ui_loader.hpp

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#pragma once
 
#include "lmgl/ui/canvas.hpp"
#include "lmgl/ui/ui_element.hpp"
 
#include <functional>
#include <map>
#include <memory>
#include <string>
 
namespace lmgl {
 
namespace ui {

class UICallbackRegistry {
  public:
    void register_callback(const std::string &name, std::function<void()> callback);

    std::function<void()> get_callback(const std::string &name) const;

    bool has_callback(const std::string &name) const;
 
  private:
    std::map<std::string, std::function<void()>> m_callbacks;
};

struct UILoadResult {
    bool success{false};

    std::string error;

    std::shared_ptr<Canvas> canvas;

    std::map<std::string, std::shared_ptr<UIElement>> elements;
};

class UILoader {
  public:
    UILoader();

    UILoadResult load_from_file(const std::string &filepath, const UICallbackRegistry &callbacks);

    UILoadResult load_from_string(const std::string &json_str, const UICallbackRegistry &callbacks);

    void set_base_path(const std::string &base_path);
 
  private:
    std::string m_base_path;

    UILoadResult load_internal(const void *json_data, const UICallbackRegistry &callbacks);
};
 
} // namespace ui
 
} // namespace lmgl