feat: almost complete.

demo/Ursa.Demo/Pages/RatingDemo.axaml

@@ -21,8 +21,7 @@
                         IsEnabled="{Binding IsEnabled}"
                         Value="{Binding Value}"
                         Count="{Binding Count}"
-                        DefaultValue="{Binding DefaultValue }"
+                        DefaultValue="{Binding DefaultValue }" />
-                        Tooltips="{Binding Tooltips }" />
                 </StackPanel>
             </Grid>
             <Border Grid.Column="1" VerticalAlignment="Top">
@@ -71,41 +70,40 @@
                         Grid.Row="4"
                         Grid.Column="0"
                         VerticalAlignment="Center"
-                        Content="Value" />
+                        Content="DefaultValue" />
-                    <NumericUpDown
+                    <Label
                         Grid.Row="4"
                         Grid.Column="1"
+                        Theme="{StaticResource TagLabel}"
+                        Classes="Large"
+                        VerticalAlignment="Center"
+                        Content="{Binding DefaultValue}" />
+                    <Label
+                        Grid.Row="5"
+                        Grid.Column="0"
+                        VerticalAlignment="Center"
+                        Content="Value" />
+                    <NumericUpDown
+                        Grid.Row="5"
+                        Grid.Column="1"
                         Maximum="100"
-                        Minimum="-1"
+                        Minimum="-10"
                         Increment="0.1"
                         VerticalAlignment="Center"
                         Value="{Binding Value}" />
                     <Label
-                        Grid.Row="5"
+                        Grid.Row="6"
                         Grid.Column="0"
                         VerticalAlignment="Center"
                         Content="Count" />
                     <NumericUpDown
-                        Grid.Row="5"
+                        Grid.Row="6"
                         Grid.Column="1"
                         Maximum="100"
-                        Minimum="-1"
+                        Minimum="-10"
                         Increment="1"
                         VerticalAlignment="Center"
                         Value="{Binding Count}" />
-                    <Label
-                        Grid.Row="6"
-                        Grid.Column="0"
-                        VerticalAlignment="Center"
-                        Content="DefaultValue" />
-                    <NumericUpDown
-                        Grid.Row="6"
-                        Grid.Column="1"
-                        Maximum="100"
-                        Minimum="-1"
-                        Increment="0.1"
-                        VerticalAlignment="Center"
-                        Value="{Binding DefaultValue}" />
                 </Grid>
             </Border>
         </Grid>

src/Ursa/Controls/Rating/Rating.cs

@@ -1,13 +1,10 @@
-using System.Collections;
+using Avalonia;
-using System.Collections.ObjectModel;
-using Avalonia;
 using Avalonia.Collections;
 using Avalonia.Controls;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
 using Avalonia.Controls.Templates;
 using Avalonia.Data;
-using Avalonia.Input;
 using Avalonia.Interactivity;
 
 namespace Ursa.Controls;
@@ -20,7 +17,7 @@ public class Rating : TemplatedControl
     protected const string PC_Selected = ":selected";
 
     private ItemsControl? _itemsControl;
-    private const double Tolerance = 0.0001;
+    private const double Tolerance = 0.00000001;
 
     public static readonly StyledProperty<double> ValueProperty =
         AvaloniaProperty.Register<Rating, double>(nameof(Value), defaultBindingMode: BindingMode.TwoWay);
@@ -43,18 +40,6 @@ public class Rating : TemplatedControl
     public static readonly StyledProperty<double> DefaultValueProperty =
         AvaloniaProperty.Register<Rating, double>(nameof(DefaultValue));
 
-    public static readonly StyledProperty<IList<string>> TooltipsProperty =
-        AvaloniaProperty.Register<Rating, IList<string>>(nameof(Tooltips));
-
-    public static readonly StyledProperty<string> SelectedTooltipProperty =
-        AvaloniaProperty.Register<Rating, string>(nameof(SelectedTooltip));
-
-    public string SelectedTooltip
-    {
-        get => GetValue(SelectedTooltipProperty);
-        set => SetValue(SelectedTooltipProperty, value);
-    }
-
     public static readonly StyledProperty<IDataTemplate?> ItemTemplateProperty =
         AvaloniaProperty.Register<Rating, IDataTemplate?>(nameof(ItemTemplate));
 
@@ -100,25 +85,19 @@ public class Rating : TemplatedControl
         set => SetValue(DefaultValueProperty, value);
     }
 
