Composite: intercept mouse events (drag a button with the mouse) : MouseEvent « SWT « Java Tutorial

Composite: intercept mouse events (drag a button with the mouse)
 * 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
 * Contributors:
 *     IBM Corporation - initial API and implementation

 * Composite example snippet: intercept mouse events (drag a button with the mouse)
 * For a list of all SWT example snippets see
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class DragButtonMouseEvents {
  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    final Composite composite = new Composite(shell, SWT.NONE);
    composite.setLayout(new FillLayout());
    Button button = new Button(composite, SWT.PUSH);
    composite.setLocation(10, 10);
    final Point[] offset = new Point[1];
    Listener listener = new Listener() {
      public void handleEvent(Event event) {
        switch (event.type) {
        case SWT.MouseDown:
          Rectangle rect = composite.getBounds();
          if (rect.contains(event.x, event.y)) {
            Point pt1 = composite.toDisplay(0, 0);
            Point pt2 = shell.toDisplay(event.x, event.y);
            offset[0] = new Point(pt2.x - pt1.x, pt2.y - pt1.y);
        case SWT.MouseMove:
          if (offset[0] != null) {
            Point pt = offset[0];
            composite.setLocation(event.x - pt.x, event.y - pt.y);
        case SWT.MouseUp:
          offset[0] = null;
    shell.addListener(SWT.MouseDown, listener);
    shell.addListener(SWT.MouseUp, listener);
    shell.addListener(SWT.MouseMove, listener);
    shell.setSize(300, 300);;
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())

17.91.1.Using MouseListener, MouseMoveListener, and MouseTrackListener
17.91.2.Using MouseListenerUsing MouseListener
17.91.3.Using MouseMoveListenerUsing MouseMoveListener
17.91.4.extends MouseTrackAdapter
17.91.5.Using MouseTrackListenerUsing MouseTrackListener
17.91.6.Detect mouse enter, exit and hover eventsDetect mouse enter, exit and hover events
17.91.7.Print mouse state and button (down, move, up)Print mouse state and button (down, move, up)
17.91.8.Add Mouse Down, Up and Move eventAdd Mouse Down, Up and Move event
17.91.9.Composite: intercept mouse events (drag a button with the mouse)Composite: intercept mouse events (drag a button with the mouse)