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tkwait(3tk) Tk Built-In Commands tkwait(3tk) 





NAME


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






SYNOPSIS


tkwait variable name
tkwait visibility name
tkwait window name








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.






SEE ALSO


bind(3tk), vwait(3tk)






KEYWORDS


variable, visibility, wait, window







  

    
    Tk