Add enableCellHoverReveal column option

apps/mantine-react-table-docs/components/prop-tables/columnOptions.ts

@@ -136,6 +136,17 @@ export const columnOptions: ColumnOption[] = [
     required: false,
     type: "'select' | 'text' | 'multi-select'",
   },
+  {
+    columnOption: 'enableCellHoverReveal',
+    defaultValue: '',
+    description:
+      "Enable or disable cell hover reveal for this column. There are some limitations to this feature. Passing props through mantineTableBodyCellProps might not work as expected. For example, passing align:'right' to mantineTableBodyCellProps would not be applied.",
+    link: '',
+    linkText: '',
+    source: 'MRT',
+    required: false,
+    type: 'boolean',
+  },
   {
     columnOption: 'enableClickToCopy',
     defaultValue: '',

packages/mantine-react-table/src/components/body/MRT_TableBodyCell.module.css

@@ -74,3 +74,34 @@
     outline: 1px solid var(--mantine-color-gray-7);
   }
 }
+
+.root-cell-hover-reveal {
+  overflow: visible;
+}
+
+.cell-hover-reveal {
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  text-align: var(--mrt-cell-align);
+}
+
+.cell-hover-reveal.overflowing:hover{
+  overflow: visible;
+  white-space: normal;
+  position: absolute;
+  z-index: 2;
+  padding: var(--table-vertical-spacing)
+    var(--table-horizontal-spacing, var(--mantine-spacing-xs));
+  background-color: var(--mrt-base-background-color);
+  box-shadow: var(--mantine-shadow-sm);
+  border: 1px solid var(--mantine-primary-color-filled);
+  text-indent: -1px;
+  width: max-content;
+  top: 0;
+  left: 0;
+  height: 100%;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}

packages/mantine-react-table/src/components/body/MRT_TableBodyCell.tsx

@@ -9,6 +9,7 @@ import {
   type MouseEvent,
   type RefObject,
   useEffect,
+  useRef,
   useState,
 } from 'react';
 
@@ -194,6 +195,64 @@ export const MRT_TableBodyCell = <TData extends MRT_RowData>({
     table,
   };
 
+  const cellHoverRevealDivRef = useRef<any>(null);
+  const [isCellContentOverflowing, setIsCellContentOverflowing] =
+    useState(false);
+
+  const onMouseEnter = () => {
+    if (!columnDef.enableCellHoverReveal) return;
+    const div = cellHoverRevealDivRef.current;
+    if (div) {
+      const isOverflow = div.scrollWidth > div.clientWidth;
+      setIsCellContentOverflowing(isOverflow);
+    }
+  };
+
+  const onMouseLeave = () => {
+    if (!columnDef.enableCellHoverReveal) return;
+    setIsCellContentOverflowing(false);
+  };
+
+  const renderCellContent = () => {
+    if (cell.getIsPlaceholder()) {
+      return columnDef.PlaceholderCell?.({ cell, column, row, table }) ?? null;
+    }
+
+    if (showSkeletons !== false && (isLoading || showSkeletons)) {
+      return <Skeleton height={20} width={skeletonWidth} {...skeletonProps} />;
+    }
+
+    if (
+      columnDefType === 'display' &&
+      (['mrt-row-expand', 'mrt-row-numbers', 'mrt-row-select'].includes(
+        column.id,
+      ) ||
+        !row.getIsGrouped())
+    ) {
+      return columnDef.Cell?.({
+        column,
+        renderedCellValue: cell.renderValue() as any,
+        row,
+        rowRef,
+        ...cellValueProps,
+      });
+    }
+
+    if (isCreating || isEditing) {
+      return <MRT_EditCellTextInput cell={cell} table={table} />;
+    }
+
+    if (showClickToCopyButton && columnDef.enableClickToCopy !== false) {
+      return (
+        <MRT_CopyButton cell={cell} table={table}>
+          <MRT_TableBodyCellValue {...cellValueProps} />
+        </MRT_CopyButton>
+      );
+    }
+
+    return <MRT_TableBodyCellValue {...cellValueProps} />;
+  };
+
   return (
     <TableTd
       data-column-pinned={isColumnPinned || undefined}
@@ -243,47 +302,44 @@ export const MRT_TableBodyCell = <TData extends MRT_RowData>({
           classes['root-editable-hover'],
         columnDefType === 'data' && classes['root-data-col'],
         density === 'xs' && classes['root-nowrap'],
+        columnDef.enableCellHoverReveal && classes['root-cell-hover-reveal'],
         tableCellProps?.className,
       )}
       onDoubleClick={handleDoubleClick}
       onDragEnter={handleDragEnter}
+      onMouseEnter={onMouseEnter}
+      onMouseLeave={onMouseLeave}
       style={(theme) => ({
         ...widthStyles,
         ...parseFromValuesOrFunc(tableCellProps.style, theme),
       })}
     >
-      {tableCellProps.children ?? (
-        <>
-          {cell.getIsPlaceholder() ? (
-            (columnDef.PlaceholderCell?.({ cell, column, row, table }) ?? null)
-          ) : showSkeletons !== false && (isLoading || showSkeletons) ? (
-            <Skeleton height={20} width={skeletonWidth} {...skeletonProps} />
-          ) : columnDefType === 'display' &&
-            (['mrt-row-expand', 'mrt-row-numbers', 'mrt-row-select'].includes(
-              column.id,
-            ) ||
-              !row.getIsGrouped()) ? (
-            columnDef.Cell?.({
-              column,
-              renderedCellValue: cell.renderValue() as any,
-              row,
-              rowRef,
-              ...cellValueProps,
-            })
-          ) : isCreating || isEditing ? (
-            <MRT_EditCellTextInput cell={cell} table={table} />
-          ) : showClickToCopyButton && columnDef.enableClickToCopy !== false ? (
-            <MRT_CopyButton cell={cell} table={table}>
-              <MRT_TableBodyCellValue {...cellValueProps} />
-            </MRT_CopyButton>
+      <>
+        {tableCellProps.children ??
+          (columnDef.enableCellHoverReveal ? (
+            <div
+              className={clsx(
+                columnDef.enableCellHoverReveal &&
+                  !(isCreating || isEditing) &&
+                  classes['cell-hover-reveal'],
+                isCellContentOverflowing && classes['overflowing'],
+              )}
+              ref={cellHoverRevealDivRef}
+            >
+              {renderCellContent()}
+              {cell.getIsGrouped() && !columnDef.GroupedCell && (
+                <> ({row.subRows?.length})</>
+              )}
+            </div>
           ) : (
-            <MRT_TableBodyCellValue {...cellValueProps} />
-          )}
-          {cell.getIsGrouped() && !columnDef.GroupedCell && (
-            <> ({row.subRows?.length})</>
-          )}
-        </>
-      )}
+            <>
+              {renderCellContent()}
+              {cell.getIsGrouped() && !columnDef.GroupedCell && (
+                <> ({row.subRows?.length})</>
+              )}
+            </>
+          ))}
+      </>
     </TableTd>
   );
 };

