Introducing the UI and ToastManager

Assets/Scripts/UI/Intro.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Intro : MonoBehaviour {
+
+    [SerializeField]
+    private List<ToastMessage> messages;
+    [SerializeField]
+    private UIManager uiManager;
+
+	// Use this for initialization
+	void Start () {
+		foreach( ToastMessage msg in messages)
+        {
+            msg.SetUIManager(uiManager);
+            uiManager.QueueMessage(msg);
+        }
+	}
+	
+	// Update is called once per frame
+	void Update () {
+		
+	}
+}

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Assets/Scripts/UI/Toast.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class Toast : MonoBehaviour {
+
+    public Text textElement;
+    public Image iconElement;
+
+}

Assets/Scripts/UI/Toast.cs.meta

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Assets/Scripts/UI/UIManager.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[System.Serializable]
+public class ToastMessage
+{
+    [SerializeField]
+    private string messageText;
+    [SerializeField]
+    private float duration;
+    private float timeLeft;
+    [SerializeField]
+    private Texture2D icon;
+    [SerializeField]
+    private GameObject toastPrefab;
+    private GameObject toastElements;
+    private UIManager mngr;
+
+    public void SetUIManager(UIManager _mngr)
+    {
+        mngr = _mngr;
+    }
+
+    public float TimeTick()
+    {
+        return timeLeft = timeLeft - Time.deltaTime;
+    }
+
+    public GameObject CreateToastElements()
+    {
+        GameObject toastContainer = GameObject.Instantiate(toastPrefab,toastPrefab.transform.position, Quaternion.identity);
+        toastContainer.transform.SetParent(mngr.worldCanvas.transform);
+        Toast toast = toastContainer.GetComponent<Toast>();
+        toast.textElement.text = this.messageText;
+        Debug.Log(mngr);
+        icon = mngr.defaultIcon;
+        toast.iconElement.sprite = Sprite.Create(icon, new Rect(0.0f, 0.0f, icon.width, icon.height), Vector2.one);
+        toastContainer.SetActive(false);
+        toastElements = toastContainer;
+        return toastContainer;
+    }
+
+    public void ShowToastElements()
+    {
+        if (toastElements != null)
+        {
+            toastElements.SetActive(true);
+        }
+        else
+        {
+            Debug.LogWarning("Trying to show ToastElements before calling CreateToastElements() does not work.");
+        }
+    }
+
+    public void DestroyToastElements()
+    {
+        if(toastElements != null)
+        {
+            GameObject.Destroy(toastElements);
+        } else
+        {
+            Debug.LogWarning("Trying to destroy ToastElements before calling CreateToastElements() does not work.");
+        }
+    }
+}
+
+public class UIManager : MonoBehaviour {
+
+    public  GameObject worldCanvas;
+    public  Texture2D defaultIcon;
+
+
+    private List<ToastMessage> messageQueue = new List<ToastMessage>();
+    private ToastMessage currentMessage;
+
+	// Use this for initialization
+	void Start () {
+
+	}
+	
+    private void DisplayMessage(ToastMessage msg)
+    {
+        msg.CreateToastElements();
+        msg.ShowToastElements();
+    }
+
+    private ToastMessage PopNextMessage()
+    {
+        if (messageQueue[0] != null)
+        {
+            ToastMessage next = messageQueue[0];
+            messageQueue.RemoveAt(0);
+            return next;
+        }
+        return null;
+    }
+
+	// Update is called once per frame
+	void Update () {
+        if (messageQueue.Count == 0 && currentMessage == null)
+        {
+            return; //No messages 
+        }
+
+
+        if (currentMessage == null)
+        {
+            DisplayMessage(PopNextMessage());
+        }
+        else
+        {
+            float messageTimeLeft = currentMessage.TimeTick();
+            if (messageTimeLeft <= 0)
+            {
+                currentMessage.DestroyToastElements();
+                currentMessage = PopNextMessage();
+                DisplayMessage(currentMessage);
+            }
+        }
+	}
+
+    private void SetCurrentMessage(ToastMessage messageObject)
+    {
+        this.currentMessage = messageObject;
+    }
+
+    public ToastMessage createMessageObject(string text, float duration, Texture2D icon)
+    {
+        return new ToastMessage();
+    }
+
+    public int QueueMessage(ToastMessage msg)
+    {
+        messageQueue.Add(msg);
+        return messageQueue.Count;
+    }
+ 
+}

Assets/Scripts/UI/UIManager.cs.meta

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