slider.hpp

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#pragma once
 
#include "lmgl/ui/ui_element.hpp"
#include "lmgl/ui/panel.hpp"
#include "lmgl/ui/text.hpp"
 
#include <functional>
#include <glm/glm.hpp>
#include <memory>
#include <string>
 
namespace lmgl {
 
namespace ui {

class Slider : public UIElement {
  public:
    Slider(float min = 0.0f, float max = 1.0f, float initial_value = 0.5f, const std::string &name = "Slider");

    ~Slider() override = default;

    void set_value(float value);

    inline float get_value() const { return m_value; }

    void set_range(float min, float max);

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

    inline void set_on_value_changed(std::function<void(float)> callback) { m_on_value_changed = callback; }

    inline void set_show_value(bool show) { m_show_value = show; }

    inline std::shared_ptr<Text> get_label_text() { return m_label_text; }

    inline std::shared_ptr<Text> get_value_text() { return m_value_text; }

    bool contains_point(float x, float y, float canvas_width, float canvas_height) const;

    bool handle_mouse_button(float x, float y, bool pressed, float canvas_width, float canvas_height);

    void handle_mouse_drag(float x, float y, float canvas_width, float canvas_height);

    void render(float canvas_width, float canvas_height, const glm::mat4 &projection) override;
 
  private:
    float m_value;

    float m_min;
    float m_max;

    bool m_dragging{false};

    std::string m_label;

    bool m_show_value{true};

    float m_track_height{4.0f};

    float m_handle_size{16.0f};

    std::shared_ptr<Panel> m_track_bg;

    std::shared_ptr<Panel> m_track_fill;

    std::shared_ptr<Panel> m_handle;

    std::shared_ptr<Text> m_label_text;

    std::shared_ptr<Text> m_value_text;

    std::function<void(float)> m_on_value_changed;

    glm::vec4 m_track_color{0.3f, 0.3f, 0.3f, 1.0f};
    glm::vec4 m_fill_color{0.0f, 0.6f, 1.0f, 1.0f};
    glm::vec4 m_handle_color{1.0f, 1.0f, 1.0f, 1.0f};
    glm::vec4 m_text_color{1.0f, 1.0f, 1.0f, 1.0f};

    void update_value_from_mouse(float mouse_x, float canvas_width, float canvas_height);
};
 
} // namespace ui
 
} // namespace lmgl