Pileus Git - ~andy/gtk/blob - gtk/gtkcontainer.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 <stdarg.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31
  32 #include "gtkcontainer.h"
  33 #include "gtkbuildable.h"
  34 #include "gtkbuilderprivate.h"
  35 #include "gtkprivate.h"
  36 #include "gtkmain.h"
  37 #include "gtkmarshalers.h"
  38 #include "gtkwindow.h"
  39 #include "gtkintl.h"
  40 #include "gtktoolbar.h"
  41 #include <gobject/gobjectnotifyqueue.c>
  42 #include <gobject/gvaluecollector.h>
  43
  44 struct _GtkContainerPrivate
  45 {
  46   GtkWidget *focus_child;
  47
  48   guint border_width : 16;
  49
  50   guint has_focus_chain    : 1;
  51   guint need_resize        : 1;
  52   guint reallocate_redraws : 1;
  53   guint resize_mode        : 2;
  54 };
  55
  56 enum {
  57   ADD,
  58   REMOVE,
  59   CHECK_RESIZE,
  60   SET_FOCUS_CHILD,
  61   LAST_SIGNAL
  62 };
  63
  64 enum {
  65   PROP_0,
  66   PROP_BORDER_WIDTH,
  67   PROP_RESIZE_MODE,
  68   PROP_CHILD
  69 };
  70
  71 #define PARAM_SPEC_PARAM_ID(pspec)              ((pspec)->param_id)
  72 #define PARAM_SPEC_SET_PARAM_ID(pspec, id)      ((pspec)->param_id = (id))
  73
  74
  75 /* --- prototypes --- */
  76 static void     gtk_container_base_class_init      (GtkContainerClass *klass);
  77 static void     gtk_container_base_class_finalize  (GtkContainerClass *klass);
  78 static void     gtk_container_class_init           (GtkContainerClass *klass);
  79 static void     gtk_container_init                 (GtkContainer      *container);
  80 static void     gtk_container_destroy              (GtkObject         *object);
  81 static void     gtk_container_set_property         (GObject         *object,
  82                                                     guint            prop_id,
  83                                                     const GValue    *value,
  84                                                     GParamSpec      *pspec);
  85 static void     gtk_container_get_property         (GObject         *object,
  86                                                     guint            prop_id,
  87                                                     GValue          *value,
  88                                                     GParamSpec      *pspec);
  89 static void     gtk_container_add_unimplemented    (GtkContainer      *container,
  90                                                     GtkWidget         *widget);
  91 static void     gtk_container_remove_unimplemented (GtkContainer      *container,
  92                                                     GtkWidget         *widget);
  93 static void     gtk_container_real_check_resize    (GtkContainer      *container);
  94 static gboolean gtk_container_focus                (GtkWidget         *widget,
  95                                                     GtkDirectionType   direction);
  96 static void     gtk_container_real_set_focus_child (GtkContainer      *container,
  97                                                     GtkWidget         *widget);
  98
  99 static gboolean gtk_container_focus_move           (GtkContainer      *container,
 100                                                     GList             *children,
 101                                                     GtkDirectionType   direction);
 102 static void     gtk_container_children_callback    (GtkWidget         *widget,
 103                                                     gpointer           client_data);
 104 static void     gtk_container_show_all             (GtkWidget         *widget);
 105 static void     gtk_container_hide_all             (GtkWidget         *widget);
 106 static gint     gtk_container_expose               (GtkWidget         *widget,
 107                                                     GdkEventExpose    *event);
 108 static void     gtk_container_map                  (GtkWidget         *widget);
 109 static void     gtk_container_unmap                (GtkWidget         *widget);
 110
 111 static gchar* gtk_container_child_default_composite_name (GtkContainer *container,
 112                                                           GtkWidget    *child);
 113
 114 /* GtkBuildable */
 115 static void gtk_container_buildable_init           (GtkBuildableIface *iface);
 116 static void gtk_container_buildable_add_child      (GtkBuildable *buildable,
 117                                                     GtkBuilder   *builder,
 118                                                     GObject      *child,
 119                                                     const gchar  *type);
 120 static gboolean gtk_container_buildable_custom_tag_start (GtkBuildable  *buildable,
 121                                                           GtkBuilder    *builder,
 122                                                           GObject       *child,
 123                                                           const gchar   *tagname,
 124                                                           GMarkupParser *parser,
 125                                                           gpointer      *data);
 126 static void    gtk_container_buildable_custom_tag_end (GtkBuildable *buildable,
 127                                                        GtkBuilder   *builder,
 128                                                        GObject      *child,
 129                                                        const gchar  *tagname,
 130                                                        gpointer     *data);
 131
 132
 133 /* --- variables --- */
 134 static const gchar           vadjustment_key[] = "gtk-vadjustment";
 135 static guint                 vadjustment_key_id = 0;
 136 static const gchar           hadjustment_key[] = "gtk-hadjustment";
 137 static guint                 hadjustment_key_id = 0;
 138 static GSList               *container_resize_queue = NULL;
 139 static guint                 container_signals[LAST_SIGNAL] = { 0 };
 140 static GtkWidgetClass       *parent_class = NULL;
 141 extern GParamSpecPool       *_gtk_widget_child_property_pool;
 142 extern GObjectNotifyContext *_gtk_widget_child_property_notify_context;
 143 static GtkBuildableIface    *parent_buildable_iface;
 144
 145
 146 /* --- functions --- */
 147 GType
 148 gtk_container_get_type (void)
 149 {
 150   static GType container_type = 0;
 151
 152   if (!container_type)
 153     {
 154       const GTypeInfo container_info =
 155       {
 156         sizeof (GtkContainerClass),
 157         (GBaseInitFunc) gtk_container_base_class_init,
 158         (GBaseFinalizeFunc) gtk_container_base_class_finalize,
 159         (GClassInitFunc) gtk_container_class_init,
 160         NULL        /* class_finalize */,
 161         NULL        /* class_data */,
 162         sizeof (GtkContainer),
 163         0           /* n_preallocs */,
 164         (GInstanceInitFunc) gtk_container_init,
 165         NULL,       /* value_table */
 166       };
 167
 168       const GInterfaceInfo buildable_info =
 169       {
 170         (GInterfaceInitFunc) gtk_container_buildable_init,
 171         NULL,
 172         NULL
 173       };
 174
 175       container_type =
 176         g_type_register_static (GTK_TYPE_WIDGET, I_("GtkContainer"),
 177                                 &container_info, G_TYPE_FLAG_ABSTRACT);
 178
 179       g_type_add_interface_static (container_type,
 180                                    GTK_TYPE_BUILDABLE,
 181                                    &buildable_info);
 182
 183     }
 184
 185   return container_type;
 186 }
 187
 188 static void
 189 gtk_container_base_class_init (GtkContainerClass *class)
 190 {
 191   /* reset instance specifc class fields that don't get inherited */
 192   class->set_child_property = NULL;
 193   class->get_child_property = NULL;
 194 }
 195
 196 static void
 197 gtk_container_base_class_finalize (GtkContainerClass *class)
 198 {
 199   GList *list, *node;
 200
 201   list = g_param_spec_pool_list_owned (_gtk_widget_child_property_pool, G_OBJECT_CLASS_TYPE (class));
 202   for (node = list; node; node = node->next)
 203     {
 204       GParamSpec *pspec = node->data;
 205
 206       g_param_spec_pool_remove (_gtk_widget_child_property_pool, pspec);
 207       PARAM_SPEC_SET_PARAM_ID (pspec, 0);
 208       g_param_spec_unref (pspec);
 209     }
 210   g_list_free (list);
 211 }
 212
 213 static void
 214 gtk_container_class_init (GtkContainerClass *class)
 215 {
 216   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 217   GtkObjectClass *object_class = GTK_OBJECT_CLASS (class);
 218   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 219
 220   parent_class = g_type_class_peek_parent (class);
 221
 222   vadjustment_key_id = g_quark_from_static_string (vadjustment_key);
 223   hadjustment_key_id = g_quark_from_static_string (hadjustment_key);
 224
 225   gobject_class->set_property = gtk_container_set_property;
 226   gobject_class->get_property = gtk_container_get_property;
 227
 228   object_class->destroy = gtk_container_destroy;
 229
 230   widget_class->show_all = gtk_container_show_all;
 231   widget_class->hide_all = gtk_container_hide_all;
 232   widget_class->expose_event = gtk_container_expose;
 233   widget_class->map = gtk_container_map;
 234   widget_class->unmap = gtk_container_unmap;
 235   widget_class->focus = gtk_container_focus;
 236
 237   class->add = gtk_container_add_unimplemented;
 238   class->remove = gtk_container_remove_unimplemented;
 239   class->check_resize = gtk_container_real_check_resize;
 240   class->forall = NULL;
 241   class->set_focus_child = gtk_container_real_set_focus_child;
 242   class->child_type = NULL;
 243   class->composite_name = gtk_container_child_default_composite_name;
 244
 245   g_object_class_install_property (gobject_class,
 246                                    PROP_RESIZE_MODE,
 247                                    g_param_spec_enum ("resize-mode",
 248                                                       P_("Resize mode"),
 249                                                       P_("Specify how resize events are handled"),
 250                                                       GTK_TYPE_RESIZE_MODE,
 251                                                       GTK_RESIZE_PARENT,
 252                                                       GTK_PARAM_READWRITE));
 253   g_object_class_install_property (gobject_class,
 254                                    PROP_BORDER_WIDTH,
 255                                    g_param_spec_uint ("border-width",
 256                                                       P_("Border width"),
 257                                                       P_("The width of the empty border outside the containers children"),
 258                                                       0,
 259                                                       65535,
 260                                                       0,
 261                                                       GTK_PARAM_READWRITE));
 262   g_object_class_install_property (gobject_class,
 263                                    PROP_CHILD,
 264                                    g_param_spec_object ("child",
 265                                                       P_("Child"),
 266                                                       P_("Can be used to add a new child to the container"),
 267                                                       GTK_TYPE_WIDGET,
 268                                                       GTK_PARAM_WRITABLE));
 269   container_signals[ADD] =
 270     g_signal_new (I_("add"),
 271                   G_OBJECT_CLASS_TYPE (object_class),
 272                   G_SIGNAL_RUN_FIRST,
 273                   G_STRUCT_OFFSET (GtkContainerClass, add),
 274                   NULL, NULL,
 275                   _gtk_marshal_VOID__OBJECT,
 276                   G_TYPE_NONE, 1,
 277                   GTK_TYPE_WIDGET);
 278   container_signals[REMOVE] =
 279     g_signal_new (I_("remove"),
 280                   G_OBJECT_CLASS_TYPE (object_class),
 281                   G_SIGNAL_RUN_FIRST,
 282                   G_STRUCT_OFFSET (GtkContainerClass, remove),
 283                   NULL, NULL,
 284                   _gtk_marshal_VOID__OBJECT,
 285                   G_TYPE_NONE, 1,
 286                   GTK_TYPE_WIDGET);
 287   container_signals[CHECK_RESIZE] =
 288     g_signal_new (I_("check-resize"),
 289                   G_OBJECT_CLASS_TYPE (object_class),
 290                   G_SIGNAL_RUN_LAST,
 291                   G_STRUCT_OFFSET (GtkContainerClass, check_resize),
 292                   NULL, NULL,
 293                   _gtk_marshal_VOID__VOID,
 294                   G_TYPE_NONE, 0);
 295   container_signals[SET_FOCUS_CHILD] =
 296     g_signal_new (I_("set-focus-child"),
 297                   G_OBJECT_CLASS_TYPE (object_class),
 298                   G_SIGNAL_RUN_FIRST,
 299                   G_STRUCT_OFFSET (GtkContainerClass, set_focus_child),
 300                   NULL, NULL,
 301                   _gtk_marshal_VOID__OBJECT,
 302                   G_TYPE_NONE, 1,
 303                   GTK_TYPE_WIDGET);
 304
 305   g_type_class_add_private (class, sizeof (GtkContainerPrivate));
 306 }
 307
 308 static void
 309 gtk_container_buildable_init (GtkBuildableIface *iface)
 310 {
 311   parent_buildable_iface = g_type_interface_peek_parent (iface);
 312   iface->add_child = gtk_container_buildable_add_child;
 313   iface->custom_tag_start = gtk_container_buildable_custom_tag_start;
