Data bindings - Rework internals to support more situations

src/Artemis.Core/DefaultTypes/DataBindings/Converters/FloatDataBindingConverter.cs

@@ -36,9 +36,6 @@ namespace Artemis.Core
         /// <inheritdoc />
         public override void ApplyValue(float value)
         {
-            if (ValueTypeSetExpression == null)
-                return;
-
             if (DataBinding!.LayerProperty.PropertyDescription.MaxInputValue is float max)
                 value = Math.Min(value, max);
             if (DataBinding!.LayerProperty.PropertyDescription.MinInputValue is float min)

src/Artemis.Core/DefaultTypes/Properties/BoolLayerProperty.cs

@@ -6,7 +6,7 @@
         internal BoolLayerProperty()
         {
             KeyframesSupported = false;
-            RegisterDataBindingProperty(b => b, new GeneralDataBindingConverter<bool>());
+            RegisterDataBindingProperty(value => value, (_, newValue) => CurrentValue = newValue, new GeneralDataBindingConverter<bool>(), "Value");
         }
 
         /// <summary>

src/Artemis.Core/DefaultTypes/Properties/ColorGradientLayerProperty.cs

@@ -1,4 +1,6 @@
-namespace Artemis.Core
+using SkiaSharp;
+
+namespace Artemis.Core
 {
     /// <inheritdoc />
     public class ColorGradientLayerProperty : LayerProperty<ColorGradient>
@@ -6,12 +8,33 @@
         internal ColorGradientLayerProperty()
         {
             KeyframesSupported = false;
-            DataBindingsSupported = false;
+            DataBindingsSupported = true;
             DefaultValue = new ColorGradient();
-            
+
             CurrentValueSet += OnCurrentValueSet;
         }
 
+        private void CreateDataBindingRegistrations()
+        {
+            ClearDataBindingProperties();
+            if (CurrentValue == null)
+                return;
+
+            for (int index = 0; index < CurrentValue.Stops.Count; index++)
+            {
+                int stopIndex = index;
+                DataBindingRegistration<ColorGradient, SKColor> registerDataBindingProperty = RegisterDataBindingProperty(
+                    gradient => gradient.Stops[stopIndex].Color,
+                    (gradient, value) => gradient.Stops[stopIndex].Color = value,
+                    new ColorStopDataBindingConverter(),
+                    $"Color #{stopIndex + 1}"
+                );
+
+                registerDataBindingProperty.DisplayName = $"Color #{stopIndex + 1}";
+            }
+        }
+
+
         /// <summary>
         ///     Implicitly converts an <see cref="ColorGradientLayerProperty" /> to a <see cref="ColorGradient" />
         /// </summary>
@@ -31,6 +54,8 @@
             // Don't allow color gradients to be null
             if (BaseValue == null)
                 BaseValue = DefaultValue ?? new ColorGradient();
+
+            CreateDataBindingRegistrations();
         }
 
         #region Overrides of LayerProperty<ColorGradient>
@@ -41,10 +66,31 @@
             // Don't allow color gradients to be null
             if (BaseValue == null)
                 BaseValue = DefaultValue ?? new ColorGradient();
-            
+
             base.OnInitialize();
         }
 
         #endregion
     }
+
+    internal class ColorStopDataBindingConverter : DataBindingConverter<ColorGradient, SKColor>
+    {
+        public ColorStopDataBindingConverter()
+        {
+            SupportsInterpolate = true;
+            SupportsSum = true;
+        }
+
+        /// <inheritdoc />
+        public override SKColor Sum(SKColor a, SKColor b)
+        {
+            return a.Sum(b);
+        }
+
+        /// <inheritdoc />
+        public override SKColor Interpolate(SKColor a, SKColor b, double progress)
+        {
+            return a.Interpolate(b, (float) progress);
+        }
+    }
 }

src/Artemis.Core/DefaultTypes/Properties/FloatLayerProperty.cs

@@ -5,7 +5,7 @@
     {
         internal FloatLayerProperty()
         {
-            RegisterDataBindingProperty(value => value, new FloatDataBindingConverter());
+            RegisterDataBindingProperty(value => value, (_, newValue) => CurrentValue = newValue, new FloatDataBindingConverter(), "Value");
         }
 
