FireDrillSystem_GC_QZ/Assets/Scripts/Common/UINameShow/TruckMessagePanel.cs

using UnityEngine;
using UnityEngine.UI;
using AX.MessageSystem;

public class TruckMessagePanel : MonoBehaviour {

    private GameObject mFollowObj;
    private GameObject mCanvas;
    private Vector3 offset;
    private static TruckMessagePanel instance;

    private Text mFireTruckType;//车辆类型
    private Text mOrganization;//所属单位

    private void Awake()
    {
        mFireTruckType = transform.Find("FireTruckType").GetComponent<Text>();
        mOrganization = transform.Find("Organization").GetComponent<Text>();
        mCanvas = GameObject.Find("Canvas");
        offset = new Vector3(0, 6,0);
    }
    void Start () {
        MessageDispatcher.AddListener("HideOtherMessagePanel", HidePanel);
    }
    private void OnDestroy()
    {
        MessageDispatcher.RemoveListener("HideOtherMessagePanel", HidePanel);
    }

    void Update () {
        SetUIPosition();
    }
    private void HidePanel(IMessage obj)
    {
        var messageType = (MessageType)obj.Data;
        if (messageType != MessageType.TruckMessage)
        {
            instance.gameObject.SetActive(false);
        }
    }

    public static TruckMessagePanel Instance
    {
        get
        {
            if (instance == null)
            {
                var panel = Resources.Load("UI/TruckMessagePanel") as GameObject;
                var parent = GameObject.Find("Canvas/MessageParent").transform;
                var cloneObj = Instantiate(panel, parent);
                cloneObj.name = panel.name;
                instance = cloneObj.GetComponent<TruckMessagePanel>();
                cloneObj.SetActive(false);
            }
            return instance;
        }
    }

    public void SetUI(GameObject obj)
    {
        mFollowObj = obj;
        var mTruck = obj.GetComponent<CloneGameObjInfo>();        
        instance.gameObject.SetActive(true);
        mFireTruckType.text = mTruck.GetObjectName();       
        User mUser =new User();
        mUser.Id = mTruck.UserID;
        Room mRoom = CurrentUserInfo.room;
        foreach (UserData mUserData in mRoom.UserList)
        {
            if (mUser.Id == mUserData.UserInfo.Id)
            {
                mOrganization.text = mUserData.Org.DisplayName;                
            }            
        }        
    }
    private void SetUIPosition()
    {
        Vector3 dir = (mFollowObj.transform.position - Camera.main.gameObject.transform.position).normalized;
        float dot = Vector3.Dot(Camera.main.gameObject.transform.forward, dir);//判断物体是否在相机前面
        if (dot < 0)
        {
            gameObject.SetActive(false);
            return;
        }
        else
        {
            gameObject.SetActive(true);
        }
        Vector2 position;
        //世界坐标转屏幕坐标
        Vector2 screenPosition = Camera.main.WorldToScreenPoint(mFollowObj.transform.position + offset);
        //屏幕坐标转画布坐标
        RectTransformUtility.ScreenPointToLocalPointInRectangle(transform.parent.GetComponent<RectTransform>(), screenPosition, mCanvas.GetComponent<Canvas>().worldCamera, out position);
        GetComponent<RectTransform>().anchoredPosition = position;
    }
}