Method performAsync

modules/core/EditSystem.js:315–358

* performAsync * Promisified version of `perform` that can support eased edits in a transition. * This version of `perform` accepts a single Action function argument. * If the Action is marked as being "transitionable", run it multiple times with * eased time parameter from 0..1 to cre

(action)

   * @return  {Promise}   Promise fulfilled when the transition is completed
   */
  performAsync(action) {
    d3_select(document).interrupt('editTransition');    // complete any transition already in progress

    if (typeof action !== 'function') {
      return Promise.reject();
    }

    if (!action.transitionable) {
      this._perform([action], 1);
      this._updateChanges();
      return Promise.resolve();
    }

    const DURATION = 150;

    return new Promise(resolve => {
      d3_select(document)
        .transition('editTransition')
        .duration(DURATION)
        .ease(d3_easeLinear)
        .tween('edit.tween', () => {
          return (t) => {
            if (t < 1) {
              this._replaceStaging();
              this._perform([action], t);
              this._updateChanges();
            }
          };
        })
        .on('start', () => {
          this._inTransition = true;
          this._replaceStaging();
          this._perform([action], 0);
          this._updateChanges();
        })
        .on('end interrupt', () => {
          this._replaceStaging();
          this._perform([action], 1);
          this._updateChanges();
          this._inTransition = false;
          resolve();
        });
    });
  }


  /**