         /// <summary>

src/Artemis.Core/DefaultTypes/Properties/FloatRangeLayerProperty.cs

@@ -5,9 +5,9 @@
     {
         internal FloatRangeLayerProperty()
         {
-            RegisterDataBindingProperty(range => range.Start, new FloatDataBindingConverter<FloatRange>());
+            RegisterDataBindingProperty(value => value.Start, (value, newValue) => value.Start = newValue, new FloatDataBindingConverter<FloatRange>(), "Start");
-            RegisterDataBindingProperty(range => range.End, new FloatDataBindingConverter<FloatRange>());
+            RegisterDataBindingProperty(value => value.End, (value, newValue) => value.End = newValue, new FloatDataBindingConverter<FloatRange>(), "End");
-
+            
             CurrentValueSet += OnCurrentValueSet;
         }
 

src/Artemis.Core/DefaultTypes/Properties/IntLayerProperty.cs

@@ -7,7 +7,7 @@ namespace Artemis.Core
     {
         internal IntLayerProperty()
         {
-            RegisterDataBindingProperty(value => value, new IntDataBindingConverter());
+            RegisterDataBindingProperty(value => value, (_, newValue) => CurrentValue = newValue, new IntDataBindingConverter(), "Value");
         }
 
         /// <summary>

src/Artemis.Core/DefaultTypes/Properties/IntRangeLayerProperty.cs

@@ -5,8 +5,8 @@
     {
         internal IntRangeLayerProperty()
         {
-            RegisterDataBindingProperty(range => range.Start, new IntDataBindingConverter<IntRange>());
+            RegisterDataBindingProperty(value => value.Start, (value, newValue) => value.Start = newValue, new IntDataBindingConverter<IntRange>(), "Start");
-            RegisterDataBindingProperty(range => range.End, new IntDataBindingConverter<IntRange>());
+            RegisterDataBindingProperty(value => value.End, (value, newValue) => value.End = newValue, new IntDataBindingConverter<IntRange>(), "End");
 
             CurrentValueSet += OnCurrentValueSet;
         }

src/Artemis.Core/DefaultTypes/Properties/SKColorLayerProperty.cs

@@ -7,7 +7,7 @@ namespace Artemis.Core
     {
         internal SKColorLayerProperty()
         {
-            RegisterDataBindingProperty(value => value, new SKColorDataBindingConverter());
+            RegisterDataBindingProperty(value => value, (_, newValue) => CurrentValue = newValue, new SKColorDataBindingConverter(), "Value");
         }
 
         /// <summary>

src/Artemis.Core/DefaultTypes/Properties/SKPointLayerProperty.cs

@@ -7,8 +7,9 @@ namespace Artemis.Core
     {
         internal SKPointLayerProperty()
         {
-            RegisterDataBindingProperty(point => point.X, new FloatDataBindingConverter<SKPoint>());
+            RegisterDataBindingProperty(value => value.X, (value, newValue) => value.X = newValue, new FloatDataBindingConverter<SKPoint>(), "X");
-            RegisterDataBindingProperty(point => point.Y, new FloatDataBindingConverter<SKPoint>());
+            RegisterDataBindingProperty(value => value.Y, (value, newValue) => value.Y = newValue, new FloatDataBindingConverter<SKPoint>(), "Y");
+
         }
 
         /// <summary>

src/Artemis.Core/DefaultTypes/Properties/SKSizeLayerProperty.cs

@@ -7,8 +7,8 @@ namespace Artemis.Core
     {
         internal SKSizeLayerProperty()
         {
-            RegisterDataBindingProperty(size => size.Height, new FloatDataBindingConverter<SKSize>());
+            RegisterDataBindingProperty(value => value.Height, (value, newValue) => value.Height = newValue, new FloatDataBindingConverter<SKSize>(), "Height");
-            RegisterDataBindingProperty(size => size.Width, new FloatDataBindingConverter<SKSize>());
+            RegisterDataBindingProperty(value => value.Width, (value, newValue) => value.Width = newValue, new FloatDataBindingConverter<SKSize>(), "Width");
         }
 