 314   iface->custom_tag_end = gtk_container_buildable_custom_tag_end;
 315 }
 316
 317 static void
 318 gtk_container_buildable_add_child (GtkBuildable  *buildable,
 319                                    GtkBuilder    *builder,
 320                                    GObject       *child,
 321                                    const gchar   *type)
 322 {
 323   if (type)
 324     {
 325       GTK_BUILDER_WARN_INVALID_CHILD_TYPE (buildable, type);
 326     }
 327   else if (GTK_IS_WIDGET (child) &&
 328            gtk_widget_get_parent (GTK_WIDGET (child)) == NULL)
 329     {
 330       gtk_container_add (GTK_CONTAINER (buildable), GTK_WIDGET (child));
 331     }
 332   else
 333     g_warning ("Cannot add an object of type %s to a container of type %s",
 334                g_type_name (G_OBJECT_TYPE (child)), g_type_name (G_OBJECT_TYPE (buildable)));
 335 }
 336
 337 static void
 338 gtk_container_buildable_set_child_property (GtkContainer *container,
 339                                             GtkBuilder   *builder,
 340                                             GtkWidget    *child,
 341                                             gchar        *name,
 342                                             const gchar  *value)
 343 {
 344   GParamSpec *pspec;
 345   GValue gvalue = { 0, };
 346   GError *error = NULL;
 347
 348   pspec = gtk_container_class_find_child_property
 349     (G_OBJECT_GET_CLASS (container), name);
 350   if (!pspec)
 351     {
 352       g_warning ("%s does not have a property called %s",
 353                  g_type_name (G_OBJECT_TYPE (container)), name);
 354       return;
 355     }
 356
 357   if (!gtk_builder_value_from_string (builder, pspec, value, &gvalue, &error))
 358     {
 359       g_warning ("Could not read property %s:%s with value %s of type %s: %s",
 360                  g_type_name (G_OBJECT_TYPE (container)),
 361                  name,
 362                  value,
 363                  g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
 364                  error->message);
 365       g_error_free (error);
 366       return;
 367     }
 368
 369   gtk_container_child_set_property (container, child, name, &gvalue);
 370   g_value_unset (&gvalue);
 371 }
 372
 373 typedef struct {
 374   GtkBuilder   *builder;
 375   GtkContainer *container;
 376   GtkWidget    *child;
 377   gchar        *child_prop_name;
 378   gchar        *context;
 379   gboolean     translatable;
 380 } PackingPropertiesData;
 381
 382 static void
 383 attributes_start_element (GMarkupParseContext *context,
 384                           const gchar         *element_name,
 385                           const gchar        **names,
 386                           const gchar        **values,
 387                           gpointer             user_data,
 388                           GError             **error)
 389 {
 390   PackingPropertiesData *parser_data = (PackingPropertiesData*)user_data;
 391   guint i;
 392
 393   if (strcmp (element_name, "property") == 0)
 394     {
 395       for (i = 0; names[i]; i++)
 396         if (strcmp (names[i], "name") == 0)
 397           parser_data->child_prop_name = g_strdup (values[i]);
 398         else if (strcmp (names[i], "translatable") == 0)
 399           {
 400             if (!_gtk_builder_boolean_from_string (values[1],
 401                                                    &parser_data->translatable,
 402                                                    error))
 403               return;
 404           }
 405         else if (strcmp (names[i], "comments") == 0)
 406           ; /* for translators */
 407         else if (strcmp (names[i], "context") == 0)
 408           parser_data->context = g_strdup (values[1]);
 409         else
 410           g_warning ("Unsupported attribute for GtkContainer Child "
 411                      "property: %s\n", names[i]);
 412     }
 413   else if (strcmp (element_name, "packing") == 0)
 414     return;
 415   else
 416     g_warning ("Unsupported tag for GtkContainer: %s\n", element_name);
 417 }
 418
 419 static void
 420 attributes_text_element (GMarkupParseContext *context,
 421                          const gchar         *text,
 422                          gsize                text_len,
 423                          gpointer             user_data,
 424                          GError             **error)
 425 {
 426   PackingPropertiesData *parser_data = (PackingPropertiesData*)user_data;
 427   gchar* value;
 428
 429   if (!parser_data->child_prop_name)
 430     return;
 431
 432   if (parser_data->translatable && text_len)
 433     {
 434       const gchar* domain;
 435       domain = gtk_builder_get_translation_domain (parser_data->builder);
 436
 437       value = _gtk_builder_parser_translate (domain,
 438                                              parser_data->context,
 439                                              text);
 440     }
 441   else
 442     {
 443       value = g_strdup (text);
 444     }
 445
 446   gtk_container_buildable_set_child_property (parser_data->container,
 447                                               parser_data->builder,
 448                                               parser_data->child,
 449                                               parser_data->child_prop_name,
 450                                               value);
 451
 452   g_free (parser_data->child_prop_name);
 453   g_free (parser_data->context);
 454   g_free (value);
 455   parser_data->child_prop_name = NULL;
 456   parser_data->context = NULL;
 457   parser_data->translatable = FALSE;
 458 }
 459
 460 static const GMarkupParser attributes_parser =
 461   {
 462     attributes_start_element,
 463     NULL,
 464     attributes_text_element,
 465   };
 466
 467 static gboolean
 468 gtk_container_buildable_custom_tag_start (GtkBuildable  *buildable,
 469                                           GtkBuilder    *builder,
 470                                           GObject       *child,
 471                                           const gchar   *tagname,
 472                                           GMarkupParser *parser,
 473                                           gpointer      *data)
 474 {
 475   PackingPropertiesData *parser_data;
 476
 477   if (parent_buildable_iface->custom_tag_start (buildable, builder, child,
 478                                                 tagname, parser, data))
 479     return TRUE;
 480
 481   if (child && strcmp (tagname, "packing") == 0)
 482     {
 483       parser_data = g_slice_new0 (PackingPropertiesData);
 484       parser_data->builder = builder;
 485       parser_data->container = GTK_CONTAINER (buildable);
 486       parser_data->child = GTK_WIDGET (child);
 487       parser_data->child_prop_name = NULL;
 488
 489       *parser = attributes_parser;
 490       *data = parser_data;
 491       return TRUE;
 492     }
 493
 494   return FALSE;
 495 }
 496
 497 static void
 498 gtk_container_buildable_custom_tag_end (GtkBuildable *buildable,
 499                                         GtkBuilder   *builder,
 500                                         GObject      *child,
 501                                         const gchar  *tagname,
 502                                         gpointer     *data)
 503 {
 504   if (strcmp (tagname, "packing") == 0)
 505     {
 506       g_slice_free (PackingPropertiesData, (gpointer)data);
 507       return;
 508
 509     }
 510
 511   if (parent_buildable_iface->custom_tag_end)
 512     parent_buildable_iface->custom_tag_end (buildable, builder,
 513                                             child, tagname, data);
 514
 515 }
 516
 517 /**
 518  * gtk_container_child_type:
 519  * @container: a #GtkContainer
 520  *
 521  * Returns the type of the children supported by the container.
 522  *
 523  * Note that this may return %G_TYPE_NONE to indicate that no more
 524  * children can be added, e.g. for a #GtkPaned which already has two
 525  * children.
 526  *
 527  * Return value: a #GType.
 528  **/
 529 GType
 530 gtk_container_child_type (GtkContainer *container)
 531 {
 532   GType slot;
 533   GtkContainerClass *class;
 534
 535   g_return_val_if_fail (GTK_IS_CONTAINER (container), 0);
 536
 537   class = GTK_CONTAINER_GET_CLASS (container);
 538   if (class->child_type)
 539     slot = class->child_type (container);
 540   else
 541     slot = G_TYPE_NONE;
 542
 543   return slot;
 544 }
 545
 546 /* --- GtkContainer child property mechanism --- */
 547 static inline void
 548 container_get_child_property (GtkContainer *container,
 549                               GtkWidget    *child,
 550                               GParamSpec   *pspec,
 551                               GValue       *value)
 552 {
 553   GtkContainerClass *class = g_type_class_peek (pspec->owner_type);
 554
 555   class->get_child_property (container, child, PARAM_SPEC_PARAM_ID (pspec), value, pspec);
 556 }
 557
 558 static inline void
 559 container_set_child_property (GtkContainer       *container,
 560                               GtkWidget          *child,
 561                               GParamSpec         *pspec,
 562                               const GValue       *value,
 563                               GObjectNotifyQueue *nqueue)
 564 {
 565   GValue tmp_value = { 0, };
 566   GtkContainerClass *class = g_type_class_peek (pspec->owner_type);
 567
 568   /* provide a copy to work from, convert (if necessary) and validate */
 569   g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 570   if (!g_value_transform (value, &tmp_value))
 571     g_warning ("unable to set child property `%s' of type `%s' from value of type `%s'",
 572                pspec->name,
 573                g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
 574                G_VALUE_TYPE_NAME (value));
 575   else if (g_param_value_validate (pspec, &tmp_value) && !(pspec->flags & G_PARAM_LAX_VALIDATION))
 576     {
 577       gchar *contents = g_strdup_value_contents (value);
 578
 579       g_warning ("value \"%s\" of type `%s' is invalid for property `%s' of type `%s'",
 580                  contents,
 581                  G_VALUE_TYPE_NAME (value),
 582                  pspec->name,
 583                  g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
 584       g_free (contents);
 585     }
 586   else
 587     {
 588       class->set_child_property (container, child, PARAM_SPEC_PARAM_ID (pspec), &tmp_value, pspec);
 589       g_object_notify_queue_add (G_OBJECT (child), nqueue, pspec);
 590     }
 591   g_value_unset (&tmp_value);
 592 }
 593
 594 /**
 595  * gtk_container_child_get_valist:
 596  * @container: a #GtkContainer
 597  * @child: a widget which is a child of @container
 598  * @first_property_name: the name of the first property to get
 599  * @var_args: return location for the first property, followed
 600  *     optionally by more name/return location pairs, followed by %NULL
 601  *
 602  * Gets the values of one or more child properties for @child and @container.
 603  **/
 604 void
 605 gtk_container_child_get_valist (GtkContainer *container,
 606                                 GtkWidget    *child,
 607                                 const gchar  *first_property_name,
 608                                 va_list       var_args)
 609 {
 610   const gchar *name;
 611
 612   g_return_if_fail (GTK_IS_CONTAINER (container));
 613   g_return_if_fail (GTK_IS_WIDGET (child));
 614   g_return_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (container));
 615
 616   g_object_ref (container);
 617   g_object_ref (child);
 618
 619   name = first_property_name;
 620   while (name)
 621     {
 622       GValue value = { 0, };
 623       GParamSpec *pspec;
 624       gchar *error;
 625
 626       pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool,
 627                                         name,
 628                                         G_OBJECT_TYPE (container),
 629                                         TRUE);
 630       if (!pspec)
 631         {
 632           g_warning ("%s: container class `%s' has no child property named `%s'",
 633                      G_STRLOC,
 634                      G_OBJECT_TYPE_NAME (container),
 635                      name);
 636           break;
 637         }
 638       if (!(pspec->flags & G_PARAM_READABLE))
 639         {
 640           g_warning ("%s: child property `%s' of container class `%s' is not readable",
 641                      G_STRLOC,
 642                      pspec->name,
 643                      G_OBJECT_TYPE_NAME (container));
 644           break;
 645         }
 646       g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 647       container_get_child_property (container, child, pspec, &value);
 648       G_VALUE_LCOPY (&value, var_args, 0, &error);
 649       if (error)
 650         {
 651           g_warning ("%s: %s", G_STRLOC, error);
 652           g_free (error);
 653           g_value_unset (&value);
 654           break;
 655         }
 656       g_value_unset (&value);
 657       name = va_arg (var_args, gchar*);
 658     }
 659
 660   g_object_unref (child);
 661   g_object_unref (container);
 662 }
 663
 664 /**
 665  * gtk_container_child_get_property:
 666  * @container: a #GtkContainer
 667  * @child: a widget which is a child of @container
 668  * @property_name: the name of the property to get
 669  * @value: a location to return the value
 670  *
 671  * Gets the value of a child property for @child and @container.
