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gtk2/gtk/gtkcontainer.c
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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"
#include "a11y/gtkcontaineraccessibleprivate.h"
#include "gtkpopovermenu.h"
#include "gtkshortcutswindow.h"
/* A handful of containers inside GTK+ are cheating and widgets
* inside internal structure as direct children for the purpose
* of forall().
*/
#define SPECIAL_CONTAINER(x) (GTK_IS_ASSISTANT (x) || \
GTK_IS_ACTION_BAR (x) || \
GTK_IS_POPOVER_MENU (x) || \
GTK_IS_SHORTCUTS_SECTION (x) || \
GTK_IS_SHORTCUTS_WINDOW (x))
/**
* SECTION:gtkcontainer
* @Short_description: Base class for widgets which contain other widgets
* @Title: GtkContainer
*
* A GTK+ user interface is constructed by nesting widgets inside widgets.
* Container widgets are the inner nodes in the resulting tree of widgets:
* they contain other widgets. So, for example, you might have a #GtkWindow
* containing a #GtkFrame containing a #GtkLabel. If you wanted an image instead
* of a textual label inside the frame, you might replace the #GtkLabel widget
* with a #GtkImage widget.
*
* There are two major kinds of container widgets in GTK+. Both are subclasses
* of the abstract GtkContainer base class.
*
* The first type of container widget has a single child widget and derives
* from #GtkBin. These containers are decorators, which
* add some kind of functionality to the child. For example, a #GtkButton makes
* its child into a clickable button; a #GtkFrame draws a frame around its child
* and a #GtkWindow places its child widget inside a top-level window.
*
* The second type of container can have more than one child; its purpose is to
* manage layout. This means that these containers assign
* sizes and positions to their children. For example, a horizontal #GtkBox arranges its
* children in a horizontal row, and a #GtkGrid arranges the widgets it contains
* in a two-dimensional grid.
*
* For implementations of #GtkContainer the virtual method #GtkContainerClass.forall()
* is always required, since it's used for drawing and other internal operations
* on the children.
* If the #GtkContainer implementation expect to have non internal children
* it's needed to implement both #GtkContainerClass.add() and #GtkContainerClass.remove().
* If the GtkContainer implementation has internal children, they should be added
* with gtk_widget_set_parent() on init() and removed with gtk_widget_unparent()
* in the #GtkWidgetClass.destroy() implementation.
* See more about implementing custom widgets at https://wiki.gnome.org/HowDoI/CustomWidgets
*
* # 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.
*
* Since 2.16, child properties can also be marked as translatable using
* the same “translatable”, “comments” and “context” attributes that are used
* for regular properties.
*
* Since 3.16, containers can have a <focus-chain> element containing multiple
* <widget> elements, one for each child that should be added to the focus
* chain. The ”name” attribute gives the id of the widget.
*
* An example of these properties in UI definitions:
* |[
* <object class="GtkBox">
* <child>
* <object class="GtkEntry" id="entry1"/>
* <packing>
* <property name="pack-type">start</property>
* </packing>
* </child>
* <child>
* <object class="GtkEntry" id="entry2"/>
* </child>
* <focus-chain>
* <widget name="entry1"/>
* <widget name="entry2"/>
* </focus-chain>
* </object>
* ]|
*
*/
struct _GtkContainerPrivate
{
GtkWidget *focus_child;
GdkFrameClock *resize_clock;
guint resize_handler;
guint border_width : 16;
guint border_width_set : 1;
guint has_focus_chain : 1;
guint reallocate_redraws : 1;
guint restyle_pending : 1;
guint resize_mode : 2;
guint resize_mode_set : 1;
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,
LAST_PROP
};
static GParamSpec *container_props[LAST_PROP];
#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 void gtk_container_buildable_custom_finished (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 GQuark vadjustment_key_id;
static GQuark hadjustment_key_id;
static GQuark quark_focus_chain;
static guint container_signals[LAST_SIGNAL] = { 0 };
static gint GtkContainer_private_offset;
static GtkWidgetClass *parent_class = NULL;
extern GParamSpecPool *_gtk_widget_child_property_pool;
extern GObjectNotifyContext *_gtk_widget_child_property_notify_context;
static GtkBuildableIface *parent_buildable_iface;
/* --- functions --- */
static inline gpointer
gtk_container_get_instance_private (GtkContainer *self)
{
return G_STRUCT_MEMBER_P (self, GtkContainer_private_offset);
}
GType
gtk_container_get_type (void)
{
static GType container_type = 0;
if (!container_type)
{
const GTypeInfo container_info =
{
sizeof (GtkContainerClass),
(GBaseInitFunc) gtk_container_base_class_init,
(GBaseFinalizeFunc) gtk_container_base_class_finalize,
(GClassInitFunc) gtk_container_class_init,
NULL /* class_finalize */,
NULL /* class_data */,
sizeof (GtkContainer),
0 /* n_preallocs */,
(GInstanceInitFunc) gtk_container_init,
NULL, /* value_table */
};
const GInterfaceInfo buildable_info =
{
(GInterfaceInitFunc) gtk_container_buildable_init,
NULL,
NULL
};
container_type =
g_type_register_static (GTK_TYPE_WIDGET, I_("GtkContainer"),
&container_info, G_TYPE_FLAG_ABSTRACT);
GtkContainer_private_offset =
g_type_add_instance_private (container_type, sizeof (GtkContainerPrivate));
g_type_add_interface_static (container_type,
GTK_TYPE_BUILDABLE,
&buildable_info);
}
return container_type;
}
static void
gtk_container_base_class_init (GtkContainerClass *class)
{
/* reset instance specifc class fields that don't get inherited */
class->set_child_property = NULL;
class->get_child_property = NULL;
}
static void
gtk_container_base_class_finalize (GtkContainerClass *class)
{
GList *list, *node;
list = g_param_spec_pool_list_owned (_gtk_widget_child_property_pool, G_OBJECT_CLASS_TYPE (class));
for (node = list; node; node = node->next)
{
GParamSpec *pspec = node->data;
g_param_spec_pool_remove (_gtk_widget_child_property_pool, pspec);
PARAM_SPEC_SET_PARAM_ID (pspec, 0);
g_param_spec_unref (pspec);
}
g_list_free (list);
}
static void
gtk_container_class_init (GtkContainerClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
