qwindowsclipboard.h

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// Copyright (C) 2016 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
 
#ifndef QWINDOWSCLIPBOARD_H
#define QWINDOWSCLIPBOARD_H
 
#include "qwindowsinternalmimedata.h"
 
#include <qpa/qplatformclipboard.h>
 
QT_BEGIN_NAMESPACE
 
class QWindowsOleDataObject;
 
class QWindowsClipboardRetrievalMimeData : public QWindowsInternalMimeData {
public:
 
protected:
    IDataObject *retrieveDataObject() const override;
    void releaseDataObject(IDataObject *) const override;
};
 
class QWindowsClipboard : public QPlatformClipboard
{
    Q_DISABLE_COPY_MOVE(QWindowsClipboard)
public:
    QWindowsClipboard();
    ~QWindowsClipboard() override;
    void registerViewer(); // Call in initialization, when context is up.
    void cleanup();
 
    QMimeData *mimeData(QClipboard::Mode mode = QClipboard::Clipboard) override;
    void setMimeData(QMimeData *data, QClipboard::Mode mode = QClipboard::Clipboard) override;
    bool supportsMode(QClipboard::Mode mode) const override;
    bool ownsMode(QClipboard::Mode mode) const override;
 
    inline bool clipboardViewerWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam, LRESULT *result);
 
    static QWindowsClipboard *instance() { return m_instance; }
 
    HWND clipboardViewer() const { return m_clipboardViewer; }
 
private:
    void clear();
    void releaseIData();
    inline void propagateClipboardMessage(UINT message, WPARAM wParam, LPARAM lParam) const;
    inline void unregisterViewer();
    inline bool ownsClipboard() const;
 
    static QWindowsClipboard *m_instance;
 
    QWindowsClipboardRetrievalMimeData m_retrievalData;
    QWindowsOleDataObject *m_data = nullptr;
    HWND m_clipboardViewer = nullptr;
    HWND m_nextClipboardViewer = nullptr;
    bool m_formatListenerRegistered = false;
};
 
QT_END_NAMESPACE
 
#endif // QWINDOWSCLIPBOARD_H