From b9effb88c8be4021a716079e8cf15d3cdb9af8ed Mon Sep 17 00:00:00 2001
From: Nigel Sampson <nigel.sampson@pushpay.com>
Date: Mon, 15 Jul 2019 15:34:34 +1200
Subject: [PATCH] #407 Add PropertyChangeNotificationsOnUIThread

---
 src/Caliburn.Micro.Core/DefaultPlatformProvider.cs          | 5 +++++
 src/Caliburn.Micro.Core/IPlatformProvider.cs                | 5 +++++
 .../Platforms/Android/AndroidPlatformProvider.cs            | 6 +++++-
 .../Platforms/Xamarin.Forms/FormsPlatformProvider.cs        | 5 +++++
 .../Platforms/iOS/iOSPlatformProvider.cs                    | 5 +++++
 src/Caliburn.Micro.Platform/XamlPlatformProvider.cs         | 5 +++++
 6 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/Caliburn.Micro.Core/DefaultPlatformProvider.cs b/src/Caliburn.Micro.Core/DefaultPlatformProvider.cs
index 09bff6b8..de6d215a 100644
--- a/src/Caliburn.Micro.Core/DefaultPlatformProvider.cs
+++ b/src/Caliburn.Micro.Core/DefaultPlatformProvider.cs
@@ -46,6 +46,11 @@ public virtual void OnUIThread(Action action)
             action();
         }
 
+        /// <summary>
+        /// Whether or not classes should execute property change notications on the UI thread.
+        /// </summary>
+        public virtual bool PropertyChangeNotificationsOnUIThread => true;
+
         /// <summary>
         /// Used to retrieve the root, non-framework-created view.
         /// </summary>
diff --git a/src/Caliburn.Micro.Core/IPlatformProvider.cs b/src/Caliburn.Micro.Core/IPlatformProvider.cs
index 3795bc65..e314efc9 100644
--- a/src/Caliburn.Micro.Core/IPlatformProvider.cs
+++ b/src/Caliburn.Micro.Core/IPlatformProvider.cs
@@ -15,6 +15,11 @@ public interface IPlatformProvider
         /// </summary>
         bool InDesignMode { get; }
 
+        /// <summary>
+        /// Whether or not classes should execute property change notications on the UI thread.
+        /// </summary>
+        bool PropertyChangeNotificationsOnUIThread { get; }
+
         /// <summary>
         ///   Executes the action on the UI thread asynchronously.
         /// </summary>
diff --git a/src/Caliburn.Micro.Platform/Platforms/Android/AndroidPlatformProvider.cs b/src/Caliburn.Micro.Platform/Platforms/Android/AndroidPlatformProvider.cs
index 62247046..53d6e7f4 100644
--- a/src/Caliburn.Micro.Platform/Platforms/Android/AndroidPlatformProvider.cs
+++ b/src/Caliburn.Micro.Platform/Platforms/Android/AndroidPlatformProvider.cs
@@ -20,7 +20,11 @@ public class AndroidPlatformProvider : IPlatformProvider
         public AndroidPlatformProvider(Application application) {
             application.RegisterActivityLifecycleCallbacks(lifecycleHandler);
         }
-        
+
+        /// <summary>
+        /// Whether or not classes should execute property change notications on the UI thread.
+        /// </summary>
+        public virtual bool PropertyChangeNotificationsOnUIThread => true;
 
         private bool CheckAccess() {
             return SynchronizationContext.Current != null;
diff --git a/src/Caliburn.Micro.Platform/Platforms/Xamarin.Forms/FormsPlatformProvider.cs b/src/Caliburn.Micro.Platform/Platforms/Xamarin.Forms/FormsPlatformProvider.cs
index 32492df0..1b93bae6 100644
--- a/src/Caliburn.Micro.Platform/Platforms/Xamarin.Forms/FormsPlatformProvider.cs
+++ b/src/Caliburn.Micro.Platform/Platforms/Xamarin.Forms/FormsPlatformProvider.cs
@@ -24,6 +24,11 @@ public FormsPlatformProvider(IPlatformProvider platformProvider) {
         /// <inheritdoc />
         public virtual bool InDesignMode => platformProvider.InDesignMode;
 
+        /// <summary>
+        /// Whether or not classes should execute property change notications on the UI thread.
+        /// </summary>
+        public virtual bool PropertyChangeNotificationsOnUIThread => platformProvider.PropertyChangeNotificationsOnUIThread;
+
         /// <inheritdoc />
         public virtual void BeginOnUIThread(System.Action action) => platformProvider.BeginOnUIThread(action);
 
diff --git a/src/Caliburn.Micro.Platform/Platforms/iOS/iOSPlatformProvider.cs b/src/Caliburn.Micro.Platform/Platforms/iOS/iOSPlatformProvider.cs
index 776c0dac..589b3615 100644
--- a/src/Caliburn.Micro.Platform/Platforms/iOS/iOSPlatformProvider.cs
+++ b/src/Caliburn.Micro.Platform/Platforms/iOS/iOSPlatformProvider.cs
@@ -24,6 +24,11 @@ public virtual bool InDesignMode
             get { return false; }
         }
 
+        /// <summary>
+        /// Whether or not classes should execute property change notications on the UI thread.
+        /// </summary>
+        public virtual bool PropertyChangeNotificationsOnUIThread => true;
+
         /// <summary>
         ///   Executes the action on the UI thread asynchronously.
         /// </summary>
diff --git a/src/Caliburn.Micro.Platform/XamlPlatformProvider.cs b/src/Caliburn.Micro.Platform/XamlPlatformProvider.cs
index e4c0aa1b..4b3c7c37 100644
--- a/src/Caliburn.Micro.Platform/XamlPlatformProvider.cs
+++ b/src/Caliburn.Micro.Platform/XamlPlatformProvider.cs
@@ -33,6 +33,11 @@ public XamlPlatformProvider() {
 #endif
         }
 
+        /// <summary>
+        /// Whether or not classes should execute property change notications on the UI thread.
+        /// </summary>
+        public virtual bool PropertyChangeNotificationsOnUIThread => true;
+
         /// <summary>
         /// Indicates whether or not the framework is in design-time mode.
         /// </summary>