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TTDropTarget.h
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TTDropTarget.h
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#pragma once
#include "afxole.h"
#include "CustomMessages.h"
#include <exception>
template<typename DataType>
class CTTDropTarget : public COleDropTarget
{
public:
CTTDropTarget();
~CTTDropTarget();
BOOL Register(CWnd* pWnd, FORMATETC cbFormat);
typedef struct tagDragParameters // data passed with drag event messages
{
DWORD dwKeyState; // WM_APP_DRAG_ENTER, WM_APP_DRAG_OVER
CPoint point;
DROPEFFECT dropEffect; // dropDefault parameter with WM_APP_DROP_EX
DROPEFFECT dropList; // with WM_APP_DROP_EX only
} DragParameters;
// Overrides
virtual DROPEFFECT OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point);
virtual DROPEFFECT OnDragOver(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point);
virtual void OnDragLeave(CWnd* pWnd);
virtual DROPEFFECT OnDropEx(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropDefault, DROPEFFECT dropList, CPoint point);
virtual BOOL OnDrop(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point);
virtual DROPEFFECT OnDragScroll(CWnd* pWnd, DWORD dwKeyState, CPoint point);
LPVOID GetLpDataObject();
DataType* GetDataObject();
DWORD GetSize();
protected:
FORMATETC m_CBFormat;
DataType* m_pDataObject;
DataType m_DataObject;
LPVOID m_lpDataObject;
DWORD m_dwSize;
private:
void ResolveDataObject(COleDataObject* pDataObject);
};
template<typename DataType>
CTTDropTarget<DataType>::CTTDropTarget()
{
m_pDataObject = NULL;
ZeroMemory(&m_DataObject, sizeof(DataType));
}
template<typename DataType>
CTTDropTarget<DataType>::~CTTDropTarget()
{
if (m_pDataObject)
{
delete m_pDataObject;
m_pDataObject = NULL;
}
ZeroMemory(&m_DataObject, sizeof(DataType));
}
template<typename DataType>
BOOL CTTDropTarget<DataType>::Register(CWnd* pWnd, FORMATETC cbFormat)
{
if (pWnd == NULL)
return E_FAIL;
if (cbFormat.cfFormat == 0L)
return E_FAIL;
m_CBFormat = cbFormat;
return COleDropTarget::Register(pWnd);
}
// Called by OLE when drag cursor first enters a registered window.
// Use this for:
// - Determination if target is able to drop data.
// - Optional highlight target.
// - Optional set drop description cursor type and text
template<typename DataType>
DROPEFFECT CTTDropTarget<DataType>::OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point)
{
DROPEFFECT dwRet = DROPEFFECT_NONE;
ResolveDataObject(pDataObject);
/*if (m_pDataObject == NULL)
return dwRet;*/
DragParameters Params = { 0 };
Params.dwKeyState = dwKeyState;
Params.point = point;
dwRet = static_cast<DROPEFFECT>(pWnd->SendMessage(
TWM_DRAG_ENTER,
reinterpret_cast<WPARAM>(this),
reinterpret_cast<LPARAM>(&Params)));
return dwRet;
}
// Called when cursor is dragged over a registered window and
// before OnDropEx/OnDrop when mouse button is released.
// Note: OnDragOver is like the WM_MOUSEMOVE message, it is called repeatedly
// when the mouse moves inside the window.
// The mainly purpose of this function is to change the cursor according to
// the key state.
// When dropping, the return value is passed to OnDropEx/OnDrop.
template<typename DataType>
DROPEFFECT CTTDropTarget<DataType>::OnDragOver(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point)
{
DROPEFFECT dwRet = DROPEFFECT_NONE;
/*if (m_pDataObject == NULL)
return dwRet;*/
DragParameters Params = { 0 };
Params.dwKeyState = dwKeyState;
Params.point = point;
dwRet = static_cast<DROPEFFECT>(pWnd->SendMessage(
TWM_DRAG_OVER,
reinterpret_cast<WPARAM>(this),
reinterpret_cast<LPARAM>(&Params)));
return dwRet;
}
// Called when drag cursor leaves a registered window.
// Use this for cleanup (e.g. remove highlighting).
// NOTE:
// This is not called when OnDrop or OnDropEx are implemented in a window class and has been called!
// So it may be necessary to perform a similar clean up at the end of OnDrop or OnDropEx of the window class!
template<typename DataType>
void CTTDropTarget<DataType>::OnDragLeave(CWnd* pWnd)
{
pWnd->SendMessage(TWM_DRAG_LEAVE,
reinterpret_cast<WPARAM>(this), 0L);
m_pDataObject = NULL;
}
// Called when mouse button is released.
// Before this is called, OnDragOver() is called and the return value is passed in the dropDefault parameter.
// Note that this is always called even when OnDragOver() returned DROPEFFECT_NONE.
// So implementations should check dropDefault and do nothing if it is DROPEFFECT_NONE.
// They may optionally return -1 in this case to get OnDragLeave() called.
template<typename DataType>
DROPEFFECT CTTDropTarget<DataType>::OnDropEx(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropDefault, DROPEFFECT dropList, CPoint point)
{
// Skip this handler and let "OnDrop" handle an event
return (DROPEFFECT)-1;
}
// Called when mouse button is released, OnDropEx() returns -1 and dropEffect != DROPEFFECT_NONE.
