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Creating a GUI With JFC/Swing
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Drag and Drop and Data Transfer
Drop Location Rendering
This is a more advanced topic and most people do not need to worry about it.
However, if you have a custom component you will need to handle
the drop location rendering yourself.
You can register to be notified whenever the
dropLocation property changes.
You would listen for this change and
do your own rendering of the drop location in a custom renderer
for the component or in the paintComponent method,
using the getDropLocation method.
Here is an example of listening for the dropLocation
property:
class Repainter extends PropertyChangeListener {
public void propertyChange(PropertyChangeEvent pce) {
repaintDropLocation(pce.getOldValue());
repaintDropLocation(pce.getNewValue());
}
}
comp.addPropertyChangeListener("dropLocation", newRepainter());
Here is an example of the paintComponent approach:
public void paintComponent(Graphics g) {
super.paintComponent(g);
DropLocation loc= getDropLocation();
if (loc == null) {
return;
}
renderPrettyIndicatorAt(loc);
}
