examples/colorPicker.R

In dreamRs/esquisse: Explore and Visualize Your Data Interactively

# colorPicker -------------------------------------------------------------

library(shiny)
library(esquisse)
library(scales)


ui <- fluidPage(
  tags$h2("colorPicker examples"),
  fluidRow(
    column(
      width = 3,
      colorPicker(
        inputId = "col1",
        label = "With a vector of colors:",
        choices = brewer_pal(palette = "Dark2")(8)
      ),
      verbatimTextOutput("res1"),
      colorPicker(
        inputId = "col5",
        label = "Update colors:",
        choices = brewer_pal(palette = "Blues", direction = -1)(8),
        textColor = "#FFF"
      ),
      verbatimTextOutput("res5"),
      radioButtons(
        "update", "Colors", c("Blues", "Greens", "Reds"),
        inline = TRUE
      )
    ),
    column(
      width = 3,
      colorPicker(
        inputId = "col2",
        label = "Change text color:",
        choices = brewer_pal(palette = "Blues")(8), 
        textColor = c("black", "black", "black", "white",
                      "white", "white", "white", "white")
      ),
      verbatimTextOutput("res2")
    ),
    column(
      width = 3,
      colorPicker(
        inputId = "col3",
        label = "With a list of vector of colors:",
        choices = list(
          "Blues" = brewer_pal(palette = "Blues")(8),
          "Reds" = brewer_pal(palette = "Reds")(8),
          "Greens" = brewer_pal(palette = "Greens")(8)
        )
      ),
      verbatimTextOutput("res3")
    ),
    column(
      width = 3,
      colorPicker(
        inputId = "col4",
        label = "Plain color & multiple choices:",
        choices = brewer_pal(palette = "Paired")(8), 
        plainColor = TRUE, 
        multiple = TRUE, 
        pickerOpts = list(`selected-text-format`= "count > 3")
      ),
      verbatimTextOutput("res4")
    )
  )
)

server <- function(input, output, session) {
  
  output$res1 <- renderPrint(input$col1)
  output$res2 <- renderPrint(input$col2)
  output$res3 <- renderPrint(input$col3)
  output$res4 <- renderPrint(input$col4)
  output$res5 <- renderPrint(input$col5)
  
  observeEvent(input$update, {
    updateColorPicker(
      inputId = "col5",
      choices = brewer_pal(palette = input$update, direction = -1)(8),
      textColor = "#FFF"
    )
  })
  
}

if (interactive()) {
  shinyApp(ui, server)
}