parent_class = g_type_class_peek_parent (class);
vadjustment_key_id = g_quark_from_static_string ("gtk-vadjustment");
hadjustment_key_id = g_quark_from_static_string ("gtk-hadjustment");
quark_focus_chain = g_quark_from_static_string ("gtk-container-focus-chain");
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;
container_props[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_PARAM_EXPLICIT_NOTIFY|G_PARAM_DEPRECATED);
container_props[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_PARAM_EXPLICIT_NOTIFY);
container_props[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);
g_object_class_install_properties (gobject_class, LAST_PROP, container_props);
container_signals[ADD] =
g_signal_new (I_("add"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkContainerClass, add),
NULL, NULL,
NULL,
G_TYPE_NONE, 1,
GTK_TYPE_WIDGET);
container_signals[REMOVE] =
g_signal_new (I_("remove"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkContainerClass, remove),
NULL, NULL,
NULL,
G_TYPE_NONE, 1,
GTK_TYPE_WIDGET);
container_signals[CHECK_RESIZE] =
g_signal_new (I_("check-resize"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkContainerClass, check_resize),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
container_signals[SET_FOCUS_CHILD] =
g_signal_new (I_("set-focus-child"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkContainerClass, set_focus_child),
NULL, NULL,
NULL,
G_TYPE_NONE, 1,
GTK_TYPE_WIDGET);
if (GtkContainer_private_offset != 0)
g_type_class_adjust_private_offset (class, &GtkContainer_private_offset);
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_CONTAINER_ACCESSIBLE);
}
static void
gtk_container_buildable_init (GtkBuildableIface *iface)
{
parent_buildable_iface = g_type_interface_peek_parent (iface);
iface->add_child = gtk_container_buildable_add_child;
iface->custom_tag_start = gtk_container_buildable_custom_tag_start;
iface->custom_tag_end = gtk_container_buildable_custom_tag_end;
iface->custom_finished = gtk_container_buildable_custom_finished;
}
static void
gtk_container_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *type)
{
if (type)
{
GTK_BUILDER_WARN_INVALID_CHILD_TYPE (buildable, type);
}
else if (GTK_IS_WIDGET (child) &&
_gtk_widget_get_parent (GTK_WIDGET (child)) == NULL)
{
gtk_container_add (GTK_CONTAINER (buildable), GTK_WIDGET (child));
}
else
g_warning ("Cannot add an object of type %s to a container of type %s",
g_type_name (G_OBJECT_TYPE (child)), g_type_name (G_OBJECT_TYPE (buildable)));
}
static inline void
container_set_child_property (GtkContainer *container,
GtkWidget *child,
GParamSpec *pspec,
const GValue *value,
GObjectNotifyQueue *nqueue)
{
GValue tmp_value = G_VALUE_INIT;
GtkContainerClass *class = g_type_class_peek (pspec->owner_type);
/* provide a copy to work from, convert (if necessary) and validate */
g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
if (!g_value_transform (value, &tmp_value))
g_warning ("unable to set child property '%s' of type '%s' from value of type '%s'",
pspec->name,
g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
G_VALUE_TYPE_NAME (value));
else if (g_param_value_validate (pspec, &tmp_value) && !(pspec->flags & G_PARAM_LAX_VALIDATION))
{
gchar *contents = g_strdup_value_contents (value);
g_warning ("value \"%s\" of type '%s' is invalid for property '%s' of type '%s'",
contents,
G_VALUE_TYPE_NAME (value),
pspec->name,
g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
g_free (contents);
}
else
{
class->set_child_property (container, child, PARAM_SPEC_PARAM_ID (pspec), &tmp_value, pspec);
g_object_notify_queue_add (G_OBJECT (child), nqueue, pspec);
}
g_value_unset (&tmp_value);
}
static void
gtk_container_buildable_set_child_property (GtkContainer *container,
GtkBuilder *builder,
GtkWidget *child,
gchar *name,
const gchar *value)
{
GParamSpec *pspec;
GValue gvalue = G_VALUE_INIT;
GError *error = NULL;
GObjectNotifyQueue *nqueue;
if (_gtk_widget_get_parent (child) != (GtkWidget *)container &&
!SPECIAL_CONTAINER (container))
{
/* This can happen with internal children of complex widgets.
* Silently ignore the child properties in this case. We explicitly
* allow it for GtkAssistant, since that is how it works.
*/
return;
}
pspec = gtk_container_class_find_child_property (G_OBJECT_GET_CLASS (container), name);
if (!pspec)
{
g_warning ("%s does not have a child property called %s",
G_OBJECT_TYPE_NAME (container), name);
return;
}
else if (!(pspec->flags & G_PARAM_WRITABLE))
{
g_warning ("Child property '%s' of container class '%s' is not writable",
name, G_OBJECT_TYPE_NAME (container));
return;
}
if (!gtk_builder_value_from_string (builder, pspec, value, &gvalue, &error))
{
g_warning ("Could not read property %s:%s with value %s of type %s: %s",
g_type_name (G_OBJECT_TYPE (container)),
name,
value,
g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
error->message);
g_error_free (error);
return;
}
g_object_ref (container);
g_object_ref (child);
nqueue = g_object_notify_queue_freeze (G_OBJECT (child), _gtk_widget_child_property_notify_context);
container_set_child_property (container, child, pspec, &gvalue, nqueue);
g_object_notify_queue_thaw (G_OBJECT (child), nqueue);
g_object_unref (container);
g_object_unref (child);
g_value_unset (&gvalue);
}
typedef struct {
GtkBuilder *builder;
GtkContainer *container;
GtkWidget *child;
GString *string;
gchar *child_prop_name;
gchar *context;
gboolean translatable;
} PackingData;
static void
packing_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **names,
const gchar **values,
gpointer user_data,
GError **error)
{
PackingData *data = (PackingData*)user_data;
if (strcmp (element_name, "property") == 0)
{
const gchar *name;
gboolean translatable = FALSE;
const gchar *ctx = NULL;
if (!_gtk_builder_check_parent (data->builder, context, "packing", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_STRING, "name", &name,
G_MARKUP_COLLECT_BOOLEAN|G_MARKUP_COLLECT_OPTIONAL, "translatable", &translatable,
G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "comments", NULL,
G_MARKUP_COLLECT_STRING|G_MARKUP_COLLECT_OPTIONAL, "context", &ctx,
G_MARKUP_COLLECT_INVALID))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
