More syntax rework

samples/RenderTest/Pages/AnimationsPage.xaml

@@ -40,81 +40,25 @@
         <Setter Property="Height" Value="100"/>
         <Setter Property="Child" Value="{StaticResource Acorn}"/>
       </Style>
-      <Style Selector="Border.Rect1:pointerover">
+      <Style Selector="Border.Rect1">
         <Style.Animations>
           <Animation Duration="0:0:2.5" 
                      RepeatBehavior="Repeat"
-                     RepeatCount="4" FillMode="None" PlaybackDirection="AlternateReverse" Easing="SineEaseInOut">
-            <TransformKeyFrames Property="RotateTransform.Angle">
-              <KeyFrame Cue="0%" Value="0"/>
-              <KeyFrame Cue="100%" Value="0"/>
-              <KeyFrame Cue="20%" Value="45"/>
-              <KeyFrame Cue="80%" Value="120"/>
-            </TransformKeyFrames>
-            <TransformKeyFrames Property="ScaleTransform.ScaleX">
-              <KeyFrame Cue="0%" Value="1"/>
-              <KeyFrame Cue="50%" Value="1.5"/>
-              <KeyFrame Cue="100%" Value="1"/>
-            </TransformKeyFrames>
+                     RepeatCount="4" FillMode="None"
+                     PlaybackDirection="AlternateReverse"
+                     Easing="SineEaseInOut">
+            <KeyFrame Cue="0%">
+              <DoubleSetter Property="Opacity" Value="0"/>
+            </KeyFrame> 
+            <KeyFrame Cue="0%">
+              <TransformSetter Property="RotateTransform.Angle" Value="360"/>
+            </KeyFrame> 
+            <KeyFrame Cue="100%">
+              <DoubleSetter Property="Opacity" Value="1"/>
+            </KeyFrame> 
           </Animation>
         </Style.Animations>
-      </Style>
-      <Style Selector="Border.Rect2:pointerover">
-        <Style.Animations>
-          <Animation Duration="0:0:0.5" Easing="SineEaseInOut">
-            <TransformKeyFrames Property="ScaleTransform.ScaleX">
-              <KeyFrame Cue="0%" Value="1"/>
-              <KeyFrame Cue="50%" Value="0.8"/>
-              <KeyFrame Cue="100%" Value="1"/>
-            </TransformKeyFrames>
-            <TransformKeyFrames Property="ScaleTransform.ScaleY">
-              <KeyFrame Cue="0%" Value="1"/>
-              <KeyFrame Cue="50%" Value="0.8"/>
-              <KeyFrame Cue="100%" Value="1"/>
-            </TransformKeyFrames>
-          </Animation>
-        </Style.Animations>
-      </Style>
-      <Style Selector="Border.Rect3">
-        <Setter Property="Child" Value="{StaticResource Heart}"/>
-        <Style.Animations>
-          <Animation Duration="0:0:0.5" Easing="QuadraticEaseInOut" RepeatBehavior="Loop">
-            <TransformKeyFrames Property="ScaleTransform.ScaleX">
-              <KeyFrame Cue="0%" Value="1"/>
-              <KeyFrame Cue="50%" Value="0.8"/>
-              <KeyFrame Cue="100%" Value="1"/>
-            </TransformKeyFrames>
-            <TransformKeyFrames Property="ScaleTransform.ScaleY">
-              <KeyFrame Cue="0%" Value="1"/>
-              <KeyFrame Cue="50%" Value="0.8"/>
-              <KeyFrame Cue="100%" Value="1"/>
-            </TransformKeyFrames>
-          </Animation>
-        </Style.Animations>
-      </Style>
-      <Style Selector="Border.Rect4:pointerover">
-        <Style.Animations>
-          <Animation Duration="0:0:3" Easing="BounceEaseInOut">
-            <TransformKeyFrames Property="TranslateTransform.Y">
-              <KeyFrame Cue="0%" Value="0"/>
-              <KeyFrame Cue="48%" Value="-100"/>
-              <KeyFrame Cue="100%" Value="0"/>
-            </TransformKeyFrames>
-          </Animation>
-        </Style.Animations>
-      </Style>
-      <Style Selector="Border.Rect5:pointerover">
-        <Style.Animations>
-          <Animation Duration="0:0:3" Easing="CircularEaseInOut">
-            <TransformKeyFrames Property="SkewTransform.AngleX">
-              <KeyFrame Cue="0%" Value="0"/>
-              <KeyFrame Cue="25%" Value="-20"/>
-              <KeyFrame Cue="75%" Value="20"/>
-              <KeyFrame Cue="100%" Value="0"/>
-            </TransformKeyFrames>
-          </Animation>
-        </Style.Animations>
-      </Style>
+      </Style> 
     </Styles>
   </UserControl.Styles>
   <Grid>

samples/RenderTest/Pages/ClippingPage.xaml

@@ -7,14 +7,14 @@
           <Setter Property="Border.Background" Value="Crimson"/>   
         </Style>
         <Style Selector="Border#clipChild">
-          <Style.Animations>
+          <!-- <Style.Animations>
             <Animation Duration="0:0:2" RepeatBehavior="Loop">
               <TransformKeyFrames Property="RotateTransform.Angle">
                 <KeyFrame Cue="0%" Value="0"/>
                 <KeyFrame Cue="100%" Value="360"/>
               </TransformKeyFrames>
             </Animation>
-          </Style.Animations>
+          </Style.Animations> -->
         </Style>
       </Styles>
     </Grid.Styles>

src/Avalonia.Animation/Animation.cs

@@ -8,14 +8,18 @@ using Avalonia.Metadata;
 using System;
 using System.Collections.Generic;
 using System.Collections.Specialized;
+using System.Reflection;
+using System.Linq;
 
 namespace Avalonia.Animation
 {
     /// <summary>
     /// Tracks the progress of an animation.
     /// </summary>
-    public class Animation : IDisposable, IAnimation
+    public class Animation : AvaloniaList<KeyFrame>, IDisposable, IAnimation
     {
+
+        private bool _isChildrenChanged = false;
         private List<IDisposable> _subscription = new List<IDisposable>();
         public AvaloniaList<IAnimator> _animators { get; set; } = new AvaloniaList<IAnimator>();
 
