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server <- function(input, output, session) {
plotnum <- reactiveVal(0)
spinner_params <- reactive({
if (input$type == "custom") {
params <- list(
ui_element = plotOutput(paste0("example", plotnum())),
image = input$image,
image.width = if (input$image_size_default) NULL else input$image.width,
image.height = if (input$image_size_default) NULL else input$image.height
)
} else {
params <- list(
ui_element = plotOutput(paste0("example", plotnum())),
type = as.numeric(input$type),
color = input$col,
size = input$size,
color.background = "#fafafa"
)
}
if (nzchar(input$caption)) {
params$caption <- input$caption
}
params
})
output$show_example <- renderUI({
suppressWarnings(do.call(shinycssloaders::withSpinner, spinner_params()))
})
observeEvent(input$update, ignoreNULL = FALSE, {
plotnum(plotnum() + 1)
output[[paste0("example", plotnum())]] <- renderPlot({
bg <- par(bg = "#fafafa")
shinyjs::disable("params")
on.exit(shinyjs::enable("params"))
Sys.sleep(isolate(input$time))
plot(runif(10), main = "Random Plot")
bg <- par(bg = bg)
})
})
observeEvent(input$show, {
params <- spinner_params()
params$ui_element <- NULL
params$background <- input$bg
suppressWarnings(do.call(shinycssloaders::showPageSpinner, params))
Sys.sleep(input$time)
hidePageSpinner()
})
}
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