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gtk2/gtk/gtkcontainer.c
William Jon McCann 37a8ee6e95 docs: fully break lines in examples 
Try to do a better job of keeping example content
from being too wide. It is often rendered as <pre>
text so the only time we can wrap it is in the source.

It is best to full break lines at all punctuation and
to try to keep the width under 70 chars or so.
2014-02-12 18:42:50 -05:00

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/* 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 "gtkcontainer.h"
#include "gtkcontainerprivate.h"
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <gobject/gobjectnotifyqueue.c>
#include <gobject/gvaluecollector.h>
#include "gtkadjustment.h"
#include "gtkbuildable.h"
#include "gtkbuilderprivate.h"
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtksizerequest.h"
#include "gtksizerequestcacheprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkwindow.h"
#include "gtkassistant.h"
#include "gtkintl.h"
#include "gtkstylecontextprivate.h"
#include "gtkwidgetpath.h"
#include "a11y/gtkcontaineraccessible.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 #GtkHBox arranges its
* children in a horizontal row, and a #GtkGrid arranges the widgets it contains
* in a two-dimensional grid.
*
* # Height for width geometry management
*
* GTK+ uses a height-for-width (and width-for-height) geometry management system.
* Height-for-width means that a widget can change how much vertical space it needs,
* depending on the amount of horizontal space that it is given (and similar for
* width-for-height).
*
* There are some things to keep in mind when implementing container widgets
* that make use of GTK+’s height for width geometry management system. First,
* it’s important to note that a container must prioritize one of its
* dimensions, that is to say that a widget or container can only have a
* #GtkSizeRequestMode that is %GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH or
* %GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT. However, every widget and container
* must be able to respond to the APIs for both dimensions, i.e. even if a
* widget has a request mode that is height-for-width, it is possible that
* its parent will request its sizes using the width-for-height APIs.
*
* To ensure that everything works properly, here are some guidelines to follow
* when implementing height-for-width (or width-for-height) containers.
*
* Each request mode involves 2 virtual methods. Height-for-width apis run
* through gtk_widget_get_preferred_width() and then through gtk_widget_get_preferred_height_for_width().
* When handling requests in the opposite #GtkSizeRequestMode it is important that
* every widget request at least enough space to display all of its content at all times.
*
* When gtk_widget_get_preferred_height() is called on a container that is height-for-width,
* the container must return the height for its minimum width. This is easily achieved by
* simply calling the reverse apis implemented for itself as follows:
*
* |[<!-- language="C" -->
* static void
* foo_container_get_preferred_height (GtkWidget *widget,
* gint *min_height,
* gint *nat_height)
* {
* if (i_am_in_height_for_width_mode)
* {
* gint min_width;
*
* GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget,
* &min_width,
* NULL);
* GTK_WIDGET_GET_CLASS (widget)->get_preferred_height_for_width
* (widget,
* min_width,
* min_height,
* nat_height);
* }
* else
* {
* ... many containers support both request modes, execute the
* real width-for-height request here by returning the
* collective heights of all widgets that are stacked
* vertically (or whatever is appropriate for this container)
* ...
* }
* }
* ]|
*
* Similarly, when gtk_widget_get_preferred_width_for_height() is called for a container or widget
* that is height-for-width, it then only needs to return the base minimum width like so:
*
* |[<!-- language="C" -->
* static void
* foo_container_get_preferred_width_for_height (GtkWidget *widget,
* gint for_height,
* gint *min_width,
* gint *nat_width)
* {
* if (i_am_in_height_for_width_mode)
* {
* GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget,
* min_width,
* nat_width);
* }
* else
* {
* ... execute the real width-for-height request here based on
* the required width of the children collectively if the
* container were to be allocated the said height ...
* }
* }
* ]|
*
* Height for width requests are generally implemented in terms of a virtual allocation
* of widgets in the input orientation. Assuming an height-for-width request mode, a container
* would implement the get_preferred_height_for_width() virtual function by first calling
* gtk_widget_get_preferred_width() for each of its children.
*
* For each potential group of children that are lined up horizontally, the values returned by
* gtk_widget_get_preferred_width() should be collected in an array of #GtkRequestedSize structures.
* Any child spacing should be removed from the input @for_width and then the collective size should be
* allocated using the gtk_distribute_natural_allocation() convenience function.
*
* The container will then move on to request the preferred height for each child by using
* gtk_widget_get_preferred_height_for_width() and using the sizes stored in the #GtkRequestedSize array.
*
* To allocate a height-for-width container, it’s again important
* to consider that a container must prioritize one dimension over the other. So if
* a container is a height-for-width container it must first allocate all widgets horizontally
* using a #GtkRequestedSize array and gtk_distribute_natural_allocation() and then add any
* extra space (if and where appropriate) for the widget to expand.
*
* After adding all the expand space, the container assumes it was allocated sufficient
* height to fit all of its content. At this time, the container must use the total horizontal sizes
* of each widget to request the height-for-width of each of its children and store the requests in a
* #GtkRequestedSize array for any widgets that stack vertically (for tabular containers this can
* be generalized into the heights and widths of rows and columns).
