83 lines
2.4 KiB
C#
83 lines
2.4 KiB
C#
namespace SRF.Components
|
|
{
|
|
using System;
|
|
using System.Diagnostics;
|
|
using UnityEngine;
|
|
using Debug = UnityEngine.Debug;
|
|
|
|
/// <summary>
|
|
/// Inherit from this component to easily create a singleton gameobject.
|
|
/// </summary>
|
|
/// <typeparam name="T"></typeparam>
|
|
public abstract class SRSingleton<T> : SRMonoBehaviour where T : SRSingleton<T>
|
|
{
|
|
private static T _instance;
|
|
|
|
/// <summary>
|
|
/// Get the instance of this singleton.
|
|
/// </summary
|
|
public static T Instance
|
|
{
|
|
[DebuggerStepThrough]
|
|
get
|
|
{
|
|
// Instance requiered for the first time, we look for it
|
|
if (_instance == null)
|
|
{
|
|
throw new InvalidOperationException("No instance of {0} present in scene".Fmt(typeof (T).Name));
|
|
}
|
|
return _instance;
|
|
}
|
|
}
|
|
|
|
public static bool HasInstance
|
|
{
|
|
[DebuggerStepThrough] get { return _instance != null; }
|
|
}
|
|
|
|
private void Register()
|
|
{
|
|
if (_instance != null)
|
|
{
|
|
Debug.LogWarning("More than one singleton object of type {0} exists.".Fmt(typeof (T).Name));
|
|
|
|
// Check if gameobject only contains Transform and this component
|
|
if (GetComponents<Component>().Length == 2)
|
|
{
|
|
Destroy(gameObject);
|
|
}
|
|
else
|
|
{
|
|
Destroy(this);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
_instance = (T) this;
|
|
}
|
|
|
|
// If no other monobehaviour request the instance in an awake function
|
|
// executing before this one, no need to search the object.
|
|
protected virtual void Awake()
|
|
{
|
|
Register();
|
|
}
|
|
|
|
protected virtual void OnEnable()
|
|
{
|
|
// In case of code-reload, this should restore the single instance
|
|
if (_instance == null)
|
|
{
|
|
Register();
|
|
}
|
|
}
|
|
|
|
// Make sure the instance isn't referenced anymore when the user quit, just in case.
|
|
private void OnApplicationQuit()
|
|
{
|
|
_instance = null;
|
|
}
|
|
}
|
|
}
|