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Subscriber.cs
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172 lines (146 loc) · 5.5 KB
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using System;
using System.Collections.Generic;
using UnityEngine;
namespace UnityEventBus
{
/// <summary> Base class for EventListener & Listener MonoBehavior </summary>
public abstract class Subscriber : MonoBehaviour, ISubscriber, ISubscriberOptions
{
[SerializeField] [Tooltip("Subscription targets")]
private SubscriptionTarget m_SubscribeTo = SubscriptionTarget.FirstParent;
[SerializeField] [Tooltip("Listener priority, lowest first, same last")]
private int m_Priority;
private bool m_Connected;
private List<IEventBus> m_Buses = new List<IEventBus>();
public List<IEventBus> Subscriptions => m_Buses;
public string Name => gameObject.name;
public int Priority
{
get => m_Priority;
set
{
if (m_Priority == value)
return;
m_Priority = value;
// reconnect if order was changed
if (m_Connected)
{
_disconnectListener();
_connectListener();
}
}
}
public SubscriptionTarget SubscribeTo
{
get => m_SubscribeTo;
set
{
if (m_SubscribeTo == value)
return;
m_SubscribeTo = value;
if (m_Connected)
{
_disconnectListener();
_buildSubscriptionList();
_connectListener();
}
else
_buildSubscriptionList();
}
}
// =======================================================================
[Serializable] [Flags]
public enum SubscriptionTarget
{
None = 0,
/// <summary> EventBus singleton </summary>
Global = 1,
/// <summary> First parent EventBus </summary>
FirstParent = 1 << 1,
/// <summary> This gameObject EventBus </summary>
This = 1 << 2,
}
// =======================================================================
protected virtual void Awake()
{
_buildSubscriptionList();
m_Connected = false;
}
protected virtual void OnEnable()
{
_connectListener();
}
protected virtual void OnDisable()
{
_disconnectListener();
}
// =======================================================================
private void _connectListener()
{
// connect if disconnected
if (m_Connected)
return;
foreach (var bus in m_Buses)
bus.Subscribe(this);
m_Connected = true;
}
private void _disconnectListener()
{
// disconnect if connected
if (m_Connected == false)
return;
foreach (var bus in m_Buses)
bus.UnSubscribe(this);
m_Connected = false;
}
private void _buildSubscriptionList()
{
m_Buses.Clear();
if (m_SubscribeTo == SubscriptionTarget.None)
return;
// EventSystem singleton
if (m_SubscribeTo.HasFlag(SubscriptionTarget.Global) && ReferenceEquals(GlobalBus.Instance, null) == false)
m_Buses.Add(GlobalBus.Instance);
// first parent EventBus
if (m_SubscribeTo.HasFlag(SubscriptionTarget.FirstParent) && ReferenceEquals(transform.parent, null) == false)
{
var firstParent = transform.parent.GetComponentInParent<IEventBus>();
if (firstParent != null)
m_Buses.Add(firstParent);
}
// self if has IEventBus component
if (m_SubscribeTo.HasFlag(SubscriptionTarget.This))
{
if (transform.TryGetComponent<IEventBus>(out var thisBus))
m_Buses.Add(thisBus);
}
}
private void _resubscribe(SubscriptionTarget subscribeTo)
{
var unsibscribe = m_SubscribeTo & ~subscribeTo;
var subscribe = m_SubscribeTo ^ subscribeTo;
// unsubscribe from
if (unsibscribe.HasFlag(SubscriptionTarget.Global))
m_Buses.Remove(GlobalBus.Instance);
if (unsibscribe.HasFlag(SubscriptionTarget.FirstParent))
m_Buses.Remove(transform.parent.GetComponentInParent<IEventBus>());
if (unsibscribe.HasFlag(SubscriptionTarget.This))
m_Buses.Remove(GetComponent<IEventBus>());
// subscribe to
if (subscribe.HasFlag(SubscriptionTarget.Global) && ReferenceEquals(GlobalBus.Instance, null) == false)
m_Buses.Remove(GlobalBus.Instance);
if (subscribe.HasFlag(SubscriptionTarget.FirstParent) && ReferenceEquals(transform.parent, null) == false)
{
var firstParent = transform.parent.GetComponentInParent<IEventBus>();
if (firstParent != null)
m_Buses.Add(firstParent);
}
if (subscribe.HasFlag(SubscriptionTarget.This))
{
if (transform.TryGetComponent<IEventBus>(out var thisBus))
m_Buses.Add(thisBus);
}
m_SubscribeTo = subscribeTo;
}
}
}