// GridDropTarget.cpp : implementation file
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//
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// MFC Grid Control - Drag/Drop target implementation
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//
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// CGridDropTarget is an OLE drop target for CGridCtrl. All it does
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// is handle the drag and drop windows messages and pass them
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// directly onto the grid control.
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//
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// Written by Chris Maunder <chris@codeproject.com>
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// Copyright (c) 1998-2005. All Rights Reserved.
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//
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// This code may be used in compiled form in any way you desire. This
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// file may be redistributed unmodified by any means PROVIDING it is
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// not sold for profit without the authors written consent, and
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// providing that this notice and the authors name and all copyright
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// notices remains intact.
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//
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// An email letting me know how you are using it would be nice as well.
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//
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// This file is provided "as is" with no expressed or implied warranty.
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// The author accepts no liability for any damage/loss of business that
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// this product may cause.
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//
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// For use with CGridCtrl v2.10+
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//
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/////////////////////////////////////////////////////////////////////////////
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#include "stdafx.h"
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#include "GridCtrl.h"
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#ifndef GRIDCONTROL_NO_DRAGDROP
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#include "GridDropTarget.h"
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#ifdef _DEBUG
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#define new DEBUG_NEW
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#undef THIS_FILE
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static char THIS_FILE[] = __FILE__;
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#endif
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/////////////////////////////////////////////////////////////////////////////
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// CGridDropTarget
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CGridDropTarget::CGridDropTarget()
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{
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m_pGridCtrl = NULL;
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m_bRegistered = FALSE;
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}
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CGridDropTarget::~CGridDropTarget()
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{
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}
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// Overloaded Register() function performs the normal COleDropTarget::Register
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// but also serves to connect this COleDropTarget with the parent grid control,
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// where all drop messages will ultimately be forwarded.
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BOOL CGridDropTarget::Register(CGridCtrl *pGridCtrl)
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{
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if (m_bRegistered)
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return FALSE;
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// Stop re-entry problems
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static BOOL bInProcedure = FALSE;
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if (bInProcedure)
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return FALSE;
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bInProcedure = TRUE;
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ASSERT(pGridCtrl->IsKindOf(RUNTIME_CLASS(CGridCtrl)));
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ASSERT(pGridCtrl);
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if (!pGridCtrl || !pGridCtrl->IsKindOf(RUNTIME_CLASS(CGridCtrl)))
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{
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bInProcedure = FALSE;
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return FALSE;
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}
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m_pGridCtrl = pGridCtrl;
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m_bRegistered = COleDropTarget::Register(pGridCtrl);
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bInProcedure = FALSE;
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return m_bRegistered;
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}
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void CGridDropTarget::Revoke()
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{
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m_bRegistered = FALSE;
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COleDropTarget::Revoke();
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}
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BEGIN_MESSAGE_MAP(CGridDropTarget, COleDropTarget)
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//{{AFX_MSG_MAP(CGridDropTarget)
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//}}AFX_MSG_MAP
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END_MESSAGE_MAP()
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/////////////////////////////////////////////////////////////////////////////
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// CGridDropTarget message handlers
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DROPEFFECT CGridDropTarget::OnDragScroll(CWnd* pWnd, DWORD dwKeyState, CPoint /*point*/)
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{
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// TRACE("In CGridDropTarget::OnDragScroll\n");
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if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
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{
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if (dwKeyState & MK_CONTROL)
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return DROPEFFECT_COPY;
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else
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return DROPEFFECT_MOVE;
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} else
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return DROPEFFECT_NONE;
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}
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DROPEFFECT CGridDropTarget::OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject,
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DWORD dwKeyState, CPoint point)
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{
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TRACE(_T("In CGridDropTarget::OnDragEnter\n"));
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ASSERT(m_pGridCtrl);
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if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
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return m_pGridCtrl->OnDragEnter(pDataObject, dwKeyState, point);
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else
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return DROPEFFECT_NONE;
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}
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void CGridDropTarget::OnDragLeave(CWnd* pWnd)
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{
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TRACE(_T("In CGridDropTarget::OnDragLeave\n"));
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ASSERT(m_pGridCtrl);
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if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
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m_pGridCtrl->OnDragLeave();
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}
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DROPEFFECT CGridDropTarget::OnDragOver(CWnd* pWnd, COleDataObject* pDataObject,
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DWORD dwKeyState, CPoint point)
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{
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// TRACE("In CGridDropTarget::OnDragOver\n");
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ASSERT(m_pGridCtrl);
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if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
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return m_pGridCtrl->OnDragOver(pDataObject, dwKeyState, point);
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else
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return DROPEFFECT_NONE;
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}
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BOOL CGridDropTarget::OnDrop(CWnd* pWnd, COleDataObject* pDataObject,
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DROPEFFECT dropEffect, CPoint point)
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{
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TRACE(_T("In CGridDropTarget::OnDrop\n"));
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ASSERT(m_pGridCtrl);
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if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
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return m_pGridCtrl->OnDrop(pDataObject, dropEffect, point);
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else
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return FALSE;
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}
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#endif // GRIDCONTROL_NO_DRAGDROP
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