/*
 * GTK - The GIMP Toolkit
 * Copyright (C) 1998, 1999 Red Hat, Inc.
 * All rights reserved.
 *
 * This Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the Gnome Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Author: James Henstridge <james@daa.com.au>
 *
 * Modified by the GTK+ Team and others 2003.  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 "gtktoggleaction.h"
#include "gtktoggleactionprivate.h"
#include "gtktoggletoolbutton.h"
#include "gtktogglebutton.h"
#include "gtkcheckmenuitem.h"

enum 
{
  TOGGLED,
  LAST_SIGNAL
};

static void gtk_toggle_action_init       (GtkToggleAction *action);
static void gtk_toggle_action_class_init (GtkToggleActionClass *class);

GType
gtk_toggle_action_get_type (void)
{
  static GtkType type = 0;

  if (!type)
    {
      static const GTypeInfo type_info =
      {
        sizeof (GtkToggleActionClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gtk_toggle_action_class_init,
        (GClassFinalizeFunc) NULL,
        NULL,
        
        sizeof (GtkToggleAction),
        0, /* n_preallocs */
        (GInstanceInitFunc) gtk_toggle_action_init,
      };

      type = g_type_register_static (GTK_TYPE_ACTION,
                                     "GtkToggleAction",
                                     &type_info, 0);
    }
  return type;
}

static void gtk_toggle_action_activate     (GtkAction *action);
static void gtk_toggle_action_real_toggled (GtkToggleAction *action);
static void connect_proxy                  (GtkAction *action,
					    GtkWidget *proxy);
static void disconnect_proxy               (GtkAction *action,
					    GtkWidget *proxy);

static GObjectClass *parent_class = NULL;
static guint         action_signals[LAST_SIGNAL] = { 0 };

static void
gtk_toggle_action_class_init (GtkToggleActionClass *klass)
{
  GObjectClass *gobject_class;
  GtkActionClass *action_class;

  parent_class = g_type_class_peek_parent (klass);
  gobject_class = G_OBJECT_CLASS (klass);
  action_class = GTK_ACTION_CLASS (klass);

  action_class->activate = gtk_toggle_action_activate;
  action_class->connect_proxy = connect_proxy;
  action_class->disconnect_proxy = disconnect_proxy;

  action_class->menu_item_type = GTK_TYPE_CHECK_MENU_ITEM;
  action_class->toolbar_item_type = GTK_TYPE_TOGGLE_TOOL_BUTTON;

  klass->toggled = gtk_toggle_action_real_toggled;

  action_signals[TOGGLED] =
    g_signal_new ("toggled",
                  G_OBJECT_CLASS_TYPE (klass),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (GtkToggleActionClass, toggled),
		  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

  g_type_class_add_private (gobject_class, sizeof (GtkToggleActionPrivate));
}

static void
gtk_toggle_action_init (GtkToggleAction *action)
{
  action->private_data = GTK_TOGGLE_ACTION_GET_PRIVATE (action);
  action->private_data->active = FALSE;
}

static void
gtk_toggle_action_activate (GtkAction *action)
{
  GtkToggleAction *toggle_action;

  g_return_if_fail (GTK_IS_TOGGLE_ACTION (action));

  toggle_action = GTK_TOGGLE_ACTION (action);

  toggle_action->private_data->active = !toggle_action->private_data->active;

  gtk_toggle_action_toggled (toggle_action);
}

static void
gtk_toggle_action_real_toggled (GtkToggleAction *action)
{
  GSList *slist;

  g_return_if_fail (GTK_IS_TOGGLE_ACTION (action));

  for (slist = gtk_action_get_proxies (GTK_ACTION (action)); slist; slist = slist->next)
    {
      GtkWidget *proxy = slist->data;

      gtk_action_block_activate_from (GTK_ACTION (action), proxy);
      if (GTK_IS_CHECK_MENU_ITEM (proxy))
	gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (proxy),
					action->private_data->active);
      else if (GTK_IS_TOGGLE_TOOL_BUTTON (proxy))
	gtk_toggle_tool_button_set_active (GTK_TOGGLE_TOOL_BUTTON (proxy),
					   action->private_data->active);
      else if (GTK_IS_TOGGLE_BUTTON (proxy))
	gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (proxy),
				      action->private_data->active);
      else {
	g_warning ("Don't know how to toggle `%s' widgets",
		   G_OBJECT_TYPE_NAME (proxy));
      }
      gtk_action_unblock_activate_from (GTK_ACTION (action), proxy);
    }
}

static void
connect_proxy (GtkAction *action, 
	       GtkWidget *proxy)
{
  GtkToggleAction *toggle_action;

  toggle_action = GTK_TOGGLE_ACTION (action);

  /* do this before hand, so that we don't call the "activate" handler */
  if (GTK_IS_MENU_ITEM (proxy))
    gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (proxy),
				    toggle_action->private_data->active);
  else if (GTK_IS_TOGGLE_TOOL_BUTTON (proxy))
    gtk_toggle_tool_button_set_active (GTK_TOGGLE_TOOL_BUTTON (proxy),
				       toggle_action->private_data->active);
  else if (GTK_IS_TOGGLE_BUTTON (proxy))
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (proxy),
				  toggle_action->private_data->active);

  (* GTK_ACTION_CLASS (parent_class)->connect_proxy) (action, proxy);
}

static void
disconnect_proxy (GtkAction *action, 
		  GtkWidget *proxy)
{
  GtkToggleAction *toggle_action;

  toggle_action = GTK_TOGGLE_ACTION (action);

  (* GTK_ACTION_CLASS (parent_class)->disconnect_proxy) (action, proxy);
}

/**
 * gtk_toggle_action_toggled:
 * @action: the action object
 *
 * Emits the "toggled" signal on the toggle action.
 *
 * Since: 2.4
 */
void
gtk_toggle_action_toggled (GtkToggleAction *action)
{
  g_return_if_fail (GTK_IS_TOGGLE_ACTION (action));

  g_signal_emit (action, action_signals[TOGGLED], 0);
}

/**
 * gtk_toggle_action_set_active:
 * @action: the action object
 * @is_active: whether the action should be checked or not
 *
 * Sets the checked state on the toggle action.
 *
 * Since: 2.4
 */
void
gtk_toggle_action_set_active (GtkToggleAction *action, 
			      gboolean         is_active)
{
  g_return_if_fail (GTK_IS_TOGGLE_ACTION (action));

  is_active = is_active != FALSE;

  if (action->private_data->active != is_active)
    {
      gtk_action_activate (GTK_ACTION (action));
    }
}

/**
 * gtk_toggle_action_get_active:
 * @action: the action object
 *
 * Returns: the checked state of the toggle action
 *
 * Since: 2.4
 */
gboolean
gtk_toggle_action_get_active (GtkToggleAction *action)
{
  g_return_val_if_fail (GTK_IS_TOGGLE_ACTION (action), FALSE);

  return action->private_data->active;
}