增加DataZoom的startEndFunction委托

Documentation~/zh/changelog.md

@@ -65,6 +65,7 @@ slug: /changelog
 
 ## master
 
+* (2023.02.26) 增加`DataZoom`的`startEndFunction`委托
 * (2023.02.12) 重构`Component`相关代码，调整API接口
 * (2023.02.10) 修复`Axis`在`Log`轴时某些情况下最小值不正确的问题
 * (2023.02.10) 优化`Axis`的数值`Label`的默认显示格式

Runtime/Component/DataZoom/DataZoom.cs

@@ -93,6 +93,7 @@ namespace XCharts.Runtime
         [SerializeField][Since("v3.6.0")] private bool m_EndLock;
 
         public DataZoomContext context = new DataZoomContext();
+        private CustomDataZoomStartEndFunction m_StartEndFunction;
 
         /// <summary>
         /// Whether to show dataZoom.
@@ -393,6 +394,10 @@ namespace XCharts.Runtime
             get { return m_MarqueeStyle; }
             set { if (PropertyUtil.SetClass(ref m_MarqueeStyle, value)) SetAllDirty(); }
         }
+        /// <summary>
+        /// start和end变更委托。
+        /// </summary>
+        public CustomDataZoomStartEndFunction startEndFunction { get { return m_StartEndFunction; } set { m_StartEndFunction = value; } }
 
         class AxisIndexValueInfo
         {

Runtime/Component/DataZoom/DataZoomHandler.cs

@@ -397,6 +397,8 @@ namespace XCharts.Runtime
 
             if (end < start)
                 end = start;
+            if (dataZoom.startEndFunction != null)
+                dataZoom.startEndFunction(ref start, ref end);
 
             if (!dataZoom.startLock)
                 dataZoom.start = start;

Runtime/Internal/Misc/DelegateFunction.cs

@@ -22,4 +22,10 @@ namespace XCharts.Runtime
     /// <returns></returns>
     public delegate float SymbolSizeFunction(List<double> data);
     public delegate void CustomDrawGaugePointerFunction(VertexHelper vh, int serieIndex, int dataIndex, float currentAngle);
+    /// <summary>
+    /// DataZoom的start和end变更时的委托方法。
+    /// </summary>
+    /// <param name="start"></param>
+    /// <param name="end"></param>
+    public delegate void CustomDataZoomStartEndFunction(ref float start, ref float end);
 }