[Core] Add ICompleteValues

This is the most basic version of this to support the status quo for
Android. The hard part is really the UI, so this will get us a
significant part of the way towards a more robust version.

2 files changed, 31 insertions, 4 deletions

diff --git a/Xamarin.PropertyEditing.Tests/MockEditorProvider.cs b/Xamarin.PropertyEditing.Tests/MockEditorProvider.cs
index 2225bca..dee6c71 100644
--- a/Xamarin.PropertyEditing.Tests/MockEditorProvider.cs
+++ b/Xamarin.PropertyEditing.Tests/MockEditorProvider.cs
@@ -13,8 +13,9 @@ namespace Xamarin.PropertyEditing.Tests
 	{
 		public static readonly TargetPlatform MockPlatform = new TargetPlatform (new MockEditorProvider ());
 
-		public MockEditorProvider ()
+		public MockEditorProvider (IResourceProvider resources = null)
 		{
+			this.resources = resources;
 		}
 
 		public MockEditorProvider (IObjectEditor editor)
@@ -70,9 +71,9 @@ namespace Xamarin.PropertyEditing.Tests
 		{
 			switch (item) {
 			case MockWpfControl msc:
-				return new MockObjectEditor (msc);
+				return new MockObjectEditor (msc) { Resources = this.resources };
 			case MockControl mc:
-				return new MockNameableEditor (mc);
+				return new MockNameableEditor (mc) { Resources = this.resources };
 			case MockBinding mb:
 				return new MockBindingEditor (mb);
 			default:
@@ -99,6 +100,7 @@ namespace Xamarin.PropertyEditing.Tests
 			return Task.FromResult<IReadOnlyDictionary<Type, ITypeInfo>> (new Dictionary<Type, ITypeInfo> ());
 		}
 
+		private readonly IResourceProvider resources;
 		private readonly Dictionary<object, IObjectEditor> editorCache = new Dictionary<object, IObjectEditor> ();
 	}
 }
\ No newline at end of file
diff --git a/Xamarin.PropertyEditing.Tests/MockObjectEditor.cs b/Xamarin.PropertyEditing.Tests/MockObjectEditor.cs
index 80f11c0..3adb37e 100644
--- a/Xamarin.PropertyEditing.Tests/MockObjectEditor.cs
+++ b/Xamarin.PropertyEditing.Tests/MockObjectEditor.cs
@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
 using System.Reflection;
+using System.Threading;
 using System.Threading.Tasks;
 using Xamarin.PropertyEditing.Reflection;
 using Xamarin.PropertyEditing.Tests.MockControls;
@@ -29,7 +30,7 @@ namespace Xamarin.PropertyEditing.Tests
 	}
 
 	internal class MockObjectEditor
-		: IObjectEditor, IObjectEventEditor
+		: IObjectEditor, IObjectEventEditor, ICompleteValues
 	{
 		public MockObjectEditor ()
 		{
@@ -111,6 +112,12 @@ namespace Xamarin.PropertyEditing.Tests
 			set;
 		}
 
+		public IResourceProvider Resources
+		{
+			get;
+			set;
+		}
+
 		public void ChangeAllProperties ()
 		{
 			PropertyChanged?.Invoke (this, new EditorPropertyChangedEventArgs (null));
@@ -332,6 +339,24 @@ namespace Xamarin.PropertyEditing.Tests
 			return Task.FromResult<ITypeInfo> (new TypeInfo (asm, type.Namespace, type.Name));
 		}
 
+		public bool CanAutocomplete (string input)
+		{
+			return (input != null && input.Trim ().StartsWith ("@"));
+		}
+
+		public async Task<IReadOnlyList<string>> GetCompletionsAsync (IPropertyInfo property, string input, CancellationToken cancellationToken)
+		{
+			if (Resources == null)
+				return Array.Empty<string> ();
+
+			input = input.Trim ().TrimStart('@');
+			var resources = await Resources.GetResourcesAsync (Target, property, cancellationToken);
+			return resources.Where (r =>
+					r.Name.IndexOf (input, StringComparison.OrdinalIgnoreCase) != -1
+					&& r.Name.Length > input.Length) // Skip exact matches
+				.Select (r => "@" + r.Name).ToList ();
+		}
+
 		internal readonly IDictionary<IPropertyInfo, object> values = new Dictionary<IPropertyInfo, object> ();
 		internal readonly IDictionary<IEventInfo, string> events = new Dictionary<IEventInfo, string> ();
 		internal readonly IReadOnlyDictionary<IPropertyInfo, IReadOnlyList<ITypeInfo>> assignableTypes;