coordtowin(3Tk)

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.


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


KEYWORDS
     containing, coordinates, root window