/* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library. If not, see . */ /* * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include "config.h" #include "gtkcontainerprivate.h" #include "gtkadjustment.h" #include "gtkassistant.h" #include "gtkbuildable.h" #include "gtkbuilderprivate.h" #include "gtkintl.h" #include "gtkpopovermenu.h" #include "gtkprivate.h" #include "gtkmarshalers.h" #include "gtkshortcutssection.h" #include "gtkshortcutswindow.h" #include "gtksizerequest.h" #include "gtkstylecontextprivate.h" #include "gtktypebuiltins.h" #include "gtkwidgetprivate.h" #include "gtkwindow.h" #include "a11y/gtkcontaineraccessibleprivate.h" #include #include #include #include #include /* A handful of containers inside GTK+ are cheating and widgets * inside internal structure as direct children for the purpose * of forall(). */ #define SPECIAL_CONTAINER(x) (GTK_IS_ASSISTANT (x) || \ GTK_IS_POPOVER_MENU (x) || \ GTK_IS_SHORTCUTS_SECTION (x) || \ GTK_IS_SHORTCUTS_WINDOW (x)) /** * SECTION:gtkcontainer * @Short_description: Base class for widgets which contain other widgets * @Title: GtkContainer * * A GTK+ user interface is constructed by nesting widgets inside widgets. * Container widgets are the inner nodes in the resulting tree of widgets: * they contain other widgets. So, for example, you might have a #GtkWindow * containing a #GtkFrame containing a #GtkLabel. If you wanted an image instead * of a textual label inside the frame, you might replace the #GtkLabel widget * with a #GtkImage widget. * * There are two major kinds of container widgets in GTK+. Both are subclasses * of the abstract GtkContainer base class. * * The first type of container widget has a single child widget and derives * from #GtkBin. These containers are decorators, which * add some kind of functionality to the child. For example, a #GtkButton makes * its child into a clickable button; a #GtkFrame draws a frame around its child * and a #GtkWindow places its child widget inside a top-level window. * * The second type of container can have more than one child; its purpose is to * manage layout. This means that these containers assign * sizes and positions to their children. For example, a horizontal #GtkBox arranges its * children in a horizontal row, and a #GtkGrid arranges the widgets it contains * in a two-dimensional grid. * * For implementations of #GtkContainer the virtual method #GtkContainerClass.forall() * is always required, since it's used for drawing and other internal operations * on the children. * If the #GtkContainer implementation expect to have non internal children * it's needed to implement both #GtkContainerClass.add() and #GtkContainerClass.remove(). * If the GtkContainer implementation has internal children, they should be added * with gtk_widget_set_parent() on init() and removed with gtk_widget_unparent() * in the #GtkWidgetClass.destroy() implementation. * See more about implementing custom widgets at https://wiki.gnome.org/HowDoI/CustomWidgets * * # Child properties * * GtkContainer introduces child properties. * These are object properties that are not specific * to either the container or the contained widget, but rather to their relation. * Typical examples of child properties are the position or pack-type of a widget * which is contained in a #GtkBox. * * Use gtk_container_class_install_child_property() to install child properties * for a container class and gtk_container_class_find_child_property() or * gtk_container_class_list_child_properties() to get information about existing * child properties. * * To set the value of a child property, use gtk_container_child_set_property(), * gtk_container_child_set() or gtk_container_child_set_valist(). * To obtain the value of a child property, use * gtk_container_child_get_property(), gtk_container_child_get() or * gtk_container_child_get_valist(). To emit notification about child property * changes, use gtk_widget_child_notify(). * * # GtkContainer as GtkBuildable * * The GtkContainer implementation of the GtkBuildable interface supports * a element for children, which can contain multiple * elements that specify child properties for the child. * * Since 2.16, child properties can also be marked as translatable using * the same “translatable”, “comments” and “context” attributes that are used * for regular properties. * * Since 3.16, containers can have a element containing multiple * elements, one for each child that should be added to the focus * chain. The ”name” attribute gives the id of the widget. * * An example of these properties in UI definitions: * |[ * * * * * start * * * * * * * * * * * ]| * */ struct _GtkContainerPrivate { GdkFrameClock *resize_clock; guint resize_handler; guint has_focus_chain : 1; guint restyle_pending : 1; guint request_mode : 2; }; enum { ADD, REMOVE, CHECK_RESIZE, SET_FOCUS_CHILD, LAST_SIGNAL }; #define PARAM_SPEC_PARAM_ID(pspec) ((pspec)->param_id) #define PARAM_SPEC_SET_PARAM_ID(pspec, id) ((pspec)->param_id = (id)) /* --- prototypes --- */ static void gtk_container_base_class_init (GtkContainerClass *klass); static void gtk_container_base_class_finalize (GtkContainerClass *klass); static void gtk_container_class_init (GtkContainerClass *klass); static void gtk_container_init (GtkContainer *container); static void gtk_container_destroy (GtkWidget *widget); static void gtk_container_add_unimplemented (GtkContainer *container, GtkWidget *widget); static void gtk_container_remove_unimplemented (GtkContainer *container, GtkWidget *widget); static void gtk_container_real_check_resize (GtkContainer *container); static void gtk_container_compute_expand (GtkWidget *widget, gboolean *hexpand_p, gboolean *vexpand_p); static gboolean gtk_container_focus (GtkWidget *widget, GtkDirectionType direction); static void gtk_container_real_set_focus_child (GtkContainer *container, GtkWidget *widget); static gboolean gtk_container_focus_move (GtkContainer *container, GList *children, GtkDirectionType direction); static void gtk_container_children_callback (GtkWidget *widget, gpointer client_data); static GtkSizeRequestMode gtk_container_get_request_mode (GtkWidget *widget); static GtkWidgetPath * gtk_container_real_get_path_for_child (GtkContainer *container, GtkWidget *child); /* GtkBuildable */ static void gtk_container_buildable_init (GtkBuildableIface *iface); static void gtk_container_buildable_add_child (GtkBuildable *buildable, GtkBuilder *builder, GObject *child, const gchar *type); static gboolean gtk_container_buildable_custom_tag_start (GtkBuildable *buildable, GtkBuilder *builder, GObject *child, const gchar *tagname, GMarkupParser *parser, gpointer *data); static void gtk_container_buildable_custom_tag_end (GtkBuildable *buildable, GtkBuilder *builder, GObject *child, const gchar *tagname, gpointer *data); static void gtk_container_buildable_custom_finished (GtkBuildable *buildable, GtkBuilder *builder, GObject *child, const gchar *tagname, gpointer data); /* --- variables --- */ static GQuark vadjustment_key_id; static GQuark hadjustment_key_id; static GQuark quark_focus_chain; static guint container_signals[LAST_SIGNAL] = { 0 }; static gint GtkContainer_private_offset; static GtkWidgetClass *parent_class = NULL; extern GParamSpecPool *_gtk_widget_child_property_pool; extern GObjectNotifyContext *_gtk_widget_child_property_notify_context; static GtkBuildableIface *parent_buildable_iface; /* --- functions --- */ static inline gpointer gtk_container_get_instance_private (GtkContainer *self) { return G_STRUCT_MEMBER_P (self, GtkContainer_private_offset); } GType gtk_container_get_type (void) { static GType container_type = 0; if (!container_type) { const GTypeInfo container_info = { sizeof (GtkContainerClass), (GBaseInitFunc) gtk_container_base_class_init, (GBaseFinalizeFunc) gtk_container_base_class_finalize, (GClassInitFunc) gtk_container_class_init, NULL /* class_finalize */, NULL /* class_data */, sizeof (GtkContainer), 0 /* n_preallocs */, (GInstanceInitFunc) gtk_container_init, NULL, /* value_table */ }; const GInterfaceInfo buildable_info = { (GInterfaceInitFunc) gtk_container_buildable_init, NULL, NULL }; container_type = g_type_register_static (GTK_TYPE_WIDGET, I_("GtkContainer"), &container_info, G_TYPE_FLAG_ABSTRACT); GtkContainer_private_offset = g_type_add_instance_private (container_type, sizeof (GtkContainerPrivate)); g_type_add_interface_static (container_type, GTK_TYPE_BUILDABLE, &buildable_info); } return container_type; } static void gtk_container_base_class_init (GtkContainerClass *class) { /* reset instance specifc class fields that don't get inherited */ class->set_child_property = NULL; class->get_child_property = NULL; } static void gtk_container_base_class_finalize (GtkContainerClass *class) { GList *list, *node; list = g_param_spec_pool_list_owned (_gtk_widget_child_property_pool, G_OBJECT_CLASS_TYPE (class)); for (node = list; node; node = node->next) { GParamSpec *pspec = node->data; g_param_spec_pool_remove (_gtk_widget_child_property_pool, pspec); PARAM_SPEC_SET_PARAM_ID (pspec, 0); g_param_spec_unref (pspec); } g_list_free (list); } static void gtk_container_class_init (GtkContainerClass *class) { GObjectClass *gobject_class = G_OBJECT_CLASS (class); GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class); parent_class = g_type_class_peek_parent (class); vadjustment_key_id = g_quark_from_static_string ("gtk-vadjustment"); hadjustment_key_id = g_quark_from_static_string ("gtk-hadjustment"); quark_focus_chain = g_quark_from_static_string ("gtk-container-focus-chain"); widget_class->destroy = gtk_container_destroy; widget_class->compute_expand = gtk_container_compute_expand; widget_class->focus = gtk_container_focus; widget_class->get_request_mode = gtk_container_get_request_mode; class->add = gtk_container_add_unimplemented; class->remove = gtk_container_remove_unimplemented; class->check_resize = gtk_container_real_check_resize; class->forall = NULL; class->set_focus_child = gtk_container_real_set_focus_child; class->child_type = NULL; class->get_path_for_child = gtk_container_real_get_path_for_child; container_signals[ADD] = g_signal_new (I_("add"), G_OBJECT_CLASS_TYPE (gobject_class), G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GtkContainerClass, add), NULL, NULL, NULL, G_TYPE_NONE, 1, GTK_TYPE_WIDGET); container_signals[REMOVE] = g_signal_new (I_("remove"), G_OBJECT_CLASS_TYPE (gobject_class), G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GtkContainerClass, remove), NULL, NULL, NULL, G_TYPE_NONE, 1, GTK_TYPE_WIDGET); container_signals[CHECK_RESIZE] = g_signal_new (I_("check-resize"), G_OBJECT_CLASS_TYPE (gobject_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GtkContainerClass, check_resize), NULL, NULL, NULL, G_TYPE_NONE, 0); container_signals[SET_FOCUS_CHILD] = g_signal_new (I_("set-focus-child"), G_OBJECT_CLASS_TYPE (gobject_class), G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GtkContainerClass, set_focus_child), NULL, NULL, NULL, G_TYPE_NONE, 1, GTK_TYPE_WIDGET); if (GtkContainer_private_offset != 0) g_type_class_adjust_private_offset (class, &GtkContainer_private_offset); gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_CONTAINER_ACCESSIBLE); } static void gtk_container_buildable_init (GtkBuildableIface *iface) { parent_buildable_iface = g_type_interface_peek_parent (iface); iface->add_child = gtk_container_buildable_add_child; iface->custom_tag_start = gtk_container_buildable_custom_tag_start; iface->custom_tag_end = gtk_container_buildable_custom_tag_end; iface->custom_finished = gtk_container_buildable_custom_finished; } static void gtk_container_buildable_add_child (GtkBuildable *buildable, GtkBuilder *builder, GObject *child, const gchar *type) { if (type) { GTK_BUILDER_WARN_INVALID_CHILD_TYPE (buildable, type); } else if (GTK_IS_WIDGET (child) && _gtk_widget_get_parent (GTK_WIDGET (child)) == NULL) { gtk_container_add (GTK_CONTAINER (buildable), GTK_WIDGET (child)); } else g_warning ("Cannot add an object of type %s to a container of type %s", g_type_name (G_OBJECT_TYPE (child)), g_type_name (G_OBJECT_TYPE (buildable))); } static inline void container_set_child_property (GtkContainer *container, GtkWidget *child, GParamSpec *pspec, const GValue *value, GObjectNotifyQueue *nqueue) { GValue tmp_value = G_VALUE_INIT; GtkContainerClass *class = g_type_class_peek (pspec->owner_type); /* provide a copy to work from, convert (if necessary) and validate */ g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec)); if (!g_value_transform (value, &tmp_value)) g_warning ("unable to set child property '%s' of type '%s' from value of type '%s'", pspec->name, g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)), G_VALUE_TYPE_NAME (value)); else if (g_param_value_validate (pspec, &tmp_value) && !(pspec->flags & G_PARAM_LAX_VALIDATION)) { gchar *contents = g_strdup_value_contents (value); g_warning ("value \"%s\" of type '%s' is invalid for property '%s' of type '%s'", contents, G_VALUE_TYPE_NAME (value), pspec->name, g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec))); g_free (contents); } else { class->set_child_property (container, child, PARAM_SPEC_PARAM_ID (pspec), &tmp_value, pspec); g_object_notify_queue_add (G_OBJECT (child), nqueue, pspec); } g_value_unset (&tmp_value); } static void gtk_container_buildable_set_child_property (GtkContainer *container, GtkBuilder *builder, GtkWidget *child, gchar *name, const gchar *value) { GParamSpec *pspec; GValue gvalue = G_VALUE_INIT; GError *error = NULL; GObjectNotifyQueue *nqueue; if (SPECIAL_CONTAINER (container)) { /* This can happen with internal children of complex widgets. * Silently ignore the child properties in this case. We explicitly * allow it for GtkAssistant, since that is how it works. */ return; } pspec = gtk_container_class_find_child_property (G_OBJECT_GET_CLASS (container), name); if (!pspec) { g_warning ("%s does not have a child property called %s", G_OBJECT_TYPE_NAME (container), name); return; } else if (!(pspec->flags & G_PARAM_WRITABLE)) { g_warning ("Child property '%s' of container class '%s' is not writable", name, G_OBJECT_TYPE_NAME (container)); return; } if (!gtk_builder_value_from_string (builder, pspec, value, &gvalue, &error)) { g_warning ("Could not read property %s:%s with value %s of type %s: %s", g_type_name (G_OBJECT_TYPE (container)), name, value, g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)), error->message); g_error_free (error); return; } g_object_ref (container); g_object_ref (child); nqueue = g_object_notify_queue_freeze (G_OBJECT (child), _gtk_widget_child_property_notify_context); container_set_child_property (container, child, pspec, &gvalue, nqueue); g_object_notify_queue_thaw (G_OBJECT (child), nqueue); g_object_unref (container); g_object_unref (child); g_value_unset (&gvalue); } typedef struct { GtkBuilder *builder; GtkContainer *container; GtkWidget *child; GString *string; gchar *child_prop_name; gchar *context; gboolean translatable; } PackingData; static void packing_start_element (GMarkupParseContext *context, const gchar *element_name, const gchar **names, const gchar **values, gpointer user_data, GError **error) { PackingData *data = (PackingData*)user_data; if (strcmp (element_name, "property") == 0) { const gchar *name; gboolean translatable = FALSE; const gchar *ctx = NULL; if (!_gtk_builder_check_parent (data->builder, context, "packing", error)) return; if (!g_markup_collect_attributes (element_name, names, values, error, G_MARKUP_COLLECT_STRING, "name", &name, G_MARKUP_COLLECT_BOOLEAN|G_MARKUP_COLLECT_OPTIONAL, "translatable", &translatable, G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "comments", NULL, G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "context", &ctx, G_MARKUP_COLLECT_INVALID)) { _gtk_builder_prefix_error (data->builder, context, error); return; } data->child_prop_name = g_strdup (name); data->translatable = translatable; data->context = g_strdup (ctx); } else if (strcmp (element_name, "packing") == 0) { if (!_gtk_builder_check_parent (data->builder, context, "child", error)) return; if (!g_markup_collect_attributes (element_name, names, values, error, G_MARKUP_COLLECT_INVALID, NULL, NULL, G_MARKUP_COLLECT_INVALID)) _gtk_builder_prefix_error (data->builder, context, error); } else { _gtk_builder_error_unhandled_tag (data->builder, context, "GtkContainer", element_name, error); } } static void packing_text_element (GMarkupParseContext *context, const gchar *text, gsize text_len, gpointer user_data, GError **error) { PackingData *data = (PackingData*)user_data; if (data->child_prop_name) g_string_append_len (data->string, text, text_len); } static void packing_end_element (GMarkupParseContext *context, const gchar *element_name, gpointer user_data, GError **error) { PackingData *data = (PackingData*)user_data; /* translate the string */ if (data->string->len && data->translatable) { const gchar *translated; const gchar *domain; domain = gtk_builder_get_translation_domain (data->builder); translated = _gtk_builder_parser_translate (domain, data->context, data->string->str); g_string_assign (data->string, translated); } if (data->child_prop_name) gtk_container_buildable_set_child_property (data->container, data->builder, data->child, data->child_prop_name, data->string->str); g_string_set_size (data->string, 0); g_clear_pointer (&data->child_prop_name, g_free); g_clear_pointer (&data->context, g_free); data->translatable = FALSE; } static const GMarkupParser packing_parser = { packing_start_element, packing_end_element, packing_text_element, }; typedef struct { gchar *name; gint line; gint col; } FocusChainWidget; static void focus_chain_widget_free (gpointer data) { FocusChainWidget *fcw = data; g_free (fcw->name); g_free (fcw); } typedef struct { GSList *items; GObject *object; GtkBuilder *builder; gint line; gint col; } FocusChainData; static void focus_chain_start_element (GMarkupParseContext *context, const gchar *element_name, const gchar **names, const gchar **values, gpointer user_data, GError **error) { FocusChainData *data = (FocusChainData*)user_data; if (strcmp (element_name, "widget") == 0) { const gchar *name; FocusChainWidget *fcw; if (!