org.jfree.util

Class WaitingImageObserver

public class WaitingImageObserver extends Object implements ImageObserver, Serializable, Cloneable

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.`

Method Summary
Object	clone() Clones this WaitingImageObserver.
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() Returns `true` if loading is complete, and `false` otherwise.
void	waitImageLoaded() The workerthread.

Constructor Detail

WaitingImageObserver

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

   clone
   public  Object clone()
   Deprecated: cloning may lock down the observer 

 Clones this WaitingImageObserver.
Returns: a clone.
 
Throws: CloneNotSupportedException this should never happen. 



   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()
   
 Returns true if loading is complete, and false
 otherwise.
Returns: A boolean. 



   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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