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# A scope where we can put mutable global state
.globals <- new.env(parent = emptyenv())
register_s3_method <- function(pkg, generic, class, fun = NULL) {
stopifnot(is.character(pkg), length(pkg) == 1)
stopifnot(is.character(generic), length(generic) == 1)
stopifnot(is.character(class), length(class) == 1)
if (is.null(fun)) {
fun <- get(paste0(generic, ".", class), envir = parent.frame())
} else {
stopifnot(is.function(fun))
}
if (pkg %in% loadedNamespaces()) {
registerS3method(generic, class, fun, envir = asNamespace(pkg))
}
# Always register hook in case pkg is loaded at some
# point the future (or, potentially, but less commonly,
# unloaded & reloaded)
setHook(
packageEvent(pkg, "onLoad"),
function(...) {
registerS3method(generic, class, fun, envir = asNamespace(pkg))
}
)
}
register_upgrade_message <- function(pkg, version) {
msg <- sprintf(
"This version of Shiny is designed to work with '%s' >= %s.
Please upgrade via install.packages('%s').",
pkg, version, pkg
)
if (pkg %in% loadedNamespaces() && !is_available(pkg, version)) {
packageStartupMessage(msg)
}
# Always register hook in case pkg is loaded at some
# point the future (or, potentially, but less commonly,
# unloaded & reloaded)
setHook(
packageEvent(pkg, "onLoad"),
function(...) {
if (!is_available(pkg, version)) packageStartupMessage(msg)
}
)
}
.onLoad <- function(libname, pkgname) {
# R's lazy-loading package scheme causes the private seed to be cached in the
# package itself, making our PRNG completely deterministic. This line resets
# the private seed during load.
withPrivateSeed(set.seed(NULL))
# Make sure these methods are available to knitr if shiny is loaded but not
# attached.
register_s3_method("knitr", "knit_print", "reactive")
register_s3_method("knitr", "knit_print", "shiny.appobj")
register_s3_method("knitr", "knit_print", "shiny.render.function")
# Shiny 1.4.0 bumps jQuery 1.x to 3.x, which caused a problem
# with static-rendering of htmlwidgets, and htmlwidgets 1.5
# includes a fix for this problem
# https://github.com/rstudio/shiny/issues/2630
register_upgrade_message("htmlwidgets", 1.5)
}
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