Method constructor

src/chunk.js:290–339

* @param {!./service/ampdoc-impl.AmpDoc} ampDoc

(ampDoc)

   * @param {!./service/ampdoc-impl.AmpDoc} ampDoc
   */
  constructor(ampDoc) {
    /** @protected @const {!./service/ampdoc-impl.AmpDoc} */
    this.ampdoc = ampDoc;
    /** @private @const {!Window} */
    this.win_ = ampDoc.win;
    /** @private @const {!PriorityQueue<Task>} */
    this.tasks_ = new PriorityQueue();
    /** @private @const {function(?IdleDeadline)} */
    this.boundExecute_ = this.execute_.bind(this);
    /** @private {number} */
    this.durationOfLastExecution_ = 0;
    /** @private @const {boolean} */
    this.supportsInputPending_ = !!(
      this.win_.navigator.scheduling &&
      this.win_.navigator.scheduling.isInputPending
    );

    /**
     * Set to true if we scheduled a macro or micro task to execute the next
     * task. If true, we don't schedule another one.
     * Not set to true if we use rIC, because we always want to transition
     * to immeditate invocation from that state.
     * @private {boolean}
     */
    this.scheduledImmediateInvocation_ = false;
    /** @private {boolean} Whether the document can actually be painted. */
    this.bodyIsVisible_ = this.win_.document.documentElement.hasAttribute(
      'i-amphtml-no-boilerplate'
    );

    this.win_.addEventListener('message', (e) => {
      if (getData(e) == 'amp-macro-task') {
        this.execute_(/* idleDeadline */ null);
      }
    });

    /** @protected {boolean} */
    this.coreReady_ = false;
    Services.viewerPromiseForDoc(ampDoc).then(() => {
      // Once the viewer has been resolved, most of core runtime has been
      // initialized as well.
      this.coreReady_ = true;
    });

    ampDoc.onVisibilityChanged(() => {
      if (ampDoc.isVisible()) {
        this.schedule_();
      }
    });
  }

  /**
   * Run fn as a "chunk".