Bug 285401

Description Andrei Diaconu 2009-08-03 04:57:08 EDT

Run the following snippet. Click on the tree and drag the mouse, so that a tracker appears. While the tracker is open, the tree item under the top left corner of the tracker is selected.

Move the mouse so that the selected item changes. You will notice that some parts of the tracker do not get deleted, and are left visible.

Here is the snippet:

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.*;

public class TrackerCheese {
	public static void main(String[] args) {
		final Display display = new Display();
		final Shell shell = new Shell(display);
		shell.setSize(200, 200);
		shell.setLayout(new FillLayout());

		final Tree tree = new Tree(shell, SWT.NONE);
		for (int i = 0; i < 3; i++) {
			TreeItem item = new TreeItem(tree, SWT.NONE);
			item.setText(Integer.toString(i));
		}

		tree.addListener(SWT.MouseDown, new Listener() {
			@Override
			public void handleEvent(Event e) {
				final Tracker tracker = new Tracker(tree, SWT.RESIZE);
				tracker.setRectangles(new Rectangle[] {new Rectangle(e.x, e.y,
						0, 0)});
				tracker.addListener(SWT.Resize, new Listener() {
					@Override
					public void handleEvent(Event e) {
						final Rectangle rectangle = tracker.getRectangles()[0];
						final TreeItem item = tree.getItem(new Point(
								rectangle.x, rectangle.y));
						if (item != null) {
							tree.setSelection(item);
						} else {
							tree.setSelection(new TreeItem[0]);
						}
					}
				});
				tracker.open();
			}
		});

		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}