@@ -54,23 +58,44 @@ namespace Avalonia.Animation
         /// </summary> 
         public Easing Easing { get; set; } = new LinearEasing();
 
-        /// <summary>
-        /// A list of <see cref="KeyFrame"/> objects.
-        /// </summary>
-        [Content]
-        public AvaloniaList<KeyFrame> Children { get; set; } = new AvaloniaList<KeyFrame>();
 
         public Animation()
         {
-            InterpretKeyframes();
+            this.CollectionChanged += delegate { _isChildrenChanged = true; };
+        }
+
+        public Animation(IEnumerable<KeyFrame> items) : base(items)
+        {
+            this.CollectionChanged += delegate { _isChildrenChanged = true; };
+        }
+
+        public Animation(params KeyFrame[] items) : base(items)
+        {
+            this.CollectionChanged += delegate { _isChildrenChanged = true; };
         }
 
         private void InterpretKeyframes()
         {
-            foreach (var keyframe in Children)
+            var handlerList = new List<Type>();
+
+            foreach (var keyframe in this)
             {
-                
+                foreach (var setter in keyframe)
+                {
+
+                    var custAttr = setter.GetType()
+                                         .GetCustomAttributes()
+                                         .Where(p => p.GetType() == typeof(AnimatorAttribute));
+
+                    if (!custAttr.Any())
+                        throw new InvalidProgramException($"Type {setter.GetType()} doesn't have Animator attribute.");
+
+                    var match = (AnimatorAttribute)custAttr.First();
+                    if (!handlerList.Contains(match.HandlerType))
+                        handlerList.Add(match.HandlerType);
+                }
             }
+
         }
 
         /// <summary>
@@ -87,6 +112,12 @@ namespace Avalonia.Animation
         /// <inheritdocs/>
         public IDisposable Apply(Animatable control, IObservable<bool> matchObs)
         {
+            if (_isChildrenChanged)
+            {
+                InterpretKeyframes();
+                _isChildrenChanged = false;
+            }
+
             foreach (IAnimator keyframes in _animators)
             {
                 _subscription.Add(keyframes.Apply(this, control, matchObs));

src/Avalonia.Animation/Animator`1.cs

@@ -14,7 +14,7 @@ namespace Avalonia.Animation
     /// <summary>
     /// Base class for KeyFrames objects
     /// </summary>
-    public abstract class Animator<T> : AvaloniaList<KeyFrame>, IAnimator
+    public abstract class Animator<T> : AvaloniaList<InternalKeyFrame>, IAnimator
     {
         /// <summary>
         /// List of type-converted keyframes.
@@ -117,7 +117,7 @@ namespace Avalonia.Animation
         {
             var typeConv = TypeDescriptor.GetConverter(type);
 
-            foreach (KeyFrame k in this)
+            foreach (InternalKeyFrame k in this)
             {
                 if (k.Value == null)
                 {

src/Avalonia.Animation/IAnimationSetter.cs

@@ -4,6 +4,5 @@ namespace Avalonia.Animation
     {
         AvaloniaProperty Property { get; set; }
         object Value { get; set; }
-
     }
 }

src/Avalonia.Animation/KeyFrame.cs

@@ -12,12 +12,24 @@ namespace Avalonia.Animation
     /// Stores data regarding a specific key
     /// point and value in an animation.
     /// </summary>
-    public class KeyFrame
+    public class KeyFrame : AvaloniaList<IAnimationSetter>
     {
         internal bool timeSpanSet, cueSet;
         private TimeSpan _ktimeSpan;
         private Cue _kCue;
 
+        public KeyFrame()
+        {
+        }
+
+        public KeyFrame(IEnumerable<IAnimationSetter> items) : base(items)
+        {
+        }
+
+        public KeyFrame(params IAnimationSetter[] items) : base(items)
+        {
+        }
+
         /// <summary>
         /// Gets or sets the key time of this <see cref="KeyFrame"/>.
         /// </summary>
@@ -60,13 +72,15 @@ namespace Avalonia.Animation
             }
         }
 
-        /// <summary>
-        /// The keyframe's target value.
-        /// </summary>
-        public object Value { get; set; }
 
-        [Content]
-        public AvaloniaList<IAnimationSetter> Children { get; set; } = new AvaloniaList<IAnimationSetter>();
+    }
 
+    public class InternalKeyFrame
+    {
+        public Cue Cue { get; set; }
+        public TimeSpan KeyTime { get; set; }
+        internal bool timeSpanSet, cueSet;
+        public object Value { get; set; }
     }
+
 }

src/Avalonia.Visuals/Animation/TransformAnimator.cs

@@ -84,7 +84,7 @@ namespace Avalonia.Animation
         {
             childKeyFrames = new DoubleAnimator();
 
-            foreach (KeyFrame keyframe in this)
+            foreach (InternalKeyFrame keyframe in this)
             {
                 childKeyFrames.Add(keyframe);
             }

src/Avalonia.Visuals/Animation/TransformSetter.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Linq;
+using System.Reactive.Linq;
+using System.Diagnostics;
+using Avalonia.Animation.Utils;
+using Avalonia.Data;
+
+namespace Avalonia.Animation
+{
+    [Animator(typeof(TransformAnimator))]
+    public class TransformSetter : Setter
+    { 
+        
+    }
+}