qwindowsdropdataobject.cpp

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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qwindowsdropdataobject.h"
 
#include <QtCore/qurl.h>
#include <QtCore/qmimedata.h>
#include "qwindowsmimeregistry.h"
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
/*!
    \class QWindowsDropDataObject
    \brief QWindowsOleDataObject subclass specialized for handling Drag&Drop.
 
    Prevents "text/uri-list" data for local files from being exported as text
    or URLs, to allow dropped files to be attached to Office applications
    (instead of creating local hyperlinks).
 
    \internal
*/
 
QWindowsDropDataObject::QWindowsDropDataObject(QMimeData *mimeData) :
    QWindowsOleDataObject(mimeData)
{
}
 
QWindowsDropDataObject::~QWindowsDropDataObject() = default;
 
STDMETHODIMP
QWindowsDropDataObject::GetData(LPFORMATETC pformatetc, LPSTGMEDIUM pmedium) noexcept
{
    if (shouldIgnore(pformatetc))
        return ResultFromScode(DATA_E_FORMATETC);
 
    return QWindowsOleDataObject::GetData(pformatetc, pmedium);
}
 
STDMETHODIMP
QWindowsDropDataObject::QueryGetData(LPFORMATETC pformatetc) noexcept
{
    if (shouldIgnore(pformatetc))
        return ResultFromScode(DATA_E_FORMATETC);
 
    return QWindowsOleDataObject::QueryGetData(pformatetc);
}
 
// If the data is "text/uri-list" only, and all URIs are for local files,
// we prevent it from being exported as text or URLs, to make target applications
// like MS Office attach or open the files instead of creating local hyperlinks.
bool QWindowsDropDataObject::shouldIgnore(LPFORMATETC pformatetc) const
{
    QMimeData *dropData = mimeData();
 
    if (dropData && dropData->formats().size() == 1 && dropData->hasUrls()) {
        QString formatName = QWindowsMimeRegistry::clipboardFormatName(pformatetc->cfFormat);
        if (pformatetc->cfFormat == CF_UNICODETEXT
                || pformatetc->cfFormat == CF_TEXT
                || formatName == "UniformResourceLocator"_L1
                || formatName == "UniformResourceLocatorW"_L1) {
            const auto urls = dropData->urls();
            return std::all_of(urls.cbegin(), urls.cend(), [] (const QUrl &u) { return u.isLocalFile(); });
        }
    }
 
    return false;
}
 
QT_END_NAMESPACE