qqmlcontext_p.h

Go to the documentation of this file.

// 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 QQMLCONTEXT_P_H
#define QQMLCONTEXT_P_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 <QtCore/qlist.h>
#include <QtCore/qstring.h>
#include <QtCore/qvariant.h>
#include <QtCore/qpointer.h>
#include <QtQml/qqmlcontext.h>
#include <QtQml/qqmllist.h>
 
#include <QtCore/private/qobject_p.h>
#include <QtCore/qtaggedpointer.h>
#include <QtQml/private/qqmlrefcount_p.h>
 
QT_BEGIN_NAMESPACE
 
class QQmlContextData;
 
class QQmlContextPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QQmlContext)
public:
    static QQmlContextPrivate *get(QQmlContext *context) {
        return static_cast<QQmlContextPrivate *>(QObjectPrivate::get(context));
    }
 
    static QQmlContext *get(QQmlContextPrivate *context) {
        return static_cast<QQmlContext *>(context->q_func());
    }
 
    static qsizetype context_count(QQmlListProperty<QObject> *);
    static QObject *context_at(QQmlListProperty<QObject> *, qsizetype);
 
    void dropDestroyedQObject(const QString &name, QObject *destroyed);
 
    int notifyIndex() const { return m_notifyIndex; }
    void setNotifyIndex(int notifyIndex) { m_notifyIndex = notifyIndex; }
 
    int numPropertyValues() const {
        auto size = m_propertyValues.size();
        Q_ASSERT(size <= std::numeric_limits<int>::max());
        return int(size);
    }
    void appendPropertyValue(const QVariant &value) { m_propertyValues.append(value); }
    void setPropertyValue(int index, const QVariant &value) { m_propertyValues[index] = value; }
    QVariant propertyValue(int index) const { return m_propertyValues[index]; }
 
    QList<QPointer<QObject>> instances() const { return m_instances; }
    void appendInstance(QObject *instance) { m_instances.append(instance); }
    void cleanInstances()
    {
        for (auto it = m_instances.begin(); it != m_instances.end();
             it->isNull() ? (it = m_instances.erase(it)) : ++it) {}
    }
 
    void emitDestruction();
 
private:
    friend class QQmlContextData;
 
    QQmlContextPrivate(QQmlContextData *data) : m_data(data) {}
    QQmlContextPrivate(QQmlContext *publicContext, const QQmlRefPointer<QQmlContextData> &parent,
                       QQmlEngine *engine = nullptr);
 
    // Intentionally a bare pointer. QQmlContextData knows whether it owns QQmlContext or vice
    // versa. If QQmlContext is the owner, QQmlContextData keeps an extra ref for its publicContext.
    // The publicContext ref is released when doing QQmlContextData::setPublicContext(nullptr).
    QQmlContextData *m_data;
 
    QList<QVariant> m_propertyValues;
    int m_notifyIndex = -1;
 
    // Only used for debugging
    QList<QPointer<QObject>> m_instances;
};
 
QT_END_NAMESPACE
 
#endif // QQMLCONTEXT_P_H