文本编辑框--背景色

可以像静态文本框那样在OnCtlColor中修改文本编辑框的背景色，但是这样会出现一个问题，退格刷新不正常，出现重影。到目前没有找到好的办法解决，最后决定重载文本编辑框，自己处理ON_WM_CTLCOLOR_REFLECT。

派生类代码如下：

///   .h-----------

class CDrawEdit : public CEdit
{
    DECLARE_DYNAMIC(CDrawEdit)

public:
    CDrawEdit();
    virtual ~CDrawEdit();

    void SetBackground(COLORREF cr);
    void SetFontColor(COLORREF cr);

protected:
    DECLARE_MESSAGE_MAP()
public:
    afx_msg HBRUSH CtlColor(CDC* /*pDC*/, UINT /*nCtlColor*/);

protected:
    CBrush   m_brBackground;        //背景画刷
    COLORREF m_crBackground;        //背景色
    COLORREF m_crFont;                //字体颜色
};

 

///   .cpp---------

CDrawEdit::CDrawEdit()
{
    if (m_brBackground.GetSafeHandle())
    {
        m_brBackground.DeleteObject();
    }

    m_crBackground = RGB(255,255,255);
    m_crFont = GetSysColor(COLOR_WINDOWTEXT);

    m_brBackground.CreateSolidBrush(m_crBackground);

}

CDrawEdit::~CDrawEdit()
{
    if (m_brBackground.GetSafeHandle())
    {
        m_brBackground.DeleteObject();
    }
}

 

void CDrawEdit::SetBackground(COLORREF cr)
{
    m_crBackground = cr;

    if (m_brBackground.GetSafeHandle())
    {
        m_brBackground.DeleteObject();
    }

    m_brBackground.CreateSolidBrush(m_crBackground);

    Invalidate(TRUE);
}

void CDrawEdit::SetFontColor(COLORREF cr)
{
    m_crFont = cr;

    Invalidate(TRUE);
}

 

BEGIN_MESSAGE_MAP(CDrawEdit, CEdit)
    ON_WM_CTLCOLOR_REFLECT()
END_MESSAGE_MAP()

 

HBRUSH CDrawEdit::CtlColor(CDC* pDC, UINT nCtlColor)
{
    pDC->SetBkColor(m_crBackground);
    pDC->SetTextColor(m_crFont);

    return m_brBackground;
}