 672  **/
 673 void
 674 gtk_container_child_get_property (GtkContainer *container,
 675                                   GtkWidget    *child,
 676                                   const gchar  *property_name,
 677                                   GValue       *value)
 678 {
 679   GParamSpec *pspec;
 680
 681   g_return_if_fail (GTK_IS_CONTAINER (container));
 682   g_return_if_fail (GTK_IS_WIDGET (child));
 683   g_return_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (container));
 684   g_return_if_fail (property_name != NULL);
 685   g_return_if_fail (G_IS_VALUE (value));
 686
 687   g_object_ref (container);
 688   g_object_ref (child);
 689   pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, property_name,
 690                                     G_OBJECT_TYPE (container), TRUE);
 691   if (!pspec)
 692     g_warning ("%s: container class `%s' has no child property named `%s'",
 693                G_STRLOC,
 694                G_OBJECT_TYPE_NAME (container),
 695                property_name);
 696   else if (!(pspec->flags & G_PARAM_READABLE))
 697     g_warning ("%s: child property `%s' of container class `%s' is not readable",
 698                G_STRLOC,
 699                pspec->name,
 700                G_OBJECT_TYPE_NAME (container));
 701   else
 702     {
 703       GValue *prop_value, tmp_value = { 0, };
 704
 705       /* auto-conversion of the callers value type
 706        */
 707       if (G_VALUE_TYPE (value) == G_PARAM_SPEC_VALUE_TYPE (pspec))
 708         {
 709           g_value_reset (value);
 710           prop_value = value;
 711         }
 712       else if (!g_value_type_transformable (G_PARAM_SPEC_VALUE_TYPE (pspec), G_VALUE_TYPE (value)))
 713         {
 714           g_warning ("can't retrieve child property `%s' of type `%s' as value of type `%s'",
 715                      pspec->name,
 716                      g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
 717                      G_VALUE_TYPE_NAME (value));
 718           g_object_unref (child);
 719           g_object_unref (container);
 720           return;
 721         }
 722       else
 723         {
 724           g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 725           prop_value = &tmp_value;
 726         }
 727       container_get_child_property (container, child, pspec, prop_value);
 728       if (prop_value != value)
 729         {
 730           g_value_transform (prop_value, value);
 731           g_value_unset (&tmp_value);
 732         }
 733     }
 734   g_object_unref (child);
 735   g_object_unref (container);
 736 }
 737
 738 /**
 739  * gtk_container_child_set_valist:
 740  * @container: a #GtkContainer
 741  * @child: a widget which is a child of @container
 742  * @first_property_name: the name of the first property to set
 743  * @var_args: a %NULL-terminated list of property names and values, starting
 744  *           with @first_prop_name
 745  *
 746  * Sets one or more child properties for @child and @container.
 747  **/
 748 void
 749 gtk_container_child_set_valist (GtkContainer *container,
 750                                 GtkWidget    *child,
 751                                 const gchar  *first_property_name,
 752                                 va_list       var_args)
 753 {
 754   GObjectNotifyQueue *nqueue;
 755   const gchar *name;
 756
 757   g_return_if_fail (GTK_IS_CONTAINER (container));
 758   g_return_if_fail (GTK_IS_WIDGET (child));
 759   g_return_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (container));
 760
 761   g_object_ref (container);
 762   g_object_ref (child);
 763
 764   nqueue = g_object_notify_queue_freeze (G_OBJECT (child), _gtk_widget_child_property_notify_context);
 765   name = first_property_name;
 766   while (name)
 767     {
 768       GValue value = { 0, };
 769       gchar *error = NULL;
 770       GParamSpec *pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool,
 771                                                     name,
 772                                                     G_OBJECT_TYPE (container),
 773                                                     TRUE);
 774       if (!pspec)
 775         {
 776           g_warning ("%s: container class `%s' has no child property named `%s'",
 777                      G_STRLOC,
 778                      G_OBJECT_TYPE_NAME (container),
 779                      name);
 780           break;
 781         }
 782       if (!(pspec->flags & G_PARAM_WRITABLE))
 783         {
 784           g_warning ("%s: child property `%s' of container class `%s' is not writable",
 785                      G_STRLOC,
 786                      pspec->name,
 787                      G_OBJECT_TYPE_NAME (container));
 788           break;
 789         }
 790       g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
 791       G_VALUE_COLLECT (&value, var_args, 0, &error);
 792       if (error)
 793         {
 794           g_warning ("%s: %s", G_STRLOC, error);
 795           g_free (error);
 796
 797           /* we purposely leak the value here, it might not be
 798            * in a sane state if an error condition occoured
 799            */
 800           break;
 801         }
 802       container_set_child_property (container, child, pspec, &value, nqueue);
 803       g_value_unset (&value);
 804       name = va_arg (var_args, gchar*);
 805     }
 806   g_object_notify_queue_thaw (G_OBJECT (child), nqueue);
 807
 808   g_object_unref (container);
 809   g_object_unref (child);
 810 }
 811
 812 /**
 813  * gtk_container_child_set_property:
 814  * @container: a #GtkContainer
 815  * @child: a widget which is a child of @container
 816  * @property_name: the name of the property to set
 817  * @value: the value to set the property to
 818  *
 819  * Sets a child property for @child and @container.
 820  **/
 821 void
 822 gtk_container_child_set_property (GtkContainer *container,
 823                                   GtkWidget    *child,
 824                                   const gchar  *property_name,
 825                                   const GValue *value)
 826 {
 827   GObjectNotifyQueue *nqueue;
 828   GParamSpec *pspec;
 829
 830   g_return_if_fail (GTK_IS_CONTAINER (container));
 831   g_return_if_fail (GTK_IS_WIDGET (child));
 832   g_return_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (container));
 833   g_return_if_fail (property_name != NULL);
 834   g_return_if_fail (G_IS_VALUE (value));
 835
 836   g_object_ref (container);
 837   g_object_ref (child);
 838
 839   nqueue = g_object_notify_queue_freeze (G_OBJECT (child), _gtk_widget_child_property_notify_context);
 840   pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, property_name,
 841                                     G_OBJECT_TYPE (container), TRUE);
 842   if (!pspec)
 843     g_warning ("%s: container class `%s' has no child property named `%s'",
 844                G_STRLOC,
 845                G_OBJECT_TYPE_NAME (container),
 846                property_name);
 847   else if (!(pspec->flags & G_PARAM_WRITABLE))
 848     g_warning ("%s: child property `%s' of container class `%s' is not writable",
 849                G_STRLOC,
 850                pspec->name,
 851                G_OBJECT_TYPE_NAME (container));
 852   else
 853     {
 854       container_set_child_property (container, child, pspec, value, nqueue);
 855     }
 856   g_object_notify_queue_thaw (G_OBJECT (child), nqueue);
 857   g_object_unref (container);
 858   g_object_unref (child);
 859 }
 860
 861 /**
 862  * gtk_container_add_with_properties:
 863  * @container: a #GtkContainer
 864  * @widget: a widget to be placed inside @container
 865  * @first_prop_name: the name of the first child property to set
 866  * @Varargs: a %NULL-terminated list of property names and values, starting
 867  *           with @first_prop_name
 868  *
 869  * Adds @widget to @container, setting child properties at the same time.
 870  * See gtk_container_add() and gtk_container_child_set() for more details.
 871  **/
 872 void
 873 gtk_container_add_with_properties (GtkContainer *container,
 874                                    GtkWidget    *widget,
 875                                    const gchar  *first_prop_name,
 876                                    ...)
 877 {
 878   g_return_if_fail (GTK_IS_CONTAINER (container));
 879   g_return_if_fail (GTK_IS_WIDGET (widget));
 880   g_return_if_fail (gtk_widget_get_parent (widget) == NULL);
 881
 882   g_object_ref (container);
 883   g_object_ref (widget);
 884   gtk_widget_freeze_child_notify (widget);
 885
 886   g_signal_emit (container, container_signals[ADD], 0, widget);
 887   if (gtk_widget_get_parent (widget))
 888     {
 889       va_list var_args;
 890
 891       va_start (var_args, first_prop_name);
 892       gtk_container_child_set_valist (container, widget, first_prop_name, var_args);
 893       va_end (var_args);
 894     }
 895
 896   gtk_widget_thaw_child_notify (widget);
 897   g_object_unref (widget);
 898   g_object_unref (container);
 899 }
 900
 901 /**
 902  * gtk_container_child_set:
 903  * @container: a #GtkContainer
 904  * @child: a widget which is a child of @container
 905  * @first_prop_name: the name of the first property to set
 906  * @Varargs: a %NULL-terminated list of property names and values, starting
 907  *           with @first_prop_name
 908  *
 909  * Sets one or more child properties for @child and @container.
 910  **/
 911 void
 912 gtk_container_child_set (GtkContainer      *container,
 913                          GtkWidget         *child,
 914                          const gchar       *first_prop_name,
 915                          ...)
 916 {
 917   va_list var_args;
 918
 919   g_return_if_fail (GTK_IS_CONTAINER (container));
 920   g_return_if_fail (GTK_IS_WIDGET (child));
 921   g_return_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (container));
 922
 923   va_start (var_args, first_prop_name);
 924   gtk_container_child_set_valist (container, child, first_prop_name, var_args);
 925   va_end (var_args);
 926 }
 927
 928 /**
 929  * gtk_container_child_get:
 930  * @container: a #GtkContainer
 931  * @child: a widget which is a child of @container
 932  * @first_prop_name: the name of the first property to get
 933  * @Varargs: return location for the first property, followed
 934  *     optionally by more name/return location pairs, followed by %NULL
 935  *
 936  * Gets the values of one or more child properties for @child and @container.
 937  **/
 938 void
 939 gtk_container_child_get (GtkContainer      *container,
 940                          GtkWidget         *child,
 941                          const gchar       *first_prop_name,
 942                          ...)
 943 {
 944   va_list var_args;
 945
 946   g_return_if_fail (GTK_IS_CONTAINER (container));
 947   g_return_if_fail (GTK_IS_WIDGET (child));
 948   g_return_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (container));
 949
 950   va_start (var_args, first_prop_name);
 951   gtk_container_child_get_valist (container, child, first_prop_name, var_args);
 952   va_end (var_args);
 953 }
 954
 955 /**
 956  * gtk_container_class_install_child_property:
 957  * @cclass: a #GtkContainerClass
 958  * @property_id: the id for the property
 959  * @pspec: the #GParamSpec for the property
 960  *
 961  * Installs a child property on a container class.
 962  **/
 963 void
 964 gtk_container_class_install_child_property (GtkContainerClass *cclass,
 965                                             guint              property_id,
 966                                             GParamSpec        *pspec)
 967 {
 968   g_return_if_fail (GTK_IS_CONTAINER_CLASS (cclass));
 969   g_return_if_fail (G_IS_PARAM_SPEC (pspec));
 970   if (pspec->flags & G_PARAM_WRITABLE)
 971     g_return_if_fail (cclass->set_child_property != NULL);
 972   if (pspec->flags & G_PARAM_READABLE)
 973     g_return_if_fail (cclass->get_child_property != NULL);
 974   g_return_if_fail (property_id > 0);
 975   g_return_if_fail (PARAM_SPEC_PARAM_ID (pspec) == 0);  /* paranoid */
 976   if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
 977     g_return_if_fail ((pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) == 0);
 978
 979   if (g_param_spec_pool_lookup (_gtk_widget_child_property_pool, pspec->name, G_OBJECT_CLASS_TYPE (cclass), FALSE))
 980     {
 981       g_warning (G_STRLOC ": class `%s' already contains a child property named `%s'",
 982                  G_OBJECT_CLASS_NAME (cclass),
 983                  pspec->name);
 984       return;
 985     }
 986   g_param_spec_ref (pspec);
 987   g_param_spec_sink (pspec);
 988   PARAM_SPEC_SET_PARAM_ID (pspec, property_id);
 989   g_param_spec_pool_insert (_gtk_widget_child_property_pool, pspec, G_OBJECT_CLASS_TYPE (cclass));
 990 }
 991
 992 /**
 993  * gtk_container_class_find_child_property:
 994  * @cclass: a #GtkContainerClass
 995  * @property_name: the name of the child property to find
 996  * @returns: (allow-none): the #GParamSpec of the child property or %NULL if @class has no
 997  *   child property with that name.
 998  *
 999  * Finds a child property of a container class by name.
