base-video-list-view.coffee

class BaseVideoListView extends Backbone.View
  initialize: (opts) ->

    @collection.selectedCount.assign @subNav.find('.selected_count'), 'text'
    @collection.selectedCount.onValue (val) =>
      @subNav.find('.library-nav').toggleClass 'singular-selection', val == 1
      this.$el.toggleClass 'multiple-selection', val > 1
    @collection.hasSelected.assign @subNav.find('.visible-selected'), 'toggle'
    @collection.hasSelected.not().assign @subNav.find('.hidden-selected'), 'toggle'

    @collection.hasPlayableSelected.assign @subNav.find('.visible-playable-selected,.visible-unpublishable-selected'), 'toggle'
    @collection.hasDebrandableSelected.assign @subNav.find('.visible-debrandable-selected'), 'toggle'

    @collection.hasPublishableSelected.assign @subNav.find('.visible-publishable-selected'), 'toggle'

    @collection
      .selected.map((c) -> c.filter((m) -> !!m.get('public') || !!m.get('free')))
      .map((c) -> c.length > 0).toProperty()
      .assign @subNav.find('.visible-playable-debrandabĺe-selected'), 'toggle'

video-collection.coffee

class VideoCollection extends Backbone.Collection
  url: '/videos'
  model: VideoModel
  initialize: ->
    @changed                = @asEventStream("add remove reset change select").map(this)
    @selected               = @changed.map => @filter (t) -> t.selected
    @debrandableSelected    = @selected.map (c) -> c.filter (t) -> !!t.get('free')
    @playableSelected       = @selected.map (c) -> c.filter (t) -> !!t.get('public')
    @publishableSelected    = @selected.map (c) -> c.filter (t) -> !t.get('public')
    @selectedCount          = @selected.map((c) -> c.length).toProperty()
    @hasSelected            = @selected.map((c) -> c.length > 0).toProperty()
    @hasPlayableSelected    = @playableSelected.map((c) -> c.length > 0).toProperty()
    @hasPublishableSelected = @publishableSelected.map((c) -> c.length > 0).toProperty()
    @hasDebrandableSelected = @debrandableSelected.map((c) -> c.length > 0).toProperty()