Exemplo n.º 1
0
 def video(self, ) -> Optional[Video]:
     context_options = self._browser_context._options
     if "recordVideo" not in context_options:
         return None
     if not self._video:
         self._video = Video(self)
         if "videoRelativePath" in self._initializer:
             self._video._set_relative_path(
                 self._initializer["videoRelativePath"])
     return self._video
Exemplo n.º 2
0
 def video(self, ) -> Optional[Video]:
     if "recordVideo" not in self._browser_context._options:
         return None
     if not self._video:
         self._video = Video(self)
     return self._video
Exemplo n.º 3
0
class Page(ChannelOwner):

    Events = SimpleNamespace(
        Close="close",
        Crash="crash",
        Console="console",
        Dialog="dialog",
        Download="download",
        FileChooser="filechooser",
        DOMContentLoaded="domcontentloaded",
        PageError="pageerror",
        Request="request",
        Response="response",
        RequestFailed="requestfailed",
        RequestFinished="requestfinished",
        FrameAttached="frameattached",
        FrameDetached="framedetached",
        FrameNavigated="framenavigated",
        Load="load",
        Popup="popup",
        WebSocket="websocket",
        Worker="worker",
    )
    accessibility: Accessibility
    keyboard: Keyboard
    mouse: Mouse
    touchscreen: Touchscreen

    def __init__(self, parent: ChannelOwner, type: str, guid: str,
                 initializer: Dict) -> None:
        super().__init__(parent, type, guid, initializer)
        self.accessibility = Accessibility(self._channel)
        self.keyboard = Keyboard(self._channel)
        self.mouse = Mouse(self._channel)
        self.touchscreen = Touchscreen(self._channel)

        self._main_frame: Frame = from_channel(initializer["mainFrame"])
        self._main_frame._page = self
        self._frames = [self._main_frame]
        self._viewport_size: Optional[ViewportSize] = initializer.get(
            "viewportSize")
        self._is_closed = False
        self._workers: List["Worker"] = []
        self._bindings: Dict[str, Any] = {}
        self._routes: List[RouteHandlerEntry] = []
        self._owned_context: Optional["BrowserContext"] = None
        self._timeout_settings: TimeoutSettings = TimeoutSettings(None)
        self._video: Optional[Video] = None

        self._channel.on(
            "bindingCall",
            lambda params: self._on_binding(from_channel(params["binding"])),
        )
        self._channel.on("close", lambda _: self._on_close())
        self._channel.on(
            "console",
            lambda params: self.emit(Page.Events.Console,
                                     from_channel(params["message"])),
        )
        self._channel.on("crash", lambda _: self._on_crash())
        self._channel.on("dialog", lambda params: self._on_dialog(params))
        self._channel.on("domcontentloaded",
                         lambda _: self.emit(Page.Events.DOMContentLoaded))
        self._channel.on(
            "download",
            lambda params: self.emit(Page.Events.Download,
                                     from_channel(params["download"])),
        )
        self._channel.on(
            "fileChooser",
            lambda params: self.emit(
                Page.Events.FileChooser,
                FileChooser(self, from_channel(params["element"]), params[
                    "isMultiple"]),
            ),
        )
        self._channel.on(
            "frameAttached",
            lambda params: self._on_frame_attached(
                from_channel(params["frame"])),
        )
        self._channel.on(
            "frameDetached",
            lambda params: self._on_frame_detached(
                from_channel(params["frame"])),
        )
        self._channel.on("load", lambda _: self.emit(Page.Events.Load))
        self._channel.on(
            "pageError",
            lambda params: self.emit(Page.Events.PageError,
                                     parse_error(params["error"]["error"])),
        )
        self._channel.on(
            "popup",
            lambda params: self.emit(Page.Events.Popup,
                                     from_channel(params["page"])),
        )
        self._channel.on(
            "request",
            lambda params: self.emit(Page.Events.Request,
                                     from_channel(params["request"])),
        )
        self._channel.on(
            "requestFailed",
            lambda params: self._on_request_failed(
                from_channel(params["request"]),
                params["responseEndTiming"],
                params["failureText"],
            ),
        )
        self._channel.on(
            "requestFinished",
            lambda params: self._on_request_finished(
                from_channel(params["request"]), params["responseEndTiming"]),
        )
        self._channel.on(
            "response",
            lambda params: self.emit(Page.Events.Response,
                                     from_channel(params["response"])),
        )
        self._channel.on(
            "route",
            lambda params: self._on_route(from_channel(params["route"]),
                                          from_channel(params["request"])),
        )
        self._channel.on(
            "video",
            lambda params: cast(Video, self.video)._set_relative_path(params[
                "relativePath"]),
        )
        self._channel.on(
            "webSocket",
            lambda params: self.emit(Page.Events.WebSocket,
                                     from_channel(params["webSocket"])),
        )
        self._channel.on(
            "worker",
            lambda params: self._on_worker(from_channel(params["worker"])))

