完善Legend的formatter对多Serie的支持 (#332)

Documentation~/zh/changelog.md

@@ -76,6 +76,7 @@ slug: /changelog
 
 ## master
 
+* (2024.09.24) 完善`Legend`的`formatter`对多Serie的支持 (#332)
 * (2024.09.22) 调整`Documentation`文档显示样式
 * (2024.09.09) 增加`numericFormatter`对`date`和`time`的支持
 * (2024.09.03) 完善`AreaStyle`的`origin`参数设置区域填充起始位置

Runtime/Component/Legend/LegendHandler.cs

@@ -87,11 +87,14 @@ namespace XCharts.Runtime
                 ChartHelper.HideAllObject(legendObject);
                 if (!legend.show) return;
                 var textLimitInitFlag = false;
+                var isAnySerieColorByData = SeriesHelper.IsAnyColorByDataSerie(chart.series);
                 for (int i = 0; i < datas.Count; i++)
                 {
                     if (!SeriesHelper.IsLegalLegendName(datas[i])) continue;
                     string legendName = datas[i];
-                    var legendContent = GetFormatterContent(legend, i, datas[i]);
+                    var serieIndex =  isAnySerieColorByData ? 0 : i;
+                    var dataIndex =  isAnySerieColorByData ? i : 0;
+                    var legendContent = GetFormatterContent(legend, dataIndex, datas[i], serieIndex);
                     if (legend.textLimit.enable)
                         legendContent = legend.textLimit.GetLimitContent(legendContent);
                     var readIndex = chart.m_LegendRealShowName.IndexOf(datas[i]);
@@ -158,7 +161,7 @@ namespace XCharts.Runtime
             legend.refreshComponent();
         }
 
-        private string GetFormatterContent(Legend legend, int dataIndex, string category)
+        private string GetFormatterContent(Legend legend, int dataIndex, string category, int serieIndex)
         {
 #pragma warning disable 0618
             if (string.IsNullOrEmpty(legend.formatter) && string.IsNullOrEmpty(legend.labelStyle.formatter))
@@ -168,7 +171,7 @@ namespace XCharts.Runtime
                 var formatter = string.IsNullOrEmpty(legend.labelStyle.formatter) ? legend.formatter : legend.labelStyle.formatter;
                 var content = formatter.Replace("{name}", category);
                 content = content.Replace("{value}", category);
-                var serie = chart.GetSerie(0);
+                var serie = chart.GetSerie(serieIndex);
                 FormatterHelper.ReplaceContent(ref content, dataIndex, legend.labelStyle.numericFormatter, serie, chart, category);
                 return content;
             }

Runtime/Serie/SeriesHelper.cs

@@ -132,6 +132,21 @@ namespace XCharts.Runtime
             return false;
         }
 
+        /// <summary>
+        /// check if series has any serie which is color by data.
+        /// || 是否有任何一个系列是按数据颜色的。
+        /// </summary>
+        /// <param name="series"></param>
+        /// <returns></returns>
+        public static bool IsAnyColorByDataSerie(List<Serie> series)
+        {
+            foreach (var serie in series)
+            {
+                if (serie.defaultColorBy == SerieColorBy.Data) return true;
+            }
+            return false;
+        }
+
         /// <summary>
         /// 获得上一个同堆叠且显示的serie。
         /// </summary>