nextapp.echo
Class AbstractImageReference

java.lang.Object
  nextapp.echo.AbstractImageReference

All Implemented Interfaces:

ImageReference, java.io.Serializable

Direct Known Subclasses:

AwtImageReference, StreamImageReference

public abstract class AbstractImageReference

extends java.lang.Object

implements ImageReference, java.io.Serializable

A base class from which ImageReferences which render images from binary streams are derived.

See Also:

Serialized Form

Field Summary

protected EventListenerList

listenerList A storage facility for EventListeners.

Fields inherited from interface nextapp.echo.ImageReference

SIZE_UNKNOWN

Constructor Summary

AbstractImageReference()
Default constructor.

Method Summary

void	addImageUpdateListener(ImageUpdateListener l) Adds an image update listener to the image reference.
void	removeImageUpdateListener(ImageUpdateListener l) Removes an image update listener to the image reference.
void	update() Notifies listeners that the referenced image has changed.

Methods inherited from class java.lang.Object

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

Methods inherited from interface nextapp.echo.ImageReference

getHeight, getWidth

Field Detail

listenerList

protected EventListenerList listenerList

A storage facility for EventListeners. This EventListenerList is lazy-created, so it may be null if no ImageUpdateListeners have yet been registered.

Constructor Detail

AbstractImageReference

public AbstractImageReference()

Default constructor.

Method Detail

addImageUpdateListener

public void addImageUpdateListener(ImageUpdateListener l)

Description copied from interface: ImageReference

Adds an image update listener to the image reference. An image update listener will be notified of any changes to the image.

Specified by:

addImageUpdateListener in interface ImageReference

Parameters:

l - The ImageUpdateListener to add.

See Also:

ImageReference.addImageUpdateListener(ImageUpdateListener)

removeImageUpdateListener

public void removeImageUpdateListener(ImageUpdateListener l)

Description copied from interface: ImageReference

Removes an image update listener to the image reference. An image update listener will be notified of any changes to the image.

Specified by:

removeImageUpdateListener in interface ImageReference

Parameters:

l - The ImageUpdateListener to remove.

See Also:

ImageReference.removeImageUpdateListener(ImageUpdateListener)

update

public void update()

Description copied from interface: ImageReference

Notifies listeners that the referenced image has changed.

Specified by:

update in interface ImageReference

See Also:

ImageReference.update()