    def _set_browser_context(self, context: "BrowserContext") -> None:
        self._browser_context = context
        self._timeout_settings = TimeoutSettings(context._timeout_settings)

    def _on_request_failed(
        self,
        request: Request,
        response_end_timing: float,
        failure_text: str = None,
    ) -> None:
        request._failure_text = failure_text
        if request._timing:
            request._timing["responseEnd"] = response_end_timing
        self.emit(Page.Events.RequestFailed, request)

    def _on_request_finished(self, request: Request,
                             response_end_timing: float) -> None:
        if request._timing:
            request._timing["responseEnd"] = response_end_timing
        self.emit(Page.Events.RequestFinished, request)

    def _on_frame_attached(self, frame: Frame) -> None:
        frame._page = self
        self._frames.append(frame)
        self.emit(Page.Events.FrameAttached, frame)

    def _on_frame_detached(self, frame: Frame) -> None:
        self._frames.remove(frame)
        frame._detached = True
        self.emit(Page.Events.FrameDetached, frame)

    def _on_route(self, route: Route, request: Request) -> None:
        for handler_entry in self._routes:
            if handler_entry.matcher.matches(request.url):
                result = cast(Any, handler_entry.handler)(route, request)
                if inspect.iscoroutine(result):
                    asyncio.create_task(result)
                return
        self._browser_context._on_route(route, request)

    def _on_binding(self, binding_call: "BindingCall") -> None:
        func = self._bindings.get(binding_call._initializer["name"])
        if func:
            asyncio.create_task(binding_call.call(func))
        self._browser_context._on_binding(binding_call)

    def _on_worker(self, worker: "Worker") -> None:
        self._workers.append(worker)
        worker._page = self
        self.emit(Page.Events.Worker, worker)

    def _on_close(self) -> None:
        self._is_closed = True
        self._browser_context._pages.remove(self)
        self.emit(Page.Events.Close)

    def _on_crash(self) -> None:
        self.emit(Page.Events.Crash)

    def _on_dialog(self, params: Any) -> None:
        dialog = from_channel(params["dialog"])
        if self.listeners(Page.Events.Dialog):
            self.emit(Page.Events.Dialog, dialog)
        else:
            asyncio.create_task(dialog.dismiss())

    def _add_event_handler(self, event: str, k: Any, v: Any) -> None:
        if event == Page.Events.FileChooser and len(
                self.listeners(event)) == 0:
            self._channel.send_no_reply("setFileChooserInterceptedNoReply",
                                        {"intercepted": True})
        super()._add_event_handler(event, k, v)

    def remove_listener(self, event: str, f: Any) -> None:
        super().remove_listener(event, f)
        if event == Page.Events.FileChooser and len(
                self.listeners(event)) == 0:
            self._channel.send_no_reply("setFileChooserInterceptedNoReply",
                                        {"intercepted": False})

    @property
    def context(self) -> "BrowserContext":
        return self._browser_context

    async def opener(self) -> Optional["Page"]:
        return from_nullable_channel(await self._channel.send("opener"))

    @property
    def main_frame(self) -> Frame:
        return self._main_frame

    def frame(self, name: str = None, url: URLMatch = None) -> Optional[Frame]:
        matcher = URLMatcher(url) if url else None
        for frame in self._frames:
            if name and frame.name == name:
                return frame
            if url and matcher and matcher.matches(frame.url):
                return frame
        return None

