Modal.h

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// Copyright (c) 2025 Dave R. Smith.
// Malena Framework — Licensed under PolyForm Noncommercial 1.0.0; commercial use requires a paid license. See LICENSE.
 
#ifndef MALENA_MODAL_H
#define MALENA_MODAL_H
 
#pragma once
 
#include <Malena/Core/malena_export.h>
#include <Malena/Core/Component.h>
#include <Malena/Manifests/Manifest.h>
#include <Malena/Resources/FontManager.h>
#include <Malena/Graphics/Text/Text.h>
#include <Malena/Traits/Settings/ModalSettings.h>
#include <Malena/Traits/Theme/ModalTheme.h>
#include <Malena/Traits/Theme/Themeable.h>
#include <SFML/Graphics/RectangleShape.hpp>
#include <SFML/Graphics/RenderTarget.hpp>
#include <functional>
#include <string>
 
namespace ml
{
    class MALENA_API ModalManifest : public ml::Manifest
    {
    public:
        enum class Flag  { VISIBLE };
        enum class State { HIDDEN, VISIBLE, ANIMATING };
    };

    class MALENA_API Modal : public ComponentWith<ModalManifest>,
                              public ModalSettings,
                              public ModalTheme,
                              public Themeable
    {
    public:
        using Flag  = ModalManifest::Flag;
        using State = ModalManifest::State;
 
    private:
        // ── Shapes ───────────────────────────────────────────────────────────
        sf::RectangleShape _backdrop;
        sf::RectangleShape _panel;
        sf::RectangleShape _separator;
        sf::RectangleShape _confirmShape;
        sf::RectangleShape _cancelShape;
 
        // ── Text ─────────────────────────────────────────────────────────────
        ml::Text _titleText;
        ml::Text _confirmText;
        ml::Text _cancelText;
        ml::Text _closeText;
 
        // ── Labels ────────────────────────────────────────────────────────────
        std::string _titleStr;
        std::string _confirmStr;
        std::string _cancelStr;
 
        // ── Content ───────────────────────────────────────────────────────────
        ml::Core* _content = nullptr;
 
        // ── Computed bounds (updated in applyLayout) ──────────────────────────
        sf::FloatRect _panelBounds;
        sf::FloatRect _confirmBounds;
        sf::FloatRect _cancelBounds;
        sf::FloatRect _closeBounds;
 
        // ── Animation ─────────────────────────────────────────────────────────
        float _alpha     = 0.f;
        bool  _animating = false;
        bool  _fadingIn  = false;
        bool  _prevDown  = false;
 
        // ── Callbacks ─────────────────────────────────────────────────────────
        std::function<void()> _onConfirm;
        std::function<void()> _onDismiss;
 
        // ── Internal ──────────────────────────────────────────────────────────
        sf::Vector2f  panelOrigin()  const;
        bool          hasButtons()   const;
        float         contentTop()   const;
        float         contentHeight() const;
        void          applyLayout();
        void          applyAlphaToColor(sf::Color& c, float alpha) const;
        void          drawWithAlpha(sf::RenderTarget& t,
                                    const sf::RenderStates& s) const;
 
    protected:
        void draw(sf::RenderTarget& target, sf::RenderStates states) const override;
        void onThemeApplied(const Theme& theme) override;
 
    public:
        explicit Modal(const sf::Font& font = FontManager<>::getDefault());
 
        // ── Content ───────────────────────────────────────────────────────────

        void setTitle(const std::string& title);

        void setContent(ml::Core& content);

        void setConfirmLabel(const std::string& label);

        void setCancelLabel(const std::string& label);
 
        // ── Control ───────────────────────────────────────────────────────────
 
        void show();
        void showImmediate();
        void hide();
        void toggle();
        [[nodiscard]] bool isVisible() const;
 
        // ── Callbacks ─────────────────────────────────────────────────────────

        void onConfirm(std::function<void()> cb);

        void onDismiss(std::function<void()> cb);
 
        // ── Theming ───────────────────────────────────────────────────────────
 
        template<typename S>
        void applySettings(const S& s)
        {
            static_assert(std::is_base_of_v<ModalSettings, S>,
                "applySettings() requires a type derived from ModalSettings");
            static_cast<ModalSettings&>(*this) = s;
            applyLayout();
        }
 
        template<typename T>
        void applyTheme(const T& t)
        {
            static_assert(std::is_base_of_v<ModalTheme, T>,
                "applyTheme() requires a type derived from ModalTheme");
            static_cast<ModalTheme&>(*this) = t;
        }
 
        template<typename St>
        void applyStyle(const St& s)
        {
            static_assert(std::is_base_of_v<ModalSettings, St> &&
                          std::is_base_of_v<ModalTheme, St>,
                "applyStyle() requires ModalSettings and ModalTheme");
            static_cast<ModalSettings&>(*this) = s;
            static_cast<ModalTheme&>(*this)    = s;
            applyLayout();
        }
 
        // ── Positionable ──────────────────────────────────────────────────────
 
        void          setPosition(const sf::Vector2f& pos) override;
        sf::Vector2f  getPosition()     const override;
        sf::FloatRect getGlobalBounds() const override;
    };

    template<typename MANIFEST>
    class ModalWith : public Modal, public Customizable<MANIFEST>
    { public: using Modal::Modal; };
 
} // namespace ml
 
#endif // MALENA_MODAL_H