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markom |
'\"
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'\" Copyright (c) 1994 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" RCS: @(#) $Id: ImgChanged.3,v 1.1.1.1 2002-01-16 10:25:48 markom Exp $
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'\"
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.so man.macros
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.TH Tk_ImageChanged 3 4.0 Tk "Tk Library Procedures"
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.BS
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.SH NAME
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Tk_ImageChanged \- notify widgets that image needs to be redrawn
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.SH SYNOPSIS
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.nf
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\fB#include \fR
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.sp
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\fBTk_ImageChanged\fR(\fIimageMaster, x, y, width, height, imageWidth, imageHeight\fR)
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.SH ARGUMENTS
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.AS Tk_ImageMaster imageHeight
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.AP Tk_ImageMaster imageMaster in
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Token for image, which was passed to image's \fIcreateProc\fR when
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the image was created.
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.AP int x in
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X-coordinate of upper-left corner of region that needs redisplay (measured
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from upper-left corner of image).
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.AP int y in
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Y-coordinate of upper-left corner of region that needs redisplay (measured
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from upper-left corner of image).
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.AP "int" width in
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Width of region that needs to be redrawn, in pixels.
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.AP "int" height in
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Height of region that needs to be redrawn, in pixels.
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.AP "int" imageWidth in
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Current width of image, in pixels.
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.AP "int" imageHeight in
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Current height of image, in pixels.
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.BE
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.SH DESCRIPTION
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.PP
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An image manager calls \fBTk_ImageChanged\fR for an image
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whenever anything happens that requires the image to be redrawn.
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As a result of calling \fBTk_ImageChanged\fR, any widgets using
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the image are notified so that they can redisplay themselves
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appropriately.
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The \fIimageMaster\fR argument identifies the image, and
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\fIx\fR, \fIy\fR, \fIwidth\fR, and \fIheight\fR
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specify a rectangular region within the image that needs to
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be redrawn.
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\fIimageWidth\fR and \fIimageHeight\fR specify the image's (new) size.
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.PP
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An image manager should call \fBTk_ImageChanged\fR during
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its \fIcreateProc\fR to specify the image's initial size and to
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force redisplay if there are existing instances for the image.
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If any of the pixel values in the image should change later on,
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\fBTk_ImageChanged\fR should be called again with \fIx\fR, \fIy\fR,
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\fIwidth\fR, and \fIheight\fR values that cover all the pixels
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that changed.
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If the size of the image should change, then \fBTk_ImageChanged\fR
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must be called to indicate the new size, even if no pixels
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need to be redisplayed.
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.SH "SEE ALSO"
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Tk_CreateImageType
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.SH KEYWORDS
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images, redisplay, image size changes
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