CListCtrl实现拖拽效果

方法1:

void ClistOx::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CPoint ptItem, //ptAction, //事件发生的位置ptImage;//移动位图的位置NM_LISTVIEW *pnmListView = (NM_LISTVIEW *)pNMHDR;ASSERT(!m_bDragging);m_bDragging = TRUE;//获得选种的项的索引m_iItemDrag = pnmListView-> iItem;//获得事件发生的位置ptAction = pnmListView-> ptAction;//获得项的位置GetItemPosition(m_iItemDrag, &ptItem); // ptItem is relative to (0,0) and not the view origin//获得视图原点位置GetOrigin(&m_ptOrigin);ASSERT(m_pimageListDrag == NULL);m_pimageListDrag = CreateDragImage(m_iItemDrag, &ptImage);IMAGEINFO imageInfo;m_pimageListDrag->GetImageInfo(0,&imageInfo);m_ptHotSpot = ptAction - ptItem + m_ptOrigin; // calculate hotspot for the cursorm_pimageListDrag-> DragShowNolock(TRUE); // lock updates and show drag imagem_pimageListDrag->Add(((HICON)LoadImage(NULL,_T("test.ico"),IMAGE_ICON,92,68,LR_LOADFROMFILE|LR_LOADTRANSPARENT)));//m_pimageListDrag-> SetDragCursorImage(2, m_ptHotSpot); // define the hot spot for the new cursor imagem_pimageListDrag-> BeginDrag(0, m_ptHotSpot);//ptAction -= m_sizeDelta;m_pimageListDrag-> DragEnter(this,ptAction);//m_pimageListDrag-> DragMove(ptAction); // move image to overlap original iconSetCapture();CRect rect;GetClientRect(&rect);ClientToScreen(&rect);ClipCursor(rect);//*pResult = 0;}void ClistOx::OnMouseMove(UINT nFlags, CPoint point){int iItem;if (m_bDragging){ASSERT(m_pimageListDrag != NULL);m_pimageListDrag-> DragMove(point); // move the image if ((iItem = HitTest(point )) != -1){m_iItemDrop = iItem;m_pimageListDrag-> SetDragCursorImage(1, CPoint(4,4));//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);//试图修改多种选中问题// SetItemState(iItem, 0, LVIS_SELECTED|LVIS_FOCUSED);// }//point -= m_sizeDelta;//m_pimageListDrag-> DragEnter(this, point); // lock updates and show drag image}else m_pimageListDrag-> SetDragCursorImage(-1, CPoint(0,0));}CListCtrl::OnMouseMove(nFlags, point);}void ClistOx::OnLButtonUp(UINT nFlags, CPoint point){//当是Icon和smallIcon时用FindItem()方法,其余遍厉视图列表,确定要替换的项CListCtrl::OnLButtonUp(nFlags, point);if (m_bDragging) // end of the drag operation{ASSERT(m_pimageListDrag != NULL);m_pimageListDrag-> DragLeave(this);m_pimageListDrag-> EndDrag();delete m_pimageListDrag;m_pimageListDrag = NULL;//获得这两项的位置if(m_iItemDrop==m_iItemDrag){SetItemPosition(m_iItemDrag,CPoint(point + m_ptOrigin - m_ptHotSpot));}else{CPoint pointDrag,pointDrop;GetItemPosition(m_iItemDrop,&pointDrop);GetItemPosition(m_iItemDrag,&pointDrag);SetItemPosition(m_iItemDrag,pointDrop);SetItemPosition(m_iItemDrop,pointDrag);}m_bDragging = FALSE;Invalidate();::ReleaseCapture();ClipCursor(NULL);}//CListCtrl::OnLButtonUp(nFlags, point);}

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方法2：

条目拖动

#define MAX_DRAG_SIZE 128
#define MAX_DRAG_SIZE_2 (MAX_DRAG_SIZE/2)


添加数据成员

CImageList* m_pDragImage = NULL;//拖动时的图片
int m_nDragDrop, m_nDrag[MAX_DRAG_SIZE];//用于记录被拖动条目的index以及拖动到的位置


