58 lines
1.8 KiB
C#
58 lines
1.8 KiB
C#
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using System;
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using System.Collections.Generic;
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using PCL.Core.Logging;
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namespace PCL.Core.App.Localization;
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public static class WeakLanguageChanged
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{
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private static readonly object _Lock = new();
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private static readonly List<(WeakReference<object> Target, Action<object> Handler)> _Handlers = [];
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private static bool _hooked;
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public static void Add<T>(T target, Action<T> handler) where T : class
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{
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if (target is null) throw new ArgumentNullException(nameof(target));
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if (handler is null) throw new ArgumentNullException(nameof(handler));
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if (handler.Target is not null)
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throw new ArgumentException(
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"handler 必须是不捕获实例的静态委托，请改用形如 static t => t.Foo() 的写法并通过 target 传入实例。",
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nameof(handler));
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lock (_Lock)
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{
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if (!_hooked)
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{
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LocalizationService.LanguageChanged += _OnLanguageChanged;
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_hooked = true;
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}
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_Handlers.Add((new WeakReference<object>(target), o => handler((T)o)));
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}
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}
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private static void _OnLanguageChanged()
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{
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(WeakReference<object> Target, Action<object> Handler)[] snapshot;
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lock (_Lock)
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{
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_Handlers.RemoveAll(h => !h.Target.TryGetTarget(out _));
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snapshot = _Handlers.ToArray();
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}
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foreach (var (target, handler) in snapshot)
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{
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if (!target.TryGetTarget(out var t))
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continue;
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try
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{
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handler(t);
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}
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catch (Exception ex)
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{
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LogWrapper.Warn(ex, "WeakLanguageChanged", "语言变更处理器执行出错");
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}
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}
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}
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}
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