mfc 绘制 圆形按钮 继承CButton

头文件

// MyButton 圆形按钮class MyButton : public CButton{private:bool is_pressed;  //鼠标是否按下public:virtual void PreSubclassWindow();  //修改自绘属性virtual void DrawItem(LPDRAWITEMSTRUCT /*lpDrawItemStruct*/);  //绘制 圆形按钮public:DECLARE_MESSAGE_MAP()afx_msg void OnLButtonDown(UINT nFlags, CPoint point);  //鼠标按下afx_msg void OnLButtonUp(UINT nFlags, CPoint point);  //鼠标松开afx_msg BOOL OnEraseBkgnd(CDC* pDC);  //不擦除背景};

实现文件

// MyButtonvoid MyButton::PreSubclassWindow(){ModifyStyle(0,BS_OWNERDRAW);is_pressed = false;CButton::PreSubclassWindow();}void MyButton::DrawItem(LPDRAWITEMSTRUCT lp){CRect rc = lp->rcItem;CDC dc;dc.Attach(lp->hDC);dc.SetBkMode(TRANSPARENT);CBrush br;br.CreateStockObject(NULL_BRUSH);dc.SelectObject(&br);if (is_pressed){CPen pen(PS_SOLID,2,RGB(255,0,0));dc.SelectObject(&pen);dc.Ellipse(0,0,rc.Width(),rc.Height());dc.SetTextColor(RGB(255,0,0));}else{CPen pen(PS_SOLID,2,RGB(0,255,0));dc.SelectObject(&pen);dc.Ellipse(0,0,rc.Width(),rc.Height());dc.SetTextColor(RGB(0,255,0));}CString str;GetWindowText(str);dc.DrawText(str,CRect(0,0,rc.right,rc.bottom),DT_CENTER | DT_VCENTER | DT_SINGLELINE);dc.DeleteDC();}BEGIN_MESSAGE_MAP(MyButton, CButton)ON_WM_LBUTTONDOWN()ON_WM_LBUTTONUP()ON_WM_ERASEBKGND()END_MESSAGE_MAP()void MyButton::OnLButtonDown(UINT nFlags, CPoint point){is_pressed = true;CButton::OnLButtonDown(nFlags, point);}void MyButton::OnLButtonUp(UINT nFlags, CPoint point){is_pressed = false;CButton::OnLButtonUp(nFlags, point);}BOOL MyButton::OnEraseBkgnd(CDC* pDC){return TRUE;  //不擦除背景}

为 按钮 关联 控件变量，在.h文件中将按钮类型改为MyButton即可。