Added PointerPage

samples/ControlCatalog.NetCore/Program.cs

@@ -46,6 +46,7 @@ namespace ControlCatalog.NetCore
         public static AppBuilder BuildAvaloniaApp()
             => AppBuilder.Configure<App>()
                 .UsePlatformDetect()
+                .With(new X11PlatformOptions{EnableMultiTouch = true})
                 .UseSkia()
                 .UseReactiveUI();
 

samples/ControlCatalog/MainView.xaml

@@ -31,6 +31,7 @@
       <TabItem Header="Menu"><pages:MenuPage/></TabItem>
       <TabItem Header="Notifications"><pages:NotificationsPage/></TabItem>
 	  <TabItem Header="NumericUpDown"><pages:NumericUpDownPage/></TabItem>
+      <TabItem Header="Pointers (Touch)"><pages:PointersPage/></TabItem>
       <TabItem Header="ProgressBar"><pages:ProgressBarPage/></TabItem>
       <TabItem Header="RadioButton"><pages:RadioButtonPage/></TabItem>
       <TabItem Header="Slider"><pages:SliderPage/></TabItem>

samples/ControlCatalog/Pages/PointersPage.cs

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Media;
+using Avalonia.Media.Immutable;
+
+namespace ControlCatalog.Pages
+{
+    public class PointersPage : Control
+    {
+        class PointerInfo
+        {
+            public Point Point { get; set; }
+            public Color Color { get; set; }
+        }
+
+        private static Color[] AllColors = new[]
+        {
+            Colors.Aqua,
+            Colors.Beige, 
+            Colors.Chartreuse, 
+            Colors.Coral,
+            Colors.Fuchsia,
+            Colors.Crimson,
+            Colors.Lavender, 
+            Colors.Orange,
+            Colors.Orchid,
+            Colors.ForestGreen,
+            Colors.SteelBlue,
+            Colors.PapayaWhip,
+            Colors.PaleVioletRed,
+            Colors.Goldenrod,
+            Colors.Maroon,
+            Colors.Moccasin,
+            Colors.Navy,
+            Colors.Wheat,
+            Colors.Violet,
+            Colors.Sienna,
+            Colors.Indigo,
+            Colors.Honeydew
+        };
+        
+        private Dictionary<IPointer, PointerInfo> _pointers = new Dictionary<IPointer, PointerInfo>();
+
+        public PointersPage()
+        {
+            ClipToBounds = true;
+        }
+        
+        void UpdatePointer(PointerEventArgs e)
+        {
+            if (!_pointers.TryGetValue(e.Pointer, out var info))
+            {
+                var colors = AllColors.Except(_pointers.Values.Select(c => c.Color)).ToArray();
+                var color = colors[new Random().Next(0, colors.Length - 1)];
+                _pointers[e.Pointer] = info = new PointerInfo {Color = color};
+            }
+
+            info.Point = e.GetPosition(this);
+            InvalidateVisual();
+        }
+        
+        protected override void OnPointerPressed(PointerPressedEventArgs e)
+        {
+            UpdatePointer(e);
+            base.OnPointerPressed(e);
+        }
+
+        protected override void OnPointerMoved(PointerEventArgs e)
+        {
+            UpdatePointer(e);
+            base.OnPointerMoved(e);
+        }
+
+        protected override void OnPointerReleased(PointerReleasedEventArgs e)
+        {
+            _pointers.Remove(e.Pointer);
+            InvalidateVisual();
+        }
+
+        public override void Render(DrawingContext context)
+        {
+            context.FillRectangle(Brushes.Transparent, new Rect(default, Bounds.Size));
+            foreach (var pt in _pointers.Values)
+            {
+                var brush = new ImmutableSolidColorBrush(pt.Color);
+                context.DrawGeometry(brush, null, new EllipseGeometry(new Rect(pt.Point.X - 75, pt.Point.Y - 75,
+                    150, 150)));
+            }
+            
+        }
+    }
+}