* The vertical space must then again be distributed using gtk_distribute_natural_allocation()
* while this time considering the allocated height of the widget minus any vertical spacing
* that the container adds. Then vertical expand space should be added where appropriate and available
* and the container should go on to actually allocating the child widgets.
*
* See [GtkWidget’s geometry management section][geometry-management]
* to learn more about implementing height-for-width geometry management for widgets.
*
* # 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 <packing> element for children, which can contain multiple <property>
* elements that specify child properties for the child.
*
* An example of child properties in UI definitions:
* |[
* <object class="GtkVBox">
* <child>
* <object class="GtkLabel"/>
* <packing>
* <property name="pack-type">start</property>
* </packing>
* </child>
* </object>
* ]|
*
* 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.
*/
struct _GtkContainerPrivate
{
GtkWidget *focus_child;
GdkFrameClock *resize_clock;
guint resize_handler;
guint border_width : 16;
guint has_focus_chain : 1;
guint reallocate_redraws : 1;
guint resize_pending : 1;
guint restyle_pending : 1;
guint resize_mode : 2;
guint request_mode : 2;
};
enum {
ADD,
REMOVE,
CHECK_RESIZE,
SET_FOCUS_CHILD,
LAST_SIGNAL
};
enum {
PROP_0,
PROP_BORDER_WIDTH,
PROP_RESIZE_MODE,
PROP_CHILD
};
#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_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_container_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
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 void gtk_container_show_all (GtkWidget *widget);
static gint gtk_container_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_container_map (GtkWidget *widget);
static void gtk_container_unmap (GtkWidget *widget);
static void gtk_container_adjust_size_request (GtkWidget *widget,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size);
static void gtk_container_adjust_baseline_request (GtkWidget *widget,
gint *minimum_baseline,
gint *natural_baseline);
static void gtk_container_adjust_size_allocation (GtkWidget *widget,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size,
gint *allocated_pos,
gint *allocated_size);
static void gtk_container_adjust_baseline_allocation (GtkWidget *widget,
gint *baseline);
static GtkSizeRequestMode gtk_container_get_request_mode (GtkWidget *widget);
static gchar* gtk_container_child_default_composite_name (GtkContainer *container,
GtkWidget *child);
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 gboolean gtk_container_should_propagate_draw (GtkContainer *container,
GtkWidget *child,
cairo_t *cr);
/* --- variables --- */
static const gchar vadjustment_key[] = "gtk-vadjustment";
static guint vadjustment_key_id = 0;
static const gchar hadjustment_key[] = "gtk-hadjustment";
static guint hadjustment_key_id = 0;
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 (vadjustment_key);
hadjustment_key_id = g_quark_from_static_string (hadjustment_key);
gobject_class->set_property = gtk_container_set_property;
gobject_class->get_property = gtk_container_get_property;
widget_class->destroy = gtk_container_destroy;
widget_class->compute_expand = gtk_container_compute_expand;
widget_class->show_all = gtk_container_show_all;
widget_class->draw = gtk_container_draw;
widget_class->map = gtk_container_map;
widget_class->unmap = gtk_container_unmap;
widget_class->focus = gtk_container_focus;
widget_class->adjust_size_request = gtk_container_adjust_size_request;
widget_class->adjust_baseline_request = gtk_container_adjust_baseline_request;
widget_class->adjust_size_allocation = gtk_container_adjust_size_allocation;
widget_class->adjust_baseline_allocation = gtk_container_adjust_baseline_allocation;
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->composite_name = gtk_container_child_default_composite_name;
class->get_path_for_child = gtk_container_real_get_path_for_child;
g_object_class_install_property (gobject_class,
PROP_RESIZE_MODE,
g_param_spec_enum ("resize-mode",
P_("Resize mode"),
P_("Specify how resize events are handled"),
GTK_TYPE_RESIZE_MODE,
GTK_RESIZE_PARENT,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_BORDER_WIDTH,
g_param_spec_uint ("border-width",
P_("Border width"),
P_("The width of the empty border outside the containers children"),
0,
65535,
0,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_CHILD,
g_param_spec_object ("child",
P_("Child"),
P_("Can be used to add a new child to the container"),
GTK_TYPE_WIDGET,
GTK_PARAM_WRITABLE));
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,
_gtk_marshal_VOID__OBJECT,
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,
_gtk_marshal_VOID__OBJECT,
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,
_gtk_marshal_VOID__VOID,
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,
_gtk_marshal_VOID__OBJECT,
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;
}
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 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;
if (gtk_widget_get_parent (child) != (GtkWidget *)container && !GTK_IS_ASSISTANT (container) && !GTK_IS_ACTION_BAR (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 property called %s",
g_type_name (G_OBJECT_TYPE (container)), name);
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;
}
gtk_container_child_set_property (container, child, name, &gvalue);
g_value_unset (&gvalue);
}
typedef struct {
GtkBuilder *builder;
GtkContainer *container;
GtkWidget *child;
GString *string;
gchar *child_prop_name;
gchar *context;
gboolean translatable;
} PackingPropertiesData;
static void
attributes_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **names,
const gchar **values,
gpointer user_data,
GError **error)
{
PackingPropertiesData *parser_data = (PackingPropertiesData*)user_data;
guint i;
