mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
562 lines
14 KiB
562 lines
14 KiB
#include "droptgt.h"
|
|
|
|
#define TF_DRAGDROP TF_BAND
|
|
|
|
|
|
#define MAX_DROPTARGETS 3
|
|
|
|
class CDropTargetWrap : public IDropTarget
|
|
{
|
|
public:
|
|
// *** IUnknown ***
|
|
virtual STDMETHODIMP_(ULONG) AddRef(void);
|
|
virtual STDMETHODIMP_(ULONG) Release(void);
|
|
virtual STDMETHODIMP QueryInterface(REFIID riid, LPVOID * ppvObj);
|
|
|
|
// *** IDropTarget methods ***
|
|
virtual STDMETHODIMP DragEnter(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
|
|
virtual STDMETHODIMP DragOver(DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
|
|
virtual STDMETHODIMP DragLeave(void);
|
|
virtual STDMETHODIMP Drop(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect);
|
|
|
|
CDropTargetWrap(IDropTarget** ppdtg, HWND hwnd);
|
|
protected:
|
|
~CDropTargetWrap();
|
|
|
|
private:
|
|
int _cRef;
|
|
|
|
int _count;
|
|
IDropTarget* _rgpdt[MAX_DROPTARGETS];
|
|
DWORD _rgdwEffect[MAX_DROPTARGETS];
|
|
HWND _hwnd;
|
|
};
|
|
|
|
CDropTargetWrap::CDropTargetWrap(IDropTarget** ppdt, HWND hwnd)
|
|
: _hwnd(hwnd)
|
|
{
|
|
_cRef = 1;
|
|
|
|
for (int i = 0; i < MAX_DROPTARGETS; i++, ppdt++) {
|
|
if (*ppdt) {
|
|
_rgpdt[_count] = *ppdt;
|
|
_rgpdt[_count]->AddRef();
|
|
_count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
CDropTargetWrap::~CDropTargetWrap()
|
|
{
|
|
for (int i = 0 ; i < _count ; i++)
|
|
{
|
|
_rgpdt[i]->Release();
|
|
}
|
|
}
|
|
|
|
IDropTarget* DropTargetWrap_CreateInstance(IDropTarget* pdtPrimary, IDropTarget* pdtSecondary, HWND hwnd, IDropTarget* pdt3)
|
|
{
|
|
// no point in wrapping nothing...
|
|
if (pdtPrimary || pdtSecondary || pdt3)
|
|
{
|
|
IDropTarget* pdt[MAX_DROPTARGETS] = { pdtPrimary, pdtSecondary, pdt3 };
|
|
|
|
CDropTargetWrap* pdtw = new CDropTargetWrap(pdt, hwnd);
|
|
if (pdtw)
|
|
{
|
|
return SAFECAST(pdtw, IDropTarget*);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
HRESULT CDropTargetWrap::QueryInterface(REFIID riid, void **ppvObj)
|
|
{
|
|
static const QITAB qit[] = {
|
|
QITABENT(CDropTargetWrap, IDropTarget),
|
|
{ 0 },
|
|
};
|
|
|
|
return QISearch(this, qit, riid, ppvObj);
|
|
}
|
|
|
|
ULONG CDropTargetWrap::AddRef(void)
|
|
{
|
|
_cRef++;
|
|
return _cRef;
|
|
}
|
|
|
|
ULONG CDropTargetWrap::Release(void)
|
|
{
|
|
_cRef--;
|
|
if (_cRef > 0)
|
|
return _cRef;
|
|
|
|
delete this;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::DragEnter method
|
|
|
|
The *pdwEffect that is returned is the first valid value
|
|
of all the drop targets' returned effects.
