WaitingImageObserver (libbase JavaDoc)

Class WaitingImageObserver

public class WaitingImageObserver extends Object implements ImageObserver

This image observer blocks until the image is completely loaded. AWT defers the loading of images until they are painted on a graphic.

While printing reports it is not very nice, not to know whether a image was completely loaded, so this observer forces the loading of the image until a final state (either ALLBITS, ABORT or ERROR) is reached.

Author: Thomas Morgner

Constructor Summary
	WaitingImageObserver(Image image) Creates a new `ImageObserver for the given Image.`

Constructor Summary

WaitingImageObserver(Image image)

Creates a new ImageObserver for the given Image.

Method Summary
boolean	imageUpdate(Image img, int infoflags, int x, int y, int width, int height) Callback function used by AWT to inform that more data is available.
boolean	isError() Returns true if there is an error condition, and false otherwise.
boolean	isLoadingComplete() Checks whether the loading is complete.
void	waitImageLoaded() The workerthread.

Method Summary

boolean

imageUpdate(Image img, int infoflags, int x, int y, int width, int height)

Callback function used by AWT to inform that more data is available.

boolean

isError()

Returns true if there is an error condition, and false otherwise.

boolean

isLoadingComplete()

Checks whether the loading is complete.

void

waitImageLoaded()

The workerthread.

Constructor Detail

public WaitingImageObserver(Image image)

Creates a new

ImageObserver for the given Image. The observer has to be started by an
 external thread.
Parameters: image the image to observe (null not permitted).






   Method Detail

   imageUpdate
   public  boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height)
   
 Callback function used by AWT to inform that more data is available. The observer waits until either all data is
 loaded or AWT signals that the image cannot be loaded.
Parameters: img       the image being observed. infoflags the bitwise inclusive OR of the following flags:  WIDTH, HEIGHT,
                  PROPERTIES, SOMEBITS, FRAMEBITS, ALLBITS,
                  ERROR, ABORT. x         the x coordinate. y         the y coordinate. width     the width. height    the height. 
Returns: false if the infoflags indicate that the image is completely loaded; true
         otherwise. 



   isError
   public  boolean isError()
   
 Returns true if there is an error condition, and false otherwise.
Returns: A boolean. 



   isLoadingComplete
   public  boolean isLoadingComplete()
   
 Checks whether the loading is complete.Returns: true, if the loading is complete, false otherwise. 



   waitImageLoaded
   public  void waitImageLoaded()
   
 The workerthread. Simply draws the image to a BufferedImage's Graphics-Object and waits for the AWT to load the
 image.

   
   
    
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