if (strcmp (element_name, "property") == 0)
{
for (i = 0; names[i]; i++)
if (strcmp (names[i], "name") == 0)
parser_data->child_prop_name = g_strdup (values[i]);
else if (strcmp (names[i], "translatable") == 0)
{
if (!_gtk_builder_boolean_from_string (values[1],
&parser_data->translatable,
error))
return;
}
else if (strcmp (names[i], "comments") == 0)
; /* for translators */
else if (strcmp (names[i], "context") == 0)
parser_data->context = g_strdup (values[1]);
else
g_warning ("Unsupported attribute for GtkContainer Child "
"property: %s\n", names[i]);
}
else if (strcmp (element_name, "packing") == 0)
return;
else
g_warning ("Unsupported tag for GtkContainer: %s\n", element_name);
}
static void
attributes_text_element (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
PackingPropertiesData *parser_data = (PackingPropertiesData*)user_data;
if (parser_data->child_prop_name)
g_string_append_len (parser_data->string, text, text_len);
}
static void
attributes_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
PackingPropertiesData *parser_data = (PackingPropertiesData*)user_data;
/* translate the string */
if (parser_data->string->len && parser_data->translatable)
{
const gchar *translated;
const gchar *domain;
domain = gtk_builder_get_translation_domain (parser_data->builder);
translated = _gtk_builder_parser_translate (domain,
parser_data->context,
parser_data->string->str);
g_string_assign (parser_data->string, translated);
}
if (parser_data->child_prop_name)
gtk_container_buildable_set_child_property (parser_data->container,
parser_data->builder,
parser_data->child,
parser_data->child_prop_name,
parser_data->string->str);
g_string_set_size (parser_data->string, 0);
g_free (parser_data->child_prop_name);
g_free (parser_data->context);
parser_data->child_prop_name = NULL;
parser_data->context = NULL;
parser_data->translatable = FALSE;
}
static const GMarkupParser attributes_parser =
{
attributes_start_element,
attributes_end_element,
attributes_text_element,
};
static gboolean
gtk_container_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
GMarkupParser *parser,
gpointer *data)
{
PackingPropertiesData *parser_data;
if (parent_buildable_iface->custom_tag_start (buildable, builder, child,
tagname, parser, data))
return TRUE;
if (child && strcmp (tagname, "packing") == 0)
{
parser_data = g_slice_new0 (PackingPropertiesData);
parser_data->string = g_string_new ("");
parser_data->builder = builder;
parser_data->container = GTK_CONTAINER (buildable);
parser_data->child = GTK_WIDGET (child);
parser_data->child_prop_name = NULL;
*parser = attributes_parser;
*data = parser_data;
return TRUE;
}
return FALSE;
}
static void
gtk_container_buildable_custom_tag_end (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
gpointer *data)
{
if (strcmp (tagname, "packing") == 0)
{
PackingPropertiesData *parser_data = (PackingPropertiesData*)data;
g_string_free (parser_data->string, TRUE);
g_slice_free (PackingPropertiesData, parser_data);
return;
}
if (parent_buildable_iface->custom_tag_end)
parent_buildable_iface->custom_tag_end (buildable, builder,
child, tagname, 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.
*
* Return value: 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 widget.
*
* This is an analogue of g_object_notify() for child properties.
*
* Also see gtk_widget_child_notify().
*
* Since: 3.2
*/
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);
}
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);
}
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);
}
/**
* 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);
}
/**
* 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);
if (g_param_spec_pool_lookup (_gtk_widget_child_property_pool, pspec->name, G_OBJECT_CLASS_TYPE (cclass), FALSE))
{
g_warning (G_STRLOC ": class `%s' already contains a child property named `%s'",
G_OBJECT_CLASS_NAME (cclass),
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_OBJECT_CLASS_TYPE (cclass));
}
/**
* 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: (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)
{
GtkContainerPrivate *priv;
container->priv = gtk_container_get_instance_private (container);
priv = container->priv;
priv->focus_child = NULL;
priv->border_width = 0;
priv->resize_mode = GTK_RESIZE_PARENT;
priv->reallocate_redraws = FALSE;
}
static void
gtk_container_destroy (GtkWidget *widget)
{
GtkContainer *container = GTK_CONTAINER (widget);
GtkContainerPrivate *priv = container->priv;
if (priv->resize_pending)
_gtk_container_dequeue_resize_handler (container);
if (priv->restyle_pending)
priv->restyle_pending = FALSE;
if (priv->focus_child)
{
g_object_unref (priv->focus_child);
priv->focus_child = NULL;
}
/* 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);
}
static void
gtk_container_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkContainer *container = GTK_CONTAINER (object);
switch (prop_id)
{
case PROP_BORDER_WIDTH:
gtk_container_set_border_width (container, g_value_get_uint (value));
break;
case PROP_RESIZE_MODE:
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
gtk_container_set_resize_mode (container, g_value_get_enum (value));
G_GNUC_END_IGNORE_DEPRECATIONS;
break;
case PROP_CHILD:
gtk_container_add (container, GTK_WIDGET (g_value_get_object (value)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_container_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkContainer *container = GTK_CONTAINER (object);
GtkContainerPrivate *priv = container->priv;
switch (prop_id)
{
case PROP_BORDER_WIDTH:
g_value_set_uint (value, priv->border_width);
break;
case PROP_RESIZE_MODE:
g_value_set_enum (value, priv->resize_mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gtk_container_set_border_width:
* @container: a #GtkContainer
* @border_width: amount of blank space to leave outside
* the container. Valid values are in the range 0-65535 pixels.
