refactor

Runtime/Engine/Code/Services/Development/DebugOverlayView.cs

@@ -1,28 +1,39 @@
-using System.Threading;
-using Cysharp.Threading.Tasks;
+using System;
 using RebootKit.Engine.UI;
 using UnityEngine;
 using UnityEngine.UIElements;
 
 namespace RebootKit.Engine.Services.Development {
-    public class DebugOverlayView : MonoBehaviour, IView {
-        [SerializeField] UIDocument m_Document;
-
-        void Start() {
-        }
-
-        public async UniTask Show(CancellationToken cancellationToken) {
-            gameObject.SetActive(true);
-            await UniTask.Yield(cancellationToken);
-        }
-
-        public async UniTask Hide(CancellationToken cancellationToken) {
-            gameObject.SetActive(false);
-            await UniTask.Yield(cancellationToken);
-        }
+    public class DebugOverlayView : UIDocumentView {
+        const string k_DebugLabelClassName = "rr__debug-label";
         
-        void SetOverlayModeChanged(int mode) {
+        VisualElement m_RootElement;
+        
+        Label m_FPSLabel;
 
+        void Update() {
+            if (m_RootElement == null) {
+                return;
+            }
+
+            m_FPSLabel.text = $"fps: {Mathf.RoundToInt(1f / Time.deltaTime)} | dt: {Time.deltaTime:F4}ms | runtime: {Time.time:F4}s";
+        }
+
+        public override VisualElement Build() {
+            m_RootElement = new VisualElement();
+            
+            CreateLabel($"Toggle Overlay [F3] | RebootKit | game: {Application.productName}, version: {Application.version}");
+            m_FPSLabel = CreateLabel($"FPS: {Application.targetFrameRate}");
+
+            return m_RootElement;
+        }
+
+        Label CreateLabel(string text) {
+            Label label = (Label)LabelBuilder.New(text).Build();
+            label.AddToClassList(k_DebugLabelClassName);
+
+            m_RootElement.Add(label);
+            return label;
         }
     }
 }