Function ShowProgressWindow

Rtxpt/SampleCommon/SampleCommon.cpp:225–316

#endif

void ShowProgressWindow(int slotIndex)
{
#ifdef _WIN32
    ProgressBarGlobals & slot = g_ProgressSlots[slotIndex];

    const char* wClassName = "ProgressWindowClass";
    HINSTANCE hInstance = GetModuleHandle(NULL);
    static std::mutex   registerClassMtx;
    static bool         registerClassFlag = false;
    {
        std::lock_guard<std::mutex> lock(registerClassMtx);
        if (!registerClassFlag)
        {
            INITCOMMONCONTROLSEX icex = { sizeof(INITCOMMONCONTROLSEX), ICC_PROGRESS_CLASS };
            InitCommonControlsEx(&icex);
            WNDCLASS wc = {};
            wc.lpfnWndProc = ProgressWndProc;
            wc.hInstance = hInstance;
            wc.lpszClassName = wClassName;
            wc.hCursor = LoadCursor(NULL, IDC_ARROW);

            if (!RegisterClass(&wc))
                ShowLastError();
            registerClassFlag = true;
        }
    }

    int width = 600;
    int height = 100;

    // Default position if no parent
    int x = CW_USEDEFAULT;
    int y = CW_USEDEFAULT;

    HWND hParent = g_hActiveParentWindow.load();
    HWND hwnd = NULL;
    {
        std::lock_guard guard(slot.Mutex);
        if (!slot.Active) // already finished? don't even open the window
            return;

        if (hParent) 
        {
            RECT parentRect;
            GetWindowRect(hParent, &parentRect);

            x = parentRect.left + (parentRect.right - parentRect.left - width) / 2;
            y = parentRect.top + (parentRect.bottom - parentRect.top - height*3) / 2;
            y += height * slotIndex;
        }

        slot.hMainWindow = CreateWindowEx( WS_EX_TOOLWINDOW, wClassName, slot.Title.c_str(),
            WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU, x, y, width, height,
            NULL/*hParent*/, NULL, hInstance, reinterpret_cast<LPVOID>(&slot));
        // can't use hParent as a parent because that ties our child window to using the main thread's message loop - not sure what the proper solution is here

        if (slot.hMainWindow == NULL)
        {