javax.swing.text.html
Class ImageView.ImageHandler

java.lang.Object
  javax.swing.text.html.ImageView.ImageHandler

All Implemented Interfaces:

ImageObserver

Enclosing class:

ImageView

private class ImageView.ImageHandler

extends Object

implements ImageObserver

ImageHandler implements the ImageObserver to correctly update the display as new parts of the image become available.

Field Summary

Fields inherited from interface java.awt.image.ImageObserver

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

Constructor Summary

private

ImageView.ImageHandler()

Method Summary

boolean

imageUpdate(Image img, int flags, int x, int y, int newWidth, int newHeight) 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

Constructor Detail

ImageView.ImageHandler

private ImageView.ImageHandler()

Method Detail

imageUpdate

public boolean imageUpdate(Image img,
                           int flags,
                           int x,
                           int y,
                           int newWidth,
                           int newHeight)

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.

flags - the bitwise inclusive OR of the following flags: WIDTH, HEIGHT, PROPERTIES, SOMEBITS, FRAMEBITS, ALLBITS, ERROR, ABORT.

x - the x coordinate.

y - the y coordinate.

newWidth - the width.

newHeight - 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)