Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 259 insertions, 0 deletions

diff --git a/vcl/qt5/QtClipboard.cxx b/vcl/qt5/QtClipboard.cxx
new file mode 100644
index 000000000..5d1a167a9
--- /dev/null
+++ b/vcl/qt5/QtClipboard.cxx
@@ -0,0 +1,259 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#include <QtClipboard.hxx>
+#include <QtClipboard.moc>
+
+#include <cppuhelper/supportsservice.hxx>
+#include <sal/log.hxx>
+
+#include <QtWidgets/QApplication>
+
+#include <QtInstance.hxx>
+#include <QtTransferable.hxx>
+#include <QtTools.hxx>
+
+#include <cassert>
+#include <map>
+
+QtClipboard::QtClipboard(const OUString& aModeString, const QClipboard::Mode aMode)
+    : cppu::WeakComponentImplHelper<css::datatransfer::clipboard::XSystemClipboard,
+                                    css::datatransfer::clipboard::XFlushableClipboard,
+                                    XServiceInfo>(m_aMutex)
+    , m_aClipboardName(aModeString)
+    , m_aClipboardMode(aMode)
+    , m_bOwnClipboardChange(false)
+    , m_bDoClear(false)
+{
+    assert(isSupported(m_aClipboardMode));
+    // DirectConnection guarantees the changed slot runs in the same thread as the QClipboard
+    connect(QApplication::clipboard(), &QClipboard::changed, this, &QtClipboard::handleChanged,
+            Qt::DirectConnection);
+
+    // explicitly queue an event, so we can eventually ignore it
+    connect(this, &QtClipboard::clearClipboard, this, &QtClipboard::handleClearClipboard,
+            Qt::QueuedConnection);
+}
+
+css::uno::Reference<css::uno::XInterface> QtClipboard::create(const OUString& aModeString)
+{
+    static const std::map<OUString, QClipboard::Mode> aNameToClipboardMap
+        = { { "CLIPBOARD", QClipboard::Clipboard }, { "PRIMARY", QClipboard::Selection } };
+
+    assert(QApplication::clipboard()->thread() == qApp->thread());
+
+    auto iter = aNameToClipboardMap.find(aModeString);
+    if (iter != aNameToClipboardMap.end() && isSupported(iter->second))
+        return static_cast<cppu::OWeakObject*>(new QtClipboard(aModeString, iter->second));
+    SAL_WARN("vcl.qt", "Ignoring unrecognized clipboard type: '" << aModeString << "'");
+    return css::uno::Reference<css::uno::XInterface>();
+}
+
+void QtClipboard::flushClipboard()
+{
+    auto* pSalInst(GetQtInstance());
+    SolarMutexGuard g;
+    pSalInst->RunInMainThread([this]() {
+        if (!isOwner(m_aClipboardMode))
+            return;
+
+        QClipboard* pClipboard = QApplication::clipboard();
+        const QtMimeData* pQtMimeData
+            = dynamic_cast<const QtMimeData*>(pClipboard->mimeData(m_aClipboardMode));
+        assert(pQtMimeData);
+
+        QMimeData* pMimeCopy = nullptr;
+        if (pQtMimeData && pQtMimeData->deepCopy(&pMimeCopy))
+        {
+            m_bOwnClipboardChange = true;
+            pClipboard->setMimeData(pMimeCopy, m_aClipboardMode);
+            m_bOwnClipboardChange = false;
+        }
+    });
+}
+
+css::uno::Reference<css::datatransfer::XTransferable> QtClipboard::getContents()
+{
+#if defined(EMSCRIPTEN)
+    static QMimeData aMimeData;
+#endif
+    osl::MutexGuard aGuard(m_aMutex);
+
+    // if we're the owner, we might have the XTransferable from setContents. but
+    // maybe a non-LO clipboard change from within LO, like some C'n'P in the
+    // QFileDialog, might have invalidated m_aContents, so we need to check it too.
+    if (isOwner(m_aClipboardMode) && m_aContents.is())
+        return m_aContents;
+
+    // check if we can still use the shared QtClipboardTransferable
+    const QMimeData* pMimeData = QApplication::clipboard()->mimeData(m_aClipboardMode);
+#if defined(EMSCRIPTEN)
+    if (!pMimeData)
+        pMimeData = &aMimeData;
+#endif
+    if (m_aContents.is())
+    {
+        const auto* pTrans = dynamic_cast<QtClipboardTransferable*>(m_aContents.get());
+        assert(pTrans);
+        if (pTrans && pTrans->mimeData() == pMimeData)
+            return m_aContents;
+    }
+
+    m_aContents = new QtClipboardTransferable(m_aClipboardMode, pMimeData);
+    return m_aContents;
+}
+
+void QtClipboard::handleClearClipboard()
+{
+    if (!m_bDoClear)
+        return;
+    QApplication::clipboard()->clear(m_aClipboardMode);
+}
+
+void QtClipboard::setContents(
+    const css::uno::Reference<css::datatransfer::XTransferable>& xTrans,
+    const css::uno::Reference<css::datatransfer::clipboard::XClipboardOwner>& xClipboardOwner)
+{
+    // it's actually possible to get a non-empty xTrans and an empty xClipboardOwner!
