Refine new_editor scene viewport flow

new_editor/app/Scene/EditorSceneBridge.cpp

@@ -0,0 +1,320 @@
+#include "Scene/EditorSceneBridge.h"
+
+#include <XCEngine/Components/ComponentFactoryRegistry.h>
+#include <XCEngine/Components/GameObject.h>
+#include <XCEngine/Components/TransformComponent.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
+#include <XCEngine/Scene/Scene.h>
+#include <XCEngine/Scene/SceneManager.h>
+
+#include <charconv>
+#include <filesystem>
+#include <optional>
+#include <sstream>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+namespace XCEngine::UI::Editor::App {
+
+namespace {
+
+using ::XCEngine::Components::Component;
+using ::XCEngine::Components::ComponentFactoryRegistry;
+using ::XCEngine::Components::GameObject;
+using ::XCEngine::Components::Scene;
+using ::XCEngine::Components::SceneManager;
+using ::XCEngine::Components::TransformComponent;
+using ::XCEngine::Resources::ResourceManager;
+
+struct ClipboardNode {
+    std::string name = {};
+    std::string transformPayload = {};
+    std::vector<std::pair<std::string, std::string>> components = {};
+    std::vector<ClipboardNode> children = {};
+};
+
+Scene* ResolvePrimaryScene() {
+    SceneManager& sceneManager = SceneManager::Get();
+    if (Scene* activeScene = sceneManager.GetActiveScene();
+        activeScene != nullptr) {
+        return activeScene;
+    }
+
+    const std::vector<Scene*> scenes = sceneManager.GetAllScenes();
+    if (!scenes.empty() && scenes.front() != nullptr) {
+        sceneManager.SetActiveScene(scenes.front());
+        return scenes.front();
+    }
+
+    return nullptr;
+}
+
+std::pair<std::string, std::string> SerializeComponent(
+    const Component* component) {
+    std::ostringstream payload = {};
+    component->Serialize(payload);
+    return { component->GetName(), payload.str() };
+}
+
+ClipboardNode CopyGameObjectRecursive(const GameObject& gameObject) {
+    ClipboardNode node = {};
+    node.name = gameObject.GetName();
+
+    if (const TransformComponent* transform = gameObject.GetTransform();
+        transform != nullptr) {
+        std::ostringstream payload = {};
+        transform->Serialize(payload);
+        node.transformPayload = payload.str();
+    }
+
+    const auto components = gameObject.GetComponents<Component>();
+    for (const Component* component : components) {
+        if (component == nullptr || component == gameObject.GetTransform()) {
+            continue;
+        }
+
+        node.components.push_back(SerializeComponent(component));
+    }
+
+    for (GameObject* child : gameObject.GetChildren()) {
+        if (child == nullptr) {
+            continue;
+        }
+
+        node.children.push_back(CopyGameObjectRecursive(*child));
+    }
+
+    return node;
+}
+
+GameObject* PasteGameObjectRecursive(
+    Scene& scene,
+    const ClipboardNode& node,
+    GameObject* parent) {
+    GameObject* gameObject = scene.CreateGameObject(node.name, parent);
+    if (gameObject == nullptr) {
+        return nullptr;
+    }
+
+    if (!node.transformPayload.empty()) {
+        if (TransformComponent* transform = gameObject->GetTransform();
+            transform != nullptr) {
+            std::istringstream transformStream(node.transformPayload);
+            transform->Deserialize(transformStream);
+        }
+    }
+
+    for (const auto& componentData : node.components) {
+        Component* component =
+            ComponentFactoryRegistry::Get().CreateComponent(
+                gameObject,
+                componentData.first);
+        if (component == nullptr || componentData.second.empty()) {
+            continue;
+        }
+
+        std::istringstream payloadStream(componentData.second);
+        component->Deserialize(payloadStream);
+    }
+
+    for (const ClipboardNode& child : node.children) {
+        PasteGameObjectRecursive(scene, child, gameObject);
+    }
+
+    return gameObject;
+}
+
+bool WouldCreateCycle(
+    const GameObject& source,
+    const GameObject& targetParent) {
+    const GameObject* current = &targetParent;
+    while (current != nullptr) {
+        if (current == &source) {
+            return true;
+        }
+        current = current->GetParent();
+    }
+
+    return false;
+}
+
+} // namespace
+
+EditorStartupSceneResult EnsureEditorStartupScene(
+    const std::filesystem::path& projectRoot) {
+    EditorStartupSceneResult result = {};
+    if (projectRoot.empty()) {
+        return result;
+    }
+
+    ResourceManager::Get().SetResourceRoot(projectRoot.string().c_str());
+
+    if (Scene* activeScene = ResolvePrimaryScene();
+        activeScene != nullptr) {
+        result.ready = true;
+        result.sceneName = activeScene->GetName();
+        return result;
+    }
+
+    const std::filesystem::path startupScenePath =
+        (projectRoot / "Assets" / "Scenes" / "Main.xc").lexically_normal();
