scrollbar.h

brew平台下scrollbar控件的实现算法。 scrollbar采用图片背景

#ifndef _SCROLLBAR_H
#define _SCROLLBAR_H

#define SCROLLBAR_WIDTH 10
#define SLIP_WIDTH 6

typedef struct ScrollBar
{
	IShell   *pIShell;
	IDisplay *pIDisplay;

	uint32   nLength;
	uint32   nStep;
	uint32   nPos;
//	uint32   nSlipLength;

	AEERect  m_rcRect;

	IImage  *pScrlImg;
	IImage  *pSlpImg;

} ScrollBar;

extern int Scrollbar_New(uint16 nSize, IShell *pIShell, ScrollBar **ppo);

extern boolean Scrollbar_HandleEvent(ScrollBar* pMe, AEEEvent eCode, 
									 uint16 wParam, uint32 dwParam);
extern boolean ScrollBar_Redraw(ScrollBar* pMe);
extern boolean Scrollbar_InitData(ScrollBar *po);
// 删除ScrollBar
extern void ScrollBar_Reset(ScrollBar *po);

extern void ScrollBar_SetLength(ScrollBar *po, uint32 nLength);
extern void ScrollBar_SetStep(ScrollBar *po, uint32 nStep);
extern void ScrollBar_SetPos(ScrollBar *po, uint32 nPos);
extern uint32 ScrollBar_GetLength(ScrollBar *po);
extern uint32 ScrollBar_GetStep(ScrollBar *po);
extern uint32 ScrollBar_GetPos(ScrollBar *po);
extern void ScrollBar_SetRect(ScrollBar *po, const AEERect *prc);
extern void ScrollBar_GetRect(ScrollBar *po, AEERect *prc);

extern void ScrollBar_StepIt(ScrollBar *po, boolean bDown);

#endif