CentOS 7.0 - man page for tk_coordstowindow (centos section 3)
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Tk_CoordsToWindow(3) Tk Library Procedures Tk_CoordsToWindow(3)
Tk_CoordsToWindow - Find window containing a point
Tk_CoordsToWindow(rootX, rootY, tkwin)
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.
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.
containing, coordinates, root window
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