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Fully disable undo/redo for a session

Source: R/api.R
rewind_disable.Rd

rewind_pause() stops capture for a short time. It needs a rewind_resume() call after it. This function is different. It removes everything that rewind_enable() made:

Usage

rewind_disable(session = shiny::getDefaultReactiveDomain())

Arguments

session

The Shiny session. The default is the current session.

Value

TRUE if the function disabled a session. FALSE if rewind was not enabled. The function returns the value invisibly.

Details

  • it destroys each observer;

  • it sets the buttons and the history rail in the browser to their empty, disabled condition;

  • it returns the session to the condition before rewind_enable().

Call rewind_enable() again to start a new history.

Use this function when the application permits undo and redo only in some conditions. An example is a user role that the application does not know at the start of the session.

Examples

if (interactive()) {
  library(shiny)

  server <- function(input, output, session) {
    rewind_enable()
    observeEvent(input$readonly_mode, {
      if (input$readonly_mode) rewind_disable()
    })
  }
}