data->child_prop_name = g_strdup (name);
data->translatable = translatable;
data->context = g_strdup (ctx);
}
else if (strcmp (element_name, "packing") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "child", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_INVALID, NULL, NULL,
G_MARKUP_COLLECT_INVALID))
_gtk_builder_prefix_error (data->builder, context, error);
}
else
{
_gtk_builder_error_unhandled_tag (data->builder, context,
"GtkContainer", element_name,
error);
}
}
static void
packing_text_element (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
PackingData *data = (PackingData*)user_data;
if (data->child_prop_name)
g_string_append_len (data->string, text, text_len);
}
static void
packing_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
PackingData *data = (PackingData*)user_data;
/* translate the string */
if (data->string->len && data->translatable)
{
const gchar *translated;
const gchar *domain;
domain = gtk_builder_get_translation_domain (data->builder);
translated = _gtk_builder_parser_translate (domain,
data->context,
data->string->str);
g_string_assign (data->string, translated);
}
if (data->child_prop_name)
gtk_container_buildable_set_child_property (data->container,
data->builder,
data->child,
data->child_prop_name,
data->string->str);
g_string_set_size (data->string, 0);
g_clear_pointer (&data->child_prop_name, g_free);
g_clear_pointer (&data->context, g_free);
data->translatable = FALSE;
}
static const GMarkupParser packing_parser =
{
packing_start_element,
packing_end_element,
packing_text_element,
};
typedef struct
{
gchar *name;
gint line;
gint col;
} FocusChainWidget;
static void
focus_chain_widget_free (gpointer data)
{
FocusChainWidget *fcw = data;
g_free (fcw->name);
g_free (fcw);
}
typedef struct
{
GSList *items;
GObject *object;
GtkBuilder *builder;
gint line;
gint col;
} FocusChainData;
static void
focus_chain_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **names,
const gchar **values,
gpointer user_data,
GError **error)
{
FocusChainData *data = (FocusChainData*)user_data;
if (strcmp (element_name, "widget") == 0)
{
const gchar *name;
FocusChainWidget *fcw;
if (!_gtk_builder_check_parent (data->builder, context, "focus-chain", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_STRING, "name", &name,
G_MARKUP_COLLECT_INVALID))
{
_gtk_builder_prefix_error (data->builder, context, error);
return;
}
fcw = g_new (FocusChainWidget, 1);
fcw->name = g_strdup (name);
g_markup_parse_context_get_position (context, &fcw->line, &fcw->col);
data->items = g_slist_prepend (data->items, fcw);
}
else if (strcmp (element_name, "focus-chain") == 0)
{
if (!_gtk_builder_check_parent (data->builder, context, "object", error))
return;
if (!g_markup_collect_attributes (element_name, names, values, error,
G_MARKUP_COLLECT_INVALID, "", NULL,
G_MARKUP_COLLECT_INVALID))
_gtk_builder_prefix_error (data->builder, context, error);
}
else
{
_gtk_builder_error_unhandled_tag (data->builder, context,
"GtkContainer", element_name,
error);
}
}
static const GMarkupParser focus_chain_parser =
{
focus_chain_start_element
};
static gboolean
gtk_container_buildable_custom_tag_start (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
GMarkupParser *parser,
gpointer *parser_data)
{
if (parent_buildable_iface->custom_tag_start (buildable, builder, child,
tagname, parser, parser_data))
return TRUE;
if (child && strcmp (tagname, "packing") == 0)
{
PackingData *data;
data = g_slice_new0 (PackingData);
data->string = g_string_new ("");
data->builder = builder;
data->container = GTK_CONTAINER (buildable);
data->child = GTK_WIDGET (child);
data->child_prop_name = NULL;
*parser = packing_parser;
*parser_data = data;
return TRUE;
}
else if (!child && strcmp (tagname, "focus-chain") == 0)
{
FocusChainData *data;
data = g_slice_new0 (FocusChainData);
data->items = NULL;
data->object = G_OBJECT (buildable);
data->builder = builder;
*parser = focus_chain_parser;
*parser_data = data;
return TRUE;
}
return FALSE;
}
static void
gtk_container_buildable_custom_tag_end (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
gpointer *parser_data)
{
if (strcmp (tagname, "packing") == 0)
{
PackingData *data = (PackingData*)parser_data;
g_string_free (data->string, TRUE);
g_slice_free (PackingData, data);
return;
}
if (parent_buildable_iface->custom_tag_end)
parent_buildable_iface->custom_tag_end (buildable, builder,
child, tagname, parser_data);
}
static void
gtk_container_buildable_custom_finished (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *tagname,
gpointer parser_data)
{
if (strcmp (tagname, "focus-chain") == 0)
{
FocusChainData *data = (FocusChainData*)parser_data;
FocusChainWidget *fcw;
GSList *l;
GList *chain;
GObject *object;
chain = NULL;
for (l = data->items; l; l = l->next)
{
fcw = l->data;
object = _gtk_builder_lookup_object (builder, fcw->name, fcw->line, fcw->col);
if (!object)
continue;
chain = g_list_prepend (chain, object);
}
gtk_container_set_focus_chain (GTK_CONTAINER (data->object), chain);
g_list_free (chain);
g_slist_free_full (data->items, focus_chain_widget_free);
g_slice_free (FocusChainData, data);
return;
}
if (parent_buildable_iface->custom_finished)
parent_buildable_iface->custom_finished (buildable, builder,
child, tagname, parser_data);
}
/**
* gtk_container_child_type:
* @container: a #GtkContainer
*
* Returns the type of the children supported by the container.
*
* Note that this may return %G_TYPE_NONE to indicate that no more
* children can be added, e.g. for a #GtkPaned which already has two
* children.
*
* Returns: a #GType.
**/
GType
gtk_container_child_type (GtkContainer *container)
{
GType slot;
GtkContainerClass *class;
g_return_val_if_fail (GTK_IS_CONTAINER (container), 0);
class = GTK_CONTAINER_GET_CLASS (container);
if (class->child_type)
slot = class->child_type (container);
else
slot = G_TYPE_NONE;
return slot;
}
/* --- GtkContainer child property mechanism --- */
/**
* gtk_container_child_notify:
* @container: the #GtkContainer
* @child: the child widget
* @child_property: the name of a child property installed on
* the class of @container
*
* Emits a #GtkWidget::child-notify signal for the
* [child property][child-properties]
* @child_property on the child.
