Update MediaElement Transport Controls for Windows

src/CommunityToolkit.Maui.MediaElement/CommunityToolkit.Maui.MediaElement.csproj

@@ -81,4 +81,9 @@
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" Condition=" '$(Configuration)'=='Release' " PrivateAssets="All" />
   </ItemGroup>
 
+  <ItemGroup>
+    <EmbeddedResource Include="ResourceDictionary.windows.xaml">
+      <LogicalName>ResourceDictionary.windows.xaml</LogicalName>
+    </EmbeddedResource>
+  </ItemGroup>
 </Project>

src/CommunityToolkit.Maui.MediaElement/Primitives/CustomTransportControls.windows.cs

@@ -0,0 +1,43 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+namespace CommunityToolkit.Maui.Primitives;
+
+sealed partial class CustomTransportControls : MediaTransportControls
+{
+	public event EventHandler<EventArgs>? OnTemplateLoaded;
+	public AppBarButton FullScreenButton = new();
+	bool isFullScreen = false;
+
+	public CustomTransportControls()
+	{
+		this.DefaultStyleKey = typeof(CustomTransportControls);
+	}
+
+	protected override void OnApplyTemplate()
+	{
+		base.OnApplyTemplate();
+
+		var temp = GetTemplateChild("FullWindowButton") as AppBarButton;
+		if(temp is not null)
+		{
+			FullScreenButton = temp;
+			FullScreenButton.Visibility = Microsoft.UI.Xaml.Visibility.Visible;
+			OnTemplateLoaded?.Invoke(this, EventArgs.Empty);
+			FullScreenButton.Click += FullScreenButton_Click;
+		}
+	}
+
+	void FullScreenButton_Click(object sender, RoutedEventArgs e)
+	{
+		if (isFullScreen)
+		{
+			FullScreenButton.Icon = new FontIcon { Glyph = "\uE740" };
+			isFullScreen = false;
+		}
+		else
+		{
+			FullScreenButton.Icon = new SymbolIcon(Symbol.BackToWindow);
+			isFullScreen = true;
+		}
+	}
+}