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Only maintain internal widget ID seed if the user has called setWidgetIdSeed() #423

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Only maintain internal widget ID seed if the user has called setWidgetIdSeed() #423

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17 changes: 12 additions & 5 deletions R/widgetid.R
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Original file line number Diff line number Diff line change
Expand Up @@ -25,19 +25,26 @@ createWidgetId <- function(bytes = 10) {

# Note what the system's random seed is before we start, so we can restore it after
sysSeed <- .GlobalEnv$.Random.seed
# Replace system seed with our own seed

if (!is.null(.globals$idSeed)) {
# Replace system seed with our own seed
.GlobalEnv$.Random.seed <- .globals$idSeed
on.exit({
# Continue using our own seed for subsequent widget ids
.globals$idSeed <- .GlobalEnv$.Random.seed
})
} else if (exists(".Random.seed", envir = .GlobalEnv)) {
# or remove the seed for a fresh RNG if we don't have an internal RNG state
rm(".Random.seed", envir = .GlobalEnv)
}

on.exit({
# Change our own seed to match the current seed
.globals$idSeed <- .GlobalEnv$.Random.seed
# Restore the system seed--we were never here
if(!is.null(sysSeed))
if (!is.null(sysSeed))
.GlobalEnv$.Random.seed <- sysSeed
else
rm(".Random.seed", envir = .GlobalEnv)
})
}, add = TRUE)

paste(
format(as.hexmode(sample(256, bytes, replace = TRUE)-1), width=2),
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