ScrollPane.h

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#ifndef MALENA_SCROLLPANE_H
#define MALENA_SCROLLPANE_H
 
#include <Malena/Core/malena_export.h>
#include <SFML/Graphics.hpp>
#include <vector>
#include <Malena/Core/Component.h>
#include <Malena/Graphics/Primitives/Rectangle.h>
#include <Malena/Manifests/ManifestResources.h>
#include "ScrollPaneManifest.h"
 
namespace ml
{
    class MALENA_API ScrollPane : public ml::Component<ScrollPaneManifest>
    {
    public:
        using App   = ml::ManifestResources<ScrollPaneManifest>;
        using State = ScrollPaneManifest::State;
        using Flag  = ScrollPaneManifest::Flag;
 
        ScrollPane(float width, float height);
 
        void addComponent(ml::Core& component);
        void removeComponent(ml::Core& component);
 
        // ── Styling ───────────────────────────────────────────────────────────
        void setBackgroundColor(sf::Color color);
        void setScrollBarColor(sf::Color color);
        void setScrollBarWidth(float width);
 
        // ── Layout ────────────────────────────────────────────────────────────
        void setPosition(const sf::Vector2f& position) override;
        sf::Vector2f  getPosition()     const override;
        sf::FloatRect getGlobalBounds() const override;
        sf::RenderStates getRenderStates() const override;
        void setSize(float width, float height);
 
        // ── External scroll control ───────────────────────────────────────────

        [[nodiscard]] float getScrollOffsetY() const;

        void setScrollOffsetY(float y);

        void setContentHeight(float height);

        void embed();
 
    protected:
        void draw(sf::RenderTarget& target, sf::RenderStates states) const override;
 
    private:
        float _width;
        float _height;
        float _scrollOffsetY      = 0.f;
        float _scrollOffsetX      = 0.f;
        float _scrollSpeed        = 20.f;
        float _scrollBarWidth     = 8.f;
        float _contentHeightOverride = 0.f; 
 
        sf::Vector2f _position = {0.f, 0.f};
 
        sf::RectangleShape         _background;
        mutable sf::RectangleShape _scrollBarTrack;
        mutable ml::Rectangle      _scrollBarThumb;
 
        mutable sf::RenderTexture  _renderTexture;
        std::vector<ml::Core*>     _children;
 
        sf::Color _scrollBarTrackColor = sf::Color(200, 200, 200, 150);
        sf::Color _scrollBarThumbColor = sf::Color(100, 100, 100, 200);
 
        void  stackChildren()           const;
        float getTotalContentHeight()   const;
        float getTotalContentWidth()    const;
        void  updateScrollBar()         const;
    };
}
 
#endif //SCROLLPANE_H