static LRESULT CALLBACK WndProc()

in Tools/msi/bundle/bootstrap/PythonBootstrapperApplication.cpp [1853:1986]

• 111 lines of code
• 45 McCabe index (conditional complexity)

    static LRESULT CALLBACK WndProc(
        __in HWND hWnd,
        __in UINT uMsg,
        __in WPARAM wParam,
        __in LPARAM lParam
    ) {
#pragma warning(suppress:4312)
        auto pBA = reinterpret_cast<PythonBootstrapperApplication*>(::GetWindowLongPtrW(hWnd, GWLP_USERDATA));

        switch (uMsg) {
        case WM_NCCREATE: {
            LPCREATESTRUCT lpcs = reinterpret_cast<LPCREATESTRUCT>(lParam);
            pBA = reinterpret_cast<PythonBootstrapperApplication*>(lpcs->lpCreateParams);
#pragma warning(suppress:4244)
            ::SetWindowLongPtrW(hWnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(pBA));
            break;
        }

        case WM_NCDESTROY: {
            LRESULT lres = ThemeDefWindowProc(pBA ? pBA->_theme : nullptr, hWnd, uMsg, wParam, lParam);
            ::SetWindowLongPtrW(hWnd, GWLP_USERDATA, 0);
            return lres;
        }

        case WM_CREATE: 
            if (!pBA->OnCreate(hWnd)) {
                return -1;
            }
            break;

        case WM_QUERYENDSESSION:
            return IDCANCEL != pBA->OnSystemShutdown(static_cast<DWORD>(lParam), IDCANCEL);

        case WM_CLOSE:
            // If the user chose not to close, do *not* let the default window proc handle the message.
            if (!pBA->OnClose()) {
                return 0;
            }
            break;

        case WM_DESTROY:
            ::PostQuitMessage(0);
            break;

        case WM_PAINT: __fallthrough;
        case WM_ERASEBKGND:
            if (pBA && pBA->_suppressPaint) {
                return TRUE;
            }
            break;

        case WM_PYBA_SHOW_HELP:
            pBA->OnShowHelp();
            return 0;

        case WM_PYBA_DETECT_PACKAGES:
            pBA->OnDetect();
            return 0;

        case WM_PYBA_PLAN_PACKAGES:
            pBA->OnPlan(static_cast<BOOTSTRAPPER_ACTION>(lParam));
            return 0;

        case WM_PYBA_APPLY_PACKAGES:
            pBA->OnApply();
            return 0;

        case WM_PYBA_CHANGE_STATE:
            pBA->OnChangeState(static_cast<PYBA_STATE>(lParam));
            return 0;

        case WM_PYBA_SHOW_FAILURE:
            pBA->OnShowFailure();
            return 0;

        case WM_COMMAND:
            switch (LOWORD(wParam)) {
            // Customize commands
            // Success/failure commands
            case ID_SUCCESS_RESTART_BUTTON: __fallthrough;
            case ID_FAILURE_RESTART_BUTTON:
                pBA->OnClickRestartButton();
                return 0;

            case IDCANCEL: __fallthrough;
            case ID_INSTALL_CANCEL_BUTTON: __fallthrough;
            case ID_CUSTOM1_CANCEL_BUTTON: __fallthrough;
            case ID_CUSTOM2_CANCEL_BUTTON: __fallthrough;
            case ID_MODIFY_CANCEL_BUTTON: __fallthrough;
            case ID_PROGRESS_CANCEL_BUTTON: __fallthrough;
            case ID_SUCCESS_CANCEL_BUTTON: __fallthrough;
            case ID_FAILURE_CANCEL_BUTTON: __fallthrough;
            case ID_CLOSE_BUTTON:
                pBA->OnCommand(ID_CLOSE_BUTTON);
                return 0;

            default:
                pBA->OnCommand((CONTROL_ID)LOWORD(wParam));
            }
            break;

        case WM_NOTIFY:
            if (lParam) {
                LPNMHDR pnmhdr = reinterpret_cast<LPNMHDR>(lParam);
                switch (pnmhdr->code) {
                case NM_CLICK: __fallthrough;
                case NM_RETURN:
                    switch (static_cast<DWORD>(pnmhdr->idFrom)) {
                    case ID_FAILURE_LOGFILE_LINK:
                        pBA->OnClickLogFileLink();
                        return 1;
                    }
                }
            }
            break;

        case WM_CTLCOLORSTATIC:
        case WM_CTLCOLORBTN:
            if (pBA) {
                HBRUSH brush = nullptr;
                if (pBA->SetControlColor((HWND)lParam, (HDC)wParam, &brush)) {
                    return (LRESULT)brush;
                }
            }
            break;
        }

        if (pBA && pBA->_taskbarList && uMsg == pBA->_taskbarButtonCreatedMessage) {
            pBA->_taskbarButtonOK = TRUE;
            return 0;
        }

        return ThemeDefWindowProc(pBA ? pBA->_theme : nullptr, hWnd, uMsg, wParam, lParam);
    }