ui_file_interface.hpp

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#pragma once
#include <RmlUi/Core/FileInterface.h>
#include <cstdint>
#include <functional>
#include <optional>
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
 
namespace ui {

class UIFileInterface final : public Rml::FileInterface {
public:
  using ColorResolver = std::function<std::optional<std::string>(std::string_view)>;
 
  explicit UIFileInterface(ColorResolver color_resolver);
 
  auto Open(const Rml::String& path) -> Rml::FileHandle override;
  void Close(Rml::FileHandle file) override;
 
  auto Read(void* buffer, size_t size, Rml::FileHandle file) -> size_t override;
  auto Seek(Rml::FileHandle file, long offset, int origin) -> bool override;
  auto Tell(Rml::FileHandle file) -> size_t override;
  auto Length(Rml::FileHandle file) -> size_t override;
 
private:
  struct OpenFile {
    std::vector<uint8_t> data;
    size_t cursor = 0;
  };
 
  Rml::FileHandle m_next_handle = 1;
  std::unordered_map<Rml::FileHandle, OpenFile> m_open_files;
  ColorResolver m_color_resolver;
};
 
}