*
* Sets the border width of the container.
*
* The border width of a container is the amount of space to leave
* around the outside of the container. The only exception to this is
* #GtkWindow; because toplevel windows can’t leave space outside,
* they leave the space inside. The border is added on all sides of
* the container. To add space to only one side, one approach is to
* create a #GtkAlignment widget, call gtk_widget_set_size_request()
* to give it a size, and place it on the side of the container as
* a spacer.
**/
void
gtk_container_set_border_width (GtkContainer *container,
guint border_width)
{
GtkContainerPrivate *priv;
g_return_if_fail (GTK_IS_CONTAINER (container));
priv = container->priv;
if (priv->border_width != border_width)
{
priv->border_width = border_width;
g_object_notify (G_OBJECT (container), "border-width");
if (gtk_widget_get_realized (GTK_WIDGET (container)))
gtk_widget_queue_resize (GTK_WIDGET (container));
}
}
/**
* gtk_container_get_border_width:
* @container: a #GtkContainer
*
* Retrieves the border width of the container. See
* gtk_container_set_border_width().
*
* Return value: the current border width
**/
guint
gtk_container_get_border_width (GtkContainer *container)
{
g_return_val_if_fail (GTK_IS_CONTAINER (container), 0);
return container->priv->border_width;
}
/**
* 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 use gtk_widget_reparent()" ,
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_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 while it’s not inside
* 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_return_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (container) || GTK_IS_ASSISTANT (container) || GTK_IS_ACTION_BAR (container));
g_signal_emit (container, container_signals[REMOVE], 0, widget);
}
void
_gtk_container_dequeue_resize_handler (GtkContainer *container)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (container->priv->resize_pending);
container->priv->resize_pending = FALSE;
}
/**
* gtk_container_set_resize_mode:
* @container: a #GtkContainer
* @resize_mode: the new resize mode
*
* Sets the resize mode for the container.
*
* The resize mode of a container determines whether a resize request
* will be passed to the container’s parent, queued for later execution
* or executed immediately.
*
* Deprecated: 3.12: Resize modes are deprecated. They aren’t necessary
* anymore since frame clocks and might introduce obscure bugs if
* used.
**/
void
gtk_container_set_resize_mode (GtkContainer *container,
GtkResizeMode resize_mode)
{
GtkContainerPrivate *priv;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (resize_mode <= GTK_RESIZE_IMMEDIATE);
priv = container->priv;
if (gtk_widget_is_toplevel (GTK_WIDGET (container)) &&
resize_mode == GTK_RESIZE_PARENT)
{
resize_mode = GTK_RESIZE_QUEUE;
}
if (priv->resize_mode != resize_mode)
{
priv->resize_mode = resize_mode;
gtk_widget_queue_resize (GTK_WIDGET (container));
g_object_notify (G_OBJECT (container), "resize-mode");
}
}
/**
* gtk_container_get_resize_mode:
* @container: a #GtkContainer
*
* Returns the resize mode for the container. See
* gtk_container_set_resize_mode ().
*
* Return value: the current resize mode
*
* Deprecated: 3.12: Resize modes are deprecated. They aren’t necessary
* anymore since frame clocks and might introduce obscure bugs if
* used.
**/
GtkResizeMode
gtk_container_get_resize_mode (GtkContainer *container)
{
g_return_val_if_fail (GTK_IS_CONTAINER (container), GTK_RESIZE_PARENT);
return container->priv->resize_mode;
}
/**
* gtk_container_set_reallocate_redraws:
* @container: a #GtkContainer
* @needs_redraws: the new value for the container’s @reallocate_redraws flag
*
* Sets the @reallocate_redraws flag of the container to the given value.
*
* Containers requesting reallocation redraws get automatically
* redrawn if any of their children changed allocation.
