implementation of IDropTarget interface More...

#include <dragdropimpl.h>

Inheritance diagram for IDropTargetImpl:

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Collaboration diagram for IDropTargetImpl:

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Public Member Functions
	IDropTargetImpl (HWND m_hTargetWnd)

virtual	~IDropTargetImpl ()

void	AddSuportedFormat (FORMATETC &ftetc)

virtual bool	OnDrop (FORMATETC pFmtEtc, STGMEDIUM &medium, DWORD pdwEffect)=0

virtual HRESULT STDMETHODCALLTYPE	QueryInterface (REFIID riid, void __RPC_FAR __RPC_FAR ppvObject)

virtual ULONG STDMETHODCALLTYPE	AddRef ()

virtual ULONG STDMETHODCALLTYPE	Release ()

bool	QueryDrop (DWORD grfKeyState, LPDWORD pdwEffect)

virtual HRESULT STDMETHODCALLTYPE	DragEnter (IDataObject __RPC_FAR pDataObj, DWORD grfKeyState, POINTL pt, DWORD __RPC_FAR pdwEffect)

virtual HRESULT STDMETHODCALLTYPE	DragOver (DWORD grfKeyState, POINTL pt, DWORD __RPC_FAR *pdwEffect)

virtual HRESULT STDMETHODCALLTYPE	DragLeave ()

virtual HRESULT STDMETHODCALLTYPE	Drop (IDataObject __RPC_FAR pDataObj, DWORD grfKeyState, POINTL pt, DWORD __RPC_FAR pdwEffect)

Public Member Functions inherited from IDropTarget
HRESULT	DragEnter ([in, unique] IDataObject pDataObj, [in] DWORD grfKeyState, [in] POINTL pt, [in, out] DWORD pdwEffect)

HRESULT	DragOver ([in] DWORD grfKeyState, [in] POINTL pt, [in, out] DWORD *pdwEffect)

HRESULT	DragLeave ()

HRESULT	Drop ([in, unique] IDataObject pDataObj, [in] DWORD grfKeyState, [in] POINTL pt, [in, out] DWORD pdwEffect)

Public Member Functions inherited from IUnknown
HRESULT	QueryInterface ([in] REFIID riid, [out, iid_is(riid)] void **ppvObject)

ULONG	AddRef ()

ULONG	Release ()

Protected Attributes
HWND	m_hTargetWnd

Private Attributes
DWORD	m_cRefCount

bool	m_bAllowDrop

IDropTargetHelper *	m_pDropTargetHelper

FormatArray	m_formatetc

FORMATETC *	m_pSupportedFrmt

Additional Inherited Members
Public Types inherited from IDropTarget
typedef IDropTarget *	LPDROPTARGET

Public Types inherited from IUnknown
typedef IUnknown *	LPUNKNOWN

Public Attributes inherited from IDropTarget
const DWORD	MK_ALT = 0x20

const DWORD	DROPEFFECT_NONE = 0

const DWORD	DROPEFFECT_COPY = 1

const DWORD	DROPEFFECT_MOVE = 2

const DWORD	DROPEFFECT_LINK = 4

const DWORD	DROPEFFECT_SCROLL = 0x80000000

const DWORD	DD_DEFSCROLLINSET = 11

const DWORD	DD_DEFSCROLLDELAY = 50

const DWORD	DD_DEFSCROLLINTERVAL = 50

const DWORD	DD_DEFDRAGDELAY = 200

const DWORD	DD_DEFDRAGMINDIST = 2

Detailed Description

implementation of IDropTarget interface

Definition at line 168 of file dragdropimpl.h.

Constructor & Destructor Documentation

◆ IDropTargetImpl()

IDropTargetImpl::IDropTargetImpl ( HWND m_hTargetWnd )

Definition at line 331 of file dragdropimpl.cpp.

 :  m_cRefCount(0),
    m_bAllowDrop(false),
    m_pDropTargetHelper(NULL),
    m_pSupportedFrmt(NULL),
    m_hTargetWnd(hTargetWnd)
{
    assert(m_hTargetWnd != NULL);
 
    if (FAILED(CoCreateInstance(CLSID_DragDropHelper, NULL, CLSCTX_INPROC_SERVER,
                     IID_IDropTargetHelper,(LPVOID*)&m_pDropTargetHelper)))
        m_pDropTargetHelper = NULL;
}

◆ ~IDropTargetImpl()

IDropTargetImpl::~IDropTargetImpl ( )

virtual

Definition at line 345 of file dragdropimpl.cpp.

{
    if (m_pDropTargetHelper != NULL)
    {
        m_pDropTargetHelper->Release();
        m_pDropTargetHelper = NULL;
    }
}

Member Function Documentation

◆ AddRef()

virtual ULONG STDMETHODCALLTYPE IDropTargetImpl::AddRef ( void )

inlinevirtual

Implements IUnknown.

Definition at line 192 of file dragdropimpl.h.

192{return ++m_cRefCount;}

Referenced by DesktopShellView::InitDragDrop(), and ShellBrowser::InitDragDrop().

