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WindowFocusListener.javaAPI DocJava SE 5 API2062Fri Aug 26 14:56:50 BST 2005java.awt.event

WindowFocusListener

public interface WindowFocusListener implements EventListener
The listener interface for receiving WindowEvents, including WINDOW_GAINED_FOCUS and WINDOW_LOST_FOCUS events. The class that is interested in processing a WindowEvent either implements this interface (and all the methods it contains) or extends the abstract WindowAdapter class (overriding only the methods of interest). The listener object created from that class is then registered with a Window using the Window's addWindowFocusListener method. When the Window's status changes by virtue of it being opened, closed, activated, deactivated, iconified, or deiconified, or by focus being transfered into or out of the Window, the relevant method in the listener object is invoked, and the WindowEvent is passed to it.
author
David Mendenhall
version
1.6, 12/19/03
see
WindowAdapter
see
WindowEvent
see
Tutorial: Writing a Window Listener
see
Reference: The Java Class Libraries (update file)
since
1.4

Fields Summary
Constructors Summary
Methods Summary
public voidwindowGainedFocus(java.awt.event.WindowEvent e)
Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.

public voidwindowLostFocus(java.awt.event.WindowEvent e)
Invoked when the Window is no longer the focused Window, which means that keyboard events will no longer be delivered to the Window or any of its subcomponents.