UIElement

using UnityEngine;

public class UIElement : MonoBehaviour {
    private const float RATIO = 100.0f;

    public const int UI_LAYER = 8;
    public const int INVISIBLE_LAYER = 9;

    private Transform goTransform;
    public UILayerUpdater layerUpdater;

    protected Transform UITransform {
        get { return goTransform ?? (goTransform = transform); }
    }

    public Transform Parent {
        get { return UITransform.parent; }
        set { UITransform.parent = value; }
    }

    public Vector3 LocalPosition {
        get { return UITransform.localPosition; }
        set { UITransform.localPosition = value; }
    }

    public Vector3 Position {
        get { return UITransform.position; }
        set { UITransform.position = value; }
    }

    public Quaternion Rotation {
        get { return UITransform.rotation; }
        set { UITransform.rotation = value; }
    }

    public Vector3 Scale {
        get { return UITransform.localScale; }
        set { UITransform.localScale = value; }
    }

    public virtual bool Show {
        set {
            if (layerUpdater != null) gameObject.layer = value ? layerUpdater.visibleLayer : INVISIBLE_LAYER;
            else gameObject.layer = value ? Parent.gameObject.layer : INVISIBLE_LAYER;
        }
        get { return gameObject.layer != INVISIBLE_LAYER; }
    }

    public virtual int Depth {
        get { return Mathf.RoundToInt(LocalPosition.z*RATIO); }

        set { LocalPosition = new Vector3(LocalPosition.x, LocalPosition.y, value/RATIO); }
    }


    public UIElement Instantiate() {
        var go = (GameObject) Instantiate(gameObject);
        return go.GetComponent<UIElement>();
    }
}