+    SceneManager& sceneManager = SceneManager::Get();
+
+    if (std::filesystem::exists(startupScenePath) &&
+        std::filesystem::is_regular_file(startupScenePath)) {
+        sceneManager.LoadScene(startupScenePath.string());
+        Scene* loadedScene = sceneManager.GetScene(startupScenePath.stem().string());
+        if (loadedScene == nullptr) {
+            loadedScene = ResolvePrimaryScene();
+        } else {
+            sceneManager.SetActiveScene(loadedScene);
+        }
+
+        if (loadedScene != nullptr) {
+            result.ready = true;
+            result.loadedFromDisk = true;
+            result.scenePath = startupScenePath;
+            result.sceneName = loadedScene->GetName();
+            return result;
+        }
+    }
+
+    if (Scene* scene = sceneManager.CreateScene("Main");
+        scene != nullptr) {
+        sceneManager.SetActiveScene(scene);
+        result.ready = true;
+        result.sceneName = scene->GetName();
+    }
+
+    return result;
+}
+
+Scene* GetActiveEditorScene() {
+    return ResolvePrimaryScene();
+}
+
+bool OpenEditorSceneAsset(const std::filesystem::path& scenePath) {
+    if (scenePath.empty()) {
+        return false;
+    }
+
+    std::error_code errorCode = {};
+    if (!std::filesystem::exists(scenePath, errorCode) ||
+        errorCode ||
+        !std::filesystem::is_regular_file(scenePath, errorCode)) {
+        return false;
+    }
+
+    SceneManager& sceneManager = SceneManager::Get();
+    sceneManager.LoadScene(scenePath.string());
+    Scene* loadedScene = sceneManager.GetScene(scenePath.stem().string());
+    if (loadedScene == nullptr) {
+        loadedScene = ResolvePrimaryScene();
+    } else {
+        sceneManager.SetActiveScene(loadedScene);
+    }
+
+    return loadedScene != nullptr;
+}
+
+std::string MakeEditorGameObjectItemId(GameObject::ID id) {
+    return id == GameObject::INVALID_ID ? std::string() : std::to_string(id);
+}
+
+std::optional<GameObject::ID> ParseEditorGameObjectItemId(
+    std::string_view itemId) {
+    if (itemId.empty()) {
+        return std::nullopt;
+    }
+
+    GameObject::ID parsedId = GameObject::INVALID_ID;
+    const char* first = itemId.data();
+    const char* last = itemId.data() + itemId.size();
+    const std::from_chars_result result =
+        std::from_chars(first, last, parsedId);
+    if (result.ec != std::errc() || result.ptr != last ||
+        parsedId == GameObject::INVALID_ID) {
+        return std::nullopt;
+    }
+
+    return parsedId;
+}
+
+GameObject* FindEditorGameObject(std::string_view itemId) {
+    Scene* scene = ResolvePrimaryScene();
+    const std::optional<GameObject::ID> gameObjectId =
+        ParseEditorGameObjectItemId(itemId);
+    if (scene == nullptr || !gameObjectId.has_value()) {
+        return nullptr;
+    }
+
+    return scene->FindByID(gameObjectId.value());
+}
+
+bool RenameEditorGameObject(
+    std::string_view itemId,
+    std::string_view newName) {
+    GameObject* gameObject = FindEditorGameObject(itemId);
+    if (gameObject == nullptr) {
+        return false;
+    }
+
+    gameObject->SetName(std::string(newName));
+    return true;
+}
+
+bool DeleteEditorGameObject(std::string_view itemId) {
+    Scene* scene = ResolvePrimaryScene();
+    GameObject* gameObject = FindEditorGameObject(itemId);
+    if (scene == nullptr || gameObject == nullptr) {
+        return false;
+    }
+
+    scene->DestroyGameObject(gameObject);
+    return true;
+}
+
+std::string DuplicateEditorGameObject(std::string_view itemId) {
+    Scene* scene = ResolvePrimaryScene();
+    GameObject* gameObject = FindEditorGameObject(itemId);
+    if (scene == nullptr || gameObject == nullptr) {
+        return {};
+    }
+
+    const ClipboardNode clipboard = CopyGameObjectRecursive(*gameObject);
+    GameObject* duplicate =
+        PasteGameObjectRecursive(*scene, clipboard, gameObject->GetParent());
+    return duplicate != nullptr
+        ? MakeEditorGameObjectItemId(duplicate->GetID())
+        : std::string();
+}
+
+bool ReparentEditorGameObject(
+    std::string_view itemId,
+    std::string_view parentItemId) {
+    GameObject* gameObject = FindEditorGameObject(itemId);
+    GameObject* newParent = FindEditorGameObject(parentItemId);
+    if (gameObject == nullptr || newParent == nullptr ||
+        gameObject == newParent ||
+        gameObject->GetParent() == newParent ||
+        WouldCreateCycle(*gameObject, *newParent)) {
+        return false;
+    }
+
+    gameObject->SetParent(newParent);
+    return true;
+}
+
+bool MoveEditorGameObjectToRoot(std::string_view itemId) {
+    GameObject* gameObject = FindEditorGameObject(itemId);
+    if (gameObject == nullptr || gameObject->GetParent() == nullptr) {
+        return false;
+    }
+
+    gameObject->SetParent(nullptr);
+    return true;
+}
+
+} // namespace XCEngine::UI::Editor::App