*
* This is an analogue of g_object_notify() for child properties.
*
* Also see gtk_widget_child_notify().
*
* 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);
}
/**
* gtk_container_child_notify_by_pspec:
* @container: the #GtkContainer
* @child: the child widget
* @pspec: the #GParamSpec of a child property instealled on
* the class of @container
*
* Emits a #GtkWidget::child-notify signal for the
* [child property][child-properties] specified by
* @pspec on the child.
*
* This is an analogue of g_object_notify_by_pspec() for child properties.
*
* Since: 3.18
*/
void
gtk_container_child_notify_by_pspec (GtkContainer *container,
GtkWidget *child,
GParamSpec *pspec)
{
GObject *obj = G_OBJECT (child);
GObjectNotifyQueue *nqueue;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
if (obj->ref_count == 0)
return;
g_object_ref (obj);
nqueue = g_object_notify_queue_freeze (obj, _gtk_widget_child_property_notify_context);
g_object_notify_queue_add (obj, nqueue, pspec);
g_object_notify_queue_thaw (obj, nqueue);
g_object_unref (obj);
}
static inline void
container_get_child_property (GtkContainer *container,
GtkWidget *child,
GParamSpec *pspec,
GValue *value)
{
GtkContainerClass *class = g_type_class_peek (pspec->owner_type);
class->get_child_property (container, child, PARAM_SPEC_PARAM_ID (pspec), value, pspec);
}
/**
* gtk_container_child_get_valist:
* @container: a #GtkContainer
* @child: a widget which is a child of @container
* @first_property_name: the name of the first property to get
* @var_args: return location for the first property, followed
* optionally by more name/return location pairs, followed by %NULL
*
* Gets the values of one or more child properties for @child and @container.
**/
void
gtk_container_child_get_valist (GtkContainer *container,
GtkWidget *child,
const gchar *first_property_name,
va_list var_args)
{
const gchar *name;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (GTK_IS_WIDGET (child));
g_object_ref (container);
g_object_ref (child);
name = first_property_name;
while (name)
{
GValue value = G_VALUE_INIT;
GParamSpec *pspec;
gchar *error;
pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool,
name,
G_OBJECT_TYPE (container),
TRUE);
if (!pspec)
{
g_warning ("%s: container class '%s' has no child property named '%s'",
G_STRLOC,
G_OBJECT_TYPE_NAME (container),
name);
break;
}
if (!(pspec->flags & G_PARAM_READABLE))
{
g_warning ("%s: child property '%s' of container class '%s' is not readable",
G_STRLOC,
pspec->name,
G_OBJECT_TYPE_NAME (container));
break;
}
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
container_get_child_property (container, child, pspec, &value);
G_VALUE_LCOPY (&value, var_args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
g_value_unset (&value);
break;
}
g_value_unset (&value);
name = va_arg (var_args, gchar*);
}
g_object_unref (child);
g_object_unref (container);
}
/**
* gtk_container_child_get_property:
* @container: a #GtkContainer
* @child: a widget which is a child of @container
* @property_name: the name of the property to get
* @value: a location to return the value
*
* Gets the value of a child property for @child and @container.
**/
void
gtk_container_child_get_property (GtkContainer *container,
GtkWidget *child,
const gchar *property_name,
GValue *value)
{
GParamSpec *pspec;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (property_name != NULL);
g_return_if_fail (G_IS_VALUE (value));
g_object_ref (container);
g_object_ref (child);
pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, property_name,
G_OBJECT_TYPE (container), TRUE);
if (!pspec)
g_warning ("%s: container class '%s' has no child property named '%s'",
G_STRLOC,
G_OBJECT_TYPE_NAME (container),
property_name);
else if (!(pspec->flags & G_PARAM_READABLE))
g_warning ("%s: child property '%s' of container class '%s' is not readable",
G_STRLOC,
pspec->name,
G_OBJECT_TYPE_NAME (container));
else
{
GValue *prop_value, tmp_value = G_VALUE_INIT;
/* auto-conversion of the callers value type
*/
if (G_VALUE_TYPE (value) == G_PARAM_SPEC_VALUE_TYPE (pspec))
{
g_value_reset (value);
prop_value = value;
}
else if (!g_value_type_transformable (G_PARAM_SPEC_VALUE_TYPE (pspec), G_VALUE_TYPE (value)))
{
g_warning ("can't retrieve child property '%s' of type '%s' as value of type '%s'",
pspec->name,
g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
G_VALUE_TYPE_NAME (value));
g_object_unref (child);
g_object_unref (container);
return;
}
else
{
g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
prop_value = &tmp_value;
}
container_get_child_property (container, child, pspec, prop_value);
if (prop_value != value)
{
g_value_transform (prop_value, value);
g_value_unset (&tmp_value);
}
}
g_object_unref (child);
g_object_unref (container);
}
/**
* gtk_container_child_set_valist:
* @container: a #GtkContainer
* @child: a widget which is a child of @container
* @first_property_name: the name of the first property to set
* @var_args: a %NULL-terminated list of property names and values, starting
* with @first_prop_name
*
* Sets one or more child properties for @child and @container.
**/
void
gtk_container_child_set_valist (GtkContainer *container,
GtkWidget *child,
const gchar *first_property_name,
va_list var_args)
{
GObjectNotifyQueue *nqueue;
const gchar *name;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (GTK_IS_WIDGET (child));
g_object_ref (container);
g_object_ref (child);
nqueue = g_object_notify_queue_freeze (G_OBJECT (child), _gtk_widget_child_property_notify_context);
name = first_property_name;
while (name)
{
GValue value = G_VALUE_INIT;
gchar *error = NULL;
GParamSpec *pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool,
name,
G_OBJECT_TYPE (container),
TRUE);
if (!pspec)
{
g_warning ("%s: container class '%s' has no child property named '%s'",
G_STRLOC,
G_OBJECT_TYPE_NAME (container),
name);
break;
}
if (!(pspec->flags & G_PARAM_WRITABLE))
{
g_warning ("%s: child property '%s' of container class '%s' is not writable",
G_STRLOC,
pspec->name,
G_OBJECT_TYPE_NAME (container));
break;
}
G_VALUE_COLLECT_INIT (&value, G_PARAM_SPEC_VALUE_TYPE (pspec),
var_args, 0, &error);
if (error)
{
g_warning ("%s: %s", G_STRLOC, error);
g_free (error);
/* we purposely leak the value here, it might not be
* in a sane state if an error condition occoured
*/
break;
}
container_set_child_property (container, child, pspec, &value, nqueue);
g_value_unset (&value);
name = va_arg (var_args, gchar*);
}
g_object_notify_queue_thaw (G_OBJECT (child), nqueue);
g_object_unref (container);
g_object_unref (child);
}
/**
* gtk_container_child_set_property:
* @container: a #GtkContainer
* @child: a widget which is a child of @container
* @property_name: the name of the property to set
* @value: the value to set the property to
*
* Sets a child property for @child and @container.