◆ AddSuportedFormat()

void IDropTargetImpl::AddSuportedFormat ( FORMATETC & ftetc )

inline

Definition at line 184 of file dragdropimpl.h.

184{m_formatetc.push_back(ftetc);}

IDropTargetImpl::m_formatetc

FormatArray m_formatetc

Definition: dragdropimpl.h:174

vector::push_back

void push_back(const _Tp &__x=_STLP_DEFAULT_CONSTRUCTED(_Tp))

Definition: _vector.h:379

Referenced by DesktopShellView::InitDragDrop(), and ShellBrowser::InitDragDrop().

◆ DragEnter()

HRESULT STDMETHODCALLTYPE IDropTargetImpl::DragEnter	(	IDataObject __RPC_FAR *	pDataObj,
		DWORD	grfKeyState,
		POINTL	pt,
		DWORD __RPC_FAR *	pdwEffect
	)

virtual

Definition at line 424 of file dragdropimpl.cpp.

{
    if (pDataObj == NULL)
        return E_INVALIDARG;
 
    if (m_pDropTargetHelper)
        m_pDropTargetHelper->DragEnter(m_hTargetWnd, pDataObj, (LPPOINT)&pt, *pdwEffect);
 
    //IEnumFORMATETC* pEnum;
    //pDataObj->EnumFormatEtc(DATADIR_GET,&pEnum);
    //FORMATETC ftm;
    //for()
    //pEnum->Next(1,&ftm,0);
    //pEnum->Release();
    m_pSupportedFrmt = NULL;
 
    for(FormatArray::iterator it=m_formatetc.begin(); it!=m_formatetc.end(); ++it)
    {
        m_bAllowDrop = (pDataObj->QueryGetData(&*it) == S_OK)? true: false;
 
        if (m_bAllowDrop)
        {
            m_pSupportedFrmt = &*it;
            break;
        }
    }
 
    QueryDrop(grfKeyState, pdwEffect);
 
    return S_OK;
}

◆ DragLeave()

HRESULT STDMETHODCALLTYPE IDropTargetImpl::DragLeave ( void )

virtual

Implements IDropTarget.

Reimplemented in DesktopDropTarget, and TreeDropTarget.

Definition at line 473 of file dragdropimpl.cpp.

{
    if (m_pDropTargetHelper)
        m_pDropTargetHelper->DragLeave();
 
    m_bAllowDrop = false;
    m_pSupportedFrmt = NULL;
 
    return S_OK;
}

Referenced by DesktopDropTarget::DragLeave(), and TreeDropTarget::DragLeave().

◆ DragOver()

HRESULT STDMETHODCALLTYPE IDropTargetImpl::DragOver	(	DWORD	grfKeyState,
		POINTL	pt,
		DWORD __RPC_FAR *	pdwEffect
	)

virtual

Reimplemented in DesktopDropTarget, and TreeDropTarget.

Definition at line 460 of file dragdropimpl.cpp.

{
    if (m_pDropTargetHelper)
        m_pDropTargetHelper->DragOver((LPPOINT)&pt, *pdwEffect);
 
    QueryDrop(grfKeyState, pdwEffect);
 
    return S_OK;
}

Referenced by DesktopDropTarget::DragOver(), and TreeDropTarget::DragOver().

◆ Drop()

HRESULT STDMETHODCALLTYPE IDropTargetImpl::Drop	(	IDataObject __RPC_FAR *	pDataObj,
		DWORD	grfKeyState,
		POINTL	pt,
		DWORD __RPC_FAR *	pdwEffect
	)

virtual

Definition at line 484 of file dragdropimpl.cpp.

{
    if (pDataObj == NULL)
        return E_INVALIDARG;
 
    if (m_pDropTargetHelper)
        m_pDropTargetHelper->Drop(pDataObj, (LPPOINT)&pt, *pdwEffect);
 
    if (QueryDrop(grfKeyState, pdwEffect))
    {
        if (m_bAllowDrop && m_pSupportedFrmt != NULL)
        {
            STGMEDIUM medium;
 
            if (pDataObj->GetData(m_pSupportedFrmt, &medium) == S_OK)
            {
                if (OnDrop(m_pSupportedFrmt, medium, pdwEffect)) //does derive class wants us to free medium?
                    ReleaseStgMedium(&medium);
            }
        }
    }
 
    m_bAllowDrop = false;
    *pdwEffect = DROPEFFECT_NONE;
    m_pSupportedFrmt = NULL;
 
    return S_OK;
}

◆ OnDrop()

virtual bool IDropTargetImpl::OnDrop	(	FORMATETC *	pFmtEtc,
		STGMEDIUM &	medium,
		DWORD *	pdwEffect
	)

pure virtual

Implemented in DesktopDropTarget, and TreeDropTarget.

Referenced by Drop().

◆ QueryDrop()

bool IDropTargetImpl::QueryDrop	(	DWORD	grfKeyState,
		LPDWORD	pdwEffect
	)

Definition at line 382 of file dragdropimpl.cpp.

