137 lines
5.1 KiB
C#
137 lines
5.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using System.Windows;
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using System.Windows.Media;
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using System.Windows.Media.Animation;
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namespace Sample
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{
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public enum ThemeMode { Light, Dark }
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/// <summary>
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/// 一个优雅且绝对可靠的主题管理器。
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/// 它通过一个明确的资源键列表，精确地对指定画刷进行平滑的过渡动画。
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/// </summary>
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public static class HybridThemeManager
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{
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// 【契约】我们回归到使用一个明确的、硬编码的列表。
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// 这是最可靠的方式，它清晰地定义了哪些资源参与动画。
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private static readonly List<string> AnimatableBrushKeys = new List<string>
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{
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//"AppBackgroundBrush",
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//"AppTextBrush"
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};
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static HybridThemeManager()
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{
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var appResources = Application.Current.Resources;
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foreach (var dict in appResources.MergedDictionaries)
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{
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var keys = dict.Keys;
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//AnimatableBrushKeys.Clear();
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AnimatableBrushKeys.AddRange(
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keys.OfType<string>()
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.Where(key => key.EndsWith("Brush") && dict[key] is SolidColorBrush)
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);
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}
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//foreach (ResourceDictionary dict in appResources)
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//{
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//}
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}
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private static ThemeMode _currentMode = ThemeMode.Light;
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private static bool _isSwitching = false;
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public static async Task SwitchThemeAsync()
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{
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if (_isSwitching) return;
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_isSwitching = true;
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try
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{
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var targetMode = _currentMode == ThemeMode.Light ? ThemeMode.Dark : ThemeMode.Light;
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var appResources = Application.Current.Resources;
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// 步骤 1: “快照” - 根据【明确的列表】，记录当前颜色
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var fromColors = TakeColorSnapshot(appResources);
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// 步骤 2: “交换” - 替换资源字典
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SwapThemeDictionary(appResources, targetMode);
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// 步骤 3: “动画” - 对【明确的列表】中的画刷启动动画
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await AnimateToNewTheme(appResources, fromColors);
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_currentMode = targetMode;
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}
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finally
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{
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_isSwitching = false;
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}
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}
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private static Dictionary<string, Color> TakeColorSnapshot(ResourceDictionary resources)
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{
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return AnimatableBrushKeys
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.Where(key => resources.Contains(key) && resources[key] is SolidColorBrush)
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.ToDictionary(key => key, key => ((SolidColorBrush)resources[key]).Color);
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}
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private static void SwapThemeDictionary(ResourceDictionary resources, ThemeMode targetMode)
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{
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var newThemeUri = new Uri($"/Themes/{targetMode}.xaml", UriKind.Relative);
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var newThemeDict = new ResourceDictionary { Source = newThemeUri };
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var oldDict = resources.MergedDictionaries.FirstOrDefault(d => d.Source?.OriginalString.Contains("/Themes/") ?? false);
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if (oldDict != null)
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{
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resources.MergedDictionaries.Remove(oldDict);
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}
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resources.MergedDictionaries.Add(newThemeDict);
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}
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private static Task AnimateToNewTheme(ResourceDictionary resources, IReadOnlyDictionary<string, Color> fromColors)
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{
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var animationTasks = new List<Task>();
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foreach (var key in AnimatableBrushKeys)
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{
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if (resources.Contains(key) && resources[key] is SolidColorBrush newBrush && fromColors.TryGetValue(key, out var fromColor))
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{
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// 【健壮性】依然保留对 StaticResource (冻结) 的处理
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if (newBrush.IsFrozen)
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{
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newBrush = newBrush.Clone();
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resources[key] = newBrush;
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}
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var toColor = newBrush.Color;
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newBrush.Color = fromColor; // 伪装
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animationTasks.Add(AnimateBrushColorAsync(newBrush, toColor));
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}
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}
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return Task.WhenAll(animationTasks);
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}
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private static Task AnimateBrushColorAsync(SolidColorBrush brush, Color toColor)
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{
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var tcs = new TaskCompletionSource<bool>();
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var animation = new ColorAnimation
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{
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From = brush.Color,
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To = toColor,
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Duration = TimeSpan.FromMilliseconds(400),
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EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
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};
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animation.Completed += (s, e) =>
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{
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brush.BeginAnimation(SolidColorBrush.ColorProperty, null);
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brush.Color = toColor;
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tcs.TrySetResult(true);
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};
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brush.BeginAnimation(SolidColorBrush.ColorProperty, animation);
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return tcs.Task;
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}
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}
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} |