+    osl::ClearableMutexGuard aGuard(m_aMutex);
+
+    css::uno::Reference<css::datatransfer::clipboard::XClipboardOwner> xOldOwner(m_aOwner);
+    css::uno::Reference<css::datatransfer::XTransferable> xOldContents(m_aContents);
+    m_aContents = xTrans;
+    m_aOwner = xClipboardOwner;
+
+    m_bDoClear = !m_aContents.is();
+    if (!m_bDoClear)
+    {
+        m_bOwnClipboardChange = true;
+        QApplication::clipboard()->setMimeData(new QtMimeData(m_aContents), m_aClipboardMode);
+        m_bOwnClipboardChange = false;
+    }
+    else
+    {
+        assert(!m_aOwner.is());
+        Q_EMIT clearClipboard();
+    }
+
+    aGuard.clear();
+
+    // we have to notify only an owner change, since handleChanged can't
+    // access the previous owner anymore and can just handle lost ownership.
+    if (xOldOwner.is() && xOldOwner != xClipboardOwner)
+        xOldOwner->lostOwnership(this, xOldContents);
+}
+
+void QtClipboard::handleChanged(QClipboard::Mode aMode)
+{
+    if (aMode != m_aClipboardMode)
+        return;
+
+    osl::ClearableMutexGuard aGuard(m_aMutex);
+
+    // QtWayland will send a second change notification (seemingly without any
+    // trigger). And any C'n'P operation in the Qt file picker emits a signal,
+    // with LO still holding the clipboard ownership, but internally having lost
+    // it. So ignore any signal, which still delivers the internal QtMimeData
+    // as the clipboard content and is no "advertised" change.
+    if (!m_bOwnClipboardChange && isOwner(aMode)
+        && dynamic_cast<const QtMimeData*>(QApplication::clipboard()->mimeData(aMode)))
+        return;
+
+    css::uno::Reference<css::datatransfer::clipboard::XClipboardOwner> xOldOwner(m_aOwner);
+    css::uno::Reference<css::datatransfer::XTransferable> xOldContents(m_aContents);
+    // ownership change from LO POV is handled in setContents
+    if (!m_bOwnClipboardChange)
+    {
+        m_aContents.clear();
+        m_aOwner.clear();
+    }
+
+    std::vector<css::uno::Reference<css::datatransfer::clipboard::XClipboardListener>> aListeners(
+        m_aListeners);
+    css::datatransfer::clipboard::ClipboardEvent aEv;
+    aEv.Contents = getContents();
+
+    aGuard.clear();
+
+    if (!m_bOwnClipboardChange && xOldOwner.is())
+        xOldOwner->lostOwnership(this, xOldContents);
+    for (auto const& listener : aListeners)
+        listener->changedContents(aEv);
+}
+
+OUString QtClipboard::getImplementationName() { return "com.sun.star.datatransfer.QtClipboard"; }
+
+css::uno::Sequence<OUString> QtClipboard::getSupportedServiceNames()
+{
+    return { "com.sun.star.datatransfer.clipboard.SystemClipboard" };
+}
+
+sal_Bool QtClipboard::supportsService(const OUString& ServiceName)
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+OUString QtClipboard::getName() { return m_aClipboardName; }
+
+sal_Int8 QtClipboard::getRenderingCapabilities() { return 0; }
+
+void QtClipboard::addClipboardListener(
+    const css::uno::Reference<css::datatransfer::clipboard::XClipboardListener>& listener)
+{
+    osl::MutexGuard aGuard(m_aMutex);
+    m_aListeners.push_back(listener);
+}
+
+void QtClipboard::removeClipboardListener(
+    const css::uno::Reference<css::datatransfer::clipboard::XClipboardListener>& listener)
+{
+    osl::MutexGuard aGuard(m_aMutex);
+    m_aListeners.erase(std::remove(m_aListeners.begin(), m_aListeners.end(), listener),
+                       m_aListeners.end());
+}
+
+bool QtClipboard::isSupported(const QClipboard::Mode aMode)
+{
+    const QClipboard* pClipboard = QApplication::clipboard();
+    switch (aMode)
+    {
+        case QClipboard::Selection:
+            return pClipboard->supportsSelection();
+
+        case QClipboard::FindBuffer:
+            return pClipboard->supportsFindBuffer();
+
+        case QClipboard::Clipboard:
+            return true;
+    }
+    return false;
+}
+
+bool QtClipboard::isOwner(const QClipboard::Mode aMode)
+{
+    if (!isSupported(aMode))
+        return false;
+
+    const QClipboard* pClipboard = QApplication::clipboard();
+    switch (aMode)
+    {
+        case QClipboard::Selection:
+            return pClipboard->ownsSelection();
+
+        case QClipboard::FindBuffer:
+            return pClipboard->ownsFindBuffer();
+
+        case QClipboard::Clipboard:
+            return pClipboard->ownsClipboard();
+    }
+    return false;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */