Added padding property to NavigationRail items (#69404)

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

@@ -496,6 +496,7 @@ class _NavigationRailState extends State<NavigationRail> with TickerProviderStat
                           labelType: labelType,
                           iconTheme: widget.selectedIndex == i ? selectedIconTheme : unselectedIconTheme,
                           labelTextStyle: widget.selectedIndex == i ? selectedLabelTextStyle : unselectedLabelTextStyle,
+                          padding: widget.destinations[i].padding,
                           onTap: () {
                             widget.onDestinationSelected!(i);
                           },
@@ -579,6 +580,7 @@ class _RailDestination extends StatelessWidget {
     required this.labelTextStyle,
     required this.onTap,
     required this.indexLabel,
+    this.padding,
   }) : assert(minWidth != null),
        assert(minExtendedWidth != null),
        assert(icon != null),
@@ -609,6 +611,7 @@ class _RailDestination extends StatelessWidget {
   final TextStyle labelTextStyle;
   final VoidCallback onTap;
   final String indexLabel;
+  final EdgeInsetsGeometry? padding;
 
   final Animation<double> _positionAnimation;
 
@@ -634,7 +637,9 @@ class _RailDestination extends StatelessWidget {
           ),
         );
         if (extendedTransitionAnimation.value == 0) {
-          content = Stack(
+          content = Padding(
+            padding: padding ?? EdgeInsets.zero,
+            child: Stack(
               children: <Widget>[
                 iconPart,
                 // For semantics when label is not showing,
@@ -648,9 +653,12 @@ class _RailDestination extends StatelessWidget {
                   ),
                 ),
               ]
+            ),
           );
         } else {
-          content = ConstrainedBox(
+          content = Padding(
+            padding: padding ?? EdgeInsets.zero,
+            child: ConstrainedBox(
               constraints: BoxConstraints(
                 minWidth: lerpDouble(minWidth, minExtendedWidth, extendedTransitionAnimation.value)!,
               ),
@@ -672,6 +680,7 @@ class _RailDestination extends StatelessWidget {
                   ],
                 ),
               ),
+            ),
           );
         }
         break;
@@ -683,7 +692,7 @@ class _RailDestination extends StatelessWidget {
             minWidth: minWidth,
             minHeight: minWidth,
           ),
-          padding: const EdgeInsets.symmetric(horizontal: _horizontalDestinationPadding),
+          padding: padding ?? const EdgeInsets.symmetric(horizontal: _horizontalDestinationPadding),
           child: ClipRect(
             child: Column(
               mainAxisSize: MainAxisSize.min,
@@ -713,7 +722,7 @@ class _RailDestination extends StatelessWidget {
             minWidth: minWidth,
             minHeight: minWidth,
           ),
-          padding: const EdgeInsets.symmetric(horizontal: _horizontalDestinationPadding),
+          padding: padding ?? const EdgeInsets.symmetric(horizontal: _horizontalDestinationPadding),
           child: Column(
             children: <Widget>[
               const SizedBox(height: _verticalDestinationPaddingWithLabel),
@@ -811,6 +820,7 @@ class NavigationRailDestination {
     required this.icon,
     Widget? selectedIcon,
     this.label,
+    this.padding,
   }) : selectedIcon = selectedIcon ?? icon,
        assert(icon != null);
 
@@ -848,6 +858,9 @@ class NavigationRailDestination {
   /// still used for semantics, and may still be used if
   /// [NavigationRail.extended] is true.
   final Widget? label;
+
+  /// The amount of space to inset the destination item.
+  final EdgeInsetsGeometry? padding;
 }
 
