Mega Code Archive
Composite
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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
*******************************************************************************/
/*
* Composite example snippet: intercept mouse events (drag a button with the mouse)
*
* 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.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.setEnabled(false);
composite.setLayout(new FillLayout());
Button button = new Button(composite, SWT.PUSH);
button.setText("Button");
composite.pack();
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);
}
break;
case SWT.MouseMove:
if (offset[0] != null) {
Point pt = offset[0];
composite.setLocation(event.x - pt.x, event.y - pt.y);
}
break;
case SWT.MouseUp:
offset[0] = null;
break;
}
}
};
shell.addListener(SWT.MouseDown, listener);
shell.addListener(SWT.MouseUp, listener);
shell.addListener(SWT.MouseMove, listener);
shell.setSize(300, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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