation.y += allocation->y;
1478
1479       if (priv->shadow_type != GTK_SHADOW_NONE)
1480         {
1481           if (!scrollbars_within_bevel)
1482             {
1483               child_allocation.x -= style->xthickness;
1484               child_allocation.width += 2 * style->xthickness;
1485             }
1486           else if (GTK_CORNER_TOP_RIGHT == priv->real_window_placement ||
1487                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1488             {
1489               child_allocation.y -= style->ythickness;
1490             }
1491           else
1492             {
1493               child_allocation.y += style->ythickness;
1494             }
1495         }
1496
1497       gtk_widget_size_allocate (priv->hscrollbar, &child_allocation);
1498     }
1499   else if (gtk_widget_get_visible (priv->hscrollbar))
1500     gtk_widget_hide (priv->hscrollbar);
1501
1502   if (priv->vscrollbar_visible)
1503     {
1504       GtkRequisition vscrollbar_requisition;
1505       if (!gtk_widget_get_visible (priv->vscrollbar))
1506         gtk_widget_show (priv->vscrollbar);
1507
1508       gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->vscrollbar),
1509                                  &vscrollbar_requisition, NULL);
1510
1511       if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
1512            (priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
1513             priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
1514           (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
1515            (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
1516             priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
1517         child_allocation.x = (relative_allocation.x +
1518                               relative_allocation.width +
1519                               scrollbar_spacing +
1520                               (priv->shadow_type == GTK_SHADOW_NONE ?
1521                                0 : style->xthickness));
1522       else
1523         child_allocation.x = border_width;
1524
1525       child_allocation.y = relative_allocation.y;
1526       child_allocation.width = vscrollbar_requisition.width;
1527       child_allocation.height = relative_allocation.height;
1528       child_allocation.x += allocation->x;
1529       child_allocation.y += allocation->y;
1530
1531       if (priv->shadow_type != GTK_SHADOW_NONE)
1532         {
1533           if (!scrollbars_within_bevel)
1534             {
1535               child_allocation.y -= style->ythickness;
1536               child_allocation.height += 2 * style->ythickness;
1537             }
1538           else if (GTK_CORNER_BOTTOM_LEFT == priv->real_window_placement ||
1539                    GTK_CORNER_TOP_LEFT == priv->real_window_placement)
1540             {
1541               child_allocation.x -= style->xthickness;
1542             }
1543           else
1544             {
1545               child_allocation.x += style->xthickness;
1546             }
1547         }
1548
1549       gtk_widget_size_allocate (priv->vscrollbar, &child_allocation);
1550     }
1551   else if (gtk_widget_get_visible (priv->vscrollbar))
1552     gtk_widget_hide (priv->vscrollbar);
1553 }
1554
1555 static gboolean
1556 gtk_scrolled_window_scroll_event (GtkWidget      *widget,
1557                                   GdkEventScroll *event)
1558 {
1559   GtkScrolledWindowPrivate *priv;
1560   GtkScrolledWindow *scrolled_window;
1561   GtkWidget *range;
1562
1563   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
1564   g_return_val_if_fail (event != NULL, FALSE);
1565
1566   scrolled_window = GTK_SCROLLED_WINDOW (widget);
1567   priv = scrolled_window->priv;
1568
1569   if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
1570     range = priv->vscrollbar;
1571   else
1572     range = priv->hscrollbar;
1573
1574   if (range && gtk_widget_get_visible (range))
1575     {
1576       GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range));
1577       gdouble delta;
1578
1579       delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event->direction);
1580
1581       gtk_adjustment_set_value (adj, adj->value + delta);
1582
1583       return TRUE;
1584     }
1585
1586   return FALSE;
1587 }
1588
1589 static gboolean
1590 gtk_scrolled_window_focus (GtkWidget        *widget,
1591                            GtkDirectionType  direction)
1592 {
1593   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1594   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1595   GtkWidget *child;
1596   gboolean had_focus_child;
1597
1598   had_focus_child = gtk_container_get_focus_child (GTK_CONTAINER (widget)) != NULL;
1599
1600   if (priv->focus_out)
1601     {
1602       priv->focus_out = FALSE; /* Clear this to catch the wrap-around case */
1603       return FALSE;
1604     }
1605
1606   if (gtk_widget_is_focus (widget))
1607     return FALSE;
1608
1609   /* We only put the scrolled window itself in the focus chain if it
1610    * isn't possible to focus any children.
