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/*******************************************************************************
* 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;
/*
* 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 {
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;
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 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;
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 ();
}
}
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