public interface ImageObserver
Modifier and Type | Field and Description |
---|---|
static int |
ABORT
This flag in the infoflags argument to imageUpdate indicates that
an image which was being tracked asynchronously was aborted before
production was complete.
|
static int |
ALLBITS
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.
|
static int |
ERROR
This flag in the infoflags argument to imageUpdate indicates that
an image which was being tracked asynchronously has encountered
an error.
|
static int |
FRAMEBITS
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.
|
static int |
HEIGHT
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.
|
static int |
PROPERTIES
This flag in the infoflags argument to imageUpdate indicates that
the properties of the image are now available.
|
static int |
SOMEBITS
This flag in the infoflags argument to imageUpdate indicates that
more pixels needed for drawing a scaled variation of the image
are available.
|
static int |
WIDTH
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.
|
Modifier and Type | Method and Description |
---|---|
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.
|
static final int WIDTH
static final int HEIGHT
static final int PROPERTIES
static final int SOMEBITS
static final int FRAMEBITS
static final int ALLBITS
static final int ERROR
static final int ABORT
boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height)
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
.
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.false
if the infoflags indicate that the
image is completely loaded; true
otherwise.WIDTH
,
HEIGHT
,
PROPERTIES
,
SOMEBITS
,
FRAMEBITS
,
ALLBITS
,
ERROR
,
ABORT
,
Image.getWidth(java.awt.image.ImageObserver)
,
Image.getHeight(java.awt.image.ImageObserver)
,
Graphics.drawImage(java.awt.Image, int, int, java.awt.image.ImageObserver)
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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