// dropEffect is the value returned by OnDragOver() called just before this.
// OnDragLeave() is not called. So it may be necessary to perform cleanup here.
// Return TRUE when data has been dropped.
// The drop effect passed to the DoDragDrop() call of the source is dropEffect
// when returning TRUE here or DROPEFFECT_NONE when returning FALSE.
template<typename DataType>
BOOL CTTDropTarget<DataType>::OnDrop(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point)
{
BOOL bRet = FALSE;
/*if (m_pDataObject == NULL)
return bRet;*/
//ResolveDataObject(pDataObject);
DragParameters Params = { 0 };
Params.dropEffect = dropEffect;
Params.point = point;
bRet = static_cast<BOOL>(pWnd->SendMessage(TWM_DROP,
reinterpret_cast<WPARAM>(this),
reinterpret_cast<LPARAM>(&Params)));
return bRet;
}
// This is called before OnDragEnter() and OnDragOver().
// Implemented functions should return:
// - DROPEFFECT_NONE:
// When not scrolling or not handling the event.
// - DROPEFFECT_SCROLL with DROPEFFECT_COPY, DROPEFFECT_MOVE, or DROPEFFECT_LINK.
// When scrolling is active.
// NOTE:
// When the value returned here has the DROPEFFECT_SCROLL bit set indicating
// that scrolling is active, OnDragEnter() and OnDragOver() are not called afterwards.
template<typename DataType>
DROPEFFECT CTTDropTarget<DataType>::OnDragScroll(CWnd* pWnd, DWORD dwKeyState, CPoint point)
{
DROPEFFECT dwEffect = DROPEFFECT_NONE;
/*if (m_pDataObject == NULL)
return dwEffect;*/
DragParameters Params = { 0 };
Params.dwKeyState = dwKeyState;
Params.point = point;
dwEffect = static_cast<DROPEFFECT>(pWnd->SendMessage(
TWM_DRAG_SCROLL,
reinterpret_cast<WPARAM>(this),
reinterpret_cast<LPARAM>(&Params)));
return dwEffect;
}
template<typename DataType>
DataType* CTTDropTarget<DataType>::GetDataObject()
{
return m_pDataObject;
//return &m_DataObject;
}
template<typename DataType>
LPVOID CTTDropTarget<DataType>::GetLpDataObject()
{
return m_lpDataObject;
}
template<typename DataType>
void CTTDropTarget<DataType>::ResolveDataObject(COleDataObject* pDataObject)
{
/*if (m_pDataObject)
delete m_pDataObject;*/
//ZeroMemory(&m_DataObject, sizeof(DataType));
m_pDataObject = NULL;
m_dwSize = 0;
if (pDataObject == NULL)
return;
if (!pDataObject->IsDataAvailable(m_CBFormat.cfFormat))
return;
/*STGMEDIUM iMedium;
ZeroMemory(&iMedium, sizeof(STGMEDIUM));*/
HGLOBAL hGlobal = pDataObject->GetGlobalData(m_CBFormat.cfFormat);
/*if (dwSize != sizeof(DataType))
return;*/
if (hGlobal && false)
{
TRACE(_T("HGLOBAL after: %p\n"), hGlobal);
DWORD dwSize = GlobalSize(hGlobal);
m_dwSize = dwSize;
LPVOID lpGlobal = GlobalLock(hGlobal);
ASSERT(AfxIsValidAddress(lpGlobal, dwSize, FALSE));
//ASSERT(sizeof(DataType) == dwSize);
unsigned char* b = new unsigned char [dwSize];
CopyMemory(b, lpGlobal, dwSize);
m_pDataObject = reinterpret_cast<DataType*>(b);
//swapPtr(m_pDataObject, b);
//m_pDataObject = new DataType();
//m_pDataObject = static_cast<DataType*>(lpGlobal);
//CopyMemory(b, lpGlobal, dwSize);
//m_pDataObject = static_cast<DataType*>(static_cast<void*>(b));
/*m_lpDataObject = malloc(dwSize);
//m_pDataObject = new DataType();
//BYTE* pByte = new BYTE[dwSize];
CopyMemory(m_lpDataObject, lpGlobal, dwSize);*/
//m_pDataObject = reinterpret_cast<DataType*>(pByte);
//delete pByte;
//m_pDataObject = new DataType();
//CopyMemory(m_pDataObject, lpGlobal, dwSize);
GlobalUnlock(hGlobal);
}
/*if (!pDataObject->GetData(m_CBFormat.cfFormat, &iMedium, &m_CBFormat))
return;
DWORD dwSize = ::GlobalSize(iMedium.hGlobal);
if (dwSize != sizeof(DataType))
return;
::GlobalLock(iMedium.hGlobal);
::CopyMemory(&m_DataObject, m_pDataObject, dwSize);
::GlobalUnlock(iMedium.hGlobal);
if (iMedium.pUnkForRelease != NULL)
iMedium.pUnkForRelease->Release();*/
}
template<typename DataType>
DWORD CTTDropTarget<DataType>::GetSize()
{
return m_dwSize;
}
/*void swapPtr(void*& p1, void*& p2)
{
p1 = p2;
}*/