    @property
    def frames(self) -> List[Frame]:
        return self._frames.copy()

    def set_default_navigation_timeout(self, timeout: float) -> None:
        self._timeout_settings.set_navigation_timeout(timeout)
        self._channel.send_no_reply("setDefaultNavigationTimeoutNoReply",
                                    dict(timeout=timeout))

    def set_default_timeout(self, timeout: float) -> None:
        self._timeout_settings.set_timeout(timeout)
        self._channel.send_no_reply("setDefaultTimeoutNoReply",
                                    dict(timeout=timeout))

    async def query_selector(self, selector: str) -> Optional[ElementHandle]:
        return await self._main_frame.query_selector(selector)

    async def query_selector_all(self, selector: str) -> List[ElementHandle]:
        return await self._main_frame.query_selector_all(selector)

    async def wait_for_selector(
        self,
        selector: str,
        timeout: float = None,
        state: Literal["attached", "detached", "hidden", "visible"] = None,
    ) -> Optional[ElementHandle]:
        return await self._main_frame.wait_for_selector(
            **locals_to_params(locals()))

    async def is_checked(self, selector: str, timeout: float = None) -> bool:
        return await self._main_frame.is_checked(**locals_to_params(locals()))

    async def is_disabled(self, selector: str, timeout: float = None) -> bool:
        return await self._main_frame.is_disabled(**locals_to_params(locals()))

    async def is_editable(self, selector: str, timeout: float = None) -> bool:
        return await self._main_frame.is_editable(**locals_to_params(locals()))

    async def is_enabled(self, selector: str, timeout: float = None) -> bool:
        return await self._main_frame.is_enabled(**locals_to_params(locals()))

    async def is_hidden(self, selector: str, timeout: float = None) -> bool:
        return await self._main_frame.is_hidden(**locals_to_params(locals()))

    async def is_visible(self, selector: str, timeout: float = None) -> bool:
        return await self._main_frame.is_visible(**locals_to_params(locals()))

    async def dispatch_event(self,
                             selector: str,
                             type: str,
                             eventInit: Dict = None,
                             timeout: float = None) -> None:
        return await self._main_frame.dispatch_event(
            **locals_to_params(locals()))

    async def evaluate(self, expression: str, arg: Serializable = None) -> Any:
        return await self._main_frame.evaluate(expression, arg)

    async def evaluate_handle(self,
                              expression: str,
                              arg: Serializable = None) -> JSHandle:
        return await self._main_frame.evaluate_handle(expression, arg)

    async def eval_on_selector(
        self,
        selector: str,
        expression: str,
        arg: Serializable = None,
    ) -> Any:
        return await self._main_frame.eval_on_selector(selector, expression,
                                                       arg)

    async def eval_on_selector_all(
        self,
        selector: str,
        expression: str,
        arg: Serializable = None,
    ) -> Any:
        return await self._main_frame.eval_on_selector_all(
            selector, expression, arg)

    async def add_script_tag(
        self,
        url: str = None,
        path: Union[str, Path] = None,
        content: str = None,
        type: str = None,
    ) -> ElementHandle:
        return await self._main_frame.add_script_tag(
            **locals_to_params(locals()))

    async def add_style_tag(self,
                            url: str = None,
                            path: Union[str, Path] = None,
                            content: str = None) -> ElementHandle:
        return await self._main_frame.add_style_tag(
            **locals_to_params(locals()))

    async def expose_function(self, name: str, callback: Callable) -> None:
        await self.expose_binding(name, lambda source, *args: callback(*args))

    async def expose_binding(self,
                             name: str,
                             callback: Callable,
                             handle: bool = None) -> None:
        if name in self._bindings:
            raise Error(f'Function "{name}" has been already registered')
        if name in self._browser_context._bindings:
            raise Error(
                f'Function "{name}" has been already registered in the browser context'
            )
        self._bindings[name] = callback
        await self._channel.send("exposeBinding",
                                 dict(name=name, needsHandle=handle or False))

    async def set_extra_http_headers(self, headers: Dict[str, str]) -> None:
        await self._channel.send("setExtraHTTPHeaders",
                                 dict(headers=serialize_headers(headers)))

