add imgui menu bar draft

framework/imgui/src/mm/services/imgui_menu_bar.cpp

@@ -0,0 +1,98 @@
+#include "./imgui_menu_bar.hpp"
+
+#include <mm/engine.hpp>
+#include <entt/core/hashed_string.hpp>
+
+#include <imgui/imgui.h>
+
+#include <unordered_set>
+
+#include <mm/logger.hpp>
+#define LOG_CRIT(...)		__LOG_CRIT(	"ImGuiMenuBar", __VA_ARGS__)
+#define LOG_ERROR(...)		__LOG_ERROR("ImGuiMenuBar", __VA_ARGS__)
+#define LOG_WARN(...)		__LOG_WARN(	"ImGuiMenuBar", __VA_ARGS__)
+#define LOG_INFO(...)		__LOG_INFO(	"ImGuiMenuBar", __VA_ARGS__)
+#define LOG_DEBUG(...)		__LOG_DEBUG("ImGuiMenuBar", __VA_ARGS__)
+#define LOG_TRACE(...)		__LOG_TRACE("ImGuiMenuBar", __VA_ARGS__)
+
+namespace MM::Services {
+
+	bool ImGuiMenuBar::enable(Engine& engine) {
+		MM::Logger::initSectionLogger("ImGuiMenuBar");
+
+		auto* sdl_ss = engine.tryService<MM::Services::SDLService>();
+		if (sdl_ss) {
+			_event_handle = sdl_ss->addEventHandler([this](const SDL_Event& e) -> bool {
+				if (e.type == SDL_KEYDOWN && !e.key.repeat && e.key.keysym.sym == toggle_key) {
+					show_menu_bar = !show_menu_bar;
+				}
+				return false; // invis
+			});
+		} else {
+			LOG_WARN("no SDLService, skipping toggle hotkey");
+		}
+
+		return true;
+	}
+
+	void ImGuiMenuBar::disable(Engine& engine) {
+		if (_event_handle) {
+			auto* sdl_ss = engine.tryService<MM::Services::SDLService>();
+			sdl_ss->removeEventHandler(_event_handle);
+			_event_handle = nullptr;
+		}
+	}
+
+	std::vector<UpdateStrategies::UpdateCreationInfo> ImGuiMenuBar::registerUpdates(void) {
+	using namespace entt::literals;
+		return {
+			{
+				"ImGuiMenuBar::render"_hs,
+				"ImGuiMenuBar::render",
+				[this](Engine& e){ renderImGui(e); }
+			}
+		};
+	}
+
+	void ImGuiMenuBar::renderImGui(Engine& engine) {
+		if (show_menu_bar && ImGui::BeginMainMenuBar()) {
+
+			// TODO: better solution?
+			std::unordered_set<std::string> done;
+
+			// we dont check for errors in section_order
+			for (const auto& section_key : section_order) {
+				if (menu_tree.count(section_key)) {
+					renderSection(engine, section_key, menu_tree[section_key]);
+
+					done.emplace(section_key);
+				}
+			}
+
+			for (auto& [section_key, section_data] : menu_tree) {
+				if (done.count(section_key)) {
+					continue;
+				}
+
+				renderSection(engine, section_key, section_data);
+
+				done.emplace(section_key); // we dont need this
+			}
+
+
+			ImGui::Text("%.1fFPS", ImGui::GetIO().Framerate);
+			ImGui::EndMainMenuBar();
+		}
+	}
+
+	void ImGuiMenuBar::renderSection(Engine& engine, const std::string& section_key, section_t& section) {
+		if (ImGui::BeginMenu(section_key.c_str())) {
+			for (auto& item : section) {
+				item.second(engine);
+			}
+			ImGui::EndMenu();
+		}
+	}
+
+} // namespace MM::Services
+