NAME

       tkwait - Wait for variable to change or window to be destroyed

SYNOPSIS

       tkwait variable name

       tkwait visibility name

       tkwait window name
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DESCRIPTION

       The  tkwait  command  waits  for  one of several things to happen, then it returns without
       taking any other actions.  The return value is always  an  empty  string.   If  the  first
       argument is variable (or any abbreviation of it) then the second argument is the name of a
       global variable and the command waits for that variable to  be  modified.   If  the  first
       argument is visibility (or any abbreviation of it) then the second argument is the name of
       a window and the tkwait command waits for a change in its visibility state  (as  indicated
       by  the  arrival  of a VisibilityNotify event).  This form is typically used to wait for a
       newly-created window to appear on the screen before taking  some  action.   If  the  first
       argument  is  window (or any abbreviation of it) then the second argument is the name of a
       window and the tkwait command waits for  that  window  to  be  destroyed.   This  form  is
       typically used to wait for a user to finish interacting with a dialog box before using the
       result of that interaction.

       While the tkwait command is waiting it processes events in  the  normal  fashion,  so  the
       application  will  continue  to respond to user interactions.  If an event handler invokes
       tkwait again, the nested call to tkwait must complete before the outer call can complete.

KEYWORDS

       variable, visibility, wait, window