Nothing
library(shiny)
library(R6)
#----------------------------------------------------------------------------------------------------
buttonStyle <- "margin: 5px; margin-right: 0px; font-size: 14px;"
Simple.R6.Shiny = R6Class("Simple.R6.Shiny",
#--------------------------------------------------------------------------------
private = list(currentValue=NULL),
#--------------------------------------------------------------------------------
public = list(
initialize = function(){
message(sprintf("initializing Simple.R6.shiny app"))
private$currentValue <- 0
},
#------------------------------------------------------------
ui = function(){
fluidPage(
titlePanel(title="Simple R6 shiny"),
sidebarLayout(
sidebarPanel(
actionButton("incrementValueButton", "Increment Value"), HTML("<br><br>"),
actionButton("printValueButton", "Print Value to stdout"),HTML("<br><br>"),
actionButton("displayValueButton", "Display Current Value"),
width=3
),
mainPanel(
fluidRow(
div(style="height:50px; border: 5px solid red; width:500px;",
verbatimTextOutput("textDisplayOutput", placeholder = TRUE)
)
),
width=9
)
) # sidebarLayout
)}, # ui
#------------------------------------------------------------
server = function(input, output, session){
output$textDisplayOutput <- renderText({private$currentValue})
observeEvent(input$incrementValueButton, ignoreInit=TRUE, {
private$currentValue <- private$currentValue + 1
output$textDisplayOutput <- renderText({private$currentValue})
})
observeEvent(input$printValueButton, ignoreInit=TRUE, {
message(sprintf("currentValue: %d", private$currentValue))
})
} # server
) # public
) # class
#--------------------------------------------------------------------------------
app <- Simple.R6.Shiny$new()
runApp(shinyApp(app$ui, app$server), port=9990, launch.browser=TRUE)
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