java.awt.event.WindowFocusListener Maven / Gradle / Ivy

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*/


  


package java.awt.event;

import 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.
 *
 * @author David Mendenhall
 * @version 1.5, 01/23/03
 *
 * @see WindowAdapter
 * @see WindowEvent
 * @see Tutorial: Writing a Window Listener
 * @see Reference: The Java Class Libraries (update file)
 *
 * @since 1.4
 */
public interface WindowFocusListener extends EventListener
{

    /** 
     * 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 void windowGainedFocus(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.
     */
    public void windowLostFocus(WindowEvent e);
}