         /// <summary>

src/Artemis.Core/Models/Profile/DataBindings/DataBinding.cs

@@ -97,7 +97,7 @@ namespace Artemis.Core
         /// </summary>
         public Type? GetTargetType()
         {
-            return Registration?.PropertyExpression.ReturnType;
+            return Registration?.Getter.Method.ReturnType;
         }
 
         private void ResetEasing(TProperty value)
@@ -293,7 +293,7 @@ namespace Artemis.Core
 
             // Don't save an invalid state
             if (Registration != null)
-                Entity.TargetExpression = Registration.PropertyExpression.ToString();
+                Entity.TargetExpression = Registration.Getter.ToString();
 
             Entity.EasingTime = EasingTime;
             Entity.EasingFunction = (int) EasingFunction;

src/Artemis.Core/Models/Profile/DataBindings/DataBindingConverter.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Linq.Expressions;
-using System.Reflection;
 
 namespace Artemis.Core
 {
@@ -10,21 +8,6 @@ namespace Artemis.Core
     /// </summary>
     public abstract class DataBindingConverter<TLayerProperty, TProperty> : IDataBindingConverter
     {
-        /// <summary>
-        ///     Gets a dynamically compiled getter pointing to the data bound property
-        /// </summary>
-        public Func<TLayerProperty, TProperty>? GetExpression { get; private set; }
-
-        /// <summary>
-        ///     Gets a dynamically compiled setter pointing to the data bound property used for value types
-        /// </summary>
-        public Action<TProperty>? ValueTypeSetExpression { get; private set; }
-
-        /// <summary>
-        ///     Gets a dynamically compiled setter pointing to the data bound property used for reference types
-        /// </summary>
-        public Action<TLayerProperty, TProperty>? ReferenceTypeSetExpression { get; private set; }
-
         /// <summary>
         ///     Gets the data binding this converter is applied to
         /// </summary>
@@ -40,9 +23,6 @@ namespace Artemis.Core
         /// </summary>
         public bool SupportsInterpolate { get; protected set; }
 
-        /// <inheritdoc />
-        public Type SupportedType => typeof(TProperty);
-
         /// <summary>
         ///     Returns the sum of <paramref name="a" /> and <paramref name="b" />
         /// </summary>
@@ -65,12 +45,9 @@ namespace Artemis.Core
         /// <param name="value"></param>
         public virtual void ApplyValue(TProperty value)
         {
-            if (DataBinding == null)
+            if (DataBinding?.Registration == null)
                 throw new ArtemisCoreException("Data binding converter is not yet initialized");
-            if (ReferenceTypeSetExpression != null)
+            DataBinding.Registration.Setter(DataBinding.LayerProperty.CurrentValue, value);
-                ReferenceTypeSetExpression(DataBinding.LayerProperty.CurrentValue, value);
-            else if (ValueTypeSetExpression != null)
-                ValueTypeSetExpression(value);
         }
 
         /// <summary>
@@ -78,9 +55,9 @@ namespace Artemis.Core
         /// </summary>
         public virtual TProperty GetValue()
         {
-            if (DataBinding == null || GetExpression == null)
+            if (DataBinding?.Registration == null)
                 throw new ArtemisCoreException("Data binding converter is not yet initialized");
-            return GetExpression(DataBinding.LayerProperty.CurrentValue);
+            return DataBinding.Registration.Getter(DataBinding.LayerProperty.CurrentValue);
         }
 
         /// <summary>
@@ -104,83 +81,10 @@ namespace Artemis.Core
                 throw new ArtemisCoreException("Cannot initialize a data binding converter for a data binding without a registration");
 
             DataBinding = dataBinding;
-            GetExpression = dataBinding.Registration.PropertyExpression.Compile();
-            CreateSetExpression();
-
             OnInitialized();
         }
 
