Scroll Bar 控件

Structure

 1 typedef struct tagSCROLLINFO {
 2   UINT cbSize; //Sizeof(SCROLLINFO)
 3   UINT fMask; 
 4   int nMin; //minimum scrolling position
 5   int nMax; //maximum scrolling position
 6   UINT nPage; 
 7   int nPos; //position of the scroll box
 8   int nTrackPos; 
 9 } SCROLLINFO; 
10 typedef SCROLLINFO FAR* LPSCROLLINFO;

fMask:需要设置或获取的参数。SIF_ALL、SIF_DISABLENOSCROLL、SIF_PAGE、SIF_POS、SIF_RANGE、SIF_TRACKPOS
nPage:页尺寸。用来设置scroll box的适当尺寸。
nTrackPos:拖动scroll box时的当前位置，对应SB_THUMBTRACK消息

Functions

BOOL GetScrollInfo(HWND hwnd, int fnBar, LPSCROLLINFO lpsi );
int SetScrollInfo(HWND hwnd, int fnBar, LPSCROLLINFO lpsi, BOOL fRedraw ); 
int SetScrollPos(HWND hWnd, int nBar, int nPos, BOOL bRedraw ); 
BOOL SetScrollRange(HWND hWnd, int nBar, int nMinPos, int nMaxPos, BOOL bRedraw ); 
BOOL GetScrollInfo(HWND hwnd, int fnBar, LPSCROLLINFO lpsi ); 
BOOL ScrollDC(
  HDC hDC, 
  int dx, 
  int dy, 
  const RECT* lprcScroll, 
  const RECT* lprcClip, 
  HRGN hrgnUpdate, 
  LPRECT lprcUpdate 
); 
int ScrollWindowEx( 
  HWND hWnd, 
  int dx, 
  int dy, 
  const RECT* prcScroll, 
  const RECT* prcClip, 
  HRGN hrgnUpdate, 
  LPRECT prcUpdate, 
  UINT flags 
);

Messages

WM_HSCROLL:nScrollCode、nPos、hwndScrollBar
WM_VSCROLL