Add parameter to Scaffold so its possible to disable open Drawer drag gesture (#50925)

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

@@ -232,6 +232,7 @@ class DrawerController extends StatefulWidget {
     this.dragStartBehavior = DragStartBehavior.start,
     this.scrimColor,
     this.edgeDragWidth,
+    this.enableOpenDragGesture = true,
   }) : assert(child != null),
        assert(dragStartBehavior != null),
        assert(alignment != null),
@@ -278,6 +279,11 @@ class DrawerController extends StatefulWidget {
   /// By default, the color used is [Colors.black54]
   final Color scrimColor;
 
+  /// Determines if the [Drawer] can be opened with a drag gesture.
+  ///
+  /// By default, the drag gesture is enabled.
+  final bool enableOpenDragGesture;
+
   /// The width of the area within which a horizontal swipe will open the
   /// drawer.
   ///
@@ -505,6 +511,7 @@ class DrawerControllerState extends State<DrawerController> with SingleTickerPro
     }
 
     if (_controller.status == AnimationStatus.dismissed) {
+      if (widget.enableOpenDragGesture) {
         return Align(
           alignment: _drawerOuterAlignment,
           child: GestureDetector(
@@ -517,6 +524,9 @@ class DrawerControllerState extends State<DrawerController> with SingleTickerPro
             child: Container(width: dragAreaWidth),
           ),
         );
+      } else {
+        return const SizedBox.shrink();
+      }
     } else {
       bool platformHasBackButton;
       switch (Theme.of(context).platform) {

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

@@ -1011,6 +1011,8 @@ class Scaffold extends StatefulWidget {
     this.extendBodyBehindAppBar = false,
     this.drawerScrimColor,
     this.drawerEdgeDragWidth,
+    this.drawerEnableOpenDragGesture = true,
+    this.endDrawerEnableOpenDragGesture = true,
   }) : assert(primary != null),
        assert(extendBody != null),
        assert(extendBodyBehindAppBar != null),
@@ -1113,9 +1115,10 @@ class Scaffold extends StatefulWidget {
   /// To close the drawer, use [Navigator.pop].
   ///
   /// {@tool dartpad --template=stateful_widget_material}
-  /// To disable the drawer edge swipe, set the [Scaffold.drawerEdgeWidth] to 0.
-  /// Then, use [ScaffoldState.openDrawer] to open the drawer and
-  /// [Navigator.pop] to close it.
+  /// To disable the drawer edge swipe, set the
+  /// [Scaffold.drawerEnableOpenDragGesture] to false. Then, use
+  /// [ScaffoldState.openDrawer] to open the drawer and [Navigator.pop] to close
+  /// it.
   ///
   /// ```dart
   /// final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
@@ -1153,7 +1156,8 @@ class Scaffold extends StatefulWidget {
   ///         ),
   ///       ),
   ///     ),
-  ///     drawerEdgeDragWidth: 0.0, // Disable opening the drawer with a swipe gesture.
+  ///     // Disable opening the drawer with a swipe gesture.
+  ///     drawerEnableOpenDragGesture: false,
   ///   );
   /// }
   /// ```
@@ -1171,9 +1175,10 @@ class Scaffold extends StatefulWidget {
   /// To close the drawer, use [Navigator.pop].
   ///
   /// {@tool dartpad --template=stateful_widget_material}
-  /// To disable the drawer edge swipe, set the [Scaffold.drawerEdgeWidth]
-  /// to 0. Then, use [ScaffoldState.openEndDrawer] to open the drawer and
-  /// [Navigator.pop] to close it.
+  /// To disable the drawer edge swipe, set the
+  /// [Scaffold.endDrawerEnableOpenDragGesture] to false. Then, use
+  /// [ScaffoldState.openEndDrawer] to open the drawer and [Navigator.pop] to
+  /// close it.
   ///
   /// ```dart
   /// final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
@@ -1211,7 +1216,8 @@ class Scaffold extends StatefulWidget {
   ///         ),
   ///       ),
   ///     ),
-  ///     drawerEdgeDragWidth: 0.0, // Disable opening the drawer with a swipe gesture.
+  ///     // Disable opening the end drawer with a swipe gesture.
+  ///     endDrawerEnableOpenDragGesture: false,
   ///   );
   /// }
   /// ```
@@ -1313,6 +1319,18 @@ class Scaffold extends StatefulWidget {
   /// 20.0 will be added to `MediaQuery.of(context).padding.left`.
   final double drawerEdgeDragWidth;
 
+  /// Determines if the [Scaffold.drawer] can be opened with a drag
+  /// gesture.
+  ///
+  /// By default, the drag gesture is enabled.
+  final bool drawerEnableOpenDragGesture;
+
+  /// Determines if the [Scaffold.endDrawer] can be opened with a
+  /// drag gesture.
+  ///
+  /// By default, the drag gesture is enabled.
+  final bool endDrawerEnableOpenDragGesture;
+
   /// This flag is deprecated and fixes and issue with incorrect clipping
   /// and positioning of the [SnackBar] set to [SnackBarBehavior.floating].
   @Deprecated(
@@ -2230,6 +2248,7 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin {
           dragStartBehavior: widget.drawerDragStartBehavior,
           scrimColor: widget.drawerScrimColor,
           edgeDragWidth: widget.drawerEdgeDragWidth,
+          enableOpenDragGesture: widget.endDrawerEnableOpenDragGesture,
         ),
         _ScaffoldSlot.endDrawer,
         // remove the side padding from the side we're not touching
@@ -2254,6 +2273,7 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin {
           dragStartBehavior: widget.drawerDragStartBehavior,
           scrimColor: widget.drawerScrimColor,
           edgeDragWidth: widget.drawerEdgeDragWidth,
+          enableOpenDragGesture: widget.drawerEnableOpenDragGesture,
         ),
         _ScaffoldSlot.drawer,
         // remove the side padding from the side we're not touching

packages/flutter/test/material/scaffold_test.dart

@@ -1596,6 +1596,142 @@ void main() {
     expect(scaffoldState.isDrawerOpen, true);
   });
 
