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tk_grab

Tk_Grab(3tk)						       Tk Library Procedures						      Tk_Grab(3tk)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_Grab, Tk_Ungrab - manipulate grab state in an application

SYNOPSIS

       #include <tk.h>

       int
       Tk_Grab(interp, tkwin, grabGlobal)

       void
       Tk_Ungrab(tkwin)

ARGUMENTS

       Tcl_Interp *interp (in)			 Interpreter to use for error reporting

       Tk_Window tkwin (in)			 Window on whose behalf the pointer is to be grabbed or released

       int grabGlobal (in)			 Boolean indicating whether the grab is global or application local
_________________________________________________________________

DESCRIPTION

       These  functions are used to set or release a global or application local grab.	When a grab is set on a particular window in a Tk applica-
       tion, mouse and keyboard events can only be received by that window and its descendants.  Mouse and keyboard events for windows outside the
       tree  rooted  at tkwin will be redirected to tkwin.  If the grab is global, then all mouse and keyboard events for windows outside the tree
       rooted at tkwin (even those intended for windows in other applications) will be redirected to tkwin.  If the  grab  is  application  local,
       only  mouse  and  keyboard  events  intended for a windows within the same application (but outside the tree rooted at tkwin) will be redi-
       rected.

       Tk_Grab sets a grab on a particular window.  Tkwin specifies the window on whose behalf the pointer is to be grabbed.  GrabGlobal indicates
       whether	the  grab should be global or application local; if it is non-zero, it means the grab should be global.  Normally, Tk_Grab returns
       TCL_OK; if an error occurs and the grab cannot be set, TCL_ERROR is returned and an error message is left if interp's  result.	Once  this
       call  completes	successfully,  no  window outside the tree rooted at tkwin will receive pointer- or keyboard-related events until the next
       call to Tk_Ungrab.  If a previous grab was in effect within the application, then it is replaced with a new one.

       Tcl_Ungrab releases a grab on the mouse pointer and keyboard, if there is one set on the window given by tkwin.	Once a grab  is  released,
       pointer and keyboard events will start being delivered to other windows again.

KEYWORDS

       grab, window

Tk																      Tk_Grab(3tk)