R/shiny.R

In d3po: Fast and Beautiful Interactive Visualization for 'Markdown' and 'Shiny'

#' Shiny bindings for 'd3po'
#'
#' Output and render functions for using d3po within Shiny
#' applications and interactive Rmd documents.
#'
#' @param output_id output variable to read from
#' @param width,height Must be a valid CSS unit (like \code{'100\%'},
#'   \code{'400px'}, \code{'auto'}) or a number, which will be coerced to a
#'   string and have \code{'px'} appended.
#' @param expr An expression that generates a d3po object
#' @param env The environment in which to evaluate \code{expr}.
#' @param quoted Is \code{expr} a quoted expression (with \code{quote()})? This
#'   is useful if you want to save an expression in a variable.
#' @param id Id of plot to create a proxy of.
#' @param session A valid shiny session.
#
#' @name d3po-shiny
#'
#' @export
#' @return Creates a basic 'htmlwidget' object for 'Shiny' and interactive documents
d3po_output <- function(output_id, width = "100%", height = "400px") {
  htmlwidgets::shinyWidgetOutput(output_id, "d3po", width, height, package = "d3po")
}

#' @rdname d3po-shiny
#' @export
render_d3po <- function(expr, env = parent.frame(), quoted = FALSE) {
  if (!quoted) {
    expr <- substitute(expr)
  } # force quoted
  htmlwidgets::shinyRenderWidget(expr, d3po_output, env, quoted = TRUE)
}

#' @rdname d3po-shiny
#' @export
d3po_proxy <- function(id, session = shiny::getDefaultReactiveDomain()) {
  proxy <- list(id = id, session = session)
  class(proxy) <- "d3proxy"

  return(proxy)
}