Created unity project

3D FPS/Library/PackageCache/com.unity.collab-proxy@2.6.0/Editor/UI/UIElements/LoadingSpinner.cs

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+using UnityEngine;
+using UnityEditor;
+using UnityEngine.UIElements;
+
+namespace Unity.PlasticSCM.Editor.UI.UIElements
+{
+    internal class LoadingSpinner : VisualElement
+    {
+        internal LoadingSpinner()
+        {
+            mStarted = false;
+
+            // add child elements to set up centered spinner rotation
+            mSpinner = new VisualElement();
+            Add(mSpinner);
+
+            mSpinner.style.backgroundImage = Images.GetImage(Images.Name.Loading);
+            mSpinner.style.position = Position.Absolute;
+            mSpinner.style.width = 16;
+            mSpinner.style.height = 16;
+            mSpinner.style.left = -8;
+            mSpinner.style.top = -8;
+
+            style.position = Position.Relative;
+            style.width = 16;
+            style.height = 16;
+            style.left = 8;
+            style.top = 8;
+        }
+
+        internal void Dispose()
+        {
+            if (mStarted)
+                EditorApplication.update -= UpdateProgress;
+        }
+
+        internal void Start()
+        {
+            if (mStarted)
+                return;
+
+            mRotation = 0;
+            mLastRotationTime = EditorApplication.timeSinceStartup;
+
+            EditorApplication.update += UpdateProgress;
+
+            mStarted = true;
+        }
+
+        internal void Stop()
+        {
+            if (!mStarted)
+                return;
+
+            EditorApplication.update -= UpdateProgress;
+
+            mStarted = false;
+        }
+
+        void UpdateProgress()
+        {
+            double currentTime = EditorApplication.timeSinceStartup;
+            double deltaTime = currentTime - mLastRotationTime;
+
+            mSpinner.transform.rotation = Quaternion.Euler(0, 0, mRotation);
+
+            mRotation += (int)(ROTATION_SPEED * deltaTime);
+            mRotation = mRotation % 360;
+            if (mRotation < 0) mRotation += 360;
+
+            mLastRotationTime = currentTime;
+        }
+
+        int mRotation;
+        double mLastRotationTime;
+        bool mStarted;
+        VisualElement mSpinner;
+
+        const int ROTATION_SPEED = 360; // Euler degrees per second
+    }
+}