Serialization plugin module — preserve

Board state can be preserved by serializing all contained objects and restored via de-serialization. This mechanism can be used to power features such as save/restore (via download, as implemented in the default preserve_board plugin), but more refined user experience is conceivable in terms of undo/redo functionality and (automatic) saving of board state. Such enhancements can be implemented in a third-party preserve_board module.

Usage

preserve_board(server = preserve_board_server, ui = preserve_board_ui)

preserve_board_server(id, board, ...)

preserve_board_ui(id, board)

Arguments

server, ui: Server/UI for the plugin module
id: Namespace ID
board: The initial board object
...: Extra arguments passed from parent scope

Value

A plugin container inheriting from preserve_board is returned by preserve_board(), while the UI component (e.g. preserve_board_ui()) is expected to return shiny UI (i.e. shiny::tagList()) and the server component (i.e. preserve_board_server()) is expected to return a shiny::reactiveVal() or shiny::reactive() which evaluates to NULL or a board object.