Only disable alpha editing controls when IsAlphaEnabled is false

Rely on IsAlphaVisible for visibility

src/Avalonia.Controls.ColorPicker/ColorView/ColorView.Properties.cs

@@ -270,7 +270,7 @@ namespace Avalonia.Controls
         /// <summary>
         /// Gets or sets a value indicating whether the alpha component is enabled.
         /// When disabled (set to false) the alpha component will be fixed to maximum and
-        /// editing controls hidden.
+        /// editing controls disabled.
         /// </summary>
         public bool IsAlphaEnabled
         {
@@ -357,7 +357,7 @@ namespace Avalonia.Controls
         /// </summary>
         /// <remarks>
         /// All color components are controlled by this property but alpha can also be
-        /// controlled with <see cref="IsAlphaEnabled"/> and <see cref="IsAlphaVisible"/>.
+        /// controlled with <see cref="IsAlphaVisible"/>.
         /// </remarks>
         public bool IsComponentSliderVisible
         {
@@ -370,7 +370,7 @@ namespace Avalonia.Controls
         /// </summary>
         /// <remarks>
         /// All color components are controlled by this property but alpha can also be
-        /// controlled with <see cref="IsAlphaEnabled"/> and <see cref="IsAlphaVisible"/>.
+        /// controlled with <see cref="IsAlphaVisible"/>.
         /// </remarks>
         public bool IsComponentTextInputVisible
         {

src/Avalonia.Controls.ColorPicker/Themes/Fluent/ColorView.xaml

@@ -187,11 +187,10 @@
                                         HsvColor="{Binding HsvColor, ElementName=ColorSpectrum}"
                                         HorizontalAlignment="Center"
                                         VerticalAlignment="Stretch"
-                                        Margin="12,0,0,0">
+                                        Margin="12,0,0,0"
+                                        IsEnabled="{TemplateBinding IsAlphaEnabled}">
                   <primitives:ColorSlider.IsVisible>
                     <MultiBinding Converter="{x:Static BoolConverters.And}">
-                      <Binding RelativeSource="{RelativeSource TemplatedParent}"
-                               Path="IsAlphaEnabled" />
                       <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                Path="IsAlphaVisible" />
                     </MultiBinding>
@@ -564,7 +563,8 @@
                         BorderBrush="{DynamicResource TextControlBorderBrush}"
                         BorderThickness="1,1,0,1"
                         CornerRadius="4,0,0,4"
-                        VerticalAlignment="Center">
+                        VerticalAlignment="Center"
+                        IsEnabled="{TemplateBinding IsAlphaEnabled}">
                   <TextBlock x:Name="AlphaComponentTextBlock"
                              Foreground="{DynamicResource TextControlForegroundDisabled}"
                              FontWeight="SemiBold"
@@ -573,8 +573,6 @@
                              VerticalAlignment="Center" />
                   <Border.IsVisible>
                     <MultiBinding Converter="{x:Static BoolConverters.And}">
-                      <Binding RelativeSource="{RelativeSource TemplatedParent}"
-                               Path="IsAlphaEnabled" />
                       <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                Path="IsAlphaVisible" />
                       <Binding RelativeSource="{RelativeSource TemplatedParent}"
@@ -595,11 +593,10 @@
                                NumberFormat="{StaticResource ComponentNumberFormatInfo}"
                                Minimum="{Binding Minimum, ElementName=AlphaComponentSlider}"
                                Maximum="{Binding Maximum, ElementName=AlphaComponentSlider}"
-                               Value="{Binding Value, ElementName=AlphaComponentSlider}">
+                               Value="{Binding Value, ElementName=AlphaComponentSlider}"
+                               IsEnabled="{TemplateBinding IsAlphaEnabled}">
                   <NumericUpDown.IsVisible>
                     <MultiBinding Converter="{x:Static BoolConverters.And}">
-                      <Binding RelativeSource="{RelativeSource TemplatedParent}"
-                               Path="IsAlphaEnabled" />
                       <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                Path="IsAlphaVisible" />
                       <Binding RelativeSource="{RelativeSource TemplatedParent}"
@@ -618,11 +615,10 @@
                                         ColorModel="{TemplateBinding ColorModel, Mode=OneWay}"
                                         HsvColor="{Binding HsvColor, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"
                                         HorizontalAlignment="Stretch"
-                                        VerticalAlignment="Center">
+                                        VerticalAlignment="Center"
+                                        IsEnabled="{TemplateBinding IsAlphaEnabled}">
                   <primitives:ColorSlider.IsVisible>
                     <MultiBinding Converter="{x:Static BoolConverters.And}">
-                      <Binding RelativeSource="{RelativeSource TemplatedParent}"
-                               Path="IsAlphaEnabled" />
                       <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                Path="IsAlphaVisible" />
                       <Binding RelativeSource="{RelativeSource TemplatedParent}"