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/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.editor.ext;

import java.awt.Component;
import java.awt.KeyboardFocusManager;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
import java.util.LinkedList;
import javax.swing.text.JTextComponent;

/**
*
* @author Dusan Balek
*/
public class KeyEventBlocker implements KeyListener {

    private LinkedList blockedEvents = new LinkedList();
    private JTextComponent component;
    private boolean discardKeyTyped = true;

    public KeyEventBlocker(JTextComponent component, boolean discardFirstKeyTypedEvent) {
        this.component = component;
        this.discardKeyTyped = discardFirstKeyTypedEvent;
        this.component.addKeyListener(this);
    }

    /** Has to be called from AWT event thread to be properly synchronized */
    public void stopBlocking() {
        this.component.removeKeyListener(this);
        KeyboardFocusManager kfm = KeyboardFocusManager.getCurrentKeyboardFocusManager();
        while(!blockedEvents.isEmpty()) {
            KeyEvent e = (KeyEvent)blockedEvents.removeFirst();
            e = new KeyEvent((Component)e.getSource(), e.getID(), e.getWhen(), e.getModifiers(), e.getKeyCode(), e.getKeyChar(), e.getKeyLocation());
            kfm.dispatchEvent(e);
        }
    }

    public void keyPressed(KeyEvent e) {
        e.consume();
        blockedEvents.add(e);
    }

    public void keyReleased(KeyEvent e) {
        e.consume();
        blockedEvents.add(e);
    }

    public void keyTyped(KeyEvent e) {
        e.consume();
        if (discardKeyTyped) {
            discardKeyTyped = false;
        } else {
            blockedEvents.add(e);
        }
    }
}