1000  */
1001 GParamSpec*
1002 gtk_container_class_find_child_property (GObjectClass *cclass,
1003                                          const gchar  *property_name)
1004 {
1005   g_return_val_if_fail (GTK_IS_CONTAINER_CLASS (cclass), NULL);
1006   g_return_val_if_fail (property_name != NULL, NULL);
1007
1008   return g_param_spec_pool_lookup (_gtk_widget_child_property_pool,
1009                                    property_name,
1010                                    G_OBJECT_CLASS_TYPE (cclass),
1011                                    TRUE);
1012 }
1013
1014 /**
1015  * gtk_container_class_list_child_properties:
1016  * @cclass: a #GtkContainerClass
1017  * @n_properties: location to return the number of child properties found
1018  * @returns: a newly allocated %NULL-terminated array of #GParamSpec*.
1019  *           The array must be freed with g_free().
1020  *
1021  * Returns all child properties of a container class.
1022  */
1023 GParamSpec**
1024 gtk_container_class_list_child_properties (GObjectClass *cclass,
1025                                            guint        *n_properties)
1026 {
1027   GParamSpec **pspecs;
1028   guint n;
1029
1030   g_return_val_if_fail (GTK_IS_CONTAINER_CLASS (cclass), NULL);
1031
1032   pspecs = g_param_spec_pool_list (_gtk_widget_child_property_pool,
1033                                    G_OBJECT_CLASS_TYPE (cclass),
1034                                    &n);
1035   if (n_properties)
1036     *n_properties = n;
1037
1038   return pspecs;
1039 }
1040
1041 static void
1042 gtk_container_add_unimplemented (GtkContainer     *container,
1043                                  GtkWidget        *widget)
1044 {
1045   g_warning ("GtkContainerClass::add not implemented for `%s'", g_type_name (G_TYPE_FROM_INSTANCE (container)));
1046 }
1047
1048 static void
1049 gtk_container_remove_unimplemented (GtkContainer     *container,
1050                                     GtkWidget        *widget)
1051 {
1052   g_warning ("GtkContainerClass::remove not implemented for `%s'", g_type_name (G_TYPE_FROM_INSTANCE (container)));
1053 }
1054
1055 static void
1056 gtk_container_init (GtkContainer *container)
1057 {
1058   GtkContainerPrivate *priv;
1059
1060   container->priv = G_TYPE_INSTANCE_GET_PRIVATE (container,
1061                                                  GTK_TYPE_CONTAINER,
1062                                                  GtkContainerPrivate);
1063   priv = container->priv;
1064
1065   priv->focus_child = NULL;
1066   priv->border_width = 0;
1067   priv->need_resize = FALSE;
1068   priv->resize_mode = GTK_RESIZE_PARENT;
1069   priv->reallocate_redraws = FALSE;
1070 }
1071
1072 static void
1073 gtk_container_destroy (GtkObject *object)
1074 {
1075   GtkContainer *container = GTK_CONTAINER (object);
1076   GtkContainerPrivate *priv = container->priv;
1077
1078   if (GTK_CONTAINER_RESIZE_PENDING (container))
1079     _gtk_container_dequeue_resize_handler (container);
1080
1081   if (priv->focus_child)
1082     {
1083       g_object_unref (priv->focus_child);
1084       priv->focus_child = NULL;
1085     }
1086
1087   /* do this before walking child widgets, to avoid
1088    * removing children from focus chain one by one.
1089    */
1090   if (priv->has_focus_chain)
1091     gtk_container_unset_focus_chain (container);
1092
1093   gtk_container_foreach (container, (GtkCallback) gtk_widget_destroy, NULL);
1094
1095   GTK_OBJECT_CLASS (parent_class)->destroy (object);
1096 }
1097
1098 static void
1099 gtk_container_set_property (GObject         *object,
1100                             guint            prop_id,
1101                             const GValue    *value,
1102                             GParamSpec      *pspec)
1103 {
1104   GtkContainer *container = GTK_CONTAINER (object);
1105
1106   switch (prop_id)
1107     {
1108     case PROP_BORDER_WIDTH:
1109       gtk_container_set_border_width (container, g_value_get_uint (value));
1110       break;
1111     case PROP_RESIZE_MODE:
1112       gtk_container_set_resize_mode (container, g_value_get_enum (value));
1113       break;
1114     case PROP_CHILD:
1115       gtk_container_add (container, GTK_WIDGET (g_value_get_object (value)));
1116       break;
1117     default:
1118       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1119       break;
1120     }
1121 }
1122
1123 static void
1124 gtk_container_get_property (GObject         *object,
1125                             guint            prop_id,
1126                             GValue          *value,
1127                             GParamSpec      *pspec)
1128 {
1129   GtkContainer *container = GTK_CONTAINER (object);
1130   GtkContainerPrivate *priv = container->priv;
1131
1132   switch (prop_id)
1133     {
1134     case PROP_BORDER_WIDTH:
1135       g_value_set_uint (value, priv->border_width);
1136       break;
1137     case PROP_RESIZE_MODE:
1138       g_value_set_enum (value, priv->resize_mode);
1139       break;
1140     default:
1141       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1142       break;
1143     }
1144 }
1145
1146 /**
1147  * gtk_container_set_border_width:
1148  * @container: a #GtkContainer
1149  * @border_width: amount of blank space to leave <emphasis>outside</emphasis>
1150  *   the container. Valid values are in the range 0-65535 pixels.
1151  *
1152  * Sets the border width of the container.
1153  *
1154  * The border width of a container is the amount of space to leave
1155  * around the outside of the container. The only exception to this is
1156  * #GtkWindow; because toplevel windows can't leave space outside,
1157  * they leave the space inside. The border is added on all sides of
1158  * the container. To add space to only one side, one approach is to
1159  * create a #GtkAlignment widget, call gtk_widget_set_size_request()
1160  * to give it a size, and place it on the side of the container as
1161  * a spacer.
1162  **/
1163 void
1164 gtk_container_set_border_width (GtkContainer *container,
1165                                 guint         border_width)
1166 {
1167   GtkContainerPrivate *priv;
1168
1169   g_return_if_fail (GTK_IS_CONTAINER (container));
1170
1171   priv = container->priv;
1172
1173   if (priv->border_width != border_width)
1174     {
1175       priv->border_width = border_width;
1176       g_object_notify (G_OBJECT (container), "border-width");
1177
1178       if (gtk_widget_get_realized (GTK_WIDGET (container)))
1179         gtk_widget_queue_resize (GTK_WIDGET (container));
1180     }
1181 }
1182
1183 /**
1184  * gtk_container_get_border_width:
1185  * @container: a #GtkContainer
1186  *
1187  * Retrieves the border width of the container. See
1188  * gtk_container_set_border_width().
1189  *
1190  * Return value: the current border width
1191  **/
1192 guint
1193 gtk_container_get_border_width (GtkContainer *container)
1194 {
1195   g_return_val_if_fail (GTK_IS_CONTAINER (container), 0);
1196
1197   return container->priv->border_width;
1198 }
1199
1200 /**
1201  * gtk_container_add:
1202  * @container: a #GtkContainer
1203  * @widget: a widget to be placed inside @container
1204  *
1205  * Adds @widget to @container. Typically used for simple containers
1206  * such as #GtkWindow, #GtkFrame, or #GtkButton; for more complicated
1207  * layout containers such as #GtkBox or #GtkTable, this function will
1208  * pick default packing parameters that may not be correct.  So
1209  * consider functions such as gtk_box_pack_start() and
1210  * gtk_table_attach() as an alternative to gtk_container_add() in
1211  * those cases. A widget may be added to only one container at a time;
1212  * you can't place the same widget inside two different containers.
1213  **/
1214 void
1215 gtk_container_add (GtkContainer *container,
1216                    GtkWidget    *widget)
1217 {
1218   GtkWidget *parent;
1219
1220   g_return_if_fail (GTK_IS_CONTAINER (container));
1221   g_return_if_fail (GTK_IS_WIDGET (widget));
1222
1223   parent = gtk_widget_get_parent (widget);
1224
1225   if (parent != NULL)
1226     {
1227       g_warning ("Attempting to add a widget with type %s to a container of "
1228                  "type %s, but the widget is already inside a container of type %s, "
1229                  "the GTK+ FAQ at http://library.gnome.org/devel/gtk-faq/stable/ "
1230                  "explains how to reparent a widget.",
1231                  g_type_name (G_OBJECT_TYPE (widget)),
1232                  g_type_name (G_OBJECT_TYPE (container)),
1233                  g_type_name (G_OBJECT_TYPE (parent)));
1234       return;
1235     }
1236
1237   g_signal_emit (container, container_signals[ADD], 0, widget);
1238 }
1239
1240 /**
1241  * gtk_container_remove:
1242  * @container: a #GtkContainer
1243  * @widget: a current child of @container
1244  *
1245  * Removes @widget from @container. @widget must be inside @container.
1246  * Note that @container will own a reference to @widget, and that this
1247  * may be the last reference held; so removing a widget from its
1248  * container can destroy that widget. If you want to use @widget
1249  * again, you need to add a reference to it while it's not inside
1250  * a container, using g_object_ref(). If you don't want to use @widget
1251  * again it's usually more efficient to simply destroy it directly
1252  * using gtk_widget_destroy() since this will remove it from the
1253  * container and help break any circular reference count cycles.
1254  **/
1255 void
1256 gtk_container_remove (GtkContainer *container,
1257                       GtkWidget    *widget)
1258 {
1259   g_return_if_fail (GTK_IS_CONTAINER (container));
1260   g_return_if_fail (GTK_IS_WIDGET (widget));
1261   g_return_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (container));
1262
1263   g_signal_emit (container, container_signals[REMOVE], 0, widget);
1264 }
1265
1266 void
1267 _gtk_container_dequeue_resize_handler (GtkContainer *container)
1268 {
1269   g_return_if_fail (GTK_IS_CONTAINER (container));
1270   g_return_if_fail (GTK_CONTAINER_RESIZE_PENDING (container));
1271
1272   container_resize_queue = g_slist_remove (container_resize_queue, container);
1273   GTK_PRIVATE_UNSET_FLAG (container, GTK_RESIZE_PENDING);
1274 }
1275
1276 /**
1277  * gtk_container_set_resize_mode:
1278  * @container: a #GtkContainer
1279  * @resize_mode: the new resize mode
1280  *
1281  * Sets the resize mode for the container.
1282  *
1283  * The resize mode of a container determines whether a resize request
1284  * will be passed to the container's parent, queued for later execution
1285  * or executed immediately.
1286  **/
1287 void
1288 gtk_container_set_resize_mode (GtkContainer  *container,
1289                                GtkResizeMode  resize_mode)
1290 {
1291   GtkContainerPrivate *priv;
1292
1293   g_return_if_fail (GTK_IS_CONTAINER (container));
1294   g_return_if_fail (resize_mode <= GTK_RESIZE_IMMEDIATE);
1295
1296   priv = container->priv;
1297
1298   if (gtk_widget_is_toplevel (GTK_WIDGET (container)) &&
1299       resize_mode == GTK_RESIZE_PARENT)
1300     {
1301       resize_mode = GTK_RESIZE_QUEUE;
1302     }
1303
1304   if (priv->resize_mode != resize_mode)
1305     {
1306       priv->resize_mode = resize_mode;
1307
1308       gtk_widget_queue_resize (GTK_WIDGET (container));
1309       g_object_notify (G_OBJECT (container), "resize-mode");
1310     }
1311 }
1312
1313 /**
1314  * gtk_container_get_resize_mode:
1315  * @container: a #GtkContainer
1316  *
1317  * Returns the resize mode for the container. See
1318  * gtk_container_set_resize_mode ().
1319  *
1320  * Return value: the current resize mode
1321  **/
1322 GtkResizeMode
1323 gtk_container_get_resize_mode (GtkContainer *container)
1324 {
1325   g_return_val_if_fail (GTK_IS_CONTAINER (container), GTK_RESIZE_PARENT);
1326
1327   return container->priv->resize_mode;
1328 }
1329
1330 /**
1331  * gtk_container_set_reallocate_redraws:
1332  * @container: a #GtkContainer
1333  * @needs_redraws: the new value for the container's @reallocate_redraws flag
1334  *
1335  * Sets the @reallocate_redraws flag of the container to the given value.
1336  *
1337  * Containers requesting reallocation redraws get automatically
1338  * redrawn if any of their children changed allocation.
