Method SetUIMessageBroker

BrowserWindow.cpp:327–476

Set the message broker for the UI webview. This will capture messages from ui web content. Lambda is used to capture the instance while satisfying Microsoft::WRL::Callback ()

// Set the message broker for the UI webview. This will capture messages from ui web content.
// Lambda is used to capture the instance while satisfying Microsoft::WRL::Callback<T>()
void BrowserWindow::SetUIMessageBroker()
{
    m_uiMessageBroker = Callback<ICoreWebView2WebMessageReceivedEventHandler>(
        [this](ICoreWebView2* webview, ICoreWebView2WebMessageReceivedEventArgs* eventArgs) -> HRESULT
    {
        wil::unique_cotaskmem_string jsonString;
        CheckFailure(eventArgs->get_WebMessageAsJson(&jsonString), L"");  // Get the message from the UI WebView as JSON formatted string
        web::json::value jsonObj = web::json::value::parse(jsonString.get());

        if (!jsonObj.has_field(L"message"))
        {
            OutputDebugString(L"No message code provided\n");
            return S_OK;
        }

        if (!jsonObj.has_field(L"args"))
        {
            OutputDebugString(L"The message has no args field\n");
            return S_OK;
        }

        int message = jsonObj.at(L"message").as_integer();
        web::json::value args = jsonObj.at(L"args");

        switch (message)
        {
        case MG_CREATE_TAB:
        {
            size_t id = args.at(L"tabId").as_number().to_uint32();
            bool shouldBeActive = args.at(L"active").as_bool();
            std::unique_ptr<Tab> newTab = Tab::CreateNewTab(m_hWnd, m_contentEnv.Get(), id, shouldBeActive);

            std::map<size_t, std::unique_ptr<Tab>>::iterator it = m_tabs.find(id);
            if (it == m_tabs.end())
            {
                m_tabs.insert(std::pair<size_t,std::unique_ptr<Tab>>(id, std::move(newTab)));
            }
            else
            {
                m_tabs.at(id)->m_contentController->Close();
                it->second = std::move(newTab);
            }
        }
        break;
        case MG_NAVIGATE:
        {
            std::wstring uri(args.at(L"uri").as_string());
            std::wstring browserScheme(L"browser://");

            if (uri.substr(0, browserScheme.size()).compare(browserScheme) == 0)
            {
                // No encoded search URI
                std::wstring path = uri.substr(browserScheme.size());
                if (path.compare(L"favorites") == 0 ||
                    path.compare(L"settings") == 0 ||
                    path.compare(L"history") == 0)
                {
                    std::wstring filePath(L"wvbrowser_ui\\content_ui\\");