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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#pragma once
#include "aggregation_global.h"
#include <QObject>
#include <QList>
#include <QHash>
#include <QReadWriteLock>
#include <QReadLocker>
namespace Aggregation {
class AGGREGATION_EXPORT Aggregate : public QObject
{
Q_OBJECT
public:
Aggregate(QObject *parent = nullptr);
~Aggregate() override;
void add(QObject *component);
void remove(QObject *component);
template <typename T> T *component() {
QReadLocker locker(&lock());
for (QObject *component : std::as_const(m_components)) {
if (T *result = qobject_cast<T *>(component))
return result;
}
return nullptr;
}
template <typename T> QList<T *> components() {
QReadLocker locker(&lock());
QList<T *> results;
for (QObject *component : std::as_const(m_components)) {
if (T *result = qobject_cast<T *>(component)) {
results << result;
}
}
return results;
}
static Aggregate *parentAggregate(QObject *obj);
static QReadWriteLock &lock();
signals:
void changed();
private:
void deleteSelf(QObject *obj);
static QHash<QObject *, Aggregate *> &aggregateMap();
QList<QObject *> m_components;
};
// get a component via global template function
template <typename T> T *query(Aggregate *obj)
{
if (!obj)
return nullptr;
return obj->template component<T>();
}
template <typename T> T *query(QObject *obj)
{
if (!obj)
return nullptr;
T *result = qobject_cast<T *>(obj);
if (!result) {
QReadLocker locker(&Aggregate::lock());
Aggregate *parentAggregation = Aggregate::parentAggregate(obj);
result = (parentAggregation ? query<T>(parentAggregation) : nullptr);
}
return result;
}
// get all components of a specific type via template function
template <typename T> QList<T *> query_all(Aggregate *obj)
{
if (!obj)
return QList<T *>();
return obj->template components<T>();
}
template <typename T> QList<T *> query_all(QObject *obj)
{
if (!obj)
return QList<T *>();
QReadLocker locker(&Aggregate::lock());
Aggregate *parentAggregation = Aggregate::parentAggregate(obj);
QList<T *> results;
if (parentAggregation)
results = query_all<T>(parentAggregation);
else if (T *result = qobject_cast<T *>(obj))
results.append(result);
return results;
}
} // namespace Aggregation
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