GridDropTarget.cpp
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// GridDropTarget.cpp : implementation file
//
// MFC Grid Control - Drag/Drop target implementation
//
// CGridDropTarget is an OLE drop target for CGridCtrl. All it does
// is handle the drag and drop windows messages and pass them
// directly onto the grid control.
//
// Written by Chris Maunder <cmaunder@mail.com>
// Copyright (c) 1998-2002. All Rights Reserved.
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed unmodified by any means PROVIDING it is
// not sold for profit without the authors written consent, and
// providing that this notice and the authors name and all copyright
// notices remains intact.
//
// An email letting me know how you are using it would be nice as well.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability for any damage/loss of business that
// this product may cause.
//
// For use with CGridCtrl v2.10+
//
/////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "GridCtrl.h"
#ifndef GRIDCONTROL_NO_DRAGDROP
#include "GridDropTarget.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CGridDropTarget
CGridDropTarget::CGridDropTarget()
{
m_pGridCtrl = NULL;
m_bRegistered = FALSE;
}
CGridDropTarget::~CGridDropTarget()
{
}
// Overloaded Register() function performs the normal COleDropTarget::Register
// but also serves to connect this COleDropTarget with the parent grid control,
// where all drop messages will ultimately be forwarded.
BOOL CGridDropTarget::Register(CGridCtrl *pGridCtrl)
{
if (m_bRegistered)
return FALSE;
// Stop re-entry problems
static BOOL bInProcedure = FALSE;
if (bInProcedure)
return FALSE;
bInProcedure = TRUE;
ASSERT(pGridCtrl->IsKindOf(RUNTIME_CLASS(CGridCtrl)));
ASSERT(pGridCtrl);
if (!pGridCtrl || !pGridCtrl->IsKindOf(RUNTIME_CLASS(CGridCtrl)))
{
bInProcedure = FALSE;
return FALSE;
}
m_pGridCtrl = pGridCtrl;
m_bRegistered = COleDropTarget::Register(pGridCtrl);
bInProcedure = FALSE;
return m_bRegistered;
}
void CGridDropTarget::Revoke()
{
m_bRegistered = FALSE;
COleDropTarget::Revoke();
}
BEGIN_MESSAGE_MAP(CGridDropTarget, COleDropTarget)
//{{AFX_MSG_MAP(CGridDropTarget)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CGridDropTarget message handlers
DROPEFFECT CGridDropTarget::OnDragScroll(CWnd* pWnd, DWORD dwKeyState, CPoint /*point*/)
{
// TRACE("In CGridDropTarget::OnDragScroll\n");
if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
{
if (dwKeyState & MK_CONTROL)
return DROPEFFECT_COPY;
else
return DROPEFFECT_MOVE;
} else
return DROPEFFECT_NONE;
}
DROPEFFECT CGridDropTarget::OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject,
DWORD dwKeyState, CPoint point)
{
TRACE(_T("In CGridDropTarget::OnDragEnter\n"));
ASSERT(m_pGridCtrl);
if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
return m_pGridCtrl->OnDragEnter(pDataObject, dwKeyState, point);
else
return DROPEFFECT_NONE;
}
void CGridDropTarget::OnDragLeave(CWnd* pWnd)
{
TRACE(_T("In CGridDropTarget::OnDragLeave\n"));
ASSERT(m_pGridCtrl);
if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
m_pGridCtrl->OnDragLeave();
}
DROPEFFECT CGridDropTarget::OnDragOver(CWnd* pWnd, COleDataObject* pDataObject,
DWORD dwKeyState, CPoint point)
{
// TRACE("In CGridDropTarget::OnDragOver\n");
ASSERT(m_pGridCtrl);
if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
return m_pGridCtrl->OnDragOver(pDataObject, dwKeyState, point);
else
return DROPEFFECT_NONE;
}
BOOL CGridDropTarget::OnDrop(CWnd* pWnd, COleDataObject* pDataObject,
DROPEFFECT dropEffect, CPoint point)
{
TRACE(_T("In CGridDropTarget::OnDrop\n"));
ASSERT(m_pGridCtrl);
if (pWnd->GetSafeHwnd() == m_pGridCtrl->GetSafeHwnd())
return m_pGridCtrl->OnDrop(pDataObject, dropEffect, point);
else
return FALSE;
}
#endif // GRIDCONTROL_NO_DRAGDROP