    @property
    def url(self) -> str:
        return self._main_frame.url

    async def content(self) -> str:
        return await self._main_frame.content()

    async def set_content(
        self,
        html: str,
        timeout: float = None,
        waitUntil: DocumentLoadState = None,
    ) -> None:
        return await self._main_frame.set_content(**locals_to_params(locals()))

    async def goto(
        self,
        url: str,
        timeout: float = None,
        waitUntil: DocumentLoadState = None,
        referer: str = None,
    ) -> Optional[Response]:
        return await self._main_frame.goto(**locals_to_params(locals()))

    async def reload(
        self,
        timeout: float = None,
        waitUntil: DocumentLoadState = None,
    ) -> Optional[Response]:
        return from_nullable_channel(await self._channel.send(
            "reload", locals_to_params(locals())))

    async def wait_for_load_state(self,
                                  state: DocumentLoadState = None,
                                  timeout: float = None) -> None:
        return await self._main_frame.wait_for_load_state(
            **locals_to_params(locals()))

    async def wait_for_event(self,
                             event: str,
                             predicate: Callable = None,
                             timeout: float = None) -> Any:
        async with self.expect_event(event, predicate, timeout) as event_info:
            pass
        return await event_info

    async def go_back(
        self,
        timeout: float = None,
        waitUntil: DocumentLoadState = None,
    ) -> Optional[Response]:
        return from_nullable_channel(await self._channel.send(
            "goBack", locals_to_params(locals())))

    async def go_forward(
        self,
        timeout: float = None,
        waitUntil: DocumentLoadState = None,
    ) -> Optional[Response]:
        return from_nullable_channel(await self._channel.send(
            "goForward", locals_to_params(locals())))

    async def emulate_media(
        self,
        media: Literal["print", "screen"] = None,
        colorScheme: ColorScheme = None,
    ) -> None:
        await self._channel.send("emulateMedia", locals_to_params(locals()))

    async def set_viewport_size(self, viewportSize: ViewportSize) -> None:
        self._viewport_size = viewportSize
        await self._channel.send("setViewportSize", locals_to_params(locals()))

    @property
    def viewport_size(self) -> Optional[ViewportSize]:
        return self._viewport_size

    async def bring_to_front(self) -> None:
        await self._channel.send("bringToFront")

    async def add_init_script(self,
                              script: str = None,
                              path: Union[str, Path] = None) -> None:
        if path:
            with open(path, "r") as file:
                script = file.read()
        if not isinstance(script, str):
            raise Error("Either path or source parameter must be specified")
        await self._channel.send("addInitScript", dict(source=script))

    async def route(self, url: URLMatch, handler: RouteHandler) -> None:
        self._routes.append(RouteHandlerEntry(URLMatcher(url), handler))
        if len(self._routes) == 1:
            await self._channel.send("setNetworkInterceptionEnabled",
                                     dict(enabled=True))

    async def unroute(self,
                      url: URLMatch,
                      handler: Optional[RouteHandler] = None) -> None:
        self._routes = list(
            filter(
                lambda r: r.matcher.match != url or
                (handler and r.handler != handler),
                self._routes,
            ))
        if len(self._routes) == 0:
            await self._channel.send("setNetworkInterceptionEnabled",
                                     dict(enabled=False))

    async def screenshot(
        self,
        timeout: float = None,
        type: Literal["jpeg", "png"] = None,
        path: Union[str, Path] = None,
        quality: int = None,
        omitBackground: bool = None,
        fullPage: bool = None,
        clip: FloatRect = None,
    ) -> bytes:
        params = locals_to_params(locals())
        if "path" in params:
            del params["path"]
        encoded_binary = await self._channel.send("screenshot", params)
        decoded_binary = base64.b64decode(encoded_binary)
        if path:
            with open(path, "wb") as fd:
                fd.write(decoded_binary)
        return decoded_binary

    async def title(self) -> str:
        return await self._main_frame.title()

    async def close(self, runBeforeUnload: bool = None) -> None:
        try:
            await self._channel.send("close", locals_to_params(locals()))
            if self._owned_context:
                await self._owned_context.close()
        except Exception as e:
            if not is_safe_close_error(e):
                raise e

    def is_closed(self) -> bool:
        return self._is_closed

    async def click(
        self,
        selector: str,
        modifiers: List[KeyboardModifier] = None,
        position: Position = None,
        delay: float = None,
        button: MouseButton = None,
        clickCount: int = None,
        timeout: float = None,
        force: bool = None,
        noWaitAfter: bool = None,
    ) -> None:
        return await self._main_frame.click(**locals_to_params(locals()))

