MFC的MoveWindow(int X, int Y, int Width,int Height,FALSE)导致闪烁问题

Question

我对 MFC(VC++) MoveWindow() 方法有问题，我的规格是：

• .net Runtime 3.5
• VS 2008
• Windows XP

我通过 MoveWindow() 方法显示图像，它首先显示图像，然后根据传递的参数调整它。调整期间会出现轻微（可见）闪烁效果。我猜测这个问题是由于 MoveWindow 方法造成的。请建议我有什么问题。如果您需要更多信息，请告诉我。

** 代码更新于：2011 年 9 月 7 日

void CTMLead::ResizeWndToRatio(float fHeight, float fWidth)
{
    CPoint  TopLeft;
    float   Width;
    float   Height;
    float   Ratio;
    int     Cx;
    int     Cy;
    CString tempFileName;
    tempFileName = m_strFilename;

    //  Should we use the current window dimensions?
    if((fHeight <= 0) || (fWidth <= 0))
    {
        fHeight = (float)m_iHeight;
        fWidth = (float)m_iWidth;
    }
    ASSERT((fHeight > 0) && (fWidth > 0));
    if((fHeight <= 0) || (fWidth <= 0)) return;

    //  Compute the aspect ratio of the current viewport
    Ratio = fHeight / fWidth;

    //  Find the center point of the maximum viewing area
    Cx = (m_rcMax.right / 2) + m_rcMax.left;
    Cy = (m_rcMax.bottom / 2) + m_rcMax.top;

    //  If we use the maximum width allowed, is the height still small
    //  enough to fit on the screen?
    if((m_rcMax.right * Ratio) < m_rcMax.bottom)
    {
        //  Use the full width allowed and adjust the height
        Width  = (float)m_rcMax.right;
        Height = Width * Ratio;
    }
    else
    {   
        //  Use the maximum height available and adjust the width
        Height = (float)m_rcMax.bottom;
        Width = Height / Ratio;
    }

    //  Calculate the new coordinates of the upper left corner
    TopLeft.x = Cx - (ROUND(Width) / 2);
    TopLeft.y = Cy - (ROUND(Height) / 2);

    //  Update the size and offset
    m_iLeft   = TopLeft.x;
    m_iTop    = TopLeft.y;
    m_iWidth  = ROUND(Width);
    m_iHeight = ROUND(Height);

    m_fImageWidth=m_iWidth; 
    m_fImageHeight=m_iHeight;
    SetDstRect(0.0f, 0.0f, m_fImageWidth, m_fImageHeight);

    MoveWindow  (m_iLeft, m_iTop, m_iWidth, m_iHeight, FALSE );
}

谢谢，

Ali

Answer 1

您是否多次使用 MoveWindow 还是只想调整一次大小？这张图是你自己画的吗？如果是的话，您可以自己使用双缓冲来减少闪烁。否则，尝试使用 WM_CLIPSIBLINGS 和 WM_CLIPCHILDREN，有时这也有帮助。如果您多次或多个窗口调整大小而出现问题，请使用 BeginDeferWindowPos()。