Undoer.coffee

window.undo_tracking_labels = {}
class Sysdea.Undoer
  constructor: (@label) ->
    if @label? and !undo_tracking_labels[@label]
      undo_tracking_labels[@label] = 0
    @actions = []
  push: (action) ->
    if @label and @actions.length == 0
      undo_tracking_labels[@label]++
    @actions.push action
  child: (label) ->
    undoer = new Sysdea.Undoer "#{@label} > #{label}"
    @push undoer.run
    undoer
  record: (undo) ->
    @push undo
  run: =>
    @actions.reverse()
    action() for action in @actions
    if @label and @actions.length > 0
      undo_tracking_labels[@label]--
    @actions = []
  onoff: (target, args...) ->
    target.on.apply(target, args)
    @push -> target.off.apply(target, args)
  addremove: (target, args...) ->
    target.addEventListener.apply(target, args)
    @push -> target.removeEventListener.apply(target, args)
  recordRemove: (target) ->
    @push -> target.remove()
    target