Possible fix when inapp theme is changed

samples/NotificationFlyoutSample/Shell.xaml

@@ -7,6 +7,11 @@
         Width="330"
         Height="500"
         Margin="24">
+        <ComboBox x:Name="Theme" SelectionChanged="Theme_SelectionChanged">
+            <ComboBoxItem Content="Default" />
+            <ComboBoxItem Content="Dark" />
+            <ComboBoxItem Content="Light" />
+        </ComboBox>
         <Button Margin="0,0,0,8" Content="Button" />
         <Slider Margin="0,0,0,8" />
         <TextBox Margin="0,0,0,8" />

samples/NotificationFlyoutSample/Shell.xaml.cs

@@ -1,27 +1,26 @@
-using System;
+namespace NotificationFlyoutSample
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Runtime.InteropServices.WindowsRuntime;
-using Windows.Foundation;
-using Windows.Foundation.Collections;
-using Windows.UI.Xaml;
-using Windows.UI.Xaml.Controls;
-using Windows.UI.Xaml.Controls.Primitives;
-using Windows.UI.Xaml.Data;
-using Windows.UI.Xaml.Input;
-using Windows.UI.Xaml.Media;
-using Windows.UI.Xaml.Navigation;
-
-// The User Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234236
-
-namespace NotificationFlyoutSample
 {
-    public sealed partial class Shell : UserControl
+    public sealed partial class Shell
     {
         public Shell()
         {
-            this.InitializeComponent();
+            InitializeComponent();
+        }
+
+        private void Theme_SelectionChanged(object sender, Windows.UI.Xaml.Controls.SelectionChangedEventArgs e)
+        {
+            switch (Theme.SelectedIndex)
+            {
+                case 0:
+                    RequestedTheme = Windows.UI.Xaml.ElementTheme.Default;
+                    break;
+                case 1:
+                    RequestedTheme = Windows.UI.Xaml.ElementTheme.Dark;
+                    break;
+                case 2:
+                    RequestedTheme = Windows.UI.Xaml.ElementTheme.Light;
+                    break;
+            }
         }
     }
 }

src/NotificationFlyout.Uwp.UI.Controls/NotificationFlyout.Uwp.UI.Controls.csproj

@@ -12,7 +12,7 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="NotificationFlyoutPresenter\NotificationFlyoutContentPresenter.xaml">
+    <Page Include="NotificationFlyoutPresenter\NotificationFlyoutPresenter.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>

src/NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutHost/NotificationFlyoutHost.xaml

@@ -54,14 +54,10 @@
                                                 FromVerticalOffset="0" />
                                         </TransitionCollection>
                                     </Grid.Transitions>
-                                    <controls:NotificationFlyoutContentPresenter Content="{TemplateBinding Content}" />
+                                    <controls:NotificationFlyoutPresenter Content="{TemplateBinding Content}" />
                                 </Grid>
                             </Flyout>
                         </FlyoutBase.AttachedFlyout>
-                        <Border
-                            Width="300"
-                            Height="400"
-                            Background="Blue" />
                         <VisualStateManager.VisualStateGroups>
                             <VisualStateGroup x:Name="PlacementStates">
                                 <VisualState x:Name="Bottom">

src/NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutContentPresenter.cs

@@ -1,12 +0,0 @@
-using Windows.UI.Xaml.Controls;
-
-namespace NotificationFlyout.Uwp.UI.Controls
-{
-    public class NotificationFlyoutContentPresenter : ContentControl
-    {
-        public NotificationFlyoutContentPresenter()
-        {
-            DefaultStyleKey = typeof(NotificationFlyoutContentPresenter);
-        }
-    }
-}

src/NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutPresenter.cs

@@ -0,0 +1,27 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Data;
+
+namespace NotificationFlyout.Uwp.UI.Controls
+{
+    public class NotificationFlyoutPresenter : ContentControl
+    {
+        public NotificationFlyoutPresenter()
+        {
+            DefaultStyleKey = typeof(NotificationFlyoutPresenter);
+        }
+
+        protected override void OnApplyTemplate()
+        {
+            if (GetTemplateChild("ContentPresenter") is ContentControl contentPresenter)
+            {
+                BindingOperations.SetBinding(this, RequestedThemeProperty, new Binding
+                {
+                    Source = contentPresenter.Content,
+                    Path = new PropertyPath(nameof(RequestedTheme)),
+                    Mode = BindingMode.TwoWay
+                });
+            }
+        }
+    }
+}

