增加代码API注释文档，整理代码

Scripts/UI/Component/Tooltip.cs

@@ -0,0 +1,278 @@
+using System.Collections.Generic;
+using System;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace XCharts
+{
+    /// <summary>
+    /// Tooltip component.
+    /// 提示框组件
+    /// </summary>
+    [System.Serializable]
+    public class Tooltip
+    {
+        /// <summary>
+        /// Indicator type.
+        /// 阴影指示器。
+        /// </summary>
+        public enum Type
+        {
+            /// <summary>
+            /// line indicator.
+            /// 直线指示器
+            /// </summary>
+            Line,
+            /// <summary>
+            /// shadow crosshair indicator.
+            /// 阴影指示器
+            /// </summary>
+            Shadow,
+            /// <summary>
+            /// no indicator displayed.
+            /// 无指示器
+            /// </summary>
+            None,
+            /// <summary>
+            /// crosshair indicator, which is actually the shortcut of enable two axisPointers of two orthometric axes.
+            /// 十字准星指示器。坐标轴显示Label和交叉线。
+            /// </summary>
+            Corss
+        }
+
+        [SerializeField] private bool m_Show;
+        [SerializeField] private Type m_Type;
+
+        private GameObject m_GameObject;
+        private GameObject m_Content;
+        private Text m_ContentText;
+        private RectTransform m_ContentRect;
+        private List<int> lastDataIndex { get; set; }
+
+        /// <summary>
+        /// Whether to show the tooltip component.
+        /// 是否显示提示框组件。
+        /// </summary>
+        /// <returns></returns>
+        public bool show { get { return m_Show; } set { m_Show = value; SetActive(value); } }
+        /// <summary>
+        /// Indicator type.
+        /// 提示框指示器类型。
+        /// </summary>
+        public Type type { get { return m_Type; } set { m_Type = value; } }
+
+        /// <summary>
+        /// The data index currently indicated by Tooltip.
+        /// 当前提示框所指示的数据项索引。
+        /// </summary>
+        public List<int> dataIndex { get; set; }
+        /// <summary>
+        /// the value for x indicator label.
+        /// 指示器X轴上要显示的值。
+        /// </summary>
+        public float[] xValues { get; set; }
+        /// <summary>
+        /// the value for y indicator label. 
+        /// 指示器Y轴上要显示的值。
+        /// </summary>
+        public float[] yValues { get; set; }
+        /// <summary>
+        /// the current pointer position.
+        /// 当前鼠标位置。
+        /// </summary>
+        public Vector2 pointerPos { get; set; }
+        /// <summary>
+        /// the width of tooltip. 
+        /// 提示框宽。
+        /// </summary>
+        public float width { get { return m_ContentRect.sizeDelta.x; } }
+        /// <summary>
+        /// the height of tooltip. 
+        /// 提示框高。
+        /// </summary>
+        public float height { get { return m_ContentRect.sizeDelta.y; } }
+        /// <summary>
+        /// Whether the tooltip has been initialized. 
+        /// 提示框是否已初始化。
+        /// </summary>
+        public bool inited { get { return m_GameObject != null; } }
+        /// <summary>
+        /// the gameObject of tooltip. 
+        /// 提示框的gameObject。
+        /// </summary>
+        public GameObject gameObject { get { return m_GameObject; } }
+
+        public static Tooltip defaultTooltip
+        {
+            get
+            {
+                var tooltip = new Tooltip
+                {
+                    m_Show = true,
+                    xValues = new float[2],
+                    yValues = new float[2],
+                    dataIndex = new List<int>() { -1, -1 },
+                    lastDataIndex = new List<int>() { -1, -1 }
+                };
+                return tooltip;
+            }
+        }
+
+        /// <summary>
+        /// 绑定提示框gameObject
+        /// </summary>
+        /// <param name="obj"></param>
+        public void SetObj(GameObject obj)
+        {
+            m_GameObject = obj;
+            m_GameObject.SetActive(false);
+        }
+
+        /// <summary>
+        /// 绑定提示框的文本框gameObject
+        /// </summary>
+        /// <param name="content"></param>
+        public void SetContentObj(GameObject content)
+        {
+            m_Content = content;
+            m_ContentRect = m_Content.GetComponent<RectTransform>();
+            m_ContentText = m_Content.GetComponentInChildren<Text>();
+        }
+
+        /// <summary>
+        /// Keep Tooltiop displayed at the top. 
