ImageObserver JDK 1.6)

Methods

public 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.

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.
Returns: false if the infoflags indicate that the image is completely loaded; true otherwise.
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.
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),

Fields

Hide/Show inherited fields

publicfinalstatic int ABORT = "128"

This flag in the infoflags argument to imageUpdate indicates that an image which was being tracked asynchronously was aborted before production was complete.

publicfinalstatic int ALLBITS = "32"

This flag in the infoflags argument to imageUpdate indicates that a static image which was previously drawn is now complete and can be drawn again in its final form.

publicfinalstatic int ERROR = "64"

This flag in the infoflags argument to imageUpdate indicates that an image which was being tracked asynchronously has encountered an error.

publicfinalstatic int FRAMEBITS = "16"

This flag in the infoflags argument to imageUpdate indicates that another complete frame of a multi-frame image which was previously drawn is now available to be drawn again.

publicfinalstatic int HEIGHT = "2"

This flag in the infoflags argument to imageUpdate indicates that the height of the base image is now available and can be taken from the height argument to the imageUpdate callback method.

publicfinalstatic int PROPERTIES = "4"

This flag in the infoflags argument to imageUpdate indicates that the properties of the image are now available.

publicfinalstatic int SOMEBITS = "8"

This flag in the infoflags argument to imageUpdate indicates that more pixels needed for drawing a scaled variation of the image are available.

publicfinalstatic int WIDTH = "1"

This flag in the infoflags argument to imageUpdate indicates that the width of the base image is now available and can be taken from the width argument to the imageUpdate callback method.