feat: WIP.

demo/Ursa.Demo/ViewModels/RatingDemoViewModel.cs

@@ -14,7 +14,7 @@ public partial class RatingDemoViewModel : ViewModelBase
 
     // [ObservableProperty] private object _character;
     [ObservableProperty] private int _count = 10;
-    [ObservableProperty] private double _defaultValue = 5;
+    [ObservableProperty] private double _defaultValue = 5.5;
 
     public ObservableCollection<string> Tooltips { get; set; } = ["1", "2", "3", "4", "5"];
 }

src/Ursa.Themes.Semi/Controls/Rating.axaml

@@ -3,16 +3,29 @@
                     xmlns:u="https://irihi.tech/ursa">
     <ControlTheme x:Key="{x:Type u:RatingCharacter}" TargetType="u:RatingCharacter">
         <Setter Property="Foreground" Value="{DynamicResource RatingCharacterUnSelectedForeground}" />
+        <Setter Property="Background" Value="{DynamicResource RatingCharacterUnSelectedForeground}" />
         <Setter Property="Cursor" Value="Hand" />
         <Setter Property="VerticalAlignment" Value="Stretch" />
         <Setter Property="Template">
             <ControlTemplate TargetType="u:RatingCharacter">
-                <PathIcon Name="{x:Static u:RatingCharacter.PART_IconGlyph}"
+                <!-- <Border Margin="0 0 6 0"> -->
-                          Width="24"
+                    <Canvas Width="24" Height="24">
-                          Height="24"
+                        <Path Width="24"
-                          Margin="0 0 6 0"
+                              Height="24"
-                          Data="{DynamicResource RatingStarIconGlyph}"
+                              Data="{DynamicResource RatingStarIconGlyph}"
-                          Foreground="{TemplateBinding Foreground}" />
+                              Fill="{TemplateBinding Background}" />
+                        <Border Name="{x:Static u:RatingCharacter.PART_IconGlyph}"
+                                IsVisible="True"
+                                ClipToBounds="True">
+                            <Path Width="24"
+                                  Height="24"
+                                  HorizontalAlignment="Left"
+                                  Data="{DynamicResource RatingStarIconGlyph}"
+                                  Fill="{TemplateBinding Foreground}" />
+                        </Border>
+                    </Canvas>
+                <!-- </Border> -->
+
             </ControlTemplate>
         </Setter>
         <Style Selector="^:pointerover">
@@ -21,6 +34,14 @@
         <Style Selector="^:selected">
             <Setter Property="Foreground" Value="{DynamicResource RatingCharacterSelectedForeground}" />
         </Style>
+        <Style Selector="^:half">
+            <!-- <Setter Property="Foreground"> -->
+            <!--     <LinearGradientBrush StartPoint="0%,0%" EndPoint="0%,100%"> -->
+            <!--         <GradientStop Color="#6b4c1b" Offset="0" /> -->
+            <!--         <GradientStop Color="#291e10" Offset="1" /> -->
+            <!--     </LinearGradientBrush> -->
+            <!-- </Setter> -->
+        </Style>
     </ControlTheme>
 
     <ControlTheme x:Key="{x:Type u:Rating}" TargetType="u:Rating">

src/Ursa/Controls/Rating/Rating.cs

@@ -19,6 +19,7 @@ public class Rating : TemplatedControl
     protected const string PC_Selected = ":selected";
 
     private ItemsControl? _itemsControl;
+    private const double Tolerance = 0.0001;
 
     public static readonly StyledProperty<double> ValueProperty =
         AvaloniaProperty.Register<Rating, double>(nameof(Value), defaultBindingMode: BindingMode.TwoWay);
@@ -217,7 +218,13 @@ public class Rating : TemplatedControl
     public void Select(RatingCharacter o)
     {
         var index = Items.IndexOf(o);
-        if (AllowClear && index == (int)Value - 1)
+        double newValue = index + 1;
+        if (o.IsHalf)
+        {
+            newValue = index + 0.5;
+        }
+
+        if (AllowClear && Math.Abs(Value - newValue) < Tolerance)
         {
             UpdateItems(-1);
             SetCurrentValue(ValueProperty, 0);
@@ -225,7 +232,7 @@ public class Rating : TemplatedControl
         else
         {
             UpdateItems(index);
-            SetCurrentValue(ValueProperty, index + 1);
+            SetCurrentValue(ValueProperty, newValue);
         }
     }
 

src/Ursa/Controls/Rating/RatingCharacter.cs

@@ -6,12 +6,35 @@ using Avalonia.LogicalTree;
 
 namespace Ursa.Controls;
 
-[PseudoClasses(PC_Selected)]
+[PseudoClasses(PC_Selected, PC_Half)]
-[TemplatePart(PART_IconGlyph, typeof(PathIcon))]
+[TemplatePart(PART_IconGlyph, typeof(Control))]
 public class RatingCharacter : TemplatedControl
 {
     public const string PART_IconGlyph = "PART_IconGlyph";
     protected const string PC_Selected = ":selected";
+    protected const string PC_Half = ":half";
+
+    private Control? _icon;
+
+    private bool _isHalf;
+
+    internal bool IsHalf
+    {
+        get => _isHalf;
+        set
+        {
+            if (_isHalf == value) return;
+            _isHalf = value;
+            if (_icon is null) return;
+            _icon.Width = value ? Bounds.Width / 2 : Bounds.Width;
+        }
+    }
+
+    protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+    {
+        base.OnApplyTemplate(e);
+        _icon = e.NameScope.Find<Control>(PART_IconGlyph);
+    }
 
     protected override void OnPointerEntered(PointerEventArgs e)
     {
@@ -19,6 +42,27 @@ public class RatingCharacter : TemplatedControl
         parent?.Preview(this);
     }
 
+    protected override void OnPointerMoved(PointerEventArgs e)
+    {
+        var p = e.GetPosition(this);
+        var flag = p.X < Bounds.Width / 2;
+        PseudoClasses.Set(PC_Half, flag);
+        IsHalf = flag;
+        // if (flag)
+        // {
+        //     _icon.Width = Bounds.Width / 2;
+        // }
+        // else
+        // {
+        //     _icon.Width = Bounds.Width;
+        // }
+    }
+
+    // protected override void OnPointerExited(PointerEventArgs e)
+    // {
+    //     // _icon.Width = Bounds.Width;
+    // }
+
     protected override void OnPointerReleased(PointerReleasedEventArgs e)
     {
         var parent = this.GetLogicalAncestors().OfType<Rating>().FirstOrDefault();