DrawEdge

   DrawEdge通常用来画边筐

    RAISEDINNER表示画凹进型边框,

   DrawEdge(Canvas.Handle, r, BDR_RAISEDINNER, BF_RIGHT);
    DrawEdge(Canvas.Handle, r, BDR_RAISEDINNER, BF_TOP);
    DrawEdge(Canvas.Handle, r, BDR_RAISEDINNER, BF_LEFT);
    DrawEdge(Canvas.Handle, r, BDR_RAISEDINNER, BF_BOTTOM);

   SUNKENOUTER表示向外图出型边筐

   DrawEdge(Canvas.Handle, r, BDR_SUNKENOUTER, BF_RIGHT);
    DrawEdge(Canvas.Handle, r, BDR_SUNKENOUTER, BF_TOP);
    DrawEdge(Canvas.Handle, r, BDR_SUNKENOUTER, BF_LEFT);
    DrawEdge(Canvas.Handle, r, BDR_SUNKENOUTER, BF_BOTTOM); }

 SUNKENINNER  只画向BF_LEFT,BF_TOP类型的线条

    DrawEdge(Canvas.Handle, r, BDR_SUNKENINNER, BF_TOP);
    DrawEdge(Canvas.Handle, r, BDR_SUNKENINNER, BF_LEFT);