Mario Editor: add option to select a level to load

mario/scenes/editor_main_menu.cpp

@@ -29,6 +29,17 @@ void resumeMainMenuCallback(void * /*UNUSED*/, Button * /*UNUSED*/) {
     resumeMainMenu();
 }
 
+void loadFinished(const std::string level_name) {
+    __quit_scenes_main_menu = true;
+    loadMapDialogCallback(level_name);
+}
+
+void showLoadMenu(void */*UNUSED*/, Button */*UNUSED*/) {
+    // TODO levels
+    auto loadMenu = createLoadScene(__buttons_main_menu.back()->getRenderer(), "levels", loadFinished);
+    game_scenes.push_back(loadMenu);
+}
+
 void __updateSelectedButton_MainMenu(uint64_t new_index) {
     if (new_index != __cur_button_index_main_menu &&
         new_index != (uint64_t)-1) {
@@ -120,7 +131,7 @@ createSceneMainMenu(std::shared_ptr<SDLPP::Renderer> &renderer) {
     __buttons_main_menu.back()->setButtonIndex(__buttons_main_menu.size() - 1);
     __buttons_main_menu.emplace_back(std::make_shared<Button>(
         0.2, 0.4, 0.6, 0.1, renderer, "LOAD", default_button_theme,
-        loadMapDialogCallback, nullptr));
+        showLoadMenu, nullptr));
     __buttons_main_menu.back()->setAlignment(SDLPP::OBJ_CENTER,
                                              SDLPP::OBJ_CENTER);
     __buttons_main_menu.back()->setPermanent();