widget.hpp

/*
    KTech, Kaup's C++ 2D terminal game engine library.
    Copyright (C) 2023-2025 Ethan Kaufman (AKA Kaup)
 
    This file is part of KTech.
 
    KTech is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    any later version.
 
    KTech is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with KTech. If not, see <https://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#define KTECH_DEFINITION
#include "../ktech.hpp"
#undef KTECH_DEFINITION
#include "../utility/id.hpp"
#include "../basic/point.hpp"
#include "../world/texture.hpp"
#include "../engine/input/input.hpp"
#include "../engine/input/callbackgroup.hpp"
 
class KTech::Widget
{
public:
    struct ChildWidget
    {
        ID<Widget> widget;
        bool oldSelected;
        bool oldShown;
        inline ChildWidget(ID<Widget> widget, bool currentSelected, bool currentShown)
            : widget(widget), oldSelected(currentSelected), oldShown(currentShown) {}
    };
 
    Engine& engine; 
    const ID<Widget> m_id{ID<Widget>::Unique()}; 
    std::string m_name; 
    ID<UI> m_parentUI; 
    ID<Widget> m_parentWidget = nullID<Widget>; 
    std::vector<ChildWidget> m_childWidgets; 
    bool m_selected = false; 
    bool m_shown = true; 
 
    Point m_pos; 
    std::vector<Texture> m_textures = {}; 
    Input::CallbackGroup m_callbackGroup; 
 
    Widget(Engine& engine, Point position = Point(0, 0), std::string name = "");
    Widget(Engine& engine, const ID<UI>& parentUI, Point position = Point(0, 0), std::string name = "");
    virtual ~Widget();
 
    auto AddWidget(const ID<Widget>& widget) -> bool;
    auto RemoveWidget(const ID<Widget>& widget) -> bool;
    auto RemoveAllWidgets() -> bool;
 
    auto EnterWidget(const ID<Widget>& widget) -> bool;
    auto EnterUI(const ID<UI>& ui) -> bool;
    auto LeaveWidget() -> bool;
    auto LeaveUI() -> bool;
 
    void Select();
    void Deselect();
    void Show();
    void Hide();
 
protected:
    virtual auto OnTick() -> bool;
    virtual void OnSelect();
    virtual void OnDeselect();
    virtual void OnShow();
    virtual void OnHide();
 
    friend class KTech::Memory;
};