[Core] Support refreshing resourcesermau-refresh-resources

While most resource UIs have a popup or window that doesn't really
require a live refresh, the brush resource tab does have a persistent
list so it needs to be able to update. Since the view model is shared,
we get the former for free anyway.

2 files changed, 29 insertions, 0 deletions

diff --git a/Xamarin.PropertyEditing.Tests/BrushPropertyViewModelTests.cs b/Xamarin.PropertyEditing.Tests/BrushPropertyViewModelTests.cs
index bf4ccb3..ba0786f 100644
--- a/Xamarin.PropertyEditing.Tests/BrushPropertyViewModelTests.cs
+++ b/Xamarin.PropertyEditing.Tests/BrushPropertyViewModelTests.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Threading;
 using Moq;
 using NUnit.Framework;
 using Xamarin.PropertyEditing.Drawing;
@@ -52,5 +53,31 @@ namespace Xamarin.PropertyEditing.Tests
 			Assert.IsTrue (changed);
 			Assert.AreNotEqual (rs1, rs2);
 		}
+
+		[Test]
+		public void ResourcesChangedUpdatesResources ()
+		{
+			var mockProperty = new Mock<IPropertyInfo> ();
+			mockProperty.SetupGet (pi => pi.Type).Returns (typeof (CommonBrush));
+			var mockEditor = new MockObjectEditor (mockProperty.Object);
+
+			var resource1 = new Resource ("first");
+			var resources = new List<Resource> { resource1 };
+
+			var provider = new Mock<IResourceProvider>();
+			provider.Setup (p => p.GetResourceSourcesAsync (It.IsAny<object> ())).ReturnsAsync (new[] { MockResourceProvider.SystemResourcesSource });
+			provider.Setup (p => p.GetResourcesAsync (It.IsAny<object> (), mockProperty.Object, CancellationToken.None)).ReturnsAsync (resources);
+
+			var vm = new BrushPropertyViewModel (new TargetPlatform (new MockEditorProvider(), provider.Object), mockProperty.Object, new [] { mockEditor });
+			
+			Assume.That (vm.ResourceSelector.Resources, Contains.Item (resource1));
+
+			var resource2 = new Resource ("second");
+			resources.Add (resource2);
+
+			provider.Raise (rp => rp.ResourcesChanged += null, new ResourcesChangedEventArgs());
+			Assert.That (vm.ResourceSelector.Resources, Contains.Item (resource1));
+			Assert.That (vm.ResourceSelector.Resources, Contains.Item (resource2));
+		}
 	}
 }
diff --git a/Xamarin.PropertyEditing.Tests/MockControls/MockResourceProvider.cs b/Xamarin.PropertyEditing.Tests/MockControls/MockResourceProvider.cs
index 8d5e458..f502626 100644
--- a/Xamarin.PropertyEditing.Tests/MockControls/MockResourceProvider.cs
+++ b/Xamarin.PropertyEditing.Tests/MockControls/MockResourceProvider.cs
@@ -11,6 +11,8 @@ namespace Xamarin.PropertyEditing.Tests
 	public class MockResourceProvider
 		: IResourceProvider
 	{
+		public event EventHandler<ResourcesChangedEventArgs> ResourcesChanged;
+
 		public bool CanCreateResources => true;
 
 		public Task<ResourceCreateError> CheckNameErrorsAsync (object target, ResourceSource source, string name)