vcl/win/dtrans/XNotifyingDataObject.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <osl/diagnose.h>
  21 #include <comphelper/diagnose_ex.hxx>
  22 #include "XNotifyingDataObject.hxx"
  23 #include "WinClipboard.hxx"
  24
  25 using namespace com::sun::star::datatransfer;
  26 using namespace com::sun::star::datatransfer::clipboard;
  27 using com::sun::star::uno::RuntimeException;
  28 using com::sun::star::uno::Reference;
  29
  30 CXNotifyingDataObject::CXNotifyingDataObject(
  31     const IDataObjectPtr& aIDataObject,
  32     const Reference< XTransferable >& aXTransferable,
  33     const Reference< XClipboardOwner >& aXClipOwner,
  34     CWinClipboard* const theWinClipoard) :
  35     m_nRefCnt( 0 ),
  36     m_aIDataObject( aIDataObject ),
  37     m_XTransferable( aXTransferable ),
  38     m_XClipboardOwner( aXClipOwner ),
  39     m_pWinClipImpl( theWinClipoard )
  40 {
  41 }
  42
  43 CXNotifyingDataObject::~CXNotifyingDataObject()
  44 {
  45     if (auto pWinClipImpl = m_pWinClipImpl.get())
  46         pWinClipImpl->onReleaseDataObject(*this);
  47 }
  48
  49 STDMETHODIMP CXNotifyingDataObject::QueryInterface( REFIID iid, void** ppvObject )
  50 {
  51     if ( nullptr == ppvObject )
  52         return E_INVALIDARG;
  53
  54     HRESULT hr = E_NOINTERFACE;
  55
  56     *ppvObject = nullptr;
  57     if ( ( __uuidof( IUnknown ) == iid ) ||
  58          ( __uuidof( IDataObject ) == iid ) )
  59     {
  60         *ppvObject = static_cast< IUnknown* >( this );
  61         static_cast<LPUNKNOWN>(*ppvObject)->AddRef( );
  62         hr = S_OK;
  63     }
  64
  65     return hr;
  66 }
  67
  68 STDMETHODIMP_(ULONG) CXNotifyingDataObject::AddRef( )
  69 {
  70     return static_cast< ULONG >( InterlockedIncrement( &m_nRefCnt ) );
  71 }
  72
  73 namespace
  74 {
  75 // delete CXNotifyingDataObject is a dedicated thread. It calls CWinClipboard::onReleaseDataObject,
  76 // which may lock solar mutex, and if called in CMtaOleClipboard::run() thread, may deadlock.
  77 unsigned __stdcall releaseAsyncProc(void* p)
  78 {
  79     delete static_cast<CXNotifyingDataObject*>(p);
  80     return 0;
  81 }
  82 }
  83
  84 STDMETHODIMP_(ULONG) CXNotifyingDataObject::Release( )
  85 {
  86     ULONG nRefCnt =
  87         static_cast< ULONG >( InterlockedDecrement( &m_nRefCnt ) );
  88
  89     if ( 0 == nRefCnt )
  90     {
  91         auto handle = _beginthreadex(nullptr, 0, releaseAsyncProc, this, 0, nullptr);
  92         assert(handle);
  93         CloseHandle(reinterpret_cast<HANDLE>(handle));
  94     }
  95
  96     return nRefCnt;
  97 }
  98
  99 STDMETHODIMP CXNotifyingDataObject::GetData( FORMATETC * pFormatetc, STGMEDIUM * pmedium )
 100 {
 101     return m_aIDataObject->GetData(pFormatetc, pmedium);
 102 }
 103
 104 STDMETHODIMP CXNotifyingDataObject::EnumFormatEtc(
 105     DWORD dwDirection, IEnumFORMATETC** ppenumFormatetc )
 106 {
 107     return m_aIDataObject->EnumFormatEtc(dwDirection, ppenumFormatetc);
 108 }
 109
 110 STDMETHODIMP CXNotifyingDataObject::QueryGetData( FORMATETC * pFormatetc )
 111 {
 112     return m_aIDataObject->QueryGetData(pFormatetc);
 113 }
 114
 115 STDMETHODIMP CXNotifyingDataObject::GetDataHere( FORMATETC * lpFetc, STGMEDIUM * lpStgMedium )
 116 {
 117     return m_aIDataObject->GetDataHere(lpFetc, lpStgMedium);
 118 }
 119
 120 STDMETHODIMP CXNotifyingDataObject::GetCanonicalFormatEtc( FORMATETC * lpFetc, FORMATETC * lpCanonicalFetc )
 121 {
 122     return m_aIDataObject->GetCanonicalFormatEtc(lpFetc, lpCanonicalFetc);
 123 }
 124
 125 STDMETHODIMP CXNotifyingDataObject::SetData( FORMATETC * lpFetc, STGMEDIUM * lpStgMedium, BOOL bRelease )
 126 {
 127     return m_aIDataObject->SetData( lpFetc, lpStgMedium, bRelease );
 128 }
 129
 130 STDMETHODIMP CXNotifyingDataObject::DAdvise(
 131     FORMATETC * lpFetc, DWORD advf, IAdviseSink * lpAdvSink, DWORD* pdwConnection )
 132 {
 133     return m_aIDataObject->DAdvise( lpFetc, advf, lpAdvSink, pdwConnection );
 134 }
 135
 136 STDMETHODIMP CXNotifyingDataObject::DUnadvise( DWORD dwConnection )
 137 {
 138     return m_aIDataObject->DUnadvise( dwConnection );
 139 }
 140
 141 STDMETHODIMP CXNotifyingDataObject::EnumDAdvise( IEnumSTATDATA ** ppenumAdvise )
 142 {
 143     return m_aIDataObject->EnumDAdvise( ppenumAdvise );
 144 }
 145
 146 CXNotifyingDataObject::operator IDataObject*( )
 147 {
 148     return static_cast< IDataObject* >( this );
 149 }
 150
 151 void CXNotifyingDataObject::lostOwnership( )
 152 {
 153     try
 154     {
 155         if (m_XClipboardOwner.is())
 156             m_XClipboardOwner->lostOwnership(m_pWinClipImpl.get(), m_XTransferable);
 157     }
 158     catch(RuntimeException&)
 159     {
 160         TOOLS_WARN_EXCEPTION( "vcl",  "" );
 161     }
 162 }
 163
 164 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */