net.lucidviews.util.image
Class RepaintImageObserver

java.lang.Object
  net.lucidviews.util.image.BaseImageObserver
      net.lucidviews.util.image.RepaintImageObserver

All Implemented Interfaces:

ImageObserver

public class RepaintImageObserver
extends BaseImageObserver

An ImageObserver that repaints a component once the image has fully loaded.

Since:

1.0

Version:

$Revision: 1.4 $

Author:

Stephen Battey

See Also:

ImageObserver, Image

Nested Class Summary

Nested classes/interfaces inherited from class net.lucidviews.util.image.BaseImageObserver

BaseImageObserver.RespawnTimerTask

Field Summary

protected Component

_targetComponent The component to repaint once the image has loaded.

Fields inherited from class net.lucidviews.util.image.BaseImageObserver

_image, FORCE_RESPAWN_DELAY

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

RepaintImageObserver(Component targetComponent)
Create an observer that repaints the target component when the observed image has loaded.

RepaintImageObserver(Component targetComponent, Image image)
Create an observer that repaints the target component when the specified image has loaded.

Method Summary

boolean

observedImageUpdate(Image img, int infoflags, int x, int y, int width, int height) This method is called when information about the image that is being observed, and was previously requested using an asynchronous interface, becomes available.

Methods inherited from class net.lucidviews.util.image.BaseImageObserver

imageUpdate

Methods inherited from class java.lang.Object

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

Field Detail

_targetComponent

protected Component _targetComponent

The component to repaint once the image has loaded.

Constructor Detail

RepaintImageObserver

public RepaintImageObserver(Component targetComponent)

Create an observer that repaints the target component when the observed image has loaded.

Parameters:

targetComponent - the component to be refreshed

RepaintImageObserver

public RepaintImageObserver(Component targetComponent,
                            Image image)

Create an observer that repaints the target component when the specified image has loaded.
The extra image parameter restricts this observer such that it only repaints the target component when the specified image has loaded and not any other image it has been assigned to observe.

Parameters:

targetComponent - the component to be refreshed

image - the image that is to be monitored

Method Detail

observedImageUpdate

public boolean observedImageUpdate(Image img,
                                   int infoflags,
                                   int x,
                                   int y,
                                   int width,
                                   int height)

Description copied from class: BaseImageObserver

This method is called when information about the image that is being observed, and was previously requested using an asynchronous interface, becomes available.

This method should return true if further updates are needed or false if the required information has been acquired. The image which was being tracked is passed in using the img argument. Various constants are combined to form the infoflags argument which indicates what information about the image is now available. The interpretation of the x, y, width, and height arguments depends on the contents of the infoflags argument.

The infoflags argument should be the bitwise inclusive OR of the following flags: WIDTH, HEIGHT, PROPERTIES, SOMEBITS, FRAMEBITS, ALLBITS, ERROR, ABORT.

Specified by:

observedImageUpdate in class BaseImageObserver

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