tkwait, a built-in Tk command, runs the event loop while waiting for something to happen (as described by its arguments).

See Also  edit

update considered harmful

On the hazards of entering the event loop.

vwait

Similar to tkwait variable.

Synopsis  edit

tkwait variable name

tkwait visibility name

tkwait window name

Description  edit

While the tkwait 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.

Global Scoping  edit

Another reminder to read the man page carefully: "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."

---