第二章 第四小节Duilib中的COptionUI控件

1.COptionUI控件

  COptionUI控件是duilib中的选项控件，它继承至CButtonUI控件，所以它有CButtonUI的几种状态的切换，  首先查看它支持的属性列表：

//属性展示

		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
		
	

然后分析阅读源码，如下所示：

class UILIB_API COptionUI : public CButtonUI
    {
        DECLARE_DUICONTROL(COptionUI)
    public:
        COptionUI();
        ~COptionUI();

        LPCTSTR GetClass() const;
        LPVOID GetInterface(LPCTSTR pstrName);

        void SetManager(CPaintManagerUI* pManager, CControlUI* pParent, bool bInit = true);

        bool Activate();
        void SetEnabled(bool bEnable = true);

        LPCTSTR GetSelectedImage();
        void SetSelectedImage(LPCTSTR pStrImage);

        LPCTSTR GetSelectedHotImage();
        void SetSelectedHotImage(LPCTSTR pStrImage);

        LPCTSTR GetSelectedPushedImage();
        void SetSelectedPushedImage(LPCTSTR pStrImage);

        void SetSelectedTextColor(DWORD dwTextColor);
        DWORD GetSelectedTextColor();

        void SetSelectedBkColor(DWORD dwBkColor);
        DWORD GetSelectBkColor();

        LPCTSTR GetSelectedForedImage();
        void SetSelectedForedImage(LPCTSTR pStrImage);

        void SetSelectedStateCount(int nCount);
        int GetSelectedStateCount() const;
        virtual LPCTSTR GetSelectedStateImage();
        virtual void SetSelectedStateImage(LPCTSTR pStrImage);

        void SetSelectedFont(int index);
        int GetSelectedFont() const;

        LPCTSTR GetGroup() const;
        void SetGroup(LPCTSTR pStrGroupName = NULL);
        bool IsSelected() const;
        virtual void Selected(bool bSelected, bool bMsg = true);

        void SetAttribute(LPCTSTR pstrName, LPCTSTR pstrValue);

        void PaintBkColor(HDC hDC);
        void PaintStatusImage(HDC hDC);
        void PaintForeImage(HDC hDC);
        void PaintText(HDC hDC);

    protected:
        bool            m_bSelected;//选择状态
        CDuiString        m_sGroupName;//组名

        int                m_iSelectedFont;

        DWORD            m_dwSelectedBkColor;
        DWORD            m_dwSelectedTextColor;

        CDuiString        m_sSelectedImage;
        CDuiString        m_sSelectedHotImage;
        CDuiString        m_sSelectedPushedImage;
        CDuiString        m_sSelectedForeImage;

        int m_nSelectedStateCount;
        CDuiString m_sSelectedStateImage;
    };

  它新增了一个m_sGroupName的组名属性，用这个来区别单选和多选的区别，名字非空就是组内单选，否则就是可以多选，它的事件处理函数与CButtonUI是一致的，点击之后调用Activate函数，源码如下所示：

	bool COptionUI::Activate()
    {
        if( !CButtonUI::Activate() ) return false;//父类点击消息发送
        if( !m_sGroupName.IsEmpty() ) Selected(true);
        else Selected(!m_bSelected);

        return true;
    }
    void COptionUI::Selected(bool bSelected, bool bMsg/* = true*/)
    {
        if(m_bSelected == bSelected) return;

        m_bSelected = bSelected;
        if( m_bSelected ) m_uButtonState |= UISTATE_SELECTED;
        else m_uButtonState &= ~UISTATE_SELECTED;

        if( m_pManager != NULL ) {
            if( !m_sGroupName.IsEmpty() ) {//组名存在，则改变所有同组名其它控件选择状态为false
                if( m_bSelected ) {
                    CStdPtrArray* aOptionGroup = m_pManager->GetOptionGroup(m_sGroupName);
                    for( int i = 0; i GetSize(); i++ ) {
                        COptionUI* pControl = static_cast(aOptionGroup->GetAt(i));
                        if( pControl != this ) {
                            pControl->Selected(false, bMsg);
                        }
                    }
                    if(bMsg) {
                        m_pManager->SendNotify(this, DUI_MSGTYPE_SELECTCHANGED);
                    }
                }
            }
            else {
                if(bMsg) {
                    m_pManager->SendNotify(this, DUI_MSGTYPE_SELECTCHANGED);
                }
            }
        }

        Invalidate();
    }

  COptionUI控件的主要作用是提供单选框、多选框和选项卡中的单选功能，由于它不像win32提供的单选框和多选框那样，提供默认的绘制样式，所以必须提供贴图来展示单选框和多选框的图像。

2.作者答疑

  如有疑问，请留言。