packages/mantine-react-table/src/components/inputs/MRT_GlobalFilterTextInput.tsx

@@ -34,7 +34,7 @@ export const MRT_GlobalFilterTextInput = <TData extends MRT_RowData>({
       localization,
       mantineSearchTextInputProps,
       manualFiltering,
-      positionGlobalFilter
+      positionGlobalFilter,
     },
     refs: { searchInputRef },
     setGlobalFilter,

packages/mantine-react-table/src/types.ts

@@ -447,6 +447,7 @@ export type MRT_ColumnDef<TData extends MRT_RowData, TValue = unknown> = {
     table: MRT_TableInstance<TData>;
   }) => ReactNode;
   editVariant?: 'multi-select' | 'select' | 'text';
+  enableCellHoverReveal?: boolean;
   enableClickToCopy?: ((cell: MRT_Cell<TData>) => boolean) | boolean;
   enableColumnActions?: boolean;
   enableColumnDragging?: boolean;

packages/mantine-react-table/stories/features/CellHoverReveal.stories.tsx

@@ -0,0 +1,62 @@
+import { MantineReactTable, type MRT_ColumnDef } from '../../src';
+
+import { faker } from '@faker-js/faker';
+import { type Meta } from '@storybook/react';
+
+const meta: Meta = {
+  title: 'Features/Cell Hover Reveal Examples',
+};
+
+export default meta;
+
+const columns: MRT_ColumnDef<(typeof data)[0]>[] = [
+  {
+    accessorKey: 'firstName',
+    header: 'First Name',
+  },
+  {
+    accessorKey: 'lastName',
+    header: 'Last Name',
+  },
+  {
+    accessorKey: 'address',
+    header: 'Address',
+  },
+  {
+    accessorKey: 'state',
+    header: 'State',
+  },
+  {
+    accessorKey: 'phoneNumber',
+    header: 'Phone Number',
+  },
+  {
+    accessorKey: 'job',
+    enableCellHoverReveal: true,
+    header: 'Job',
+    size: 75,
+  },
+  {
+    accessorKey: 'jobDescriptor',
+    header: 'Job Descriptor',
+  },
+  {
+    accessorKey: 'company',
+    header: 'Company',
+  },
+];
+
+const data = [...Array(100)].map(() => ({
+  address: faker.location.streetAddress(),
+  company: faker.company.name(),
+  firstName: faker.person.firstName(),
+  job: faker.person.jobTitle(),
+  jobDescriptor: faker.person.jobDescriptor(),
+  lastName: faker.person.lastName(),
+  phoneNumber: faker.phone.number(),
+  state: faker.location.state(),
+}));
+
+export const CellHoverReveal = () => (
+  <MantineReactTable columns={columns} data={data} layoutMode="grid" />
+);