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#' Knitr S3 methods
#'
#' These S3 methods are necessary to help Shiny applications and UI chunks embed
#' themselves in knitr/rmarkdown documents.
#'
#' @name knitr_methods
#' @keywords internal
#' @param x Object to knit_print
#' @param ... Additional knit_print arguments
NULL
# If there's an R Markdown runtime option set but it isn't set to Shiny, then
# return a warning indicating the runtime is inappropriate for this object.
# Returns NULL in all other cases.
shiny_rmd_warning <- function() {
runtime <- knitr::opts_knit$get("rmarkdown.runtime")
if (!is.null(runtime) && runtime != "shiny")
# note that the RStudio IDE checks for this specific string to detect Shiny
# applications in static document
list(structure(
"Shiny application in a static R Markdown document",
class = "rmd_warning"))
else
NULL
}
#' @rdname knitr_methods
knit_print.shiny.appobj <- function(x, ...) {
opts <- x$options %||% list()
width <- if (is.null(opts$width)) "100%" else opts$width
height <- if (is.null(opts$height)) "400" else opts$height
runtime <- knitr::opts_knit$get("rmarkdown.runtime")
if (!is.null(runtime) && runtime != "shiny") {
# If not rendering to a Shiny document, create a box exactly the same
# dimensions as the Shiny app would have had (so the document continues to
# flow as it would have with the app), and display a diagnostic message
width <- validateCssUnit(width)
height <- validateCssUnit(height)
output <- tags$div(
style=paste("width:", width, "; height:", height, "; text-align: center;",
"box-sizing: border-box;", "-moz-box-sizing: border-box;",
"-webkit-box-sizing: border-box;"),
class="muted well",
"Shiny applications not supported in static R Markdown documents")
}
else {
path <- addSubApp(x)
output <- deferredIFrame(path, width, height)
}
# If embedded Shiny apps ever have JS/CSS dependencies (like pym.js) we'll
# need to grab those and put them in meta, like in knit_print.shiny.tag. But
# for now it's not an issue, so just return the HTML and warning.
knitr::asis_output(htmlPreserve(format(output, indent=FALSE)),
meta = shiny_rmd_warning(), cacheable = FALSE)
}
# Let us use a nicer syntax in knitr chunks than literally
# calling output$value <- renderFoo(...) and fooOutput().
#' @rdname knitr_methods
#' @param inline Whether the object is printed inline.
knit_print.shiny.render.function <- function(x, ..., inline = FALSE) {
x <- htmltools::as.tags(x, inline = inline)
output <- knitr::knit_print(tagList(x), ..., inline = inline)
attr(output, "knit_cacheable") <- FALSE
attr(output, "knit_meta") <- append(attr(output, "knit_meta"),
shiny_rmd_warning())
output
}
# Lets us drop reactive expressions directly into a knitr chunk and have the
# value printed out! Nice for teaching if nothing else.
#' @rdname knitr_methods
knit_print.reactive <- function(x, ..., inline = FALSE) {
renderFunc <- if (inline) renderText else renderPrint
knitr::knit_print(renderFunc({
x()
}), ..., inline = inline)
}
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