File: public/js/tinymce/src/themes/mobile/src/main/js/ios/smooth/BackgroundActivity.js

define(
  'tinymce.themes.mobile.ios.smooth.BackgroundActivity',

  [
    'ephox.katamari.api.Cell',
    'ephox.katamari.api.LazyValue'
  ],

  function (Cell, LazyValue) {
    return function (doAction) {
      // Start the activity in idle state.
      var action = Cell(
        LazyValue.pure({})
      );

      var start = function (value) {
        var future = LazyValue.nu(function (callback) {
          return doAction(value).get(callback);
        });

        // Note: LazyValue kicks off immediately
        action.set(future);
      };

      // Idle will fire g once the current action is complete.
      var idle = function (g) {
        action.get().get(function () {
          g();
        });
      };

      return {
        start: start,
        idle: idle
      };
    };
  }
);