Panviz Actionman

Arbitrary implementation of Command design pattern for cross-modules communication with logging. This enables undo / redo and actions log functionality.

Live demo

Functionality

• action panel button click - fire action
• enable / disable action
• action panel toggle button
• multiple components subscribe to action
• some components subscribe / some not
• granular update (providing component ids while firing an action)
• action log
• undo / redo

• ADD TO DEMO: evaluate if the action can be executed

TODO

• multiple steps undo / redo
• queue of actions
• Sequences of Command objects can be assembled into composite (or macro) commands.

Consideration on implementation

• Any action should have "id" differentiation? in terms of "check at a dinner" example: specifying id for the action is telling the Waiter, that Customer want a specific person to cook for him, while this person may or may not be available today or even be a Cook in this restaurant.
  • first param of action.apply is always ids array
  • How to fire an action for all ids?
    • pass 'all'
    • do not specify any
• Does actionman is required / able to keep track of all actions?
  • YES, Actionman is by it's name a manager of actions
• How to undo / redo?
  • Should Undo / Redo be actions too?
    • No, because it is not specific to particular registrar
  • actionman.undo()
    • the way to trigger undo of the last action
  • concreteAction.undo()
    • actual way to undo

• Should Actionman be a singleton
  • Pros
    • no need to pass the reference to actionman around to each consumer
  • Cons
    • there will be no ability to create multiple instances of application on the same page for them to track their actions independently
• Should Action be a singleton?
  • Pros
    • same as for actionman
  • Cons
    • same as for actionman
    • if not a singleton, consumer needs to ask actionman for an action