RadioGroup.h

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//
// RadioGroup.h
//
 
#ifndef MALENA_RADIOGROUP_H
#define MALENA_RADIOGROUP_H
 
#pragma once
 
#include <Malena/Core/malena_export.h>
#include <Malena/Core/Component.h>
#include <Malena/Manifests/Manifest.h>
#include <Malena/Graphics/Controls/RadioButton.h>
#include <Malena/Graphics/Primitives/Rectangle.h>
#include <Malena/Resources/FontManager.h>
#include <Malena/Traits/Settings/RadioGroupSettings.h>
#include <Malena/Traits/Theme/RadioGroupTheme.h>
#include <Malena/Traits/Theme/Themeable.h>
#include <SFML/Graphics/RenderTarget.hpp>
#include <functional>
#include <string>
#include <vector>
#include <memory>
#include <type_traits>
 
namespace ml
{
    class MALENA_API RadioGroupManifest : public ml::Manifest
    {
    public:
        enum class Flag { SHOW_BACKGROUND };
    };

    class MALENA_API RadioGroup : public ComponentWith<RadioGroupManifest>,
                       public RadioGroupSettings,
                       public RadioGroupTheme,
                       public Themeable
    {
    public:
        using Flag = RadioGroupManifest::Flag;
 
    private:
        std::vector<std::unique_ptr<RadioButton>> _owned;
        std::vector<RadioButton*>                 _buttons;
        RadioButton*                              _selected = nullptr;
 
        sf::Vector2f  _position = {0.f, 0.f};
        ml::Rectangle _background;
 
        std::function<void(const std::string&, std::size_t)> _onSelectionChanged;
 
        void layout();
        void applyStylesToButton(RadioButton& btn);
        void wire(RadioButton& btn);
        void handleClick(RadioButton& clicked);
 
    protected:
        void draw(sf::RenderTarget& target, sf::RenderStates states) const override;
        void onThemeApplied(const Theme& theme) override;
 
    public:
        explicit RadioGroup(const sf::Font& font = FontManager<>::getDefault());
 
        RadioGroup(const RadioGroup&)            = delete;
        RadioGroup& operator=(const RadioGroup&) = delete;
 
        // ── Apply ─────────────────────────────────────────────────────────────
 
        template<typename S>
        void applySettings(const S& s)
        {
            static_assert(std::is_base_of_v<RadioGroupSettings, S>,
                "applySettings() requires a type derived from RadioGroupSettings");
            static_cast<RadioGroupSettings&>(*this) = s;
            for (auto* btn : _buttons) applyStylesToButton(*btn);
            layout();
        }
 
        template<typename T>
        void applyTheme(const T& t)
        {
            static_assert(std::is_base_of_v<RadioGroupTheme, T>,
                "applyTheme() requires a type derived from RadioGroupTheme");
            static_cast<RadioGroupTheme&>(*this) = t;
            for (auto* btn : _buttons) applyStylesToButton(*btn);
        }
 
        template<typename St>
        void applyStyle(const St& s)
        {
            static_assert(std::is_base_of_v<RadioGroupSettings, St> &&
                          std::is_base_of_v<RadioGroupTheme, St>,
                "applyStyle() requires RadioGroupSettings and RadioGroupTheme");
            static_cast<RadioGroupSettings&>(*this) = s;
            static_cast<RadioGroupTheme&>(*this)    = s;
            for (auto* btn : _buttons) applyStylesToButton(*btn);
            layout();
        }
 
        // ── Adding options ────────────────────────────────────────────────────
 
        void addOption(const std::string& label);
        void add(RadioButton& button);
        void clearOptions();
        [[nodiscard]] std::size_t optionCount() const;
 
        // ── Selection ─────────────────────────────────────────────────────────
 
        void select(std::size_t index);
        void selectFirst();
        [[nodiscard]] std::string   getSelectedLabel() const;
        [[nodiscard]] std::size_t   getSelectedIndex() const;
        [[nodiscard]] RadioButton*  getSelected()      const;
 
        // ── Callback ─────────────────────────────────────────────────────────
 
        void onSelectionChanged(
            std::function<void(const std::string&, std::size_t)> callback);
 
        // ── Option enabled ────────────────────────────────────────────────────
 
        void setOptionEnabled(std::size_t index, bool enabled);
 
        // ── Positionable ──────────────────────────────────────────────────────
 
        void          setPosition(const sf::Vector2f& position) override;
        sf::Vector2f  getPosition()     const override;
        sf::FloatRect getGlobalBounds() const override;
    };
 
    template<typename MANIFEST>
    class RadioGroupWith : public RadioGroup, public Customizable<MANIFEST>
    { public: using RadioGroup::RadioGroup; };
 
} // namespace ml
 
#endif // MALENA_RADIOGROUP_H