Ooui-tws-port/Ooui/EventTarget.cs

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6.5 KiB
C#
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using System;
using System.Collections.Generic;
using System.Linq;
namespace Ooui
{
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[Newtonsoft.Json.JsonConverter (typeof (EventTargetJsonConverter))]
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public abstract class EventTarget
{
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readonly List<Message> stateMessages = new List<Message> ();
readonly Dictionary<string, List<EventHandler>> eventListeners =
new Dictionary<string, List<EventHandler>> ();
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public string Id { get; private set; } = GenerateId ();
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public string TagName { get; private set; }
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public event Action<Message> MessageSent;
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public IReadOnlyList<Message> StateMessages {
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get {
lock (stateMessages) {
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return new List<Message> (stateMessages).AsReadOnly ();
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}
}
}
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protected EventTarget (string tagName)
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{
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TagName = tagName;
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Send (new Message {
MessageType = MessageType.Create,
TargetId = Id,
Key = TagName,
});
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}
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public override string ToString() => $"<{TagName} id=\"{Id}\" />";
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public virtual EventTarget GetElementById (string id)
{
if (id == Id) return this;
return null;
}
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public void AddEventListener (string eventType, EventHandler handler)
{
if (eventType == null) return;
if (handler == null) return;
var sendListen = false;
List<EventHandler> handlers;
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lock (eventListeners) {
if (!eventListeners.TryGetValue (eventType, out handlers)) {
handlers = new List<EventHandler> ();
eventListeners[eventType] = handlers;
sendListen = true;
}
handlers.Add (handler);
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}
if (sendListen)
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Send (new Message {
MessageType = MessageType.Listen,
TargetId = Id,
Key = eventType,
});
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}
public void RemoveEventListener (string eventType, EventHandler handler)
{
if (eventType == null) return;
if (handler == null) return;
List<EventHandler> handlers;
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lock (eventListeners) {
if (eventListeners.TryGetValue (eventType, out handlers)) {
handlers.Remove (handler);
}
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}
}
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protected bool SetProperty<T> (ref T backingStore, T newValue, string attributeName, [System.Runtime.CompilerServices.CallerMemberName] string propertyName = "")
{
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if (EqualityComparer<T>.Default.Equals (backingStore, newValue))
return false;
backingStore = newValue;
SendSet (attributeName, newValue);
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OnPropertyChanged (propertyName);
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return true;
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}
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protected virtual void OnPropertyChanged (string propertyName)
{
}
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public const char IdPrefix = '\u2999';
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static long idCounter = 0;
static string GenerateId ()
{
var id = System.Threading.Interlocked.Increment (ref idCounter);
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return $"{IdPrefix}{id}";
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}
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public void Send (Message message)
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{
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if (message == null)
return;
if (message.TargetId == Id)
SaveStateMessageIfNeeded (message);
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MessageSent?.Invoke (message);
}
protected void SendCall (string methodName, params object[] args)
{
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Send (Message.Call (Id, methodName, args));
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}
protected void SendSet (string attributeName, object value)
{
Send (new Message {
MessageType = MessageType.Set,
TargetId = Id,
Key = attributeName,
Value = value,
});
}
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public void Receive (Message message)
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{
if (message == null)
return;
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if (message.TargetId == Id)
SaveStateMessageIfNeeded (message);
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TriggerEventFromMessage (message);
}
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protected void AddStateMessage (Message message)
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{
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lock (stateMessages) stateMessages.Add (message);
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}
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protected void UpdateStateMessages (Action<List<Message>> updater)
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{
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lock (stateMessages) updater (stateMessages);
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}
protected virtual void SaveStateMessageIfNeeded (Message message)
{
switch (message.MessageType) {
case MessageType.Create:
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AddStateMessage (message);
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break;
case MessageType.Set:
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UpdateStateMessages (state => {
state.RemoveAll (x => x.MessageType == MessageType.Set && x.Key == message.Key);
state.Add (message);
});
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break;
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case MessageType.Listen:
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AddStateMessage (message);
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break;
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}
}
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protected virtual bool TriggerEventFromMessage (Message message)
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{
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if (message.TargetId != Id)
return false;
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List<EventHandler> handlers = null;
lock (eventListeners) {
List<EventHandler> hs;
if (eventListeners.TryGetValue (message.Key, out hs)) {
handlers = new List<EventHandler> (hs);
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}
}
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if (handlers == null) return true;
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var args = EventArgs.Empty;
foreach (var h in handlers) {
h.Invoke (this, args);
}
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return true;
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}
}
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class EventTargetJsonConverter : Newtonsoft.Json.JsonConverter
{
public override bool CanRead => false;
public override void WriteJson (Newtonsoft.Json.JsonWriter writer, object value, Newtonsoft.Json.JsonSerializer serializer)
{
writer.WriteValue (((EventTarget)value).Id);
}
public override object ReadJson (Newtonsoft.Json.JsonReader reader, Type objectType, object existingValue, Newtonsoft.Json.JsonSerializer serializer)
{
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throw new NotSupportedException ();
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}
public override bool CanConvert (Type objectType)
{
return typeof (EventTarget).IsAssignableFrom (objectType);
}
}
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}