Added benckmark samples

src/GraphicsControls.Sample.iOS/AppDelegate.cs

@@ -18,6 +18,7 @@ namespace GraphicsControls.Sample.iOS
         //
         public override bool FinishedLaunching(UIApplication app, NSDictionary options)
         {
+            Xamarin.Forms.FormsMaterial.Init();
             Xamarin.Forms.Forms.Init();
             LoadApplication(new App());
 

src/GraphicsControls.Sample.iOS/GraphicsControls.Sample.iOS.csproj

@@ -125,6 +125,9 @@
   <ItemGroup>
     <PackageReference Include="Xamarin.Forms" Version="4.8.0.1687" />
     <PackageReference Include="Xamarin.Essentials" Version="1.5.3.2" />
+    <PackageReference Include="Xamarin.Forms.Visual.Material">
+      <Version>4.8.0.1687</Version>
+    </PackageReference>
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\GraphicsControls.Sample\GraphicsControls.Sample.csproj">

src/GraphicsControls.Sample/App.xaml.cs

@@ -9,6 +9,7 @@ namespace GraphicsControls.Sample
             InitializeComponent();
 
             MainPage = new MainPage();
+            //MainPage = new NavigationPage(new BenchmarkPage());
         }
 
         protected override void OnStart()

src/GraphicsControls.Sample/Benchmark/BenchmarkPage.cs

@@ -0,0 +1,48 @@
+using System;
+using Xamarin.Forms;
+
+namespace GraphicsControls.Sample
+{
+    public static class BenchmarkSettings
+    {
+        public static int NumberOfViews { get; } = 10;
+    }
+
+    public class BenchmarkPage : ContentPage
+    {
+        public BenchmarkPage()
+        {
+            Title = "GraphicsControls Benchmark";
+
+            var layout = new StackLayout();
+
+            var nativeButton = new Button
+            {
+                Text = "Use Native Controls"
+            };
+
+            var drawnButton = new Button
+            {
+                Text = "Use Drawn Controls"
+            };
+
+            layout.Children.Add(nativeButton);
+            layout.Children.Add(drawnButton);
+
+            Content = layout;
+
+            nativeButton.Clicked += OnNativeButtonClicked;
+            drawnButton.Clicked += OnDrawnButtonClicked;
+        }
+
+        void OnNativeButtonClicked(object sender, EventArgs e)
+        {
+            Navigation.PushAsync(new NativeBenchmarkPage());
+        }
+
+        void OnDrawnButtonClicked(object sender, EventArgs e)
+        {
+            Navigation.PushAsync(new DrawnBenchmarkPage());
+        }
+    }
+}

src/GraphicsControls.Sample/Benchmark/DrawnBenchmarkPage.cs

@@ -0,0 +1,50 @@
+using System.Diagnostics;
+using Xamarin.Forms;
+
+namespace GraphicsControls.Sample
+{
+    public class DrawnBenchmarkPage : ContentPage
+    {
+        readonly Stopwatch _stopwatch;
+        readonly Label _infoLabel;
+
+        public DrawnBenchmarkPage()
+        {
+            Title = "Use Drawn Controls";
+
+            _stopwatch = new Stopwatch();
+            _stopwatch.Start();
+
+            var scrollView = new ScrollView();
+
+            var layout = new StackLayout();
+
+            _infoLabel = new Label
+            {
+                FontSize = 36,
+                HorizontalOptions = LayoutOptions.Center
+            };
+
+            layout.Children.Add(_infoLabel);
+
+            for (int i = 0; i < BenchmarkSettings.NumberOfViews; i++)
+            {
+                var drawnButton = new Button { VisualType = VisualType.Material, Text = $"Button {i + 1}" };
+                layout.Children.Add(drawnButton);
+            }
+
+            scrollView.Content = layout;
+
+            Content = scrollView;
+        }
+
+        protected override void OnAppearing()
+        {
+            base.OnAppearing();
+
+            _stopwatch.Stop();
+
+            _infoLabel.Text = $"{_stopwatch.ElapsedMilliseconds} ms";
+        }
+    }
+}

