#' Add a flag
#'
#' Add a flag icon
#'
#' @param flag \href{https://www.iso.org/obp/ui/#search/code/}{ISO 3166-1-alpha-2} code of a country, see examples.
#' @param squared if \code{TRUE} will use square flag.
#' @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 elementId id of \code{<span>} (optional).
#'
#' @examples
#' flagr("be") # belgian flag
#' flagr("gr") # greek flag
#' flagr("us", width = 100, height = 60) # us flag
#' flagr("ch", squared = TRUE) # swiss flag squared
#'
#' @details flag-icon css \href{http://flag-icon-css.lip.is/}{demo}.
#'
#' @seealso flag-icons css \href{http://flag-icon-css.lip.is/}{demo}, on
#' \href{https://github.com/lipis/flag-icon-css}{github}
#'
#' @import htmlwidgets
#'
#' @export
flagr <- function(flag, squared = FALSE, width = NULL, height = NULL, elementId = NULL) {
if(missing(flag)) stop("Missing flag", call. = FALSE)
# forward options using x
x = list(
flag = flag,
squared = squared
)
# create widget
htmlwidgets::createWidget(
name = 'flagr',
x,
width = width,
height = height,
package = 'flagr',
elementId = elementId,
sizingPolicy = htmlwidgets::sizingPolicy(
defaultWidth = 60,
defaultHeight = 40,
viewer.fill = FALSE
)
)
}
flagr_html <- function(id, style, class, ...){
htmltools::tags$span(id = id, class = paste0("flag-icon ", class))
}
#' Shiny bindings for flagr
#'
#' Output and render functions for using flagr within Shiny
#' applications and interactive Rmd documents.
#'
#' @param outputId 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 flagr
#' @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.
#'
#' @name flagr-shiny
#'
#' @export
flagrOutput <- function(outputId, width = '100%', height = '400px'){
htmlwidgets::shinyWidgetOutput(outputId, 'flagr', width, height, package = 'flagr')
}
#' @rdname flagr-shiny
#' @export
renderFlagr <- function(expr, env = parent.frame(), quoted = FALSE) {
if (!quoted) { expr <- substitute(expr) } # force quoted
htmlwidgets::shinyRenderWidget(expr, flagrOutput, env, quoted = TRUE)
}
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