1611    */
1612   child = gtk_bin_get_child (GTK_BIN (widget));
1613   if (child)
1614     {
1615       if (gtk_widget_child_focus (child, direction))
1616         return TRUE;
1617     }
1618
1619   if (!had_focus_child && gtk_widget_get_can_focus (widget))
1620     {
1621       gtk_widget_grab_focus (widget);
1622       return TRUE;
1623     }
1624   else
1625     return FALSE;
1626 }
1627
1628 static void
1629 gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
1630                                         gpointer       data)
1631 {
1632   GtkScrolledWindowPrivate *priv;;
1633   GtkScrolledWindow *scrolled_window;
1634
1635   g_return_if_fail (adjustment != NULL);
1636   g_return_if_fail (data != NULL);
1637
1638   scrolled_window = GTK_SCROLLED_WINDOW (data);
1639   priv = scrolled_window->priv;
1640
1641   if (priv->hscrollbar &&
1642       adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
1643     {
1644       if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
1645         {
1646           gboolean visible;
1647
1648           visible = priv->hscrollbar_visible;
1649           priv->hscrollbar_visible = (adjustment->upper - adjustment->lower >
1650                                               adjustment->page_size);
1651           if (priv->hscrollbar_visible != visible)
1652             gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
1653         }
1654     }
1655   else if (priv->vscrollbar &&
1656            adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
1657     {
1658       if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
1659         {
1660           gboolean visible;
1661
1662           visible = priv->vscrollbar_visible;
1663           priv->vscrollbar_visible = (adjustment->upper - adjustment->lower >
1664                                               adjustment->page_size);
1665           if (priv->vscrollbar_visible != visible)
1666             gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
1667         }
1668     }
1669 }
1670
1671 static void
1672 gtk_scrolled_window_add (GtkContainer *container,
1673                          GtkWidget    *child)
1674 {
1675   GtkScrolledWindowPrivate *priv;
1676   GtkScrolledWindow *scrolled_window;
1677   GtkBin *bin;
1678   GtkWidget *child_widget;
1679
1680   bin = GTK_BIN (container);
1681   child_widget = gtk_bin_get_child (bin);
1682   g_return_if_fail (child_widget == NULL);
1683
1684   scrolled_window = GTK_SCROLLED_WINDOW (container);
1685   priv = scrolled_window->priv;
1686
1687   _gtk_bin_set_child (bin, child);
1688   gtk_widget_set_parent (child, GTK_WIDGET (bin));
1689
1690   /* this is a temporary message */
1691   if (!gtk_widget_set_scroll_adjustments (child,
1692                                           gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
1693                                           gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar))))
1694     g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
1695                "use gtk_scrolled_window_add_with_viewport() instead");
1696 }
1697
1698 static void
1699 gtk_scrolled_window_remove (GtkContainer *container,
1700                             GtkWidget    *child)
1701 {
1702   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
1703   g_return_if_fail (child != NULL);
1704   g_return_if_fail (gtk_bin_get_child (GTK_BIN (container)) == child);
1705
1706   gtk_widget_set_scroll_adjustments (child, NULL, NULL);
1707
1708   /* chain parent class handler to remove child */
1709   GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
1710 }
1711
1712 /**
1713  * gtk_scrolled_window_add_with_viewport:
1714  * @scrolled_window: a #GtkScrolledWindow
1715  * @child: the widget you want to scroll
1716  *
1717  * Used to add children without native scrolling capabilities. This
1718  * is simply a convenience function; it is equivalent to adding the
1719  * unscrollable child to a viewport, then adding the viewport to the
1720  * scrolled window. If a child has native scrolling, use
1721  * gtk_container_add() instead of this function.
1722  *
1723  * The viewport scrolls the child by moving its #GdkWindow, and takes
1724  * the size of the child to be the size of its toplevel #GdkWindow.
1725  * This will be very wrong for most widgets that support native scrolling;
1726  * for example, if you add a widget such as #GtkTreeView with a viewport,
1727  * the whole widget will scroll, including the column headings. Thus,
1728  * widgets with native scrolling support should not be used with the
1729  * #GtkViewport proxy.
1730  *
1731  * A widget supports scrolling natively if the
1732  * set_scroll_adjustments_signal field in #GtkWidgetClass is non-zero,
1733  * i.e. has been filled in with a valid signal identifier.