+        /// 保持Tooltiop显示在最顶上
+        /// </summary>
+        public void UpdateToTop()
+        {
+            int count = m_GameObject.transform.parent.childCount;
+            m_GameObject.GetComponent<RectTransform>().SetSiblingIndex(count - 1);
+        }
+
+        /// <summary>
+        /// 设置提示框文本背景色
+        /// </summary>
+        /// <param name="color"></param>
+        public void SetContentBackgroundColor(Color color)
+        {
+            m_Content.GetComponent<Image>().color = color;
+        }
+
+        /// <summary>
+        /// 设置提示框文本字体颜色
+        /// </summary>
+        /// <param name="color"></param>
+        public void SetContentTextColor(Color color)
+        {
+            if (m_ContentText)
+            {
+                m_ContentText.color = color;
+            }
+        }
+
+        /// <summary>
+        /// 设置提示框文本内容
+        /// </summary>
+        /// <param name="txt"></param>
+        public void UpdateContentText(string txt)
+        {
+            if (m_ContentText)
+            {
+                m_ContentText.text = txt;
+                m_ContentRect.sizeDelta = new Vector2(m_ContentText.preferredWidth + 8,
+                    m_ContentText.preferredHeight + 8);
+            }
+        }
+
+        /// <summary>
+        /// 清除提示框指示数据
+        /// </summary>
+        public void ClearValue()
+        {
+            dataIndex[0] = dataIndex[1] = -1;
+            xValues[0] = xValues[1] = -1;
+            yValues[0] = yValues[1] = -1;
+        }
+
+        /// <summary>
+        /// 提示框是否显示
+        /// </summary>
+        /// <returns></returns>
+        public bool IsActive()
+        {
+            return m_GameObject != null && m_GameObject.activeInHierarchy;
+        }
+
+        /// <summary>
+        /// 设置提示框是否显示
+        /// </summary>
+        /// <param name="flag"></param>
+        public void SetActive(bool flag)
+        {
+            lastDataIndex[0] = lastDataIndex[1] = -1;
+            if (m_GameObject && m_GameObject.activeInHierarchy != flag)
+                m_GameObject.SetActive(flag);
+        }
+
+        /// <summary>
+        /// 更新文本框位置
+        /// </summary>
+        /// <param name="pos"></param>
+        public void UpdateContentPos(Vector2 pos)
+        {
+            if (m_Content)
+                m_Content.transform.localPosition = pos;
+        }
+
+        /// <summary>
+        /// 获得当前提示框的位置
+        /// </summary>
+        /// <returns></returns>
+        public Vector3 GetContentPos()
+        {
+            if (m_Content)
+                return m_Content.transform.localPosition;
+            else
+                return Vector3.zero;
+        }
+
+        /// <summary>
+        /// Whether the data item indicated by tooltip has changed. 
+        /// 提示框所指示的数据项是否发生变化。
+        /// </summary>
+        /// <returns></returns>
+        public bool IsDataIndexChanged()
+        {
+            return dataIndex[0] != lastDataIndex[0] ||
+                dataIndex[1] != lastDataIndex[1];
+        }
+
+        /// <summary>
+        /// 当前索引缓存
+        /// </summary>
+        public void UpdateLastDataIndex()
+        {
+            lastDataIndex[0] = dataIndex[0];
+            lastDataIndex[1] = dataIndex[1];
+        }
+
+        /// <summary>
+        /// 当前提示框是否选中数据项
+        /// </summary>
+        /// <returns></returns>
+        public bool IsSelected()
+        {
+            return dataIndex[0] >= 0 || dataIndex[1] >= 0;
+        }
+
+        /// <summary>
+        /// 指定索引的数据项是否被提示框选中
+        /// </summary>
+        /// <param name="index"></param>
+        /// <returns></returns>
+        public bool IsSelected(int index)
+        {
+            return dataIndex[0] == index || dataIndex[1] == index;
+        }
+    }
+}