**/
void
gtk_container_set_reallocate_redraws (GtkContainer *container,
gboolean needs_redraws)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
container->priv->reallocate_redraws = needs_redraws ? TRUE : FALSE;
}
static void
gtk_container_idle_sizer (GdkFrameClock *clock,
GtkContainer *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 (container->priv->restyle_pending)
{
GtkBitmask *empty;
gint64 current_time;
empty = _gtk_bitmask_new ();
current_time = g_get_monotonic_time ();
container->priv->restyle_pending = FALSE;
_gtk_style_context_validate (gtk_widget_get_style_context (GTK_WIDGET (container)),
current_time,
0,
empty);
_gtk_bitmask_free (empty);
}
/* 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 (container->priv->resize_pending)
{
container->priv->resize_pending = FALSE;
gtk_container_check_resize (container);
}
if (!container->priv->restyle_pending && !container->priv->resize_pending)
{
_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)
{
GdkFrameClock *clock;
if (container->priv->resize_handler != 0)
return;
clock = gtk_widget_get_frame_clock (GTK_WIDGET (container));
if (clock == NULL)
return;
container->priv->resize_clock = clock;
container->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)
{
if (container->priv->resize_handler == 0)
return;
g_signal_handler_disconnect (container->priv->resize_clock,
container->priv->resize_handler);
container->priv->resize_handler = 0;
container->priv->resize_clock = NULL;
}
static void
gtk_container_queue_resize_handler (GtkContainer *container)
{
GtkWidget *widget;
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
g_return_if_fail (GTK_IS_RESIZE_CONTAINER (container));
G_GNUC_END_IGNORE_DEPRECATIONS;
widget = GTK_WIDGET (container);
if (gtk_widget_get_visible (widget) &&
(gtk_widget_is_toplevel (widget) ||
gtk_widget_get_realized (widget)))
{
switch (container->priv->resize_mode)
{
case GTK_RESIZE_QUEUE:
if (!container->priv->resize_pending)
{
container->priv->resize_pending = TRUE;
gtk_container_start_idle_sizer (container);
}
break;
case GTK_RESIZE_IMMEDIATE:
gtk_container_check_resize (container);
break;
case GTK_RESIZE_PARENT:
default:
g_assert_not_reached ();
break;
}
}
}
static void
_gtk_container_queue_resize_internal (GtkContainer *container,
gboolean invalidate_only)
{
GtkWidget *widget;
g_return_if_fail (GTK_IS_CONTAINER (container));
widget = GTK_WIDGET (container);
do
{
_gtk_widget_set_alloc_needed (widget, TRUE);
_gtk_size_request_cache_clear (_gtk_widget_peek_request_cache (widget));
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
if (GTK_IS_RESIZE_CONTAINER (widget))
break;
G_GNUC_END_IGNORE_DEPRECATIONS;
widget = gtk_widget_get_parent (widget);
}
while (widget);
if (widget && !invalidate_only)
gtk_container_queue_resize_handler (GTK_CONTAINER (widget));
}
void
_gtk_container_queue_restyle (GtkContainer *container)
{
GtkContainerPrivate *priv;
g_return_if_fail (GTK_CONTAINER (container));
priv = container->priv;
if (priv->restyle_pending)
return;
gtk_container_start_idle_sizer (container);
priv->restyle_pending = TRUE;
}
/**
* _gtk_container_queue_resize:
* @container: a #GtkContainer
*
* Determines the “resize container” in the hierarchy above this container
* (typically the toplevel, but other containers can be set as resize
* containers with gtk_container_set_resize_mode()), marks the container
* and all parents up to and including the resize container as needing
* to have sizes recomputed, and if necessary adds the resize container
* to the queue of containers that will be resized out at idle.
*/
void
_gtk_container_queue_resize (GtkContainer *container)
{
_gtk_container_queue_resize_internal (container, FALSE);
}
/**
* _gtk_container_resize_invalidate:
* @container: a #GtkContainer
*
* Invalidates cached sizes like _gtk_container_queue_resize() but doesn't
* actually queue the resize container for resize.
*/
void
_gtk_container_resize_invalidate (GtkContainer *container)
{
_gtk_container_queue_resize_internal (container, TRUE);
}
void
_gtk_container_maybe_start_idle_sizer (GtkContainer *container)
{
if (container->priv->restyle_pending || container->priv->resize_pending)
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;
gtk_widget_get_preferred_size (widget,
&requisition, NULL);
gtk_widget_get_allocation (widget, &allocation);
if (requisition.width > allocation.width ||
requisition.height > allocation.height)
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
if (GTK_IS_RESIZE_CONTAINER (container))
{
gtk_widget_size_allocate (widget, &allocation);
gtk_widget_set_allocation (widget, &allocation);
}
else
gtk_widget_queue_resize (widget);
G_GNUC_END_IGNORE_DEPRECATIONS;
}
else
{
gtk_widget_size_allocate (widget, &allocation);
gtk_widget_set_allocation (widget, &allocation);
}
}
/* The container hasn't changed size but one of its children
* queued a resize request. Which means that the allocation
* is not sufficient for the requisition of some child.
* We’ve already performed a size request at this point,
* so we simply need to reallocate and let the allocation
* trickle down via GTK_WIDGET_ALLOC_NEEDED flags.
*/
/**
* gtk_container_resize_children:
* @container: a #GtkContainer
*
* Deprecated: 3.10
**/
void
gtk_container_resize_children (GtkContainer *container)
{
GtkAllocation allocation;
GtkWidget *widget;
/* resizing invariants:
* toplevels have *always* resize_mode != GTK_RESIZE_PARENT set.
* containers that have an idle sizer pending must be flagged with
* RESIZE_PENDING.
*/
g_return_if_fail (GTK_IS_CONTAINER (container));
widget = GTK_WIDGET (container);
gtk_widget_get_allocation (widget, &allocation);
gtk_widget_size_allocate (widget, &allocation);
gtk_widget_set_allocation (widget, &allocation);
}
static void
gtk_container_adjust_size_request (GtkWidget *widget,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size)
{
GtkContainer *container;
container = GTK_CONTAINER (widget);
if (GTK_CONTAINER_GET_CLASS (widget)->_handle_border_width)
{
int border_width;
border_width = container->priv->border_width;
*minimum_size += border_width * 2;
*natural_size += border_width * 2;
}
/* chain up last so gtk_widget_set_size_request() values
* will have a chance to overwrite our border width.
