优化布局管理和事件处理逻辑

- 修改 `DockContainer.cs` 中 `OnCollectionChanged` 方法，增加对 `IsListening` 的检查。
- 移除 `DockWindow.xaml.cs` 中的 `Panel.SaveLayout(panelWriter);` 调用。
- 在 `DockManager.xaml.cs` 中，将 `Unloaded` 事件处理从 `CloseAllWindows` 修改为 `CloseWindows`，并在清空侧边集合时保持一致。
- 调整 `WriteSideDocuments` 和 `ReadSideDocuments` 方法的参数顺序，以提高可读性和一致性。
- 重命名 `DockWindowHelpers.cs` 中的 `CloseAllWindows` 方法为 `CloseWindows`，以与其他方法保持一致。

Author: qian-o

src/WinUI.Dock/Abstracts/DockContainer.cs

@@ -58,12 +58,7 @@ protected override void OnRootChanged(DockManager? oldRoot, DockManager? newRoot
 
     private void OnCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
     {
-        if (!IsListening)
-        {
-            return;
-        }
-
-        if (ValidateChildren())
+        if (IsListening && ValidateChildren())
         {
             UnloadChildren();
 

src/WinUI.Dock/Controls/DockWindow.xaml.cs

@@ -34,7 +34,6 @@ internal void SaveLayout(JsonObject writer)
         };
 
         JsonObject panelWriter = [];
-
         Panel.SaveLayout(panelWriter);
 
         writer[nameof(Panel)] = panelWriter;

src/WinUI.Dock/DockManager.xaml.cs

@@ -41,7 +41,7 @@ public DockManager()
     {
         DefaultStyleKey = typeof(DockManager);
 
-        Unloaded += (_, _) => DockWindowHelpers.CloseAllWindows(this);
+        Unloaded += (_, _) => DockWindowHelpers.CloseWindows(this);
 
         LeftSide.CollectionChanged += OnSideCollectionChanged;
         TopSide.CollectionChanged += OnSideCollectionChanged;
@@ -91,7 +91,7 @@ public void ClearLayout()
         RightSide.Clear();
         BottomSide.Clear();
 
-        DockWindowHelpers.CloseAllWindows(this);
+        DockWindowHelpers.CloseWindows(this);
     }
 
     public string SaveLayout()
@@ -106,10 +106,10 @@ public string SaveLayout()
             writer[nameof(Panel)] = panelWriter;
         }
 
-        writer.WriteSideDocuments(LeftSide, nameof(LeftSide));
-        writer.WriteSideDocuments(TopSide, nameof(TopSide));
-        writer.WriteSideDocuments(RightSide, nameof(RightSide));
-        writer.WriteSideDocuments(BottomSide, nameof(BottomSide));
+        writer.WriteSideDocuments(nameof(LeftSide), LeftSide);
+        writer.WriteSideDocuments(nameof(TopSide), TopSide);
+        writer.WriteSideDocuments(nameof(RightSide), RightSide);
+        writer.WriteSideDocuments(nameof(BottomSide), BottomSide);
 
         JsonArray windows = [];
 
@@ -141,22 +141,22 @@ public void LoadLayout(string layout)
 
         if (reader.ContainsKey(nameof(Panel)))
         {
-            Panel = new() { Root = this };
+            Panel = new();
             Panel.LoadLayout(reader[nameof(Panel)]!.AsObject());
 
             InvokeCreateNewDocument(Panel.Children);
         }
 
-        reader.ReadSideDocuments(LeftSide, nameof(LeftSide));
+        reader.ReadSideDocuments(nameof(LeftSide), LeftSide);
         InvokeCreateNewDocument(LeftSide);
 
-        reader.ReadSideDocuments(TopSide, nameof(TopSide));
+        reader.ReadSideDocuments(nameof(TopSide), TopSide);
         InvokeCreateNewDocument(TopSide);
 
-        reader.ReadSideDocuments(RightSide, nameof(RightSide));
+        reader.ReadSideDocuments(nameof(RightSide), RightSide);
         InvokeCreateNewDocument(RightSide);
 
-        reader.ReadSideDocuments(BottomSide, nameof(BottomSide));
+        reader.ReadSideDocuments(nameof(BottomSide), BottomSide);
         InvokeCreateNewDocument(BottomSide);
 
         foreach (JsonObject windowReader in reader["Windows"]!.AsArray().Cast<JsonObject>())

src/WinUI.Dock/Helpers/DockWindowHelpers.cs

@@ -34,7 +34,7 @@ public static DockWindow[] GetWindows(DockManager manager)
         return windows.TryGetValue(manager, out List<DockWindow>? value) ? [.. value] : [];
     }
 
-    public static void CloseAllWindows(DockManager manager)
+    public static void CloseWindows(DockManager manager)
     {
         if (windows.TryGetValue(manager, out List<DockWindow>? value))
         {

src/WinUI.Dock/Helpers/LayoutHelpers.cs

@@ -85,7 +85,7 @@ public static void ReadDockContainerChildren(this JsonObject reader, DockContain
         }
     }
 
-    public static void WriteSideDocuments(this JsonObject writer, ObservableCollection<Document> side, string sideName)
+    public static void WriteSideDocuments(this JsonObject writer, string sideName, ObservableCollection<Document> side)
     {
         JsonArray documents = [];
 
@@ -100,7 +100,7 @@ public static void WriteSideDocuments(this JsonObject writer, ObservableCollecti
         writer[sideName] = documents;
     }
 
-    public static void ReadSideDocuments(this JsonObject reader, ObservableCollection<Document> side, string sideName)
+    public static void ReadSideDocuments(this JsonObject reader, string sideName, ObservableCollection<Document> side)
     {
         foreach (JsonObject documentReader in reader[sideName]!.AsArray().Cast<JsonObject>())
         {