AListModelObserver.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
//
// Created by alex2772 on 7/7/21.
//
 
#pragma once
 
#include <AUI/Common/AObject.h>
#include "IListModel.h"
 
template<typename T>
class AListModelObserver: public AObject {
public:
   class IListModelListener {
   public:
       virtual void insertItem(size_t at, const T& value) = 0;
       virtual void updateItem(size_t at, const T& value) = 0;
       virtual void removeItem(size_t at) = 0;
 
       virtual void onDataCountChanged() = 0;
       virtual void onDataChanged() = 0;
   };
 
private:
   _<IListModel<T>> mModel;
   IListModelListener* mListener;
 
public:
   explicit AListModelObserver(IListModelListener* listener) : mListener(listener) {
       setSlotsCallsOnlyOnMyThread(true);
   }
 
 
   void setModel(const _<IListModel<T>>& model) {
       if (mModel) {
           mModel->dataInserted.clearAllOutgoingConnectionsWith(this);
           mModel->dataChanged.clearAllOutgoingConnectionsWith(this);
           mModel->dataRemoved.clearAllOutgoingConnectionsWith(this);
       }
       mModel = model;
 
       if (model) {
           for (size_t i = 0; i < model->listSize(); ++i) {
               mListener->insertItem(i, model->listItemAt(i));
           }
           mListener->onDataCountChanged();
           mListener->onDataChanged();
 
           connect(mModel->dataInserted, this, [&](const AListModelRange<T>& data) {
               for (const auto& row : data) {
                   mListener->insertItem(row.getIndex().getRow(), row.get());
               }
               mListener->onDataCountChanged();
               mListener->onDataChanged();
           });
           connect(mModel->dataChanged, this, [&](const AListModelRange<T>& data) {
               for (const auto& row : data) {
                   mListener->updateItem(row.getIndex().getRow(), row.get());
               }
               mListener->onDataChanged();
           });
           connect(mModel->dataRemoved, this, [&](const AListModelRange<T>& data) {
               for (const auto& row : data) {
                   mListener->removeItem(data.begin().getIndex().getRow());
               }
               mListener->onDataCountChanged();
               mListener->onDataChanged();
           });
       }
   }
 
   [[nodiscard]]
   const _<IListModel<T>>& getModel() const {
       return mModel;
   }
};

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