用VC++制作播放AVI视频流的动画按钮(3)

BEGIN_MESSAGE_MAP(CAviButton, CButton)
　//{{AFX_MSG_MAP(CAviButton)
　　ON_WM_MOUSEMOVE()
　//}}AFX_MSG_MAP
END_MESSAGE_MAP()

///////////////////// CAviButton message handlers
void CAviButton::DrawButton(CDC *pDC, UINT nState, CRect rect)
{
　COLORREF upCol,downCol,edgeCol;
　edgeCol=RGB(0,0,0); //设置按钮边缘的初始化颜色；
　if ((nState & ODS_SELECTED) == ODS_SELECTED)
　{
　　//设置按钮被按下时按钮的颜色
　　upCol=RGB(0,0,0);
　　edgeCol=RGB(128,128,128);
　　downCol=RGB(0,0,0);
　}
　else
　{
　　//设置按钮正常时按钮的颜色
　　upCol=RGB(255,255,255);
　　downCol=RGB(128,128,128);
　}
　CPen* pOldPen = NULL;
　BOOL pen1Created;
　CPen pen1;
　BOOL pen2Created;
　CPen pen2;
　if (pen1Created = pen1.CreatePen(PS_SOLID, 1, upCol))
　　pOldPen = pDC->SelectObject( &pen1 );
　　//画左上边缘
　pDC->MoveTo(1,rect.Height()-1);
　pDC->LineTo(1,1);
　pDC->LineTo(rect.Width()-1,1);
　pDC->MoveTo(0,rect.Height()-1);
　pDC->LineTo(0,0);
　pDC->LineTo(rect.Width()-1,0);
　if (pen2Created = pen2.CreatePen(PS_SOLID, 1, downCol))
　　pDC->SelectObject( &pen2 );
　if (pen1Created)
　{
　　pen1.DeleteObject();
　　pen1Created = FALSE;
　}
　//画右下边缘
　pDC->MoveTo(rect.Width()-1,0);
　pDC->LineTo(rect.Width()-1,rect.Height()-1);
　pDC->LineTo(0,rect.Height()-1);
　pDC->MoveTo(rect.Width()-2,1);
　pDC->LineTo(rect.Width()-2,rect.Height()-2);
　pDC->LineTo(0,rect.Height()-2);
　if (pen2Created)//删除"pen2"画笔对象
　{
　　pen2.DeleteObject();
　　pen2Created = FALSE;
　}
　if (pen1Created = pen1.CreatePen(PS_SOLID, 1, edgeCol))
　　pOldPen = pDC->SelectObject( &pen1 );
　if (pen1Created)
　{
　　pen1.DeleteObject();
　　pen1Created = FALSE;
　}
　if (pOldPen != NULL)
　　pDC->SelectObject( pOldPen );
}