basehashmodel.h

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//#
//# Copyright (C) 2020-2025 QuasarApp.
//# Distributed under the GPLv3 software license, see the accompanying
//# Everyone is permitted to copy and distribute verbatim copies
//# of this license document, but changing it is not allowed.
//#
 
#ifndef BASEHASHMODEL_H
#define BASEHASHMODEL_H
#include <QAbstractItemModel>
#include <QQmlEngine>
 
namespace ViewSolutions {

template<class KEY, class DATA>
class BaseHashModel: public QAbstractListModel
{
 
public:
    BaseHashModel(QObject* parent = nullptr): QAbstractListModel(parent) {
 
    }
 
    int rowCount(const QModelIndex &parent) const override {
        return m_data.size();
    }
 
    QHash<int, QByteArray> roleNames() const override {
        QHash<int, QByteArray> roles;
        roles[Qt::EditRole] = "delegateModel";
        return roles;
    }
 
    QVariant data(const QModelIndex &index, int role) const override {
        if (index.isValid() && role == Qt::EditRole) {
 
            auto iter = std::next(m_data.begin(), index.row());
            if (iter == m_data.end()) {
                return {};
            }
 
            if constexpr  (std::is_same_v<DATA, QVariant>) {
                return *iter;
            } else if constexpr(std::is_base_of_v<QObject, DATA>) {
                QQmlEngine::setObjectOwnership(*iter, QQmlEngine::CppOwnership);
 
                return QVariant::fromValue(*iter);
 
            } else if constexpr (std::is_same_v<DATA, QSharedPointer<QObject>> ||
                                 std::is_base_of_v<QObject, typename DATA::element_type>) {
                QObject* ptr = iter->get();
 
                QQmlEngine::setObjectOwnership(ptr, QQmlEngine::CppOwnership);
                return QVariant::fromValue(ptr);
            } else {
                return QVariant::fromValue(*iter);
 
            }
        }
 
        return {};
    }

    virtual QVariant getByKey(const KEY& key) {
        auto&& val = m_data.value(key);
        if constexpr  (std::is_same_v<DATA, QVariant>) {
            return val;
        } else if constexpr(std::is_base_of_v<QObject, DATA>) {
            QQmlEngine::setObjectOwnership(val, QQmlEngine::CppOwnership);
 
            return QVariant::fromValue(val);
 
        } else if constexpr (std::is_base_of_v<QSharedPointer<QObject>, DATA>) {
            QObject* ptr = val.get();
 
            QQmlEngine::setObjectOwnership(ptr, QQmlEngine::CppOwnership);
            return QVariant::fromValue(ptr);
        } else {
            return QVariant::fromValue(val);
 
        }
 
        return {};
    }
 
    const QHash<KEY, DATA>& dateList() const {
        return m_data;
    }

    virtual void setByKey(const KEY& key, const DATA& data) {
        auto&& iter = m_data.find(key);
        if (iter != m_data.end() ||  *iter != data) {
 
            int insertIdx = std::distance(m_data.begin(), m_data.insert(key, data));
            emit dataChanged(index(insertIdx, 0),
                             index(insertIdx, 0));
        }
    }
 
    virtual void removeByKey(const KEY& key) {
        auto&& iter = m_data.find(key);
        if (iter != m_data.end()) {
 
            int removeIdx = std::distance(m_data.begin(), iter);
            beginRemoveRows(QModelIndex{}, removeIdx, removeIdx);
            m_data.erase(iter);
            endRemoveRows();
        }
    }

    void setDataList(const QHash<KEY, DATA> &newData) {
 
        const int diff = newData.size() - m_data.size();
 
        if (diff > 0) {
            beginInsertRows(QModelIndex{}, m_data.size(), m_data.size() + diff - 1);
            m_data = newData;
            endInsertRows();
 
            emit dataChanged(index(0, 0),
                             index(m_data.size() - diff - 1, 0));
        } else if (diff == 0) {
            m_data = newData;
 
            emit dataChanged(index(0, 0),
                             index(m_data.size() - diff - 1, 0));
        } else {
            beginRemoveRows(QModelIndex{}, m_data.size() + diff, m_data.size() - 1);
            m_data = newData;
 
            endRemoveRows();
 
            emit dataChanged(index(0, 0),
                             index(m_data.size() - 1, 0));
        }
    }
 
private:
    QHash<KEY, DATA> m_data;
 
};
 
 
 
}
 
 
#endif // BASEHASHMODEL_H