1339  **/
1340 void
1341 gtk_container_set_reallocate_redraws (GtkContainer *container,
1342                                       gboolean      needs_redraws)
1343 {
1344   g_return_if_fail (GTK_IS_CONTAINER (container));
1345
1346   container->priv->reallocate_redraws = needs_redraws ? TRUE : FALSE;
1347 }
1348
1349 static GtkContainer*
1350 gtk_container_get_resize_container (GtkContainer *container)
1351 {
1352   GtkWidget *parent;
1353   GtkWidget *widget = GTK_WIDGET (container);
1354
1355   while ((parent = gtk_widget_get_parent (widget)))
1356     {
1357       widget = parent;
1358       if (GTK_IS_RESIZE_CONTAINER (widget))
1359         break;
1360     }
1361
1362   return GTK_IS_RESIZE_CONTAINER (widget) ? (GtkContainer*) widget : NULL;
1363 }
1364
1365 static gboolean
1366 gtk_container_idle_sizer (gpointer data)
1367 {
1368   /* we may be invoked with a container_resize_queue of NULL, because
1369    * queue_resize could have been adding an extra idle function while
1370    * the queue still got processed. we better just ignore such case
1371    * than trying to explicitely work around them with some extra flags,
1372    * since it doesn't cause any actual harm.
1373    */
1374   while (container_resize_queue)
1375     {
1376       GSList *slist;
1377       GtkWidget *widget;
1378
1379       slist = container_resize_queue;
1380       container_resize_queue = slist->next;
1381       widget = slist->data;
1382       g_slist_free_1 (slist);
1383
1384       GTK_PRIVATE_UNSET_FLAG (widget, GTK_RESIZE_PENDING);
1385       gtk_container_check_resize (GTK_CONTAINER (widget));
1386     }
1387
1388   gdk_window_process_all_updates ();
1389
1390   return FALSE;
1391 }
1392
1393 void
1394 _gtk_container_queue_resize (GtkContainer *container)
1395 {
1396   GtkContainerPrivate *priv;
1397   GtkContainer *resize_container;
1398   GtkWidget *parent;
1399   GtkWidget *widget;
1400
1401   g_return_if_fail (GTK_IS_CONTAINER (container));
1402
1403   priv = container->priv;
1404   widget = GTK_WIDGET (container);
1405
1406   resize_container = gtk_container_get_resize_container (container);
1407
1408   while (TRUE)
1409     {
1410       GTK_PRIVATE_SET_FLAG (widget, GTK_ALLOC_NEEDED);
1411       GTK_PRIVATE_SET_FLAG (widget, GTK_REQUEST_NEEDED);
1412       GTK_PRIVATE_SET_FLAG (widget, GTK_WIDTH_REQUEST_NEEDED);
1413       GTK_PRIVATE_SET_FLAG (widget, GTK_HEIGHT_REQUEST_NEEDED);
1414
1415       if ((resize_container && widget == GTK_WIDGET (resize_container)) ||
1416           !(parent = gtk_widget_get_parent (widget)))
1417         break;
1418
1419       widget = parent;
1420     }
1421
1422   if (resize_container)
1423     {
1424       if (gtk_widget_get_visible (GTK_WIDGET (resize_container)) &&
1425           (gtk_widget_is_toplevel (GTK_WIDGET (resize_container)) ||
1426            gtk_widget_get_realized (GTK_WIDGET (resize_container))))
1427         {
1428           switch (resize_container->priv->resize_mode)
1429             {
1430             case GTK_RESIZE_QUEUE:
1431               if (!GTK_CONTAINER_RESIZE_PENDING (resize_container))
1432                 {
1433                   GTK_PRIVATE_SET_FLAG (resize_container, GTK_RESIZE_PENDING);
1434                   if (container_resize_queue == NULL)
1435                     gdk_threads_add_idle_full (GTK_PRIORITY_RESIZE,
1436                                      gtk_container_idle_sizer,
1437                                      NULL, NULL);
1438                   container_resize_queue = g_slist_prepend (container_resize_queue, resize_container);
1439                 }
1440               break;
1441
1442             case GTK_RESIZE_IMMEDIATE:
1443               gtk_container_check_resize (resize_container);
1444               break;
1445
1446             case GTK_RESIZE_PARENT:
1447               g_assert_not_reached ();
1448               break;
1449             }
1450         }
1451       else
1452         {
1453           /* we need to let hidden resize containers know that something
1454            * changed while they where hidden (currently only evaluated by
1455            * toplevels).
1456            */
1457           resize_container->priv->need_resize = TRUE;
1458         }
1459     }
1460 }
1461
1462 void
1463 gtk_container_check_resize (GtkContainer *container)
1464 {
1465   g_return_if_fail (GTK_IS_CONTAINER (container));
1466
1467   g_signal_emit (container, container_signals[CHECK_RESIZE], 0);
1468 }
1469
1470 static void
1471 gtk_container_real_check_resize (GtkContainer *container)
1472 {
1473   GtkWidget *widget = GTK_WIDGET (container);
1474   GtkAllocation allocation;
1475   GtkRequisition requisition;
1476
1477   gtk_widget_size_request (widget, &requisition);
1478   gtk_widget_get_allocation (widget, &allocation);
1479
1480   if (requisition.width > allocation.width ||
1481       requisition.height > allocation.height)
1482     {
1483       if (GTK_IS_RESIZE_CONTAINER (container))
1484         {
1485           gtk_widget_size_allocate (widget, &allocation);
1486           gtk_widget_set_allocation (widget, &allocation);
1487         }
1488       else
1489         gtk_widget_queue_resize (widget);
1490     }
1491   else
1492     {
1493       gtk_container_resize_children (container);
1494     }
1495 }
1496
1497 /* The container hasn't changed size but one of its children
1498  *  queued a resize request. Which means that the allocation
1499  *  is not sufficient for the requisition of some child.
1500  *  We've already performed a size request at this point,
1501  *  so we simply need to reallocate and let the allocation
1502  *  trickle down via GTK_WIDGET_ALLOC_NEEDED flags.
1503  */
1504 void
1505 gtk_container_resize_children (GtkContainer *container)
1506 {
1507   GtkAllocation allocation;
1508   GtkWidget *widget;
1509
1510   /* resizing invariants:
1511    * toplevels have *always* resize_mode != GTK_RESIZE_PARENT set.
1512    * containers that have an idle sizer pending must be flagged with
1513    * RESIZE_PENDING.
1514    */
1515   g_return_if_fail (GTK_IS_CONTAINER (container));
1516
1517   widget = GTK_WIDGET (container);
1518   gtk_widget_get_allocation (widget, &allocation);
1519
1520   gtk_widget_size_allocate (widget, &allocation);
1521   gtk_widget_set_allocation (widget, &allocation);
1522 }
1523
1524 /**
1525  * gtk_container_forall:
1526  * @container: a #GtkContainer
1527  * @callback: a callback
1528  * @callback_data: callback user data
1529  *
1530  * Invokes @callback on each child of @container, including children
1531  * that are considered "internal" (implementation details of the
1532  * container). "Internal" children generally weren't added by the user
1533  * of the container, but were added by the container implementation
1534  * itself.  Most applications should use gtk_container_foreach(),
1535  * rather than gtk_container_forall().
1536  **/
1537 void
1538 gtk_container_forall (GtkContainer *container,
1539                       GtkCallback   callback,
1540                       gpointer      callback_data)
1541 {
1542   GtkContainerClass *class;
1543
1544   g_return_if_fail (GTK_IS_CONTAINER (container));
1545   g_return_if_fail (callback != NULL);
1546
1547   class = GTK_CONTAINER_GET_CLASS (container);
1548
1549   if (class->forall)
1550     class->forall (container, TRUE, callback, callback_data);
1551 }
1552
1553 /**
1554  * gtk_container_foreach:
1555  * @container: a #GtkContainer
1556  * @callback: a callback
1557  * @callback_data: callback user data
1558  *
1559  * Invokes @callback on each non-internal child of @container. See
1560  * gtk_container_forall() for details on what constitutes an
1561  * "internal" child.  Most applications should use
1562  * gtk_container_foreach(), rather than gtk_container_forall().
1563  **/
1564 void
1565 gtk_container_foreach (GtkContainer *container,
1566                        GtkCallback   callback,
1567                        gpointer      callback_data)
1568 {
1569   GtkContainerClass *class;
1570
1571   g_return_if_fail (GTK_IS_CONTAINER (container));
1572   g_return_if_fail (callback != NULL);
1573
1574   class = GTK_CONTAINER_GET_CLASS (container);
1575
1576   if (class->forall)
1577     class->forall (container, FALSE, callback, callback_data);
1578 }
1579
1580 /**
1581  * gtk_container_set_focus_child:
1582  * @container: a #GtkContainer
1583  * @child: (allow-none): a #GtkWidget, or %NULL
1584  *
1585  * Sets, or unsets if @child is %NULL, the focused child of @container.
1586  *
1587  * This function emits the GtkContainer::set_focus_child signal of
1588  * @container. Implementations of #GtkContainer can override the
1589  * default behaviour by overriding the class closure of this signal.
1590  *
1591  * This is function is mostly meant to be used by widgets. Applications can use
1592  * gtk_widget_grab_focus() to manualy set the focus to a specific widget.
1593  */
1594 void
1595 gtk_container_set_focus_child (GtkContainer *container,
1596                                GtkWidget    *child)
1597 {
1598   g_return_if_fail (GTK_IS_CONTAINER (container));
1599   if (child)
1600     g_return_if_fail (GTK_IS_WIDGET (child));
1601
1602   g_signal_emit (container, container_signals[SET_FOCUS_CHILD], 0, child);
1603 }
1604
1605 /**
1606  * gtk_container_get_focus_child:
1607  * @container: a #GtkContainer
1608  *
1609  * Returns the current focus child widget inside @container. This is not the
1610  * currently focused widget. That can be obtained by calling
1611  * gtk_window_get_focus().
1612  *
1613  * Returns: The child widget which will recieve the focus inside @container when
1614  *          the @conatiner is focussed, or %NULL if none is set.
1615  *
1616  * Since: 2.14
1617  **/
1618 GtkWidget *
1619 gtk_container_get_focus_child (GtkContainer *container)
1620 {
1621   g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL);
1622
1623   return container->priv->focus_child;
1624 }
1625
1626 /**
1627  * gtk_container_get_children:
1628  * @container: a #GtkContainer
1629  *
1630  * Returns the container's non-internal children. See
1631  * gtk_container_forall() for details on what constitutes an "internal" child.
1632  *
1633  * Return value: (element-type GtkWidget) (transfer container): a newly-allocated list of the container's non-internal children.
