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'\" Copyright (c) 1990-1993 The Regents of the University of California.

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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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.so man.macros

.TH Tk_CoordsToWindow 3 "" Tk "Tk Library Procedures"

.BS

.SH NAME

Tk_CoordsToWindow \- Find window containing a point

.SH SYNOPSIS

.nf

\fB#include \fR

.sp

Tk_Window

\fBTk_CoordsToWindow\fR(\fIrootX, rootY, tkwin\fR)

.SH ARGUMENTS

.AS Tk_Window tkwin

.AP int rootX in

X-coordinate (in root window coordinates).

.AP int rootY in

Y-coordinate (in root window coordinates).

.AP Tk_Window tkwin in

Token for window that identifies application.

.BE

.SH DESCRIPTION

.PP

\fBTk_CoordsToWindow\fR locates the window that contains a given point.

The point is specified in root coordinates with \fIrootX\fR and

\fIrootY\fR (if a virtual-root window manager is in use then

\fIrootX\fR and \fIrootY\fR are in the coordinate system of the

virtual root window).

The return value from the procedure is a token for the window that

contains the given point.

If the point is not in any window, or if the containing window

is not in the same application as \fItkwin\fR, then NULL is

returned.

.PP

The containing window is decided using the same rules that determine

which window contains the mouse cursor:  if a parent and a child both

contain the point then the child gets preference, and if two siblings

both contain the point then the highest one in the stacking order

(i.e. the one that's visible on the screen) gets preference.

.SH KEYWORDS

containing, coordinates, root window