src/GraphicsControls.Sample/Benchmark/NativeBenchmarkPage.cs

@@ -0,0 +1,50 @@
+using System.Diagnostics;
+using Xamarin.Forms;
+
+namespace GraphicsControls.Sample
+{
+    public class NativeBenchmarkPage : ContentPage
+    {
+        readonly Stopwatch _stopwatch;
+        readonly Label _infoLabel;
+
+        public NativeBenchmarkPage()
+        {
+            Title = "Use Native Controls";
+
+            _stopwatch = new Stopwatch();
+            _stopwatch.Start();
+
+            var scrollView = new ScrollView();
+
+            var layout = new StackLayout();
+
+            _infoLabel = new Label
+            {
+                FontSize = 36,
+                HorizontalOptions = LayoutOptions.Center
+            };
+
+            layout.Children.Add(_infoLabel);
+
+            for (int i = 0; i < BenchmarkSettings.NumberOfViews; i++)
+            {
+                var drawnButton = new Xamarin.Forms.Button { Visual = VisualMarker.Material, Text = $"Button {i + 1}" };
+                layout.Children.Add(drawnButton);
+            }
+
+            scrollView.Content = layout;
+
+            Content = scrollView;
+        }
+
+        protected override void OnAppearing()
+        {
+            base.OnAppearing();
+
+            _stopwatch.Stop();
+
+            _infoLabel.Text = $"{_stopwatch.ElapsedMilliseconds} ms";
+        }
+    }
+}

src/GraphicsControls.Sample/GraphicsControls.Sample.csproj

@@ -17,4 +17,7 @@
   <ItemGroup>
     <ProjectReference Include="..\GraphicsControls\GraphicsControls.csproj" />
   </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Benchmark\" />
+  </ItemGroup>
 </Project>

src/GraphicsControls/Controls/Entry/Entry.shared.cs

@@ -29,7 +29,14 @@ namespace GraphicsControls
             Content = _entry;
         }
 
-        public static readonly BindableProperty TextProperty = InputElement.TextProperty;
+        public static readonly BindableProperty TextProperty =
+            BindableProperty.Create(nameof(IInput.Text), typeof(string), typeof(IInput), string.Empty,
+                propertyChanged: OnTextChanged);
+
+        static void OnTextChanged(BindableObject bindable, object oldValue, object newValue)
+        {
+            (bindable as Entry)?.UpdateText();
+        }
 
         public static readonly BindableProperty TextColorProperty =
             BindableProperty.Create(nameof(IInput.TextColor), typeof(XColor), typeof(IInput), XColor.Default,
@@ -109,6 +116,7 @@ namespace GraphicsControls
                 AnimateMaterialPlaceholder(IsFocused);
 
             UpdateEntryPosition();
+            UpdateText();
             UpdateTextColor();
             UpdateCharacterSpacing();
         }
@@ -278,6 +286,11 @@ namespace GraphicsControls
                 _entry.Text = string.Empty;
         }
 
+        void UpdateText()
+        {
+            _entry.Text = Text;
+        }
+
         void UpdateTextColor()
         {
             if (TextColor != XColor.Default)

src/GraphicsControls/Controls/GraphicsView.android.cs

@@ -29,7 +29,6 @@ namespace GraphicsControls.Android
             if (e.OldElement != null)
             {
                 e.OldElement.Invalidated -= OnDrawInvalidated;
-                SetNativeControl(null);
             }
 
             if (e.NewElement != null)

src/GraphicsControls/Controls/GraphicsView.ios.cs

@@ -33,7 +33,6 @@ namespace GraphicsControls.iOS
             if (e.OldElement != null)
             {
                 e.OldElement.Invalidated -= OnDrawInvalidated;
-                SetNativeControl(null);
             }
 
             if (e.NewElement != null)

src/GraphicsControls/Controls/GraphicsView.macos.cs

@@ -33,7 +33,6 @@ namespace GraphicsControls.Mac
             if (e.OldElement != null)
             {
                 e.OldElement.Invalidated -= OnDrawInvalidated;
-                SetNativeControl(null);
             }
 
             if (e.NewElement != null)