/* GAIL - The GNOME Accessibility Implementation Library
 * Copyright 2001, 2002, 2003 Sun Microsystems Inc.
 *
 * 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.
 */

#include <string.h>
#include <gtk/gtk.h>
#include "gailtogglebutton.h"

static void      gail_toggle_button_class_init        (GailToggleButtonClass *klass);

static void      gail_toggle_button_toggled_gtk       (GtkWidget             *widget);

static void      gail_toggle_button_real_notify_gtk   (GObject               *obj,
                                                       GParamSpec            *pspec);

static void      gail_toggle_button_real_initialize   (AtkObject             *obj,
                                                       gpointer              data);

static AtkStateSet* gail_toggle_button_ref_state_set  (AtkObject             *accessible);

static GailButtonClass *parent_class = NULL;

GType
gail_toggle_button_get_type (void)
{
  static GType type = 0;

  if (!type)
    {
      static const GTypeInfo tinfo =
      {
        sizeof (GailToggleButtonClass),
        (GBaseInitFunc) NULL, /* base init */
        (GBaseFinalizeFunc) NULL, /* base finalize */
        (GClassInitFunc) gail_toggle_button_class_init, /* class init */
        (GClassFinalizeFunc) NULL, /* class finalize */
        NULL, /* class data */
        sizeof (GailToggleButton), /* instance size */
        0, /* nb preallocs */
        (GInstanceInitFunc) NULL, /* instance init */
        NULL /* value table */
      };

      type = g_type_register_static (GAIL_TYPE_BUTTON,
                                     "GailToggleButton", &tinfo, 0);
    }

  return type;
}

static void
gail_toggle_button_class_init (GailToggleButtonClass *klass)
{
  GailWidgetClass *widget_class;
  AtkObjectClass *class = ATK_OBJECT_CLASS (klass);

  widget_class = (GailWidgetClass*)klass;
  widget_class->notify_gtk = gail_toggle_button_real_notify_gtk;

  parent_class = g_type_class_peek_parent (klass);

  class->ref_state_set = gail_toggle_button_ref_state_set;
  class->initialize = gail_toggle_button_real_initialize;
}

AtkObject* 
gail_toggle_button_new (GtkWidget *widget)
{
  GObject *object;
  AtkObject *accessible;

  g_return_val_if_fail (GTK_IS_TOGGLE_BUTTON (widget), NULL);

  object = g_object_new (GAIL_TYPE_TOGGLE_BUTTON, NULL);

  accessible = ATK_OBJECT (object);
  atk_object_initialize (accessible, widget);

  return accessible;
}

static void
gail_toggle_button_real_initialize (AtkObject *obj,
                                    gpointer  data)
{
  ATK_OBJECT_CLASS (parent_class)->initialize (obj, data);

  g_signal_connect (data,
                    "toggled",
                    G_CALLBACK (gail_toggle_button_toggled_gtk),
                    NULL);

  if (GTK_IS_CHECK_BUTTON (data))
    obj->role = ATK_ROLE_CHECK_BOX;
  else
    obj->role = ATK_ROLE_TOGGLE_BUTTON;
}

static void
gail_toggle_button_toggled_gtk (GtkWidget       *widget)
{
  AtkObject *accessible;
  GtkToggleButton *toggle_button;

  toggle_button = GTK_TOGGLE_BUTTON (widget);

  accessible = gtk_widget_get_accessible (widget);
  atk_object_notify_state_change (accessible, ATK_STATE_CHECKED, 
                                  toggle_button->active);
} 

static AtkStateSet*
gail_toggle_button_ref_state_set (AtkObject *accessible)
{
  AtkStateSet *state_set;
  GtkToggleButton *toggle_button;
  GtkWidget *widget;

  state_set = ATK_OBJECT_CLASS (parent_class)->ref_state_set (accessible);
  widget = GTK_ACCESSIBLE (accessible)->widget;
 
  if (widget == NULL)
    return state_set;

  toggle_button = GTK_TOGGLE_BUTTON (widget);

  if (gtk_toggle_button_get_active (toggle_button))
    atk_state_set_add_state (state_set, ATK_STATE_CHECKED);

  if (gtk_toggle_button_get_inconsistent (toggle_button))
    atk_state_set_remove_state (state_set, ATK_STATE_ENABLED);
 
  return state_set;
}

static void
gail_toggle_button_real_notify_gtk (GObject           *obj,
                                    GParamSpec        *pspec)
{
  GtkToggleButton *toggle_button = GTK_TOGGLE_BUTTON (obj);
  AtkObject *atk_obj;

  atk_obj = gtk_widget_get_accessible (GTK_WIDGET (toggle_button));

  if (strcmp (pspec->name, "inconsistent") == 0)
    atk_object_notify_state_change (atk_obj, ATK_STATE_ENABLED,
                       !gtk_toggle_button_get_inconsistent (toggle_button));
  else
    GAIL_WIDGET_CLASS (parent_class)->notify_gtk (obj, pspec);
}