java.awt.event.FocusAdapter Maven / Gradle / Ivy
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This work corresponds to the API signatures of JSR 217: Personal Basis
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*/
package java.awt.event;
/**
* 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.
*
* @see FocusEvent
* @see FocusListener
* @see Tutorial: Writing a Focus Listener
* @see Reference: The Java Class Libraries (update file)
*
* @author Carl Quinn
* @version 1.15 01/23/03
* @since 1.1
*/
public abstract class FocusAdapter implements FocusListener
{
public FocusAdapter() { }
/**
* Invoked when a component gains the keyboard focus.
*/
public void focusGained(FocusEvent e) { }
/**
* Invoked when a component loses the keyboard focus.
*/
public void focusLost(FocusEvent e) { }
}