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/* GtkChoicePeer.java -- Implements ChoicePeer with GTK

   Copyright (C) 1998, 1999, 2005  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.Choice;

import java.awt.AWTEvent;

import java.awt.event.ItemEvent;

import java.awt.peer.ChoicePeer;

public class GtkChoicePeer extends GtkComponentPeer

  implements ChoicePeer

{

  private int selected;

  public GtkChoicePeer (Choice c)

  {

    super (c);

    int count = c.getItemCount ();

    if (count > 0)

      {

        for (int i = 0; i < count; i++)

          add(c.getItem(i), i);

        selected = c.getSelectedIndex();

        if (selected >= 0)

          select( selected );

      }

    else

      selected = -1;

  }

  native void create ();

  native int nativeGetSelected ();

  native void connectSignals ();

  native void selectNative (int position);

  native void selectNativeUnlocked (int position);

  public native void add (String item, int index);

  native void nativeRemove(int index);

  native void nativeRemoveAll();

  public void select (int position)

  {

    if (Thread.currentThread() == GtkMainThread.mainThread)

      selectNativeUnlocked (position);

    else

      selectNative (position);

  }

  public void remove( int index )

  {

    // Ensure the triggering of an event when removing item zero if zero is the

    // selected item, even though the selected index doesn't change.

    if( index == 0 && selected == 0 )

      selected = -1;

    nativeRemove( index );

  }

  public void removeAll()

  {

    selected = -1; // we do not want to trigger a select event here.

    nativeRemoveAll();

  }

  public void addItem (String item, int position)

  {

    add (item, position);

  }

  /**

   * Callback from the native side on an item-select event,

   * which posts an event. The event is only posted if it represents an actual

   * change. Selected is set to the peer's state initially, so that the

   * first call to select(int) from the constructor will not trigger an event.

   * (it should not)

   */

  protected void postChoiceItemEvent ( int index )

  {

    if( selected != index )

      {

        selected = index;

        postItemEvent (((Choice) awtComponent).getItem( selected ),

                       ItemEvent.SELECTED);

      }

  }

  /**

   * Catches the event and calls Choice.select() if the component state

   * needs updating.

   */

  public void handleEvent (AWTEvent event)

  {

    super.handleEvent (event);

    if (event instanceof ItemEvent)

      if (((ItemEvent)event).getItemSelectable() == awtComponent

           && ((ItemEvent)event).getStateChange() == ItemEvent.SELECTED)

        ((Choice)awtComponent).select( selected );

  }

}