spk_slider.hpp

#pragma once
 
#include "structure/design_pattern/spk_observable_value.hpp"
#include "structure/system/event/spk_mouse_event.hpp"
#include "structure/widget/components/spk_nine_slice_background.hpp"
#include "structure/widget/spk_widget.hpp"
#include "type/spk_orientation.hpp"
 
#include <algorithm>
#include <cmath>
#include <cstdint>
 
namespace spk
{
    class Slider : public spk::Widget
    {
    private:
        spk::NineSliceBackground _background;
        spk::NineSliceBackground _body;
        float _thumbSizeRatio = 0.25f;
        spk::Orientation _orientation = spk::Orientation::Vertical;
 
        spk::ObservableValue<float> _ratio;
        spk::ObservableValue<float>::Contract _updateGeometryOnRatioEdition;
 
        bool _isDragging = false;
 
        void _updateBodyGeometry();
        float _ratioFromPosition(const spk::Vector2Int &p_position) const;
 
    protected:
        void _onGeometryChange() override;
        void _onPaintEvent(spk::PaintEvent &p_event) override;
        void _onMousePressEvent(spk::MousePressEvent &p_event) override;
        void _onMouseReleaseEvent(spk::MouseReleaseEvent &p_event) override;
        void _onMouseMotionEvent(spk::MouseMotionEvent &p_event) override;
 
    public:
        Slider(const std::wstring &p_name, spk::Widget *p_parent);

        void setThumbSizeRatio(float p_ratio);
        void setOrientation(spk::Orientation p_orientation);

        void setRatio(float p_ratio);
        void adjustRatio(float p_delta);
        float ratioValue() const;

        float thumbSizeRatio() const;

        void setBackgroundTexture(const spk::SpriteSheet *p_spriteSheet);
        void setBodyTexture(const spk::SpriteSheet *p_spriteSheet);
        void setBackgroundCornerSize(const spk::Vector2UInt &p_cornerSize);
        void setBodyCornerSize(const spk::Vector2UInt &p_cornerSize);

        spk::ObservableValue<float> &ratio();
        const spk::ObservableValue<float> &ratio() const;
    };
}