 class _ExtendedNavigationRailAnimation extends InheritedWidget {

packages/flutter/test/material/navigation_rail_test.dart

@@ -2022,6 +2022,129 @@ void main() {
 
     semantics.dispose();
   });
+
+  testWidgets('NavigationRailDestination padding properly applied - NavigationRailLabelType.all', (WidgetTester tester) async {
+    const EdgeInsets defaultPadding = EdgeInsets.symmetric(horizontal: 8.0);
+    const EdgeInsets secondItemPadding = EdgeInsets.symmetric(vertical: 30.0);
+    const EdgeInsets thirdItemPadding = EdgeInsets.symmetric(horizontal: 10.0);
+
+    await _pumpNavigationRail(
+      tester,
+      navigationRail: NavigationRail(
+        labelType: NavigationRailLabelType.all,
+        selectedIndex: 0,
+        destinations: const <NavigationRailDestination>[
+          NavigationRailDestination(
+            icon: Icon(Icons.favorite_border),
+            selectedIcon: Icon(Icons.favorite),
+            label: Text('Abc'),
+          ),
+          NavigationRailDestination(
+            icon: Icon(Icons.bookmark_border),
+            selectedIcon: Icon(Icons.bookmark),
+            label: Text('Def'),
+            padding: secondItemPadding,
+          ),
+          NavigationRailDestination(
+            icon: Icon(Icons.star_border),
+            selectedIcon: Icon(Icons.star),
+            label: Text('Ghi'),
+            padding: thirdItemPadding,
+          ),
+        ],
+      ),
+    );
+
+    final Padding firstItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Abc'));
+    final Padding secondItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Def'));
+    final Padding thirdItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Ghi'));
+
+    expect(firstItem.padding, defaultPadding);
+    expect(secondItem.padding, secondItemPadding);
+    expect(thirdItem.padding, thirdItemPadding);
+  });
+
+  testWidgets('NavigationRailDestination padding properly applied - NavigationRailLabelType.selected', (WidgetTester tester) async {
+    const EdgeInsets defaultPadding = EdgeInsets.symmetric(horizontal: 8.0);
+    const EdgeInsets secondItemPadding = EdgeInsets.symmetric(vertical: 30.0);
+    const EdgeInsets thirdItemPadding = EdgeInsets.symmetric(horizontal: 10.0);
+
+    await _pumpNavigationRail(
+      tester,
+      navigationRail: NavigationRail(
+        labelType: NavigationRailLabelType.selected,
+        selectedIndex: 0,
+        destinations: const <NavigationRailDestination>[
+          NavigationRailDestination(
+            icon: Icon(Icons.favorite_border),
+            selectedIcon: Icon(Icons.favorite),
+            label: Text('Abc'),
+          ),
+          NavigationRailDestination(
+            icon: Icon(Icons.bookmark_border),
+            selectedIcon: Icon(Icons.bookmark),
+            label: Text('Def'),
+            padding: secondItemPadding,
+          ),
+          NavigationRailDestination(
+            icon: Icon(Icons.star_border),
+            selectedIcon: Icon(Icons.star),
+            label: Text('Ghi'),
+            padding: thirdItemPadding,
+          ),
+        ],
+      ),
+    );
+
+    final Padding firstItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Abc'));
+    final Padding secondItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Def'));
+    final Padding thirdItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Ghi'));
+
+    expect(firstItem.padding, defaultPadding);
+    expect(secondItem.padding, secondItemPadding);
+    expect(thirdItem.padding, thirdItemPadding);
+  });
+
+  testWidgets('NavigationRailDestination padding properly applied - NavigationRailLabelType.none', (WidgetTester tester) async {
+    const EdgeInsets defaultPadding = EdgeInsets.zero;
+    const EdgeInsets secondItemPadding = EdgeInsets.symmetric(vertical: 30.0);
+    const EdgeInsets thirdItemPadding = EdgeInsets.symmetric(horizontal: 10.0);
+
+    await _pumpNavigationRail(
+      tester,
+      navigationRail: NavigationRail(
+        labelType: NavigationRailLabelType.none,
+        selectedIndex: 0,
+        destinations: const <NavigationRailDestination>[
+          NavigationRailDestination(
+            icon: Icon(Icons.favorite_border),
+            selectedIcon: Icon(Icons.favorite),
+            label: Text('Abc'),
+          ),
+          NavigationRailDestination(
+            icon: Icon(Icons.bookmark_border),
+            selectedIcon: Icon(Icons.bookmark),
+            label: Text('Def'),
+            padding: secondItemPadding,
+          ),
+          NavigationRailDestination(
+            icon: Icon(Icons.star_border),
+            selectedIcon: Icon(Icons.star),
+            label: Text('Ghi'),
+            padding: thirdItemPadding,
+          ),
+        ],
+      ),
+    );
+
+    final Padding firstItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Abc'));
+    final Padding secondItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Def'));
+    final Padding thirdItem = tester.widget<Padding>(find.widgetWithText(Padding, 'Ghi'));
+
+    expect(firstItem.padding, defaultPadding);
+    expect(secondItem.padding, secondItemPadding);
+    expect(thirdItem.padding, thirdItemPadding);
+  });
 }
 
 TestSemantics _expectedSemantics() {