Add ActivityIndicator component

src/Blaxamarin.Framework/Elements/ActivityIndicator.cs

@@ -0,0 +1,33 @@
+using Blaxamarin.Framework.Elements.Handlers;
+using Emblazon;
+using Microsoft.AspNetCore.Components;
+using XF = Xamarin.Forms;
+
+namespace Blaxamarin.Framework.Elements
+{
+    public class ActivityIndicator : View
+    {
+        static ActivityIndicator()
+        {
+            ElementHandlerRegistry
+                .RegisterElementHandler<ActivityIndicator>(renderer => new ActivityIndicatorHandler(renderer, new XF.ActivityIndicator()));
+        }
+
+        [Parameter] public bool? IsRunning { get; set; }
+        [Parameter] public XF.Color? Color { get; set; }
+
+        protected override void RenderAttributes(AttributesBuilder builder)
+        {
+            base.RenderAttributes(builder);
+
+            if (IsRunning != null)
+            {
+                builder.AddAttribute(nameof(IsRunning), IsRunning.Value);
+            }
+            if (Color != null)
+            {
+                builder.AddAttribute(nameof(Color), AttributeHelper.ColorToString(Color.Value));
+            }
+        }
+    }
+}

src/Blaxamarin.Framework/Elements/Handlers/ActivityIndicatorHandler.cs

@@ -0,0 +1,32 @@
+using Emblazon;
+using System;
+using XF = Xamarin.Forms;
+
+namespace Blaxamarin.Framework.Elements.Handlers
+{
+    public class ActivityIndicatorHandler : ViewHandler
+    {
+        public ActivityIndicatorHandler(EmblazonRenderer renderer, XF.ActivityIndicator activityIndicatorControl) : base(renderer, activityIndicatorControl)
+        {
+            ActivityIndicatorControl = activityIndicatorControl ?? throw new ArgumentNullException(nameof(activityIndicatorControl));
+        }
+
+        public XF.ActivityIndicator ActivityIndicatorControl { get; }
+
+        public override void ApplyAttribute(ulong attributeEventHandlerId, string attributeName, object attributeValue, string attributeEventUpdatesAttributeName)
+        {
+            switch (attributeName)
+            {
+                case nameof(ActivityIndicator.IsRunning):
+                    ActivityIndicatorControl.IsRunning = (bool)(attributeValue ?? (bool)XF.ActivityIndicator.IsRunningProperty.DefaultValue);
+                    break;
+                case nameof(ActivityIndicator.Color):
+                    ActivityIndicatorControl.Color = AttributeHelper.StringToColor((string)attributeValue);
+                    break;
+                default:
+                    base.ApplyAttribute(attributeEventHandlerId, attributeName, attributeValue, attributeEventUpdatesAttributeName);
+                    break;
+            }
+        }
+    }
+}