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colourPickerBrowser.R
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colourPickerBrowser.R
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library(shiny)
library(miniUI)
colourPicker <- function(numCols = 3) {
colourPickerGadget(numCols)
}
colourPickerGadget <- function(numCols = 3) {
shiny::addResourcePath("cpg", system.file("gadgets", "colourpicker", package = "colourpicker"))
ui <- miniPage(
shinyjs::useShinyjs(),
shinyjs::extendShinyjs(
script = file.path("cpg", "js", "shinyjs-funcs.js"),
functions = c()
),
tags$head(
tags$link(rel="stylesheet", href = file.path("cpg", "css", "app.css")),
),
gadgetTitleBar(
span(strong("Colour Picker"),
span(id = "author", "By",
a(href = "https://deanattali.com", "Dean Attali")))
),
# Header section - shows the selected colours
div(
id = "header-section",
div(
id = "header-title",
"Selected colours"
),
div(
id = "selected-cols-row",
div(id = "addColBtn",
icon("plus"),
title = "Add another colour"
),
div(id = "removeColBtn",
icon("trash-alt"),
title = "Remove selected colour"
),
uiOutput("selectedCols", inline = TRUE)
),
checkboxInput(
"returnTypeName",
"Return colour name (eg. \"white\") instead of HEX value (eg. #FFFFFF) when possible",
width = "100%"
),
actionLink("showShortcuts", "Show keyboard shortcuts")
),
miniTabstripPanel(
# Tab 1 - choose any colour
miniTabPanel(
"Any colour",
icon = icon("globe"),
miniContentPanel(
div(
id = "anycolarea",
br(),
colourpicker::colourInput(
"anyColInput", "Select any colour", showColour = "both",
value = "white", allowTransparent = TRUE)
)
)
),
# Tab 2 - choose an R colour similar to a colour you choose
miniTabPanel(
"Find R colour",
icon = icon("search"),
miniContentPanel(
fluidRow(
column(
6,
colourpicker::colourInput(
"rclosecolInput", "Show R colours similar to this colour",
showColour = "both", value = "orange")
),
column(
6,
div(id = "customSliderContainer",
sliderInput("numSimilar", "How many colours to show",
min = 1, max = 40, value = 8, step = 1)
)
)
),
br(),
strong("Click a colour to select it"),
uiOutput("rclosecolsSection")
)
),
# Tab 3 - choose any R colour
miniTabPanel(
"All R colours",
icon = icon("paint-brush"),
miniContentPanel(
strong("Click a colour to select it"),
br(),
img(id = "allcols-spinner",
src = file.path("cpg", "img", "ajax-loader.gif")
),
uiOutput("allColsSection")
)
)
)
)
server <- function(input, output, session) {
values <- reactiveValues(
selectedCols = rep("#FFFFFF", numCols),
selectedNum = 1,
colUpdateSrc = 0
)
# User canceled
observeEvent(input$cancel, {
stopApp(stop("User canceled colour selection", call. = FALSE))
})
# Don't allow user to remove the last colour
observe({
shinyjs::toggleState("removeColBtn",
condition = length(values$selectedCols) > 1)
})
# User is done selecting colours
observeEvent(input$done, {
cols <- values$selectedCols
shinyjs::disable(selector = "#cancel, #done")
if (input$returnTypeName) {
cols <- lapply(cols, getColNameOrHex)
cols <- unlist(cols)
}
stopApp(cols)
})
# Add another colour to select
shinyjs::onclick("addColBtn", {
values$selectedCols <- c(values$selectedCols, "#FFFFFF")
})
# Remove the selected colour
shinyjs::onclick("removeColBtn", {
if (length(values$selectedCols) == 1) {
return()
}
values$selectedCols <- values$selectedCols[-values$selectedNum]
if (values$selectedNum > length(values$selectedCols)) {
values$selectedNum <- length(values$selectedCols)
}
})
# Render the chosen colours
output$selectedCols <- renderUI({
lapply(seq_along(values$selectedCols), function(colNum) {
cls <- "col col-transparent-box"
if (colNum == values$selectedNum) {
cls <- paste0(cls, " selected")
}
if (isColDark(values$selectedCols[colNum])) {
cls <- paste0(cls, " col-dark")
}
div(
class = cls,
div(
style = paste0("background:",
hex2rgba_str(values$selectedCols[colNum])),
class = "selected-col-inner",
`data-colnum` = colNum,
colNum
)
)
})
})
# Receive event from JS: a different colour number was selected
observeEvent(input$jsColNum, {
newNum <- input$jsColNum[1]
