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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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    16 ** GNU Lesser General Public License Usage

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include "qclipboard.h"

    43 

    44 #ifndef QT_NO_CLIPBOARD

    45 

    46 #include "qapplication.h"

    47 #include "qapplication_p.h"

    48 #include "qeventloop.h"

    49 #include "qwidget.h"

    50 #include "qevent.h"

    51 #include "qmime.h"

    52 #include "qt_windows.h"

    53 #include "qdnd_p.h"

    54 

    55 QT_BEGIN_NAMESPACE

    56 

    57 #if defined(Q_OS_WINCE)

    58 QT_BEGIN_INCLUDE_NAMESPACE

    59 #include "qguifunctions_wince.h"

    60 QT_END_INCLUDE_NAMESPACE

    61 

    62 HRESULT QtCeGetClipboard(IDataObject** obj);

    63 HRESULT QtCeSetClipboard(IDataObject* obj);

    64 void QtCeFlushClipboard();

    65 

    66 #define OleGetClipboard QtCeGetClipboard

    67 #define OleSetClipboard QtCeSetClipboard

    68 #define OleFlushClipboard QtCeFlushClipboard

    69 

    70 #endif

    71 

    72 

    73 class QClipboardWatcher : public QInternalMimeData {

    74 public:

    75     QClipboardWatcher()

    76         : QInternalMimeData()

    77     {

    78     }

    79 

    80     bool hasFormat_sys(const QString &mimetype) const;

    81     QStringList formats_sys() const;

    82     QVariant retrieveData_sys(const QString &mimetype, QVariant::Type preferredType) const;

    83 };

    84 

    85 

    86 bool QClipboardWatcher::hasFormat_sys(const QString &mime) const

    87 {

    88     IDataObject * pDataObj = 0;

    89 

    90     if (OleGetClipboard(&pDataObj) != S_OK && !pDataObj) // Sanity

    91         return false;

    92 

    93     bool has = QWindowsMime::converterToMime(mime, pDataObj) != 0;

    94 

    95     pDataObj->Release();

    96 

    97     return has;

    98 }

    99 

   100 QStringList QClipboardWatcher::formats_sys() const

   101 {

   102     QStringList fmts;

   103     IDataObject * pDataObj = 0;

   104 

   105     if (OleGetClipboard(&pDataObj) != S_OK && !pDataObj) // Sanity

   106         return QStringList();

   107 

   108     fmts = QWindowsMime::allMimesForFormats(pDataObj);

   109 

   110     pDataObj->Release();

   111 

   112     return fmts;

   113 }

   114 

   115 QVariant QClipboardWatcher::retrieveData_sys(const QString &mimeType, QVariant::Type type) const

   116 {

   117     QVariant result;

   118     IDataObject * pDataObj = 0;

   119 

   120     if (OleGetClipboard(&pDataObj) != S_OK && !pDataObj) // Sanity

   121         return result;

   122 

   123     QWindowsMime *converter = QWindowsMime::converterToMime(mimeType, pDataObj);

   124 

   125     if (converter)

   126         result = converter->convertToMime(mimeType, pDataObj, type);

   127 

   128     pDataObj->Release();

   129 

   130     return result;

   131 }

   132 

   133 class QClipboardData

   134 {

   135 public:

   136     QClipboardData()

   137         : iData(0)

   138         , nextClipboardViewer(0)

   139     {

   140         clipBoardViewer = new QWidget();

   141         clipBoardViewer->createWinId();

   142         clipBoardViewer->setObjectName(QLatin1String("internal clipboard owner"));

   143     }

   144 

   145     ~QClipboardData()

   146     {

   147         Q_ASSERT(clipBoardViewer->testAttribute(Qt::WA_WState_Created));

   148         ChangeClipboardChain(clipBoardViewer->internalWinId(), nextClipboardViewer);

   149         delete clipBoardViewer;

   150         releaseIData();

   151     }

   152 

   153     void releaseIData()

   154     {

   155         if (iData) {

   156             delete iData->mimeData();

