Tricks of the Windows Gam…ming Gurus (2nd Edition)/Disc2.iso/msdn_vcb/samples/vc98/mfc/general/listhdr/mlistctl.cpp

C/C++ Source or Header | 1998-03-27 | 5.0 KB | 175 lines

// MyListCtrl.cpp : implementation file
//

// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.

#include "stdafx.h"
#include "listhdr.h"
#include "mlistctl.h"
//#include "listcpg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMyListCtrl

CMyListCtrl::CMyListCtrl()
{
    m_bDragging = FALSE;
    m_pimageListDrag = NULL;
}

CMyListCtrl::~CMyListCtrl()
{
}


BEGIN_MESSAGE_MAP(CMyListCtrl, CListCtrl)
    //{{AFX_MSG_MAP(CMyListCtrl)
    ON_NOTIFY_REFLECT(LVN_BEGINDRAG, OnBeginDrag)
    ON_NOTIFY_REFLECT(LVN_BEGINRDRAG, OnBeginDrag)
    ON_NOTIFY_REFLECT(LVN_ENDLABELEDIT, OnEndLabelEdit)
    ON_WM_MOUSEMOVE()
    ON_WM_LBUTTONUP()
    ON_WM_RBUTTONUP()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyListCtrl message handlers
void CMyListCtrl::OnBeginDrag(LPNMHDR pnmhdr, LRESULT *pResult)
{
    CPoint          ptItem, ptAction, ptImage;
    NM_LISTVIEW     *pnmListView = (NM_LISTVIEW *)pnmhdr;

    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;

        lStyle = GetWindowLong(m_hWnd, GWL_STYLE) & LVS_TYPEMASK;
        m_bDragging = FALSE;

        ASSERT(m_pimageListDrag != NULL);
        m_pimageListDrag->DragLeave(this);
        m_pimageListDrag->EndDrag();
        delete m_pimageListDrag;
        m_pimageListDrag = NULL;

        // 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
        }

        ::ReleaseCapture();
    }
}

void CMyListCtrl::OnLButtonUp(UINT nFlags, CPoint point)
{
    OnButtonUp(point);
    CListCtrl::OnLButtonUp(nFlags, point);
}

void CMyListCtrl::OnRButtonUp(UINT nFlags, CPoint point)
{
    OnButtonUp(point);
    CListCtrl::OnRButtonUp(nFlags, point);
}

void CMyListCtrl::OnEndLabelEdit(LPNMHDR pnmhdr, LRESULT *pLResult)
{
    LV_DISPINFO  *plvDispInfo = (LV_DISPINFO *)pnmhdr;
    LV_ITEM      *plvItem = &plvDispInfo->item;

    if (plvItem->pszText != NULL)
        SetItemText(plvItem->iItem, plvItem->iSubItem, plvItem->pszText);
}