if (newNum < 1 || newNum > length(values$selectedCols)) {
return()
}
values$selectedNum <- newNum
})
# A colour from the "any colour" input is chosen
observeEvent(input$anyColInput, {
if (values$colUpdateSrc == 1) {
values$colUpdateSrc <- 0
return()
}
# Make sure we don't get into a loop of the selected colour and the
# colour input updating each other
values$colUpdateSrc <- 2
values$selectedCols[values$selectedNum] <- input$anyColInput
})
# Receive event from JS: an R colour was selected from one of the two tabs
# Because of how Shiny works, the input from JS needs to also contain
# a dummy random variable, so that when the user chooses the same colour
# twice, it will register the second time as well
observeEvent(input$jsCol, {
values$selectedCols[values$selectedNum] <- input$jsCol[1]
})
# Update the colour input to the currently selected colour
observeEvent(list(values$selectedCols, values$selectedNum), {
if (values$colUpdateSrc == 2) {
values$colUpdateSrc <- 0
return()
}
values$colUpdateSrc <- 1
# Make sure we don't get into a loop of the selected colour and the
# colour input updating each other
newCol <- values$selectedCols[values$selectedNum]
if (!is.null(input$anyColInput) && input$anyColInput == newCol) {
values$colUpdateSrc <- 0
}
colourpicker::updateColourInput(session, "anyColInput", value = newCol)
})
# Receive event from JS: navigate to the colour to the left/right
observeEvent(input$jsColNav, {
newNum <- values$selectedNum + input$jsColNav[1]
if (newNum == 0) {
newNum <- length(values$selectedCols)
} else if (newNum == length(values$selectedCols) + 1) {
newNum <- 1
}
values$selectedNum <- newNum
})
# Render all the R colours
output$allColsSection <- renderUI({
lapply(
grDevices::colours(distinct = TRUE),
function(x) {
actionLink(
paste0("rcol-", x),
label = NULL,
class = "rcol",
style = paste0("background: ", col2hex(x)),
title = x,
`data-col` = col2hex(x)
)
}
)
})
# After the user chooses a colour, show all the similar R colours
output$rclosecolsSection <- renderUI({
rcols <- closestColHex(input$rclosecolInput, n = input$numSimilar)
tagList(
div(
id = "rcolsnames",
lapply(
seq_along(rcols),
function(x) {
div(
class = "rcolbox",
actionLink(
paste0("rclosecol-", x),
label = NULL,
class = "rcol rcolbig",
style = paste0("background: ", col2hex(rcols[x])),
title = rcols[x],
`data-col` = col2hex(rcols[x])
),
span(rcols[x], class = "rcolname")
)
}
)
)
)
})
# Show the keyboard shortcuts
observeEvent(input$showShortcuts, {
# If it's an old shiny version that doesn't support modals, use an alert
if (utils::packageVersion("shiny") < "0.14") {
shinyjs::alert(paste(
sep = "\n",
"Left/Right Arrows Select previous/next colour",
"Numbers 1-9 Select colour 1-9",
"Spacebar Add another colour",
"Delete Remove selected colour",
"Enter Done",
"Esc Close the colour helper"
))
return()
}
showModal(modalDialog(
easyClose = FALSE,
title = "Keyboard shortcuts",
div(
class = "ksh",
span(
class = "ksh-left",
span(class = "ksh-key", HTML("←")),
"/",
span(class = "ksh-key", HTML("→"))
),
span(class = "ksh-right", "Select previous/next colour")
),
div(
class = "ksh",
span(
class = "ksh-left",
span(class = "ksh-key", "1"),
"-",
span(class = "ksh-key", "9")
),
span(class = "ksh-right", "Select colour 1-9")
),
div(
class = "ksh",
span(
class = "ksh-left",
span(class = "ksh-key", HTML(" Spacebar "))
),
span(class = "ksh-right", "Add another colour")
),
div(
class = "ksh",
span(
class = "ksh-left",
span(class = "ksh-key", "Delete")
),
span(class = "ksh-right", "Remove selected colour")
),
div(
class = "ksh",
span(
class = "ksh-left",
span(class = "ksh-key", "Enter")
),
span(class = "ksh-right",
HTML("Done"))
),
div(
class = "ksh",
span(
class = "ksh-left",
span(class = "ksh-key", "Esc")
),
span(class = "ksh-right", "Close the colour helper")
),
footer = "Press any key to dismiss"
))
})
# Close the keyboard shortcuts modal
observeEvent(input$hideShortcuts, {
removeModal()
})
}
viewer <- shiny::browserViewer()
shiny::runGadget(shiny::shinyApp(ui, server), viewer = viewer,
stopOnCancel = FALSE)
}