   157             iData->releaseQt();

   158             iData->Release();

   159             iData = 0;

   160         }

   161     }

   162 

   163     QOleDataObject * iData;

   164     QWidget *clipBoardViewer;

   165     HWND nextClipboardViewer;

   166     QClipboardWatcher watcher;

   167 };

   168 

   169 static QClipboardData *ptrClipboardData = 0;

   170 

   171 static QClipboardData *clipboardData()

   172 {

   173     if (ptrClipboardData == 0) {

   174         ptrClipboardData = new QClipboardData;

   175         // this needs to be done here to avoid recursion

   176         Q_ASSERT(ptrClipboardData->clipBoardViewer->testAttribute(Qt::WA_WState_Created));

   177         ptrClipboardData->nextClipboardViewer = SetClipboardViewer(ptrClipboardData->clipBoardViewer->internalWinId());

   178     }

   179     return ptrClipboardData;

   180 }

   181 

   182 static void cleanupClipboardData()

   183 {

   184     delete ptrClipboardData;

   185     ptrClipboardData = 0;

   186 }

   187 

   188 #if defined(Q_OS_WINCE)

   189 HRESULT QtCeGetClipboard(IDataObject** obj)

   190 {

   191     HWND owner = ptrClipboardData->clipBoardViewer->internalWinId();

   192     if (!OpenClipboard(owner))

   193         return !S_OK;

   194 

   195     if (!IsClipboardFormatAvailable(CF_TEXT) && !IsClipboardFormatAvailable(CF_UNICODETEXT))

   196         return !S_OK;

   197 

   198     HANDLE clipData = GetClipboardData(CF_TEXT);

   199     QString clipText;

   200     if (clipData == 0) {

   201         clipData = GetClipboardData(CF_UNICODETEXT);

   202         if (clipData != 0)

   203             clipText = QString::fromWCharArray((wchar_t *)clipData);

   204     } else {

   205         clipText = QString::fromLatin1((const char*)clipData);

   206     }

   207 

   208     QMimeData *mimeData = new QMimeData();

   209     mimeData->setText(clipText);

   210     QOleDataObject* data = new QOleDataObject(mimeData);

   211     *obj = data;

   212     CloseClipboard();

   213     return S_OK;

   214 }

   215 

   216 HRESULT QtCeSetClipboard(IDataObject* obj)

   217 {

   218     HWND owner = ptrClipboardData->clipBoardViewer->internalWinId();

   219     if (!OpenClipboard(owner))

   220         return !S_OK;

   221 

   222     bool result = false;

   223     if (obj == 0) {

   224         result = true;

   225         EmptyClipboard();

   226         CloseClipboard();

   227     } else {

   228         QOleDataObject* qobj = static_cast<QOleDataObject*>(obj);

   229 

   230         const QMimeData* data = qobj->mimeData();

   231         if (data->hasText()) {

   232             EmptyClipboard();

   233             result = SetClipboardData(CF_UNICODETEXT, wcsdup(reinterpret_cast<const wchar_t *> (data->text().utf16()))) != NULL;

   234             CloseClipboard();

   235             result = true;

   236         }

   237     }

   238     return result ? S_OK : !S_OK;

   239 }

   240 

   241 void QtCeFlushClipboard() { }

   242 #endif

   243 

   244 

   245 

   246 QClipboard::~QClipboard()

   247 {

   248     cleanupClipboardData();

   249 }

   250 

   251 void QClipboard::setMimeData(QMimeData *src, Mode mode)

   252 {

   253     if (mode != Clipboard)

   254         return;

   255     QClipboardData *d = clipboardData();

   256 

   257     if (!(d->iData && d->iData->mimeData() == src)) {

   258         d->releaseIData();

   259         d->iData = new QOleDataObject(src);

   260     }

   261 

   262     if (OleSetClipboard(d->iData) != S_OK) {

   263         d->releaseIData();

   264         qErrnoWarning("QClipboard::setMimeData: Failed to set data on clipboard");

   265         return;

   266     }

   267 #if defined(Q_OS_WINCE)

   268     // As WinCE does not support notifications we send the signal here

   269     // We will get no event when the clipboard changes outside...

