Method runAnimMutateSeries

src/service/vsync-impl.js:342–365

* Runs the series of mutates until the mutator returns a false value. * @param {!Node} contextNode * @param {function(time, time, !VsyncStateDef):boolean} mutator The * mutator callback. Only expected to do DOM writes, not reads. If the * returned value is true, the vsync task will b

(contextNode, mutator, opt_timeout)

   *   timeout.
   */
  runAnimMutateSeries(contextNode, mutator, opt_timeout) {
    if (!this.canAnimate_(contextNode)) {
      return Promise.reject(cancellation());
    }
    return new Promise((resolve, reject) => {
      const startTime = Date.now();
      let prevTime = 0;
      const task = this.createAnimTask(contextNode, {
        mutate: (state) => {
          const timeSinceStart = Date.now() - startTime;
          const res = mutator(timeSinceStart, timeSinceStart - prevTime, state);
          if (!res) {
            resolve();
          } else if (opt_timeout && timeSinceStart > opt_timeout) {
            reject(new Error('timeout'));
          } else {
            prevTime = timeSinceStart;
            task(state);
          }
        },
      });
      task({});
    });
  }

  /** @private */
  schedule_() {