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// 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
#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 QQmlPreviewUrlInterceptor;
class QQuickWindow;
class QQmlPreviewHandler : public QObject
{
Q_OBJECT
public:
explicit QQmlPreviewHandler(QObject *parent = nullptr);
~QQmlPreviewHandler();
QQuickItem *currentRootItem();
void addEngine(QQmlEngine *engine);
void removeEngine(QQmlEngine *engine);
void loadUrl(const QUrl &url);
void rerun();
void zoom(qreal newFactor);
void clear();
struct FpsInfo {
quint16 numSyncs;
quint16 minSync;
quint16 maxSync;
quint16 totalSync;
quint16 numRenders;
quint16 minRender;
quint16 maxRender;
quint16 totalRender;
};
Q_SIGNALS:
void error(const QString &message);
void fps(const FpsInfo &info);
protected:
bool eventFilter(QObject *obj, QEvent *event) override;
private:
void doZoom();
void tryCreateObject();
void showObject(QObject *object);
void setCurrentWindow(QQuickWindow *window);
void beforeSynchronizing();
void afterSynchronizing();
void beforeRendering();
void frameSwapped();
void fpsTimerHit();
QScopedPointer<QQuickItem> m_dummyItem;
QList<QQmlEngine *> m_engines;
QPointer<QQuickItem> m_currentRootItem;
QVector<QPointer<QObject>> m_createdObjects;
QScopedPointer<QQmlComponent> m_component;
QPointer<QQuickWindow> m_currentWindow;
qreal m_zoomFactor = 1.0;
bool m_supportsMultipleWindows;
QQmlPreviewPosition m_lastPosition;
QTimer m_fpsTimer;
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;
};
FrameTime m_rendering;
FrameTime m_synchronizing;
};
QT_END_NAMESPACE
Q_DECLARE_METATYPE(QQmlPreviewHandler::FpsInfo)
#endif // QQMLPREVIEWHANDLER_H
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