Proper editor button sprites and Tooltip improvements

Assets/Scripts/LevelEditor/Tooltip.cs

@@ -0,0 +1,50 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+
+using TMPro;
+using RhythmHeavenMania.Common;
+
+namespace RhythmHeavenMania.Editor
+{
+    public class Tooltip : MonoBehaviour
+    {
+        public static Tooltip instance { get; private set; }
+
+        private void Awake()
+        {
+            instance = this;
+        }
+
+        public void OnEnter(string tooltipText)
+        {
+            this.GetComponent<Image>().enabled = true;
+            this.transform.GetChild(0).GetComponent<TMP_Text>().text = tooltipText;
+            this.transform.GetChild(0).gameObject.SetActive(true);
+        }
+
+        public void OnExit()
+        {
+            this.GetComponent<Image>().enabled = false;
+            this.transform.GetChild(0).gameObject.SetActive(false);
+        }
+
+        public void AddTooltip(GameObject g, string tooltipText)
+        {
+            EventTrigger et = g.AddComponent<EventTrigger>();
+
+            EventTrigger.Entry pointerEnter = new EventTrigger.Entry();
+            pointerEnter.eventID = EventTriggerType.PointerEnter;
+            pointerEnter.callback.AddListener((data) => { OnEnter(tooltipText); });
+
+            EventTrigger.Entry pointerExit = new EventTrigger.Entry();
+            pointerExit.eventID = EventTriggerType.PointerExit;
+            pointerExit.callback.AddListener((data) => { OnExit(); });
+
+            et.triggers.Add(pointerEnter);
+            et.triggers.Add(pointerExit);
+        }
+    }
+}