java.awt.event
Interface WindowFocusListener

All Superinterfaces:
EventListener sample code for java.util.EventListener definition code for java.util.EventListener
All Known Implementing Classes:
AWTEventMulticaster sample code for java.awt.AWTEventMulticaster definition code for java.awt.AWTEventMulticaster , BasicToolBarUI.FrameListener sample code for javax.swing.plaf.basic.BasicToolBarUI.FrameListener definition code for javax.swing.plaf.basic.BasicToolBarUI.FrameListener , JMenu.WinListener sample code for javax.swing.JMenu.WinListener definition code for javax.swing.JMenu.WinListener , WindowAdapter sample code for java.awt.event.WindowAdapter definition code for java.awt.event.WindowAdapter

public interface WindowFocusListener
extends EventListener sample code for java.util.EventListener definition code for java.util.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.

Since:
1.4
See Also:
WindowAdapter sample code for java.awt.event.WindowAdapter definition code for java.awt.event.WindowAdapter , WindowEvent sample code for java.awt.event.WindowEvent definition code for java.awt.event.WindowEvent , Tutorial: Writing a Window Listener, Reference: The Java Class Libraries (update file)

Method Summary
 void windowGainedFocus sample code for java.awt.event.WindowFocusListener.windowGainedFocus(java.awt.event.WindowEvent) definition code for java.awt.event.WindowFocusListener.windowGainedFocus(java.awt.event.WindowEvent) (WindowEvent sample code for java.awt.event.WindowEvent definition code for 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.
 void windowLostFocus sample code for java.awt.event.WindowFocusListener.windowLostFocus(java.awt.event.WindowEvent) definition code for java.awt.event.WindowFocusListener.windowLostFocus(java.awt.event.WindowEvent) (WindowEvent sample code for java.awt.event.WindowEvent definition code for 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.
 

Method Detail

windowGainedFocus sample code for java.awt.event.WindowFocusListener.windowGainedFocus(java.awt.event.WindowEvent) definition code for java.awt.event.WindowFocusListener.windowGainedFocus(java.awt.event.WindowEvent)

void windowGainedFocus(WindowEvent sample code for java.awt.event.WindowEvent definition code for 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.


windowLostFocus sample code for java.awt.event.WindowFocusListener.windowLostFocus(java.awt.event.WindowEvent) definition code for java.awt.event.WindowFocusListener.windowLostFocus(java.awt.event.WindowEvent)

void windowLostFocus(WindowEvent sample code for java.awt.event.WindowEvent definition code for 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.