xdev.ui.event.KeyActionAdapter Maven / Gradle / Ivy
package xdev.ui.event;
/*-
* #%L
* XDEV Application Framework
* %%
* Copyright (C) 2003 - 2020 XDEV Software
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
import java.awt.event.*;
/**
* Simplification of the {@link KeyListener} interface.
*
* In this key listener adapter it is only necessary to handle one method:
* {@link #keyActionPerformed(KeyEvent)}.
*
* @author XDEV Software
*/
public abstract class KeyActionAdapter implements KeyListener
{
private boolean letterOrDigit = false;
private int keyCode = 0;
/**
* {@inheritDoc}
*/
public void keyPressed(KeyEvent e)
{
if(Character.isLetterOrDigit(e.getKeyChar()))
{
keyCode = e.getKeyCode();
letterOrDigit = true;
}
else
{
letterOrDigit = false;
keyActionPerformed(e);
}
}
/**
* {@inheritDoc}
*/
public void keyReleased(KeyEvent e)
{
}
/**
* {@inheritDoc}
*/
public void keyTyped(KeyEvent e)
{
if(letterOrDigit)
{
e.setKeyCode(keyCode);
keyActionPerformed(e);
}
}
/**
* Invoked only once when a key has been pressed or typed.
*
* @param e
* the event object
*/
public abstract void keyActionPerformed(KeyEvent e);
}