-        private void CreateSetExpression()
+        /// <inheritdoc />
-        {
+        public Type SupportedType => typeof(TProperty);
-            // If the registration does not point towards a member of LayerProperty<T>.CurrentValue, assign directly to LayerProperty<T>.CurrentValue
-            if (DataBinding!.Registration?.Member == null)
-            {
-                CreateSetCurrentValueExpression();
-                return;
-            }
-
-            // Ensure the member of LayerProperty<T>.CurrentValue has a setter
-            MethodInfo? setterMethod = null;
-            if (DataBinding.Registration.Member is PropertyInfo propertyInfo)
-                setterMethod = propertyInfo.GetSetMethod();
-            // If there is no setter, the built-in data binding cannot do its job, stay null
-            if (setterMethod == null)
-                return;
-
-            // If LayerProperty<T>.CurrentValue is a value type, assign it directly to LayerProperty<T>.CurrentValue after applying the changes
-            if (typeof(TLayerProperty).IsValueType)
-                CreateSetValueTypeExpression();
-            // If it is a reference type it can safely be updated by its reference
-            else
-                CreateSetReferenceTypeExpression();
-        }
-
-        private void CreateSetReferenceTypeExpression()
-        {
-            if (DataBinding!.Registration?.Member == null)
-                throw new ArtemisCoreException("Cannot create value setter for data binding without a registration");
-
-            ParameterExpression propertyValue = Expression.Parameter(typeof(TProperty), "propertyValue");
-            ParameterExpression parameter = Expression.Parameter(typeof(TLayerProperty), "currentValue");
-            MemberExpression memberAccess = Expression.MakeMemberAccess(parameter, DataBinding.Registration.Member);
-            BinaryExpression assignment = Expression.Assign(memberAccess, propertyValue);
-            Expression<Action<TLayerProperty, TProperty>> referenceTypeLambda = Expression.Lambda<Action<TLayerProperty, TProperty>>(assignment, parameter, propertyValue);
-
-            ReferenceTypeSetExpression = referenceTypeLambda.Compile();
-        }
-
-        private void CreateSetValueTypeExpression()
-        {
-            if (DataBinding!.Registration?.Member == null)
-                throw new ArtemisCoreException("Cannot create value setter for data binding without a registration");
-
-            ParameterExpression propertyValue = Expression.Parameter(typeof(TProperty), "propertyValue");
-            ParameterExpression variableCurrent = Expression.Variable(typeof(TLayerProperty), "current");
-            ConstantExpression layerProperty = Expression.Constant(DataBinding.LayerProperty);
-            MemberExpression layerPropertyMemberAccess = Expression.MakeMemberAccess(layerProperty,
-                DataBinding.LayerProperty.GetType().GetMember(nameof(DataBinding.LayerProperty.CurrentValue))[0]);
-
-            BlockExpression body = Expression.Block(
-                new[] {variableCurrent},
-                Expression.Assign(variableCurrent, layerPropertyMemberAccess),
-                Expression.Assign(Expression.MakeMemberAccess(variableCurrent, DataBinding.Registration.Member), propertyValue),
-                Expression.Assign(layerPropertyMemberAccess, variableCurrent)
-            );
-
-            Expression<Action<TProperty>> valueTypeLambda = Expression.Lambda<Action<TProperty>>(body, propertyValue);
-            ValueTypeSetExpression = valueTypeLambda.Compile();
-        }
-
-        private void CreateSetCurrentValueExpression()
-        {
-            ParameterExpression propertyValue = Expression.Parameter(typeof(TProperty), "propertyValue");
-            ConstantExpression layerProperty = Expression.Constant(DataBinding!.LayerProperty);
-            MemberExpression layerPropertyMemberAccess = Expression.MakeMemberAccess(layerProperty,
-                DataBinding.LayerProperty.GetType().GetMember(nameof(DataBinding.LayerProperty.CurrentValue))[0]);
-
-            BinaryExpression body = Expression.Assign(layerPropertyMemberAccess, propertyValue);
-            Expression<Action<TProperty>> lambda = Expression.Lambda<Action<TProperty>>(body, propertyValue);
-            ValueTypeSetExpression = lambda.Compile();
-        }
     }
 }