    async def dblclick(
        self,
        selector: str,
        modifiers: List[KeyboardModifier] = None,
        position: Position = None,
        delay: float = None,
        button: MouseButton = None,
        timeout: float = None,
        force: bool = None,
        noWaitAfter: bool = None,
    ) -> None:
        return await self._main_frame.dblclick(**locals_to_params(locals()))

    async def tap(
        self,
        selector: str,
        modifiers: List[KeyboardModifier] = None,
        position: Position = None,
        timeout: float = None,
        force: bool = None,
        noWaitAfter: bool = None,
    ) -> None:
        return await self._main_frame.tap(**locals_to_params(locals()))

    async def fill(self,
                   selector: str,
                   value: str,
                   timeout: float = None,
                   noWaitAfter: bool = None) -> None:
        return await self._main_frame.fill(**locals_to_params(locals()))

    async def focus(self, selector: str, timeout: float = None) -> None:
        return await self._main_frame.focus(**locals_to_params(locals()))

    async def text_content(self,
                           selector: str,
                           timeout: float = None) -> Optional[str]:
        return await self._main_frame.text_content(**locals_to_params(locals())
                                                   )

    async def inner_text(self, selector: str, timeout: float = None) -> str:
        return await self._main_frame.inner_text(**locals_to_params(locals()))

    async def inner_html(self, selector: str, timeout: float = None) -> str:
        return await self._main_frame.inner_html(**locals_to_params(locals()))

    async def get_attribute(self,
                            selector: str,
                            name: str,
                            timeout: float = None) -> Optional[str]:
        return await self._main_frame.get_attribute(
            **locals_to_params(locals()))

    async def hover(
        self,
        selector: str,
        modifiers: List[KeyboardModifier] = None,
        position: Position = None,
        timeout: float = None,
        force: bool = None,
    ) -> None:
        return await self._main_frame.hover(**locals_to_params(locals()))

    async def select_option(
        self,
        selector: str,
        value: Union[str, List[str]] = None,
        index: Union[int, List[int]] = None,
        label: Union[str, List[str]] = None,
        element: Union["ElementHandle", List["ElementHandle"]] = None,
        timeout: float = None,
        noWaitAfter: bool = None,
    ) -> List[str]:
        params = locals_to_params(locals())
        return await self._main_frame.select_option(**params)

    async def set_input_files(
        self,
        selector: str,
        files: Union[str, Path, FilePayload, List[Union[str, Path]],
                     List[FilePayload]],
        timeout: float = None,
        noWaitAfter: bool = None,
    ) -> None:
        return await self._main_frame.set_input_files(
            **locals_to_params(locals()))

    async def type(
        self,
        selector: str,
        text: str,
        delay: float = None,
        timeout: float = None,
        noWaitAfter: bool = None,
    ) -> None:
        return await self._main_frame.type(**locals_to_params(locals()))

    async def press(
        self,
        selector: str,
        key: str,
        delay: float = None,
        timeout: float = None,
        noWaitAfter: bool = None,
    ) -> None:
        return await self._main_frame.press(**locals_to_params(locals()))

    async def check(
        self,
        selector: str,
        timeout: float = None,
        force: bool = None,
        noWaitAfter: bool = None,
    ) -> None:
        return await self._main_frame.check(**locals_to_params(locals()))

    async def uncheck(
        self,
        selector: str,
        timeout: float = None,
        force: bool = None,
        noWaitAfter: bool = None,
    ) -> None:
        return await self._main_frame.uncheck(**locals_to_params(locals()))

    async def wait_for_timeout(self, timeout: float) -> None:
        await self._main_frame.wait_for_timeout(timeout)

    async def wait_for_function(
        self,
        expression: str,
        arg: Serializable = None,
        timeout: float = None,
        polling: Union[float, Literal["raf"]] = None,
    ) -> JSHandle:
        return await self._main_frame.wait_for_function(
            **locals_to_params(locals()))

    @property
    def workers(self) -> List["Worker"]:
        return self._workers.copy()

    async def pause(self) -> None:
        await self._browser_context._pause()

    async def pdf(
        self,
        scale: float = None,
        displayHeaderFooter: bool = None,
        headerTemplate: str = None,
        footerTemplate: str = None,
        printBackground: bool = None,
        landscape: bool = None,
        pageRanges: str = None,
        format: str = None,
        width: Union[str, float] = None,
        height: Union[str, float] = None,
        preferCSSPageSize: bool = None,
        margin: PdfMargins = None,
        path: Union[str, Path] = None,
    ) -> bytes:
        params = locals_to_params(locals())
        if "path" in params:
            del params["path"]
        encoded_binary = await self._channel.send("pdf", params)
        decoded_binary = base64.b64decode(encoded_binary)
        if path:
            with open(path, "wb") as fd:
                fd.write(decoded_binary)
        return decoded_binary

