battlearray_client/Assets/Scripts/UI/Utils/RedDot.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class RedDot : MonoBehaviour {

	public enum Align
	{
		TopLeft,
		TopRight,
		BottomLeft,
		BottomRight,
	}

	public Text text;

	private void SetNum(int value)
	{
		text.text = value.ToString ();
	}

	public static void SetValue(Transform container, int value, Align align=Align.TopLeft)
	{
		RedDot redDot = container.GetComponentInChildren<RedDot> ();
		if (redDot == null && value != 0) {
			GameObject redDotObj = GameObject.Instantiate<GameObject> (Resources.Load<GameObject> ("Prefabs/UI/RedDot"));
			PopUpManager.AddToMainCanvas (redDotObj, container);
			redDot = redDotObj.GetComponent<RedDot> ();


			RectTransform rectTrans = container as RectTransform;
			Vector3[] corners = new Vector3[4];
			rectTrans.GetWorldCorners (corners);


			if(align == Align.TopLeft)
			{
				Vector3 pos = corners [1];
				pos.z = 0;
				redDot.transform.position = pos;
			}
			else if(align == Align.TopRight)
			{
				Vector3 pos = corners [2];
				pos.z = 0;
				redDot.transform.position = pos;
			}
			else if(align == Align.BottomRight)
			{
				Vector3 pos = corners [3];
				pos.z = 0;
				redDot.transform.position = pos;
			}
			else if(align == Align.BottomLeft)
			{
				Vector3 pos = corners [0];
				pos.z = 0;
				redDot.transform.position = pos;
			}
		}


		if (value == 0) {
			if (redDot != null) {
				GameObject.Destroy (redDot.gameObject);
			}
		} else {
			redDot.SetNum (value);
		}
	}
}