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.
KEYWORDS¶
variable, visibility, wait, window