W3cubDocs

/OpenJDK 21

Interface HierarchyListener

All Superinterfaces:
EventListener
All Known Implementing Classes:
AWTEventMulticaster
public interface HierarchyListener extends EventListener
The listener interface for receiving hierarchy changed events. The class that is interested in processing a hierarchy changed event should implement this interface. The listener object created from that class is then registered with a Component using the Component's addHierarchyListener method. When the hierarchy to which the Component belongs changes, the hierarchyChanged method in the listener object is invoked, and the HierarchyEvent is passed to it.

Hierarchy events are provided for notification purposes ONLY; The AWT will automatically handle changes to the hierarchy internally so that GUI layout, displayability, and visibility work properly regardless of whether a program registers a HierarchyListener or not.

Since:
1.3
See Also:

Method Summary

Modifier and Type Method Description
void hierarchyChanged(HierarchyEvent e)
Called when the hierarchy has been changed.

Method Details

hierarchyChanged

void hierarchyChanged(HierarchyEvent e)
Called when the hierarchy has been changed. To discern the actual type of change, call HierarchyEvent.getChangeFlags().
Parameters:
e - the event to be processed
See Also:

© 1993, 2023, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/event/HierarchyListener.html