enhance: scrolling accumulation

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Views/BinaryFileViewer.axaml.cs

@@ -335,16 +335,15 @@ protected override void OnPointerWheelChanged(PointerWheelEventArgs e)
         {
             base.OnPointerWheelChanged(e);
 
-            if (Content is not ViewModels.BinaryFile file)
+            if (Content is not ViewModels.BinaryFile)
                 return;
 
             // TextBox itself contains a ScrollBar.
             var scroller = this.FindDescendantOfType<ScrollBar>(false, s => s.Name.Equals("HexViewerScroller", StringComparison.Ordinal));
             if (scroller == null)
                 return;
 
-            var delta = Math.Ceiling(e.Delta.Y) * HexViewer.LINE_HEIGHT;
-            scroller.Value -= delta;
+            scroller.Value -= e.Delta.Y * HexViewer.LINE_HEIGHT;
         }
 
         private void OnScrollBarValueChanged(object sender, RangeBaseValueChangedEventArgs e)
@@ -411,8 +410,7 @@ private void OnGotoAddressTextChanged(object sender, TextChangedEventArgs e)
                 if (scroller == null)
                     return;
 
-                var viewport = Bounds.Height - HexViewer.HEADER_HEIGHT - 26;
-                var offset = Math.Floor(idx / (double)HexViewer.BYTES_PER_LINE) * HexViewer.LINE_HEIGHT - (viewport * 0.5);
+                var offset = Math.Floor(idx / (double)HexViewer.BYTES_PER_LINE) * HexViewer.LINE_HEIGHT - (scroller.ViewportSize * 0.5);
                 scroller.Value = Math.Max(0, offset);
 
                 var viewer = this.FindDescendantOfType<HexViewer>(false);