*/
parent_class->adjust_size_request (widget, orientation,
minimum_size, natural_size);
}
static void
gtk_container_adjust_baseline_request (GtkWidget *widget,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkContainer *container;
container = GTK_CONTAINER (widget);
if (GTK_CONTAINER_GET_CLASS (widget)->_handle_border_width)
{
int border_width;
border_width = container->priv->border_width;
*minimum_baseline += border_width;
*natural_baseline += border_width;
}
parent_class->adjust_baseline_request (widget, minimum_baseline, natural_baseline);
}
static void
gtk_container_adjust_size_allocation (GtkWidget *widget,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size,
gint *allocated_pos,
gint *allocated_size)
{
GtkContainer *container;
int border_width;
container = GTK_CONTAINER (widget);
if (GTK_CONTAINER_GET_CLASS (widget)->_handle_border_width)
{
border_width = container->priv->border_width;
*allocated_size -= border_width * 2;
*allocated_pos += border_width;
*minimum_size -= border_width * 2;
*natural_size -= border_width * 2;
}
/* Chain up to GtkWidgetClass *after* removing our border width from
* the proposed allocation size. This is because it's possible that the
* widget was allocated more space than it needs in a said orientation,
* if GtkWidgetClass does any alignments and thus limits the size to the
* natural size... then we need that to be done *after* removing any margins
* and padding values.
*/
parent_class->adjust_size_allocation (widget, orientation,
minimum_size, natural_size, allocated_pos,
allocated_size);
}
static void
gtk_container_adjust_baseline_allocation (GtkWidget *widget,
gint *baseline)
{
GtkContainer *container;
int border_width;
container = GTK_CONTAINER (widget);
if (GTK_CONTAINER_GET_CLASS (widget)->_handle_border_width)
{
border_width = container->priv->border_width;
if (*baseline >= 0)
*baseline -= border_width;
}
parent_class->adjust_baseline_allocation (widget, baseline);
}
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_class_handle_border_width:
* @klass: the class struct of a #GtkContainer subclass
*
* Modifies a subclass of #GtkContainerClass to automatically add and
* remove the border-width setting on GtkContainer. This allows the
* subclass to ignore the border width in its size request and
* allocate methods. The intent is for a subclass to invoke this
* in its class_init function.
*
* gtk_container_class_handle_border_width() is necessary because it
* would break API too badly to make this behavior the default. So
* subclasses must “opt in” to the parent class handling border_width
* for them.
*/
void
gtk_container_class_handle_border_width (GtkContainerClass *klass)
{
g_return_if_fail (GTK_IS_CONTAINER_CLASS (klass));
klass->_handle_border_width = TRUE;
}
/**
* 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 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)
{
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, TRUE, 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. 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, FALSE, 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 manualy 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_focus_child:
* @container: a #GtkContainer
*
* Returns the current focus child widget inside @container. This is not the
* currently focused widget. That can be obtained by calling
* gtk_window_get_focus().
*
* Returns: (transfer none): The child widget which will receive the
* focus inside @container when the @conatiner is focussed,
* or %NULL if none is set.
*
* Since: 2.14
**/
GtkWidget *
gtk_container_get_focus_child (GtkContainer *container)
{
g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL);
return container->priv->focus_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.
*
* Return value: (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);
}
static void
gtk_container_child_position_callback (GtkWidget *widget,
gpointer client_data)
{
struct {
GtkWidget *child;
guint i;
guint index;
} *data = client_data;
data->i++;
if (data->child == widget)
data->index = data->i;
}
static gchar*
gtk_container_child_default_composite_name (GtkContainer *container,
GtkWidget *child)
{
struct {
GtkWidget *child;
guint i;
guint index;
} data;
gchar *name;
/* fallback implementation */
data.child = child;
data.i = 0;
data.index = 0;
gtk_container_forall (container,
gtk_container_child_position_callback,
&data);
name = g_strdup_printf ("%s-%u",
g_type_name (G_TYPE_FROM_INSTANCE (child)),
data.index);
return name;
}
gchar*
_gtk_container_child_composite_name (GtkContainer *container,
GtkWidget *child)
{
gboolean composite_child;
