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markom |
'\"
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'\" Copyright (c) 1990-1993 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: CoordToWin.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_CoordsToWindow 3 "" Tk "Tk Library Procedures"
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.BS
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.SH NAME
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Tk_CoordsToWindow \- Find window containing a point
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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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Tk_Window
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\fBTk_CoordsToWindow\fR(\fIrootX, rootY, tkwin\fR)
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.SH ARGUMENTS
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.AS Tk_Window tkwin
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.AP int rootX in
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X-coordinate (in root window coordinates).
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.AP int rootY in
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Y-coordinate (in root window coordinates).
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.AP Tk_Window tkwin in
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Token for window that identifies application.
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.BE
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.SH DESCRIPTION
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.PP
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\fBTk_CoordsToWindow\fR locates the window that contains a given point.
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The point is specified in root coordinates with \fIrootX\fR and
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\fIrootY\fR (if a virtual-root window manager is in use then
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\fIrootX\fR and \fIrootY\fR are in the coordinate system of the
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virtual root window).
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The return value from the procedure is a token for the window that
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contains the given point.
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If the point is not in any window, or if the containing window
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is not in the same application as \fItkwin\fR, then NULL is
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returned.
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.PP
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The containing window is decided using the same rules that determine
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which window contains the mouse cursor: if a parent and a child both
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contain the point then the child gets preference, and if two siblings
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both contain the point then the highest one in the stacking order
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(i.e. the one that's visible on the screen) gets preference.
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.SH KEYWORDS
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containing, coordinates, root window
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