static LRESULT CALLBACK __apxAboutDlgProc()

in src/native/windows/src/gui.c [346:398]
50 lines of code
10 McCabe index (conditional complexity)

static LRESULT CALLBACK __apxAboutDlgProc(HWND hDlg, UINT uMsg,
                                          WPARAM wParam, LPARAM lParam)
{
    static  HWND  hRich = NULL;
    static  POINT ptScroll;
    HRSRC   hRsrc;
    HGLOBAL hGlob;
    LPSTR   szTxt;

    switch (uMsg) {
        case WM_INITDIALOG:
            apxCenterWindow(hDlg, _st_sys_gui.hMainWnd);
            hRich = GetDlgItem(hDlg, IDC_LICENSE);
            hRsrc = FindResource(GetModuleHandleA(NULL), MAKEINTRESOURCE(IDR_LICENSE),
                                 TEXT("RTF"));
            hGlob = LoadResource(GetModuleHandleA(NULL), hRsrc);
            szTxt = (LPSTR)LockResource(hGlob);

            SendMessageA(hRich, WM_SETTEXT, 0, (LPARAM)szTxt);
            SetDlgItemText(hDlg, IDC_ABOUTAPP, apxLoadResourceW(IDS_APPFULLNAME, 0));
            ptScroll.x = 0;
            ptScroll.y = 0;
            return TRUE;
        break;
        case WM_COMMAND:
            if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) {
                EndDialog(hDlg, LOWORD(wParam));
                return TRUE;
            }
            else if (LOWORD(wParam) == IAB_SYSINF)
                __apxShellAbout(hDlg);
        break;
        case WM_MOUSEWHEEL:
            {
                int nScroll, nLines;
                if ((SHORT)HIWORD(wParam) < 0)
                    nScroll = _st_sys_gui.nWhellScroll;
                else
                    nScroll = _st_sys_gui.nWhellScroll * (-1);
                ptScroll.y += (nScroll * 11);
                if (ptScroll.y < 0)
                    ptScroll.y = 0;
                nLines = (int)SendMessage(hRich, EM_GETLINECOUNT, 0, 0) + 1;
                if (ptScroll.y / 11 > nLines)
                    ptScroll.y = nLines * 11;
                SendMessage(hRich, EM_SETSCROLLPOS, 0, (LPARAM)&ptScroll);
            }
        break;

    }
    return FALSE;
	UNREFERENCED_PARAMETER(lParam);
}