1634  **/
1635 GList*
1636 gtk_container_get_children (GtkContainer *container)
1637 {
1638   GList *children = NULL;
1639
1640   gtk_container_foreach (container,
1641                          gtk_container_children_callback,
1642                          &children);
1643
1644   return g_list_reverse (children);
1645 }
1646
1647 static void
1648 gtk_container_child_position_callback (GtkWidget *widget,
1649                                        gpointer   client_data)
1650 {
1651   struct {
1652     GtkWidget *child;
1653     guint i;
1654     guint index;
1655   } *data = client_data;
1656
1657   data->i++;
1658   if (data->child == widget)
1659     data->index = data->i;
1660 }
1661
1662 static gchar*
1663 gtk_container_child_default_composite_name (GtkContainer *container,
1664                                             GtkWidget    *child)
1665 {
1666   struct {
1667     GtkWidget *child;
1668     guint i;
1669     guint index;
1670   } data;
1671   gchar *name;
1672
1673   /* fallback implementation */
1674   data.child = child;
1675   data.i = 0;
1676   data.index = 0;
1677   gtk_container_forall (container,
1678                         gtk_container_child_position_callback,
1679                         &data);
1680
1681   name = g_strdup_printf ("%s-%u",
1682                           g_type_name (G_TYPE_FROM_INSTANCE (child)),
1683                           data.index);
1684
1685   return name;
1686 }
1687
1688 gchar*
1689 _gtk_container_child_composite_name (GtkContainer *container,
1690                                     GtkWidget    *child)
1691 {
1692   gboolean composite_child;
1693
1694   g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL);
1695   g_return_val_if_fail (GTK_IS_WIDGET (child), NULL);
1696   g_return_val_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (container), NULL);
1697
1698   g_object_get (child, "composite-child", &composite_child, NULL);
1699   if (composite_child)
1700     {
1701       static GQuark quark_composite_name = 0;
1702       gchar *name;
1703
1704       if (!quark_composite_name)
1705         quark_composite_name = g_quark_from_static_string ("gtk-composite-name");
1706
1707       name = g_object_get_qdata (G_OBJECT (child), quark_composite_name);
1708       if (!name)
1709         {
1710           GtkContainerClass *class;
1711
1712           class = GTK_CONTAINER_GET_CLASS (container);
1713           if (class->composite_name)
1714             name = class->composite_name (container, child);
1715         }
1716       else
1717         name = g_strdup (name);
1718
1719       return name;
1720     }
1721
1722   return NULL;
1723 }
1724
1725 static void
1726 gtk_container_real_set_focus_child (GtkContainer     *container,
1727                                     GtkWidget        *child)
1728 {
1729   GtkContainerPrivate *priv;
1730
1731   g_return_if_fail (GTK_IS_CONTAINER (container));
1732   g_return_if_fail (child == NULL || GTK_IS_WIDGET (child));
1733
1734   priv = container->priv;
1735
1736   if (child != priv->focus_child)
1737     {
1738       if (priv->focus_child)
1739         g_object_unref (priv->focus_child);
1740       priv->focus_child = child;
1741       if (priv->focus_child)
1742         g_object_ref (priv->focus_child);
1743     }
1744
1745
1746   /* check for h/v adjustments
1747    */
1748   if (priv->focus_child)
1749     {
1750       GtkAdjustment *hadj;
1751       GtkAdjustment *vadj;
1752       GtkAllocation allocation;
1753       GtkWidget *focus_child;
1754       gint x, y;
1755
1756       hadj = g_object_get_qdata (G_OBJECT (container), hadjustment_key_id);
1757       vadj = g_object_get_qdata (G_OBJECT (container), vadjustment_key_id);
1758       if (hadj || vadj)
1759         {
1760
1761           focus_child = priv->focus_child;
1762           while (gtk_container_get_focus_child (GTK_CONTAINER (focus_child)))
1763             {
1764               focus_child = gtk_container_get_focus_child (GTK_CONTAINER (focus_child));
1765             }
1766
1767           gtk_widget_translate_coordinates (focus_child, priv->focus_child,
1768                                             0, 0, &x, &y);
1769
1770           gtk_widget_get_allocation (priv->focus_child, &allocation);
1771           x += allocation.x;
1772           y += allocation.y;
1773
1774           gtk_widget_get_allocation (focus_child, &allocation);
1775
1776           if (vadj)
1777             gtk_adjustment_clamp_page (vadj, y, y + allocation.height);
1778
1779           if (hadj)
1780             gtk_adjustment_clamp_page (hadj, x, x + allocation.width);
1781         }
1782     }
1783 }
1784
1785 static GList*
1786 get_focus_chain (GtkContainer *container)
1787 {
1788   return g_object_get_data (G_OBJECT (container), "gtk-container-focus-chain");
1789 }
1790
1791 /* same as gtk_container_get_children, except it includes internals
1792  */
1793 static GList *
1794 gtk_container_get_all_children (GtkContainer *container)
1795 {
1796   GList *children = NULL;
1797
1798   gtk_container_forall (container,
1799                          gtk_container_children_callback,
1800                          &children);
1801
1802   return children;
1803 }
1804
1805 static gboolean
1806 gtk_container_focus (GtkWidget        *widget,
1807                      GtkDirectionType  direction)
1808 {
1809   GList *children;
1810   GList *sorted_children;
1811   gint return_val;
1812   GtkContainer *container;
1813   GtkContainerPrivate *priv;
1814
1815   g_return_val_if_fail (GTK_IS_CONTAINER (widget), FALSE);
1816
1817   container = GTK_CONTAINER (widget);
1818   priv = container->priv;
1819
1820   return_val = FALSE;
1821
1822   if (gtk_widget_get_can_focus (widget))
1823     {
1824       if (!gtk_widget_has_focus (widget))
1825         {
1826           gtk_widget_grab_focus (widget);
1827           return_val = TRUE;
1828         }
1829     }
1830   else
1831     {
1832       /* Get a list of the containers children, allowing focus
1833        * chain to override.
1834        */
1835       if (priv->has_focus_chain)
1836         children = g_list_copy (get_focus_chain (container));
1837       else
1838         children = gtk_container_get_all_children (container);
1839
1840       if (priv->has_focus_chain &&
1841           (direction == GTK_DIR_TAB_FORWARD ||
1842            direction == GTK_DIR_TAB_BACKWARD))
1843         {
1844           sorted_children = g_list_copy (children);
1845
1846           if (direction == GTK_DIR_TAB_BACKWARD)
1847             sorted_children = g_list_reverse (sorted_children);
1848         }
1849       else
1850         sorted_children = _gtk_container_focus_sort (container, children, direction, NULL);
1851
1852       return_val = gtk_container_focus_move (container, sorted_children, direction);
1853
1854       g_list_free (sorted_children);
1855       g_list_free (children);
1856     }
1857
1858   return return_val;
1859 }
1860
1861 static gint
1862 tab_compare (gconstpointer a,
1863              gconstpointer b,
1864              gpointer      data)
1865 {
1866   GtkAllocation child1_allocation, child2_allocation;
1867   const GtkWidget *child1 = a;
1868   const GtkWidget *child2 = b;
1869   GtkTextDirection text_direction = GPOINTER_TO_INT (data);
1870
1871   gtk_widget_get_allocation ((GtkWidget *) child1, &child1_allocation);
1872   gtk_widget_get_allocation ((GtkWidget *) child2, &child2_allocation);
1873
1874   gint y1 = child1_allocation.y + child1_allocation.height / 2;
1875   gint y2 = child2_allocation.y + child2_allocation.height / 2;
1876
1877   if (y1 == y2)
1878     {
1879       gint x1 = child1_allocation.x + child1_allocation.width / 2;
1880       gint x2 = child2_allocation.x + child2_allocation.width / 2;
1881
1882       if (text_direction == GTK_TEXT_DIR_RTL)
1883         return (x1 < x2) ? 1 : ((x1 == x2) ? 0 : -1);
1884       else
1885         return (x1 < x2) ? -1 : ((x1 == x2) ? 0 : 1);
1886     }
1887   else
1888     return (y1 < y2) ? -1 : 1;
1889 }
1890
1891 static GList *
1892 gtk_container_focus_sort_tab (GtkContainer     *container,
1893                               GList            *children,
1894                               GtkDirectionType  direction,
1895                               GtkWidget        *old_focus)
1896 {
1897   GtkTextDirection text_direction = gtk_widget_get_direction (GTK_WIDGET (container));
1898   children = g_list_sort_with_data (children, tab_compare, GINT_TO_POINTER (text_direction));
1899
1900   /* if we are going backwards then reverse the order
1901    *  of the children.
1902    */
1903   if (direction == GTK_DIR_TAB_BACKWARD)
1904     children = g_list_reverse (children);
1905
1906   return children;
1907 }
1908
1909 /* Get coordinates of @widget's allocation with respect to
1910  * allocation of @container.
1911  */
1912 static gboolean
1913 get_allocation_coords (GtkContainer  *container,
1914                        GtkWidget     *widget,
1915                        GdkRectangle  *allocation)
1916 {
1917   gtk_widget_set_allocation (widget, allocation);
1918
1919   return gtk_widget_translate_coordinates (widget, GTK_WIDGET (container),
1920                                            0, 0, &allocation->x, &allocation->y);
1921 }
1922
1923 /* Look for a child in @children that is intermediate between
1924  * the focus widget and container. This widget, if it exists,
1925  * acts as the starting widget for focus navigation.
1926  */
1927 static GtkWidget *
1928 find_old_focus (GtkContainer *container,
1929                 GList        *children)
1930 {
1931   GList *tmp_list = children;
1932   while (tmp_list)
1933     {
1934       GtkWidget *child = tmp_list->data;
1935       GtkWidget *widget = child;
1936
1937       while (widget && widget != (GtkWidget *)container)
1938         {
1939           GtkWidget *parent;
1940
1941           parent = gtk_widget_get_parent (widget);
1942
1943           if (parent && (gtk_container_get_focus_child (GTK_CONTAINER (parent)) != widget))
1944             goto next;
1945
1946           widget = parent;
1947         }
1948
1949       return child;
1950
1951     next:
1952       tmp_list = tmp_list->next;
1953     }
1954
1955   return NULL;
1956 }
1957
1958 static gboolean
1959 old_focus_coords (GtkContainer *container,
1960                   GdkRectangle *old_focus_rect)
1961 {
1962   GtkWidget *widget = GTK_WIDGET (container);
1963   GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
1964   GtkWidget *old_focus;
1965
1966   if (GTK_IS_WINDOW (toplevel))
1967     {
1968       old_focus = gtk_window_get_focus (GTK_WINDOW (toplevel));
1969       if (old_focus)
1970         return get_allocation_coords (container, old_focus, old_focus_rect);
1971     }
1972
1973   return FALSE;
1974 }
1975
1976 typedef struct _CompareInfo CompareInfo;
1977
1978 struct _CompareInfo
1979 {
1980   GtkContainer *container;
1981   gint x;
1982   gint y;
1983   gboolean reverse;
1984 };
1985
1986 static gint
1987 up_down_compare (gconstpointer a,
1988                  gconstpointer b,
1989                  gpointer      data)
1990 {
1991   GdkRectangle allocation1;
1992   GdkRectangle allocation2;
1993   CompareInfo *compare = data;
1994   gint y1, y2;
1995
1996   get_allocation_coords (compare->container, (GtkWidget *)a, &allocation1);
1997   get_allocation_coords (compare->container, (GtkWidget *)b, &allocation2);
1998
1999   y1 = allocation1.y + allocation1.height / 2;
2000   y2 = allocation2.y + allocation2.height / 2;
2001
2002   if (y1 == y2)
2003     {
2004       gint x1 = abs (allocation1.x + allocation1.width / 2 - compare->x);
2005       gint x2 = abs (allocation2.x + allocation2.width / 2 - compare->x);
2006
2007       if (compare->reverse)
2008         return (x1 < x2) ? 1 : ((x1 == x2) ? 0 : -1);
2009       else
2010         return (x1 < x2) ? -1 : ((x1 == x2) ? 0 : 1);
2011     }
2012   else
2013     return (y1 < y2) ? -1 : 1;
2014 }
2015
2016 static GList *
2017 gtk_container_focus_sort_up_down (GtkContainer     *container,
2018                                   GList            *children,
2019                                   GtkDirectionType  direction,
2020                                   GtkWidget        *old_focus)
2021 {
2022   CompareInfo compare;
2023   GList *tmp_list;
2024   GdkRectangle old_allocation;
2025
2026   compare.container = container;
2027   compare.reverse = (direction == GTK_DIR_UP);
2028
2029   if (!old_focus)
2030       old_focus = find_old_focus (container, children);
2031
2032   if (old_focus && get_allocation_coords (container, old_focus, &old_allocation))
2033     {
2034       gint compare_x1;
2035       gint compare_x2;
2036       gint compare_y;
2037
2038       /* Delete widgets from list that don't match minimum criteria */
2039
2040       compare_x1 = old_allocation.x;
2041       compare_x2 = old_allocation.x + old_allocation.width;
2042
2043       if (direction == GTK_DIR_UP)
2044         compare_y = old_allocation.y;
2045       else
2046         compare_y = old_allocation.y + old_allocation.height;
2047
2048       tmp_list = children;
2049       while (tmp_list)
2050         {
2051           GtkWidget *child = tmp_list->data;
2052           GList *next = tmp_list->next;
2053           gint child_x1, child_x2;
2054           GdkRectangle child_allocation;
2055
2056           if (child != old_focus)
2057             {
2058               if (get_allocation_coords (container, child, &child_allocation))
2059                 {
2060                   child_x1 = child_allocation.x;
2061                   child_x2 = child_allocation.x + child_allocation.width;