_gtk_builder_check_parent (data->builder, context, "focus-chain", error)) return; if (!g_markup_collect_attributes (element_name, names, values, error, G_MARKUP_COLLECT_STRING, "name", &name, G_MARKUP_COLLECT_INVALID)) { _gtk_builder_prefix_error (data->builder, context, error); return; } fcw = g_new (FocusChainWidget, 1); fcw->name = g_strdup (name); g_markup_parse_context_get_position (context, &fcw->line, &fcw->col); data->items = g_slist_prepend (data->items, fcw); } else if (strcmp (element_name, "focus-chain") == 0) { if (!_gtk_builder_check_parent (data->builder, context, "object", error)) return; if (!g_markup_collect_attributes (element_name, names, values, error, G_MARKUP_COLLECT_INVALID, "", NULL, G_MARKUP_COLLECT_INVALID)) _gtk_builder_prefix_error (data->builder, context, error); } else { _gtk_builder_error_unhandled_tag (data->builder, context, "GtkContainer", element_name, error); } } static const GMarkupParser focus_chain_parser = { focus_chain_start_element }; static gboolean gtk_container_buildable_custom_tag_start (GtkBuildable *buildable, GtkBuilder *builder, GObject *child, const gchar *tagname, GMarkupParser *parser, gpointer *parser_data) { if (parent_buildable_iface->custom_tag_start (buildable, builder, child, tagname, parser, parser_data)) return TRUE; if (child && strcmp (tagname, "packing") == 0) { PackingData *data; data = g_slice_new0 (PackingData); data->string = g_string_new (""); data->builder = builder; data->container = GTK_CONTAINER (buildable); data->child = GTK_WIDGET (child); data->child_prop_name = NULL; *parser = packing_parser; *parser_data = data; return TRUE; } else if (!child && strcmp (tagname, "focus-chain") == 0) { FocusChainData *data; data = g_slice_new0 (FocusChainData); data->items = NULL; data->object = G_OBJECT (buildable); data->builder = builder; *parser = focus_chain_parser; *parser_data = data; return TRUE; } return FALSE; } static void gtk_container_buildable_custom_tag_end (GtkBuildable *buildable, GtkBuilder *builder, GObject *child, const gchar *tagname, gpointer *parser_data) { if (strcmp (tagname, "packing") == 0) { PackingData *data = (PackingData*)parser_data; g_string_free (data->string, TRUE); g_slice_free (PackingData, data); return; } if (parent_buildable_iface->custom_tag_end) parent_buildable_iface->custom_tag_end (buildable, builder, child, tagname, parser_data); } static void gtk_container_buildable_custom_finished (GtkBuildable *buildable, GtkBuilder *builder, GObject *child, const gchar *tagname, gpointer parser_data) { if (strcmp (tagname, "focus-chain") == 0) { FocusChainData *data = (FocusChainData*)parser_data; FocusChainWidget *fcw; GSList *l; GList *chain; GObject *object; chain = NULL; for (l = data->items; l; l = l->next) { fcw = l->data; object = _gtk_builder_lookup_object (builder, fcw->name, fcw->line, fcw->col); if (!object) continue; chain = g_list_prepend (chain, object); } gtk_container_set_focus_chain (GTK_CONTAINER (data->object), chain); g_list_free (chain); g_slist_free_full (data->items, focus_chain_widget_free); g_slice_free (FocusChainData, data); return; } if (parent_buildable_iface->custom_finished) parent_buildable_iface->custom_finished (buildable, builder, child, tagname, parser_data); } /** * gtk_container_child_type: * @container: a #GtkContainer * * Returns the type of the children supported by the container. * * Note that this may return %G_TYPE_NONE to indicate that no more * children can be added, e.g. for a #GtkPaned which already has two * children. * * Returns: a #GType. **/ GType gtk_container_child_type (GtkContainer *container) { GType slot; GtkContainerClass *class; g_return_val_if_fail (GTK_IS_CONTAINER (container), 0); class = GTK_CONTAINER_GET_CLASS (container); if (class->child_type) slot = class->child_type (container); else slot = G_TYPE_NONE; return slot; } /* --- GtkContainer child property mechanism --- */ /** * gtk_container_child_notify: * @container: the #GtkContainer * @child: the child widget * @child_property: the name of a child property installed on * the class of @container * * Emits a #GtkWidget::child-notify signal for the * [child property][child-properties] * @child_property on the child. * * This is an analogue of g_object_notify() for child properties. * * Also see gtk_widget_child_notify(). */ void gtk_container_child_notify (GtkContainer *container, GtkWidget *child, const gchar *child_property) { GObject *obj; GParamSpec *pspec; g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (child)); g_return_if_fail (child_property != NULL); obj = G_OBJECT (child); if (obj->ref_count == 0) return; g_object_ref (obj); pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, child_property, G_OBJECT_TYPE (container), TRUE); if (pspec == NULL) { g_warning ("%s: container class '%s' has no child property named '%s'", G_STRLOC, G_OBJECT_TYPE_NAME (container), child_property); } else { GObjectNotifyQueue *nqueue; nqueue = g_object_notify_queue_freeze (obj, _gtk_widget_child_property_notify_context); g_object_notify_queue_add (obj, nqueue, pspec); g_object_notify_queue_thaw (obj, nqueue); } g_object_unref (obj); } /** * gtk_container_child_notify_by_pspec: * @container: the #GtkContainer * @child: the child widget * @pspec: the #GParamSpec of a child property instealled on * the class of @container * * Emits a #GtkWidget::child-notify signal for the * [child property][child-properties] specified by * @pspec on the child. * * This is an analogue of g_object_notify_by_pspec() for child properties. */ void gtk_container_child_notify_by_pspec (GtkContainer *container, GtkWidget *child, GParamSpec *pspec) { GObject *obj = G_OBJECT (child); GObjectNotifyQueue *nqueue; g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (child)); g_return_if_fail (G_IS_PARAM_SPEC (pspec)); if (obj->ref_count == 0) return; g_object_ref (obj); nqueue = g_object_notify_queue_freeze (obj, _gtk_widget_child_property_notify_context); g_object_notify_queue_add (obj, nqueue, pspec); g_object_notify_queue_thaw (obj, nqueue); g_object_unref (obj); } static inline void container_get_child_property (GtkContainer *container, GtkWidget *child, GParamSpec *pspec, GValue *value) { GtkContainerClass *class = g_type_class_peek (pspec->owner_type); class->get_child_property (container, child, PARAM_SPEC_PARAM_ID (pspec), value, pspec); } /** * gtk_container_child_get_valist: * @container: a #GtkContainer * @child: a widget which is a child of @container * @first_property_name: the name of the first property to get * @var_args: return location for the first property, followed * optionally by more name/return location pairs, followed by %NULL * * Gets the values of one or more child properties for @child and @container. **/ void gtk_container_child_get_valist (GtkContainer *container, GtkWidget *child, const gchar *first_property_name, va_list var_args) { const gchar *name; g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (child)); g_object_ref (container); g_object_ref (child); name = first_property_name; while (name) { GValue value = G_VALUE_INIT; GParamSpec *pspec; gchar *error; pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, name, G_OBJECT_TYPE (container), TRUE); if (!pspec) { g_warning ("%s: container class '%s' has no child property named '%s'", G_STRLOC, G_OBJECT_TYPE_NAME (container), name); break; } if (!(pspec->flags & G_PARAM_READABLE)) { g_warning ("%s: child property '%s' of container class '%s' is not readable", G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (container)); break; } g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec)); container_get_child_property (container, child, pspec, &value); G_VALUE_LCOPY (&value, var_args, 0, &error); if (error) { g_warning ("%s: %s", G_STRLOC, error); g_free (error); g_value_unset (&value); break; } g_value_unset (&value); name = va_arg (var_args, gchar*); } g_object_unref (child); g_object_unref (container); } /** * gtk_container_child_get_property: * @container: a #GtkContainer * @child: a widget which is a child of @container * @property_name: the name of the property to get * @value: a location to return the value * * Gets the value of a child property for @child and @container. **/ void gtk_container_child_get_property (GtkContainer *container, GtkWidget *child, const gchar *property_name, GValue *value) { GParamSpec *pspec; g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (child)); g_return_if_fail (property_name != NULL); g_return_if_fail (G_IS_VALUE (value)); g_object_ref (container); g_object_ref (child); pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, property_name, G_OBJECT_TYPE (container), TRUE); if (!pspec) g_warning ("%s: container class '%s' has no child property named '%s'", G_STRLOC, G_OBJECT_TYPE_NAME (container), property_name); else if (!