   270     emit dataChanged();

   271     emit changed(Clipboard);

   272 #endif

   273 }

   274 

   275 void QClipboard::clear(Mode mode)

   276 {

   277     if (mode != Clipboard) return;

   278 

   279     QClipboardData *d = clipboardData();

   280 

   281     d->releaseIData();

   282 

   283     if (OleSetClipboard(0) != S_OK) {

   284         qErrnoWarning("QClipboard::clear: Failed to clear data on clipboard");

   285         return;

   286     }

   287 #if defined(Q_OS_WINCE)

   288     // As WinCE does not support notifications we send the signal here

   289     // We will get no event when the clipboard changes outside...

   290     emit dataChanged();

   291     emit changed(Clipboard);

   292 #endif

   293 }

   294 

   295 bool QClipboard::event(QEvent *e)

   296 {

   297     if (e->type() != QEvent::Clipboard)

   298         return QObject::event(e);

   299 

   300     QClipboardData *d = clipboardData();

   301 

   302     MSG *m = (MSG *)((QClipboardEvent*)e)->data();

   303     if (!m) {

   304         // this is sent to render all formats at app shut down

   305         if (ownsClipboard()) {

   306             OleFlushClipboard();

   307             d->releaseIData();

   308         }

   309         return true;

   310     }

   311 

   312     bool propagate = false;

   313 

   314     if (m->message == WM_CHANGECBCHAIN) {

   315         if ((HWND)m->wParam == d->nextClipboardViewer)

   316             d->nextClipboardViewer = (HWND)m->lParam;

   317         else

   318             propagate = true;

   319     } else if (m->message == WM_DRAWCLIPBOARD) {

   320         emitChanged(QClipboard::Clipboard);

   321         if (!ownsClipboard() && d->iData)

   322             // clean up the clipboard object if we no longer own the clipboard

   323             d->releaseIData();

   324         propagate = true;

   325     }

   326 

   327     if (propagate && d->nextClipboardViewer) {

   328         SendMessage(d->nextClipboardViewer, m->message, m->wParam, m->lParam);

   329     }

   330 

   331     return true;

   332 }

   333 

   334 void QClipboard::connectNotify(const char *signal)

   335 {

   336     if (qstrcmp(signal,SIGNAL(dataChanged())) == 0) {

   337         // ensure we are up and running but block signals so the dataChange signal

   338         // is not emitted while being connected to.

   339         bool blocked = blockSignals(true);

   340         QClipboardData *d = clipboardData();

   341         blockSignals(blocked);

   342         Q_UNUSED(d);

   343     }

   344 }

   345 

   346 const QMimeData *QClipboard::mimeData(Mode mode) const

   347 {

   348     if (mode != Clipboard)

   349         return 0;

   350 

   351     QClipboardData *data = clipboardData();

   352     // sort cut for local copy / paste

   353     if (ownsClipboard() && data->iData->mimeData())

   354         return data->iData->mimeData();

   355     return &data->watcher;

   356 }

   357 

   358 bool QClipboard::supportsMode(Mode mode) const

   359 {

   360     return (mode == Clipboard);

   361 }

   362 

   363 bool QClipboard::ownsMode(Mode mode) const

   364 {

   365     if (mode == Clipboard) {

   366         QClipboardData *d = clipboardData();

   367 #if !defined(Q_OS_WINCE)

   368         return d->iData && OleIsCurrentClipboard(d->iData) == S_OK;

   369 #else

   370         return d->iData && GetClipboardOwner() == d->clipBoardViewer->internalWinId();

   371 #endif

   372     } else {

   373         return false;

   374     }

   375 }

   376 

   377 void QClipboard::ownerDestroyed()

   378 {

   379 }

   380 

   381 QT_END_NAMESPACE

   382 

   383 #endif // QT_NO_CLIPBOARD