src/Artemis.Core/Models/Profile/DataBindings/DataBindingRegistration.cs

@@ -1,7 +1,5 @@
 using System;
 using System.Linq;
-using System.Linq.Expressions;
-using System.Reflection;
 using Artemis.Storage.Entities.Profile.DataBindings;
 
 namespace Artemis.Core
@@ -9,16 +7,16 @@ namespace Artemis.Core
     /// <inheritdoc />
     public class DataBindingRegistration<TLayerProperty, TProperty> : IDataBindingRegistration
     {
-        internal DataBindingRegistration(LayerProperty<TLayerProperty> layerProperty,
+        internal DataBindingRegistration(LayerProperty<TLayerProperty> layerProperty, DataBindingConverter<TLayerProperty, TProperty> converter,
-            DataBindingConverter<TLayerProperty, TProperty> converter,
+            Func<TLayerProperty, TProperty> getter,
-            Expression<Func<TLayerProperty, TProperty>> propertyExpression)
+            Action<TLayerProperty, TProperty> setter,
+            string displayName)
         {
             LayerProperty = layerProperty ?? throw new ArgumentNullException(nameof(layerProperty));
             Converter = converter ?? throw new ArgumentNullException(nameof(converter));
-            PropertyExpression = propertyExpression ?? throw new ArgumentNullException(nameof(propertyExpression));
+            Getter = getter ?? throw new ArgumentNullException(nameof(getter));
-
+            Setter = setter ?? throw new ArgumentNullException(nameof(setter));
-            if (propertyExpression.Body is MemberExpression memberExpression)
+            DisplayName = displayName ?? throw new ArgumentNullException(nameof(displayName));
-                Member = memberExpression.Member;
         }
 
         /// <summary>
@@ -32,15 +30,19 @@ namespace Artemis.Core
         public DataBindingConverter<TLayerProperty, TProperty> Converter { get; }
 
         /// <summary>
-        ///     Gets the expression that that accesses the property
+        ///     Gets the function to call to get the value of the property
         /// </summary>
-        public Expression<Func<TLayerProperty, TProperty>> PropertyExpression { get; }
+        public Func<TLayerProperty, TProperty> Getter { get; }
 
         /// <summary>
-        ///     Gets the member the <see cref="PropertyExpression" /> targets
+        ///     Gets the action to call to set the value of the property
-        ///     <para><see langword="null"/> if the <see cref="PropertyExpression" /> is not a member expression</para>
         /// </summary>
-        public MemberInfo? Member { get; }
+        public Action<TLayerProperty, TProperty> Setter { get; }
+
+        /// <summary>
+        ///     Gets or sets the display name of the data binding registration
+        /// </summary>
+        public string DisplayName { get; set; }
 
         /// <summary>
         ///     Gets the data binding created using this registration
@@ -59,7 +61,7 @@ namespace Artemis.Core
             if (DataBinding != null)
                 return DataBinding;
 
-            DataBindingEntity? dataBinding = LayerProperty.Entity.DataBindingEntities.FirstOrDefault(e => e.TargetExpression == PropertyExpression.ToString());
+            DataBindingEntity? dataBinding = LayerProperty.Entity.DataBindingEntities.FirstOrDefault(e => e.TargetExpression == Getter.ToString());
             if (dataBinding == null)
                 return null;
 

src/Artemis.Core/Models/Profile/LayerProperties/LayerProperty.cs

@@ -393,7 +393,7 @@ namespace Artemis.Core
                 throw new ObjectDisposedException("LayerProperty");
 
             IDataBindingRegistration? match = _dataBindingRegistrations.FirstOrDefault(r => r is DataBindingRegistration<T, TProperty> registration &&
-                                                                                            registration.PropertyExpression.ToString() == expression);
+                                                                                            registration.Getter.ToString() == expression);
             return (DataBindingRegistration<T, TProperty>?) match;
         }
 