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 (gtk_widget_get_parent (child) == GTK_WIDGET (container), NULL);
g_object_get (child, "composite-child", &composite_child, NULL);
if (composite_child)
{
static GQuark quark_composite_name = 0;
gchar *name;
if (!quark_composite_name)
quark_composite_name = g_quark_from_static_string ("gtk-composite-name");
name = g_object_get_qdata (G_OBJECT (child), quark_composite_name);
if (!name)
{
GtkContainerClass *class;
class = GTK_CONTAINER_GET_CLASS (container);
if (class->composite_name)
name = class->composite_name (container, child);
}
else
name = g_strdup (name);
return name;
}
return NULL;
}
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 *child)
{
GtkContainerPrivate *priv;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (child == NULL || GTK_IS_WIDGET (child));
priv = container->priv;
if (child != priv->focus_child)
{
if (priv->focus_child)
g_object_unref (priv->focus_child);
priv->focus_child = child;
if (priv->focus_child)
g_object_ref (priv->focus_child);
}
/* check for h/v adjustments
*/
if (priv->focus_child)
{
GtkAdjustment *hadj;
GtkAdjustment *vadj;
GtkAllocation allocation;
GtkWidget *focus_child;
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)
{
focus_child = priv->focus_child;
while (GTK_IS_CONTAINER (focus_child) && gtk_container_get_focus_child (GTK_CONTAINER (focus_child)))
{
focus_child = gtk_container_get_focus_child (GTK_CONTAINER (focus_child));
}
gtk_widget_translate_coordinates (focus_child, priv->focus_child,
0, 0, &x, &y);
gtk_widget_get_allocation (priv->focus_child, &allocation);
x += allocation.x;
y += allocation.y;
gtk_widget_get_allocation (focus_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_data (G_OBJECT (container), "gtk-container-focus-chain");
}
/* same as gtk_container_get_children, except it includes internals
*/
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)
{
GtkStyleContext *context;
GtkWidgetPath *path;
GList *classes;
context = gtk_widget_get_style_context (GTK_WIDGET (container));
path = _gtk_widget_create_path (GTK_WIDGET (container));
/* Copy any permanent classes to the path */
classes = gtk_style_context_list_classes (context);
while (classes)
{
GList *cur;
cur = classes;
classes = classes->next;
gtk_widget_path_iter_add_class (path, -1, cur->data);
g_list_free_1 (cur);
}
gtk_widget_path_append_for_widget (path, child);
return path;
}
static gboolean
gtk_container_focus (GtkWidget *widget,
GtkDirectionType direction)
{
GList *children;
GList *sorted_children;
gint return_val;
GtkContainer *container;
GtkContainerPrivate *priv;
g_return_val_if_fail (GTK_IS_CONTAINER (widget), FALSE);
container = GTK_CONTAINER (widget);
priv = container->priv;
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_container_get_focus_child (GTK_CONTAINER (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.
*
* Return value: 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);
}
g_assert_not_reached ();
return NULL;
}
static gboolean
gtk_container_focus_move (GtkContainer *container,
GList *children,
GtkDirectionType direction)
{
GtkContainerPrivate *priv = container->priv;
GtkWidget *focus_child;
GtkWidget *child;
focus_child = priv->focus_child;
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_data (G_OBJECT (container),
"gtk-container-focus-chain");
chain = g_list_remove (chain, widget);
g_signal_handlers_disconnect_by_func (widget,
chain_widget_destroyed,
user_data);
g_object_set_data (G_OBJECT (container),
I_("gtk-container-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)
{
GList *chain;
GList *tmp_list;
GtkContainerPrivate *priv;
g_return_if_fail (GTK_IS_CONTAINER (container));
priv = container->priv;
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 = g_list_next (tmp_list);
}
chain = g_list_reverse (chain);
g_object_set_data (G_OBJECT (container),
I_("gtk-container-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.
*
* Return value: %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;
g_return_val_if_fail (GTK_IS_CONTAINER (container), FALSE);
priv = container->priv;
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;
g_return_if_fail (GTK_IS_CONTAINER (container));
priv = container->priv;
if (priv->has_focus_chain)
{
GList *chain;
GList *tmp_list;
chain = get_focus_chain (container);
priv->has_focus_chain = FALSE;
g_object_set_data (G_OBJECT (container),
I_("gtk-container-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 = g_list_next (tmp_list);
}
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().
*
* Return value: (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 ().
