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Assets/Mirror/Hosting/Edgegap/Editor/ButtonShaker.cs

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+using System.Threading.Tasks;
+using UnityEngine.UIElements;
+
+namespace Edgegap.Editor
+{
+    /// <summary>Slightly shake a UI button to indicate attention.</summary>
+    public class ButtonShaker
+    {
+        const string SHAKE_START_CLASS = "shakeStart";
+        const string SHAKE_STOP_CLASS = "shakeEnd";
+        private Button targetButton;
+
+        public ButtonShaker(Button buttonToShake) =>
+            targetButton = buttonToShake;
+
+        /// <summary>Shake the button x times for x msDelayBetweenShakes each.
+        /// 1 shake = 1 bigger -> followed by 1 smaller.</summary>
+        /// <param name="msDelayBetweenShakes"></param>
+        /// <param name="iterations"># of shakes</param>
+        public async Task ApplyShakeAsync(int msDelayBetweenShakes = 40, int iterations = 2)
+        {
+            for (int i = 0; i < iterations; i++)
+                await shakeOnce(msDelayBetweenShakes);
+        }
+
+        private async Task shakeOnce(int msDelayBetweenShakes)
+        {
+            targetButton.AddToClassList(SHAKE_START_CLASS);
+            await Task.Delay(msDelayBetweenShakes); // duration of the first transition
+            targetButton.RemoveFromClassList(SHAKE_START_CLASS);
+            
+            targetButton.AddToClassList(SHAKE_STOP_CLASS);
+            await Task.Delay(msDelayBetweenShakes); // duration of the second transition
+            targetButton.RemoveFromClassList(SHAKE_STOP_CLASS);
+        }
+    }
+}