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OrderedEvent.cs
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OrderedEvent.cs
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using System;
using System.Collections.Generic;
namespace OrderedEvents
{
public class OrderedAction<TEventArgs> : IComparable<OrderedAction<TEventArgs>>
{
public const int DEFAULT_EXECUTION_POS = OrderedEvent<TEventArgs>.DEFAULT_EXECUTION_POS;
// The event this action is subscribed too.
public OrderedEvent<TEventArgs>? Subscription = null;
public Action<object, TEventArgs>? BaseAct = null;
private int exeOrder = DEFAULT_EXECUTION_POS;
public int ExecutionOrder
{
get => exeOrder;
set
{
exeOrder = value;
if (Subscription != null) { Subscription.orderDirty = true; }
}
}
public int CompareTo(OrderedAction<TEventArgs>? ordAct)
{
if (ordAct == null) throw new NullReferenceException("Cannot compare an OrderedAction to null!");
if (exeOrder > ordAct.ExecutionOrder) return 1;
if (exeOrder < ordAct.ExecutionOrder) return -1;
return 0;
}
public OrderedAction(Action<object, TEventArgs> func, OrderedEvent<TEventArgs> subscribedToo, int orderOfExe = DEFAULT_EXECUTION_POS)
{
BaseAct = func;
Subscription = subscribedToo;
exeOrder = orderOfExe;
}
public OrderedAction(Action<object, TEventArgs> func) { BaseAct = func; }
public OrderedAction() { }
}
public class OrderedEvent<TEventArgs>
{
public const int DEFAULT_EXECUTION_POS = 0;
public bool disabled = true;
public bool orderDirty = false;
public List<OrderedAction<TEventArgs>> OrderedActs = new(32);
public OrderedEvent() { }
public OrderedAction<TEventArgs>? GetOrderedAction(Action<object, TEventArgs> target)
{
Action<object, TEventArgs>? currAct;
for (int i = 0, ct = OrderedActs.Count; i < ct; ++i)
{
currAct = OrderedActs[i].BaseAct;
if (currAct == null)
throw new NullReferenceException($"OrderedAction cannot be null!");
if (currAct.Equals(target)) return OrderedActs[i];
}
return null;
}
public void Sort()
{
OrderedActs.Sort();
orderDirty = false;
}
public void Raise(object obj, TEventArgs eventArgs)
{
if (disabled) return;
if (orderDirty) Sort();
OrderedAction<TEventArgs> currAct;
for (int i = 0, ct = OrderedActs.Count; i < ct; ++i)
{
currAct = OrderedActs[i];
if (currAct == null || currAct.BaseAct == null) continue;
currAct.BaseAct(obj, eventArgs);
}
}
public void Push(OrderedAction<TEventArgs> OrdAct)
{
if (OrdAct == null)
throw new NullReferenceException($"OrderedAction cannot be null!");
OrdAct.Subscription = this;
OrderedActs.Insert(0, OrdAct);
}
public void Add(OrderedAction<TEventArgs> OrdAct)
{
if (OrdAct == null)
throw new NullReferenceException($"OrderedAction cannot be null!");
OrdAct.Subscription = this;
OrderedActs.Add(OrdAct);
}
public void Insert(OrderedAction<TEventArgs> OrdAct)
{
if (OrdAct == null)
throw new NullReferenceException($"OrderedAction cannot be null!");
OrderedActs.Add(OrdAct);
orderDirty = true;
}
/// <summary>
///
/// Pushes action onto the top of the execution stack.
/// Will be executed first unless it is superceded after push.
///
/// </summary>
///
/// <param name="Act">Action you wish to execute when event is raised.</param>
///
/// <exception cref="NullReferenceException">Throws if passed Action is null.</exception>
public void Push(Action<object, TEventArgs> Act)
{
if (Act == null)
throw new NullReferenceException($"Action cannot be null!");
OrderedActs.Insert(0, new OrderedAction<TEventArgs>(Act, this, OrderedActs[0].ExecutionOrder - 1));
}
/// <summary>
///
/// Adds action to the bottom of the execution stack.
/// Will be executed last unless some other function is added after call.
///
/// </summary>
///
/// <param name="Act">Action you wish to execute when event is raised.</param>
///
/// <exception cref="NullReferenceException">Throws if passed Action is null.</exception>
public void Add(Action<object, TEventArgs> Act)
{
if (Act == null)
throw new NullReferenceException($"Action cannot be null!");
OrderedActs.Add(new OrderedAction<TEventArgs>(Act, this));
}
/// <summary>
///
/// Adds an action to be executed at the specified execution position.
///
/// </summary>
///
/// <param name="Act">Action you wish to execute when event is raised.</param>
/// <param name="desiredOrder">Position of execution.</param>
///
/// <exception cref="NullReferenceException">Throws if passed Action is null.</exception>
public void Insert(Action<object, TEventArgs> Act, int desiredOrder)
{
if (Act == null)
throw new NullReferenceException($"Action cannot be null!");
OrderedActs.Add(new OrderedAction<TEventArgs>(Act, this, desiredOrder));
orderDirty = true;
}
public static OrderedEvent<TEventArgs> operator +(OrderedEvent<TEventArgs> lhs, OrderedAction<TEventArgs> rhs)
{
if (rhs == null)
throw new NullReferenceException($"OrderedAction cannot be null!");
lhs.Insert(rhs);
return lhs;
}
public static OrderedEvent<TEventArgs> operator +(OrderedEvent<TEventArgs> lhs, Action<object, TEventArgs> rhs)
{
if (rhs == null)
throw new NullReferenceException($"Action cannot be null!");
lhs.Add(rhs);
return lhs;
}
public static OrderedEvent<TEventArgs> operator -(OrderedEvent<TEventArgs> lhs, OrderedAction<TEventArgs> rhs)
{
if (rhs == null) return lhs;
_ = lhs.OrderedActs.Remove(rhs);
return lhs;
}
public static OrderedEvent<TEventArgs> operator -(OrderedEvent<TEventArgs> lhs, Action<object, TEventArgs> rhs)
{
if (rhs == null) return lhs;
List<OrderedAction<TEventArgs>> acts = lhs.OrderedActs;
for (int i = 0, ct = acts.Count; i < ct; ++i)
{
if (rhs.Equals(acts[i].BaseAct))
{
acts.RemoveAt(i);
break;
}
}
return lhs;
}
public static OrderedEvent<TEventArgs> operator +(OrderedEvent<TEventArgs> lhs, OrderedEvent<TEventArgs> rhs)
{
if (rhs == null)
throw new NullReferenceException($"OrderedEvent cannot be null!");
List<OrderedAction<TEventArgs>> rhsActs = rhs.OrderedActs;
if (rhsActs.Count < 1 || rhs == lhs)
return lhs;
for(int i = 0, ct = rhsActs.Count; i < ct; ++i)
lhs += rhsActs[i];
lhs.orderDirty = true;
return lhs;
}
}
}