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     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the QtGui module of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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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 #include <private/qwidget_p.h>

    55 

    56 QT_BEGIN_NAMESPACE

    57 

    58 #if defined(Q_OS_WINCE)

    59 QT_BEGIN_INCLUDE_NAMESPACE

    60 #include "qguifunctions_wince.h"

    61 QT_END_INCLUDE_NAMESPACE

    62 

    63 HRESULT QtCeGetClipboard(IDataObject** obj);

    64 HRESULT QtCeSetClipboard(IDataObject* obj);

    65 void QtCeFlushClipboard();

    66 

    67 #define OleGetClipboard QtCeGetClipboard

    68 #define OleSetClipboard QtCeSetClipboard

    69 #define OleFlushClipboard QtCeFlushClipboard

    70 

    71 #endif

    72 

    73 

    74 class QClipboardWatcher : public QInternalMimeData {

    75 public:

    76     QClipboardWatcher()

    77         : QInternalMimeData()

    78     {

    79     }

    80 

    81     bool hasFormat_sys(const QString &mimetype) const;

    82     QStringList formats_sys() const;

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

    84 };

    85 

    86 

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

    88 {

    89     IDataObject * pDataObj = 0;

    90 

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

    92         return false;

    93 

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

    95 

    96     pDataObj->Release();

    97 

    98     return has;

    99 }

   100 

   101 QStringList QClipboardWatcher::formats_sys() const

   102 {

   103     QStringList fmts;

   104     IDataObject * pDataObj = 0;

   105 

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

   107         return QStringList();

   108 

   109     fmts = QWindowsMime::allMimesForFormats(pDataObj);

   110 

   111     pDataObj->Release();

   112 

   113     return fmts;

   114 }

   115 

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

   117 {

   118     QVariant result;

   119     IDataObject * pDataObj = 0;

   120 

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

   122         return result;

   123 

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

   125 

   126     if (converter)

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

   128 

   129     pDataObj->Release();

   130 

   131     return result;

   132 }

   133 

   134 class QClipboardData

   135 {

   136 public:

   137     QClipboardData()

   138         : iData(0)

   139         , nextClipboardViewer(0)

   140     {

   141         clipBoardViewer = new QWidget();

   142         clipBoardViewer->createWinId();

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

   144         // We dont need this internal widget to appear in QApplication::topLevelWidgets()

   145         if (QWidgetPrivate::allWidgets)

   146             QWidgetPrivate::allWidgets->remove(clipBoardViewer);

   147     }

   148 

   149     ~QClipboardData()

   150     {

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

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

   153         delete clipBoardViewer;

   154         releaseIData();

   155     }

   156 

   157     void releaseIData()

   158     {

   159         if (iData) {

   160             delete iData->mimeData();

   161             iData->releaseQt();

   162             iData->Release();

   163             iData = 0;

   164         }

   165     }

   166 

   167     QOleDataObject * iData;

   168     QWidget *clipBoardViewer;

   169     HWND nextClipboardViewer;

   170     QClipboardWatcher watcher;

   171 };

   172 

   173 static QClipboardData *ptrClipboardData = 0;

   174 

   175 static QClipboardData *clipboardData()

   176 {

   177     if (ptrClipboardData == 0) {

   178         ptrClipboardData = new QClipboardData;

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

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

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

   182     }

   183     return ptrClipboardData;

   184 }

   185 

   186 static void cleanupClipboardData()

   187 {

   188     delete ptrClipboardData;

   189     ptrClipboardData = 0;

   190 }

   191 

   192 #if defined(Q_OS_WINCE)

   193 HRESULT QtCeGetClipboard(IDataObject** obj)

   194 {

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

   196     if (!OpenClipboard(owner))

   197         return !S_OK;

   198 

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

   200         return !S_OK;

   201 

   202     HANDLE clipData = GetClipboardData(CF_TEXT);

   203     QString clipText;

   204     if (clipData == 0) {

   205         clipData = GetClipboardData(CF_UNICODETEXT);

