com.nwawsoft.util.ui

Class RequestFocusListener

java.lang.Object

com.nwawsoft.util.ui.RequestFocusListener

All Implemented Interfaces:

java.util.EventListener, javax.swing.event.AncestorListener

public class RequestFocusListener
extends java.lang.Object
implements javax.swing.event.AncestorListener

Original code by Rob Camick. Hosted at http://www.camick.com/java/source/RequestFocusListener.java Previous link found at https://tips4java.wordpress.com/2010/03/14/dialog-focus/ Previous link found at https://stackoverflow.com/questions/62821608/how-does-focus-on-jbuttons-actually-work-in-java Convenience class to request focus on a component. When the component is added to a realized Window then component will request focus immediately, since the ancestorAdded event is fired immediately. When the component is added to a non realized Window, then the focus request will be made once the window is realized, since the ancestorAdded event will not be fired until then. Using the default constructor will cause the listener to be removed from the component once the AncestorEvent is generated. A second constructor allows you to specify a boolean value of false to prevent the AncestorListener from being removed when the event is generated. This will allow you to reuse the listener each time the event is generated.

Constructor Summary

Constructors

Constructor and Description
RequestFocusListener() Convenience constructor.
RequestFocusListener(boolean removeListener) Constructor that controls whether this listen can be used once or multiple times.

Method Summary

Modifier and Type	Method and Description
void	ancestorAdded(javax.swing.event.AncestorEvent e)
void	ancestorMoved(javax.swing.event.AncestorEvent e)
void	ancestorRemoved(javax.swing.event.AncestorEvent e)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RequestFocusListener

public RequestFocusListener()

Convenience constructor. The listener is only used once and then it is removed from the component.

RequestFocusListener

public RequestFocusListener(boolean removeListener)

Constructor that controls whether this listen can be used once or multiple times.

Parameters:

removeListener - when true this listener is only invoked once otherwise it can be invoked multiple times.

Method Detail

ancestorAdded

public void ancestorAdded(javax.swing.event.AncestorEvent e)

Specified by:

ancestorAdded in interface javax.swing.event.AncestorListener

ancestorMoved

public void ancestorMoved(javax.swing.event.AncestorEvent e)

Specified by:

ancestorMoved in interface javax.swing.event.AncestorListener

ancestorRemoved

public void ancestorRemoved(javax.swing.event.AncestorEvent e)

Specified by:

ancestorRemoved in interface javax.swing.event.AncestorListener