The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
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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); }