Description Arnaud 2005-02-14 05:04:14 EST

Please found below source code to reproduce problem. This is a tiny shell 
displaying two rectangle a red and a blue on a gray background. a 
MouseMoveListener is used to check on which area of shell the mouse is, if mouse
is over red rectangle the "Red Rectangle" tooltip is displayed, the "Blue 
tooltip" is displayed if mouse is over blue rectangle. Otherwise tooltip is 
reseted (hidden) using setToolTipText(null) call.
When mouse enter shell on red area tooltip is displayed (on the bottom of shell 
but displayed), if mouse go from red to blue then come back to red are (without
flying gray area) both Red and Blue tooltip text are displayed correcly.
If mouse flies over gray area tooltip disappear due to setToolTipText(null) 
call, But if mouse goes to red or blue area none of expected tooltip are shown 
until mouse go out of shell and come back on a red/blue area (and only if last
setToolTipText() call before going outside shell wasn't a (null) call.).

In addition I'm very disappointed by the location of the tooltip: always at the 
bottom of the control which want to display it, in this little sample, tooltip 
is displayed below shell.

I've tried using Eclipse 3.0.2 (IES build 200501191352) on a Suse Linux 8.2,
window manager is QLWM.

Source code to reproduce:
package tooltip;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

/**
 * This code reproduce GTK's setToolTipText(null) problem. 
 */
public class TestTooltip 
{
	public static void main(String[]v)
	{
		 Display disp = Display.getDefault();
	     final Shell shell = new Shell(disp, SWT.DIALOG_TRIM|SWT.RESIZE );
	     shell.setText( "Test Tooltip" );
	     
	     shell.setLayout( new FillLayout() );
	     
	     final Canvas canvas = new Canvas( shell, SWT.NONE );
	     canvas.addPaintListener( new PaintListener() {
	       public void paintControl(PaintEvent e)
	       {
	       	 Rectangle r = canvas.getClientArea();
	       	 int wm = r.width/8, w2 = r.width/2;
	       	 int hm = r.height/8, h2 = r.height/2;
	       	 int rw = w2-wm, rh = r.height-2*hm;
	       	 
	       	 e.gc.setBackground( new Color(null,200,0,0) );
	       	 e.gc.fillRectangle( 0,hm,w2,rh);
	       	 e.gc.setBackground( new Color(null,0,0,200) );
	       	 e.gc.fillRectangle( w2,hm+hm,rw+wm,rh-hm);
	       }
	     });
	     canvas.addMouseMoveListener( new MouseMoveListener() {
			public void mouseMove(org.eclipse.swt.events.MouseEvent 
e) {
				int mx = e.x;
				int my = e.y;
				
				Rectangle r = canvas.getClientArea();
		       	int wm = r.width/8, w2 = r.width/2;
		       	int hm = r.height/8, h2 = r.height/2;
	       	    int rw = w2-wm, rh = r.height-2*hm;
		       	
		       	String tip = null;
 	       	    if( mx>=0 && mx <= 0+w2 && my >= hm && my <= hm+rh )
 	       	    {
 	       	      tip = "Red Rectangle";
 	       	    }
 	       	    else if( mx>=w2 && mx <= w2+rw+wm && my >= hm+hm && my <= 
hm+rh )
 	       	    {
 	       	      tip = "Blue Rectangle";
 	       	    }
System.out.println("setToolTipText("+tip+")"); 	       	    
 	       	    canvas.setToolTipText( tip );
			}
	     });

	     shell.setSize( 300, 200 );
	     shell.open();
	      
	      while (!shell.isDisposed())
	        if (!disp.readAndDispatch())
	        	disp.sleep();
	}
}