BCB TStringGrid之ScrollBar自動捲動方式

在BCB中若要使TStringGrid程式控制上下捲動，我在網路上找了很久，可用下列function來達成

SendMessage(TStringGrid->Handle, WM_VSCROLL, SB_LINEDOWN, 0);

主要可變動的參數式SB_LINEDOWN，有以下選擇

SB_BOTTOM 

  Scrolls   to   the   lower   right. 

SB_ENDSCROLL 

  Ends   scroll. 

SB_LINEDOWN 

  Scrolls   one   line   down. 

SB_LINEUP 

  Scrolls   one   line   up. 

SB_PAGEDOWN 

  Scrolls   one   page   down. 

SB_PAGEUP 

  Scrolls   one   page   up. 

SB_THUMBPOSITION 

  The   user   has   dragged   the   scroll   box   (thumb)   and   released   the   mouse   button.   The   high-order   word   indicates   the   position   of   the   scroll   box   at   the   end   of   the   drag   operation. 

SB_THUMBTRACK 

  The   user   is   dragging   the   scroll   box.   This   message   is   sent   repeatedly   until   the   user   releases   the   mouse   button.   The   high-order   word   indicates   the   position   that   the   scroll   box   has   been   dragged   to. 

SB_TOP 

  Scrolls   to   the   upper   left.