+  testWidgets('Drawer does not open with a drag gesture when it is disabled', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          drawer: const Drawer(
+            child: Text('Drawer'),
+          ),
+          drawerEnableOpenDragGesture: true,
+          body: const Text('Scaffold Body'),
+          appBar: AppBar(
+            centerTitle: true,
+            title: const Text('Title'),
+          ),
+        ),
+      ),
+    );
+    ScaffoldState scaffoldState = tester.state(find.byType(Scaffold));
+    expect(scaffoldState.isDrawerOpen, false);
+
+    // Test that we can open the drawer with a drag gesture when
+    // `Scaffold.drawerEnableDragGesture` is true.
+    await tester.dragFrom(const Offset(0, 100), const Offset(300, 0));
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isDrawerOpen, true);
+
+    await tester.dragFrom(const Offset(300, 100), const Offset(-300, 0));
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isDrawerOpen, false);
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          drawer: const Drawer(
+            child: Text('Drawer'),
+          ),
+          drawerEnableOpenDragGesture: false,
+          body: const Text('Scaffold body'),
+          appBar: AppBar(
+            centerTitle: true,
+            title: const Text('Title'),
+          ),
+        ),
+      ),
+    );
+    scaffoldState = tester.state(find.byType(Scaffold));
+    expect(scaffoldState.isDrawerOpen, false);
+
+    // Test that we cannot open the drawer with a drag gesture when
+    // `Scaffold.drawerEnableDragGesture` is false.
+    await tester.dragFrom(const Offset(0, 100), const Offset(300, 0));
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isDrawerOpen, false);
+
+    // Test that we can close drawer with a drag gesture when
+    // `Scaffold.drawerEnableDragGesture` is false.
+    final Finder drawerOpenButton = find.byType(IconButton).first;
+    await tester.tap(drawerOpenButton);
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isDrawerOpen, true);
+
+    await tester.dragFrom(const Offset(300, 100), const Offset(-300, 0));
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isDrawerOpen, false);
+  });
+
+  testWidgets('End drawer does not open with a drag gesture when it is disabled', (WidgetTester tester) async {
+    double screenWidth;
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Builder(
+          builder: (BuildContext context) {
+            screenWidth = MediaQuery.of(context).size.width;
+            return Scaffold(
+              endDrawer: const Drawer(
+                child: Text('Drawer'),
+              ),
+              endDrawerEnableOpenDragGesture: true,
+              body: const Text('Scaffold Body'),
+              appBar: AppBar(
+                centerTitle: true,
+                title: const Text('Title'),
+              ),
+            );
+          }
+        ),
+      ),
+    );
+    ScaffoldState scaffoldState = tester.state(find.byType(Scaffold));
+    expect(scaffoldState.isEndDrawerOpen, false);
+
+    // Test that we can open the end drawer with a drag gesture when
+    // `Scaffold.endDrawerEnableDragGesture` is true.
+    await tester.dragFrom(Offset(screenWidth - 1, 100), const Offset(-300, 0));
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isEndDrawerOpen, true);
+
+    await tester.dragFrom(Offset(screenWidth - 300, 100), const Offset(300, 0));
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isEndDrawerOpen, false);
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          endDrawer: const Drawer(
+            child: Text('Drawer'),
+          ),
+          endDrawerEnableOpenDragGesture: false,
+          body: const Text('Scaffold body'),
+          appBar: AppBar(
+            centerTitle: true,
+            title: const Text('Title'),
+          ),
+        ),
+      ),
+    );
+    scaffoldState = tester.state(find.byType(Scaffold));
+    expect(scaffoldState.isEndDrawerOpen, false);
+
+    // Test that we cannot open the end drawer with a drag gesture when
+    // `Scaffold.endDrawerEnableDragGesture` is false.
+    await tester.dragFrom(Offset(screenWidth - 1, 100), const Offset(-300, 0));
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isEndDrawerOpen, false);
+
+    // Test that we can close the end drawer a with drag gesture when
+    // `Scaffold.endDrawerEnableDragGesture` is false.
+    final Finder endDrawerOpenButton = find.byType(IconButton).first;
+    await tester.tap(endDrawerOpenButton);
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isEndDrawerOpen, true);
+
+    await tester.dragFrom(Offset(screenWidth - 300, 100), const Offset(300, 0));
+    await tester.pumpAndSettle();
+    expect(scaffoldState.isEndDrawerOpen, false);
+  });
+
   testWidgets('Nested scaffold body insets', (WidgetTester tester) async {
     // Regression test for https://github.com/flutter/flutter/issues/20295
     final Key bodyKey = UniqueKey();