(pspec->flags & G_PARAM_READABLE)) g_warning ("%s: child property '%s' of container class '%s' is not readable", G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (container)); else { GValue *prop_value, tmp_value = G_VALUE_INIT; /* auto-conversion of the callers value type */ if (G_VALUE_TYPE (value) == G_PARAM_SPEC_VALUE_TYPE (pspec)) { g_value_reset (value); prop_value = value; } else if (!g_value_type_transformable (G_PARAM_SPEC_VALUE_TYPE (pspec), G_VALUE_TYPE (value))) { g_warning ("can't retrieve child property '%s' of type '%s' as value of type '%s'", pspec->name, g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)), G_VALUE_TYPE_NAME (value)); g_object_unref (child); g_object_unref (container); return; } else { g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec)); prop_value = &tmp_value; } container_get_child_property (container, child, pspec, prop_value); if (prop_value != value) { g_value_transform (prop_value, value); g_value_unset (&tmp_value); } } g_object_unref (child); g_object_unref (container); } /** * gtk_container_child_set_valist: * @container: a #GtkContainer * @child: a widget which is a child of @container * @first_property_name: the name of the first property to set * @var_args: a %NULL-terminated list of property names and values, starting * with @first_prop_name * * Sets one or more child properties for @child and @container. **/ void gtk_container_child_set_valist (GtkContainer *container, GtkWidget *child, const gchar *first_property_name, va_list var_args) { GObjectNotifyQueue *nqueue; const gchar *name; g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (child)); g_object_ref (container); g_object_ref (child); nqueue = g_object_notify_queue_freeze (G_OBJECT (child), _gtk_widget_child_property_notify_context); name = first_property_name; while (name) { GValue value = G_VALUE_INIT; gchar *error = NULL; GParamSpec *pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, name, G_OBJECT_TYPE (container), TRUE); if (!pspec) { g_warning ("%s: container class '%s' has no child property named '%s'", G_STRLOC, G_OBJECT_TYPE_NAME (container), name); break; } if (!(pspec->flags & G_PARAM_WRITABLE)) { g_warning ("%s: child property '%s' of container class '%s' is not writable", G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (container)); break; } G_VALUE_COLLECT_INIT (&value, G_PARAM_SPEC_VALUE_TYPE (pspec), var_args, 0, &error); if (error) { g_warning ("%s: %s", G_STRLOC, error); g_free (error); /* we purposely leak the value here, it might not be * in a sane state if an error condition occoured */ break; } container_set_child_property (container, child, pspec, &value, nqueue); g_value_unset (&value); name = va_arg (var_args, gchar*); } g_object_notify_queue_thaw (G_OBJECT (child), nqueue); g_object_unref (container); g_object_unref (child); } /** * gtk_container_child_set_property: * @container: a #GtkContainer * @child: a widget which is a child of @container * @property_name: the name of the property to set * @value: the value to set the property to * * Sets a child property for @child and @container. **/ void gtk_container_child_set_property (GtkContainer *container, GtkWidget *child, const gchar *property_name, const GValue *value) { GObjectNotifyQueue *nqueue; GParamSpec *pspec; g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (child)); g_return_if_fail (property_name != NULL); g_return_if_fail (G_IS_VALUE (value)); g_object_ref (container); g_object_ref (child); nqueue = g_object_notify_queue_freeze (G_OBJECT (child), _gtk_widget_child_property_notify_context); pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, property_name, G_OBJECT_TYPE (container), TRUE); if (!pspec) g_warning ("%s: container class '%s' has no child property named '%s'", G_STRLOC, G_OBJECT_TYPE_NAME (container), property_name); else if (!(pspec->flags & G_PARAM_WRITABLE)) g_warning ("%s: child property '%s' of container class '%s' is not writable", G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (container)); else { container_set_child_property (container, child, pspec, value, nqueue); } g_object_notify_queue_thaw (G_OBJECT (child), nqueue); g_object_unref (container); g_object_unref (child); } /** * gtk_container_add_with_properties: * @container: a #GtkContainer * @widget: a widget to be placed inside @container * @first_prop_name: the name of the first child property to set * @...: a %NULL-terminated list of property names and values, starting * with @first_prop_name * * Adds @widget to @container, setting child properties at the same time. * See gtk_container_add() and gtk_container_child_set() for more details. */ void gtk_container_add_with_properties (GtkContainer *container, GtkWidget *widget, const gchar *first_prop_name, ...) { g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (widget)); g_return_if_fail (_gtk_widget_get_parent (widget) == NULL); g_object_ref (container); g_object_ref (widget); gtk_widget_freeze_child_notify (widget); g_signal_emit (container, container_signals[ADD], 0, widget); if (_gtk_widget_get_parent (widget)) { va_list var_args; va_start (var_args, first_prop_name); gtk_container_child_set_valist (container, widget, first_prop_name, var_args); va_end (var_args); } gtk_widget_thaw_child_notify (widget); g_object_unref (widget); g_object_unref (container); } /** * gtk_container_child_set: * @container: a #GtkContainer * @child: a widget which is a child of @container * @first_prop_name: the name of the first property to set * @...: a %NULL-terminated list of property names and values, starting * with @first_prop_name * * Sets one or more child properties for @child and @container. */ void gtk_container_child_set (GtkContainer *container, GtkWidget *child, const gchar *first_prop_name, ...) { va_list var_args; va_start (var_args, first_prop_name); gtk_container_child_set_valist (container, child, first_prop_name, var_args); va_end (var_args); } /** * gtk_container_child_get: * @container: a #GtkContainer * @child: a widget which is a child of @container * @first_prop_name: the name of the first property to get * @...: return location for the first property, followed * optionally by more name/return location pairs, followed by %NULL * * Gets the values of one or more child properties for @child and @container. */ void gtk_container_child_get (GtkContainer *container, GtkWidget *child, const gchar *first_prop_name, ...) { va_list var_args; va_start (var_args, first_prop_name); gtk_container_child_get_valist (container, child, first_prop_name, var_args); va_end (var_args); } static inline void install_child_property_internal (GType g_type, guint property_id, GParamSpec *pspec) { if (g_param_spec_pool_lookup (_gtk_widget_child_property_pool, pspec->name, g_type, FALSE)) { g_warning ("Class '%s' already contains a child property named '%s'", g_type_name (g_type), pspec->name); return; } g_param_spec_ref (pspec); g_param_spec_sink (pspec); PARAM_SPEC_SET_PARAM_ID (pspec, property_id); g_param_spec_pool_insert (_gtk_widget_child_property_pool, pspec, g_type); } /** * gtk_container_class_install_child_property: * @cclass: a #GtkContainerClass * @property_id: the id for the property * @pspec: the #GParamSpec for the property * * Installs a child property on a container class. **/ void gtk_container_class_install_child_property (GtkContainerClass *cclass, guint property_id, GParamSpec *pspec) { g_return_if_fail (GTK_IS_CONTAINER_CLASS (cclass)); g_return_if_fail (G_IS_PARAM_SPEC (pspec)); if (pspec->flags & G_PARAM_WRITABLE) g_return_if_fail (cclass->set_child_property != NULL); if (pspec->flags & G_PARAM_READABLE) g_return_if_fail (cclass->get_child_property != NULL); g_return_if_fail (property_id > 0); g_return_if_fail (PARAM_SPEC_PARAM_ID (pspec) == 0); /* paranoid */ if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) g_return_if_fail ((pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) == 0); install_child_property_internal (G_OBJECT_CLASS_TYPE (cclass), property_id, pspec); } /** * gtk_container_class_install_child_properties: * @cclass: a #GtkContainerClass * @n_pspecs: the length of the #GParamSpec array * @pspecs: (array length=n_pspecs): the #GParamSpec array defining the new * child properties * * Installs child properties on a container class. */ void gtk_container_class_install_child_properties (GtkContainerClass *cclass, guint n_pspecs, GParamSpec **pspecs) { gint i; g_return_if_fail (GTK_IS_CONTAINER_CLASS (cclass)); g_return_if_fail (n_pspecs > 1); g_return_if_fail (pspecs[0] == NULL); /* we skip the first element of the array as it would have a 0 prop_id */ for (i = 1; i < n_pspecs; i++) { GParamSpec *pspec = pspecs[i]; g_return_if_fail (G_IS_PARAM_SPEC (pspec)); if (pspec->flags & G_PARAM_WRITABLE) g_return_if_fail (cclass->set_child_property != NULL); if (pspec->flags & G_PARAM_READABLE) g_return_if_fail (cclass->get_child_property != NULL); g_return_if_fail (PARAM_SPEC_PARAM_ID (pspec) == 0); /* paranoid */ if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) g_return_if_fail ((pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) == 0); install_child_property_internal (G_OBJECT_CLASS_TYPE (cclass), i, pspec); } } /** * gtk_container_class_find_child_property: * @cclass: (type GtkContainerClass): a #GtkContainerClass * @property_name: the name of the child property to find * * Finds a child property of a container class by name. * * Returns: (nullable) (transfer none): the #GParamSpec of the child * property or %NULL if @class has no child property with that * name. */ GParamSpec* gtk_container_class_find_child_property (GObjectClass *cclass, const gchar *property_name) { g_return_val_if_fail (GTK_IS_CONTAINER_CLASS (cclass), NULL); g_return_val_if_fail (property_name != NULL, NULL); return g_param_spec_pool_lookup (_gtk_widget_child_property_pool, property_name, G_OBJECT_CLASS_TYPE (cclass), TRUE); } /** * gtk_container_class_list_child_properties: * @cclass: (type GtkContainerClass): a #GtkContainerClass * @n_properties: location to return the number of child properties found * * Returns all child properties of a container class. * * Returns: (array length=n_properties) (transfer container): * a newly allocated %NULL-terminated array of #GParamSpec*. * The array must be freed with g_free(). */ GParamSpec** gtk_container_class_list_child_properties (GObjectClass *cclass, guint *n_properties) { GParamSpec **pspecs; guint n; g_return_val_if_fail (GTK_IS_CONTAINER_CLASS (cclass), NULL); pspecs = g_param_spec_pool_list (_gtk_widget_child_property_pool, G_OBJECT_CLASS_TYPE (cclass), &n); if (n_properties) *n_properties = n; return pspecs; } static void gtk_container_add_unimplemented (GtkContainer *container, GtkWidget *widget) { g_warning ("GtkContainerClass::add not implemented for '%s'", g_type_name (G_TYPE_FROM_INSTANCE (container))); } static void gtk_container_remove_unimplemented (GtkContainer *container, GtkWidget *widget) { g_warning ("GtkContainerClass::remove not implemented for '%s'", g_type_name (G_TYPE_FROM_INSTANCE (container))); } static void gtk_container_init (GtkContainer *container) { } static void gtk_container_destroy (GtkWidget *widget) { GtkContainer *container = GTK_CONTAINER (widget); GtkContainerPrivate *priv = gtk_container_get_instance_private (container); if (priv->restyle_pending) priv->restyle_pending = FALSE; /* do this before walking child widgets, to avoid * removing children from focus chain one by one. */ if (priv->has_focus_chain) gtk_container_unset_focus_chain (container); gtk_container_foreach (container, (GtkCallback) gtk_widget_destroy, NULL); GTK_WIDGET_CLASS (parent_class)->destroy (widget); } /** * gtk_container_add: * @container: a #GtkContainer * @widget: a widget to be placed inside @container * * Adds @widget to @container. Typically used for simple containers * such as #GtkWindow, #GtkFrame, or #GtkButton; for more complicated * layout containers such as #GtkBox or #GtkGrid, this function will * pick default packing parameters that may not be correct. So * consider functions such as gtk_box_pack_start() and * gtk_grid_attach() as an alternative to gtk_container_add() in * those cases. A widget may be added to only one container at a time; * you can’t place the same widget inside two different containers. * * Note that some containers, such as #GtkScrolledWindow or #GtkListBox, * may add intermediate children between the added widget and the * container. */ void gtk_container_add (GtkContainer *container, GtkWidget *widget) { GtkWidget *parent; g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (widget)); parent = _gtk_widget_get_parent (widget); if (parent != NULL) { g_warning ("Attempting to add a widget with type %s to a container of " "type %s, but the widget is already inside a container of type %s, " "please remove the widget from its existing container first." , g_type_name (G_OBJECT_TYPE (widget)), g_type_name (G_OBJECT_TYPE (container)), g_type_name (G_OBJECT_TYPE (parent))); return; } g_signal_emit (container, container_signals[ADD], 0, widget); _gtk_container_accessible_add (GTK_WIDGET (container), widget); } /** * gtk_container_remove: * @container: a #GtkContainer * @widget: a current child of @container * * Removes @widget from @container. @widget must be inside @container. * Note that @container will own a reference to @widget, and that this * may be the last reference held; so removing a widget from its * container can destroy that widget. If you want to use @widget * again, you need to add a reference to it before removing it from * a container, using g_object_ref(). If you don’t want to use @widget * again it’s usually more efficient to simply destroy it directly * using gtk_widget_destroy() since this will remove it from the * container and help break any circular reference count cycles. **/ void gtk_container_remove (GtkContainer *container, GtkWidget *widget) { g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (GTK_IS_WIDGET (widget)); g_object_ref (container); g_object_ref (widget); g_signal_emit (container, container_signals[REMOVE], 0, widget); _gtk_container_accessible_remove (GTK_WIDGET (container), widget); g_object_unref (widget); g_object_unref (container); } static gboolean gtk_container_needs_idle_sizer (GtkContainer *container) { GtkContainerPrivate *priv = gtk_container_get_instance_private (container); if (priv->restyle_pending) return TRUE; return gtk_widget_needs_allocate (GTK_WIDGET (container)); } static void gtk_container_idle_sizer (GdkFrameClock *clock, GtkContainer *container) { GtkContainerPrivate *priv = gtk_container_get_instance_private (container); /* We validate the style contexts in a single loop before even trying * to handle resizes instead of doing validations inline. * This is mostly necessary for compatibility reasons with old code, * because both style_updated and size_allocate functions often change * styles and so could cause infinite loops in this function. * * It's important to note that even an invalid style context returns * sane values. So the result of an invalid style context will never be * a program crash, but only a wrong layout or rendering. */ if (priv->restyle_pending) { priv->restyle_pending = FALSE; gtk_css_node_validate (gtk_widget_get_css_node (GTK_WIDGET (container))); } /* we may be invoked with a container_resize_queue of NULL, because * queue_resize could have been adding an extra idle function while * the queue still got processed. we better just ignore such case * than trying to explicitly work around them with some extra flags, * since it doesn't cause any actual harm. */ if (gtk_widget_needs_allocate (GTK_WIDGET (container))) { gtk_container_check_resize (container); } if (!gtk_container_needs_idle_sizer (container)) { _gtk_container_stop_idle_sizer (container); } else { gdk_frame_clock_request_phase (clock, GDK_FRAME_CLOCK_PHASE_LAYOUT); } } static void gtk_container_start_idle_sizer (GtkContainer *container) { GtkContainerPrivate *priv = gtk_container_get_instance_private (container); GdkFrameClock *clock; if (priv->resize_handler != 0) return; clock = gtk_widget_get_frame_clock (GTK_WIDGET (container)); if (clock == NULL) return; priv->resize_clock = clock; priv->resize_handler = g_signal_connect (clock, "layout", G_CALLBACK (gtk_container_idle_sizer), container); gdk_frame_clock_request_phase (clock, GDK_FRAME_CLOCK_PHASE_LAYOUT); } void _gtk_container_stop_idle_sizer (GtkContainer *container) { GtkContainerPrivate *priv = gtk_container_get_instance_private (container); if (priv->resize_handler == 0) return; g_signal_handler_disconnect (priv->resize_clock, priv->resize_handler); priv->resize_handler = 0; priv->resize_clock = NULL; } void gtk_container_queue_resize_handler (GtkContainer *container) { GtkWidget *widget; widget = GTK_WIDGET (container); if (_gtk_widget_get_visible (widget) && gtk_widget_needs_allocate (widget) && _gtk_widget_is_toplevel (widget)) { gtk_container_start_idle_sizer (container); } } void _gtk_container_queue_restyle (GtkContainer *container) { GtkContainerPrivate *priv = gtk_container_get_instance_private (container); g_return_if_fail (GTK_CONTAINER (container)); if (priv->restyle_pending) return; gtk_container_start_idle_sizer (container); priv->restyle_pending = TRUE; } void _gtk_container_maybe_start_idle_sizer (GtkContainer *container) { if (gtk_container_needs_idle_sizer (container)) gtk_container_start_idle_sizer (container); } void gtk_container_check_resize (GtkContainer *container) { g_return_if_fail (GTK_IS_CONTAINER (container)); g_signal_emit (container, container_signals[CHECK_RESIZE], 0); } static void gtk_container_real_check_resize (GtkContainer *container) { GtkWidget *widget = GTK_WIDGET (container); GtkAllocation allocation; GtkRequisition requisition; int baseline; if (_gtk_widget_get_alloc_needed (widget)) { if (!