qqmlpreviewhandler.h

Enable keyboard shortcuts

// Copyright (C) 2018 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

// Qt-Security score:significant

#ifndef QQMLPREVIEWHANDLER_H

#define QQMLPREVIEWHANDLER_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include "qqmlpreviewposition.h"

#include <QtCore/qobject.h>

#include <QtCore/qvector.h>

#include <QtCore/qrect.h>

#include <QtCore/qpointer.h>

#include <QtCore/qelapsedtimer.h>

#include <QtQml/qqmlengine.h>

QT_BEGIN_NAMESPACE

class QQmlEngine;

class QQuickItem;

class QQuickWindow;

class QQmlPreviewServiceImpl;

class QQmlPreviewHandler : public QObject

    Q_OBJECT

public:

    struct FpsInfo {

        quint16 numSyncs;

        quint16 minSync;

        quint16 maxSync;

        quint16 totalSync;

        quint16 numRenders;

        quint16 minRender;

        quint16 maxRender;

        quint16 totalRender;

};

    explicit QQmlPreviewHandler(QObject *parent = nullptr);

    ~QQmlPreviewHandler();

    QQuickItem *currentRootItem() const;

    void setCurrentRootItem(QQuickItem *item);

    QQuickWindow *currentWindow() const;

    void setCurrentWindow(QQuickWindow *window);

    virtual void connectToService(QQmlPreviewServiceImpl *service);

    virtual void addEngine(QQmlEngine *engine);

    virtual void removeEngine(QQmlEngine *engine);

    virtual void load(const QUrl &url) = 0;

    void setAnimationSpeed(qreal newFactor);

    QList<QQmlEngine *> engines() const { return m_engines; }

Q_SIGNALS:

    void error(const QString &message);

    void fps(const QQmlPreviewHandler::FpsInfo &info);

protected:

    struct FrameTime {

        void beginFrame();

        void recordFrame();

        void endFrame();

        void reset();

        QElapsedTimer timer;

        qint64 elapsed = -1;

        quint16 min = std::numeric_limits<quint16>::max();

        quint16 max = 0;

        quint16 total = 0;

        quint16 number = 0;

};

    void connectWindow(QQuickWindow *window);

    void disconnectWindow(QQuickWindow *window);

    void zoomWindow(QQuickWindow *window, qreal zoomFactor, QQmlPreviewPosition *position);

private:

    void beforeSynchronizing();

    void afterSynchronizing();

    void beforeRendering();

    void frameSwapped();

    void fpsTimerHit();

    QList<QQmlEngine *> m_engines;

    QPointer<QQuickItem> m_currentRootItem;

    QPointer<QQuickWindow> m_currentWindow;

    QTimer m_fpsTimer;

    FrameTime m_rendering;

    FrameTime m_synchronizing;

};

QT_END_NAMESPACE

Q_DECLARE_METATYPE(QQmlPreviewHandler::FpsInfo)

#endif // QQMLPREVIEWHANDLER_H