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117 lines
4.1 KiB
C#
117 lines
4.1 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text.Json;
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using Microsoft.JSInterop;
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namespace AntDesign.JsInterop
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{
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public class DomEventService
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{
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private ConcurrentDictionary<string, List<DomEventSubscription>> _domEventListeners = new ConcurrentDictionary<string, List<DomEventSubscription>>();
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private readonly IJSRuntime _jsRuntime;
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public DomEventService(IJSRuntime jsRuntime)
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{
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_jsRuntime = jsRuntime;
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}
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private void AddEventListenerToFirstChildInternal<T>(object dom, string eventName, Action<T> callback)
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{
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if (!_domEventListeners.ContainsKey(FormatKey(dom, eventName)))
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{
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_jsRuntime.InvokeAsync<string>(JSInteropConstants.AddDomEventListenerToFirstChild, dom, eventName, DotNetObjectReference.Create(new Invoker<T>((p) =>
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{
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callback?.Invoke(p);
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})));
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}
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}
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public void AddEventListener(object dom, string eventName, Action<JsonElement> callback, bool exclusive = true)
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{
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AddEventListener<JsonElement>(dom, eventName, callback, exclusive);
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}
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public void AddEventListener<T>(object dom, string eventName, Action<T> callback, bool exclusive = true)
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{
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if (exclusive)
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{
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_jsRuntime.InvokeAsync<string>(JSInteropConstants.AddDomEventListener, dom, eventName, DotNetObjectReference.Create(new Invoker<T>((p) =>
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{
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callback(p);
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})));
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}
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else
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{
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string key = FormatKey(dom, eventName);
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if (!_domEventListeners.ContainsKey(key))
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{
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_domEventListeners[key] = new List<DomEventSubscription>();
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_jsRuntime.InvokeAsync<string>(JSInteropConstants.AddDomEventListener, dom, eventName, DotNetObjectReference.Create(new Invoker<string>((p) =>
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{
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for (var i = 0; i < _domEventListeners[key].Count; i++)
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{
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var subscription = _domEventListeners[key][i];
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object tP = JsonSerializer.Deserialize(p, subscription.Type);
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subscription.Delegate.DynamicInvoke(tP);
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}
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})));
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}
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_domEventListeners[key].Add(new DomEventSubscription(callback, typeof(T)));
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}
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}
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public void AddEventListenerToFirstChild(object dom, string eventName, Action<JsonElement> callback)
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{
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AddEventListenerToFirstChildInternal<string>(dom, eventName, (e) =>
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{
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JsonElement jsonElement = JsonDocument.Parse(e).RootElement;
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callback(jsonElement);
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});
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}
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public void AddEventListenerToFirstChild<T>(object dom, string eventName, Action<T> callback)
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{
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AddEventListenerToFirstChildInternal<string>(dom, eventName, (e) =>
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{
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T obj = JsonSerializer.Deserialize<T>(e);
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callback(obj);
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});
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}
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private static string FormatKey(object dom, string eventName) => $"{dom}-{eventName}";
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public void RemoveEventListerner<T>(object dom, string eventName, Action<T> callback)
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{
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string key = FormatKey(dom, eventName);
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if (_domEventListeners.ContainsKey(key))
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{
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var subscription = _domEventListeners[key].SingleOrDefault(s => s.Delegate == (Delegate)callback);
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if (subscription != null)
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{
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_domEventListeners[key].Remove(subscription);
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}
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}
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}
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}
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public class Invoker<T>
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{
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private Action<T> _action;
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public Invoker(Action<T> invoker)
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{
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this._action = invoker;
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}
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[JSInvokable]
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public void Invoke(T param)
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{
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_action.Invoke(param);
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}
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}
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}
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