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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/.
*/
/**
* SECTION:gtkbin
* @Short_description: A container with just one child
* @Title: GtkBin
*
* The #GtkBin widget is a container with just one child.
* It is not very useful itself, but it is useful for deriving subclasses,
* since it provides common code needed for handling a single child widget.
*
* Many GTK+ widgets are subclasses of #GtkBin, including #GtkWindow,
* #GtkButton, #GtkFrame or #GtkScrolledWindow.
*/
#include "config.h"
#include "gtkwidgetprivate.h"
#include "gtkbin.h"
typedef struct
{
GtkWidget *child;
} GtkBinPrivate;
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GtkBin, gtk_bin, GTK_TYPE_CONTAINER)
static void
gtk_bin_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkBin *bin = GTK_BIN (widget);
GtkBinPrivate *priv = gtk_bin_get_instance_private (bin);
if (priv->child && _gtk_widget_get_visible (priv->child))
gtk_widget_size_allocate (priv->child,
&(GtkAllocation) {
0, 0,
width, height
}, baseline);
}
static GType
gtk_bin_child_type (GtkContainer *container)
{
GtkBinPrivate *priv = gtk_bin_get_instance_private (GTK_BIN (container));
if (!priv->child)
return GTK_TYPE_WIDGET;
else
return G_TYPE_NONE;
}
static void
gtk_bin_add (GtkContainer *container,
GtkWidget *child)
{
GtkBin *bin = GTK_BIN (container);
GtkBinPrivate *priv = gtk_bin_get_instance_private (bin);
if (priv->child != NULL)
{
g_warning ("Attempting to add a widget with type %s to a %s, "
"but as a GtkBin subclass a %s can only contain one widget at a time; "
"it already contains a widget of type %s",
g_type_name (G_OBJECT_TYPE (child)),
g_type_name (G_OBJECT_TYPE (bin)),
g_type_name (G_OBJECT_TYPE (bin)),
g_type_name (G_OBJECT_TYPE (priv->child)));
return;
}
gtk_widget_set_parent (child, GTK_WIDGET (bin));
priv->child = child;
}
static void
gtk_bin_remove (GtkContainer *container,
GtkWidget *child)
{
GtkBin *bin = GTK_BIN (container);
GtkBinPrivate *priv = gtk_bin_get_instance_private (bin);
gboolean widget_was_visible;
g_return_if_fail (priv->child == child);
widget_was_visible = gtk_widget_get_visible (child);
gtk_widget_unparent (child);
priv->child = NULL;
/* queue resize regardless of gtk_widget_get_visible (container),
* since that's what is needed by toplevels, which derive from GtkBin.
*/
if (widget_was_visible)
gtk_widget_queue_resize (GTK_WIDGET (container));
}
static void
gtk_bin_forall (GtkContainer *container,
GtkCallback callback,
gpointer callback_data)
{
GtkBin *bin = GTK_BIN (container);
GtkBinPrivate *priv = gtk_bin_get_instance_private (bin);
if (priv->child)
(* callback) (priv->child, callback_data);
}
static void
gtk_bin_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkBinPrivate *priv = gtk_bin_get_instance_private (GTK_BIN (widget));
if (priv->child != NULL && _gtk_widget_get_visible (priv->child))
{
gtk_widget_measure (priv->child,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
else
{
*minimum = 0;
*natural = 0;
}
}
static void
gtk_bin_class_init (GtkBinClass *class)
{
GtkWidgetClass *widget_class = (GtkWidgetClass*) class;
GtkContainerClass *container_class = (GtkContainerClass*) class;
widget_class->measure = gtk_bin_measure;
widget_class->size_allocate = gtk_bin_size_allocate;
container_class->add = gtk_bin_add;
container_class->remove = gtk_bin_remove;
container_class->forall = gtk_bin_forall;
container_class->child_type = gtk_bin_child_type;
}
static void
gtk_bin_init (GtkBin *bin)
{
}
/**
* gtk_bin_get_child:
* @bin: a #GtkBin
*
* Gets the child of the #GtkBin, or %NULL if the bin contains
* no child widget. The returned widget does not have a reference
* added, so you do not need to unref it.
*
* Returns: (transfer none) (nullable): the child of @bin, or %NULL if it does
* not have a child.
**/
GtkWidget*
gtk_bin_get_child (GtkBin *bin)
{
GtkBinPrivate *priv = gtk_bin_get_instance_private (bin);
g_return_val_if_fail (GTK_IS_BIN (bin), NULL);
return priv->child;
}
void
_gtk_bin_set_child (GtkBin *bin,
GtkWidget *widget)
{
GtkBinPrivate *priv = gtk_bin_get_instance_private (bin);
priv->child = widget;
}
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