Function tryRenderOnce

packages/core/src/app/createApp/renderLoop.ts:292–421

()

  }

  function tryRenderOnce(): void {
    if (!options.isRunning()) return;
    if (options.getLifecycleBusy() === "stop") return;
    if (options.dirtyTracker.getFlags() === 0) return;
    const maxInFlight =
      options.config.maxFramesInFlight + (options.getInteractiveBudget() > 0 ? 1 : 0);
    if (options.getFramesInFlight() >= maxInFlight) return;
    const mode = options.getMode();
    if (mode === null) return;

    if (PERF_ENABLED) {
      const scheduleWaitStartMs = options.getScheduleWaitStartMs();
      if (scheduleWaitStartMs !== null) {
        perfMarkEnd("schedule_wait", scheduleWaitStartMs);
        options.setScheduleWaitStartMs(null);
      }
    }

    const dirtyVersionStart = options.dirtyTracker.snapshotVersions();
    const snapshot = options.getCommittedState();
    const hooks = {
      enterRender: () => {
        options.setInRender(true);
      },
      exitRender: () => {
        options.setInRender(false);
      },
    };

    if (mode === "raw") {
      const drawFn = options.getDrawFn();
      if (!drawFn) return;

      const renderStartMs = monotonicNowMs();
      const submitToken = perfMarkStart("submit_frame");
      const res = options.rawRenderer.submitFrame(drawFn, hooks);
      perfMarkEnd("submit_frame", submitToken);
      if (!res.ok) {
        options.fatalNowOrEnqueue(res.code, res.detail);
        return;
      }
      if (!emitInternalRenderMetrics(monotonicNowMs() - renderStartMs)) return;

      const submitStartMs = PERF_ENABLED ? submitToken : null;
      const buildEndMs = PERF_ENABLED ? perfNow() : null;
      options.setFramesInFlight(options.getFramesInFlight() + 1);
      if (options.getInteractiveBudget() > 0) {
        options.setInteractiveBudget(options.getInteractiveBudget() - 1);
      }
      scheduleFrameSettlement(res.inFlight, submitStartMs, buildEndMs);
      options.dirtyTracker.clearConsumedFlags(
        DIRTY_RENDER | DIRTY_LAYOUT | DIRTY_VIEW,
        dirtyVersionStart,
      );
      return;
    }

    const viewFn = options.getViewFn();