| /******************************************************************************* |
| * Copyright (c) 2000, 2013 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; |
| |
| /* |
| * Tracker example snippet: create a tracker (drag when "torn off") |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| */ |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet31 { |
| |
| static Tracker tracker = null; |
| public static void main (String [] args) { |
| final Display display = new Display (); |
| final Shell shell = new Shell (display); |
| shell.setSize (200, 200); |
| shell.open (); |
| Listener listener = new Listener () { |
| Point point = null; |
| static final int JITTER = 8; |
| @Override |
| public void handleEvent (Event event) { |
| switch (event.type) { |
| case SWT.MouseDown: |
| point = new Point (event.x, event.y); |
| break; |
| case SWT.MouseMove: |
| if (point == null) return; |
| int deltaX = point.x - event.x, deltaY = point.y - event.y; |
| if (Math.abs (deltaX) < JITTER && Math.abs (deltaY) < JITTER) { |
| return; |
| } |
| tracker = new Tracker (display, SWT.NONE); |
| Rectangle rect = display.map (shell, null, shell.getClientArea ()); |
| rect.x -= deltaX; |
| rect.y -= deltaY; |
| tracker.setRectangles (new Rectangle [] {rect}); |
| tracker.open (); |
| //FALL THROUGH |
| case SWT.MouseUp: |
| point = null; |
| if (tracker != null) { |
| tracker.dispose (); |
| tracker = null; |
| } |
| break; |
| } |
| } |
| }; |
| shell.addListener (SWT.MouseDown, listener); |
| shell.addListener (SWT.MouseMove, listener); |
| shell.addListener (SWT.MouseUp, listener); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch ()) display.sleep (); |
| } |
| display.dispose (); |
| } |
| } |