canvas.hpp

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#pragma once
 
#include "lmgl/ui/ui_element.hpp"
 
#include <glm/glm.hpp>
#include <memory>
#include <vector>
 
namespace lmgl {
 
namespace ui {

class Canvas {
  public:
    Canvas(int width = 1920, int height = 1080);

    ~Canvas() = default;

    void resize(int width, int height);

    void add_element(std::shared_ptr<UIElement> element);

    void remove_element(std::shared_ptr<UIElement> element);

    inline const std::vector<std::shared_ptr<UIElement>> &get_elements() const { return m_elements; }

    void render();

    inline const glm::mat4 &get_projection_matrix() const { return m_projection; }

    inline int get_width() const { return m_width; }

    inline int get_height() const { return m_height; }

    inline void set_visible(bool visible) { m_visible = visible; }

    inline bool is_visible() const { return m_visible; }
 
  private:
    int m_width;

    int m_height;

    glm::mat4 m_projection;

    std::vector<std::shared_ptr<UIElement>> m_elements;

    bool m_visible = true;

    void update_projection();

    void collect_render_items(std::vector<std::shared_ptr<UIElement>> &out_items);

    void collect_element_recursive(const std::shared_ptr<UIElement> element,
                                   std::vector<std::shared_ptr<UIElement>> &out_items);
};
 
} // namespace ui
 
} // namespace lmgl