creamtec.webcream.rendering.html
Class SnapshotRenderer

java.lang.Object
  creamtec.webcream.rendering.html.AbstractHTMLComponentRenderer
      creamtec.webcream.rendering.html.SnapshotRenderer

All Implemented Interfaces:

ComponentRenderer, HTMLComponentRenderer, java.util.Observer

public class SnapshotRenderer
extends AbstractHTMLComponentRenderer
implements java.util.Observer

Generates an image and makes the component draw itself into it. The image is then saved in a temporary directory and a link is added to it on the HTML page.

Constructor Summary

SnapshotRenderer()

Method Summary

java.awt.image.BufferedImage	generateIconImage(HTMLPage page, java.awt.Component comp, javax.swing.Icon icon) Generate and return the snapshot image of the icon
java.awt.image.BufferedImage	generateImage(HTMLPage page, java.awt.Component comp) Generate and return the snapshot image of the component
java.lang.String	generateImageFile(HTMLPage page, java.awt.image.BufferedImage image)
void	renderComponent(HTMLPage page, java.lang.Object component) Generates an image and makes the component draw itself into it.
void	update(java.util.Observable o, java.lang.Object arg) Called when the page is being cleared, so clean up generated images
void	writeJpegImage(HTMLPage page, java.lang.String fileName, java.awt.image.BufferedImage image) Persist the image into the file on disk

Methods inherited from class creamtec.webcream.rendering.html.AbstractHTMLComponentRenderer

renderComponent

Methods inherited from class java.lang.Object

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

Constructor Detail

SnapshotRenderer

public SnapshotRenderer()

Method Detail

renderComponent

public void renderComponent(HTMLPage page,
                            java.lang.Object component)
                     throws java.lang.Exception

Generates an image and makes the component draw itself into it. The image is then saved in a temporary directory and a link is added to it on the HTML page. If the component is rendered enabled, a mouse listener is added in JavaScript which submits the page whenever a user clicks on the image.

Specified by:

renderComponent in interface HTMLComponentRenderer

Specified by:

renderComponent in class AbstractHTMLComponentRenderer

Parameters:

page - HTMLPage

component - Object

Throws:

java.lang.Exception

generateImageFile

public java.lang.String generateImageFile(HTMLPage page,
                                          java.awt.image.BufferedImage image)
                                   throws java.lang.Exception

Throws:

java.lang.Exception

generateImage

public java.awt.image.BufferedImage generateImage(HTMLPage page,
                                                  java.awt.Component comp)
                                           throws WebCreamException

Generate and return the snapshot image of the component

Throws:

WebCreamException

generateIconImage

public java.awt.image.BufferedImage generateIconImage(HTMLPage page,
                                                      java.awt.Component comp,
                                                      javax.swing.Icon icon)
                                               throws WebCreamException

Generate and return the snapshot image of the icon

Throws:

WebCreamException

writeJpegImage

public void writeJpegImage(HTMLPage page,
                           java.lang.String fileName,
                           java.awt.image.BufferedImage image)
                    throws java.lang.Exception

Persist the image into the file on disk

Throws:

java.lang.Exception

update

public void update(java.util.Observable o,
                   java.lang.Object arg)

Called when the page is being cleared, so clean up generated images

Specified by:

update in interface java.util.Observer