src/NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutPresenter.xaml

@@ -31,11 +31,11 @@
         FallbackColor="{StaticResource SystemAccentColorDark1}"
         TintColor="{StaticResource SystemAccentColorDark1}"
         TintOpacity="0.8" />
-    <Style TargetType="controls:NotificationFlyoutContentPresenter">
+    <Style TargetType="controls:NotificationFlyoutPresenter">
         <Setter Property="Background" Value="{ThemeResource NotificationFlyoutPresenterBackgroundBrush}" />
         <Setter Property="Template">
             <Setter.Value>
-                <ControlTemplate TargetType="controls:NotificationFlyoutContentPresenter">
+                <ControlTemplate TargetType="controls:NotificationFlyoutPresenter">
                     <Border
                         x:Name="Root"
                         Padding="{TemplateBinding Padding}"
@@ -52,7 +52,8 @@
                             VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
                             VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}"
                             ZoomMode="{TemplateBinding ScrollViewer.ZoomMode}">
-                            <ContentPresenter
+                            <ContentControl
+                                x:Name="ContentPresenter"
                                 Margin="{TemplateBinding Padding}"
                                 HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                 VerticalAlignment="{TemplateBinding VerticalContentAlignment}"

src/NotificationFlyout.Uwp.UI.Controls/Themes/Generic.xaml

@@ -1,7 +1,6 @@
-<ResourceDictionary
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
-    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
     <ResourceDictionary.MergedDictionaries>
         <ResourceDictionary Source="ms-appx:///NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutHost/NotificationFlyoutHost.xaml" />
-        <ResourceDictionary Source="ms-appx:///NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutContentPresenter.xaml" />
+        <ResourceDictionary Source="ms-appx:///NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutPresenter.xaml" />
     </ResourceDictionary.MergedDictionaries>
 </ResourceDictionary>

src/NotificationFlyout.Wpf.UI/Helpers/NotificationIconHelper.cs

@@ -21,7 +21,7 @@ namespace NotificationFlyout.Wpf.UI.Helpers
         {
             _windowHandle = window.GetHandle();
 
-            var source = HwndSource.FromHwnd(_windowHandle);
+            HwndSource source = HwndSource.FromHwnd(_windowHandle);
             source.AddHook(new HwndSourceHook(WndProc));
 
             CreateNotificationIcon();

src/NotificationFlyout.sln

@@ -44,8 +44,8 @@ Global
 		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|ARM.Build.0 = Release|Any CPU
 		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|ARM64.ActiveCfg = Release|Any CPU
 		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|ARM64.Build.0 = Release|Any CPU
-		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|x64.ActiveCfg = Release|Any CPU
+		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|x64.ActiveCfg = Release|x64
-		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|x64.Build.0 = Release|Any CPU
+		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|x64.Build.0 = Release|x64
 		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|x86.ActiveCfg = Release|Any CPU
 		{0A782234-DC9F-4C4A-8820-FC640B03D233}.Release|x86.Build.0 = Release|Any CPU
 		{9987B132-E42C-401A-9AD5-E62529FACA40}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
@@ -84,8 +84,8 @@ Global
 		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|ARM.Build.0 = Release|Any CPU
 		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|ARM64.ActiveCfg = Release|Any CPU
 		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|ARM64.Build.0 = Release|Any CPU
-		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|x64.ActiveCfg = Release|Any CPU
+		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|x64.ActiveCfg = Release|x64
-		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|x64.Build.0 = Release|Any CPU
+		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|x64.Build.0 = Release|x64
 		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|x86.ActiveCfg = Release|Any CPU
 		{29430194-7EDE-4C33-AF59-CE121F48F66E}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection