nextapp.echo
Interface ImageReference

All Known Implementing Classes:

AbstractImageReference, AwtImageReference, EncodedImageReference, HttpImageReference, ResourceImageReference, StreamImageReference, TextImageReference, URLImageReference

public interface ImageReference

An interface used to describe a referenced image.

Field Summary

static int

SIZE_UNKNOWN The value getWidth() or getHeight() should return if that dimension of the image is not known.

Method Summary

void	addImageUpdateListener(ImageUpdateListener l) Adds an image update listener to the image reference.
int	getHeight() Returns the height of the image.
int	getWidth() Returns the width of the image.
void	removeImageUpdateListener(ImageUpdateListener l) Removes an image update listener to the image reference.
void	update() Notifies listeners that the referenced image has changed.

Field Detail

SIZE_UNKNOWN

static final int SIZE_UNKNOWN

The value getWidth() or getHeight() should return if that dimension of the image is not known.

See Also:

Constant Field Values

Method Detail

addImageUpdateListener

void addImageUpdateListener(ImageUpdateListener l)

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

Parameters:

l - The ImageUpdateListener to add.

getHeight

int getHeight()

Returns the height of the image. If the height is not known, SIZE_UNKNOWN should be returned.

Returns:

The height of the image in pixels.

getWidth

int getWidth()

Returns the width of the image. If the width is not known, SIZE_UNKNOWN should be returned.

Returns:

The width of the image in pixels.

removeImageUpdateListener

void removeImageUpdateListener(ImageUpdateListener l)

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

Parameters:

l - The ImageUpdateListener to remove.

update

void update()

Notifies listeners that the referenced image has changed.