fix: avoid NRE

love-linger · love-linger · commit f45bed6f92d0 · 2024-11-19T10:31:17.000+08:00
Signed-off-by: leo &lt;longshuang@msn.cn&gt;
diff --git a/src/Views/TextDiffView.axaml.cs b/src/Views/TextDiffView.axaml.cs
@@ -1089,7 +1089,7 @@ public class SingleSideTextDiffPresenter : ThemedTextDiffPresenter
         public void ForceSyncScrollOffset()
         {
             if (DataContext is ViewModels.TwoSideTextDiff diff)
-                diff.SyncScrollOffset = _scrollViewer.Offset;
+                diff.SyncScrollOffset = _scrollViewer?.Offset ?? Vector.Zero;
         }
 
         public override List<Models.TextDiffLine> GetLines()
@@ -1302,7 +1302,7 @@ private void OnTextViewScrollGotFocus(object sender, GotFocusEventArgs e)
         private void OnTextViewScrollChanged(object sender, ScrollChangedEventArgs e)
         {
             if (TextArea.IsFocused && DataContext is ViewModels.TwoSideTextDiff diff)
-                diff.SyncScrollOffset = _scrollViewer.Offset;
+                diff.SyncScrollOffset = _scrollViewer?.Offset ?? Vector.Zero;
         }
 
         private void OnTextAreaPointerWheelChanged(object sender, PointerWheelEventArgs e)

Original file line number	Diff line number	Diff line change
`@@ -1089,7 +1089,7 @@ public class SingleSideTextDiffPresenter : ThemedTextDiffPresenter`
`1089`	`1089`	`public void ForceSyncScrollOffset()`
`1090`	`1090`	`{`
`1091`	`1091`	`if (DataContext is ViewModels.TwoSideTextDiff diff)`
`1092`		`- diff.SyncScrollOffset = _scrollViewer.Offset;`
	`1092`	`+ diff.SyncScrollOffset = _scrollViewer?.Offset ?? Vector.Zero;`
`1093`	`1093`	`}`
`1094`	`1094`
`1095`	`1095`	`public override List<Models.TextDiffLine> GetLines()`
`@@ -1302,7 +1302,7 @@ private void OnTextViewScrollGotFocus(object sender, GotFocusEventArgs e)`
`1302`	`1302`	`private void OnTextViewScrollChanged(object sender, ScrollChangedEventArgs e)`
`1303`	`1303`	`{`
`1304`	`1304`	`if (TextArea.IsFocused && DataContext is ViewModels.TwoSideTextDiff diff)`
`1305`		`- diff.SyncScrollOffset = _scrollViewer.Offset;`
	`1305`	`+ diff.SyncScrollOffset = _scrollViewer?.Offset ?? Vector.Zero;`
`1306`	`1306`	`}`
`1307`	`1307`
`1308`	`1308`	`private void OnTextAreaPointerWheelChanged(object sender, PointerWheelEventArgs e)`