1734  */
1735 void
1736 gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
1737                                        GtkWidget         *child)
1738 {
1739   GtkBin *bin;
1740   GtkWidget *viewport;
1741   GtkWidget *child_widget;
1742
1743   g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
1744   g_return_if_fail (GTK_IS_WIDGET (child));
1745   g_return_if_fail (gtk_widget_get_parent (child) == NULL);
1746
1747   bin = GTK_BIN (scrolled_window);
1748   child_widget = gtk_bin_get_child (bin);
1749
1750   if (child_widget)
1751     {
1752       g_return_if_fail (GTK_IS_VIEWPORT (child_widget));
1753       g_return_if_fail (gtk_bin_get_child (GTK_BIN (child_widget)) == NULL);
1754
1755       viewport = child_widget;
1756     }
1757   else
1758     {
1759       viewport =
1760         gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
1761                           gtk_scrolled_window_get_vadjustment (scrolled_window));
1762       gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
1763     }
1764
1765   gtk_widget_show (viewport);
1766   gtk_container_add (GTK_CONTAINER (viewport), child);
1767 }
1768
1769 /*
1770  * _gtk_scrolled_window_get_spacing:
1771  * @scrolled_window: a scrolled window
1772  *
1773  * Gets the spacing between the scrolled window's scrollbars and
1774  * the scrolled widget. Used by GtkCombo
1775  *
1776  * Return value: the spacing, in pixels.
1777  */
1778 gint
1779 _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
1780 {
1781   GtkScrolledWindowClass *class;
1782
1783   g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
1784
1785   class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
1786
1787   if (class->scrollbar_spacing >= 0)
1788     return class->scrollbar_spacing;
1789   else
1790     {
1791       gint scrollbar_spacing;
1792
1793       gtk_widget_style_get (GTK_WIDGET (scrolled_window),
1794                             "scrollbar-spacing", &scrollbar_spacing,
1795                             NULL);
1796
1797       return scrollbar_spacing;
1798     }
1799 }
1800
1801
1802 static void
1803 gtk_scrolled_window_size_request_init (GtkSizeRequestIface *iface)
1804 {
1805   iface->get_width            = gtk_scrolled_window_get_width;
1806   iface->get_height           = gtk_scrolled_window_get_height;
1807   iface->get_height_for_width = gtk_scrolled_window_get_height_for_width;
1808   iface->get_width_for_height = gtk_scrolled_window_get_width_for_height;
1809 }
1810
1811 static void
1812 gtk_scrolled_window_get_size (GtkSizeRequest *widget,
1813                               GtkOrientation  orientation,
1814                               gint           *minimum_size,
1815                               gint           *natural_size)
1816 {
1817   GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
1818   GtkScrolledWindowPrivate *priv = scrolled_window->priv;
1819   GtkBin *bin = GTK_BIN (scrolled_window);
1820   gint extra_width;
1821   gint extra_height;
1822   gint scrollbar_spacing;
1823   GtkRequisition hscrollbar_requisition;
1824   GtkRequisition vscrollbar_requisition;
1825   GtkRequisition minimum_req, natural_req;
1826   GtkStyle *style;
1827   GtkWidget *child;
1828   gint min_child_size, nat_child_size;
1829   guint border_width;
1830
1831   scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
1832
1833   extra_width = 0;
1834   extra_height = 0;
1835   minimum_req.width = 0;
1836   minimum_req.height = 0;
1837   natural_req.width = 0;
1838   natural_req.height = 0;
1839
1840   gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->hscrollbar),
1841                              &hscrollbar_requisition, NULL);
1842   gtk_size_request_get_size (GTK_SIZE_REQUEST (priv->vscrollbar),
1843                              &vscrollbar_requisition, NULL);
1844
1845   child = gtk_bin_get_child (bin);
1846   if (child && gtk_widget_get_visible (child))
1847     {
1848       if (orientation == GTK_ORIENTATION_HORIZONTAL)
1849         {
1850           gtk_size_request_get_width (GTK_SIZE_REQUEST (child),
1851                                       &min_child_size,
1852                                       &nat_child_size);
1853
1854           if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
1855             {
1856               minimum_req.width += min_child_size;
1857               natural_req.width += nat_child_size;
1858             }
1859           else
1860             {
1861               GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (child, FALSE);
1862
1863               if (aux_info && aux_info->width > 0)
1864                 {
1865                   minimum_req.width += aux_info->width;
1866                   natural_req.width += aux_info->width;
1867                   extra_width = -1;
1868                 }
1869               else
1870                 {
1871                   minimum_req.width += vscrollbar_requisition.width;
1872                   natural_req.width += vscrollbar_requisition.width;
