Method unregisterContainer

src/utils/display-observer.js:207–235

* @param {!Element} container

(container)

   * @param {!Element} container
   */
  unregisterContainer(container) {
    const index = findObserverByContainer(this.observers_, container);
    if (index < CUSTOM_CONTAINER_OFFSET) {
      // The container has been unregistered already.
      return;
    }

    // Remove observer.
    const observer = this.observers_[index];
    this.observers_.splice(index, 1);
    if (observer.io) {
      observer.io.disconnect();
    }

    // Unobserve the container itself.
    this.unobserve(container, this.containerObserved_);

    // Remove observations.
    this.targetObserverCallbacks_.forEach((callbacks, target) => {
      const observations = this.targetObservations_.get(target);
      if (!observations || observations.length <= index) {
        return;
      }
      const oldDisplay = computeDisplay(observations, this.isDocDisplay_);
      observations.splice(index, 1);
      const newDisplay = computeDisplay(observations, this.isDocDisplay_);
      notifyIfChanged(callbacks, target, newDisplay, oldDisplay);
    });
  }

  /**
   * @param {!Element} target