ATextArea.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2024 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 5/22/2021.
//
 
 
#pragma once
 
 
#include "AViewContainer.h"
#include "AAbstractTextField.h"
#include "AScrollbar.h"
#include "ATextBase.h"
 
class API_AUI_VIEWS AScrollArea;

class API_AUI_VIEWS ATextArea: public AAbstractTypeableView<ATextBase<AWordWrappingEngine<std::list<_unique<aui::detail::TextBaseEntry>>>>>, public IStringable {
public:
    friend class UITextArea; // for testing
 
    using Iterator = Entries::iterator;
 
    ATextArea();
    ATextArea(const AString& text);
    ~ATextArea() override;
 
    bool capturesFocus() override;
 
    AString toString() const override;
    const AString& getText() const override;
    unsigned int cursorIndexByPos(glm::ivec2 pos) override;
    glm::ivec2 getPosByIndex(size_t index) override;
    void setText(const AString& t) override;
    void render(ARenderContext context) override;
    void onCharEntered(char16_t c) override;
    glm::ivec2 getCursorPosition() override;
    void setSize(glm::ivec2 size) override;
 
    bool isPasswordField() const noexcept override;
 
    ATextInputType textInputType() const noexcept override;
 
protected:
    void typeableErase(size_t begin, size_t end) override;
    bool typeableInsert(size_t at, const AString& toInsert) override;
    bool typeableInsert(size_t at, char16_t toInsert) override;
    size_t typeableFind(char16_t c, size_t startPos) override;
    size_t typeableReverseFind(char16_t c, size_t startPos) override;
    size_t length() const override;
    void fillStringCanvas(const _<IRenderer::IMultiStringCanvas>& canvas) override;
 
private:
    mutable AOptional<AString> mCompiledText;
    glm::ivec2 mCursorPosition{0, 0};
 
    struct EntityQueryResult {
        Iterator iterator;
        size_t relativeIndex;
    };
 
private:
 
    auto& entities() {
        return mEngine.entries();
    }
 
    auto& entities() const {
        return mEngine.entries();
    }
 
    void onCursorIndexChanged() override;
 
    EntityQueryResult getLeftEntity(size_t indexRelativeToFrom, EntityQueryResult from);
    EntityQueryResult getLeftEntity(size_t index);
    Iterator splitIfNecessary(EntityQueryResult at);
 
    AScrollArea* findScrollArea();
};