src/share/classes/java/awt/event/WindowFocusListener.java

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  30 /**
  31  * The listener interface for receiving <code>WindowEvents</code>, including
  32  * <code>WINDOW_GAINED_FOCUS</code> and <code>WINDOW_LOST_FOCUS</code> events.
  33  * The class that is interested in processing a <code>WindowEvent</code>
  34  * either implements this interface (and
  35  * all the methods it contains) or extends the abstract
  36  * <code>WindowAdapter</code> class (overriding only the methods of interest).
  37  * The listener object created from that class is then registered with a
  38  * <code>Window</code>
  39  * using the <code>Window</code>'s <code>addWindowFocusListener</code> method.
  40  * When the <code>Window</code>'s
  41  * status changes by virtue of it being opened, closed, activated, deactivated,
  42  * iconified, or deiconified, or by focus being transfered into or out of the
  43  * <code>Window</code>, the relevant method in the listener object is invoked,
  44  * and the <code>WindowEvent</code> is passed to it.
  45  *
  46  * @author David Mendenhall
  47  *
  48  * @see WindowAdapter
  49  * @see WindowEvent
  50  * @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/windowlistener.html">Tutorial: Writing a Window Listener</a>
  51  *
  52  * @since 1.4
  53  */
  54 public interface WindowFocusListener extends EventListener {
  55 
  56     /**
  57      * Invoked when the Window is set to be the focused Window, which means
  58      * that the Window, or one of its subcomponents, will receive keyboard
  59      * events.
  60      */
  61     public void windowGainedFocus(WindowEvent e);
  62 
  63     /**
  64      * Invoked when the Window is no longer the focused Window, which means
  65      * that keyboard events will no longer be delivered to the Window or any of
  66      * its subcomponents.
  67      */
  68     public void windowLostFocus(WindowEvent e);
  69 }


  30 /**
  31  * The listener interface for receiving <code>WindowEvents</code>, including
  32  * <code>WINDOW_GAINED_FOCUS</code> and <code>WINDOW_LOST_FOCUS</code> events.
  33  * The class that is interested in processing a <code>WindowEvent</code>
  34  * either implements this interface (and
  35  * all the methods it contains) or extends the abstract
  36  * <code>WindowAdapter</code> class (overriding only the methods of interest).
  37  * The listener object created from that class is then registered with a
  38  * <code>Window</code>
  39  * using the <code>Window</code>'s <code>addWindowFocusListener</code> method.
  40  * When the <code>Window</code>'s
  41  * status changes by virtue of it being opened, closed, activated, deactivated,
  42  * iconified, or deiconified, or by focus being transfered into or out of the
  43  * <code>Window</code>, the relevant method in the listener object is invoked,
  44  * and the <code>WindowEvent</code> is passed to it.
  45  *
  46  * @author David Mendenhall
  47  *
  48  * @see WindowAdapter
  49  * @see WindowEvent
  50  * @see <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/windowlistener.html">Tutorial: Writing a Window Listener</a>
  51  *
  52  * @since 1.4
  53  */
  54 public interface WindowFocusListener extends EventListener {
  55 
  56     /**
  57      * Invoked when the Window is set to be the focused Window, which means
  58      * that the Window, or one of its subcomponents, will receive keyboard
  59      * events.
  60      */
  61     public void windowGainedFocus(WindowEvent e);
  62 
  63     /**
  64      * Invoked when the Window is no longer the focused Window, which means
  65      * that keyboard events will no longer be delivered to the Window or any of
  66      * its subcomponents.
  67      */
  68     public void windowLostFocus(WindowEvent e);
  69 }