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40 lines
1.7 KiB
40 lines
1.7 KiB
using System;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Components;
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namespace Connected
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{
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/// <summary>
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/// This class enables calling events as Non-rendering
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/// https://learn.microsoft.com/en-us/aspnet/core/blazor/performance?view=aspnetcore-6.0#avoid-rerendering-after-handling-events-without-state-changes
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/// </summary>
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public static class EventUtil
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{
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public static Action AsNonRenderingEventHandler(Action callback)
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=> new SyncReceiver(callback).Invoke;
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public static Action<TValue> AsNonRenderingEventHandler<TValue>(
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Action<TValue> callback)
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=> new SyncReceiver<TValue>(callback).Invoke;
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public static Func<Task> AsNonRenderingEventHandler(Func<Task> callback)
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=> new AsyncReceiver(callback).Invoke;
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public static Func<TValue, Task> AsNonRenderingEventHandler<TValue>(
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Func<TValue, Task> callback)
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=> new AsyncReceiver<TValue>(callback).Invoke;
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private record SyncReceiver(Action callback)
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: ReceiverBase { public void Invoke() => callback(); }
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private record SyncReceiver<T>(Action<T> callback)
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: ReceiverBase { public void Invoke(T arg) => callback(arg); }
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private record AsyncReceiver(Func<Task> callback)
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: ReceiverBase { public Task Invoke() => callback(); }
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private record AsyncReceiver<T>(Func<T, Task> callback)
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: ReceiverBase { public Task Invoke(T arg) => callback(arg); }
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private record ReceiverBase : IHandleEvent
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{
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public Task HandleEventAsync(EventCallbackWorkItem item, object arg) =>
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item.InvokeAsync(arg);
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}
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}
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} |