Class FGUIRuntimeModule

packages/fairygui/src/ecs/FGUIRuntimeModule.ts:28–142

 * 实现 IRuntimeModule 的 FairyGUI 集成模块
 */
export class FGUIRuntimeModule implements IRuntimeModule {
    private _renderSystem: FGUIRenderSystem | null = null;
    private _loaderRegistered = false;

    /**
     * Register components to ComponentRegistry
     * 注册组件到 ComponentRegistry
     */
    registerComponents(registry: IComponentRegistry): void {
        registry.register(FGUIComponent);
    }

    /**
     * Create systems for scene
     * 为场景创建系统
     */
    createSystems(scene: IScene, context: SystemContext): void {
        // Get asset manager from service registry
        const assetManager = context.services.get(AssetManagerToken);

        // Register FUI asset loader
        if (!this._loaderRegistered && assetManager) {
            const loader = new FUIAssetLoader();
            (assetManager as IAssetManager).registerLoader(FUI_ASSET_TYPE, loader);
            this._loaderRegistered = true;
        }

        // Create and add FGUIUpdateSystem
        const updateSystem = new FGUIUpdateSystem();
        if (assetManager) {
            updateSystem.setAssetManager(assetManager as IAssetManager);
        }
        scene.addSystem(updateSystem);
    }

    /**
     * Called after all systems are created
     * 所有系统创建完成后调用
     */
    onSystemsCreated(_scene: IScene, context: SystemContext): void {
        // Create render system (not an EntitySystem, handles its own update)
        this._renderSystem = new FGUIRenderSystem();

        // Set asset manager for the render system
        const assetManager = context.services.get(AssetManagerToken);
        if (assetManager) {
            this._renderSystem.setAssetManager(assetManager as IAssetManager);
        }

        // Bind Stage to canvas for input events
        const canvas = context.services.get(CanvasElementToken);
        if (canvas) {
            Stage.inst.bindToCanvas(canvas);
        }

        // Initialize dynamic font system with system default font
        // 使用系统默认字体初始化动态字体系统
        this.initDynamicFonts();