注：本文中仅以拖动1条为例，重在介绍方法，如果需要可作相应的扩展

响应消息LVN_BEGINDRAG, WM_MOUSEMOVE WM_LBUTTONUP
ON_NOTIFY_REFLECT(LVN_BEGINDRAG, OnBegindrag)

void CMyList::OnBegindrag(NMHDR *pNMHDR, LRESULT *pResult){ LPNMHEADER phdr = reinterpret_cast(pNMHDR); // TODO: 在此添加控件通知处理程序代码 NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR; *pResult = 0; CPoint ptAction( pNMListView->ptAction ); for ( int i = 0; i < MAX_DRAG_SIZE; i++ ){ m_nDrag[i] = -1;} m_pDragImage = CreateDragImage( ptAction );//绘制图像 if ( m_pDragImage == NULL ) return; m_nDragDrop = -1; UpdateWindow(); CRect rcClient; GetClientRect( &rcClient ); ClientToScreen( &rcClient ); ClipCursor( &rcClient ); SetCapture(); SetFocus(); UpdateWindow(); m_pDragImage->DragEnter( this, ptAction ); *pResult = 0;}CImageList* CMyList::CreateDragImage(const CPoint& ptMouse){CRect rcClient, rcOne, rcAll( 32000, 32000, -32000, -32000 );int nIndex;if ( GetSelectedCount() == 0 ) return NULL;SetFocus();GetClientRect( &rcClient );int nCount = 0;for ( nIndex = -1 ; ( nIndex = GetNextItem( nIndex, LVNI_SELECTED ) ) >= 0 && MAX_DRAG_SIZE >= nCount; ){ m_nDrag[ nCount++ ] = nIndex; GetItemRect( nIndex, rcOne, LVIR_BOUNDS ); if ( rcOne.IntersectRect( &rcClient, &rcOne ) ) { rcAll.left = min( rcAll.left, rcOne.left ); rcAll.top = min( rcAll.top, rcOne.top ); rcAll.right = max( rcAll.right, rcOne.right ); rcAll.bottom = max( rcAll.bottom, rcOne.bottom ); } SetItemState( nIndex, 0, LVIS_FOCUSED );}BOOL bClipped = rcAll.Height() > MAX_DRAG_SIZE;if ( bClipped ){ rcAll.left = max( rcAll.left, ptMouse.x - MAX_DRAG_SIZE_2 ); rcAll.right = max( rcAll.right, ptMouse.x + MAX_DRAG_SIZE_2 ); rcAll.top = max( rcAll.top, ptMouse.y - MAX_DRAG_SIZE_2 ); rcAll.bottom = max( rcAll.bottom, ptMouse.y + MAX_DRAG_SIZE_2 );}CClientDC dcClient( this );CBitmap bmAll, bmDrag;CDC dcAll, dcDrag;if ( ! dcAll.CreateCompatibleDC( &dcClient ) ) return NULL;if ( ! bmAll.CreateCompatibleBitmap( &dcClient, rcClient.Width(), rcClient.Height() ) ) return NULL;if ( ! dcDrag.CreateCompatibleDC( &dcClient ) ) return NULL;if ( ! bmDrag.CreateCompatibleBitmap( &dcClient, rcAll.Width(), rcAll.Height() ) ) return NULL;CBitmap *pOldAll = dcAll.SelectObject( &bmAll );COLORREF crDrag = RGB( 250, 255, 250 );dcAll.FillSolidRect( &rcClient, crDrag );COLORREF crBack = GetBkColor();SetBkColor( crDrag );SendMessage( WM_PAINT, (WPARAM)dcAll.GetSafeHdc() );SetBkColor( crBack );CBitmap *pOldDrag = dcDrag.SelectObject( &bmDrag );dcDrag.FillSolidRect( 0, 0, rcAll.Width(), rcAll.Height(), crDrag );CRgn pRgn;if ( bClipped ){ CPoint ptMiddle( ptMouse.x - rcAll.left, ptMouse.y - rcAll.top ); pRgn.CreateEllipticRgn( ptMiddle.x - MAX_DRAG_SIZE_2, ptMiddle.y - MAX_DRAG_SIZE_2, ptMiddle.x + MAX_DRAG_SIZE_2, ptMiddle.y + MAX_DRAG_SIZE_2 ); dcDrag.SelectClipRgn( &pRgn );}for ( nIndex = -1 ; ( nIndex = GetNextItem( nIndex, LVNI_SELECTED ) ) >= 0 ; ){ GetItemRect( nIndex, rcOne, LVIR_BOUNDS ); if ( rcOne.IntersectRect( &rcAll, &rcOne ) ) { dcDrag.BitBlt( rcOne.left - rcAll.left, rcOne.top - rcAll.top, rcOne.Width(), rcOne.Height(), &dcAll, rcOne.left, rcOne.top, SRCCOPY ); }}dcDrag.SelectObject( pOldDrag );dcAll.SelectObject( pOldAll );dcDrag.DeleteDC();bmAll.DeleteObject();dcAll.DeleteDC();CImageList* pAll = new CImageList();pAll->Create( rcAll.Width(), rcAll.Height(), ILC_COLOR16|ILC_MASK, 1, 1 );pAll->Add( &bmDrag, crDrag );bmDrag.DeleteObject();pAll->BeginDrag( 0, ptMouse - rcAll.TopLeft() );return pAll;}void CMyList::OnMouseMove(UINT nFlags, CPoint point)//移动的视觉效果{// TODO: 在此添加消息处理程序代码和/或调用默认值int nHit = HitTest( point );if ( m_pDragImage != NULL ){ m_pDragImage->DragMove( point ); if ( nHit != m_nDragDrop ) { CImageList:ragShowNolock( FALSE ); if ( m_nDragDrop >= 0 ) SetItemState( m_nDragDrop, 0, LVIS_DROPHILITED ); m_nDragDrop = nHit; if ( m_nDragDrop >= 0 ) SetItemState( m_nDragDrop, LVIS_DROPHILITED, LVIS_DROPHILITED ); UpdateWindow(); CImageList:ragShowNolock( TRUE ); }}CListCtrl::OnMouseMove(nFlags, point);}void CMyList::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_pDragImage == NULL ){ CListCtrl::OnLButtonUp( nFlags, point ); return;}ClipCursor( NULL );ReleaseCapture();m_pDragImage->DragLeave( this );m_pDragImage->EndDrag();delete m_pDragImage;m_pDragImage = NULL;if ( m_nDragDrop >= 0 ){ SetItemState( m_nDragDrop, 0, LVIS_DROPHILITED ); /*由于本类中只是加了拖动的效果和记录拖动的相关信息，当拖动结束以后并没有实际效果。故需要传递消息 在其父窗口中进行拖动的实际处理*/ NM_LISTVIEW pNotify; pNotify.hdr.hwndFrom = GetSafeHwnd(); pNotify.hdr.idFrom = GetDlgCtrlID(); pNotify.hdr.code = HDN_ENDDRAG; pNotify.iItem = m_nDragDrop;//拖动到的index pNotify.lParam = (LPARAM)m_nDrag;//被拖动的Item GetOwner()->SendMessage( WM_NOTIFY, pNotify.hdr.idFrom, (LPARAM)&pNotify );}}

