Mega Code Archive
Create a tracker
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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.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
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.Tracker;
public class TrackerTornOff {
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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