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.TH "XmObjectAtPoint" "library call"

.SH "NAME"

\fBXmObjectAtPoint\fP \(em A toolkit function that determines which child intersects or comes closest to a specified point

.iX "XmObjectAtPoint"

.SH "SYNOPSIS"

.PP

.nf

#include <Xm/Xm\&.h>

\fBWidget \fBXmObjectAtPoint\fP\fR(

\fBWidget \fBwidget\fR\fR,

\fBPosition \fBx\fR\fR,

\fBPosition \fBy\fR\fR);

.fi

.SH "DESCRIPTION"

.PP

\fBXmObjectAtPoint\fP searches the child list of the specified

manager \fIwidget\fP and returns the child most closely associated

with the specified \fIx\fP,\fIy\fP coordinate pair\&.

.PP

For the typical Motif manager \fIwidget\fP, \fBXmObjectAtPoint\fP

uses the following rules to determine the returned object:

.IP "   \(bu" 6

If one child intersects \fIx,y\fP, \fBXmObjectAtPoint\fP

returns the widget ID of that child\&.

.IP "   \(bu" 6

If more than one child intersects \fIx,y\fP,

\fBXmObjectAtPoint\fP returns the widget ID of the visible child\&.

.IP "   \(bu" 6

If no child intersects \fIx\fP,\fIy\fP, \fBXmObjectAtPoint\fP

returns NULL\&.

.PP

The preceding rules are only general\&. In fact, each manager

\fIwidget\fP is free to define "most closely associated"

as it desires\&.

For example, if no child intersects \fIx,y\fP, a manager

might return the child closest to \fIx,y\fP\&.

.IP "\fIwidget\fP" 10

Specifies a manager widget\&.

.IP "\fIx\fP" 10

Specifies the x-coordinate about which you are seeking child

information\&. The x-coordinate must be specified in pixels,

relative to the left side of \fImanager\fP\&.

.IP "\fIy\fP" 10

Specifies the y-coordinate about which you are seeking child

information\&. The y-coordinate must be specified in pixels,

relative to the top side of \fImanager\fP\&.

.SH "RETURN"

.PP

Returns the child of \fImanager\fP most closely associated

with \fIx,y\fP\&.

If none of its children are sufficiently associated with \fIx,y\fP,

returns NULL\&.

.SH "RELATED"

.PP

\fBXmManager\fP(3)\&.

...\" created by instant / docbook-to-man, Sun 22 Dec 1996, 20:27