Create a tracker on mouse down : Tracker « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. Tracker

import org.eclipse.swt.SWT;
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 TrackerMouseDown {

  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.open();
    shell.addListener(SWT.MouseDown, new Listener() {
      public void handleEvent(Event e) {
        Tracker tracker = new Tracker(shell, SWT.NONE);
        tracker.setRectangles(new Rectangle[] { new Rectangle(e.x, e.y, 100, 100), });
        tracker.open();
      }
    });
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

17.35.Tracker
	17.35.1.	Create a tracker on mouse down
	17.35.2.	Create a tracker: drag when torn off