... XmObjectAtPoint - Online Linux Manual PageSection : library call

NAMEXmObjectAtPoint — A toolkit function that determines which child intersects or comes closest to a specified point .iX "XmObjectAtPoint"

SYNOPSIS#include <Xm/Xm​.h> Widget XmObjectAtPoint( Widget widget, Position x, Position y);

DESCRIPTIONXmObjectAtPoint searches the child list of the specified manager widget and returns the child most closely associated with the specified x,y coordinate pair​. For the typical Motif manager widget, XmObjectAtPoint uses the following rules to determine the returned object: • If one child intersects x,y, XmObjectAtPoint returns the widget ID of that child​. • If more than one child intersects x,y, XmObjectAtPoint returns the widget ID of the visible child​. • If no child intersects x,y, XmObjectAtPoint returns NULL​. The preceding rules are only general​. In fact, each manager widget is free to define "most closely associated" as it desires​. For example, if no child intersects x,y, a manager might return the child closest to x,y​. widget Specifies a manager widget​. x 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 manager​. y 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 manager​.

RETURNReturns the child of manager most closely associated with x,y​. If none of its children are sufficiently associated with x,y, returns NULL​.

RELATEDXmManager(3)​. ...
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