Tk_ImageChanged (3)
notify widgets that image needs to be redrawn
SYNOPSIS
#include <tk.h>
Tk_ImageChanged(imageMaster, x, y, width, height, imageWidth, imageHeight)
ARGUMENTS
Tk_ImageMaster imageHeight
Tk_ImageMaster imageMaster in
Token for image, which was passed to image's createProc when
the image was created.
int x in
X-coordinate of upper-left corner of region that needs redisplay (measured
from upper-left corner of image).
int y in
Y-coordinate of upper-left corner of region that needs redisplay (measured
from upper-left corner of image).
"int" width in
Width of region that needs to be redrawn, in pixels.
"int" height in
Height of region that needs to be redrawn, in pixels.
"int" imageWidth in
Current width of image, in pixels.
"int" imageHeight in
Current height of image, in pixels.
DESCRIPTION
An image manager calls Tk_ImageChanged for an image
whenever anything happens that requires the image to be redrawn.
As a result of calling Tk_ImageChanged, any widgets using
the image are notified so that they can redisplay themselves
appropriately.
The imageMaster argument identifies the image, and
x, y, width, and height
specify a rectangular region within the image that needs to
be redrawn.
imageWidth and imageHeight specify the image's (new) size.
An image manager should call Tk_ImageChanged during
its createProc to specify the image's initial size and to
force redisplay if there are existing instances for the image.
If any of the pixel values in the image should change later on,
Tk_ImageChanged should be called again with x, y,
width, and height values that cover all the pixels
that changed.
If the size of the image should change, then Tk_ImageChanged
must be called to indicate the new size, even if no pixels
need to be redisplayed.
SEE ALSO
KEYWORDS
images, redisplay, image size changes
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