Class FocusAdapter
- java.lang.Object
-
- java.awt.event.FocusAdapter
- All Implemented Interfaces:
-
FocusListener
,EventListener
- Direct Known Subclasses:
-
BasicSplitPaneUI.FocusHandler
,BasicTabbedPaneUI.FocusHandler
public abstract class FocusAdapter extends Object implements FocusListener
An abstract adapter class for receiving keyboard focus events. The methods in this class are empty. This class exists as convenience for creating listener objects.
Extend this class to create a FocusEvent
listener and override the methods for the events of interest. (If you implement the FocusListener
interface, you have to define all of the methods in it. This abstract class defines null methods for them all, so you can only have to define methods for events you care about.)
Create a listener object using the extended class and then register it with a component using the component's addFocusListener
method. When the component gains or loses the keyboard focus, the relevant method in the listener object is invoked, and the FocusEvent
is passed to it.
- Since:
- 1.1
- See Also:
-
FocusEvent
,FocusListener
, Tutorial: Writing a Focus Listener
Constructor Summary
Constructor | Description |
---|---|
FocusAdapter() |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
void | focusGained(FocusEvent e) | Invoked when a component gains the keyboard focus. |
void | focusLost(FocusEvent e) | Invoked when a component loses the keyboard focus. |
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Constructor Detail
FocusAdapter
public FocusAdapter()
Method Detail
focusGained
public void focusGained(FocusEvent e)
Invoked when a component gains the keyboard focus.
- Specified by:
-
focusGained
in interfaceFocusListener
- Parameters:
-
e
- the event to be processed
focusLost
public void focusLost(FocusEvent e)
Invoked when a component loses the keyboard focus.
- Specified by:
-
focusLost
in interfaceFocusListener
- Parameters:
-
e
- the event to be processed