**/
void
gtk_container_child_set_property (GtkContainer *container,
GtkWidget *child,
const gchar *property_name,
const GValue *value)
{
GObjectNotifyQueue *nqueue;
GParamSpec *pspec;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (property_name != NULL);
g_return_if_fail (G_IS_VALUE (value));
g_object_ref (container);
g_object_ref (child);
nqueue = g_object_notify_queue_freeze (G_OBJECT (child), _gtk_widget_child_property_notify_context);
pspec = g_param_spec_pool_lookup (_gtk_widget_child_property_pool, property_name,
G_OBJECT_TYPE (container), TRUE);
if (!pspec)
g_warning ("%s: container class '%s' has no child property named '%s'",
G_STRLOC,
G_OBJECT_TYPE_NAME (container),
property_name);
else if (!(pspec->flags & G_PARAM_WRITABLE))
g_warning ("%s: child property '%s' of container class '%s' is not writable",
G_STRLOC,
pspec->name,
G_OBJECT_TYPE_NAME (container));
else
{
container_set_child_property (container, child, pspec, value, nqueue);
}
g_object_notify_queue_thaw (G_OBJECT (child), nqueue);
g_object_unref (container);
g_object_unref (child);
}
/**
* gtk_container_add_with_properties:
* @container: a #GtkContainer
* @widget: a widget to be placed inside @container
* @first_prop_name: the name of the first child property to set
* @...: a %NULL-terminated list of property names and values, starting
* with @first_prop_name
*
* Adds @widget to @container, setting child properties at the same time.
* See gtk_container_add() and gtk_container_child_set() for more details.
*/
void
gtk_container_add_with_properties (GtkContainer *container,
GtkWidget *widget,
const gchar *first_prop_name,
...)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (_gtk_widget_get_parent (widget) == NULL);
g_object_ref (container);
g_object_ref (widget);
gtk_widget_freeze_child_notify (widget);
g_signal_emit (container, container_signals[ADD], 0, widget);
if (_gtk_widget_get_parent (widget))
{
va_list var_args;
va_start (var_args, first_prop_name);
gtk_container_child_set_valist (container, widget, first_prop_name, var_args);
va_end (var_args);
}
gtk_widget_thaw_child_notify (widget);
g_object_unref (widget);
g_object_unref (container);
}
/**
* gtk_container_child_set:
* @container: a #GtkContainer
* @child: a widget which is a child of @container
* @first_prop_name: the name of the first property to set
* @...: a %NULL-terminated list of property names and values, starting
* with @first_prop_name
*
* Sets one or more child properties for @child and @container.
*/
void
gtk_container_child_set (GtkContainer *container,
GtkWidget *child,
const gchar *first_prop_name,
...)
{
va_list var_args;
va_start (var_args, first_prop_name);
gtk_container_child_set_valist (container, child, first_prop_name, var_args);
va_end (var_args);
}
/**
* gtk_container_child_get:
* @container: a #GtkContainer
* @child: a widget which is a child of @container
* @first_prop_name: the name of the first property to get
* @...: return location for the first property, followed
* optionally by more name/return location pairs, followed by %NULL
*
* Gets the values of one or more child properties for @child and @container.
*/
void
gtk_container_child_get (GtkContainer *container,
GtkWidget *child,
const gchar *first_prop_name,
...)
{
va_list var_args;
va_start (var_args, first_prop_name);
gtk_container_child_get_valist (container, child, first_prop_name, var_args);
va_end (var_args);
}
static inline void
install_child_property_internal (GType g_type,
guint property_id,
GParamSpec *pspec)
{
if (g_param_spec_pool_lookup (_gtk_widget_child_property_pool, pspec->name, g_type, FALSE))
{
g_warning ("Class '%s' already contains a child property named '%s'",
g_type_name (g_type),
pspec->name);
return;
}
g_param_spec_ref (pspec);
g_param_spec_sink (pspec);
PARAM_SPEC_SET_PARAM_ID (pspec, property_id);
g_param_spec_pool_insert (_gtk_widget_child_property_pool, pspec, g_type);
}
/**
* gtk_container_class_install_child_property:
* @cclass: a #GtkContainerClass
* @property_id: the id for the property
* @pspec: the #GParamSpec for the property
*
* Installs a child property on a container class.
**/
void
gtk_container_class_install_child_property (GtkContainerClass *cclass,
guint property_id,
GParamSpec *pspec)
{
g_return_if_fail (GTK_IS_CONTAINER_CLASS (cclass));
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
if (pspec->flags & G_PARAM_WRITABLE)
g_return_if_fail (cclass->set_child_property != NULL);
if (pspec->flags & G_PARAM_READABLE)
g_return_if_fail (cclass->get_child_property != NULL);
g_return_if_fail (property_id > 0);
g_return_if_fail (PARAM_SPEC_PARAM_ID (pspec) == 0); /* paranoid */
if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
g_return_if_fail ((pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) == 0);
install_child_property_internal (G_OBJECT_CLASS_TYPE (cclass), property_id, pspec);
}
/**
* gtk_container_class_install_child_properties:
* @cclass: a #GtkContainerClass
* @n_pspecs: the length of the #GParamSpec array
* @pspecs: (array length=n_pspecs): the #GParamSpec array defining the new
* child properties
*
* Installs child properties on a container class.
