ASSERT(!m_bDragging);
m_bDragging = TRUE;
m_iItemDrag = pnmListView->iItem;
ptAction = pnmListView->ptAction;
GetItemPosition(m_iItemDrag, &ptItem); // ptItem is relative to (0,0) and not the view origin
GetOrigin(&m_ptOrigin);
ASSERT(m_pimageListDrag == NULL);
m_pimageListDrag = CreateDragImage(m_iItemDrag, &ptImage);
m_sizeDelta = ptAction - ptImage; // difference between cursor pos and image pos
m_ptHotSpot = ptAction - ptItem + m_ptOrigin; // calculate hotspot for the cursor
m_pimageListDrag->DragShowNolock(TRUE); // lock updates and show drag image
m_pimageListDrag->SetDragCursorImage(0, m_ptHotSpot); // define the hot spot for the new cursor image
m_pimageListDrag->BeginDrag(0, CPoint(0, 0));
ptAction -= m_sizeDelta;
m_pimageListDrag->DragEnter(this, ptAction);
m_pimageListDrag->DragMove(ptAction); // move image to overlap original icon
SetCapture();
}
void CMyListCtrl::OnMouseMove(UINT nFlags, CPoint point)
{
long lStyle;
int iItem;
LV_ITEM lvitem;
lStyle = GetWindowLong(m_hWnd, GWL_STYLE);
lStyle &= LVS_TYPEMASK; // drag will do different things in list and report mode
if (m_bDragging)
{
ASSERT(m_pimageListDrag != NULL);
m_pimageListDrag->DragMove(point - m_sizeDelta); // move the image
if ((iItem = HitTest(point)) != -1)
{
m_iItemDrop = iItem;
m_pimageListDrag->DragLeave(this); // unlock the window and hide drag image
if (lStyle == LVS_REPORT || lStyle == LVS_LIST)
{
lvitem.iItem = iItem;
lvitem.iSubItem = 0;
lvitem.mask = LVIF_STATE;
lvitem.stateMask = LVIS_DROPHILITED; // highlight the drop target
SetItem(&lvitem);
}
point -= m_sizeDelta;
m_pimageListDrag->DragEnter(this, point); // lock updates and show drag image
}
}
CListCtrl::OnMouseMove(nFlags, point);
}
void CMyListCtrl::OnButtonUp(CPoint point)
{
if (m_bDragging) // end of the drag operation
{
long lStyle;
CString cstr;
// The drop target's sub-item text is replaced by the dragged item's
// main text
if (lStyle == LVS_REPORT && m_iItemDrop != m_iItemDrag)
{
cstr = GetItemText(m_iItemDrag, 0);
SetItemText(m_iItemDrop, 1, cstr);
}
//the character string "**" is added to the end of the drop target's main text
if (lStyle == LVS_LIST && m_iItemDrop != m_iItemDrag)
{
cstr = GetItemText(m_iItemDrop, 0);
cstr += _T("**");
SetItemText(m_iItemDrop, 0, cstr);
}
// move the icon
if (lStyle == LVS_ICON || lStyle == LVS_SMALLICON)
{
point -= m_ptHotSpot; // the icon should be drawn exactly where the image is
point += m_ptOrigin;
SetItemPosition(m_iItemDrag, point); // just move the dragged item
}