修复bug+清理

Assets/Scripts/Game/EditorCore/GameElements_Editor/Essential/ElementFolder_Editor.cs

@@ -128,37 +128,75 @@ namespace Ichni.RhythmGame
             ApplyTimeShiftToElement(this, affectNotes, offset);
         }
 
+        /// <summary>
+        /// 递归偏移元素及其所有子元素的时间参数。
+        /// 处理顺序：先偏移当前元素，再递归处理子元素。
+        /// </summary>
         private void ApplyTimeShiftToElement(GameElement element, bool affectNotes, float offset)
         {
-            if (element is AnimationBase anim)
+            try
             {
-                anim.ApplyTimeOffset(offset);
-                anim.Refresh();
-            }
-            else if (element is NoteBase note && affectNotes)
-            {
-                note.exactJudgeTime += offset;
-                if (note is Hold hold)
+                if (element == null) return;
+
+                switch (element)
                 {
-                    hold.holdEndTime += offset;
+                    case AnimationBase anim:
+                        anim.ApplyTimeOffset(offset);
+                        anim.Refresh();
+                        break;
+
+                    case NoteBase note when affectNotes:
+                        note.exactJudgeTime += offset;
+                        if (note is Hold hold)
+                        {
+                            hold.holdEndTime += offset;
+                        }
+                        note.UpdateNoteInTrack(EditorManager.instance.songInformation.songTime);
+                        note.AddinNoteManager(false);
+                        note.Refresh();
+                        break;
+
+                    case Track track:
+                        // 偏移 Track 自身的 timeDurationSubmodule
+                        if (track.timeDurationSubmodule != null && track.timeDurationSubmodule.isOverridingDuration)
+                        {
+                            track.timeDurationSubmodule.startTime += offset;
+                            track.timeDurationSubmodule.endTime += offset;
+                        }
+                        // 偏移 TrackTimeSubmodule 中的轨道起止时间
+                        if (track.trackTimeSubmodule is TrackTimeSubmoduleMovable movable)
+                        {
+                            movable.trackStartTime += offset;
+                            movable.trackEndTime += offset;
+                            movable.Refresh();
+                        }
+                        track.Refresh();
+                        break;
+
+                    case DTMTrail dtmTrail:
+                        dtmTrail.ApplyTimeOffset(offset);
+                        dtmTrail.Refresh();
+                        break;
+
+                    // 泛型兜底：处理 TemporaryObject、ParticleEmitter、GameCamera、TimeEffectsCollection 等
+                    // 所有实现了 IHaveTimeDurationSubmodule 但不属于上述类型的元素
+                    case IHaveTimeDurationSubmodule hasDuration:
+                        hasDuration.ApplyTimeOffset(offset);
+                        break;
                 }
-                
-                note.UpdateNoteInTrack(EditorManager.instance.songInformation.songTime);
-                note.AddinNoteManager(false);
-                note.Refresh();
             }
-            else if (element is DTMTrail dtmTrail)
+            catch (System.Exception ex)
             {
-                dtmTrail.ApplyTimeOffset(offset);
-                dtmTrail.Refresh();
+                Debug.LogError($"[TimeShift] 处理元素 '{element?.elementName}' ({element?.GetType().Name}) 时出错: {ex.Message}\n{ex.StackTrace}");
             }
 
-            // GameElement 本身具有层级结构，所有的 GameElement 都可能会携带子物体（如 EnvironmentObject，Track 等等）
+            // 使用快照副本进行安全迭代，防止子操作意外修改集合
             if (element.childElementList != null && element.childElementList.Count > 0)
             {
-                foreach (var child in element.childElementList)
+                List<GameElement> snapshot = new List<GameElement>(element.childElementList);
+                for (int i = 0; i < snapshot.Count; i++)
                 {
-                    ApplyTimeShiftToElement(child, affectNotes, offset);
+                    ApplyTimeShiftToElement(snapshot[i], affectNotes, offset);
                 }
             }
         }

Assets/Scripts/Game/RuntimeCore/GameElements/Essential/SubstantialObject.cs

@@ -52,9 +52,17 @@ namespace Ichni.RhythmGame
             colorSubmodule = new ColorSubmodule(this);
         }
 
+        /// <summary>
+        /// 施加时间偏移。直接操作 timeDurationSubmodule，
+        /// 不通过 interface cast 委托，避免 C# default interface method 虚分派导致无限递归。
+        /// </summary>
         public virtual void ApplyTimeOffset(float offset)
         {
-            (this as IHaveTimeDurationSubmodule).ApplyTimeOffset(offset);
+            if (timeDurationSubmodule != null)
+            {
+                timeDurationSubmodule.startTime += offset;
+                timeDurationSubmodule.endTime += offset;
+            }
         }
 
         #endregion