_gtk_widget_is_toplevel (widget)) { GtkAllocation clip; gtk_widget_get_preferred_size (widget, &requisition, NULL); gtk_widget_get_allocated_size (widget, &allocation, &baseline); if (allocation.width < requisition.width) allocation.width = requisition.width; if (allocation.height < requisition.height) allocation.height = requisition.height; gtk_widget_size_allocate (widget, &allocation, baseline, &clip); } else gtk_widget_queue_resize (widget); } else { gtk_widget_ensure_allocate (widget); } } typedef struct { gint hfw; gint wfh; } RequestModeCount; static void count_request_modes (GtkWidget *widget, RequestModeCount *count) { GtkSizeRequestMode mode = gtk_widget_get_request_mode (widget); switch (mode) { case GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH: count->hfw++; break; case GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT: count->wfh++; break; case GTK_SIZE_REQUEST_CONSTANT_SIZE: default: break; } } static GtkSizeRequestMode gtk_container_get_request_mode (GtkWidget *widget) { GtkContainer *container = GTK_CONTAINER (widget); RequestModeCount count = { 0, 0 }; gtk_container_forall (container, (GtkCallback)count_request_modes, &count); if (!count.hfw && !count.wfh) return GTK_SIZE_REQUEST_CONSTANT_SIZE; else return count.wfh > count.hfw ? GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT : GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH; } /** * gtk_container_forall: (virtual forall) * @container: a #GtkContainer * @callback: (scope call) (closure callback_data): a callback * @callback_data: callback user data * * Invokes @callback on each direct child of @container, including * children that are considered “internal” (implementation details * of the container). “Internal” children generally weren’t added * by the user of the container, but were added by the container * implementation itself. * * Most applications should use gtk_container_foreach(), rather * than gtk_container_forall(). **/ void gtk_container_forall (GtkContainer *container, GtkCallback callback, gpointer callback_data) { g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (callback != NULL); gtk_widget_forall (GTK_WIDGET (container), callback, callback_data); } /** * gtk_container_foreach: * @container: a #GtkContainer * @callback: (scope call): a callback * @callback_data: callback user data * * Invokes @callback on each non-internal child of @container. * See gtk_container_forall() for details on what constitutes * an “internal” child. For all practical purposes, this function * should iterate over precisely those child widgets that were * added to the container by the application with explicit add() * calls. * * Most applications should use gtk_container_foreach(), * rather than gtk_container_forall(). **/ void gtk_container_foreach (GtkContainer *container, GtkCallback callback, gpointer callback_data) { GtkContainerClass *class; g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (callback != NULL); class = GTK_CONTAINER_GET_CLASS (container); if (class->forall) class->forall (container, callback, callback_data); } /** * gtk_container_set_focus_child: * @container: a #GtkContainer * @child: (allow-none): a #GtkWidget, or %NULL * * Sets, or unsets if @child is %NULL, the focused child of @container. * * This function emits the GtkContainer::set_focus_child signal of * @container. Implementations of #GtkContainer can override the * default behaviour by overriding the class closure of this signal. * * This is function is mostly meant to be used by widgets. Applications can use * gtk_widget_grab_focus() to manually set the focus to a specific widget. */ void gtk_container_set_focus_child (GtkContainer *container, GtkWidget *child) { g_return_if_fail (GTK_IS_CONTAINER (container)); if (child) g_return_if_fail (GTK_IS_WIDGET (child)); g_signal_emit (container, container_signals[SET_FOCUS_CHILD], 0, child); } /** * gtk_container_get_children: * @container: a #GtkContainer * * Returns the container’s non-internal children. See * gtk_container_forall() for details on what constitutes an "internal" child. * * Returns: (element-type GtkWidget) (transfer container): a newly-allocated list of the container’s non-internal children. **/ GList* gtk_container_get_children (GtkContainer *container) { GList *children = NULL; gtk_container_foreach (container, gtk_container_children_callback, &children); return g_list_reverse (children); } typedef struct { gboolean hexpand; gboolean vexpand; } ComputeExpandData; static void gtk_container_compute_expand_callback (GtkWidget *widget, gpointer client_data) { ComputeExpandData *data = client_data; /* note that we don't get_expand on the child if we already know we * have to expand, so we only recurse into children until we find * one that expands and then we basically don't do any more * work. This means that we can leave some children in a * need_compute_expand state, which is fine, as long as GtkWidget * doesn't rely on an invariant that "if a child has * need_compute_expand, its parents also do" * * gtk_widget_compute_expand() always returns FALSE if the * child is !visible so that's taken care of. */ data->hexpand = data->hexpand || gtk_widget_compute_expand (widget, GTK_ORIENTATION_HORIZONTAL); data->vexpand = data->vexpand || gtk_widget_compute_expand (widget, GTK_ORIENTATION_VERTICAL); } static void gtk_container_compute_expand (GtkWidget *widget, gboolean *hexpand_p, gboolean *vexpand_p) { ComputeExpandData data; data.hexpand = FALSE; data.vexpand = FALSE; gtk_container_forall (GTK_CONTAINER (widget), gtk_container_compute_expand_callback, &data); *hexpand_p = data.hexpand; *vexpand_p = data.vexpand; } static void gtk_container_real_set_focus_child (GtkContainer *container, GtkWidget *focus_child) { g_return_if_fail (GTK_IS_CONTAINER (container)); g_return_if_fail (focus_child == NULL || GTK_IS_WIDGET (focus_child)); /* Check for h/v adjustments and scroll to show the focus child if possible */ if (focus_child) { GtkAdjustment *hadj; GtkAdjustment *vadj; GtkAllocation allocation; gint x, y; hadj = g_object_get_qdata (G_OBJECT (container), hadjustment_key_id); vadj = g_object_get_qdata (G_OBJECT (container), vadjustment_key_id); if (hadj || vadj) { GtkWidget *child = focus_child; while (gtk_widget_get_focus_child (child)) child = gtk_widget_get_focus_child (child); if (!gtk_widget_translate_coordinates (child, focus_child, 0, 0, &x, &y)) return; gtk_widget_get_outer_allocation (child, &allocation); if (vadj) gtk_adjustment_clamp_page (vadj, y, y + allocation.height); if (hadj) gtk_adjustment_clamp_page (hadj, x, x + allocation.width); } } } static GList* get_focus_chain (GtkContainer *container) { return g_object_get_qdata (G_OBJECT (container), quark_focus_chain); } /* same as gtk_container_get_children, except it includes internals */ static GList * gtk_container_get_all_children (GtkContainer *container) { GList *children = NULL; gtk_container_forall (container, gtk_container_children_callback, &children); return children; } static GtkWidgetPath * gtk_container_real_get_path_for_child (GtkContainer *container, GtkWidget *child) { GtkWidgetPath *path; GtkWidget *widget = GTK_WIDGET (container); path = _gtk_widget_create_path (widget); gtk_widget_path_append_for_widget (path, child); return path; } static gboolean gtk_container_focus (GtkWidget *widget, GtkDirectionType direction) { GtkContainerPrivate *priv; GList *children; GList *sorted_children; gint return_val; GtkContainer *container; g_return_val_if_fail (GTK_IS_CONTAINER (widget), FALSE); container = GTK_CONTAINER (widget); priv = gtk_container_get_instance_private (container); return_val = FALSE; if (gtk_widget_get_can_focus (widget)) { if (!gtk_widget_has_focus (widget)) { gtk_widget_grab_focus (widget); return_val = TRUE; } } else { /* Get a list of the containers children, allowing focus * chain to override. */ if (priv->has_focus_chain) children = g_list_copy (get_focus_chain (container)); else children = gtk_container_get_all_children (container); if (priv->has_focus_chain && (direction == GTK_DIR_TAB_FORWARD || direction == GTK_DIR_TAB_BACKWARD)) { sorted_children = g_list_copy (children); if (direction == GTK_DIR_TAB_BACKWARD) sorted_children = g_list_reverse (sorted_children); } else sorted_children = _gtk_container_focus_sort (container, children, direction, NULL); return_val = gtk_container_focus_move (container, sorted_children, direction); g_list_free (sorted_children); g_list_free (children); } return return_val; } static gint tab_compare (gconstpointer a, gconstpointer b, gpointer data) { GtkAllocation child1_allocation, child2_allocation; const GtkWidget *child1 = a; const GtkWidget *child2 = b; GtkTextDirection text_direction = GPOINTER_TO_INT (data); gint y1, y2; _gtk_widget_get_allocation ((GtkWidget *) child1, &child1_allocation); _gtk_widget_get_allocation ((GtkWidget *) child2, &child2_allocation); y1 = child1_allocation.y + child1_allocation.height / 2; y2 = child2_allocation.y + child2_allocation.height / 2; if (y1 == y2) { gint x1 = child1_allocation.x + child1_allocation.width / 2; gint x2 = child2_allocation.x + child2_allocation.width / 2; if (text_direction == GTK_TEXT_DIR_RTL) return (x1 < x2) ? 1 : ((x1 == x2) ? 0 : -1); else return (x1 < x2) ? -1 : ((x1 == x2) ? 