1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
29 * @Short_description: A container with just one child
32 * The #GtkBin widget is a container with just one child.
33 * It is not very useful itself, but it is useful for deriving subclasses,
34 * since it provides common code needed for handling a single child widget.
36 * Many GTK+ widgets are subclasses of #GtkBin, including #GtkWindow,
37 * #GtkButton, #GtkFrame, #GtkHandleBox or #GtkScrolledWindow.
42 #include "gtksizerequest.h"
51 static void gtk_bin_add (GtkContainer *container,
53 static void gtk_bin_remove (GtkContainer *container,
55 static void gtk_bin_forall (GtkContainer *container,
56 gboolean include_internals,
58 gpointer callback_data);
59 static GType gtk_bin_child_type (GtkContainer *container);
62 static void gtk_bin_size_request_init (GtkSizeRequestIface *iface);
63 static GtkSizeRequestMode gtk_bin_get_request_mode (GtkSizeRequest *widget);
64 static void gtk_bin_get_width_for_height (GtkSizeRequest *widget,
68 static void gtk_bin_get_height_for_width (GtkSizeRequest *widget,
71 gint *natural_height);
73 static GtkSizeRequestIface *parent_size_request_iface;
75 G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GtkBin, gtk_bin, GTK_TYPE_CONTAINER,
76 G_IMPLEMENT_INTERFACE (GTK_TYPE_SIZE_REQUEST,
77 gtk_bin_size_request_init))
80 gtk_bin_class_init (GtkBinClass *class)
82 GtkContainerClass *container_class;
84 container_class = (GtkContainerClass*) class;
86 container_class->add = gtk_bin_add;
87 container_class->remove = gtk_bin_remove;
88 container_class->forall = gtk_bin_forall;
89 container_class->child_type = gtk_bin_child_type;
91 g_type_class_add_private (class, sizeof (GtkBinPriv));
95 gtk_bin_init (GtkBin *bin)
99 bin->priv = G_TYPE_INSTANCE_GET_PRIVATE (bin,
104 gtk_widget_set_has_window (GTK_WIDGET (bin), FALSE);
111 gtk_bin_child_type (GtkContainer *container)
113 GtkBinPriv *priv = GTK_BIN (container)->priv;
116 return GTK_TYPE_WIDGET;
122 gtk_bin_add (GtkContainer *container,
125 GtkBin *bin = GTK_BIN (container);
126 GtkBinPriv *priv = bin->priv;
128 if (priv->child != NULL)
130 g_warning ("Attempting to add a widget with type %s to a %s, "
131 "but as a GtkBin subclass a %s can only contain one widget at a time; "
132 "it already contains a widget of type %s",
133 g_type_name (G_OBJECT_TYPE (child)),
134 g_type_name (G_OBJECT_TYPE (bin)),
135 g_type_name (G_OBJECT_TYPE (bin)),
136 g_type_name (G_OBJECT_TYPE (priv->child)));
140 gtk_widget_set_parent (child, GTK_WIDGET (bin));
145 gtk_bin_remove (GtkContainer *container,
148 GtkBin *bin = GTK_BIN (container);
149 GtkBinPriv *priv = bin->priv;
150 gboolean widget_was_visible;
152 g_return_if_fail (priv->child == child);
154 widget_was_visible = gtk_widget_get_visible (child);
156 gtk_widget_unparent (child);
159 /* queue resize regardless of gtk_widget_get_visible (container),
160 * since that's what is needed by toplevels, which derive from GtkBin.
162 if (widget_was_visible)
163 gtk_widget_queue_resize (GTK_WIDGET (container));
167 gtk_bin_forall (GtkContainer *container,
168 gboolean include_internals,
169 GtkCallback callback,
170 gpointer callback_data)
172 GtkBin *bin = GTK_BIN (container);
173 GtkBinPriv *priv = bin->priv;
176 (* callback) (priv->child, callback_data);
180 /* GtkBin widgets define the padding and borders independantly so
181 * we cannot provide a generic get_size() for the same reason
182 * we never implemented size_request() here.
184 * But for cases where the GtkBin class's padding is constant and
185 * does not vary based on allocation (most cases), we can at least
186 * deduce a common code path for the get_width_for_height()/get_height_for_width()
187 * cases by using the delta of the base size requsts.
190 gtk_bin_size_request_init (GtkSizeRequestIface *iface)
192 parent_size_request_iface = g_type_interface_peek_parent (iface);
194 iface->get_request_mode = gtk_bin_get_request_mode;
195 iface->get_width_for_height = gtk_bin_get_width_for_height;
196 iface->get_height_for_width = gtk_bin_get_height_for_width;
199 static GtkSizeRequestMode
200 gtk_bin_get_request_mode (GtkSizeRequest *widget)
202 GtkBin *bin = GTK_BIN (widget);
203 GtkBinPriv *priv = bin->priv;
206 return gtk_size_request_get_request_mode (GTK_SIZE_REQUEST (priv->child));
208 return GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
212 get_child_padding_delta (GtkBin *bin,
216 GtkBinPriv *priv = bin->priv;
217 gint hmin, vmin, child_hmin, child_vmin;
219 gtk_size_request_get_width (GTK_SIZE_REQUEST (bin), &hmin, NULL);
220 gtk_size_request_get_height (GTK_SIZE_REQUEST (bin), &vmin, NULL);
222 gtk_size_request_get_width (GTK_SIZE_REQUEST (priv->child), &child_hmin, NULL);
223 gtk_size_request_get_height (GTK_SIZE_REQUEST (priv->child), &child_vmin, NULL);
225 *delta_h = hmin - child_hmin;
226 *delta_v = vmin - child_vmin;
230 gtk_bin_get_width_for_height (GtkSizeRequest *widget,
235 GtkBin *bin = GTK_BIN (widget);
236 GtkBinPriv *priv = bin->priv;
237 gint hdelta, vdelta, child_min, child_nat;
241 get_child_padding_delta (bin, &hdelta, &vdelta);
243 gtk_size_request_get_width_for_height (GTK_SIZE_REQUEST (priv->child),
245 &child_min, &child_nat);
248 *minimum_width = child_min + hdelta;
251 *natural_width = child_nat + hdelta;
254 GTK_SIZE_REQUEST_GET_IFACE (widget)->get_width (widget, minimum_width, natural_width);
258 gtk_bin_get_height_for_width (GtkSizeRequest *widget,
260 gint *minimum_height,
261 gint *natural_height)
263 GtkBin *bin = GTK_BIN (widget);
264 GtkBinPriv *priv = bin->priv;
265 gint hdelta, vdelta, child_min, child_nat;
269 get_child_padding_delta (bin, &hdelta, &vdelta);
271 gtk_size_request_get_height_for_width (GTK_SIZE_REQUEST (priv->child),
273 &child_min, &child_nat);
276 *minimum_height = child_min + vdelta;
279 *natural_height = child_nat + vdelta;
282 GTK_SIZE_REQUEST_GET_IFACE (widget)->get_height (widget, minimum_height, natural_height);
290 * Gets the child of the #GtkBin, or %NULL if the bin contains
291 * no child widget. The returned widget does not have a reference
292 * added, so you do not need to unref it.
294 * Return value: (transfer none): pointer to child of the #GtkBin
297 gtk_bin_get_child (GtkBin *bin)
299 g_return_val_if_fail (GTK_IS_BIN (bin), NULL);
301 return bin->priv->child;
305 _gtk_bin_set_child (GtkBin *bin,
308 bin->priv->child = widget;