在其listbox的父窗口中进行以下处理
ON_NOTIFY(HDN_ENDDRAG, IDC_LIST, OnEnddragList)//IDC_LIST为list控件的ID

 

void CDlgXX::OnEnddragList(NMHDR *pNMHDR, LRESULT *pResult){NM_LISTVIEW* pNotify = (NM_LISTVIEW *)pNMHDR;int* pBegin = (int*)pNotify->lParam;int nEnd = pNotify->iItem;m_bChange = TRUE;CString strTmp;BOOL bAhead = pBegin[0] > nEnd ? TRUE : FALSE;for ( int i = 0; i < MAX_DRAG_SIZE && pBegin[i] >= 0; i++ ){ if ( pBegin[i] == nEnd ) { nEnd++; continue; } strTmp = m_ctrlList.GetItemText( pBegin[i], 0 ); m_ctrlList.DeleteItem( pBegin[i] ); /*向上托第一条插在nEnd之前，向下托第一条插在nEnd之后，所拖动的条目保持原来的顺序*/ if ( bAhead ) { if ( pBegin[i] < nEnd ) nEnd--; for ( int j = i + 1; j < MAX_DRAG_SIZE && pBegin[j] >= 0; j++) { if ( pBegin[j] <= nEnd ) pBegin[j]--; } m_ctrlList.InsertItem( nEnd, strTmp ); nEnd++; } else { if ( pBegin[i] >= nEnd ) nEnd++; for ( int j = i + 1; j < MAX_DRAG_SIZE && pBegin[j] >= 0; j++) if ( pBegin[j] <= nEnd ) pBegin[j]--; m_ctrlList.InsertItem( nEnd, strTmp ); }} *pResult = 0;}