0 : 1); } else return (y1 < y2) ? -1 : 1; } static GList * gtk_container_focus_sort_tab (GtkContainer *container, GList *children, GtkDirectionType direction, GtkWidget *old_focus) { GtkTextDirection text_direction = _gtk_widget_get_direction (GTK_WIDGET (container)); children = g_list_sort_with_data (children, tab_compare, GINT_TO_POINTER (text_direction)); /* if we are going backwards then reverse the order * of the children. */ if (direction == GTK_DIR_TAB_BACKWARD) children = g_list_reverse (children); return children; } /* Get coordinates of @widget's allocation with respect to * allocation of @container. */ static gboolean get_allocation_coords (GtkContainer *container, GtkWidget *widget, GdkRectangle *allocation) { gtk_widget_get_allocation (widget, allocation); return gtk_widget_translate_coordinates (widget, GTK_WIDGET (container), 0, 0, &allocation->x, &allocation->y); } /* Look for a child in @children that is intermediate between * the focus widget and container. This widget, if it exists, * acts as the starting widget for focus navigation. */ static GtkWidget * find_old_focus (GtkContainer *container, GList *children) { GList *tmp_list = children; while (tmp_list) { GtkWidget *child = tmp_list->data; GtkWidget *widget = child; while (widget && widget != (GtkWidget *)container) { GtkWidget *parent; parent = _gtk_widget_get_parent (widget); if (parent && (gtk_widget_get_focus_child (parent) != widget)) goto next; widget = parent; } return child; next: tmp_list = tmp_list->next; } return NULL; } static gboolean old_focus_coords (GtkContainer *container, GdkRectangle *old_focus_rect) { GtkWidget *widget = GTK_WIDGET (container); GtkWidget *toplevel = _gtk_widget_get_toplevel (widget); GtkWidget *old_focus; if (GTK_IS_WINDOW (toplevel)) { old_focus = gtk_window_get_focus (GTK_WINDOW (toplevel)); if (old_focus) return get_allocation_coords (container, old_focus, old_focus_rect); } return FALSE; } typedef struct _CompareInfo CompareInfo; struct _CompareInfo { GtkContainer *container; gint x; gint y; gboolean reverse; }; static gint up_down_compare (gconstpointer a, gconstpointer b, gpointer data) { GdkRectangle allocation1; GdkRectangle allocation2; CompareInfo *compare = data; gint y1, y2; get_allocation_coords (compare->container, (GtkWidget *)a, &allocation1); get_allocation_coords (compare->container, (GtkWidget *)b, &allocation2); y1 = allocation1.y + allocation1.height / 2; y2 = allocation2.y + allocation2.height / 2; if (y1 == y2) { gint x1 = abs (allocation1.x + allocation1.width / 2 - compare->x); gint x2 = abs (allocation2.x + allocation2.width / 2 - compare->x); if (compare->reverse) return (x1 < x2) ? 1 : ((x1 == x2) ? 0 : -1); else return (x1 < x2) ? -1 : ((x1 == x2) ? 0 : 1); } else return (y1 < y2) ? -1 : 1; } static GList * gtk_container_focus_sort_up_down (GtkContainer *container, GList *children, GtkDirectionType direction, GtkWidget *old_focus) { CompareInfo compare; GList *tmp_list; GdkRectangle old_allocation; compare.container = container; compare.reverse = (direction == GTK_DIR_UP); if (!old_focus) old_focus = find_old_focus (container, children); if (old_focus && get_allocation_coords (container, old_focus, &old_allocation)) { gint compare_x1; gint compare_x2; gint compare_y; /* Delete widgets from list that don't match minimum criteria */ compare_x1 = old_allocation.x; compare_x2 = old_allocation.x + old_allocation.width; if (direction == GTK_DIR_UP) compare_y = old_allocation.y; else compare_y = old_allocation.y + old_allocation.height; tmp_list = children; while (tmp_list) { GtkWidget *child = tmp_list->data; GList *next = tmp_list->next; gint child_x1, child_x2; GdkRectangle child_allocation; if (child != old_focus) { if (get_allocation_coords (container, child, &child_allocation)) { child_x1 = child_allocation.x; child_x2 = child_allocation.x + child_allocation.width; if ((child_x2 <= compare_x1 || child_x1 >= compare_x2) /* No horizontal overlap */ || (direction == GTK_DIR_DOWN && child_allocation.y + child_allocation.height < compare_y) || /* Not below */ (direction == GTK_DIR_UP && child_allocation.y > compare_y)) /* Not above */ { children = g_list_delete_link (children, tmp_list); } } else children = g_list_delete_link (children, tmp_list); } tmp_list = next; } compare.x = (compare_x1 + compare_x2) / 2; compare.y = old_allocation.y + old_allocation.height / 2; } else { /* No old focus widget, need to figure out starting x,y some other way */ GtkAllocation allocation; GtkWidget *widget = GTK_WIDGET (container); GdkRectangle old_focus_rect; _gtk_widget_get_allocation (widget, &allocation); if (old_focus_coords (container, &old_focus_rect)) { compare.x = old_focus_rect.x + old_focus_rect.width / 2; } else { if (!_gtk_widget_get_has_window (widget)) compare.x = allocation.x + allocation.width / 2; else compare.x = allocation.width / 2; } if (!_gtk_widget_get_has_window (widget)) compare.y = (direction == GTK_DIR_DOWN) ? allocation.y : allocation.y + allocation.height; else compare.y = (direction == GTK_DIR_DOWN) ? 0 : + allocation.height; } children = g_list_sort_with_data (children, up_down_compare, &compare); if (compare.reverse) children = g_list_reverse (children); return children; } static gint left_right_compare (gconstpointer a, gconstpointer b, gpointer data) { GdkRectangle allocation1; GdkRectangle allocation2; CompareInfo *compare = data; gint x1, x2; get_allocation_coords (compare->container, (GtkWidget *)a, &allocation1); get_allocation_coords (compare->container, (GtkWidget *)b, &allocation2); x1 = allocation1.x + allocation1.width / 2; x2 = allocation2.x + allocation2.width / 2; if (x1 == x2) { gint y1 = abs (allocation1.y + allocation1.height / 2 - compare->y); gint y2 = abs (allocation2.y + allocation2.height / 2 - compare->y); if (compare->reverse) return (y1 < y2) ? 1 : ((y1 == y2) ? 0 : -1); else return (y1 < y2) ? -1 : ((y1 == y2) ? 0 : 1); } else return (x1 < x2) ? -1 : 1; } static GList * gtk_container_focus_sort_left_right (GtkContainer *container, GList *children, GtkDirectionType direction, GtkWidget *old_focus) { CompareInfo compare; GList *tmp_list; GdkRectangle old_allocation; compare.container = container; compare.reverse = (direction == GTK_DIR_LEFT); if (!old_focus) old_focus = find_old_focus (container, children); if (old_focus && get_allocation_coords (container, old_focus, &old_allocation)) { gint compare_y1; gint compare_y2; gint compare_x; /* Delete widgets from list that don't match minimum criteria */ compare_y1 = old_allocation.y; compare_y2 = old_allocation.y + old_allocation.height; if (direction == GTK_DIR_LEFT) compare_x = old_allocation.x; else compare_x = old_allocation.x + old_allocation.width; tmp_list = children; while (tmp_list) { GtkWidget *child = tmp_list->data; GList *next = tmp_list->next; gint child_y1, child_y2; GdkRectangle child_allocation; if (child != old_focus) { if (get_allocation_coords (container, child, &child_allocation)) { child_y1 = child_allocation.y; child_y2 = child_allocation.y + child_allocation.height; if ((child_y2 <= compare_y1 || child_y1 >= compare_y2) /* No vertical overlap */ || (direction == GTK_DIR_RIGHT && child_allocation.x + child_allocation.width < compare_x) || /* Not to left */ (direction == GTK_DIR_LEFT && child_allocation.x > compare_x)) /* Not to right */ { children = g_list_delete_link (children, tmp_list); } } else children = g_list_delete_link (children, tmp_list); } tmp_list = next; } compare.y = (compare_y1 + compare_y2) / 2; compare.x = old_allocation.x + old_allocation.width / 2; } else { /* No old focus widget, need to figure out starting x,y some other way */ GtkAllocation allocation; GtkWidget *widget = GTK_WIDGET (container); GdkRectangle old_focus_rect; _gtk_widget_get_allocation (widget, &allocation); if (old_focus_coords (container, &old_focus_rect)) { compare.y = old_focus_rect.y + old_focus_rect.height / 2; } else { if (!_gtk_widget_get_has_window (widget)) compare.y = allocation.y + allocation.height / 2; else compare.y = allocation.height / 2; } if (!_gtk_widget_get_has_window (widget)) compare.x = (direction == GTK_DIR_RIGHT) ? allocation.x : allocation.x + allocation.width; else compare.x = (direction == GTK_DIR_RIGHT) ? 0 : allocation.width; } children = g_list_sort_with_data (children, left_right_compare, &compare); if (compare.reverse) children = g_list_reverse (children); return children; } /** * gtk_container_focus_sort: * @container: a #GtkContainer * @children: a list of descendents of @container (they don't * have to be direct children) * @direction: focus direction * @old_focus: (allow-none): widget to use for the starting position, or %NULL * to determine this automatically. * (Note, this argument isn’t used for GTK_DIR_TAB_*, * which is the only @direction we use currently, * so perhaps this argument should be removed) * * Sorts @children in the correct order for focusing with * direction type @direction. * * Returns: a copy of @children, sorted in correct focusing order, * with children that aren’t suitable for focusing in this direction * removed. **/ GList * _gtk_container_focus_sort (GtkContainer *container, GList *children, GtkDirectionType direction, GtkWidget *old_focus) { GList *visible_children = NULL; while (children) { if (_gtk_widget_get_realized (children->data)) visible_children = g_list_prepend (visible_children, children->data); children = children->next; } switch (direction) { case GTK_DIR_TAB_FORWARD: case GTK_DIR_TAB_BACKWARD: return gtk_container_focus_sort_tab (container, visible_children, direction, old_focus); case GTK_DIR_UP: case GTK_DIR_DOWN: return gtk_container_focus_sort_up_down (container, visible_children, direction, old_focus); case