gtkbin.c 4.76 KB
Newer Older
Elliot Lee's avatar
Elliot Lee committed
1 2 3 4
/* 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
5
 * modify it under the terms of the GNU Lesser General Public
Elliot Lee's avatar
Elliot Lee committed
6 7 8 9 10 11
 * 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
12
 * Lesser General Public License for more details.
Elliot Lee's avatar
Elliot Lee committed
13
 *
14
 * You should have received a copy of the GNU Lesser General Public
15 16 17
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
Elliot Lee's avatar
Elliot Lee committed
18
 */
19 20

/*
21
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
22 23 24 25 26
 * 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/. 
 */

Elliot Lee's avatar
Elliot Lee committed
27 28 29
#include "gtkbin.h"


Manish Singh's avatar
Manish Singh committed
30 31 32 33 34 35 36 37 38 39 40
static void gtk_bin_class_init  (GtkBinClass    *klass);
static void gtk_bin_init        (GtkBin         *bin);
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);
Elliot Lee's avatar
Elliot Lee committed
41 42 43 44 45


static GtkContainerClass *parent_class = NULL;


Manish Singh's avatar
Manish Singh committed
46
GType
47
gtk_bin_get_type (void)
Elliot Lee's avatar
Elliot Lee committed
48
{
Manish Singh's avatar
Manish Singh committed
49
  static GType bin_type = 0;
Elliot Lee's avatar
Elliot Lee committed
50 51 52

  if (!bin_type)
    {
53
      static const GTypeInfo bin_info =
Elliot Lee's avatar
Elliot Lee committed
54 55
      {
	sizeof (GtkBinClass),
Manish Singh's avatar
Manish Singh committed
56 57
	NULL,		/* base_init */
	NULL,		/* base_finalize */
58
	(GClassInitFunc) gtk_bin_class_init,
Manish Singh's avatar
Manish Singh committed
59 60
	NULL,		/* class_finalize */
	NULL,		/* class_data */
61
	sizeof (GtkBin),
Manish Singh's avatar
Manish Singh committed
62
	0,		/* n_preallocs */
63
	(GInstanceInitFunc) gtk_bin_init,
Manish Singh's avatar
Manish Singh committed
64
	NULL,		/* value_table */
Elliot Lee's avatar
Elliot Lee committed
65 66
      };

67 68
      bin_type = g_type_register_static (GTK_TYPE_CONTAINER, "GtkBin", 
					 &bin_info, G_TYPE_FLAG_ABSTRACT);
Elliot Lee's avatar
Elliot Lee committed
69 70 71 72 73 74 75 76 77 78 79 80
    }

  return bin_type;
}

static void
gtk_bin_class_init (GtkBinClass *class)
{
  GtkContainerClass *container_class;

  container_class = (GtkContainerClass*) class;

Manish Singh's avatar
Manish Singh committed
81
  parent_class = g_type_class_peek_parent (class);
Elliot Lee's avatar
Elliot Lee committed
82 83 84

  container_class->add = gtk_bin_add;
  container_class->remove = gtk_bin_remove;
85
  container_class->forall = gtk_bin_forall;
86
  container_class->child_type = gtk_bin_child_type;
Elliot Lee's avatar
Elliot Lee committed
87 88 89 90 91 92 93 94 95 96 97
}

static void
gtk_bin_init (GtkBin *bin)
{
  GTK_WIDGET_SET_FLAGS (bin, GTK_NO_WINDOW);

  bin->child = NULL;
}


Manish Singh's avatar
Manish Singh committed
98
static GType
99 100 101 102 103
gtk_bin_child_type (GtkContainer *container)
{
  if (!GTK_BIN (container)->child)
    return GTK_TYPE_WIDGET;
  else
Manish Singh's avatar
Manish Singh committed
104
    return G_TYPE_NONE;
105 106
}

Elliot Lee's avatar
Elliot Lee committed
107 108
static void
gtk_bin_add (GtkContainer *container,
109
	     GtkWidget    *child)
Elliot Lee's avatar
Elliot Lee committed
110
{
111
  GtkBin *bin = GTK_BIN (container);
Elliot Lee's avatar
Elliot Lee committed
112

113
  g_return_if_fail (GTK_IS_WIDGET (child));
Elliot Lee's avatar
Elliot Lee committed
114

115 116 117 118 119
  if (bin->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",
Tim Janik's avatar
Tim Janik committed
120 121 122 123
                 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 (bin->child)));
124 125
      return;
    }
Elliot Lee's avatar
Elliot Lee committed
126

127 128
  gtk_widget_set_parent (child, GTK_WIDGET (bin));
  bin->child = child;
Elliot Lee's avatar
Elliot Lee committed
129 130 131 132
}

static void
gtk_bin_remove (GtkContainer *container,
133
		GtkWidget    *child)
Elliot Lee's avatar
Elliot Lee committed
134
{
135
  GtkBin *bin = GTK_BIN (container);
136
  gboolean widget_was_visible;
Elliot Lee's avatar
Elliot Lee committed
137

138 139
  g_return_if_fail (GTK_IS_WIDGET (child));
  g_return_if_fail (bin->child == child);
Elliot Lee's avatar
Elliot Lee committed
140

141 142 143 144 145 146 147 148 149 150
  widget_was_visible = GTK_WIDGET_VISIBLE (child);
  
  gtk_widget_unparent (child);
  bin->child = NULL;
  
  /* queue resize regardless of GTK_WIDGET_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));
Elliot Lee's avatar
Elliot Lee committed
151 152 153
}

static void
154 155 156 157
gtk_bin_forall (GtkContainer *container,
		gboolean      include_internals,
		GtkCallback   callback,
		gpointer      callback_data)
Elliot Lee's avatar
Elliot Lee committed
158
{
159
  GtkBin *bin = GTK_BIN (container);
Elliot Lee's avatar
Elliot Lee committed
160 161 162 163 164 165

  g_return_if_fail (callback != NULL);

  if (bin->child)
    (* callback) (bin->child, callback_data);
}
Havoc Pennington's avatar
Havoc Pennington committed
166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183

/**
 * 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: 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->child;
}