-    public IList<string> Tooltips
-    {
-        get => GetValue(TooltipsProperty);
-        set => SetValue(TooltipsProperty, value);
-    }
-
     public IDataTemplate? ItemTemplate
     {
         get => GetValue(ItemTemplateProperty);
         set => SetValue(ItemTemplateProperty, value);
     }
 
-    public static readonly DirectProperty<Rating, IList> ItemsProperty =
+    public static readonly DirectProperty<Rating, AvaloniaList<RatingCharacter>> ItemsProperty =
-        AvaloniaProperty.RegisterDirect<Rating, IList>(
+        AvaloniaProperty.RegisterDirect<Rating, AvaloniaList<RatingCharacter>>(
             nameof(Items), o => o.Items);
 
-    private IList _items;
+    private AvaloniaList<RatingCharacter> _items;
 
-    public IList Items
+    public AvaloniaList<RatingCharacter> Items
     {
         get => _items;
         private set => SetAndRaise(ItemsProperty, ref _items, value);
@@ -126,14 +105,14 @@ public class Rating : TemplatedControl
 
     public Rating()
     {
-        Items = new AvaloniaList<object>();
+        Items = [];
-        Tooltips = new ObservableCollection<string>();
     }
 
     static Rating()
     {
         ValueProperty.Changed.AddClassHandler<Rating>((s, e) => s.OnValueChanged(e));
         CountProperty.Changed.AddClassHandler<Rating>((s, e) => s.OnCountChanged(e));
+        AllowHalfProperty.Changed.AddClassHandler<Rating>((s, e) => s.OnAllowHalfChanged(e));
     }
 
     private void OnValueChanged(AvaloniaPropertyChangedEventArgs e)
@@ -169,6 +148,23 @@ public class Rating : TemplatedControl
             }
         }
 
+        UpdateItemsByValue(Value);
+        foreach (var item in Items)
+        {
+            item.AllowHalf = AllowHalf;
+        }
+
+        AdjustWidth(Value);
+    }
+
+    private void OnAllowHalfChanged(AvaloniaPropertyChangedEventArgs e)
+    {
+        if (e.NewValue is not bool newValue) return;
+        foreach (var item in Items)
+        {
+            item.AllowHalf = newValue;
+        }
+
         UpdateItemsByValue(Value);
         AdjustWidth(Value);
     }
@@ -183,113 +179,77 @@ public class Rating : TemplatedControl
             Items.Add(new RatingCharacter());
         }
 
-        if (DefaultValue > Count)
-        {
-            SetCurrentValue(ValueProperty, Math.Max(Count, 0));
-        }
-        else
-        {
         SetCurrentValue(ValueProperty, DefaultValue);
     }
-    }
 
     protected override void OnLoaded(RoutedEventArgs e)
     {
         base.OnLoaded(e);
+        UpdateItemsByValue(Value);
         AdjustWidth(Value);
     }
 
     public void Preview(RatingCharacter o)
     {
         var index = Items.IndexOf(o);
-        var tooltipsCount = Tooltips.Count;
-        if (tooltipsCount > 0)
-        {
-            if (index < tooltipsCount)
-            {
-                SetCurrentValue(SelectedTooltipProperty, Tooltips[index]);
-            }
-            else
-            {
-                SetCurrentValue(SelectedTooltipProperty, string.Empty);
-            }
-        }
-
         UpdateItemsByIndex(index);
     }
 
-    protected override void OnPointerExited(PointerEventArgs e)
+    internal void PointerReleasedHandler(RatingCharacter o)
-    {
-        UpdateItemsByValue(Value);
-    }
-
-    public void PointerReleasedHandler(RatingCharacter o)
     {
         var index = Items.IndexOf(o);
         double newValue = index + 1;
-        if (o.IsHalf)
+        if (AllowHalf && o.IsHalf)
         {
             newValue = index + 0.5;
         }
 
         if (AllowClear && Math.Abs(Value - newValue) < Tolerance)
         {
-            UpdateItemsByValue(-1);
             SetCurrentValue(ValueProperty, 0);
         }
         else
         {
-            UpdateItemsByValue(newValue);
             SetCurrentValue(ValueProperty, newValue);
         }
     }
 
-    private void UpdateItemsByIndex(int index)
+    internal void UpdateItemsByValue(double newValue)
-    {
-        var isInt = Math.Abs(Value - Math.Floor(Value)) < Tolerance;
-        for (var i = 0; i <= index && i < Items.Count; i++)
-        {
-            if (Items[i] is RatingCharacter item)
-            {
-                item.Select(true);
-                item.IsHalf = !isInt && i == index;
-            }
-        }
-
-        for (var i = index + 1; i >= 0 && i < Items.Count; i++)
-        {
-            if (Items[i] is RatingCharacter item)
-            {
-                item.Select(false);
-                item.IsHalf = false;
-            }
-        }
-    }
-
-    private void UpdateItemsByValue(double newValue)
     {
         var index = (int)Math.Ceiling(newValue - 1);
         UpdateItemsByIndex(index);
     }
 
