ui.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/cella.hpp"
#include "../basic/rgba.hpp"
#include "../basic/point.hpp"
#include "../basic/upoint.hpp"
 
#include <limits>
#include <string>
#include <vector>
 
class KTech::UI
{
public:
    Engine& engine; 
    const ID<UI> m_id{ID<UI>::Unique()}; 
    std::string m_name; 
    std::vector<ID<Widget>> m_widgets; 
 
    UPoint m_res; 
    CellA m_background = CellA(' ', RGBA(0, 0, 0, 0), RGBA(0, 0, 0, 0)); 
    uint8_t m_alpha = std::numeric_limits<uint8_t>::max(); 
    RGBA m_frgba = RGBAColors::transparent; 
    RGBA m_brgba = RGBAColors::transparent; 
    std::vector<CellA> m_image; 
 
    UI(Engine& engine, UPoint resolution = UPoint(10, 10), std::string name = "");
    virtual ~UI();
 
    auto AddWidget(const ID<Widget>& widget) -> bool;
    auto RemoveWidget(const ID<Widget>& widget) -> bool;
    auto RemoveAllWidgets() -> bool;
 
    void Resize(UPoint resolution);
 
    void Render();
    void Draw(Point position = Point(0, 0), UPoint start = UPoint(0, 0), UPoint end = UPoint(0, 0), uint8_t alpha = std::numeric_limits<uint8_t>::max());
    void RenderClearDrawPrint();
 
protected:
    virtual auto OnTick() -> bool;
 
    friend class KTech::Memory;
 
private:
    inline void RenderBackground();
    inline void RenderSimple(Widget* widget, Texture& texture);
    inline void RenderComplex(Widget* widget, Texture& texture);
    inline void RenderForeground();
};