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#' ggplot2 helpers
#'
#' Add \code{scale_fill_selection()} or \code{scale_color_selection} to a ggplot
#' to customize the scale for fill or color, respectively, for linked brushing.
#' Use \code{selection_factor} to turn logical vectors representing selection,
#' to a factor with the levels ordered for use with ggplot2 bar stacking.
#'
#' @param color_false The color that should be mapped to unselected rows
#' @param color_true The color that should be mapped to selected rows
#'
#' @examples
#' \dontrun{
#' sd <- SharedData$new(iris)
#' renderPlot({
#' df <- sd$data(withSelection = TRUE, withFilter = TRUE)
#' ggplot(df, aes(Sepal.Length, Sepal.Width,
#' color = selection_factor(df))) +
#' geom_point() +
#' scale_color_selection("#444444", "skyblue1")
#' })
#'
#' }
#' @export
scale_fill_selection <- function(color_false, color_true) {
list(
ggplot2::scale_fill_manual(values = c("TRUE" = color_true, "FALSE" = color_false)),
ggplot2::guides(fill = FALSE)
)
}
#' @rdname scale_fill_selection
#' @export
scale_color_selection <- function(color_false, color_true) {
list(
ggplot2::scale_color_manual(values = c("TRUE" = color_true, "FALSE" = color_false)),
ggplot2::guides(colour = FALSE)
)
}
#' @param x Either a data frame with a \code{selected_} column, or, a logical
#' vector indicating which rows are selected
#' @param na.replace The value to use to replace \code{NA} values; choose either
#' \code{FALSE}, \code{NA}, or \code{TRUE} based on how you want values to be
#' treated when no selection is active
#' @rdname scale_fill_selection
#' @export
selection_factor <- function(x, na.replace = c(FALSE, NA, TRUE)) {
if (missing(na.replace))
na.replace <- FALSE
selection <- if (is.logical(x)) {
x
} else {
x$selected_
}
selection[is.na(selection)] <- na.replace
factor(selection, ordered = TRUE, levels = c(TRUE, FALSE))
}
#' Synchronize Shiny brush selection with shared data
#'
#' Waits for a brush to change, and propagates that change to the
#' \code{sharedData} object.
#'
#' @param sharedData The shared data instance
#' @param brushId Character vector indicating the name of the \code{plotOutput}
#' brush
#' @param ownerId (TBD)
#'
#' @export
maintain_selection <- function(sharedData, brushId, ownerId = "") {
force(sharedData)
force(brushId)
session <- shiny::getDefaultReactiveDomain()
observeEvent(session$input[[brushId]], {
df <- sharedData$data(withKey = TRUE, withFilter = TRUE)
df <- shiny::brushedPoints(df, session$input[[brushId]])
sharedData$selection(df$key_, ownerId)
}, ignoreNULL = FALSE)
}
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