怎样可以做一个支持托拽的ListCtrl?

使用COleDrag实现，需要重载BeginDrag OnDragEnter,OnDragMove,OnDragLeave等

// sortlistDlg.cpp : implementation file
//#include "stdafx.h"
#include "sortlist.h"
#include "sortlistDlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog
{
public:
CAboutDlg();// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA // ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
//}}AFX_VIRTUAL// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CSortlistDlg dialogCSortlistDlg::CSortlistDlg(CWnd* pParent /*=NULL*/)
: CDialog(CSortlistDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CSortlistDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
    m_bDragging = FALSE;
}void CSortlistDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CSortlistDlg)
DDX_Control(pDX, IDC_LIST1, m_clistctrl);
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CSortlistDlg, CDialog)
//{{AFX_MSG_MAP(CSortlistDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_WM_LBUTTONUP()
ON_WM_MOUSEMOVE()
//}}AFX_MSG_MAP
    ON_NOTIFY(LVN_BEGINDRAG, IDC_LIST1, OnBeginDrag)
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CSortlistDlg message handlersBOOL CSortlistDlg::OnInitDialog()
{
CDialog::OnInitDialog(); // Add "About..." menu item to system menu. // IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
} // Set the icon for this dialog.  The framework does this automatically
//  when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
    //List Ctrl stuff
    m_cimagelist.Create(IDB_BITMAP1, 10, 1, RGB(100,100,100));
    m_clistctrl.SetImageList(&m_cimagelist, LVSIL_SMALL); LV_COLUMN lvcol;
    lvcol.mask = LVCF_SUBITEM | LVCF_TEXT | LVCF_WIDTH;
    lvcol.pszText = "#";
    lvcol.iSubItem = 0;
    lvcol.cx = 130;    m_clistctrl.InsertColumn(0, &lvcol);   LV_COLUMN lvcol2;
    lvcol2.mask = LVCF_SUBITEM | LVCF_TEXT | LVCF_WIDTH;
    lvcol2.pszText = "ID";
    lvcol2.iSubItem = 1;
    lvcol2.cx = 130;    m_clistctrl.InsertColumn(1, &lvcol2);
    int i = 0;
    int iImage = 0;
    for (int ii = 1000; ii < 1030; ii++, i++)
    {
        LV_ITEM lvi;
        lvi.mask = LVIF_TEXT | LVIF_IMAGE;
        char sz[20];
        _itoa(i, sz, 10);
        lvi.iItem = 0;
        lvi.iSubItem = 0;
        lvi.pszText = sz;
        lvi.iImage = iImage;
        if (iImage == 0)
            iImage++;
        else
            iImage--;
        int iii = m_clistctrl.InsertItem(&lvi);        LV_ITEM lvi2;
        lvi2.mask = LVIF_TEXT;
        char sz2[20];
        _itoa(ii, sz2, 10);
        m_clistctrl.SetItemText(iii, 1, sz2);
    }    ListView_SetExtendedListViewStyle
        (m_clistctrl.m_hWnd, LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES | LVS_EX_HEADERDRAGDROP);


return TRUE;  // return TRUE  unless you set the focus to a control
}

void CSortlistDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.void CSortlistDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CSortlistDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}void CSortlistDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
        if( m_bDragging )
        {
                //RELEASE THE MOUSE CAPTURE AND END THE DRAGGING
                ::ReleaseCapture();
                m_bDragging = FALSE;
                m_pDragImage->DragLeave(GetDesktopWindow());
                m_pDragImage->EndDrag();
                delete m_pDragImage;

                //GET THE WINDOW UNDER THE DROP POINT
                CPoint pt(point);
                ClientToScreen(&pt);
                m_pDropWnd = WindowFromPoint(pt);

                //DROP THE ITEM ON THE LIST
                if( m_pDropWnd->IsKindOf(RUNTIME_CLASS(CListCtrl)) )
                        DropItemOnList();
        } CDialog::OnLButtonUp(nFlags, point);
}void CSortlistDlg::OnBeginDrag(NMHDR* pnmhdr, LRESULT* pResult)
{
        //RECORD THE INDEX OF THE ITEM BEIGN DRAGGED AS m_nDragIndex
        m_nDragIndex = ((NM_LISTVIEW *)pnmhdr)->iItem;

        //CREATE A DRAG IMAGE FROM THE CENTER POINT OF THE ITEM IMAGE
        POINT pt;
        pt.x = 8;
        pt.y = 8;
        m_pDragImage = m_clistctrl.CreateDragImage(m_nDragIndex, &pt);
        m_pDragImage->BeginDrag(0, CPoint (8, 8));
        m_pDragImage->DragEnter(
                GetDesktopWindow(), ((NM_LISTVIEW *)pnmhdr)->ptAction);

