北京大学：《组件技术》课程教学资源（讲义课件）第十二讲 软件设计模式（一）

图元基类 class CDrawObj: public CObject ∥ Attributes CDrawDoc*m pDocument;//owner virtual int GetHandle) virtual CPoint Get Handle(int nHandle) virtual HCURSOR Get Handle Cursor(int n Handle virtual void SetLine Color(COLORREF color) virtual void Set Fill Color(COLORREF color) ∥ Operations virtual void Draw(CDC pDC) virtual void Draw Tracker(CDC* pDC, Tracker State state) virtual void Move To(const CRect& positon, CDraw View"pView= NULL); virtual int HitTest( CPoint point, CDraw View*pView, BOOL bSelected); virtual BOOL Intersects( const CRect& rect) virtual void Move HandleTo(int nHandle, CPoint point, CDraw View*p View=NULL) virtual void OnOpen( CDraw View* p View) virtual void OnEditPropertiesO virtual CDrawObj* Clone( CDraw Doc* p= NULL) virtual void Removel virtual void Serialize( CArchive& ar) };


  
 
    

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图元层次结构 CDrawObj CDrawobj CDrawRect CDrawPoly CDrawDleobj cDrawRect CDrawPoly CDrawsspt-

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图元的创建 永久支持: CDocument: Serialize->CObList. Serialize cObject. Serialize CDrawObj: Clone Draw tool:创建图元对象

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交互操作 键盘和菜单侖令 MFC内部机制 鼠标操作 在 CDraw View的鼠标处理函数中处理 工具箱:工具链,有一个当前活动工具 转交给当前活动工具来处理

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工具箱和 CDraw tool class CDraw Tool ∥ Constructors p CDraw Tool ( Draw Shape n DrawShape) ∥ Overridable virtual void OnLButton Down( CDraw View* pView, UINT nFlags, const CPoint& point) virtual void OnLButtonDblClk(CDraw View*pView, UINT nFlags, const CPoint& point) virtual void OnLButtonUp(CDraw View* pView, UINT nFlags, const CPoint& point virtual void On MouseMove( CDraw View* pView, UINT n Flags, const CPoint& point virtual void OnEditProperties( CDraw View'pView) virtual void On Cancell ∥ Attributes Draw Shape m draw Shape static CDraw Tool* FindTool(Draw Shape drawShape) static CPtrList c tools static Draw Shape c draw Shape



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