add ImageAttach

src/Shared/HandyControl_Shared/Controls/Attach/ImageAttach.cs

@@ -0,0 +1,42 @@
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace HandyControl.Controls
+{
+    public class ImageAttach
+    {
+        public static readonly DependencyProperty SourceFailedProperty = DependencyProperty.RegisterAttached(
+            "SourceFailed", typeof(ImageSource), typeof(ImageAttach), new FrameworkPropertyMetadata(default(ImageSource), FrameworkPropertyMetadataOptions.Inherits, OnSourceFailedChanged));
+
+        private static void OnSourceFailedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            if (d is Image image)
+            {
+                if (e.NewValue is ImageSource)
+                {
+                    image.ImageFailed += Image_ImageFailed;
+                }
+                else
+                {
+                    image.ImageFailed -= Image_ImageFailed;
+                }
+            }
+        }
+
+        private static void Image_ImageFailed(object sender, ExceptionRoutedEventArgs e)
+        {
+            if (sender is Image image)
+            {
+                image.SetCurrentValue(Image.SourceProperty, GetSourceFailed(image));
+                image.ImageFailed -= Image_ImageFailed;
+            }
+        }
+
+        public static void SetSourceFailed(DependencyObject element, ImageSource value)
+            => element.SetValue(SourceFailedProperty, value);
+
+        public static ImageSource GetSourceFailed(DependencyObject element)
+            => (ImageSource) element.GetValue(SourceFailedProperty);
+    }
+}

src/Shared/HandyControl_Shared/Controls/Block/ToggleBlock.cs

@@ -8,9 +8,6 @@ namespace HandyControl.Controls
     /// <summary>
     ///     切换块
     /// </summary>
-    /// <remarks>
-    ///     在不需要命中测试的情况下可代替ToggleButton或CheckBox，以减少内存用量。
-    /// </remarks>
     public class ToggleBlock : Control
     {
         public static readonly DependencyProperty IsCheckedProperty = DependencyProperty.Register(

src/Shared/HandyControl_Shared/HandyControl_Shared.projitems

@@ -17,6 +17,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\EdgeElement.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\IconElement.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\IconSwitchElement.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\ImageAttach.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\InfoElement.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\MenuTopLineAttach.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Attach\PanelElement.cs" />

src/Shared/HandyControl_Shared/Themes/Styles/Base/ToggleBlockBaseStyle.xaml

@@ -3,7 +3,6 @@
                     xmlns:controls="clr-namespace:HandyControl.Controls">
 
     <Style x:Key="ToggleBlockBaseStyle" TargetType="controls:ToggleBlock">
-        <Setter Property="IsHitTestVisible" Value="False"/>
         <Setter Property="VerticalContentAlignment" Value="Center"/>
         <Setter Property="HorizontalContentAlignment" Value="Center"/>
         <Setter Property="Template">
@@ -19,11 +18,17 @@
                     <ControlTemplate.Triggers>
                         <Trigger Property="IsChecked" Value="True">
                             <Setter TargetName="ContentPresenterChecked" Property="Visibility" Value="Visible"/>
+                            <Setter TargetName="ContentPresenterUnChecked" Property="Visibility" Value="Collapsed"/>
+                            <Setter TargetName="ContentPresenterIndeterminate" Property="Visibility" Value="Collapsed"/>
                         </Trigger>
                         <Trigger Property="IsChecked" Value="False">
+                            <Setter TargetName="ContentPresenterChecked" Property="Visibility" Value="Collapsed"/>
                             <Setter TargetName="ContentPresenterUnChecked" Property="Visibility" Value="Visible"/>
+                            <Setter TargetName="ContentPresenterIndeterminate" Property="Visibility" Value="Collapsed"/>
                         </Trigger>
                         <Trigger Property="IsChecked" Value="{x:Null}">
+                            <Setter TargetName="ContentPresenterChecked" Property="Visibility" Value="Collapsed"/>
+                            <Setter TargetName="ContentPresenterUnChecked" Property="Visibility" Value="Collapsed"/>
                             <Setter TargetName="ContentPresenterIndeterminate" Property="Visibility" Value="Visible"/>
                         </Trigger>
                     </ControlTemplate.Triggers>