chore: add IsDisabled prop for ScrollViewerAttach.

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

@@ -1,7 +1,9 @@
 using System;
 using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Input;
 using HandyControl.Data;
+using HandyControl.Tools;
 
 namespace HandyControl.Controls;
 
@@ -30,21 +32,21 @@ public class ScrollViewerAttach
         {
             if ((Orientation) e.NewValue == Orientation.Horizontal)
             {
-                scrollViewer.PreviewMouseWheel += ScrollViewer_PreviewMouseWheel;
+                scrollViewer.PreviewMouseWheel += ScrollViewerPreviewMouseWheel;
             }
             else
             {
-                scrollViewer.PreviewMouseWheel -= ScrollViewer_PreviewMouseWheel;
+                scrollViewer.PreviewMouseWheel -= ScrollViewerPreviewMouseWheel;
             }
         }
-    }
 
-    private static void ScrollViewer_PreviewMouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
+        void ScrollViewerPreviewMouseWheel(object sender, MouseWheelEventArgs args)
-    {
+        {
-        var scrollViewer = (System.Windows.Controls.ScrollViewer) sender;
+            var scrollViewerNative = (System.Windows.Controls.ScrollViewer) sender;
-        scrollViewer.ScrollToHorizontalOffset(Math.Min(Math.Max(0, scrollViewer.HorizontalOffset - e.Delta), scrollViewer.ScrollableWidth));
+            scrollViewerNative.ScrollToHorizontalOffset(Math.Min(Math.Max(0, scrollViewerNative.HorizontalOffset - args.Delta), scrollViewerNative.ScrollableWidth));
 
-        e.Handled = true;
+            args.Handled = true;
+        }
     }
 
     public static void SetOrientation(DependencyObject element, Orientation value)
@@ -52,4 +54,47 @@ public class ScrollViewerAttach
 
     public static Orientation GetOrientation(DependencyObject element)
         => (Orientation) element.GetValue(OrientationProperty);
+
+    public static readonly DependencyProperty IsDisabledProperty = DependencyProperty.RegisterAttached(
+        "IsDisabled", typeof(bool), typeof(ScrollViewerAttach), new PropertyMetadata(ValueBoxes.FalseBox, OnIsDisabledChanged));
+
+    private static void OnIsDisabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+    {
+        if (d is UIElement element)
+        {
+            if ((bool)e.NewValue)
+            {
+                element.PreviewMouseWheel += ScrollViewerPreviewMouseWheel;
+            }
+            else
+            {
+                element.PreviewMouseWheel -= ScrollViewerPreviewMouseWheel;
+            }
+        }
+
+        void ScrollViewerPreviewMouseWheel(object sender, MouseWheelEventArgs args)
+        {
+            if (args.Handled)
+            {
+                return;
+            }
+
+            args.Handled = true;
+
+            if (VisualHelper.GetParent<System.Windows.Controls.ScrollViewer>((UIElement) sender) is { } scrollViewer)
+            {
+                scrollViewer.RaiseEvent(new MouseWheelEventArgs(args.MouseDevice, args.Timestamp, args.Delta)
+                {
+                    RoutedEvent = UIElement.MouseWheelEvent,
+                    Source = sender
+                });
+            }
+        }
+    }
+
+    public static void SetIsDisabled(DependencyObject element, bool value)
+        => element.SetValue(IsDisabledProperty, ValueBoxes.BooleanBox(value));
+
+    public static bool GetIsDisabled(DependencyObject element)
+        => (bool) element.GetValue(IsDisabledProperty);
 }