org.apache.wicket.extensions.markup.html.image.resource
Class ThumbnailImageResource

java.lang.Object
  org.apache.wicket.Resource
      org.apache.wicket.markup.html.WebResource
          org.apache.wicket.markup.html.DynamicWebResource
              org.apache.wicket.markup.html.image.resource.DynamicImageResource
                  org.apache.wicket.extensions.markup.html.image.resource.ThumbnailImageResource

All Implemented Interfaces:

Serializable, IClusterable, IRequestListener, IResourceListener

public class ThumbnailImageResource
extends DynamicImageResource

Image resource that dynamically scales the given original resource to a thumbnail. It is scaled either using the given maxSize as width or height, depending on its shape. If both the width and height are less than maxSize, no scaling is performed.

Author:

Eelco Hillenius

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.wicket.markup.html.DynamicWebResource

DynamicWebResource.ResourceState

Field Summary

Fields inherited from interface org.apache.wicket.IResourceListener

INTERFACE

Constructor Summary

ThumbnailImageResource(WebResource unscaledImageResource, int maxSize)
Construct.

Method Summary

protected byte[]	getImageData() Get image data for our dynamic image resource.
protected BufferedImage	getScaledImageInstance() get resized image instance.
void	invalidate() Sets any loaded resource to null, thus forcing a reload on the next request.
void	setScaleHints(int scaleHints) Sets hint(s) for the scale operation.

Methods inherited from class org.apache.wicket.markup.html.image.resource.DynamicImageResource

getFormat, getResourceState, setFormat, setLastModifiedTime, toImageData

Methods inherited from class org.apache.wicket.markup.html.DynamicWebResource

getLocale, getResourceStream, setHeaders

Methods inherited from class org.apache.wicket.markup.html.WebResource

configureResponse, getCacheDuration

Methods inherited from class org.apache.wicket.Resource

getParameters, isCacheable, onResourceRequested, setCacheable, setParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

ThumbnailImageResource

public ThumbnailImageResource(WebResource unscaledImageResource,
                              int maxSize)

Construct.

Parameters:

unscaledImageResource - the unscaled, original image resource. Must be not null

maxSize - maximum size (width or height) for resize operation

Method Detail

getImageData

protected byte[] getImageData()

Description copied from class: DynamicImageResource

Get image data for our dynamic image resource. If the subclass regenerates the data, it should set the lastModifiedTime when it does so. This ensures that image caching works correctly.

Specified by:

getImageData in class DynamicImageResource

Returns:

The image data for this dynamic image

getScaledImageInstance

protected final BufferedImage getScaledImageInstance()

get resized image instance.

Returns:

BufferedImage

setScaleHints

public final void setScaleHints(int scaleHints)

Sets hint(s) for the scale operation.

Parameters:

scaleHints - hint(s) for the scale operation

invalidate

public void invalidate()

Description copied from class: Resource

Sets any loaded resource to null, thus forcing a reload on the next request.

Overrides:

invalidate in class Resource

See Also:

Resource.invalidate()