#if !defined(AFX_DRAGDROPLISTCTRL_H__17F6D56D_591C_4319_B0EB_9D6D9B45BC79__INCLUDED_)
#define AFX_DRAGDROPLISTCTRL_H__17F6D56D_591C_4319_B0EB_9D6D9B45BC79__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif 

class CDragDropListCtrl : public CListCtrl
{
protected:
	// 要被拖动的1个或多个项的索引数组;
	CDWordArray			m_anDragIndexes;	
	// 当前被拖动项替换的项索引;
	int					m_nDropIndex;		
	// 拖动时的图标;
	CImageList*			m_pDragImage;		
	// 上一个索引;
	int					m_nPrevDropIndex;	
	// 上一个状态;
	UINT				m_uPrevDropState;	
	DWORD				m_dwStyle;

	// 保存拖动的起始坐标;
	CPoint m_ptStart;
	// 当前移动的坐标点;
	CPoint m_ptCurr;
	// 移动起始点与当前坐标点间的所有项;
	void MoveDragItem(CPoint ptMove);


	enum EScrollDirection
	{
		scrollNull,
		scrollUp,
		scrollDown
	};
	EScrollDirection	m_ScrollDirection;
	UINT				m_uScrollTimer;

public:
	CDragDropListCtrl();
	bool IsDragging() const { return m_pDragImage != NULL; }

public:

	virtual ~CDragDropListCtrl();

protected:
	void DropItem();
	void DropItem(CPoint pt);
	void RestorePrevDropItemState();
	void UpdateSelection(int nDropIndex);
	void SetScrollTimer(EScrollDirection ScrollDirection);
	void KillScrollTimer();
	CImageList* CreateDragImageEx(LPPOINT lpPoint);

	// 获取点所对应的项矩形;
	int GetPtItemIndex(CPoint pt);
	
protected:
	afx_msg void OnMouseMove(UINT nFlags, CPoint point);
	afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
	afx_msg void OnBeginDrag(NMHDR* pNMHDR, LRESULT* pResult);
	afx_msg void OnTimer(UINT nIDEvent);

	DECLARE_MESSAGE_MAP()
};

#endif