gtk2/gtk/gtkcontainer.c
Matthias Clasen ea7a43beb4 container: Reduce boilerplate
We no longer need to hand-roll the type registration,
since we no longer install our own param spec pool.
2019-04-05 12:01:43 +00:00

815 lines
27 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* 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 <http://www.gnu.org/licenses/>.
*/
/*
* 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 "gtkbuildable.h"
#include "gtkbuilderprivate.h"
#include "gtkintl.h"
#include "gtkprivate.h"
#include "gtkmarshalers.h"
#include "gtksizerequest.h"
#include "gtkstylecontextprivate.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
//#include "gtkwindowprivate.h"
#include "a11y/gtkcontaineraccessibleprivate.h"
#include <gobject/gobjectnotifyqueue.c>
#include <gobject/gvaluecollector.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
/**
* 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
*/
struct _GtkContainerPrivate
{
guint resize_handler;
guint restyle_pending : 1;
};
enum {
ADD,
REMOVE,
LAST_SIGNAL
};
/* --- prototypes --- */
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_compute_expand (GtkWidget *widget,
gboolean *hexpand_p,
gboolean *vexpand_p);
static void gtk_container_real_set_focus_child (GtkContainer *container,
GtkWidget *widget);
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 GtkBuildableIface *parent_buildable_iface;
static GQuark vadjustment_key_id;
static GQuark hadjustment_key_id;
static guint container_signals[LAST_SIGNAL] = { 0 };
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GtkContainer, gtk_container, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkContainer)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_container_buildable_init))
static void
gtk_container_class_init (GtkContainerClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
vadjustment_key_id = g_quark_from_static_string ("gtk-vadjustment");
hadjustment_key_id = g_quark_from_static_string ("gtk-hadjustment");
widget_class->destroy = gtk_container_destroy;
widget_class->compute_expand = gtk_container_compute_expand;
widget_class->get_request_mode = gtk_container_get_request_mode;
class->add = gtk_container_add_unimplemented;
class->remove = gtk_container_remove_unimplemented;
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);
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_CONTAINER_ACCESSIBLE);
}
static void
gtk_container_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *type)
{
if (GTK_IS_WIDGET (child) &&
_gtk_widget_get_parent (GTK_WIDGET (child)) == NULL)
{
if (type)
GTK_BUILDER_WARN_INVALID_CHILD_TYPE (buildable, type);
else
gtk_container_add (GTK_CONTAINER (buildable), GTK_WIDGET (child));
}
else
{
parent_buildable_iface->add_child (buildable, builder, child, type);
}
}
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;
}
/**
* 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)
{
g_return_val_if_fail (GTK_IS_CONTAINER (container), 0);
if (GTK_CONTAINER_GET_CLASS (container)->child_type)
return GTK_CONTAINER_GET_CLASS (container)->child_type (container);
else
return G_TYPE_NONE;
}
static void
gtk_container_add_unimplemented (GtkContainer *container,
GtkWidget *widget)
{
g_warning ("GtkContainerClass::add not implemented for '%s'", G_OBJECT_TYPE_NAME (container));
}
static void
gtk_container_remove_unimplemented (GtkContainer *container,
GtkWidget *widget)
{
g_warning ("GtkContainerClass::remove not implemented for '%s'", G_OBJECT_TYPE_NAME (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;
gtk_container_foreach (container, (GtkCallback) gtk_widget_destroy, NULL);
GTK_WIDGET_CLASS (gtk_container_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 #GtkGrid, this function will
* pick default packing parameters that may not be correct. So
* consider functions such as 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 cant 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_OBJECT_TYPE_NAME (widget),
G_OBJECT_TYPE_NAME (container),
G_OBJECT_TYPE_NAME (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 dont want to use @widget
* again its 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)))
{
if (GTK_IS_WINDOW (container))
gtk_window_check_resize (GTK_WINDOW (container));
else
g_warning ("gtk_container_idle_sizer() called on a non-window");
}
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);
}
}
void
gtk_container_start_idle_sizer (GtkContainer *container)
{
GtkContainerPrivate *priv = gtk_container_get_instance_private (container);
GdkFrameClock *clock;
if (priv->resize_handler != 0)
return;
if (!gtk_container_needs_idle_sizer (container))
return;
clock = gtk_widget_get_frame_clock (GTK_WIDGET (container));
if (clock == NULL)
return;
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 (gtk_widget_get_frame_clock (GTK_WIDGET (container)),
priv->resize_handler);
priv->resize_handler = 0;
}
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;
priv->restyle_pending = TRUE;
gtk_container_start_idle_sizer (container);
}
static GtkSizeRequestMode
gtk_container_get_request_mode (GtkWidget *widget)
{
GtkWidget *w;
int wfh = 0, hfw = 0;
for (w = gtk_widget_get_first_child (widget);
w != NULL;
w = gtk_widget_get_next_sibling (w))
{
GtkSizeRequestMode mode = gtk_widget_get_request_mode (w);
switch (mode)
{
case GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH:
hfw ++;
break;
case GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT:
wfh ++;
break;
case GTK_SIZE_REQUEST_CONSTANT_SIZE:
default:
break;
}
}
if (hfw == 0 && wfh == 0)
return GTK_SIZE_REQUEST_CONSTANT_SIZE;
else
return wfh > 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 werent 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.
*
* It is permissible to remove the child from the @callback handler.
*
* Most applications should use gtk_container_foreach(),
* rather than gtk_container_forall().
**/
void
gtk_container_foreach (GtkContainer *container,
GtkCallback callback,
gpointer callback_data)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (callback != NULL);
if (GTK_CONTAINER_GET_CLASS (container)->forall)
GTK_CONTAINER_GET_CLASS (container)->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));
GTK_CONTAINER_GET_CLASS (container)->set_focus_child (container, child);
}
/**
* gtk_container_get_children:
* @container: a #GtkContainer
*
* Returns the containers 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 containers 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);
}
static void
gtk_container_compute_expand (GtkWidget *widget,
gboolean *hexpand_p,
gboolean *vexpand_p)
{
GtkWidget *w;
gboolean hexpand = FALSE;
gboolean vexpand = FALSE;
for (w = gtk_widget_get_first_child (widget);
w != NULL;
w = gtk_widget_get_next_sibling (w))
{
/* 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.
*/
hexpand = hexpand || gtk_widget_compute_expand (w, GTK_ORIENTATION_HORIZONTAL);
vexpand = vexpand || gtk_widget_compute_expand (w, GTK_ORIENTATION_VERTICAL);
}
*hexpand_p = hexpand;
*vexpand_p = 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;
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;
graphene_rect_t child_bounds;
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;
if (!gtk_widget_compute_bounds (child, child, &child_bounds))
return;
if (vadj)
gtk_adjustment_clamp_page (vadj, y, y + child_bounds.size.height);
if (hadj)
gtk_adjustment_clamp_page (hadj, x, x + child_bounds.size.width);
}
}
}
static GtkWidgetPath *
gtk_container_real_get_path_for_child (GtkContainer *container,
GtkWidget *child)
{
GtkWidgetPath *path;
path = _gtk_widget_create_path (GTK_WIDGET (container));
gtk_widget_path_append_for_widget (path, child);
return path;
}
static void
gtk_container_children_callback (GtkWidget *widget,
gpointer client_data)
{
GList **children;
children = (GList**) client_data;
*children = g_list_prepend (*children, widget);
}
/**
* 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;
}