*
* Since: 3.18
*/
void
gtk_container_class_install_child_properties (GtkContainerClass *cclass,
guint n_pspecs,
GParamSpec **pspecs)
{
gint i;
g_return_if_fail (GTK_IS_CONTAINER_CLASS (cclass));
g_return_if_fail (n_pspecs > 1);
g_return_if_fail (pspecs[0] == NULL);
/* we skip the first element of the array as it would have a 0 prop_id */
for (i = 1; i < n_pspecs; i++)
{
GParamSpec *pspec = pspecs[i];
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
if (pspec->flags & G_PARAM_WRITABLE)
g_return_if_fail (cclass->set_child_property != NULL);
if (pspec->flags & G_PARAM_READABLE)
g_return_if_fail (cclass->get_child_property != NULL);
g_return_if_fail (PARAM_SPEC_PARAM_ID (pspec) == 0); /* paranoid */
if (pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY))
g_return_if_fail ((pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) == 0);
install_child_property_internal (G_OBJECT_CLASS_TYPE (cclass), i, pspec);
}
}
/**
* gtk_container_class_find_child_property:
* @cclass: (type GtkContainerClass): a #GtkContainerClass
* @property_name: the name of the child property to find
*
* Finds a child property of a container class by name.
*
* Returns: (nullable) (transfer none): the #GParamSpec of the child
* property or %NULL if @class has no child property with that
* name.
*/
GParamSpec*
gtk_container_class_find_child_property (GObjectClass *cclass,
const gchar *property_name)
{
g_return_val_if_fail (GTK_IS_CONTAINER_CLASS (cclass), NULL);
g_return_val_if_fail (property_name != NULL, NULL);
return g_param_spec_pool_lookup (_gtk_widget_child_property_pool,
property_name,
G_OBJECT_CLASS_TYPE (cclass),
TRUE);
}
/**
* gtk_container_class_list_child_properties:
* @cclass: (type GtkContainerClass): a #GtkContainerClass
* @n_properties: location to return the number of child properties found
*
* Returns all child properties of a container class.
*
* Returns: (array length=n_properties) (transfer container):
* a newly allocated %NULL-terminated array of #GParamSpec*.
* The array must be freed with g_free().
*/
GParamSpec**
gtk_container_class_list_child_properties (GObjectClass *cclass,
guint *n_properties)
{
GParamSpec **pspecs;
guint n;
g_return_val_if_fail (GTK_IS_CONTAINER_CLASS (cclass), NULL);
pspecs = g_param_spec_pool_list (_gtk_widget_child_property_pool,
G_OBJECT_CLASS_TYPE (cclass),
&n);
if (n_properties)
*n_properties = n;
return pspecs;
}
static void
gtk_container_add_unimplemented (GtkContainer *container,
GtkWidget *widget)
{
g_warning ("GtkContainerClass::add not implemented for '%s'", g_type_name (G_TYPE_FROM_INSTANCE (container)));
}
static void
gtk_container_remove_unimplemented (GtkContainer *container,
GtkWidget *widget)
{
g_warning ("GtkContainerClass::remove not implemented for '%s'", g_type_name (G_TYPE_FROM_INSTANCE (container)));
}
static void
gtk_container_init (GtkContainer *container)
{
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;
priv->border_width_set = FALSE;
}
static void
gtk_container_destroy (GtkWidget *widget)
{
GtkContainer *container = GTK_CONTAINER (widget);
GtkContainerPrivate *priv = container->priv;
if (priv->restyle_pending)
priv->restyle_pending = FALSE;
g_clear_object (&priv->focus_child);
/* 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;
}
}
gboolean
_gtk_container_get_border_width_set (GtkContainer *container)
{
GtkContainerPrivate *priv;
g_return_val_if_fail (GTK_IS_CONTAINER (container), FALSE);
priv = container->priv;
return priv->border_width_set;
}
void
_gtk_container_set_border_width_set (GtkContainer *container,
gboolean border_width_set)
{
GtkContainerPrivate *priv;
g_return_if_fail (GTK_IS_CONTAINER (container));
priv = container->priv;
priv->border_width_set = border_width_set ? TRUE : FALSE;
}
/**
* 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, use a specific
* #GtkWidget:margin property on the child widget, for example
* #GtkWidget:margin-top.
**/
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;
_gtk_container_set_border_width_set (container, TRUE);
g_object_notify_by_pspec (G_OBJECT (container), container_props[PROP_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().
*
* Returns: 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 remove the widget from its existing container first." ,
g_type_name (G_OBJECT_TYPE (widget)),
g_type_name (G_OBJECT_TYPE (container)),
g_type_name (G_OBJECT_TYPE (parent)));
return;
}
g_signal_emit (container, container_signals[ADD], 0, widget);
_gtk_container_accessible_add (GTK_WIDGET (container), widget);
}
/**
* gtk_container_remove:
* @container: a #GtkContainer
* @widget: a current child of @container
*
* Removes @widget from @container. @widget must be inside @container.
* Note that @container will own a reference to @widget, and that this
* may be the last reference held; so removing a widget from its
* container can destroy that widget. If you want to use @widget
* again, you need to add a reference to it before removing it from
* a container, using g_object_ref(). If you don’t want to use @widget
* again it’s usually more efficient to simply destroy it directly
* using gtk_widget_destroy() since this will remove it from the
* container and help break any circular reference count cycles.
**/
void
gtk_container_remove (GtkContainer *container,
GtkWidget *widget)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (GTK_IS_WIDGET (widget));
g_object_ref (container);
g_object_ref (widget);
g_signal_emit (container, container_signals[REMOVE], 0, widget);
_gtk_container_accessible_remove (GTK_WIDGET (container), widget);
g_object_unref (widget);
g_object_unref (container);
}
static void
gtk_container_real_set_resize_mode (GtkContainer *container,
GtkResizeMode resize_mode)
{
GtkWidget *widget = GTK_WIDGET (container);
GtkContainerPrivate *priv = container->priv;
if (_gtk_widget_is_toplevel (widget) &&
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 (widget);
g_object_notify_by_pspec (G_OBJECT (container), container_props[PROP_RESIZE_MODE]);
}
}
/**
* 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;
priv->resize_mode_set = TRUE;
gtk_container_real_set_resize_mode (container, resize_mode);
}
void
gtk_container_set_default_resize_mode (GtkContainer *container,
GtkResizeMode resize_mode)
{
GtkContainerPrivate *priv = container->priv;
if (priv->resize_mode_set)
return;
gtk_container_real_set_resize_mode (container, resize_mode);
}
/**
* gtk_container_get_resize_mode:
* @container: a #GtkContainer
*
* Returns the resize mode for the container. See
* gtk_container_set_resize_mode ().
