/* WCEMenuItemPeer.java
   Copyright (C) 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; version 2 of the License.

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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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.wce;

import java.awt.AWTException;
import java.awt.Menu;
import java.awt.MenuContainer;
import java.awt.MenuItem;
import java.awt.event.ActionEvent;
import java.awt.peer.MenuItemPeer;

public class WCEMenuItemPeer extends WCEMenuComponentPeer implements MenuItemPeer {
	/**
	 * 親がMenuの場合
	 */
	private WCEMenuPeer menuPeer;
	
	/**
	 * コマンドID
	 */
	private int commandID;
	
	WCEMenuItemPeer(MenuItem item) {
		super(item);
		MenuContainer parent = item.getParent();
		setEnabled(item.isEnabled());
	}
	
	protected WCEMenuPeer getMenuPeer() {
		return this.menuPeer;
	}
	
	void setMenuPeer(WCEMenuPeer menuPeer) {
		this.menuPeer = menuPeer;
	}
	
	/**
	 * 指定されたメニューハンドルに対して自分自身を追加する
	 */
	protected void addTo(int parentMenuHandle, String label) {
		this.commandID = addNativeTo(parentMenuHandle,
									 label);
		// 有効／無効状態を更新する
		setEnabled(((MenuItem) getMenuComponent()).isEnabled());
	}
	
	/**
	 * 指定されたメニューハンドルに対して自分自身を追加する
	 * ユニークなコマンドIDが返される。
	 */
	private native int addNativeTo(int parentMenuHandle, String label);
	
	/**
	 * このメニューアイテムのコマンドIDを返す。
	 *
	 * @return	メニューのコマンドID。設定されていない場合は0
	 */
	protected int getCommandID() {
		return this.commandID;
	}
	
	/**
	 * peerを破棄する
	 */
	public void dispose() {
		this.commandID = 0;
	}

	public void disable() {
		setEnabled(false);
	}
	
	public void enable() {
		setEnabled(true);
	}
	
	public void setEnabled(boolean enabled) {
		if (this.menuPeer != null) {
			setNativeEnabled(this.menuPeer.getMenuHandle(),
							 getCommandID(),
							 enabled);
		}
	}
	
	/**
	 * ネイティブメニューアイテムの有効／無効状態を変更する
	 */
	protected native void setNativeEnabled(int parentMenuHandle,
										   int commandID,
										   boolean enabled);
	
	public void setLabel(String text) {
		setNativeLabel(this.menuPeer.getMenuHandle(),
					   getCommandID(),
					   text);
	}
	
	/**
	 * ネイティブのラベルを変更する
	 */
	protected native void setNativeLabel(int parentMenuHandle,
										 int commandID,
										 String label);

	/**
	 * ネイティブのメニューアイテムを削除する
	 */
	private native void deleteNativeMenuItemFrom(int parentMenuHandle,
												 int commandID);


	/**
	 * ActionEventをpostする
	 */
	protected void postActionEvent(int id,
								  long when,
								  int modifiers) {
		MenuItem menuItem = (MenuItem) getMenuComponent();
		queue.postEvent(
			new ActionEvent(menuItem,
				   			id,
				   			menuItem.getActionCommand(),
				   			System.currentTimeMillis(),
				   			modifiers)
			);
	}
}
