Method setReadyStateInternal

src/custom-element.js:858–899

* Update the internal ready state. * * @param {!ReadyState_Enum} state * @param {*=} opt_failure * @protected * @final

(state, opt_failure)

     * @final
     */
    setReadyStateInternal(state, opt_failure) {
      if (state === this.readyState_) {
        return;
      }

      this.readyState_ = state;

      if (!this.R1()) {
        return;
      }

      switch (state) {
        case ReadyState_Enum.LOADING:
          this.signals_.signal(CommonSignals_Enum.LOAD_START);
          this.signals_.reset(CommonSignals_Enum.UNLOAD);
          this.signals_.reset(CommonSignals_Enum.LOAD_END);
          this.classList.add('i-amphtml-layout');
          // Potentially start the loading indicator.
          this.toggleLoading(true);
          this.dispatchCustomEventForTesting(AmpEvents_Enum.LOAD_START);
          return;
        case ReadyState_Enum.COMPLETE:
          // LOAD_START is set just in case. It won't be overwritten if
          // it had been set before.
          this.signals_.signal(CommonSignals_Enum.LOAD_START);
          this.signals_.signal(CommonSignals_Enum.LOAD_END);
          this.signals_.reset(CommonSignals_Enum.UNLOAD);
          this.classList.add('i-amphtml-layout');
          this.toggleLoading(false);
          dom.dispatchCustomEvent(this, 'load', null, NO_BUBBLES);
          this.dispatchCustomEventForTesting(AmpEvents_Enum.LOAD_END);
          return;
        case ReadyState_Enum.ERROR:
          this.signals_.rejectSignal(
            CommonSignals_Enum.LOAD_END,
            /** @type {!Error} */ (opt_failure)
          );
          this.toggleLoading(false);
          dom.dispatchCustomEvent(this, 'error', opt_failure, NO_BUBBLES);
          return;
      }
    }

    /**
     * Called to instruct the element to preconnect to hosts it uses during