        //SET THE FLAGS INDICATING A DRAG IN PROGRESS
        m_bDragging = TRUE;
        m_nDropIndex = -1;
        m_pDropWnd = &m_clistctrl;

        //CAPTURE ALL MOUSE MESSAGES IN CASE THE USER DRAGS OUTSIDE OF THE VIEW
        SetCapture();
}void CSortlistDlg::OnMouseMove(UINT nFlags, CPoint point)
{
        if( m_bDragging )
        {
                m_ptDropPoint = point;
                ClientToScreen(&m_ptDropPoint);

                //MOVE THE DRAG IMAGE
                m_pDragImage->DragMove(m_ptDropPoint);

                //TEMPORARILY UNLOCK WINDOW UPDATES
                m_pDragImage->DragShowNolock(FALSE);

                //CONVERT THE DROP POINT TO CLIENT CO-ORDIANTES
                m_pDropWnd = WindowFromPoint(m_ptDropPoint);
                m_pDropWnd->ScreenToClient(&m_ptDropPoint);                //SCROLL VIEW IF NECESSARY
                int iOverItem = m_clistctrl.HitTest(m_ptDropPoint);
                int iTopItem = m_clistctrl.GetTopIndex();
                int iBottomItem = iTopItem + m_clistctrl.GetCountPerPage() - 1;
                if (iOverItem == iTopItem && iTopItem != 0)
                    {
                    m_clistctrl.EnsureVisible(iOverItem - 1, false);
                    ::UpdateWindow(m_clistctrl.m_hWnd);
                    }
                else if (iOverItem == iBottomItem && iBottomItem != (m_clistctrl.GetItemCount() - 1))
{
                    m_clistctrl.EnsureVisible(iOverItem + 1, false);
                    ::UpdateWindow(m_clistctrl.m_hWnd);
}                //LOCK WINDOW UPDATES
                m_pDragImage->DragShowNolock(TRUE);
        }

CDialog::OnMouseMove(nFlags, point);
}void CSortlistDlg::DropItemOnList()
{
        //GET THE DROP INDEX
        m_ptDropPoint.y += 10;
        m_ptDropPoint.x = 0;//allows dropping to right of last column
        m_nDropIndex = m_clistctrl.HitTest(m_ptDropPoint);

        //GET INFORMATION ON THE DRAGGED ITEM BY SETTING AN LV_ITEM STRUCTURE
        //AND THEN CALLING GetItem TO FILL IT IN
        char szLabel[256];
        LV_ITEM lvi;
        ZeroMemory(&lvi, sizeof(LV_ITEM));
        lvi.mask = LVIF_TEXT | LVIF_IMAGE;
        lvi.stateMask = LVIS_DROPHILITED | LVIS_FOCUSED | LVIS_SELECTED;
        lvi.pszText = szLabel;
        lvi.iItem = m_nDragIndex;
        lvi.cchTextMax = 255;
        m_clistctrl.GetItem(&lvi);

        //INSERT THE DROPPED ITEM
        if(m_nDropIndex < 0) m_nDropIndex = m_clistctrl.GetItemCount();
        lvi.iItem = m_nDropIndex;
        m_clistctrl.InsertItem(&lvi);

        //FILL IN ALL OF THE COLUMNS
        CHeaderCtrl* pHeader = (CHeaderCtrl*)m_clistctrl.GetDlgItem(0);
        int nColumnCount = pHeader->GetItemCount();
        lvi.mask = LVIF_TEXT;
        lvi.iItem = m_nDropIndex;
        //INDEX OF DRAGGED ITEM WILL CHANGE IF ITEM IS DROPPED ABOVE ITSELF
        if(m_nDragIndex > m_nDropIndex) m_nDragIndex++;
        for(int col=1; col < nColumnCount; col++)
        {
                strcpy(lvi.pszText, (LPCTSTR)(m_clistctrl.GetItemText(m_nDragIndex,
                        col)));
                lvi.iSubItem = col;
                m_clistctrl.SetItem(&lvi);
        }

        //DELETE THE ITEM THAT WAS DRAGGED FROM ITS ORIGINAL LOCATION
        m_clistctrl.DeleteItem(m_nDragIndex);        //FIX HEADER - it disappears if item was scrolled & dropped;
        pHeader->RedrawWindow();}

给你一通用的
http://wlbookwl.myrice.com/jck/MSVCer/vcCOleDropTarget.htm

调试易

怎样可以做一个支持托拽的ListCtrl?

解决方案 »