*
* Returns: 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.
*
* Deprecated: 3.14: Call gtk_widget_queue_draw() in your size_allocate handler.
**/
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 gboolean
gtk_container_needs_idle_sizer (GtkContainer *container)
{
GtkContainerPrivate *priv = container->priv;
if (priv->resize_mode == GTK_RESIZE_PARENT)
return FALSE;
if (container->priv->restyle_pending)
return TRUE;
if (priv->resize_mode == GTK_RESIZE_IMMEDIATE)
return FALSE;
return gtk_widget_needs_allocate (GTK_WIDGET (container));
}
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)
{
container->priv->restyle_pending = FALSE;
gtk_css_node_validate (gtk_widget_get_css_node (GTK_WIDGET (container)));
}
/* we may be invoked with a container_resize_queue of NULL, because
* queue_resize could have been adding an extra idle function while
* the queue still got processed. we better just ignore such case
* than trying to explicitly work around them with some extra flags,
* since it doesn't cause any actual harm.
*/
if (gtk_widget_needs_allocate (GTK_WIDGET (container)))
{
gtk_container_check_resize (container);
}
if (!gtk_container_needs_idle_sizer (container))
{
_gtk_container_stop_idle_sizer (container);
}
else
{
gdk_frame_clock_request_phase (clock,
GDK_FRAME_CLOCK_PHASE_LAYOUT);
}
}
static void
gtk_container_start_idle_sizer (GtkContainer *container)
{
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;
}
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 (gtk_widget_needs_allocate (widget))
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;
}
}
}
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;
}
void
_gtk_container_maybe_start_idle_sizer (GtkContainer *container)
{
if (gtk_container_needs_idle_sizer (container))
gtk_container_start_idle_sizer (container);
}
void
gtk_container_check_resize (GtkContainer *container)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
g_signal_emit (container, container_signals[CHECK_RESIZE], 0);
}
static void
gtk_container_real_check_resize (GtkContainer *container)
{
GtkWidget *widget = GTK_WIDGET (container);
GtkAllocation allocation;
GtkRequisition requisition;
int baseline;
if (_gtk_widget_get_alloc_needed (widget))
{
gtk_widget_get_preferred_size (widget, &requisition, NULL);
gtk_widget_get_allocated_size (widget, &allocation, &baseline);
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);
}
else
gtk_widget_queue_resize (widget);
G_GNUC_END_IGNORE_DEPRECATIONS;
}
else
{
gtk_widget_size_allocate_with_baseline (widget, &allocation, baseline);
}
}
else
{
gtk_widget_ensure_allocate (widget);
}
}
/* 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;
gint baseline;
/* 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_allocated_size (widget, &allocation, &baseline);
gtk_widget_size_allocate_with_baseline (widget, &allocation, baseline);
}
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 direct child of @container, including
* children that are considered “internal” (implementation details
* of the container). “Internal” children generally weren’t added
* by the user of the container, but were added by the container
* implementation itself.
*
* Most applications should use gtk_container_foreach(), rather
* than gtk_container_forall().
**/
void
gtk_container_forall (GtkContainer *container,
GtkCallback callback,
gpointer callback_data)
{
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. For all practical purposes, this function
* should iterate over precisely those child widgets that were
* added to the container by the application with explicit add()
* calls.
*
* Most applications should use gtk_container_foreach(),
* rather than gtk_container_forall().
**/
void
gtk_container_foreach (GtkContainer *container,
GtkCallback callback,
gpointer callback_data)
{
GtkContainerClass *class;
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (callback != NULL);
class = GTK_CONTAINER_GET_CLASS (container);
if (class->forall)
class->forall (container, 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 manually set the focus to a specific widget.
*/
void
gtk_container_set_focus_child (GtkContainer *container,
GtkWidget *child)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
if (child)
g_return_if_fail (GTK_IS_WIDGET (child));
g_signal_emit (container, container_signals[SET_FOCUS_CHILD], 0, child);
}
/**
* gtk_container_get_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: (nullable) (transfer none): The child widget which will receive the
* focus inside @container when the @container is focused,
* 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.
*
* Returns: (element-type GtkWidget) (transfer container): a newly-allocated list of the container’s non-internal children.
**/
GList*
gtk_container_get_children (GtkContainer *container)
{
GList *children = NULL;
gtk_container_foreach (container,
gtk_container_children_callback,
&children);
return g_list_reverse (children);
}
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_qdata (G_OBJECT (container), quark_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)
{
GtkWidgetPath *path;
GtkWidget *widget = GTK_WIDGET (container);
path = _gtk_widget_create_path (widget);
gtk_widget_path_append_for_widget (path, child);
return path;
}
static gboolean
gtk_container_focus (GtkWidget *widget,
GtkDirectionType direction)
{
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.
*
* Returns: a copy of @children, sorted in correct focusing order,
* with children that aren’t suitable for focusing in this direction
* removed.
**/
GList *
_gtk_container_focus_sort (GtkContainer *container,
GList *children,
GtkDirectionType direction,
GtkWidget *old_focus)
{
GList *visible_children = NULL;
while (children)
{
if (_gtk_widget_get_realized (children->data))
visible_children = g_list_prepend (visible_children, children->data);
children = children->next;
}
switch (direction)
{
case GTK_DIR_TAB_FORWARD:
case GTK_DIR_TAB_BACKWARD:
return gtk_container_focus_sort_tab (container, visible_children, direction, old_focus);
case GTK_DIR_UP:
case GTK_DIR_DOWN:
return gtk_container_focus_sort_up_down (container, visible_children, direction, old_focus);
case GTK_DIR_LEFT:
case GTK_DIR_RIGHT:
return gtk_container_focus_sort_left_right (container, visible_children, direction, old_focus);
}
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_qdata (G_OBJECT (container), quark_focus_chain);
chain = g_list_remove (chain, widget);
g_signal_handlers_disconnect_by_func (widget,
chain_widget_destroyed,
user_data);
g_object_set_qdata (G_OBJECT (container), quark_focus_chain, chain);
}
/**
* gtk_container_set_focus_chain:
* @container: a #GtkContainer
* @focusable_widgets: (transfer none) (element-type GtkWidget):
* the new focus chain
*
* Sets a focus chain, overriding the one computed automatically by GTK+.
