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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#pragma once
#include <qmldesignercorelib_global.h>
#include <model.h>
#include <utils/optional.h>
#include <QHash>
#include <QQueue>
namespace QmlDesigner {
template<class DataType>
class ModelCache
{
public:
ModelCache(int max = 20)
: m_maxEntries(max)
{}
void insert(Model *model, const DataType &data)
{
QObject::connect(model, &Model::destroyed, [this](QObject *o) {
QObject *deletedModel = o;
if (deletedModel) {
m_content.remove(deletedModel);
m_queue.removeAll(deletedModel);
}
});
m_content.insert(model, data);
if (!m_queue.contains(model))
m_queue.append(model);
if (m_queue.length() > m_maxEntries) {
QObject *first = m_queue.takeFirst();
m_content.remove(first);
}
}
Utils::optional<DataType> take(Model *model)
{
if (!m_content.contains(model))
return {};
m_queue.removeOne(model);
return m_content.take(model);
}
private:
QHash<QObject *, DataType> m_content;
QQueue<QObject *> m_queue;
int m_maxEntries = 20;
};
} // namespace QmlDesigner
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