Method ViewComponent

SampleApps/WebView2APISample/ViewComponent.cpp:37–214

};

ViewComponent::ViewComponent(
    AppWindow* appWindow, IDCompositionDevice* dcompDevice,
    winrtComp::Compositor wincompCompositor, bool isDcompTargetMode)
    : m_appWindow(appWindow), m_controller(appWindow->GetWebViewController()),
      m_webView(appWindow->GetWebView()), m_dcompDevice(dcompDevice),
      m_wincompCompositor(wincompCompositor), m_isDcompTargetMode(isDcompTargetMode)
{
    //! [ZoomFactorChanged]
    // Register a handler for the ZoomFactorChanged event.
    // This handler just announces the new level of zoom on the window's title bar.
    CHECK_FAILURE(m_controller->add_ZoomFactorChanged(
        Callback<ICoreWebView2ZoomFactorChangedEventHandler>(
            [this](ICoreWebView2Controller* sender, IUnknown* args) -> HRESULT {
                double zoomFactor;
                CHECK_FAILURE(sender->get_ZoomFactor(&zoomFactor));

                UpdateDocumentTitle(m_appWindow, L" (Zoom: ", zoomFactor);
                return S_OK;
            })
        .Get(),
                &m_zoomFactorChangedToken));
    //! [ZoomFactorChanged]

    CHECK_FAILURE(m_webView->add_NavigationStarting(
        Callback<ICoreWebView2NavigationStartingEventHandler>(
            [this](ICoreWebView2* sender, ICoreWebView2NavigationStartingEventArgs* args)
            -> HRESULT {
                wil::unique_cotaskmem_string newUri;
                CHECK_FAILURE(args->get_Uri(&newUri));

                wil::unique_cotaskmem_string oldUri;
                CHECK_FAILURE(m_webView->get_Source(&oldUri));

                std::wstring appStartPage = AppStartPage::GetUri(m_appWindow);
                size_t queryIndex = appStartPage.find('?');

                if (appStartPage.compare(0, queryIndex, newUri.get(), queryIndex) == 0)
                {
                    // When navigating to the app start page, make the background of
                    // the html be the WebView2 logo. We do this by making
                    // the background color transparent so the WebView2 logo in the AppWindow
                    // shows through.
                    COREWEBVIEW2_COLOR transparentColor = {0, 0, 0, 0};
                    wil::com_ptr<ICoreWebView2Controller2> controller2 =
                        m_controller.query<ICoreWebView2Controller2>();
                    // Save the previous background color to restore when navigating away.
                    CHECK_FAILURE(controller2->get_DefaultBackgroundColor(&m_webViewColor));
                    CHECK_FAILURE(controller2->put_DefaultBackgroundColor(transparentColor));
                }
                else if (appStartPage.compare(0, queryIndex, oldUri.get(), queryIndex) == 0)
                {
                    // When navigating away from the app start page, set the background color
                    // back to the previous value. If the user changed the background color,
                    // m_webViewColor will have changed.
                    wil::com_ptr<ICoreWebView2Controller2> controller2 =
                        m_controller.query<ICoreWebView2Controller2>();
                    CHECK_FAILURE(controller2->put_DefaultBackgroundColor(m_webViewColor));
                }