|
|
|
|
*/
|
|
HRESULT CDropTargetWrap::DragEnter(IDataObject *pdtobj, DWORD grfKeyState, POINTL ptl, DWORD *pdwEffect)
|
|
{
|
|
DWORD dwEffectOut = DROPEFFECT_NONE;
|
|
|
|
for (int i = 0 ; i < _count ; i++)
|
|
{
|
|
_rgdwEffect[i] = *pdwEffect;
|
|
|
|
if (SUCCEEDED(_rgpdt[i]->DragEnter(pdtobj, grfKeyState, ptl, &_rgdwEffect[i])))
|
|
{
|
|
if (dwEffectOut == DROPEFFECT_NONE)
|
|
{
|
|
dwEffectOut = _rgdwEffect[i];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
_rgdwEffect[i] = DROPEFFECT_NONE;
|
|
}
|
|
}
|
|
*pdwEffect = dwEffectOut;
|
|
return(S_OK);
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::DragOver method
|
|
|
|
*/
|
|
HRESULT CDropTargetWrap::DragOver(DWORD grfKeyState, POINTL ptl, DWORD *pdwEffect)
|
|
{
|
|
DWORD dwEffectOut = DROPEFFECT_NONE;
|
|
|
|
for (int i = 0 ; i < _count ; i++)
|
|
{
|
|
_rgdwEffect[i] = *pdwEffect;
|
|
|
|
if (SUCCEEDED(_rgpdt[i]->DragOver(grfKeyState, ptl, &_rgdwEffect[i])))
|
|
{
|
|
if (dwEffectOut == DROPEFFECT_NONE)
|
|
dwEffectOut = _rgdwEffect[i];
|
|
}
|
|
else
|
|
{
|
|
_rgdwEffect[i] = DROPEFFECT_NONE;
|
|
}
|
|
}
|
|
|
|
*pdwEffect = dwEffectOut;
|
|
return(S_OK);
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::DragLeave method
|
|
|
|
*/
|
|
HRESULT CDropTargetWrap::DragLeave(void)
|
|
{
|
|
for (int i = 0 ; i < _count ; i++)
|
|
{
|
|
_rgpdt[i]->DragLeave();
|
|
}
|
|
|
|
return(S_OK);
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::Drop method
|
|
|
|
*/
|
|
HRESULT CDropTargetWrap::Drop(IDataObject *pdtobj, DWORD grfKeyState, POINTL pt, DWORD *pdwEffect)
|
|
{
|
|
DWORD dwEffectOut = DROPEFFECT_NONE;
|
|
int i;
|
|
BOOL fDropTried = FALSE;
|
|
|
|
for (i = 0 ; (DROPEFFECT_NONE == dwEffectOut) && i < _count ; i++)
|
|
{
|
|
if ((_rgdwEffect[i] && *pdwEffect) && !fDropTried)
|
|
{
|
|
dwEffectOut = *pdwEffect;
|
|
_rgpdt[i]->Drop(pdtobj, grfKeyState, pt, &dwEffectOut);
|
|
fDropTried = TRUE;
|
|
}
|
|
else
|
|
{
|
|
_rgpdt[i]->DragLeave();
|
|
}
|
|
}
|
|
|
|
*pdwEffect = dwEffectOut;
|
|
return(S_OK);
|
|
}
|
|
|
|
|
|
//=============================================================================
|
|
// CDelegateDropTarget
|
|
//
|
|
// This class implements IDropTarget given an IDelegateDropTargetCB interface.
|
|
// It handles all hit testing, caching, and scrolling for you.
|
|
//
|
|
//=============================================================================
|
|
#undef CDropTargetWrap
|
|
|
|
CDelegateDropTarget::CDelegateDropTarget()
|
|
{
|
|
TraceMsg(TF_SHDLIFE, "ctor CDelegateDropTarget %x", this);
|
|
|
|
}
|
|
|
|
CDelegateDropTarget::~CDelegateDropTarget()
|
|
{
|
|
TraceMsg(TF_SHDLIFE, "dtor CDelegateDropTarget %x", this);
|
|
|
|
ASSERT(!_pDataObj);
|
|
ATOMICRELEASE(_pDataObj);
|
|
ASSERT(!_pdtCur);
|
|
ATOMICRELEASE(_pdtCur);
|
|
}
|
|
|
|
HRESULT CDelegateDropTarget::Init()
|
|
{
|
|
HRESULT hres = GetWindowsDDT(&_hwndLock, &_hwndScroll);
|
|
// We lock _hwndLock and do scrolling against _hwndScroll.
