Allow Tcl events to be serviced or not

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Description

This function controls or reports on the Tcl service mode, i.e., whether Tcl will respond to events.

Usage

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Arguments

on

(logical) Whether event servicing is turned on.

Details

If called with on == NULL (the default), no change is made.

Note that this blocks all Tcl/Tk activity, including for widgets from other packages. It may be better to manage mapping of windows individually.

Value

The value of the Tcl service mode before the call.

Examples

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## see demo(tkcanvas) for an example
## Not run: 
oldmode <- tclServiceMode(FALSE)
# Do some work to create a nice picture.
# Nothing will be displayed until...
tclServiceMode(oldmode)

## End(Not run)
## another idea is to use tkwm.withdraw() ... tkwm.deiconify()