Method constructor

frontend/app/src/StreamlitLib.test.tsx:136–190

(props: Props)

  private readonly componentRegistry: ComponentRegistry

  public constructor(props: Props) {
    super(props)

    // Initialize managers
    this.widgetMgr = new WidgetStateManager({
      sendRerunBackMsg: this.sendRerunBackMsg,
      formsDataChanged: formsData => this.setState({ formsData }),
    })

    this.componentRegistry = new ComponentRegistry(this.endpoints)

    this.uploadClient = new FileUploadClient({
      sessionInfo: this.sessionInfo,
      endpoints: this.endpoints,
      // A form cannot be submitted if it contains a FileUploader widget
      // that's currently uploading. We write that state here, in response
      // to a FileUploadClient callback. The FormSubmitButton element
      // reads the state.
      formsWithPendingRequestsChanged: formIds =>
        this.widgetMgr.setFormsWithUploadsInProgress(formIds),
      requestFileURLs: vi.fn(),
    })

    this.sessionInfo.setCurrent({
      // Disable ForwardMessageCaching:
      maxCachedMessageAge: 0,

      // Used by FileUploadClient to associate file uploads with
      // sessions.
      sessionId: "mockSessionId",

      // Unused by StreamlitLib:
      appId: "",
      streamlitVersion: "",
      pythonVersion: "",
      serverOS: "",
      hasDisplay: true,
      installationId: "",
      installationIdV3: "",
      installationIdV4: "",
      commandLine: "",
      isHello: false,
      isConnected: true,
    })

    // Initialize React state
    this.state = {
      elements: AppRoot.empty(""),
      formsData: createFormsData(),
      scriptRunState: ScriptRunState.NOT_RUNNING,
      // ScriptRunID should get a new unique ID every time the
      // Streamlit view is being "rebuilt".
      scriptRunId: `${0}`,
    }
  }

  /**
   * Should be called before the first Delta from a "script run" is handled.