feat: add configuration to display aggregation result when data is empty

Author: 李杨枚

docs/assets/option/en/table/listTable.md

@@ -133,6 +133,10 @@ type CustomAggregation = {
 };
 ```
 
+## showAggregationWhenEmpty(boolean)
+
+Display aggregation result when data is empty.
+
 ## groupBy(string|string[])
 
 Enable the group display function to display the hierarchical structure of the group fields in the data. The value is the group field name, which can be configured as one field or an array of multiple fields.

docs/assets/option/zh/table/listTable.md

@@ -130,6 +130,10 @@ type CustomAggregation = {
 };
 ```
 
+## showAggregationWhenEmpty(boolean)
+
+数据为空时是否仍显示聚合结果。
+
 ## groupBy(string|string[])
 
 开启分组展示功能，用于展示数据中分组字段的层级结构。值为分组字段名称，可以配置一个字段，也可以配置多个字段组成的数组。

packages/vtable/src/ListTable.ts

@@ -618,7 +618,10 @@ export class ListTable extends BaseTable implements ListTableAPI {
 
     const dataCount = table.internalProps.dataSource?.length ?? 0;
     layoutMap.recordsCount =
-      dataCount + (dataCount > 0 ? layoutMap.hasAggregationOnTopCount + layoutMap.hasAggregationOnBottomCount : 0);
+      dataCount +
+      (dataCount > 0 || !!this.options.showAggregationWhenEmpty
+        ? layoutMap.hasAggregationOnTopCount + layoutMap.hasAggregationOnBottomCount
+        : 0);
 
     if (table.transpose) {
       table.rowCount = layoutMap.rowCount ?? 0;

packages/vtable/src/ts-types/table-engine.ts

@@ -280,7 +280,8 @@ export interface ListTableConstructorOptions extends BaseTableConstructorOptions
         col: number;
         field: string;
       }) => Aggregation | CustomAggregation | (Aggregation | CustomAggregation)[] | null);
-
+  /** 数据为空时显示聚合结果 */
+  showAggregationWhenEmpty?: boolean;
   enableTreeNodeMerge?: boolean;
   groupBy?: GroupByOption;
   groupTitleCustomLayout?: ICustomLayout;