// DragListCtrl.cpp : 实现文件
//

#include "stdafx.h"
//#include "DragListCtrlDemo.h"
#include "DragListCtrl.h"


// CDragListCtrl

IMPLEMENT_DYNAMIC(CDragListCtrl, CListCtrl)

CDragListCtrl::CDragListCtrl()
: m_nSelItem(-1)
, m_bDragging(FALSE)
, m_pDragImageList(NULL)
{

}

CDragListCtrl::~CDragListCtrl()
{
	if (m_pDragImageList)
	{
		delete m_pDragImageList;
		m_pDragImageList = NULL;
	}
}


BEGIN_MESSAGE_MAP(CDragListCtrl, CListCtrl)
	//ON_NOTIFY_REFLECT(LVN_BEGINDRAG, &CDragListCtrl::OnLvnBegindrag) //Jeff:VS2008才需要这种方式,否则VC6底下会报错;
	ON_NOTIFY_REFLECT(LVN_BEGINDRAG, OnLvnBegindrag)
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
END_MESSAGE_MAP()



// CDragListCtrl 消息处理程序
void CDragListCtrl::OnLvnBegindrag(NMHDR *pNMHDR, LRESULT *pResult)
{
	LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
	// TODO: 在此添加控件通知处理程序代码
	*pResult = 0;

	int count = GetSelectedCount();
	if (1 != count)
		return;

	POSITION pos = GetFirstSelectedItemPosition();
	if (NULL == pos)
		return;

	m_nSelItem = GetNextSelectedItem(pos);

	if (-1 == m_nSelItem)
		return;

	// 获取区域大小;
	// 获取当前活动的点;
	CPoint pt = pNMLV->ptAction;
	m_pDragImageList = CreateDragImage(m_nSelItem, &pt);
	if (NULL == m_pDragImageList)
		return;

	//////////////////////////////////////////////////////////////////////////
	CRect rcItem;
	GetItemRect(m_nSelItem, rcItem,  LVIR_ICON);
	//////////////////////////////////////////////////////////////////////////

	m_bDragging = TRUE;
	m_pDragImageList->BeginDrag(0, CPoint(18, 8));
	//m_pDragImageList->BeginDrag(0, pt);
	ClientToScreen(&pt);
	CRect rt;
	GetParent()->GetWindowRect(&rt);
	pt.x -= rt.left;
	pt.y -= rt.top;
	m_pDragImageList->DragEnter(GetParent(), pt);
	SetCapture();
}

void CDragListCtrl::OnLButtonUp(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	if (m_bDragging)
	{
		ReleaseCapture();
		m_bDragging = FALSE;
		//m_nSelItem = -1;
		m_pDragImageList->DragLeave(GetParent());
		m_pDragImageList->EndDrag();
		m_pDragImageList->DeleteImageList();

		delete m_pDragImageList;
		m_pDragImageList = NULL;
	}

	CListCtrl::OnLButtonUp(nFlags, point);
}

void CDragListCtrl::OnMouseMove(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	if (m_bDragging)
	{
		CPoint pt = point;
		ClientToScreen(&pt);

		CRect rt;
		GetParent()->GetWindowRect(&rt);
		pt.x -= rt.left;
		pt.y -= rt.top;
		m_pDragImageList->DragMove(pt);
	}

	CListCtrl::OnMouseMove(nFlags, point);
}