Merge pull request #25 from dou867/jstimeout

WI00709656 GetBoundingClientRect don't throw on time out

src/Blazor.Diagrams/Extensions/JSRuntimeExtensions.cs

@@ -10,7 +10,14 @@ public static class JSRuntimeExtensions
 {
     public static async Task<Rectangle?> GetBoundingClientRect(this IJSRuntime jsRuntime, ElementReference element)
     {
-        return await jsRuntime.InvokeAsync<Rectangle>("ZBlazorDiagrams.getBoundingClientRect", element);
+        try
+        {
+            return await jsRuntime.InvokeAsync<Rectangle>("ZBlazorDiagrams.getBoundingClientRect", element);
+        }
+        catch (TaskCanceledException) 
+        { 
+            return null;
+        }
     }
 
     public static async Task ObserveResizes<T>(this IJSRuntime jsRuntime, ElementReference element,

tests/Blazor.Diagrams.Tests/Extensions/JSRuntimeExtensionsTest.cs

@@ -0,0 +1,21 @@
+using Blazor.Diagrams.Core.Geometry;
+using Microsoft.JSInterop;
+using Moq;
+using System.Threading.Tasks;
+using Xunit;
+using JSRuntimeExtensions = Blazor.Diagrams.Extensions.JSRuntimeExtensions;
+
+namespace Blazor.Diagrams.Tests.Extensions
+{
+	public class JSRuntimeExtensionsTest
+	{
+		[Fact]
+		public async Task TestGetBoundingClientRectDoesNotThrowOnTimeout()
+		{
+			var jsRuntime = new Mock<IJSRuntime>();
+			jsRuntime.Setup(j => j.InvokeAsync<Rectangle>(It.IsAny<string>(), It.IsAny<object?[]?>())).ThrowsAsync(new TaskCanceledException());
+			var result = await JSRuntimeExtensions.GetBoundingClientRect(jsRuntime.Object, default);
+			Assert.Null(result);
+		}
+	}
+}