Add `clipBehavior` and apply `borderRadius` to DataTable's Material (#113205)

packages/flutter/lib/src/material/data_table.dart

@@ -406,6 +406,7 @@ class DataTable extends StatelessWidget {
     required this.rows,
     this.checkboxHorizontalMargin,
     this.border,
+    this.clipBehavior = Clip.none,
   }) : assert(columns != null),
        assert(columns.isNotEmpty),
        assert(sortColumnIndex == null || (sortColumnIndex >= 0 && sortColumnIndex < columns.length)),
@@ -414,6 +415,7 @@ class DataTable extends StatelessWidget {
        assert(rows != null),
        assert(!rows.any((DataRow row) => row.cells.length != columns.length)),
        assert(dividerThickness == null || dividerThickness >= 0),
+       assert(clipBehavior != null),
        _onlyTextColumn = _initOnlyTextColumn(columns);
 
   /// The configuration and labels for the columns in the table.
@@ -638,6 +640,13 @@ class DataTable extends StatelessWidget {
   /// The style to use when painting the boundary and interior divisions of the table.
   final TableBorder? border;
 
+  /// {@macro flutter.material.Material.clipBehavior}
+  ///
+  /// This can be used to clip the content within the border of the [DataTable].
+  ///
+  /// Defaults to [Clip.none], and must not be null.
+  final Clip clipBehavior;
+
   // Set by the constructor to the index of the only Column that is
   // non-numeric, if there is exactly one, otherwise null.
   final int? _onlyTextColumn;
@@ -1056,6 +1065,8 @@ class DataTable extends StatelessWidget {
       decoration: decoration ?? dataTableTheme.decoration ?? theme.dataTableTheme.decoration,
       child: Material(
         type: MaterialType.transparency,
+        borderRadius: border?.borderRadius,
+        clipBehavior: clipBehavior,
         child: Table(
           columnWidths: tableColumns.asMap(),
           children: tableRows,

packages/flutter/lib/src/rendering/table_border.dart

@@ -74,6 +74,8 @@ class TableBorder {
   final BorderSide verticalInside;
 
   /// The [BorderRadius] to use when painting the corners of this border.
+  ///
+  /// It is also applied to [DataTable]'s [Material].
   final BorderRadius borderRadius;
 
   /// The widths of the sides of this border represented as an [EdgeInsets].

packages/flutter/test/material/data_table_test.dart

@@ -1895,4 +1895,53 @@ void main() {
     // Go without crashes.
 
   });
+
+  testWidgets('DataTable clip behavior', (WidgetTester tester) async {
+    const Color selectedColor = Colors.green;
+    const Color defaultColor = Colors.red;
+    const BorderRadius borderRadius = BorderRadius.all(Radius.circular(30));
+
+    Widget buildTable({bool selected = false, required Clip clipBehavior}) {
+      return Material(
+        child: DataTable(
+          clipBehavior: clipBehavior,
+          border: TableBorder.all(borderRadius: borderRadius),
+          columns: const <DataColumn>[
+            DataColumn(
+              label: Text('Column1'),
+            ),
+          ],
+          rows: <DataRow>[
+            DataRow(
+              selected: selected,
+              color: MaterialStateProperty.resolveWith<Color>(
+                    (Set<MaterialState> states) {
+                  if (states.contains(MaterialState.selected)) {
+                    return selectedColor;
+                  }
+                  return defaultColor;
+                },
+              ),
+              cells: const <DataCell>[
+                DataCell(Text('Content1')),
+              ],
+            ),
+          ],
+        ),
+      );
+    }
+
+    // Test default clip behavior.
+    await tester.pumpWidget(MaterialApp(home: buildTable(clipBehavior: Clip.none)));
+
+    Material material = tester.widget<Material>(find.byType(Material).last);
+    expect(material.clipBehavior, Clip.none);
+    expect(material.borderRadius, borderRadius);
+
+    await tester.pumpWidget(MaterialApp(home: buildTable(clipBehavior: Clip.hardEdge)));
+
+    material = tester.widget<Material>(find.byType(Material).last);
+    expect(material.clipBehavior, Clip.hardEdge);
+    expect(material.borderRadius, borderRadius);
+  });
 }