java::awt::event::WindowFocusListener Class Reference

Inheritance diagram for java::awt::event::WindowFocusListener:

Inheritance graph
java::awt::event::WindowAdapterjava::util::EventListenerjava::lang::Interfacejava::lang::Object
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Collaboration diagram for java::awt::event::WindowFocusListener:

Collaboration graph
java::util::EventListenerjava::lang::Interfacejava::lang::Object
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List of all members.


Detailed Description

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:
1.5, 01/23/03
See also:
WindowAdapter

WindowEvent

Tutorial: Writing a Window Listener

Reference: The Java Class Libraries (update file)

Since:
1.4

Public Member Functions

virtual void windowGainedFocus (const WindowEvent &e)=0
 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.
virtual void windowLostFocus (const WindowEvent &e)=0
 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.

Member Function Documentation

virtual void java::awt::event::WindowFocusListener::windowGainedFocus ( const WindowEvent e  )  [pure virtual]

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.

Implemented in java::awt::event::WindowAdapter.

virtual void java::awt::event::WindowFocusListener::windowLostFocus ( const WindowEvent e  )  [pure virtual]

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.

Implemented in java::awt::event::WindowAdapter.


The documentation for this class was generated from the following file:
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