javax.swing
Class DebugGraphicsObserver

java.lang.Object
  javax.swing.DebugGraphicsObserver

All Implemented Interfaces:

ImageObserver

class DebugGraphicsObserver

extends Object

implements ImageObserver

ImageObserver for DebugGraphics, used for images only.

Author:

Dave Karlton

Field Summary

(package private) int

lastInfo

Fields inherited from interface java.awt.image.ImageObserver

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

Constructor Summary

(package private)

DebugGraphicsObserver()

Method Summary

(package private) boolean	allBitsPresent()
(package private) boolean	imageHasProblem()
boolean	imageUpdate(Image img, int infoflags, int x, int y, int width, int height) This method is called when information about an image which was previously requested using an asynchronous interface becomes available.

Methods inherited from class java.lang.Object

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

Field Detail

lastInfo

int lastInfo

Constructor Detail

DebugGraphicsObserver

DebugGraphicsObserver()

Method Detail

allBitsPresent

boolean allBitsPresent()

imageHasProblem

boolean imageHasProblem()

imageUpdate

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

Description copied from interface: ImageObserver

This method is called when information about an image which was previously requested using an asynchronous interface becomes available. Asynchronous interfaces are method calls such as getWidth(ImageObserver) and drawImage(img, x, y, ImageObserver) which take an ImageObserver object as an argument. Those methods register the caller as interested either in information about the overall image itself (in the case of getWidth(ImageObserver)) or about an output version of an image (in the case of the drawImage(img, x, y, [w, h,] ImageObserver) call).

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:

imageUpdate in interface ImageObserver

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.

See Also:

ImageObserver.WIDTH, ImageObserver.HEIGHT, ImageObserver.PROPERTIES, ImageObserver.SOMEBITS, ImageObserver.FRAMEBITS, ImageObserver.ALLBITS, ImageObserver.ERROR, ImageObserver.ABORT, Image.getWidth(java.awt.image.ImageObserver), Image.getHeight(java.awt.image.ImageObserver), Graphics.drawImage(java.awt.Image, int, int, java.awt.image.ImageObserver)