Verify input (only allow digits) : Text Event « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. Text Event

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
//package org.eclipse.swt.snippets;
/*
 * Text example snippet: verify input (only allow digits)
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class TextVerifyInputDigits {

  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Text text = new Text(shell, SWT.BORDER | SWT.V_SCROLL);
    text.setBounds(10, 10, 200, 200);
    text.addListener(SWT.Verify, new Listener() {
      public void handleEvent(Event e) {
        String string = e.text;
        char[] chars = new char[string.length()];
        string.getChars(0, chars.length, chars, 0);
        for (int i = 0; i < chars.length; i++) {
          if (!('0' <= chars[i] && chars[i] <= '9')) {
            e.doit = false;
            return;
          }
        }
      }
    });
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

17.18.Text Event
	17.18.1.	Add focus in/out event to Text
	17.18.2.	Add KeyEvent listener to Text
	17.18.3.	Listen to key Traversed event
	17.18.4.	Use a regular expression to verify input(a phone number is used)
	17.18.5.	Add events to Text: MouseDown, MouseMove, MouseUp, KeyDown, KeyUp Resize
	17.18.6.	Detect when the user scrolls a text control
	17.18.7.	Verify input (format for date)
	17.18.8.	Verify input (only allow digits)
	17.18.9.	Text TraverseListener: Tab key event (override Tab behavior to traverse out of a Text)
	17.18.10.	Text default selection event(Return/Enter key)
	17.18.11.	Add default selection listener to Text