WTL之修改对话框背景和文字颜色的类

/*
* 编写: GUO 
* QQ:349384061
* 用法
* 1.让对话框类公有继承本类
* 2.在对话框类的消息映射宏后面添加消映射链 CHAIN_MSG_MAP(CPaintColor)
* 3.本类只是简单的演示,可在此基础上扩展
*/
template <class T>    //T 为派生的对话框类
class CPaintColor : public CMessageMap
{
public:
    CBrush        m_brushBkgnd;    //背景色,
    COLORREF    m_clrText;        //文字颜色
public:
    CPaintColor(COLORREF clrText = RGB(0,0,255))
    {
        //默认颜色
        m_brushBkgnd.CreateSolidBrush(::GetSysColor(COLOR_BTNFACE));
        m_clrText = clrText;
    }
    ~CPaintColor()
    {
        if (m_brushBkgnd.m_hBrush != NULL)
            m_brushBkgnd.DeleteObject();
    }

    BEGIN_MSG_MAP(CPaintColor)
        MESSAGE_HANDLER(WM_ERASEBKGND,OnEraseBkgnd)
        MESSAGE_HANDLER(WM_CTLCOLORSTATIC, OnCtlColorDlg)
        MESSAGE_HANDLER(WM_CTLCOLORDLG, OnCtlColorDlg)
        MESSAGE_HANDLER(WM_CTLCOLOREDIT, OnCtlColorDlg)
        MESSAGE_HANDLER(WM_CTLCOLORBTN, OnCtlColorDlg)
        MESSAGE_HANDLER(WM_CTLCOLORMSGBOX, OnCtlColorDlg)
        MESSAGE_HANDLER(WM_CTLCOLORLISTBOX, OnCtlColorDlg)
    END_MSG_MAP()

    //创建背景颜色画刷,也可以另外扩展以位图的方式
    HBRUSH CreateSolidBrush(COLORREF crColor)
    {
        if (m_brushBkgnd.m_hBrush != NULL)
            m_brushBkgnd.DeleteObject();
        m_brushBkgnd.CreateSolidBrush(crColor);
        return m_brushBkgnd.m_hBrush;
    }
    //设置文字颜色,并返回旧的颜色
    COLORREF SetTextColor(COLORREF clrText)
    {
        COLORREF clrTextOld = m_clrText;
        m_clrText = clrText;
        return clrTextOld;
    }

protected:
    LRESULT OnEraseBkgnd(UINT uMsg,WPARAM wParam,LPARAM lParam,BOOL &bHandled)
    {
        T* pThis = static_cast<T*>(this);
        HDC hDc = (HDC)wParam;
        RECT rcRect;
        pThis->GetClientRect(&rcRect);
        FillRect(hDc,&rcRect,m_brushBkgnd);
        return 1;
    }

    LRESULT OnCtlColorDlg(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        // TODO: 在此添加消息处理程序代码和/或调用默认值
        HDC hDc = (HDC)wParam;
        switch (uMsg)
        {
        case WM_CTLCOLORSTATIC:
        case WM_CTLCOLORBTN:
        case WM_CTLCOLORMSGBOX:
        case WM_CTLCOLORLISTBOX:
            {
                ::SetBkMode(hDc,TRANSPARENT);
                ::SetTextColor(hDc,m_clrText);
                bHandled = TRUE;
                return (LRESULT)m_brushBkgnd.m_hBrush;
            }
            break;
        case WM_CTLCOLORDLG:
        case WM_CTLCOLOREDIT:
        default:
            break;
        }
        return 0;
    }
};