|
|
// These can be different hwnds, but certain restrictions apply:
|
|
if (_hwndLock != _hwndScroll)
|
|
{
|
|
BOOL fValid = IsChild(_hwndLock, _hwndScroll);
|
|
if (!fValid)
|
|
{
|
|
TraceMsg(TF_DRAGDROP, "ctor CDelegateDropTarget: invalid windows %x and %x!", _hwndLock, _hwndScroll);
|
|
_hwndLock = _hwndScroll = NULL;
|
|
}
|
|
}
|
|
return hres;
|
|
}
|
|
|
|
void CDelegateDropTarget::_ReleaseCurrentDropTarget()
|
|
{
|
|
if (_pdtCur)
|
|
{
|
|
_pdtCur->DragLeave();
|
|
ATOMICRELEASE(_pdtCur);
|
|
}
|
|
}
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::DragEnter method
|
|
|
|
*/
|
|
HRESULT CDelegateDropTarget::DragEnter(IDataObject *pdtobj, DWORD grfKeyState, POINTL ptl, LPDWORD pdwEffect)
|
|
{
|
|
// We can be re-entered due to ui on thread
|
|
if (_pDataObj != NULL)
|
|
{
|
|
TraceMsg(TF_DRAGDROP, "CDelegateDropTarget::DragEnter called a second time!");
|
|
*pdwEffect = DROPEFFECT_NONE;
|
|
return S_OK;
|
|
}
|
|
TraceMsg(TF_DRAGDROP, "CDelegateDropTarget::DragEnter with *pdwEffect=%x", *pdwEffect);
|
|
|
|
ASSERT(!_pDataObj);
|
|
_pDataObj = pdtobj;
|
|
_pDataObj->AddRef();
|
|
|
|
// cache state
|
|
//
|
|
// wait until first DragOver to get valid info
|
|
//
|
|
_fPrime = FALSE;
|
|
_dwEffectOut = DROPEFFECT_NONE;
|
|
|
|
// set up auto-scroll info
|
|
//
|
|
ASSERT(pdtobj);
|
|
_DragEnter(_hwndLock, ptl, pdtobj);
|
|
|
|
DAD_InitScrollData(&_asd);
|
|
|
|
_ptLast.x = _ptLast.y = 0x7fffffff; // put bogus value to force redraw
|
|
|
|
HitTestDDT(HTDDT_ENTER, NULL, NULL, NULL);
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::DragOver method
|
|
|
|
*/
|
|
HRESULT CDelegateDropTarget::DragOver(DWORD grfKeyState, POINTL ptl, LPDWORD pdwEffect)
|
|
{
|
|
HRESULT hres = S_OK;
|
|
DWORD_PTR itemNew;
|
|
POINT pt;
|
|
DWORD dwEffectScroll = 0;
|
|
DWORD dwEffectOut = 0;
|
|
BOOL fSameImage = FALSE;
|
|
DWORD dwCustDropEffect = 0;
|
|
|
|
if (_pDataObj == NULL)
|
|
{
|
|
ASSERT(0); // DragEnter should be called before.
|
|
return E_FAIL;
|
|
}
|
|
|
|
// convert to window coords
|
|
pt.x = ptl.x;
|
|
pt.y = ptl.y;
|
|
ScreenToClient(_hwndScroll, &pt);
|
|
|
|
if (DAD_AutoScroll(_hwndScroll, &_asd, &pt))
|
|
dwEffectScroll = DROPEFFECT_SCROLL;
|
|
|
|
//
|
|
// If we are dragging over on a different item, get its IDropTarget
|
|
// interface or adjust itemNew to -1.
|
|
//
|
|
if (SUCCEEDED(HitTestDDT(HTDDT_OVER, &pt, &itemNew, &dwCustDropEffect)) &&
|
|
(itemNew != _itemOver || !_fPrime))
|
|
{
|
|
_fPrime = TRUE;
|
|
|
|
_ReleaseCurrentDropTarget();
|
|
|
|
_itemOver = itemNew;
|
|
GetObjectDDT(_itemOver, IID_IDropTarget, (LPVOID*)&_pdtCur);
|
|
|
|
if (_pdtCur)
|
|
{
|
|
// There's an IDropTarget for this hit, use it
|
|
dwEffectOut = *pdwEffect;
|
|
|
|
hres = _pdtCur->DragEnter(_pDataObj, grfKeyState, ptl, &dwEffectOut);
|
|
if (FAILED(hres))
|
|
dwEffectOut = DROPEFFECT_NONE;
|
|
}
|
|
else
|
|
{
|
|
// No IDropTarget, no effect
|
|
dwEffectOut = DROPEFFECT_NONE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// No change in the selection. We assume that *pdwEffect stays
|
|
// the same during the same drag-loop as long as the key state doesn't change.