    @property
    def video(self, ) -> Optional[Video]:
        context_options = self._browser_context._options
        if "recordVideo" not in context_options:
            return None
        if not self._video:
            self._video = Video(self)
            if "videoRelativePath" in self._initializer:
                self._video._set_relative_path(
                    self._initializer["videoRelativePath"])
        return self._video

    def expect_event(
        self,
        event: str,
        predicate: Callable = None,
        timeout: float = None,
    ) -> EventContextManagerImpl:
        if timeout is None:
            timeout = self._timeout_settings.timeout()
        wait_helper = WaitHelper(self, f"page.expect_event({event})")
        wait_helper.reject_on_timeout(
            timeout, f'Timeout while waiting for event "{event}"')
        if event != Page.Events.Crash:
            wait_helper.reject_on_event(self, Page.Events.Crash,
                                        Error("Page crashed"))
        if event != Page.Events.Close:
            wait_helper.reject_on_event(self, Page.Events.Close,
                                        Error("Page closed"))
        wait_helper.wait_for_event(self, event, predicate)
        return EventContextManagerImpl(wait_helper.result())

    def expect_console_message(
        self,
        predicate: Callable[[ConsoleMessage], bool] = None,
        timeout: float = None,
    ) -> EventContextManagerImpl[ConsoleMessage]:
        return self.expect_event(Page.Events.Console, predicate, timeout)

    def expect_download(
        self,
        predicate: Callable[[Download], bool] = None,
        timeout: float = None,
    ) -> EventContextManagerImpl[Download]:
        return self.expect_event(Page.Events.Download, predicate, timeout)

    def expect_file_chooser(
        self,
        predicate: Callable[[FileChooser], bool] = None,
        timeout: float = None,
    ) -> EventContextManagerImpl[FileChooser]:
        return self.expect_event(Page.Events.FileChooser, predicate, timeout)

    def expect_navigation(
        self,
        url: URLMatch = None,
        wait_until: DocumentLoadState = None,
        timeout: float = None,
    ) -> EventContextManagerImpl[Response]:
        return self.main_frame.expect_navigation(url, wait_until, timeout)

    def expect_popup(
        self,
        predicate: Callable[["Page"], bool] = None,
        timeout: float = None,
    ) -> EventContextManagerImpl["Page"]:
        return self.expect_event(Page.Events.Popup, predicate, timeout)

    def expect_request(
        self,
        url_or_predicate: URLMatchRequest,
        timeout: float = None,
    ) -> EventContextManagerImpl[Request]:
        matcher = None if callable(url_or_predicate) else URLMatcher(
            url_or_predicate)
        predicate = url_or_predicate if callable(url_or_predicate) else None

        def my_predicate(request: Request) -> bool:
            if matcher:
                return matcher.matches(request.url)
            if predicate:
                return url_or_predicate(request)
            return True

        return self.expect_event(Page.Events.Request,
                                 predicate=my_predicate,
                                 timeout=timeout)

    def expect_response(
        self,
        url_or_predicate: URLMatchResponse,
        timeout: float = None,
    ) -> EventContextManagerImpl[Response]:
        matcher = None if callable(url_or_predicate) else URLMatcher(
            url_or_predicate)
        predicate = url_or_predicate if callable(url_or_predicate) else None

        def my_predicate(response: Response) -> bool:
            if matcher:
                return matcher.matches(response.url)
            if predicate:
                return predicate(response)
            return True

        return self.expect_event(Page.Events.Response,
                                 predicate=my_predicate,
                                 timeout=timeout)

    def expect_worker(
        self,
        predicate: Callable[["Worker"], bool] = None,
        timeout: float = None,
    ) -> EventContextManagerImpl["Worker"]:
        return self.expect_event("worker", predicate, timeout)
Exemplo n.º 4
0
 def video(self, ) -> Optional[Video]:
     if not self._video:
         self._video = Video(self)
     return self._video