*
* In principle each widget in the chain should be a descendant of the
* container, but this is not enforced by this method, since it’s allowed
* to set the focus chain before you pack the widgets, or have a widget
* in the chain that isn’t always packed. The necessary checks are done
* when the focus chain is actually traversed.
**/
void
gtk_container_set_focus_chain (GtkContainer *container,
GList *focusable_widgets)
{
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 = tmp_list->next;
}
chain = g_list_reverse (chain);
g_object_set_qdata (G_OBJECT (container), quark_focus_chain, chain);
}
/**
* gtk_container_get_focus_chain:
* @container: a #GtkContainer
* @focusable_widgets: (element-type GtkWidget) (out) (transfer container): location
* to store the focus chain of the
* container, or %NULL. You should free this list
* using g_list_free() when you are done with it, however
* no additional reference count is added to the
* individual widgets in the focus chain.
*
* Retrieves the focus chain of the container, if one has been
* set explicitly. If no focus chain has been explicitly
* set, GTK+ computes the focus chain based on the positions
* of the children. In that case, GTK+ stores %NULL in
* @focusable_widgets and returns %FALSE.
*
* Returns: %TRUE if the focus chain of the container
* has been set explicitly.
**/
gboolean
gtk_container_get_focus_chain (GtkContainer *container,
GList **focus_chain)
{
GtkContainerPrivate *priv;
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_qdata (G_OBJECT (container), quark_focus_chain, NULL);
tmp_list = chain;
while (tmp_list != NULL)
{
g_signal_handlers_disconnect_by_func (tmp_list->data,
chain_widget_destroyed,
container);
tmp_list = tmp_list->next;
}
g_list_free (chain);
}
}
/**
* gtk_container_set_focus_vadjustment:
* @container: a #GtkContainer
* @adjustment: an adjustment which should be adjusted when the focus
* is moved among the descendents of @container
*
* Hooks up an adjustment to focus handling in a container, so when a
* child of the container is focused, the adjustment is scrolled to
* show that widget. This function sets the vertical alignment. See
* gtk_scrolled_window_get_vadjustment() for a typical way of obtaining
* the adjustment and gtk_container_set_focus_hadjustment() for setting
* the horizontal adjustment.
*
* The adjustments have to be in pixel units and in the same coordinate
* system as the allocation for immediate children of the container.
*/
void
gtk_container_set_focus_vadjustment (GtkContainer *container,
GtkAdjustment *adjustment)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
if (adjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (adjustment)
g_object_ref (adjustment);
g_object_set_qdata_full (G_OBJECT (container),
vadjustment_key_id,
adjustment,
g_object_unref);
}
/**
* gtk_container_get_focus_vadjustment:
* @container: a #GtkContainer
*
* Retrieves the vertical focus adjustment for the container. See
* gtk_container_set_focus_vadjustment().
*
* Returns: (nullable) (transfer none): the vertical focus adjustment, or
* %NULL if none has been set.
**/
GtkAdjustment *
gtk_container_get_focus_vadjustment (GtkContainer *container)
{
GtkAdjustment *vadjustment;
g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL);
vadjustment = g_object_get_qdata (G_OBJECT (container), vadjustment_key_id);
return vadjustment;
}
/**
* gtk_container_set_focus_hadjustment:
* @container: a #GtkContainer
* @adjustment: an adjustment which should be adjusted when the focus is
* moved among the descendents of @container
*
* Hooks up an adjustment to focus handling in a container, so when a child
* of the container is focused, the adjustment is scrolled to show that
* widget. This function sets the horizontal alignment.
* See gtk_scrolled_window_get_hadjustment() for a typical way of obtaining
* the adjustment and gtk_container_set_focus_vadjustment() for setting
* the vertical adjustment.
*
* The adjustments have to be in pixel units and in the same coordinate
* system as the allocation for immediate children of the container.
*/
void
gtk_container_set_focus_hadjustment (GtkContainer *container,
GtkAdjustment *adjustment)
{
g_return_if_fail (GTK_IS_CONTAINER (container));
if (adjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (adjustment)
g_object_ref (adjustment);
g_object_set_qdata_full (G_OBJECT (container),
hadjustment_key_id,
adjustment,
g_object_unref);
}
/**
* gtk_container_get_focus_hadjustment:
* @container: a #GtkContainer
*
* Retrieves the horizontal focus adjustment for the container. See
* gtk_container_set_focus_hadjustment ().
*
* Returns: (nullable) (transfer none): the horizontal focus adjustment, or %NULL if
* none has been set.
**/
GtkAdjustment *
gtk_container_get_focus_hadjustment (GtkContainer *container)
{
GtkAdjustment *hadjustment;
g_return_val_if_fail (GTK_IS_CONTAINER (container), NULL);
hadjustment = g_object_get_qdata (G_OBJECT (container), hadjustment_key_id);
return hadjustment;
}
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;
window = _gtk_widget_get_window (widget);
if (window != gtk_widget_get_window (GTK_WIDGET (data->container)))
{
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)
{
GdkWindow *child_in_window;
if (!_gtk_widget_is_drawable (child))
return FALSE;
/* Never propagate to a child window when exposing a window
* that is not the one the child widget is in.
*/
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 (!gtk_cairo_should_draw_window (cr, child_in_window))
return FALSE;
return TRUE;
}
static void
union_with_clip (GtkWidget *widget,
gpointer data)
{
GdkRectangle *clip = data;
GtkAllocation widget_clip;
if (!gtk_widget_is_visible (widget) ||
!_gtk_widget_get_child_visible (widget))
return;
gtk_widget_get_clip (widget, &widget_clip);
if (clip->width == 0 || clip->height == 0)
*clip = widget_clip;
else
gdk_rectangle_union (&widget_clip, clip, clip);
}
void
gtk_container_get_children_clip (GtkContainer *container,
GtkAllocation *out_clip)
{
memset (out_clip, 0, sizeof (GtkAllocation));
gtk_container_forall (container, union_with_clip, out_clip);
}
/**
* 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_return_if_fail (_gtk_widget_get_parent (child) == GTK_WIDGET (container));
if (!gtk_container_should_propagate_draw (container, child, cr))
return;
/* 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_save (cr);
cairo_translate (cr, x, y);
gtk_widget_draw_internal (child, cr, TRUE);
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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