|
|
//
|
|
if ((_grfKeyState != grfKeyState) && _pdtCur)
|
|
{
|
|
dwEffectOut = *pdwEffect;
|
|
|
|
hres = _pdtCur->DragOver(grfKeyState, ptl, &dwEffectOut);
|
|
|
|
TraceMsg(TF_DRAGDROP, "CDelegateDropTarget::DragOver DragOver()d id:%d dwEffect:%4x hres:%d", _itemOver, dwEffectOut, hres);
|
|
}
|
|
else
|
|
{
|
|
// Same item and same key state. Use the previous dwEffectOut.
|
|
dwEffectOut = _dwEffectOut;
|
|
fSameImage = TRUE;
|
|
}
|
|
}
|
|
|
|
_grfKeyState = grfKeyState; // store these for the next Drop
|
|
_dwEffectOut = dwEffectOut; // and DragOver
|
|
|
|
// Is the Custdrop effect valid ?
|
|
if (dwCustDropEffect != DROPEFFECT_NONE)
|
|
{
|
|
//Yes then set the effect to Custdrop effect along with scroll effect
|
|
*pdwEffect = dwCustDropEffect | dwEffectScroll;
|
|
}
|
|
else
|
|
{
|
|
//No , set the effect to dwEffectOut along with scroll effect
|
|
*pdwEffect = dwEffectOut | dwEffectScroll;
|
|
}
|
|
TraceMsg(TF_DRAGDROP, "CDelegateDropTarget::DragOver (*pdwEffect=%x)", *pdwEffect);
|
|
|
|
|
|
if (!(fSameImage && pt.x==_ptLast.x && pt.y==_ptLast.y))
|
|
{
|
|
_DragMove(_hwndLock, ptl);
|
|
_ptLast.x = ptl.x;
|
|
_ptLast.y = ptl.y;
|
|
}
|
|
return hres;
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::DragLeave method
|
|
|
|
*/
|
|
HRESULT CDelegateDropTarget::DragLeave()
|
|
{
|
|
HitTestDDT(HTDDT_LEAVE, NULL, NULL, NULL);
|
|
_ReleaseCurrentDropTarget();
|
|
|
|
TraceMsg(TF_DRAGDROP, "CDelegateDropTarget::DragLeave");
|
|
ATOMICRELEASE(_pDataObj);
|
|
|
|
DAD_DragLeave();
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::Drop method
|
|
|
|
*/
|
|
HRESULT CDelegateDropTarget::Drop(IDataObject *pdtobj,
|
|
DWORD grfKeyState, POINTL pt, LPDWORD pdwEffect)
|
|
{
|
|
HRESULT hres = S_OK;
|
|
BOOL bDropHandled = FALSE;
|
|
|
|
TraceMsg(TF_DRAGDROP, "CDelegateDropTarget::Drop (*pdwEffect=%x)", *pdwEffect);
|
|
|
|
//
|
|
// According to AlexGo (OLE), this is by-design. We should make it sure
|
|
// that we use pdtobj instead of pdtobj.
|
|
//
|
|
//ASSERT(pdtobj == _pDataObj);
|
|
pdtobj->AddRef();
|
|
_pDataObj->Release();
|
|
_pDataObj = pdtobj;
|
|
|
|
//
|
|
// Note that we don't use the drop position intentionally,
|
|
// so that it matches to the last destination feedback.
|
|
//
|
|
if (_pdtCur)
|
|
{
|
|
// use this local because if _pdtCur::Drop does a UnlockWindow
|
|
// then hits an error and needs to put up a dialog,
|
|
// we could get re-entered
|
|
IDropTarget *pdtCur = _pdtCur;
|
|
_pdtCur = NULL;
|
|
|
|
// HACK ALERT!!!!
