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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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* 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, #GtkHandleBox or #GtkScrolledWindow.
*/
#include "config.h"
#include "gtkbin.h"
#include "gtksizerequest.h"
#include "gtkintl.h"
struct _GtkBinPrivate
{
GtkWidget *child;
};
static void gtk_bin_add (GtkContainer *container,
GtkWidget *widget);
static void gtk_bin_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_bin_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static GType gtk_bin_child_type (GtkContainer *container);
static void gtk_bin_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width,
gint *natural_width);
static void gtk_bin_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height);
G_DEFINE_ABSTRACT_TYPE (GtkBin, gtk_bin, GTK_TYPE_CONTAINER)
static void
gtk_bin_class_init (GtkBinClass *class)
{
GtkWidgetClass *widget_class = (GtkWidgetClass*) class;
GtkContainerClass *container_class = (GtkContainerClass*) class;
widget_class->get_preferred_width_for_height = gtk_bin_get_preferred_width_for_height;
widget_class->get_preferred_height_for_width = gtk_bin_get_preferred_height_for_width;
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;
g_type_class_add_private (class, sizeof (GtkBinPrivate));
}
static void
gtk_bin_init (GtkBin *bin)
{
GtkBinPrivate *priv;
bin->priv = G_TYPE_INSTANCE_GET_PRIVATE (bin,
GTK_TYPE_BIN,
GtkBinPrivate);
priv = bin->priv;
gtk_widget_set_has_window (GTK_WIDGET (bin), FALSE);
priv->child = NULL;
}
static GType
gtk_bin_child_type (GtkContainer *container)
{
GtkBinPrivate *priv = GTK_BIN (container)->priv;
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 = bin->priv;
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 = bin->priv;
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,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkBin *bin = GTK_BIN (container);
GtkBinPrivate *priv = bin->priv;
if (priv->child)
(* callback) (priv->child, callback_data);
}
/* GtkBin widgets define the padding and borders independantly so
* we cannot provide a generic get_size() for the same reason
* we never implemented size_request() here.
*
* But for cases where the GtkBin class's padding is constant and
* does not vary based on allocation (most cases), we can at least
* deduce a common code path for the get_width_for_height()/get_height_for_width()
* cases by using the delta of the base size requsts.
*/
static void
get_child_padding_delta (GtkBin *bin,
gint *delta_h,
gint *delta_v)
{
GtkBinPrivate *priv = bin->priv;
gint hmin, vmin, hnat, vnat, child_hmin, child_vmin;
/* we can't use gtk_widget_get_preferred_width() wrapper
* because we want our "original" request, not any external
* adjustments from set_size_request() or whatever. we have
* to ask for natural also because NULL isn't allowed for the
* direct vfuncs
*/
GTK_WIDGET_GET_CLASS (bin)->get_preferred_width (GTK_WIDGET (bin), &hmin, &hnat);
GTK_WIDGET_GET_CLASS (bin)->adjust_size_request (GTK_WIDGET (bin),
GTK_ORIENTATION_HORIZONTAL, &hmin, &hnat);
GTK_WIDGET_GET_CLASS (bin)->get_preferred_height (GTK_WIDGET (bin), &vmin, &vnat);
GTK_WIDGET_GET_CLASS (bin)->adjust_size_request (GTK_WIDGET (bin),
GTK_ORIENTATION_VERTICAL, &vmin, &vnat);
gtk_widget_get_preferred_width (priv->child, &child_hmin, NULL);
gtk_widget_get_preferred_height (priv->child, &child_vmin, NULL);
*delta_h = hmin - child_hmin;
*delta_v = vmin - child_vmin;
}
static void
gtk_bin_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width,
gint *natural_width)
{
GtkBin *bin = GTK_BIN (widget);
GtkBinPrivate *priv = bin->priv;
gint hdelta, vdelta, child_min, child_nat;
if (priv->child)
{
get_child_padding_delta (bin, &hdelta, &vdelta);
gtk_widget_get_preferred_width_for_height (priv->child,
height - vdelta,
&child_min, &child_nat);
if (minimum_width)
*minimum_width = child_min + hdelta;
if (natural_width)
*natural_width = child_nat + hdelta;
}
else
GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, minimum_width, natural_width);
}
static void
gtk_bin_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height)
{
GtkBin *bin = GTK_BIN (widget);
GtkBinPrivate *priv = bin->priv;
gint hdelta, vdelta, child_min, child_nat;
if (priv->child)
{
get_child_padding_delta (bin, &hdelta, &vdelta);
gtk_widget_get_preferred_height_for_width (priv->child,
width - hdelta,
&child_min, &child_nat);
if (minimum_height)
*minimum_height = child_min + vdelta;
if (natural_height)
*natural_height = child_nat + vdelta;
}
else
GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, minimum_height, natural_height);
}
/**
* 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.
*
* Return value: (transfer none): pointer to child of the #GtkBin
**/
GtkWidget*
gtk_bin_get_child (GtkBin *bin)
{
g_return_val_if_fail (GTK_IS_BIN (bin), NULL);
return bin->priv->child;
}
void
_gtk_bin_set_child (GtkBin *bin,
GtkWidget *widget)
{
bin->priv->child = widget;
}
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