/**
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.eclipse.rulebuilder.ui;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.widgets.Text;
public class NumericKeyFilter implements KeyListener {
private Text box;
public NumericKeyFilter(Text box){
this.box = box;
box.addKeyListener(this);
}
public void keyPressed(KeyEvent e) {
char c = e.character;
if (Character.isLetter( c ) && c != '='
&& !(this.box.getText().startsWith( "=" ))) {
e.doit = false;
}
}
public void keyReleased(KeyEvent e) {
}
}