{
    DWORD dwOKEffects = *pdwEffect;
 
    if (!m_bAllowDrop)
    {
       *pdwEffect = DROPEFFECT_NONE;
       return false;
    }
 
    //CTRL+SHIFT  -- DROPEFFECT_LINK
    //CTRL        -- DROPEFFECT_COPY
    //SHIFT       -- DROPEFFECT_MOVE
    //no modifier -- DROPEFFECT_MOVE or whatever is allowed by src
    *pdwEffect = (grfKeyState & MK_CONTROL) ?
                 ( (grfKeyState & MK_SHIFT) ? DROPEFFECT_LINK : DROPEFFECT_COPY ):
                 ( (grfKeyState & MK_SHIFT) ? DROPEFFECT_MOVE : DROPEFFECT_NONE );
    if (*pdwEffect == 0)
    {
       // No modifier keys used by user while dragging.
       if (DROPEFFECT_COPY & dwOKEffects)
          *pdwEffect = DROPEFFECT_COPY;
       else if (DROPEFFECT_MOVE & dwOKEffects)
          *pdwEffect = DROPEFFECT_MOVE;
       else if (DROPEFFECT_LINK & dwOKEffects)
          *pdwEffect = DROPEFFECT_LINK;
       else
       {
          *pdwEffect = DROPEFFECT_NONE;
       }
    }
    else
    {
       // Check if the drag source application allows the drop effect desired by user.
       // The drag source specifies this in DoDragDrop
       if (!(*pdwEffect & dwOKEffects))
          *pdwEffect = DROPEFFECT_NONE;
    }
 
    return (DROPEFFECT_NONE == *pdwEffect)?false:true;
}

Referenced by DragEnter(), DragOver(), and Drop().

◆ QueryInterface()

HRESULT STDMETHODCALLTYPE IDropTargetImpl::QueryInterface	(	REFIID	riid,
		void __RPC_FAR __RPC_FAR	ppvObject
	)

virtual

Definition at line 354 of file dragdropimpl.cpp.

{
    *ppvObject = NULL;
    if (IID_IUnknown==riid || IID_IDropTarget==riid)
        *ppvObject=this;
 
    if (*ppvObject != NULL)
    {
        ((LPUNKNOWN)*ppvObject)->AddRef();
        return S_OK;
    }
 
    return E_NOINTERFACE;
}

◆ Release()

ULONG STDMETHODCALLTYPE IDropTargetImpl::Release ( void )

virtual

Implements IUnknown.

Definition at line 370 of file dragdropimpl.cpp.

{
   long nTemp = --m_cRefCount;
 
   assert(nTemp >= 0);
 
   if (nTemp == 0)
      delete this;
 
   return nTemp;
}

Referenced by DesktopShellView::InitDragDrop(), ShellBrowser::InitDragDrop(), and ShellBrowser::~ShellBrowser().

Member Data Documentation

◆ m_bAllowDrop

bool IDropTargetImpl::m_bAllowDrop

private

Definition at line 171 of file dragdropimpl.h.

Referenced by DragEnter(), DragLeave(), Drop(), and QueryDrop().

◆ m_cRefCount

DWORD IDropTargetImpl::m_cRefCount

private

Definition at line 170 of file dragdropimpl.h.

Referenced by AddRef(), and Release().

◆ m_formatetc

FormatArray IDropTargetImpl::m_formatetc

private

Definition at line 174 of file dragdropimpl.h.

Referenced by AddSuportedFormat(), and DragEnter().

◆ m_hTargetWnd

HWND IDropTargetImpl::m_hTargetWnd

protected

Definition at line 178 of file dragdropimpl.h.

Referenced by DragEnter(), TreeDropTarget::DragLeave(), DesktopDropTarget::DragOver(), TreeDropTarget::DragOver(), IDropTargetImpl(), and TreeDropTarget::OnDrop().

◆ m_pDropTargetHelper

IDropTargetHelper* IDropTargetImpl::m_pDropTargetHelper

private

Definition at line 172 of file dragdropimpl.h.

Referenced by DragEnter(), DragLeave(), DragOver(), Drop(), IDropTargetImpl(), and ~IDropTargetImpl().

◆ m_pSupportedFrmt

FORMATETC* IDropTargetImpl::m_pSupportedFrmt

private

Definition at line 175 of file dragdropimpl.h.

Referenced by DragEnter(), DragLeave(), and Drop().

The documentation for this class was generated from the following files:

modules/rosapps/applications/explorer-old/utility/dragdropimpl.h
modules/rosapps/applications/explorer-old/utility/dragdropimpl.cpp

Public Member Functions

Protected Attributes

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ IDropTargetImpl()

◆ ~IDropTargetImpl()

Member Function Documentation

◆ AddRef()

◆ AddSuportedFormat()

◆ DragEnter()

◆ DragLeave()

◆ DragOver()

◆ Drop()

◆ OnDrop()

◆ QueryDrop()

◆ QueryInterface()

◆ Release()

Member Data Documentation

◆ m_bAllowDrop

◆ m_cRefCount

◆ m_formatetc

◆ m_hTargetWnd

◆ m_pDropTargetHelper

◆ m_pSupportedFrmt