Method doWork

src/service/resources-impl.js:1648–1676

()

      VISIBLE: visible,
    } = VisibilityState_Enum;
    const doWork = () => {
      // If viewport size is 0, the manager will wait for the resize event.
      const viewportSize = this.viewport_.getSize();
      if (viewportSize.height > 0 && viewportSize.width > 0) {
        // 1. Handle all size-change requests. 1x mutate (+1 vsync measure/mutate for above-fold resizes).
        if (this.hasMutateWork_()) {
          this.mutateWork_();
        }
        // 2. Build/measure/in-viewport/schedule layouts. 1x mutate & measure.
        this.discoverWork_();
        // 3. Execute scheduled layouts and preloads. 1x mutate.
        let delay = this.work_();
        // 4. Deferred size-change requests (waiting for scrolling to stop) will shorten delay until next pass.
        if (this.hasMutateWork_()) {
          // Overflow mutate work.
          delay = Math.min(delay, MUTATE_DEFER_DELAY_);
        }
        if (this.visible_) {
          if (this.schedulePass(delay)) {
            dev().fine(TAG_, 'next pass:', delay);
          } else {
            dev().fine(TAG_, 'pass already scheduled');
          }
        } else {
          dev().fine(TAG_, 'document is not visible: no scheduling');
        }
        this.firstPassDone_.resolve();
      }
    };
    const noop = () => {};
    const pause = () => {
      this.resources_.forEach((r) => r.pause());