improve:自动更新

2026-02-12 17:22:47 +08:00
parent 200317a0f5
commit 376790330d
7 changed files with 99 additions and 12 deletions
@@ -92,6 +92,11 @@ namespace Ink_Canvas.Helpers

        public TimeMachineHistory Undo()
        {
+            if (_currentIndex < 0 || _currentIndex >= _currentStrokeHistory.Count)
+            {
+                return null;
+            }
+
            var item = _currentStrokeHistory[_currentIndex];
            item.StrokeHasBeenCleared = !item.StrokeHasBeenCleared;
            _currentIndex--;
@@ -102,6 +107,11 @@ namespace Ink_Canvas.Helpers

        public TimeMachineHistory Redo()
        {
+            if (_currentStrokeHistory.Count == 0 || _currentIndex >= _currentStrokeHistory.Count - 1)
+            {
+                return null;
+            }
+
            var item = _currentStrokeHistory[++_currentIndex];
            item.StrokeHasBeenCleared = !item.StrokeHasBeenCleared;
            NotifyUndoRedoState();