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/*******************************************************************************
* Copyright (c) 2000, 2016 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;
/*
* 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.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet46 {
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 = 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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