AListModelSelection.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 alex2 on 04.09.2020.
//
 
#pragma once
 
 
#include "AListModelIndex.h"
#include "AListModelRange.h"
#include <AUI/Common/ASet.h>
#include <AUI/Common/AVector.h>
#include <cassert>
 
template<typename T> class IListModel;
 
template <typename T>
class AListModelSelection {
private:
   ASet<AListModelIndex> mIndices;
   _<IListModel<T>> mModel;
 
public:
   AListModelSelection() = default;
   AListModelSelection(const ASet<AListModelIndex>& indices, _<IListModel<T>> model) : mIndices(indices),
                                                                                   mModel(std::move(model)) {}
 
   class Iterator {
   private:
       ASet<AListModelIndex>::iterator mIterator;
       _<IListModel<T>> mModel;
 
 
   public:
       Iterator(const ASet<AListModelIndex>::iterator& iterator, _<IListModel<T>> model):
           mIterator(iterator), mModel(std::move(model)) {}
 
 
       Iterator& operator*() {
           return *this;
       }
 
       auto& operator->() {
           return mModel->listItemAt(*mIterator);
       }
       auto get() const {
           return mModel->listItemAt(*mIterator);
       }
 
       Iterator& operator++() {
           ++mIterator;
           return *this;
       }
 
       bool operator!=(const Iterator& other) const {
           AUI_ASSERT(mModel == other.mModel);
           return mIterator != other.mIterator;
       }
 
       bool operator==(const Iterator& other) const {
           AUI_ASSERT(mModel == other.mModel);
           return mIterator == other.mIterator;
       }
 
       [[nodiscard]]
       const AListModelIndex& getIndex() const {
           return *mIterator;
       }
   };
 
   AListModelSelection<T>::Iterator begin() const {
       return {mIndices.begin(), mModel};
   }
   AListModelSelection<T>::Iterator end() const {
       return {mIndices.end(), mModel};
   }
 
   [[nodiscard]] size_t size() const {
       return mIndices.size();
   }
   [[nodiscard]] bool empty() const {
       return mIndices.empty();
   }
 
   const _<IListModel<T>>& getModel() const {
       return mModel;
   }
 
   const ASet<AListModelIndex>& getIndices() const {
       return mIndices;
   }
 
   AListModelIndex first() {
       AUI_ASSERTX(mIndices.begin() != mIndices.end(), "selection model is empty");
       return *mIndices.begin();
   }
 
   AVector<AListModelRange<T>> ranges() const noexcept;
};
 
#include "IListModel.h"
 
template<typename T>
AVector<AListModelRange<T>> AListModelSelection<T>::ranges() const noexcept {
   return mModel->rangesIncluding([&](size_t i) {
       return mIndices.contains(i);
   });
}

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