*
* Return value: (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;
}
static void
gtk_container_show_all (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_CONTAINER (widget));
gtk_container_foreach (GTK_CONTAINER (widget),
(GtkCallback) gtk_widget_show_all,
NULL);
gtk_widget_show (widget);
}
typedef struct {
GtkWidget *child;
int window_depth;
} ChildOrderInfo;
static void
gtk_container_draw_forall (GtkWidget *widget,
gpointer client_data)
{
struct {
GtkContainer *container;
GArray *child_infos;
cairo_t *cr;
} *data = client_data;
ChildOrderInfo info;
GList *siblings;
GdkWindow *window;
if (gtk_container_should_propagate_draw (data->container, widget, data->cr))
{
info.child = widget;
info.window_depth = G_MAXINT;
if (gtk_widget_get_has_window (widget))
{
window = gtk_widget_get_window (widget);
siblings = gdk_window_peek_children (gdk_window_get_parent (window));
info.window_depth = g_list_index (siblings, window);
}
g_array_append_val (data->child_infos, info);
}
}
static gint
compare_children_for_draw (gconstpointer _a,
gconstpointer _b)
{
const ChildOrderInfo *a = _a;
const ChildOrderInfo *b = _b;
return b->window_depth - a->window_depth;
}
static gint
gtk_container_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkContainer *container = GTK_CONTAINER (widget);
GArray *child_infos;
int i;
ChildOrderInfo *child_info;
struct {
GtkContainer *container;
GArray *child_infos;
cairo_t *cr;
} data;
child_infos = g_array_new (FALSE, TRUE, sizeof (ChildOrderInfo));
data.container = container;
data.cr = cr;
data.child_infos = child_infos;
gtk_container_forall (container,
gtk_container_draw_forall,
&data);
g_array_sort (child_infos, compare_children_for_draw);
for (i = 0; i < child_infos->len; i++)
{
child_info = &g_array_index (child_infos, ChildOrderInfo, i);
gtk_container_propagate_draw (container,
child_info->child, cr);
}
g_array_free (child_infos, TRUE);
return FALSE;
}
static void
gtk_container_map_child (GtkWidget *child,
gpointer client_data)
{
if (gtk_widget_get_visible (child) &&
gtk_widget_get_child_visible (child) &&
!gtk_widget_get_mapped (child))
gtk_widget_map (child);
}
static void
gtk_container_map (GtkWidget *widget)
{
gtk_widget_set_mapped (widget, TRUE);
gtk_container_forall (GTK_CONTAINER (widget),
gtk_container_map_child,
NULL);
if (gtk_widget_get_has_window (widget))
gdk_window_show (gtk_widget_get_window (widget));
}
static void
gtk_container_unmap (GtkWidget *widget)
{
gtk_widget_set_mapped (widget, FALSE);
/* hide our window first so user doesn't see all the child windows
* vanishing one by one. (only matters these days if one of the
* children has an actual native window instead of client-side
* window, e.g. a GtkSocket would)
*/
if (gtk_widget_get_has_window (widget))
gdk_window_hide (gtk_widget_get_window (widget));
gtk_container_forall (GTK_CONTAINER (widget),
(GtkCallback)gtk_widget_unmap,
NULL);
}
static gboolean
gtk_container_should_propagate_draw (GtkContainer *container,
GtkWidget *child,
cairo_t *cr)
{
GdkEventExpose *event;
GdkWindow *event_window, *child_in_window;
if (!gtk_widget_is_drawable (child))
return FALSE;
/* Only propagate to native child window if we're not handling
an expose (i.e. in a pure gtk_widget_draw() call */
event = _gtk_cairo_get_event (cr);
if (event &&
(gtk_widget_get_has_window (child) &&
gdk_window_has_native (gtk_widget_get_window (child))))
return FALSE;
/* Never propagate to a child window when exposing a window
that is not the one the child widget is in. */
event_window = _gtk_cairo_get_event_window (cr);
if (gtk_widget_get_has_window (child))
child_in_window = gdk_window_get_parent (gtk_widget_get_window (child));
else
child_in_window = gtk_widget_get_window (child);
if (event_window != NULL && child_in_window != event_window)
return FALSE;
return TRUE;
}
/**
* gtk_container_propagate_draw:
* @container: a #GtkContainer
* @child: a child of @container
* @cr: Cairo context as passed to the container. If you want to use @cr
* in container’s draw function, consider using cairo_save() and
* cairo_restore() before calling this function.
*
* When a container receives a call to the draw function, it must send
* synthetic #GtkWidget::draw calls to all children that don’t have their
* own #GdkWindows. This function provides a convenient way of doing this.
* A container, when it receives a call to its #GtkWidget::draw function,
* calls gtk_container_propagate_draw() once for each child, passing in
* the @cr the container received.
*
* gtk_container_propagate_draw() takes care of translating the origin of @cr,
* and deciding whether the draw needs to be sent to the child. It is a
* convenient and optimized way of getting the same effect as calling
* gtk_widget_draw() on the child directly.
*
* In most cases, a container can simply either inherit the
* #GtkWidget::draw implementation from #GtkContainer, or do some drawing
* and then chain to the ::draw implementation from #GtkContainer.
**/
void
gtk_container_propagate_draw (GtkContainer *container,
GtkWidget *child,
cairo_t *cr)
{
GtkAllocation allocation;
GdkWindow *window, *w;
int x, y;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (cr != NULL);
g_assert (gtk_widget_get_parent (child) == GTK_WIDGET (container));
if (!gtk_container_should_propagate_draw (container, child, cr))
return;
cairo_save (cr);
/* translate coordinates. Ugly business, that. */
if (!gtk_widget_get_has_window (GTK_WIDGET (container)))
{
gtk_widget_get_allocation (GTK_WIDGET (container), &allocation);
x = -allocation.x;
y = -allocation.y;
}
else
{
x = 0;
y = 0;
}
window = gtk_widget_get_window (GTK_WIDGET (container));
for (w = gtk_widget_get_window (child); w && w != window; w = gdk_window_get_parent (w))
{
int wx, wy;
gdk_window_get_position (w, &wx, &wy);
x += wx;
y += wy;
}
if (w == NULL)
{
x = 0;
y = 0;
}
if (!gtk_widget_get_has_window (child))
{
gtk_widget_get_allocation (child, &allocation);
x += allocation.x;
y += allocation.y;
}
cairo_translate (cr, x, y);
_gtk_widget_draw (child, cr);
cairo_restore (cr);
}
gboolean
_gtk_container_get_reallocate_redraws (GtkContainer *container)
{
return container->priv->reallocate_redraws;
}
/**
* 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;
}
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