0.2版本，重构代码，增加Editor

Scripts/UI/Internal/Tooltip.cs

@@ -0,0 +1,74 @@
+using System;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace XCharts
+{
+    [System.Serializable]
+    public class Tooltip
+    {
+        [SerializeField] private bool m_Show;
+
+        [NonSerialized] private GameObject m_GameObject;
+        [NonSerialized] private Text m_Text;
+        [NonSerialized] private RectTransform m_BackgroudRect;
+
+        public bool show { get { return m_Show; }set { m_Show = value; } }
+        public int dataIndex { get; set; }
+        public int lastDataIndex { get; set; }
+        public float width { get { return m_BackgroudRect.sizeDelta.x; } }
+        public float height { get { return m_BackgroudRect.sizeDelta.y; } }
+
+        public static Tooltip defaultTooltip
+        {
+            get
+            {
+                var tooltip = new Tooltip
+                {
+                    m_Show = true
+                };
+                return tooltip;
+            }
+        }
+
+        public void SetObj(GameObject obj)
+        {
+            m_GameObject = obj;
+            m_BackgroudRect = m_GameObject.GetComponent<RectTransform>();
+            m_Text = m_GameObject.GetComponentInChildren<Text>();
+        }
+
+        public void SetBackgroundColor(Color color)
+        {
+            m_GameObject.GetComponent<Image>().color = color;
+        }
+
+        public void SetTextColor(Color color)
+        {
+            m_Text.color = color;
+        }
+
+        public void UpdateTooltipText(string txt)
+        {
+            m_Text.text = txt;
+            m_BackgroudRect.sizeDelta = new Vector2(m_Text.preferredWidth + 8, m_Text.preferredHeight + 8);
+        }
+
+        public void SetActive(bool flag)
+        {
+            if(m_GameObject)
+                m_GameObject.SetActive(flag);
+        }
+
+        public void UpdatePos(Vector2 pos)
+        {
+            if(m_GameObject)
+                m_GameObject.transform.localPosition = pos;
+        }
+
+        public Vector3 GetPos()
+        {
+            return m_GameObject.transform.localPosition;
+        }
+    }
+}