优化更新代码，添加界面功能并整合

WPFluent/Controls/NavigationView/NavigationView.TemplateParts.cs

@@ -0,0 +1,143 @@
+
+
+
+// Based on Windows UI Library
+// Copyright(c) Microsoft Corporation.All rights reserved.
+
+// ReSharper disable once CheckNamespace
+namespace WPFluent.Controls;
+
+/// <content>
+/// Defines the template parts for the <see cref="NavigationView"/> control
+/// </content>
+[TemplatePart(Name = TemplateElementNavigationViewContentPresenter, Type = typeof(NavigationViewContentPresenter)
+)]
+[TemplatePart(Name = TemplateElementMenuItemsItemsControl, Type = typeof(System.Windows.Controls.ItemsControl)
+)]
+[TemplatePart(Name = TemplateElementFooterMenuItemsItemsControl, Type = typeof(System.Windows.Controls.ItemsControl)
+)]
+[TemplatePart(Name = TemplateElementBackButton, Type = typeof(System.Windows.Controls.Button))]
+[TemplatePart(Name = TemplateElementToggleButton, Type = typeof(System.Windows.Controls.Button))]
+[TemplatePart(Name = TemplateElementAutoSuggestBoxSymbolButton, Type = typeof(System.Windows.Controls.Button)
+)]
+public partial class NavigationView
+{
+    /// <summary>
+    /// Template element represented by the <c>PART_AutoSuggestBoxSymbolButton</c> name.
+    /// </summary>
+    private const string TemplateElementAutoSuggestBoxSymbolButton = "PART_AutoSuggestBoxSymbolButton";
+
+    /// <summary>
+    /// Template element represented by the <c>PART_BackButton</c> name.
+    /// </summary>
+    private const string TemplateElementBackButton = "PART_BackButton";
+
+    /// <summary>
+    /// Template element represented by the <c>PART_FooterMenuItemsItemsControl</c> name.
+    /// </summary>
+    private const string TemplateElementFooterMenuItemsItemsControl = "PART_FooterMenuItemsItemsControl";
+
+    /// <summary>
+    /// Template element represented by the <c>PART_MenuItemsItemsControl</c> name.
+    /// </summary>
+    private const string TemplateElementMenuItemsItemsControl = "PART_MenuItemsItemsControl";
+    /// <summary>
+    /// Template element represented by the <c>PART_MenuItemsItemsControl</c> name.
+    /// </summary>
+    private const string TemplateElementNavigationViewContentPresenter =
+        "PART_NavigationViewContentPresenter";
+
+    /// <summary>
+    /// Template element represented by the <c>PART_ToggleButton</c> name.
+    /// </summary>
+    private const string TemplateElementToggleButton = "PART_ToggleButton";
+
+    protected T GetTemplateChild<T>(string name) where T : DependencyObject
+    {
+        if(GetTemplateChild(name) is not T dependencyObject)
+        {
+            throw new ArgumentNullException(name);
+        }
+
+        return dependencyObject;
+    }
+
+    /// <summary>
+    /// Gets or sets the control that is visitable if PaneDisplayMode="Left" and in compact state
+    /// </summary>
+    protected System.Windows.Controls.Button? AutoSuggestBoxSymbolButton { get; set; }
+
+    /// <summary>
+    /// Gets or sets the control located at the top of the pane with left arrow icon.
+    /// </summary>
+    protected System.Windows.Controls.Button? BackButton { get; set; }
+
+    /// <summary>
+    /// Gets or sets the control located at the top of the pane with hamburger icon.
+    /// </summary>
+    protected System.Windows.Controls.ItemsControl FooterMenuItemsItemsControl { get; set; } = null!;
+
+    /// <summary>
+    /// Gets or sets the control located at the top of the pane with left arrow icon.
+    /// </summary>
+    protected System.Windows.Controls.ItemsControl MenuItemsItemsControl { get; set; } = null!;
+
+    /// <summary>
+    /// Gets or sets the control responsible for rendering the content.
+    /// </summary>
+    protected NavigationViewContentPresenter NavigationViewContentPresenter { get; set; } = null!;
+
+    /// <summary>
+    /// Gets or sets the control located at the top of the pane with hamburger icon.
+    /// </summary>
+    protected System.Windows.Controls.Button? ToggleButton { get; set; }
+
+    /// <inheritdoc/>
+    public override void OnApplyTemplate()
+    {
+        base.OnApplyTemplate();
+
+        NavigationViewContentPresenter = GetTemplateChild<NavigationViewContentPresenter>(
+            TemplateElementNavigationViewContentPresenter);
+        MenuItemsItemsControl = GetTemplateChild<System.Windows.Controls.ItemsControl>(
+            TemplateElementMenuItemsItemsControl);
+        FooterMenuItemsItemsControl = GetTemplateChild<System.Windows.Controls.ItemsControl>(
+            TemplateElementFooterMenuItemsItemsControl);
+
+        MenuItemsItemsControl.SetCurrentValue(System.Windows.Controls.ItemsControl.ItemsSourceProperty, MenuItems);
+        FooterMenuItemsItemsControl.SetCurrentValue(
+            System.Windows.Controls.ItemsControl.ItemsSourceProperty,
+            FooterMenuItems);
+
+        if(NavigationViewContentPresenter is not null)
+        {
+            NavigationViewContentPresenter.Navigated -= OnNavigationViewContentPresenterNavigated;
+            NavigationViewContentPresenter.Navigated += OnNavigationViewContentPresenterNavigated;
+        }
+
+        if(GetTemplateChild(TemplateElementAutoSuggestBoxSymbolButton)
+            is System.Windows.Controls.Button autoSuggestBoxSymbolButton)
+        {
+            AutoSuggestBoxSymbolButton = autoSuggestBoxSymbolButton;
+
+            AutoSuggestBoxSymbolButton.Click -= AutoSuggestBoxSymbolButtonOnClick;
+            AutoSuggestBoxSymbolButton.Click += AutoSuggestBoxSymbolButtonOnClick;
+        }
+
+        if(GetTemplateChild(TemplateElementBackButton) is System.Windows.Controls.Button backButton)
+        {
+            BackButton = backButton;
+
+            BackButton.Click -= OnBackButtonClick;
+            BackButton.Click += OnBackButtonClick;
+        }
+
+        if(GetTemplateChild(TemplateElementToggleButton) is System.Windows.Controls.Button toggleButton)
+        {
+            ToggleButton = toggleButton;
+
+            ToggleButton.Click -= OnToggleButtonClick;
+            ToggleButton.Click += OnToggleButtonClick;
+        }
+    }
+}