refactor: optimize text padding logic

packages/s2-core/src/facet/header/series-number.ts

@@ -5,7 +5,7 @@ import { measureTextWidth } from '@/utils/text';
 import { getAdjustPosition } from '@/utils/text-absorption';
 import { BBox, IGroup, IShape } from '@antv/g-canvas';
 import { each } from 'lodash';
-import { ViewMeta } from '@/common/interface';
+import { Padding, ViewMeta } from '@/common/interface';
 import { translateGroup } from '../utils';
 import { BaseHeader, BaseHeaderConfig } from './base';
 
@@ -145,13 +145,7 @@ export class SeriesNumberHeader extends BaseHeader<BaseHeaderConfig> {
       isLeaf,
       isTotals,
     } = cellData;
-    const padding = { ...rowCellTheme.cell.padding };
-    const labelWidth = measureTextWidth(
-      label,
-      this.headerConfig.spreadsheet.theme.rowCell.text,
-    );
-    padding.left = Math.max(Math.abs((cellWidth - labelWidth) / 2), 4);
-    padding.right = padding.left;
+    const padding = this.getTextPadding(label, cellWidth);
     const textStyle =
       isLeaf && !isTotals ? rowCellTheme.text : rowCellTheme.bolderText;
     const textY = getAdjustPosition(
@@ -172,4 +166,15 @@ export class SeriesNumberHeader extends BaseHeader<BaseHeaderConfig> {
       },
     });
   }
+
+  private getTextPadding(text: string, cellWidth: number): Padding {
+    const rowCellTheme = this.headerConfig.spreadsheet.theme.rowCell;
+    const textWidth = measureTextWidth(text, rowCellTheme.text);
+    const padding = Math.max(Math.abs((cellWidth - textWidth) / 2), 4);
+    return {
+      ...rowCellTheme.cell.padding,
+      left: padding,
+      right: padding,
+    };
+  }
 }