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ActiveTcl User Guide |
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tkwait - Wait for variable to change or window to be destroyed
tkwait variable name
tkwait visibility name
tkwait window name
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.
variable, visibility, wait, window
Copyright © 1992 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.