GTK_DIR_LEFT: case GTK_DIR_RIGHT: return gtk_container_focus_sort_left_right (container, visible_children, direction, old_focus); default: g_assert_not_reached (); return NULL; } } static gboolean gtk_container_focus_move (GtkContainer *container, GList *children, GtkDirectionType direction) { GtkWidget *focus_child; GtkWidget *child; focus_child = gtk_widget_get_focus_child (GTK_WIDGET (container)); while (children) { child = children->data; children = children->next; if (!child) continue; if (focus_child) { if (focus_child == child) { focus_child = NULL; if (gtk_widget_child_focus (child, direction)) return TRUE; } } else if (_gtk_widget_is_drawable (child) && gtk_widget_is_ancestor (child, GTK_WIDGET (container))) { if (gtk_widget_child_focus (child, direction)) return TRUE; } } return FALSE; } static void gtk_container_children_callback (GtkWidget *widget, gpointer client_data) { GList **children; children = (GList**) client_data; *children = g_list_prepend (*children, widget); } static void chain_widget_destroyed (GtkWidget *widget, gpointer user_data) { GtkContainer *container; GList *chain; container = GTK_CONTAINER (user_data); chain = g_object_get_qdata (G_OBJECT (container), quark_focus_chain); chain = g_list_remove (chain, widget); g_signal_handlers_disconnect_by_func (widget, chain_widget_destroyed, user_data); g_object_set_qdata (G_OBJECT (container), quark_focus_chain, chain); } /** * gtk_container_set_focus_chain: * @container: a #GtkContainer * @focusable_widgets: (transfer none) (element-type GtkWidget): * the new focus chain * * Sets a focus chain, overriding the one computed automatically by GTK+. * * In principle each widget in the chain should be a descendant of the * container, but this is not enforced by this method, since it’s allowed * to set the focus chain before you pack the widgets, or have a widget * in the chain that isn’t always packed. The necessary checks are done * when the focus chain is actually traversed. **/ void gtk_container_set_focus_chain (GtkContainer *container, GList *focusable_widgets) { GtkContainerPrivate *priv = gtk_container_get_instance_private (container); GList *chain; GList *tmp_list; g_return_if_fail (GTK_IS_CONTAINER (container)); if (priv->has_focus_chain) gtk_container_unset_focus_chain (container); priv->has_focus_chain = TRUE; chain = NULL; tmp_list = focusable_widgets; while (tmp_list != NULL) { g_return_if_fail (GTK_IS_WIDGET (tmp_list->data)); /* In principle each widget in the chain should be a descendant * of the container, but we don't want to check that here. It's * expensive and also it's allowed to set the focus chain before * you pack the widgets, or have a widget in the chain that isn't * always packed. So we check for ancestor during actual traversal. */ chain = g_list_prepend (chain, tmp_list->data); g_signal_connect (tmp_list->data, "destroy", G_CALLBACK (chain_widget_destroyed), container); tmp_list = tmp_list->next; } chain = g_list_reverse (chain); g_object_set_qdata (G_OBJECT (container), quark_focus_chain, chain); } /** * gtk_container_get_focus_chain: * @container: a #GtkContainer * @focusable_widgets: (element-type GtkWidget) (out) (transfer container): location * to store the focus chain of the * container, or %NULL. You should free this list * using g_list_free() when you are done with it, however * no additional reference count is added to the * individual widgets in the focus chain. * * Retrieves the focus chain of the container, if one has been * set explicitly. If no focus chain has been explicitly * set, GTK+ computes the focus chain based on the positions * of the children. In that case, GTK+ stores %NULL in * @focusable_widgets and returns %FALSE. * * Returns: %TRUE if the focus chain of the container * has been set explicitly. **/ gboolean gtk_container_get_focus_chain (GtkContainer *container, GList **focus_chain) { GtkContainerPrivate *priv = gtk_container_get_instance_private (container); g_return_val_if_fail (GTK_IS_CONTAINER (container), FALSE); if (focus_chain) { if (priv->has_focus_chain) *focus_chain = g_list_copy (get_focus_chain (container)); else *focus_chain = NULL; } return priv->has_focus_chain; } /** * gtk_container_unset_focus_chain: * @container: a #GtkContainer * * Removes a focus chain explicitly set with gtk_container_set_focus_chain(). **/ void gtk_container_unset_focus_chain (GtkContainer *container) { GtkContainerPrivate *priv = gtk_container_get_instance_private (container); g_return_if_fail (GTK_IS_CONTAINER (container)); if (priv->has_focus_chain) { GList *chain; GList *tmp_list; chain = get_focus_chain (container); priv->has_focus_chain = FALSE; g_object_set_qdata (G_OBJECT (container), quark_focus_chain, NULL); tmp_list = chain; while (tmp_list != NULL) { g_signal_handlers_disconnect_by_func (tmp_list->data, chain_widget_destroyed, container); tmp_list = tmp_list->next; } g_list_free (chain); } } /** * gtk_container_set_focus_vadjustment: * @container: a #GtkContainer * @adjustment: an adjustment which should be adjusted when the focus * is moved among the descendents of @container * * Hooks up an adjustment to focus handling in a container, so when a * child of the container is focused, the adjustment is scrolled to * show that widget. This function sets the vertical alignment. See * gtk_scrolled_window_get_vadjustment() for a typical way of obtaining * the adjustment and gtk_container_set_focus_hadjustment() for setting * the horizontal adjustment. * * The adjustments have to be in pixel units and in the same coordinate * system as the allocation for immediate children of the container. */ void gtk_container_set_focus_vadjustment (GtkContainer *container, GtkAdjustment *adjustment) { g_return_if_fail (GTK_IS_CONTAINER (container)); if (adjustment) g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (adjustment) g_object_ref (adjustment); g_object_set_qdata_full (G_OBJECT (container), vadjustment_key_id, adjustment, g_object_unref); } /** * gtk_container_get_focus_vadjustment: * @container: a #GtkContainer * * Retrieves the vertical focus adjustment for the container. See * gtk_container_set_focus_vadjustment(). * * Returns: (nullable) (transfer none): the vertical focus adjustment, or * %NULL if none has been set. **/ GtkAdjustment * gtk_container_get_focus_vadjustment (GtkContainer *container) { GtkAdjustment *vadjustment; g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL); vadjustment = g_object_get_qdata (G_OBJECT (container), vadjustment_key_id); return vadjustment; } /** * gtk_container_set_focus_hadjustment: * @container: a #GtkContainer * @adjustment: an adjustment which should be adjusted when the focus is * moved among the descendents of @container * * Hooks up an adjustment to focus handling in a container, so when a child * of the container is focused, the adjustment is scrolled to show that * widget. This function sets the horizontal alignment. * See gtk_scrolled_window_get_hadjustment() for a typical way of obtaining * the adjustment and gtk_container_set_focus_vadjustment() for setting * the vertical adjustment. * * The adjustments have to be in pixel units and in the same coordinate * system as the allocation for immediate children of the container. */ void gtk_container_set_focus_hadjustment (GtkContainer *container, GtkAdjustment *adjustment) { g_return_if_fail (GTK_IS_CONTAINER (container)); if (adjustment) g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (adjustment) g_object_ref (adjustment); g_object_set_qdata_full (G_OBJECT (container), hadjustment_key_id, adjustment, g_object_unref); } /** * gtk_container_get_focus_hadjustment: * @container: a #GtkContainer * * Retrieves the horizontal focus adjustment for the container. See * gtk_container_set_focus_hadjustment (). * * Returns: (nullable) (transfer none): the horizontal focus adjustment, or %NULL if * none has been set. **/ GtkAdjustment * gtk_container_get_focus_hadjustment (GtkContainer *container) { GtkAdjustment *hadjustment; g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL); hadjustment = g_object_get_qdata (G_OBJECT (container), hadjustment_key_id); return hadjustment; } /** * gtk_container_get_path_for_child: * @container: a #GtkContainer * @child: a child of @container * * Returns a newly created widget path representing all the widget hierarchy * from the toplevel down to and including @child. * * Returns: A newly created #GtkWidgetPath **/ GtkWidgetPath * gtk_container_get_path_for_child (GtkContainer *container, GtkWidget *child) { GtkWidgetPath *path; g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL); g_return_val_if_fail (GTK_IS_WIDGET (child), NULL); g_return_val_if_fail (container == (GtkContainer *) _gtk_widget_get_parent (child), NULL); path = GTK_CONTAINER_GET_CLASS (container)->get_path_for_child (container, child); if (gtk_widget_path_get_object_type (path) != G_OBJECT_TYPE (child)) { g_critical ("%s %p returned a widget path for type %s, but child is %s", G_OBJECT_TYPE_NAME (container), container, g_type_name (gtk_widget_path_get_object_type (path)), G_OBJECT_TYPE_NAME (child)); } return path; }