Nothing
## package variable that holds references to callback functions
## such that they do not get erased
callbackFunctions <- new.env()
callbackFunctions$idle <- list()
#' @title Evaluate a function on once the processor is idle
#'
#' @description It is possible for an observer to call the configure method of
#' that plot while the plot is still in the configuration pipeline. In this
#' case, a warning is thrown as unwanted side effects can happen if the next
#' observer in line gets an outdated notification. In this case, it is
#' recommended to use the l_after_idle function that evaluates some code once
#' the processor is idle.
#'
#' @param fun function to be evaluated once tcl interpreter is idle
#'
#' @return NULL
#'
#' @export
l_after_idle <- function(fun) {
## save function from garbage collection
callback <- .Tcl.callback(fun)
hex <- unlist(strsplit(callback,' ', fixed=TRUE))[1]
callbackFunctions$idle[[hex]] <- fun
tcl('after', 'idle', callback)
## Todo, delete reference such that the garbage collector can
## delete function
invisible(NULL)
}
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