Intercept mouse events (drag a button with the mouse)
/*
* Composite example snippet: intercept mouse events (drag a button with the mouse)
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#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 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 = 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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