25
26 package java.awt.event;
27
28 import java.util.EventListener;
29
30 /**
31 * The listener interface for receiving keyboard focus events on
32 * a component.
33 * The class that is interested in processing a focus event
34 * either implements this interface (and all the methods it
35 * contains) or extends the abstract <code>FocusAdapter</code> class
36 * (overriding only the methods of interest).
37 * The listener object created from that class is then registered with a
38 * component using the component's <code>addFocusListener</code>
39 * method. When the component gains or loses the keyboard focus,
40 * the relevant method in the listener object
41 * is invoked, and the <code>FocusEvent</code> is passed to it.
42 *
43 * @see FocusAdapter
44 * @see FocusEvent
45 * @see <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/focuslistener.html">Tutorial: Writing a Focus Listener</a>
46 *
47 * @author Carl Quinn
48 * @since 1.1
49 */
50 public interface FocusListener extends EventListener {
51
52 /**
53 * Invoked when a component gains the keyboard focus.
54 */
55 public void focusGained(FocusEvent e);
56
57 /**
58 * Invoked when a component loses the keyboard focus.
59 */
60 public void focusLost(FocusEvent e);
61 }
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25
26 package java.awt.event;
27
28 import java.util.EventListener;
29
30 /**
31 * The listener interface for receiving keyboard focus events on
32 * a component.
33 * The class that is interested in processing a focus event
34 * either implements this interface (and all the methods it
35 * contains) or extends the abstract <code>FocusAdapter</code> class
36 * (overriding only the methods of interest).
37 * The listener object created from that class is then registered with a
38 * component using the component's <code>addFocusListener</code>
39 * method. When the component gains or loses the keyboard focus,
40 * the relevant method in the listener object
41 * is invoked, and the <code>FocusEvent</code> is passed to it.
42 *
43 * @see FocusAdapter
44 * @see FocusEvent
45 * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/focuslistener.html">Tutorial: Writing a Focus Listener</a>
46 *
47 * @author Carl Quinn
48 * @since 1.1
49 */
50 public interface FocusListener extends EventListener {
51
52 /**
53 * Invoked when a component gains the keyboard focus.
54 */
55 public void focusGained(FocusEvent e);
56
57 /**
58 * Invoked when a component loses the keyboard focus.
59 */
60 public void focusLost(FocusEvent e);
61 }
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