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CentOS 7.0 - man page for tk_coordstowindow (centos section 3)

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Tk_CoordsToWindow(3)		      Tk Library Procedures		     Tk_CoordsToWindow(3)

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NAME
       Tk_CoordsToWindow - Find window containing a point

SYNOPSIS
       #include <tk.h>

       Tk_Window
       Tk_CoordsToWindow(rootX, rootY, tkwin)

ARGUMENTS
       int rootX (in)		     X-coordinate (in root window coordinates).

       int rootY (in)		     Y-coordinate (in root window coordinates).

       Tk_Window tkwin (in)	     Token for window that identifies application.
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DESCRIPTION
       Tk_CoordsToWindow  locates the window that contains a given point.  The point is specified
       in root coordinates with rootX and rootY (if a virtual-root window manager is in use  then
       rootX  and  rootY  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
       tkwin, then NULL is returned.

       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  stack-
       ing order (i.e. the one that's visible on the screen) gets preference.

KEYWORDS
       containing, coordinates, root window

Tk									     Tk_CoordsToWindow(3)
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