点击正在执行的进度条时，进度条停滞

Question

visual studio 2010 MFC在进行数据处理时，弹出进度条，
用鼠标点击进度条上端的可拖动位置，按住左键不动时，或来回拖动时，
进度条停滞不动，松开鼠标左键，才恢复运行。求教，鼠标拖动操作不影响进度条进行的方法。

Answer 1

下面是进度条部分的代码BOOL CProgressWnd::Create(CWnd* pParent, LPCTSTR pszTitle, BOOL bSmooth )
{
    BOOL bSuccess;    // Register window class
    CString csClassName = AfxRegisterWndClass(CS_OWNDC|CS_HREDRAW|CS_VREDRAW,
                                              ::LoadCursor(NULL, IDC_APPSTARTING),
                                              CBrush(::GetSysColor(COLOR_BTNFACE)));    // Get the system window message font for use in the cancel button and text area
    NONCLIENTMETRICS ncm;
    ncm.cbSize = sizeof(NONCLIENTMETRICS);
    VERIFY(SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(NONCLIENTMETRICS), &ncm, 0));
    m_font.CreateFontIndirect(&(ncm.lfMessageFont));     // If no parent supplied then try and get a pointer to it anyway
    if (!pParent)
        pParent = AfxGetMainWnd();

    // Create popup window
    bSuccess = CreateEx(WS_EX_DLGMODALFRAME|WS_EX_TOPMOST, // Extended style
                        csClassName,                       // Classname
                        pszTitle,                          // Title
                        WS_POPUP|WS_BORDER|WS_CAPTION,     // style
                        0,0,                               // position - updated soon.
                        390,130,                           // Size - updated soon
                        pParent->GetSafeHwnd(),            // handle to parent
                        0,                                 // No menu
                        NULL);    
    if (!bSuccess) return FALSE;    // Now create the controls
    CRect TempRect(0,0,10,10);    bSuccess = m_Text.Create(_T(""), WS_CHILD|WS_VISIBLE|SS_NOPREFIX|SS_LEFTNOWORDWRAP,
                             TempRect, this, IDC_TEXT);
    if (!bSuccess)return FALSE;    DWORD dwProgressStyle = WS_CHILD|WS_VISIBLE;
#ifdef PBS_SMOOTH    
    if (bSmooth)dwProgressStyle |= PBS_SMOOTH;
#endif
    bSuccess = m_wndProgress.Create(dwProgressStyle, TempRect, this, IDC_PROGRESS);
    if (!bSuccess) return FALSE;    bSuccess = m_CancelButton.Create(m_strCancelLabel, 
                                     WS_CHILD|WS_VISIBLE|WS_TABSTOP| BS_PUSHBUTTON, 
                                     TempRect, this, IDC_CANCEL);
    if (!bSuccess) return FALSE;    m_CancelButton.SetFont(&m_font, TRUE);
    m_Text.SetFont(&m_font, TRUE);    // Resize the whole thing according to the number of text lines, desired window
    // width and current font.
    SetWindowSize(m_nNumTextLines, 390);    // Center and show window
    if (m_bPersistantPosition)
        GetPreviousSettings();
    else
        CenterWindow();    Show();

    return TRUE;
}