2062
2063                   if ((child_x2 <= compare_x1 || child_x1 >= compare_x2) /* No horizontal overlap */ ||
2064                       (direction == GTK_DIR_DOWN && child_allocation.y + child_allocation.height < compare_y) || /* Not below */
2065                       (direction == GTK_DIR_UP && child_allocation.y > compare_y)) /* Not above */
2066                     {
2067                       children = g_list_delete_link (children, tmp_list);
2068                     }
2069                 }
2070               else
2071                 children = g_list_delete_link (children, tmp_list);
2072             }
2073
2074           tmp_list = next;
2075         }
2076
2077       compare.x = (compare_x1 + compare_x2) / 2;
2078       compare.y = old_allocation.y + old_allocation.height / 2;
2079     }
2080   else
2081     {
2082       /* No old focus widget, need to figure out starting x,y some other way
2083        */
2084       GtkAllocation allocation;
2085       GtkWidget *widget = GTK_WIDGET (container);
2086       GdkRectangle old_focus_rect;
2087
2088       gtk_widget_get_allocation (widget, &allocation);
2089
2090       if (old_focus_coords (container, &old_focus_rect))
2091         {
2092           compare.x = old_focus_rect.x + old_focus_rect.width / 2;
2093         }
2094       else
2095         {
2096           if (!gtk_widget_get_has_window (widget))
2097             compare.x = allocation.x + allocation.width / 2;
2098           else
2099             compare.x = allocation.width / 2;
2100         }
2101
2102       if (!gtk_widget_get_has_window (widget))
2103         compare.y = (direction == GTK_DIR_DOWN) ? allocation.y : allocation.y + allocation.height;
2104       else
2105         compare.y = (direction == GTK_DIR_DOWN) ? 0 : + allocation.height;
2106     }
2107
2108   children = g_list_sort_with_data (children, up_down_compare, &compare);
2109
2110   if (compare.reverse)
2111     children = g_list_reverse (children);
2112
2113   return children;
2114 }
2115
2116 static gint
2117 left_right_compare (gconstpointer a,
2118                     gconstpointer b,
2119                     gpointer      data)
2120 {
2121   GdkRectangle allocation1;
2122   GdkRectangle allocation2;
2123   CompareInfo *compare = data;
2124   gint x1, x2;
2125
2126   get_allocation_coords (compare->container, (GtkWidget *)a, &allocation1);
2127   get_allocation_coords (compare->container, (GtkWidget *)b, &allocation2);
2128
2129   x1 = allocation1.x + allocation1.width / 2;
2130   x2 = allocation2.x + allocation2.width / 2;
2131
2132   if (x1 == x2)
2133     {
2134       gint y1 = abs (allocation1.y + allocation1.height / 2 - compare->y);
2135       gint y2 = abs (allocation2.y + allocation2.height / 2 - compare->y);
2136
2137       if (compare->reverse)
2138         return (y1 < y2) ? 1 : ((y1 == y2) ? 0 : -1);
2139       else
2140         return (y1 < y2) ? -1 : ((y1 == y2) ? 0 : 1);
2141     }
2142   else
2143     return (x1 < x2) ? -1 : 1;
2144 }
2145
2146 static GList *
2147 gtk_container_focus_sort_left_right (GtkContainer     *container,
2148                                      GList            *children,
2149                                      GtkDirectionType  direction,
2150                                      GtkWidget        *old_focus)
2151 {
2152   CompareInfo compare;
2153   GList *tmp_list;
2154   GdkRectangle old_allocation;
2155
2156   compare.container = container;
2157   compare.reverse = (direction == GTK_DIR_LEFT);
2158
2159   if (!old_focus)
2160     old_focus = find_old_focus (container, children);
2161
2162   if (old_focus && get_allocation_coords (container, old_focus, &old_allocation))
2163     {
2164       gint compare_y1;
2165       gint compare_y2;
2166       gint compare_x;
2167
2168       /* Delete widgets from list that don't match minimum criteria */
2169
2170       compare_y1 = old_allocation.y;
2171       compare_y2 = old_allocation.y + old_allocation.height;
2172
2173       if (direction == GTK_DIR_LEFT)
2174         compare_x = old_allocation.x;
2175       else
2176         compare_x = old_allocation.x + old_allocation.width;
2177
2178       tmp_list = children;
2179       while (tmp_list)
2180         {
2181           GtkWidget *child = tmp_list->data;
2182           GList *next = tmp_list->next;
2183           gint child_y1, child_y2;
2184           GdkRectangle child_allocation;
2185
2186           if (child != old_focus)
2187             {
2188               if (get_allocation_coords (container, child, &child_allocation))
2189                 {
2190                   child_y1 = child_allocation.y;
2191                   child_y2 = child_allocation.y + child_allocation.height;
2192
2193                   if ((child_y2 <= compare_y1 || child_y1 >= compare_y2) /* No vertical overlap */ ||
2194                       (direction == GTK_DIR_RIGHT && child_allocation.x + child_allocation.width < compare_x) || /* Not to left */
2195                       (direction == GTK_DIR_LEFT && child_allocation.x > compare_x)) /* Not to right */
2196                     {
2197                       children = g_list_delete_link (children, tmp_list);
2198                     }
2199                 }
2200               else
2201                 children = g_list_delete_link (children, tmp_list);
2202             }
2203
2204           tmp_list = next;
2205         }
2206
2207       compare.y = (compare_y1 + compare_y2) / 2;
2208       compare.x = old_allocation.x + old_allocation.width / 2;
2209     }
2210   else
2211     {
2212       /* No old focus widget, need to figure out starting x,y some other way
2213        */
2214       GtkAllocation allocation;
2215       GtkWidget *widget = GTK_WIDGET (container);
2216       GdkRectangle old_focus_rect;
2217
2218       gtk_widget_get_allocation (widget, &allocation);
2219
2220       if (old_focus_coords (container, &old_focus_rect))
2221         {
2222           compare.y = old_focus_rect.y + old_focus_rect.height / 2;
2223         }
2224       else
2225         {
2226           if (!gtk_widget_get_has_window (widget))
2227             compare.y = allocation.y + allocation.height / 2;
2228           else
2229             compare.y = allocation.height / 2;
2230         }
2231
2232       if (!gtk_widget_get_has_window (widget))
2233         compare.x = (direction == GTK_DIR_RIGHT) ? allocation.x : allocation.x + allocation.width;
2234       else
2235         compare.x = (direction == GTK_DIR_RIGHT) ? 0 : allocation.width;
2236     }
2237
2238   children = g_list_sort_with_data (children, left_right_compare, &compare);
2239
2240   if (compare.reverse)
2241     children = g_list_reverse (children);
2242
2243   return children;
2244 }
2245
2246 /**
2247  * gtk_container_focus_sort:
2248  * @container: a #GtkContainer
2249  * @children:  a list of descendents of @container (they don't
2250  *             have to be direct children)
2251  * @direction: focus direction
2252  * @old_focus: (allow-none): widget to use for the starting position, or %NULL
2253  *             to determine this automatically.
2254  *             (Note, this argument isn't used for GTK_DIR_TAB_*,
2255  *              which is the only @direction we use currently,
2256  *              so perhaps this argument should be removed)
2257  *
2258  * Sorts @children in the correct order for focusing with
2259  * direction type @direction.
2260  *
2261  * Return value: a copy of @children, sorted in correct focusing order,
2262  *   with children that aren't suitable for focusing in this direction
2263  *   removed.
2264  **/
2265 GList *
2266 _gtk_container_focus_sort (GtkContainer     *container,
2267                            GList            *children,
2268                            GtkDirectionType  direction,
2269                            GtkWidget        *old_focus)
2270 {
2271   GList *visible_children = NULL;
2272
2273   while (children)
2274     {
2275       if (gtk_widget_get_realized (children->data))
2276         visible_children = g_list_prepend (visible_children, children->data);
2277       children = children->next;
2278     }
2279
2280   switch (direction)
2281     {
2282     case GTK_DIR_TAB_FORWARD:
2283     case GTK_DIR_TAB_BACKWARD:
2284       return gtk_container_focus_sort_tab (container, visible_children, direction, old_focus);
2285     case GTK_DIR_UP:
2286     case GTK_DIR_DOWN:
2287       return gtk_container_focus_sort_up_down (container, visible_children, direction, old_focus);
2288     case GTK_DIR_LEFT:
2289     case GTK_DIR_RIGHT:
2290       return gtk_container_focus_sort_left_right (container, visible_children, direction, old_focus);
2291     }
2292
2293   g_assert_not_reached ();
2294
2295   return NULL;
2296 }
2297
2298 static gboolean
2299 gtk_container_focus_move (GtkContainer     *container,
2300                           GList            *children,
2301                           GtkDirectionType  direction)
2302 {
2303   GtkContainerPrivate *priv = container->priv;
2304   GtkWidget *focus_child;
2305   GtkWidget *child;
2306
2307   focus_child = priv->focus_child;
2308
2309   while (children)
2310     {
2311       child = children->data;
2312       children = children->next;
2313
2314       if (!child)
2315         continue;
2316
2317       if (focus_child)
2318         {
2319           if (focus_child == child)
2320             {
2321               focus_child = NULL;
2322
2323                 if (gtk_widget_child_focus (child, direction))
2324                   return TRUE;
2325             }
2326         }
2327       else if (gtk_widget_is_drawable (child) &&
2328                gtk_widget_is_ancestor (child, GTK_WIDGET (container)))
2329         {
2330           if (gtk_widget_child_focus (child, direction))
2331             return TRUE;
2332         }
2333     }
2334
2335   return FALSE;
2336 }
2337
2338
2339 static void
2340 gtk_container_children_callback (GtkWidget *widget,
2341                                  gpointer   client_data)
2342 {
2343   GList **children;
2344
2345   children = (GList**) client_data;
2346   *children = g_list_prepend (*children, widget);
2347 }
2348
2349 static void
2350 chain_widget_destroyed (GtkWidget *widget,
2351                         gpointer   user_data)
2352 {
2353   GtkContainer *container;
2354   GList *chain;
2355
2356   container = GTK_CONTAINER (user_data);
2357
2358   chain = g_object_get_data (G_OBJECT (container),
2359                              "gtk-container-focus-chain");
2360
2361   chain = g_list_remove (chain, widget);
2362
2363   g_signal_handlers_disconnect_by_func (widget,
2364                                         chain_widget_destroyed,
2365                                         user_data);
2366
2367   g_object_set_data (G_OBJECT (container),
2368                      I_("gtk-container-focus-chain"),
2369                      chain);
2370 }
2371
2372 /**
2373  * gtk_container_set_focus_chain:
2374  * @container: a #GtkContainer
2375  * @focusable_widgets: the new focus chain
2376  *
2377  * Sets a focus chain, overriding the one computed automatically by GTK+.
2378  *
2379  * In principle each widget in the chain should be a descendant of the
2380  * container, but this is not enforced by this method, since it's allowed
2381  * to set the focus chain before you pack the widgets, or have a widget
2382  * in the chain that isn't always packed. The necessary checks are done
2383  * when the focus chain is actually traversed.
2384  **/
2385 void
2386 gtk_container_set_focus_chain (GtkContainer *container,
2387                                GList        *focusable_widgets)
2388 {
2389   GList *chain;
2390   GList *tmp_list;
2391   GtkContainerPrivate *priv;
2392
2393   g_return_if_fail (GTK_IS_CONTAINER (container));
2394
2395   priv = container->priv;
2396
2397   if (priv->has_focus_chain)
2398     gtk_container_unset_focus_chain (container);
2399
2400   priv->has_focus_chain = TRUE;
2401
2402   chain = NULL;
2403   tmp_list = focusable_widgets;
2404   while (tmp_list != NULL)
2405     {
2406       g_return_if_fail (GTK_IS_WIDGET (tmp_list->data));
2407
2408       /* In principle each widget in the chain should be a descendant
2409        * of the container, but we don't want to check that here, it's
2410        * expensive and also it's allowed to set the focus chain before
2411        * you pack the widgets, or have a widget in the chain that isn't
2412        * always packed. So we check for ancestor during actual traversal.
2413        */
2414
2415       chain = g_list_prepend (chain, tmp_list->data);
2416
2417       g_signal_connect (tmp_list->data,
2418                         "destroy",
2419                         G_CALLBACK (chain_widget_destroyed),
2420                         container);
2421
2422       tmp_list = g_list_next (tmp_list);
2423     }
2424
2425   chain = g_list_reverse (chain);
2426
2427   g_object_set_data (G_OBJECT (container),
2428                      I_("gtk-container-focus-chain"),
2429                      chain);
2430 }
2431
2432 /**
2433  * gtk_container_get_focus_chain:
2434  * @container:         a #GtkContainer
2435  * @focusable_widgets: (element-type GtkWidget) (out) (transfer container): location
2436  *                     to store the focus chain of the
2437  *                     container, or %NULL. You should free this list
2438  *                     using g_list_free() when you are done with it, however
2439  *                     no additional reference count is added to the
2440  *                     individual widgets in the focus chain.
2441  *
2442  * Retrieves the focus chain of the container, if one has been
2443  * set explicitly. If no focus chain has been explicitly
2444  * set, GTK+ computes the focus chain based on the positions
2445  * of the children. In that case, GTK+ stores %NULL in
2446  * @focusable_widgets and returns %FALSE.
2447  *
2448  * Return value: %TRUE if the focus chain of the container
2449  * has been set explicitly.
2450  **/
2451 gboolean
2452 gtk_container_get_focus_chain (GtkContainer *container,
2453                                GList       **focus_chain)
2454 {
2455   GtkContainerPrivate *priv;
2456
2457   g_return_val_if_fail (GTK_IS_CONTAINER (container), FALSE);
2458
2459   priv = container->priv;
2460
2461   if (focus_chain)
2462     {
2463       if (priv->has_focus_chain)
2464         *focus_chain = g_list_copy (get_focus_chain (container));
2465       else
2466         *focus_chain = NULL;
2467     }
2468
2469   return priv->has_focus_chain;
2470 }
2471
2472 /**
2473  * gtk_container_unset_focus_chain:
2474  * @container: a #GtkContainer
2475  *
2476  * Removes a focus chain explicitly set with gtk_container_set_focus_chain().
2477  **/
2478 void
2479 gtk_container_unset_focus_chain (GtkContainer  *container)
2480 {
2481   GtkContainerPrivate *priv;
2482
2483   g_return_if_fail (GTK_IS_CONTAINER (container));
2484
2485   priv = container->priv;
2486
2487   if (priv->has_focus_chain)
2488     {
2489       GList *chain;
2490       GList *tmp_list;
2491
2492       chain = get_focus_chain (container);
2493
2494       priv->has_focus_chain = FALSE;
2495
2496       g_object_set_data (G_OBJECT (container),
2497                          I_("gtk-container-focus-chain"),
2498                          NULL);
2499
2500       tmp_list = chain;
2501       while (tmp_list != NULL)
2502         {
2503           g_signal_handlers_disconnect_by_func (tmp_list->data,
2504                                                 chain_widget_destroyed,
2505                                                 container);
2506
2507           tmp_list = g_list_next (tmp_list);
2508         }
2509
2510       g_list_free (chain);
2511     }
2512 }
2513
2514 /**
2515  * gtk_container_set_focus_vadjustment:
2516  * @container: a #GtkContainer
2517  * @adjustment: an adjustment which should be adjusted when the focus
2518  *   is moved among the descendents of @container
2519  *
2520  * Hooks up an adjustment to focus handling in a container, so when a
2521  * child of the container is focused, the adjustment is scrolled to
2522  * show that widget. This function sets the vertical alignment. See
2523  * gtk_scrolled_window_get_vadjustment() for a typical way of obtaining
2524  * the adjustment and gtk_container_set_focus_hadjustment() for setting
2525  * the horizontal adjustment.
2526  *
2527  * The adjustments have to be in pixel units and in the same coordinate
2528  * system as the allocation for immediate children of the container.
2529  */
2530 void
2531 gtk_container_set_focus_vadjustment (GtkContainer  *container,
2532                                      GtkAdjustment *adjustment)
2533 {
2534   g_return_if_fail (GTK_IS_CONTAINER (container));
2535   if (adjustment)
2536     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
2537
2538   if (adjustment)
2539     g_object_ref (adjustment);
2540
2541   g_object_set_qdata_full (G_OBJECT (container),
2542                            vadjustment_key_id,
2543                            adjustment,
2544                            g_object_unref);
2545 }
2546
2547 /**
2548  * gtk_container_get_focus_vadjustment:
2549  * @container: a #GtkContainer
2550  *
2551  * Retrieves the vertical focus adjustment for the container. See
2552  * gtk_container_set_focus_vadjustment().
2553  *
2554  * Return value: (transfer none): the vertical focus adjustment, or %NULL if
2555  *   none has been set.
2556  **/
2557 GtkAdjustment *
2558 gtk_container_get_focus_vadjustment (GtkContainer *container)
2559 {
2560   GtkAdjustment *vadjustment;
2561
2562   g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL);
2563
2564   vadjustment = g_object_get_qdata (G_OBJECT (container), vadjustment_key_id);
2565
2566   return vadjustment;
2567 }
2568
2569 /**
2570  * gtk_container_set_focus_hadjustment:
2571  * @container: a #GtkContainer
2572  * @adjustment: an adjustment which should be adjusted when the focus is
2573  *   moved among the descendents of @container
2574  *
2575  * Hooks up an adjustment to focus handling in a container, so when a child
2576  * of the container is focused, the adjustment is scrolled to show that
2577  * widget. This function sets the horizontal alignment.
2578  * See gtk_scrolled_window_get_hadjustment() for a typical way of obtaining
2579  * the adjustment and gtk_container_set_focus_vadjustment() for setting
2580  * the vertical adjustment.
2581  *
2582  * The adjustments have to be in pixel units and in the same coordinate
2583  * system as the allocation for immediate children of the container.
2584  */
2585 void
2586 gtk_container_set_focus_hadjustment (GtkContainer  *container,
2587                                      GtkAdjustment *adjustment)
2588 {
2589   g_return_if_fail (GTK_IS_CONTAINER (container));
2590   if (adjustment)
2591     g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
2592
2593   if (adjustment)
2594     g_object_ref (adjustment);
2595
2596   g_object_set_qdata_full (G_OBJECT (container),
2597                            hadjustment_key_id,
2598                            adjustment,
2599                            g_object_unref);
2600 }
2601
2602 /**
2603  * gtk_container_get_focus_hadjustment:
2604  * @container: a #GtkContainer
2605  *
2606  * Retrieves the horizontal focus adjustment for the container. See
2607  * gtk_container_set_focus_hadjustment ().
2608  *
2609  * Return value: (transfer none): the horizontal focus adjustment, or %NULL if
2610  *   none has been set.
2611  **/
2612 GtkAdjustment *
2613 gtk_container_get_focus_hadjustment (GtkContainer *container)
2614 {
2615   GtkAdjustment *hadjustment;
2616
2617   g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL);
2618
2619   hadjustment = g_object_get_qdata (G_OBJECT (container), hadjustment_key_id);
2620
2621   return hadjustment;
2622 }
2623
2624
2625 static void
2626 gtk_container_show_all (GtkWidget *widget)
2627 {
2628   g_return_if_fail (GTK_IS_CONTAINER (widget));
2629
2630   gtk_container_foreach (GTK_CONTAINER (widget),
2631                          (GtkCallback) gtk_widget_show_all,
2632                          NULL);
2633   gtk_widget_show (widget);
2634 }
2635
2636 static void
2637 gtk_container_hide_all (GtkWidget *widget)
2638 {
2639   g_return_if_fail (GTK_IS_CONTAINER (widget));
2640
2641   gtk_widget_hide (widget);
2642   gtk_container_foreach (GTK_CONTAINER (widget),
2643                          (GtkCallback) gtk_widget_hide_all,
2644                          NULL);
2645 }
2646
2647
2648 static void
2649 gtk_container_expose_child (GtkWidget *child,
2650                             gpointer   client_data)
2651 {
2652   struct {
2653     GtkWidget *container;
2654     GdkEventExpose *event;
2655   } *data = client_data;
2656
2657   gtk_container_propagate_expose (GTK_CONTAINER (data->container),
2658                                   child,
2659                                   data->event);
2660 }
2661
2662 static gint
2663 gtk_container_expose (GtkWidget      *widget,
2664                       GdkEventExpose *event)
2665 {
2666   struct {
2667     GtkWidget *container;
2668     GdkEventExpose *event;
2669   } data;
2670
2671   g_return_val_if_fail (GTK_IS_CONTAINER (widget), FALSE);
2672   g_return_val_if_fail (event != NULL, FALSE);
2673
2674
2675   if (gtk_widget_is_drawable (widget))
2676     {
2677       data.container = widget;
2678       data.event = event;
2679
2680       gtk_container_forall (GTK_CONTAINER (widget),
2681                             gtk_container_expose_child,
2682                             &data);
2683     }
2684
2685   return FALSE;
2686 }
2687
2688 static void
2689 gtk_container_map_child (GtkWidget *child,
2690                          gpointer   client_data)
2691 {
2692   if (gtk_widget_get_visible (child) &&
2693       gtk_widget_get_child_visible (child) &&
2694       !gtk_widget_get_mapped (child))
2695     gtk_widget_map (child);
2696 }
2697
2698 static void
2699 gtk_container_map (GtkWidget *widget)
2700 {
2701   gtk_widget_set_mapped (widget, TRUE);
2702
2703   gtk_container_forall (GTK_CONTAINER (widget),
2704                         gtk_container_map_child,
2705                         NULL);
2706
2707   if (gtk_widget_get_has_window (widget))
2708     gdk_window_show (gtk_widget_get_window (widget));
2709 }
2710
2711 static void
2712 gtk_container_unmap (GtkWidget *widget)
2713 {
2714   gtk_widget_set_mapped (widget, FALSE);
2715
2716   if (gtk_widget_get_has_window (widget))
2717     gdk_window_hide (gtk_widget_get_window (widget));
2718   else
2719     gtk_container_forall (GTK_CONTAINER (widget),
2720                           (GtkCallback)gtk_widget_unmap,
2721                           NULL);
2722 }
2723
2724 /**
2725  * gtk_container_propagate_expose:
2726  * @container: a #GtkContainer
2727  * @child: a child of @container
2728  * @event: a expose event sent to container
2729  *
2730  * When a container receives an expose event, it must send synthetic
2731  * expose events to all children that don't have their own #GdkWindows.
2732  * This function provides a convenient way of doing this. A container,
2733  * when it receives an expose event, calls gtk_container_propagate_expose()
2734  * once for each child, passing in the event the container received.
2735  *
2736  * gtk_container_propagate_expose() takes care of deciding whether
2737  * an expose event needs to be sent to the child, intersecting
2738  * the event's area with the child area, and sending the event.
2739  *
2740  * In most cases, a container can simply either simply inherit the
2741  * #GtkWidget::expose implementation from #GtkContainer, or, do some drawing
2742  * and then chain to the ::expose implementation from #GtkContainer.
2743  **/
2744 void
2745 gtk_container_propagate_expose (GtkContainer   *container,
2746                                 GtkWidget      *child,
2747                                 GdkEventExpose *event)
2748 {
2749   GdkEvent *child_event;
2750
2751   g_return_if_fail (GTK_IS_CONTAINER (container));
2752   g_return_if_fail (GTK_IS_WIDGET (child));
2753   g_return_if_fail (event != NULL);
2754
2755   g_assert (gtk_widget_get_parent (child) == GTK_WIDGET (container));
2756
2757   if (gtk_widget_is_drawable (child) &&
2758       !gtk_widget_get_has_window (child) &&
2759       gtk_widget_get_window (child) == event->window)
2760     {
2761       child_event = gdk_event_new (GDK_EXPOSE);
2762       child_event->expose = *event;
2763       g_object_ref (child_event->expose.window);
2764
2765       child_event->expose.region = gtk_widget_region_intersect (child, event->region);
2766       if (!cairo_region_is_empty (child_event->expose.region))
2767         {
2768           cairo_region_get_extents (child_event->expose.region, &child_event->expose.area);
2769           gtk_widget_send_expose (child, child_event);
2770         }
2771       gdk_event_free (child_event);
2772     }
2773 }
2774
2775 gboolean
2776 _gtk_container_get_need_resize (GtkContainer *container)
2777 {
2778   return container->priv->need_resize;
2779 }
2780
2781 void
2782 _gtk_container_set_need_resize (GtkContainer *container,
2783                                 gboolean      need_resize)
2784 {
2785   container->priv->need_resize = need_resize;
2786 }
2787
2788 gboolean
2789 _gtk_container_get_reallocate_redraws (GtkContainer *container)
2790 {
2791   return container->priv->reallocate_redraws;
2792 }