-    private void AdjustWidth(double newValue)
+    private void UpdateItemsByIndex(int index)
     {
-        var ratio = Math.Abs(newValue - Math.Floor(newValue));
+        for (var i = 0; i < Items.Count; i++)
-        foreach (var character in Items)
         {
-            if (character is RatingCharacter item)
+            if (i == index) continue;
-            {
+            Items[i].Select(i < index);
-                if (item.IsHalf)
+            Items[i].IsLast = false;
-                {
+            Items[i].IsHalf = false;
-                    item.Ratio = ratio;
+            Items[i].Ratio = 1;
-                }
-                else
-                {
-                    item.Ratio = 1;
         }
 
+        if (index >= Items.Count || index < 0) return;
+        var ratio = Math.Abs(Value - Math.Floor(Value));
+        var isInt = ratio < Tolerance;
+        Items[index].Select(true);
+        Items[index].IsLast = true;
+        Items[index].IsHalf = AllowHalf && !isInt;
+        Items[index].Ratio = AllowHalf ? ratio : 1;
+    }
+
+
+    internal void AdjustWidth(double newValue)
+    {
+        var ratio = Math.Abs(newValue - Math.Floor(newValue));
+        var isInt = ratio < Tolerance;
+        ratio = AllowHalf && !isInt ? ratio : 1;
+        foreach (var item in Items)
+        {
+            item.Ratio = item.IsLast ? ratio : 1;
             item.AdjustWidth();
         }
     }
-    }
 }

src/Ursa/Controls/Rating/RatingCharacter.cs

@@ -1,7 +1,9 @@
-using Avalonia.Controls;
+using Avalonia;
+using Avalonia.Controls;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
 using Avalonia.Input;
+using Avalonia.Interactivity;
 using Avalonia.LogicalTree;
 
 namespace Ursa.Controls;
@@ -15,6 +17,18 @@ public class RatingCharacter : TemplatedControl
 
     private Control? _icon;
 
+    public static readonly StyledProperty<bool> AllowHalfProperty = AvaloniaProperty.Register<RatingCharacter, bool>(
+        nameof(AllowHalf));
+
+
+    public bool AllowHalf
+    {
+        get => GetValue(AllowHalfProperty);
+        set => SetValue(AllowHalfProperty, value);
+    }
+
+    internal bool IsLast { get; set; }
+
     private bool _isHalf;
 
     internal bool IsHalf
@@ -22,6 +36,7 @@ public class RatingCharacter : TemplatedControl
         get => _isHalf;
         set
         {
+            if (!AllowHalf) return;
             _isHalf = value;
             if (_icon is null) return;
             _icon.Width = value ? Bounds.Width * 0.5 : Bounds.Width;
@@ -30,6 +45,12 @@ public class RatingCharacter : TemplatedControl
 
     internal double Ratio { get; set; }
 
+    protected override void OnLoaded(RoutedEventArgs e)
+    {
+        base.OnLoaded(e);
+        AdjustWidth();
+    }
+
     protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
     {
         base.OnApplyTemplate(e);
@@ -44,22 +65,30 @@ public class RatingCharacter : TemplatedControl
 
     protected override void OnPointerMoved(PointerEventArgs e)
     {
+        if (!AllowHalf) return;
         var p = e.GetPosition(this);
         IsHalf = p.X < Bounds.Width * 0.5;
     }
 
+    protected override void OnPointerExited(PointerEventArgs e)
+    {
+        var parent = this.GetLogicalAncestors().OfType<Rating>().FirstOrDefault();
+        parent?.UpdateItemsByValue(parent.Value);
+        parent?.AdjustWidth(parent.Value);
+    }
+
     protected override void OnPointerReleased(PointerReleasedEventArgs e)
     {
         var parent = this.GetLogicalAncestors().OfType<Rating>().FirstOrDefault();
         parent?.PointerReleasedHandler(this);
     }
 
-    public void Select(bool value)
+    internal void Select(bool value)
     {
         PseudoClasses.Set(PC_Selected, value);
     }
 
-    public void AdjustWidth()
+    internal void AdjustWidth()
     {
         if (_icon is not null)
         {