@@ -410,21 +410,30 @@ namespace Artemis.Core
         ///     Registers a data binding property so that is available to the data binding system
         /// </summary>
         /// <typeparam name="TProperty">The type of the layer property</typeparam>
-        /// <param name="propertyExpression">The expression pointing to the value to register</param>
+        /// <param name="getter">The function to call to get the value of the property</param>
+        /// <param name="setter">The action to call to set the value of the property</param>
         /// <param name="converter">The converter to use while applying the data binding</param>
-        public void RegisterDataBindingProperty<TProperty>(Expression<Func<T, TProperty>> propertyExpression, DataBindingConverter<T, TProperty> converter)
+        /// <param name="displayName">The display name of the data binding property</param>
+        public DataBindingRegistration<T, TProperty> RegisterDataBindingProperty<TProperty>(Func<T, TProperty> getter, Action<T, TProperty> setter, DataBindingConverter<T, TProperty> converter, 
+            string displayName)
         {
             if (_disposed)
                 throw new ObjectDisposedException("LayerProperty");
 
-            if (propertyExpression.Body.NodeType != ExpressionType.MemberAccess && propertyExpression.Body.NodeType != ExpressionType.Parameter)
+           DataBindingRegistration<T, TProperty> registration = new(this, converter, getter, setter, displayName);
-                throw new ArtemisCoreException("Provided expression is invalid, it must be 'value => value' or 'value => value.Property'");
+            _dataBindingRegistrations.Add(registration);
+            return registration;
+        }
 
-            if (converter.SupportedType != propertyExpression.ReturnType)
+        /// <summary>
-                throw new ArtemisCoreException($"Cannot register data binding property for property {PropertyDescription.Name} " +
+        ///     Removes all data binding properties so they are no longer available to the data binding system
-                                               "because the provided converter does not support the property's type");
+        /// </summary>
+        public void ClearDataBindingProperties()
+        {
+            if (_disposed)
+                throw new ObjectDisposedException("LayerProperty");
 
-            _dataBindingRegistrations.Add(new DataBindingRegistration<T, TProperty>(this, converter, propertyExpression));
+            _dataBindingRegistrations.Clear();
         }
 
         /// <summary>

src/Artemis.UI/Screens/ProfileEditor/LayerProperties/DataBindings/DataBindingViewModel.cs

@@ -38,11 +38,7 @@ namespace Artemis.UI.Screens.ProfileEditor.LayerProperties.DataBindings
             _profileEditorService = profileEditorService;
             _dataBindingsVmFactory = dataBindingsVmFactory;
 
-            if (Registration.Member != null)
+            DisplayName = Registration.DisplayName.ToUpper();
-                DisplayName = Registration.Member.Name.ToUpper();
-            else
-                DisplayName = Registration.LayerProperty.PropertyDescription.Name.ToUpper();
-
             AlwaysApplyDataBindings = settingsService.GetSetting("ProfileEditor.AlwaysApplyDataBindings", true);
             DataBindingModes = new BindableCollection<ValueDescription>(EnumUtilities.GetAllValuesAndDescriptions(typeof(DataBindingModeType)));
             EasingViewModels = new BindableCollection<TimelineEasingViewModel>();

src/Artemis.UI/Screens/ProfileEditor/Visualization/ProfileViewModel.cs

@@ -302,7 +302,7 @@ namespace Artemis.UI.Screens.ProfileEditor.Visualization
             TimeSpan delta = DateTime.Now - _lastUpdate;
             _lastUpdate = DateTime.Now;
 
-            if (!AlwaysApplyDataBindings.Value || _profileEditorService.SelectedProfile == null || _profileEditorService.Playing)
+            if (!AlwaysApplyDataBindings.Value || _profileEditorService.SelectedProfile == null)
                 return;
 
             foreach (IDataBindingRegistration dataBindingRegistration in _profileEditorService.SelectedProfile.GetAllFolders()