/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
/*
 *
 * @author Toni Kalajainen
 */
package org.simantics.g2d.participant;

import java.util.HashSet;
import java.util.Set;

import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;
import org.simantics.scenegraph.g2d.events.KeyEvent;
import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;
import org.simantics.scenegraph.g2d.events.KeyEvent.KeyPressedEvent;
import org.simantics.scenegraph.g2d.events.KeyEvent.KeyReleasedEvent;


/**
 * KeyStatus monitors statuses of keys.
 * @see java.awt.event.KeyEvent
 */
public class KeyUtil extends AbstractCanvasParticipant {	
	
	/** Key info */
    private Set<Integer> pressedByKeyCode = new HashSet<Integer>();
    private Set<Character> pressedByChar = new HashSet<Character>();
	
    @EventHandler(priority = Integer.MAX_VALUE)
    public boolean handleClick(KeyEvent e) {
        if (e instanceof KeyPressedEvent) {
            pressedByKeyCode.add(e.keyCode);
            pressedByChar.add(e.character);
        } else
        if (e instanceof KeyReleasedEvent) {
            pressedByKeyCode.remove(e.keyCode);
            pressedByChar.remove(e.character);
        }
        return false;
    }
    
    public boolean isCharPressed(char c)
    {
        return pressedByChar.contains(c);
    }
    
    /**
     * See awt key event 
     * @see java.awt.event.KeyEvent
     * @param keyCode
     * @return
     */
    public boolean isKeyPressed(int keyCode)
    {
        return pressedByKeyCode.contains(keyCode);
    }

}