Indeed it does not update itself, even when resetting the tooltip to null between calls.
So far, the only trick I found was to simulate a mouse-move event and forward it on the TooltipManager. It makes him think that the mouse has moved and that the tooltip must be relocated. Not pretty, but quite efficient.
Have a look at this demo code which displays a progress in % from 0 to 100:
import java.awt.MouseInfo;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.ToolTipManager;
public class TestTooltips {
protected static void initUI() {
JFrame frame = new JFrame("test");
final JLabel label = new JLabel("Label text");
frame.add(label);
frame.pack();
frame.setVisible(true);
Timer t = new Timer(1000, new ActionListener() {
int progress = 0;
@Override
public void actionPerformed(ActionEvent e) {
if (progress > 100) {
progress = 0;
}
label.setToolTipText("Progress: " + progress + " %");
Point locationOnScreen = MouseInfo.getPointerInfo().getLocation();
Point locationOnComponent = new Point(locationOnScreen);
SwingUtilities.convertPointFromScreen(locationOnComponent, label);
if (label.contains(locationOnComponent)) {
ToolTipManager.sharedInstance().mouseMoved(
new MouseEvent(label, -1, System.currentTimeMillis(), 0, locationOnComponent.x, locationOnComponent.y,
locationOnScreen.x, locationOnScreen.y, 0, false, 0));
}
progress++;
}
});
t.start();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
initUI();
}
});
}
}
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