Added ContextMenu/Flyout animations. Added platform services. Use bitmap cache for all views.

Harmonia.UI/Animations/Animations.cs

@@ -0,0 +1,58 @@
+using Avalonia;
+using Avalonia.Animation;
+using Avalonia.Media;
+using Avalonia.Styling;
+using System;
+
+namespace Harmonia.UI.Animations
+{
+    public static class Animations
+    {
+        public static Animation SlideIn(Point start, Point end, long duration = 200)
+        {
+            return new()
+            {
+                Duration = TimeSpan.FromMilliseconds(duration),
+                Children =
+                {
+                    new KeyFrame
+                    {
+                        Cue = new Cue(0f),
+                        Setters =
+                        {
+                            new Setter(Visual.OpacityProperty, 0.0),
+                            new Setter(TranslateTransform.XProperty, start.X),
+                            new Setter(TranslateTransform.YProperty, start.Y)
+                        }
+                    },
+                    new KeyFrame
+                    {
+                        Cue = new Cue(1f),
+                        Setters =
+                        {
+                            new Setter(Visual.OpacityProperty, 1.0),
+                            new Setter(TranslateTransform.XProperty, end.X),
+                            new Setter(TranslateTransform.YProperty, end.Y)
+                        }
+                    }
+                }
+            };
+        }
+
+        public static Animation SlideFromRight(double offSet, long duration = 200)
+        {
+            Point start = new(-offSet, 0);
+            Point end = new(0, 0);
+
+            return SlideIn(start, end, duration);
+        }
+
+        public static Animation SlideToRight(double offSet, long duration = 200)
+        {
+            Point start = new(0, 0);
+            Point end = new(offSet, 0);
+
+            return SlideIn(start, end, duration);
+        }
+    }
+}