   206         if (clipData != 0)

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

   208     } else {

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

   210     }

   211 

   212     QMimeData *mimeData = new QMimeData();

   213     mimeData->setText(clipText);

   214     QOleDataObject* data = new QOleDataObject(mimeData);

   215     *obj = data;

   216     CloseClipboard();

   217     return S_OK;

   218 }

   219 

   220 HRESULT QtCeSetClipboard(IDataObject* obj)

   221 {

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

   223     if (!OpenClipboard(owner))

   224         return !S_OK;

   225 

   226     bool result = false;

   227     if (obj == 0) {

   228         result = true;

   229         EmptyClipboard();

   230         CloseClipboard();

   231     } else {

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

   233 

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

   235         if (data->hasText()) {

   236             EmptyClipboard();

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

   238             CloseClipboard();

   239             result = true;

   240         }

   241     }

   242     return result ? S_OK : !S_OK;

   243 }

   244 

   245 void QtCeFlushClipboard() { }

   246 #endif

   247 

   248 

   249 

   250 QClipboard::~QClipboard()

   251 {

   252     cleanupClipboardData();

   253 }

   254 

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

   256 {

   257     if (mode != Clipboard)

   258         return;

   259     QClipboardData *d = clipboardData();

   260 

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

   262         d->releaseIData();

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

   264     }

   265 

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

   267         d->releaseIData();

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

   269         return;

   270     }

   271 #if defined(Q_OS_WINCE)

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

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

   274     emit dataChanged();

   275     emit changed(Clipboard);

   276 #endif

   277 }

   278 

   279 void QClipboard::clear(Mode mode)

   280 {

   281     if (mode != Clipboard) return;

   282 

   283     QClipboardData *d = clipboardData();

   284 

   285     d->releaseIData();

   286 

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

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

   289         return;

   290     }

   291 #if defined(Q_OS_WINCE)

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

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

   294     emit dataChanged();

   295     emit changed(Clipboard);

   296 #endif

   297 }

   298 

   299 bool QClipboard::event(QEvent *e)

   300 {

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

   302         return QObject::event(e);

   303 

   304     QClipboardData *d = clipboardData();

   305 

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

   307     if (!m) {

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

   309         if (ownsClipboard()) {

   310             OleFlushClipboard();

   311             d->releaseIData();

   312         }

   313         return true;

   314     }

   315 

   316     bool propagate = false;

   317 

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

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

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

   321         else

   322             propagate = true;

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

   324         emitChanged(QClipboard::Clipboard);

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

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

   327             d->releaseIData();

   328         propagate = true;

   329     }

   330 

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

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

   333     }

   334 

   335     return true;

   336 }

   337 

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

   339 {

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

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

   342         // is not emitted while being connected to.

   343         bool blocked = blockSignals(true);

   344         QClipboardData *d = clipboardData();

   345         blockSignals(blocked);

   346         Q_UNUSED(d);

   347     }

   348 }

   349 

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

   351 {

   352     if (mode != Clipboard)

   353         return 0;

   354 

   355     QClipboardData *data = clipboardData();

   356     // sort cut for local copy / paste

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

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

   359     return &data->watcher;

   360 }

   361 

   362 bool QClipboard::supportsMode(Mode mode) const

   363 {

   364     return (mode == Clipboard);

   365 }

   366 

   367 bool QClipboard::ownsMode(Mode mode) const

   368 {

   369     if (mode == Clipboard) {

   370         QClipboardData *d = clipboardData();

   371 #if !defined(Q_OS_WINCE)

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

   373 #else

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

   375 #endif

   376     } else {

   377         return false;

   378     }

   379 }

   380 

   381 void QClipboard::ownerDestroyed()

   382 {

   383 }

   384 

   385 QT_END_NAMESPACE

   386 

   387 #endif // QT_NO_CLIPBOARD