add delegate callback function for legend

Assets/XCharts/CHANGELOG-EN.md

@@ -44,6 +44,7 @@
 
 ## branch-2.0
 
+* (2022.05.03) Added `onLegendClick`, `onLegendEnter` and `onLegendExit` delegate callbacks for `Legend`
 * (2022.04.21) Fixed bug #192 with `RingChart` `Tooltip` exception
 * (2022.04.21) Fixed error when setting `minShowNum` in `DataZoom`
 

Assets/XCharts/CHANGELOG.md

@@ -44,6 +44,7 @@
 
 ## branch-2.0
 
+* (2022.05.03) 增加`Legend`的`onLegendClick`,`onLegendEnter`和`onLegendExit`委托回调
 * (2022.04.21) 修复`RingChart`的`Tooltip`异常的问题 #192
 * (2022.04.21) 修复`DataZoom`设置`minShowNum`时可能会报错的问题
 

Assets/XCharts/Runtime/API/BaseChart_API.cs

@@ -132,7 +132,21 @@ namespace XCharts
         /// 点击饼图区域回调。参数：PointerEventData，SerieIndex，SerieDataIndex
         /// </summary>
         public Action<PointerEventData, int, int> onPointerClickPie { set { m_OnPointerClickPie = value; m_ForceOpenRaycastTarget = true; } get { return m_OnPointerClickPie; } }
-
+        /// <summary>
+        /// the callback function of click legend.
+        /// 点击图例按钮回调。参数：legendIndex, legendName, show
+        /// </summary>
+        public Action<int, string, bool> onLegendClick { set { m_OnLegendClick = value; } }
+        /// <summary>
+        /// the callback function of enter legend.
+        /// 鼠标进入图例回调。参数：legendIndex, legendName
+        /// </summary>
+        public Action<int, string> onLegendEnter { set { m_OnLegendEnter = value; } }
+        /// <summary>
+        /// the callback function of exit legend.
+        /// 鼠标退出图例回调。参数：legendIndex, legendName
+        /// </summary>
+        public Action<int, string> onLegendExit { set { m_OnLegendExit = value; } }
         /// <summary>
         /// Redraw chart in next frame.
         /// 在下一帧刷新图表。

Assets/XCharts/Runtime/Internal/BaseChart.cs

@@ -74,6 +74,9 @@ namespace XCharts
         protected Action<VertexHelper, Serie> m_OnCustomDrawSerieBeforeCallback;
         protected Action<VertexHelper, Serie> m_OnCustomDrawSerieAfterCallback;
         protected Action<PointerEventData, int, int> m_OnPointerClickPie;
+        protected Action<int, string, bool> m_OnLegendClick;
+        protected Action<int, string> m_OnLegendEnter;
+        protected Action<int, string> m_OnLegendExit;
 
         protected bool m_RefreshLabel = false;
         internal bool m_ReinitLabel = false;
@@ -847,6 +850,8 @@ namespace XCharts
                 }
                 OnYMaxValueChanged();
             }
+            if(m_OnLegendClick != null)
+                m_OnLegendClick(index, legendName, show);
         }
 
         protected virtual void OnLegendButtonEnter(int index, string legendName)
@@ -862,6 +867,8 @@ namespace XCharts
                     RefreshPainter(serie);
                 }
             }
+            if(m_OnLegendEnter != null)
+                m_OnLegendEnter(index, legendName);
         }
 
         protected virtual void OnLegendButtonExit(int index, string legendName)
@@ -877,6 +884,8 @@ namespace XCharts
                     RefreshPainter(serie);
                 }
             }
+            if(m_OnLegendExit != null)
+                m_OnLegendExit(index, legendName);
         }
 
         protected virtual void UpdateTooltip()