|
|
//
|
|
// If we don't call LVUtil_DragEnd here, we'll be able to leave
|
|
// dragged icons visible when the menu is displayed. However, because
|
|
// we are calling IDropTarget::Drop() which may create some modeless
|
|
// dialog box or something, we can not ensure the locked state of
|
|
// the list view -- LockWindowUpdate() can lock only one window at
|
|
// a time. Therefore, we skip this call only if the _pdtCur
|
|
// is a subclass of CIDLDropTarget, assuming its Drop calls
|
|
// CDefView::DragEnd (or CIDLDropTarget_DragDropMenu) appropriately.
|
|
//
|
|
#if 0 // later
|
|
if (!IsIDLDropTarget(pdtCur))
|
|
#endif
|
|
{
|
|
//
|
|
// This will hide the dragged image.
|
|
//
|
|
DAD_DragLeave();
|
|
|
|
//
|
|
// We need to reset the drag image list so that the user
|
|
// can start another drag&drop while we are in this
|
|
// Drop() member function call.
|
|
//
|
|
// NOTE: we don't have to worry about the DAD_DragLeave
|
|
// (called from during the DragLeave call at the end of
|
|
// this function) cancelling the potential above-mentioned
|
|
// drag&drop loop. If such a beast is going on, it should
|
|
// complete before pdtCur->Drop returns.
|
|
//
|
|
DAD_SetDragImage(NULL, NULL);
|
|
}
|
|
|
|
if (S_FALSE != OnDropDDT(pdtCur, _pDataObj, &grfKeyState, pt, pdwEffect))
|
|
pdtCur->Drop(_pDataObj, grfKeyState, pt, pdwEffect);
|
|
else
|
|
pdtCur->DragLeave(); // should be okay even if OnDrop did this already
|
|
|
|
pdtCur->Release();
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// We come here if Drop is called without DragMove (with DragEnter).
|
|
//
|
|
*pdwEffect = DROPEFFECT_NONE;
|
|
}
|
|
|
|
//
|
|
// Clean up everything (OLE won't call DragLeave after Drop).
|
|
//
|
|
DragLeave();
|
|
|
|
return hres;
|
|
}
|
|
|
|
// ******************************************************************
|
|
// dummy drop target to only call DAD_DragEnterEx() on DragEnter();
|
|
// ******************************************************************
|
|
|
|
HRESULT CDropDummy::QueryInterface(REFIID riid, void **ppvObj)
|
|
{
|
|
static const QITAB qit[] = {
|
|
QITABENT(CDropDummy, IDropTarget),
|
|
{ 0 },
|
|
};
|
|
|
|
return QISearch(this, qit, riid, ppvObj);
|
|
}
|
|
|
|
ULONG CDropDummy::AddRef(void)
|
|
{
|
|
_cRef++;
|
|
return _cRef;
|
|
}
|
|
|
|
ULONG CDropDummy::Release(void)
|
|
{
|
|
_cRef--;
|
|
if (_cRef > 0)
|
|
return _cRef;
|
|
|
|
delete this;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*----------------------------------------------------------
|
|
Purpose: IDropTarget::DragEnter method
|
|
|
|
simply call DAD_DragEnterEx2() to get custom drag cursor
|
|
drawing.
|
|
|
|
*/
|
|
HRESULT CDropDummy::DragEnter(IDataObject *pdtobj, DWORD grfKeyState, POINTL ptl, DWORD *pdwEffect)
|
|
{
|
|
ASSERT(pdtobj);
|
|
_DragEnter(_hwndLock, ptl, pdtobj);
|
|
*pdwEffect = DROPEFFECT_NONE;
|
|
return(S_OK);
|
|
}
|
|
|
|
HRESULT CDropDummy::DragOver(DWORD grfKeyState, POINTL ptl, DWORD *pdwEffect)
|
|
{
|
|
_DragMove(_hwndLock, ptl);
|
|
*pdwEffect = DROPEFFECT_NONE;
|
|
return S_OK;
|
|
}
|
|
|