1873                 }
1874             }
1875         }
1876       else /* GTK_ORIENTATION_VERTICAL */
1877         {
1878           gtk_size_request_get_height (GTK_SIZE_REQUEST (child),
1879                                        &min_child_size,
1880                                        &nat_child_size);
1881
1882           if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
1883             {
1884               minimum_req.height += min_child_size;
1885               natural_req.height += nat_child_size;
1886             }
1887           else
1888             {
1889               GtkWidgetAuxInfo *aux_info = _gtk_widget_get_aux_info (child, FALSE);
1890
1891               if (aux_info && aux_info->height > 0)
1892                 {
1893                   minimum_req.height += aux_info->height;
1894                   natural_req.height += aux_info->height;
1895                   extra_height = -1;
1896                 }
1897               else
1898                 {
1899                   minimum_req.height += hscrollbar_requisition.height;
1900                   natural_req.height += hscrollbar_requisition.height;
1901                 }
1902             }
1903         }
1904     }
1905
1906   if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1907       priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
1908     {
1909       minimum_req.width = MAX (minimum_req.width, hscrollbar_requisition.width);
1910       natural_req.width = MAX (natural_req.width, hscrollbar_requisition.width);
1911       if (!extra_height || priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
1912         extra_height = scrollbar_spacing + hscrollbar_requisition.height;
1913     }
1914
1915   if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
1916       priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
1917     {
1918       minimum_req.height = MAX (minimum_req.height, vscrollbar_requisition.height);
1919       natural_req.height = MAX (natural_req.height, vscrollbar_requisition.height);
1920       if (!extra_height || priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
1921         extra_width = scrollbar_spacing + vscrollbar_requisition.width;
1922     }
1923
1924   border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
1925   minimum_req.width += border_width * 2 + MAX (0, extra_width);
1926   minimum_req.height += border_width * 2 + MAX (0, extra_height);
1927   natural_req.width += border_width * 2 + MAX (0, extra_width);
1928   natural_req.height += border_width * 2 + MAX (0, extra_height);
1929
1930   if (priv->shadow_type != GTK_SHADOW_NONE)
1931     {
1932       style = gtk_widget_get_style (GTK_WIDGET (widget));
1933       minimum_req.width += 2 * style->xthickness;
1934       minimum_req.height += 2 * style->ythickness;
1935       natural_req.width += 2 * style->xthickness;
1936       natural_req.height += 2 * style->ythickness;
1937     }
1938
1939   if (orientation == GTK_ORIENTATION_HORIZONTAL)
1940     {
1941       if (minimum_size)
1942         *minimum_size = minimum_req.width;
1943       if (natural_size)
1944         *natural_size = natural_req.width;
1945     }
1946   else
1947     {
1948       if (minimum_size)
1949         *minimum_size = minimum_req.height;
1950       if (natural_size)
1951         *natural_size = natural_req.height;
1952     }
1953 }
1954
1955 static void
1956 gtk_scrolled_window_get_width (GtkSizeRequest      *widget,
1957                                gint                   *minimum_size,
1958                                gint                   *natural_size)
1959 {
1960   gtk_scrolled_window_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
1961 }
1962
1963 static void
1964 gtk_scrolled_window_get_height (GtkSizeRequest      *widget,
1965                                 gint                *minimum_size,
1966                                 gint                *natural_size)
1967 {
1968   gtk_scrolled_window_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
1969 }
1970
1971 static void
1972 gtk_scrolled_window_get_height_for_width (GtkSizeRequest *widget,
1973                                           gint            width,
1974                                           gint           *minimum_height,
1975                                           gint           *natural_height)
1976 {
1977   g_return_if_fail (GTK_IS_WIDGET (widget));
1978
1979   GTK_SIZE_REQUEST_GET_IFACE (widget)->get_height (widget, minimum_height, natural_height);
1980 }
1981
1982 static void
1983 gtk_scrolled_window_get_width_for_height (GtkSizeRequest *widget,
1984                                           gint       height,
1985                                           gint      *minimum_width,
1986                                           gint      *natural_width)
1987 {
1988   g_return_if_fail (GTK_IS_WIDGET (widget));
1989
1990   GTK_SIZE_REQUEST_GET_IFACE (widget)->get_width (widget, minimum_width, natural_width);
1991 }