更新整理

WPFluent.Gallery/ViewModels/Pages/SettingsViewModel.cs

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+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System.Reflection;
+using System.Windows.Media;
+
+using WPFluent.Appearance;
+using WPFluent.Controls;
+using WPFluent.Extensions;
+
+namespace WPFluent.Gallery.ViewModels.Pages;
+
+public sealed partial class SettingsViewModel(INavigationService navigationService) : ViewModel
+{
+    private bool _isInitialized = false;
+
+    [ObservableProperty]
+    private string _appVersion = string.Empty;
+
+    [ObservableProperty]
+    private ApplicationTheme _currentApplicationTheme = ApplicationTheme.Unknown;
+
+    [ObservableProperty]
+    private NavigationViewPaneDisplayMode _currentApplicationNavigationStyle =
+        NavigationViewPaneDisplayMode.Left;
+
+    public override void OnNavigatedTo()
+    {
+        if (!_isInitialized)
+        {
+            InitializeViewModel();
+        }
+    }
+
+    partial void OnCurrentApplicationThemeChanged(ApplicationTheme oldValue, ApplicationTheme newValue)
+    {
+        ApplicationThemeManager.Apply(newValue);
+    }
+
+    partial void OnCurrentApplicationNavigationStyleChanged(
+        NavigationViewPaneDisplayMode oldValue,
+        NavigationViewPaneDisplayMode newValue
+    )
+    {
+        _ = navigationService.SetPaneDisplayMode(newValue);
+    }
+
+    private void InitializeViewModel()
+    {
+        CurrentApplicationTheme = ApplicationThemeManager.GetAppTheme();
+        AppVersion = $"{GetAssemblyVersion()}";
+
+        ApplicationThemeManager.Changed += OnThemeChanged;
+
+        _isInitialized = true;
+    }
+
+    private void OnThemeChanged(ApplicationTheme currentApplicationTheme, Color systemAccent)
+    {
+        // Update the theme if it has been changed elsewhere than in the settings.
+        if (CurrentApplicationTheme != currentApplicationTheme)
+        {
+            CurrentApplicationTheme = currentApplicationTheme;
+        }
+    }
+
+    private static string GetAssemblyVersion()
+    {
+        return Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? string.Empty;
+    }
+}