FocusListener
, EventListener
BasicSplitPaneUI.FocusHandler
, BasicTabbedPaneUI.FocusHandler
public abstract class FocusAdapter extends Object implements FocusListener
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.
Modifier | Constructor | Description |
---|---|---|
protected |
Constructs a FocusAdapter . |
Modifier and Type | Method | Description |
---|---|---|
void |
focusGained |
Invoked when a component gains the keyboard focus. |
void |
focusLost |
Invoked when a component loses the keyboard focus. |
protected FocusAdapter()
FocusAdapter
.public void focusGained(FocusEvent e)
focusGained
in interface FocusListener
e
- the event to be processedpublic void focusLost(FocusEvent e)
focusLost
in interface FocusListener
e
- the event to be processed
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/event/FocusAdapter.html