using UnityEngine;

//Unity的一些扩展方法
static public class MethodExtensionForUnity
{
	/// <summary>
	/// Gets or add a component. Usage example:
	/// BoxCollider boxCollider = transform.GetOrAddComponent<BoxCollider>();
	/// </summary>
	static public T GetOrAddComponent<T>(this Component child, bool set_enable = false) where T : Component
	{
		T result = child.GetComponent<T>();
		if (result == null)
		{
			result = child.gameObject.AddComponent<T>();
		}
		var bcomp = result as Behaviour;
		if (set_enable)
		{
			if (bcomp != null) bcomp.enabled = true;
		}
		return result;
	}

	static public T GetOrAddComponent<T>(this GameObject go) where T : Component
	{
		T result = go.transform.GetComponent<T>();
		if (result == null)
		{
			result = go.AddComponent<T>();
		}
		var bcomp = result as Behaviour;
		if (bcomp != null) bcomp.enabled = true;
		return result;
	}


	public static void walk(this GameObject o, System.Action<GameObject> f)
	{
		f(o);

		int numChildren = o.transform.childCount;

		for (int i = 0; i < numChildren; ++i)
		{
			walk(o.transform.GetChild(i).gameObject, f);
		}
	}


}