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frontend/node_modules/antd/es/table/style/virtual.js

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+import { unit } from '@ant-design/cssinjs';
+const genVirtualStyle = token => {
+  const {
+    componentCls,
+    motionDurationMid,
+    lineWidth,
+    lineType,
+    tableBorderColor,
+    calc
+  } = token;
+  const tableBorder = `${unit(lineWidth)} ${lineType} ${tableBorderColor}`;
+  const rowCellCls = `${componentCls}-expanded-row-cell`;
+  return {
+    [`${componentCls}-wrapper`]: {
+      // ========================== Row ==========================
+      [`${componentCls}-tbody-virtual`]: {
+        [`${componentCls}-tbody-virtual-holder-inner`]: {
+          [`
+            & > ${componentCls}-row, 
+            & > div:not(${componentCls}-row) > ${componentCls}-row
+          `]: {
+            display: 'flex',
+            boxSizing: 'border-box',
+            width: '100%'
+          }
+        },
+        [`${componentCls}-cell`]: {
+          borderBottom: tableBorder,
+          transition: `background ${motionDurationMid}`
+        },
+        [`${componentCls}-expanded-row`]: {
+          [`${rowCellCls}${rowCellCls}-fixed`]: {
+            position: 'sticky',
+            insetInlineStart: 0,
+            overflow: 'hidden',
+            width: `calc(var(--virtual-width) - ${unit(lineWidth)})`,
+            borderInlineEnd: 'none'
+          }
+        }
+      },
+      // ======================== Border =========================
+      [`${componentCls}-bordered`]: {
+        [`${componentCls}-tbody-virtual`]: {
+          '&:after': {
+            content: '""',
+            insetInline: 0,
+            bottom: 0,
+            borderBottom: tableBorder,
+            position: 'absolute'
+          },
+          [`${componentCls}-cell`]: {
+            borderInlineEnd: tableBorder,
+            [`&${componentCls}-cell-fix-right-first:before`]: {
+              content: '""',
+              position: 'absolute',
+              insetBlock: 0,
+              insetInlineStart: calc(lineWidth).mul(-1).equal(),
+              borderInlineStart: tableBorder
+            }
+          }
+        },
+        // Empty placeholder
+        [`&${componentCls}-virtual`]: {
+          [`${componentCls}-placeholder ${componentCls}-cell`]: {
+            borderInlineEnd: tableBorder,
+            borderBottom: tableBorder
+          }
+        }
+      }
+    }
+  };
+};
+export default genVirtualStyle;