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/* GtkCheckboxPeer.java -- Implements CheckboxPeer with GTK

   Copyright (C) 1998, 1999, 2002, 2003 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.java.awt.peer.gtk;

import java.awt.Checkbox;

import java.awt.CheckboxGroup;

import java.awt.peer.CheckboxPeer;

public class GtkCheckboxPeer extends GtkComponentPeer

  implements CheckboxPeer

{

  // Group from last time it was set.

  public GtkCheckboxGroupPeer old_group;

  // The current state of the GTK checkbox.

  private boolean currentState;

  private boolean changing = false;

  public native void create (GtkCheckboxGroupPeer group);

  public native void nativeSetCheckboxGroup (GtkCheckboxGroupPeer group);

  public native void connectSignals ();

  native void gtkWidgetModifyFont (String name, int style, int size);

  native void gtkButtonSetLabel (String label);

  native void gtkToggleButtonSetActive (boolean is_active);

  public GtkCheckboxPeer (Checkbox c)

  {

    super (c);

  }

  // FIXME: we must be able to switch between a checkbutton and a

  // radiobutton dynamically.

  public void create ()

  {

    Checkbox checkbox = (Checkbox) awtComponent;

    CheckboxGroup g = checkbox.getCheckboxGroup ();

    old_group = GtkCheckboxGroupPeer.getCheckboxGroupPeer (g);

    create (old_group);

    gtkToggleButtonSetActive (checkbox.getState ());

    gtkButtonSetLabel (checkbox.getLabel ());

  }

  public void setState (boolean state)

  {

    // prevent item_toggled_cb -> postItemEvent ->

    // awtComponent.setState -> this.setState ->

    // gtkToggleButtonSetActive self-deadlock on the GDK lock.

    if (changing && Thread.currentThread() == GtkToolkit.mainThread)

      {

        changing = false;

        return;

      }

    if (currentState != state)

      gtkToggleButtonSetActive (state);

  }

  public void setLabel (String label)

  {

    gtkButtonSetLabel (label);

  }

  public void setCheckboxGroup (CheckboxGroup group)

  {

    GtkCheckboxGroupPeer gp

      = GtkCheckboxGroupPeer.getCheckboxGroupPeer (group);

    if (gp != old_group)

      {

        if (old_group != null)

          old_group.remove (this);

        nativeSetCheckboxGroup (gp);

        old_group = gp;

      }

  }

  // Override the superclass postItemEvent so that the peer doesn't

  // need information that we have.

  // called back by native side: item_toggled_cb

  public void postItemEvent (Object item, int stateChange)

  {

    Checkbox currentCheckBox = ((Checkbox)awtComponent);

    // A firing of the event is only desired if the state has changed due to a 

    // button press. The currentCheckBox's state must be different from the 

    // one that the stateChange is changing to. 

    // stateChange = 1 if it goes from false -> true

    // stateChange = 2 if it goes from true -> false

    if (( !currentCheckBox.getState() && stateChange == 1)

        || (currentCheckBox.getState() && stateChange == 2))

    {

      super.postItemEvent (awtComponent, stateChange);

      currentState = !currentCheckBox.getState();

      changing = true;

      currentCheckBox.setState(currentState);

    }

  }

  public void dispose ()

  {

    // Notify the group so that the native state can be cleaned up

    // appropriately.

    if (old_group != null)

      old_group.remove (this);

    super.dispose ();

  }

}