Add buttons customization to WidgetController and related testing classes (#31095)

* Add buttons to WidgetController and TestPointer

* Add more buttons

* Let TestPointer handle default device

* Use getter only buttons

examples/flutter_gallery/test/live_smoketest.dart

@@ -15,6 +15,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
+import 'package:flutter/gestures.dart' show kPrimaryButton;
 import 'package:flutter_test/flutter_test.dart';
 
 import 'package:flutter_gallery/gallery/demos.dart';
@@ -132,8 +133,8 @@ class _LiveWidgetController extends LiveWidgetController {
   }
 
   @override
-  Future<void> tap(Finder finder, { int pointer }) async {
-    await super.tap(await _waitForElement(finder), pointer: pointer);
+  Future<void> tap(Finder finder, { int pointer, int buttons = kPrimaryButton }) async {
+    await super.tap(await _waitForElement(finder), pointer: pointer, buttons: buttons);
   }
 
   Future<void> scrollIntoView(Finder finder, {double alignment}) async {

packages/flutter_test/lib/src/controller.dart

@@ -252,14 +252,14 @@ abstract class WidgetController {
   ///
   /// If the center of the widget is not exposed, this might send events to
   /// another object.
-  Future<void> tap(Finder finder, {int pointer}) {
-    return tapAt(getCenter(finder), pointer: pointer);
+  Future<void> tap(Finder finder, {int pointer, int buttons = kPrimaryButton}) {
+    return tapAt(getCenter(finder), pointer: pointer, buttons: buttons);
   }
 
   /// Dispatch a pointer down / pointer up sequence at the given location.
-  Future<void> tapAt(Offset location, {int pointer}) {
+  Future<void> tapAt(Offset location, {int pointer, int buttons = kPrimaryButton}) {
     return TestAsyncUtils.guard<void>(() async {
-      final TestGesture gesture = await startGesture(location, pointer: pointer);
+      final TestGesture gesture = await startGesture(location, pointer: pointer, buttons: buttons);
       await gesture.up();
     });
   }
@@ -269,9 +269,9 @@ abstract class WidgetController {
   ///
   /// If the center of the widget is not exposed, this might send events to
   /// another object.
-  Future<TestGesture> press(Finder finder, {int pointer}) {
+  Future<TestGesture> press(Finder finder, {int pointer, int buttons = kPrimaryButton}) {
     return TestAsyncUtils.guard<TestGesture>(() {
-      return startGesture(getCenter(finder), pointer: pointer);
+      return startGesture(getCenter(finder), pointer: pointer, buttons: buttons);
     });
   }
 
@@ -281,15 +281,15 @@ abstract class WidgetController {
   ///
   /// If the center of the widget is not exposed, this might send events to
   /// another object.
-  Future<void> longPress(Finder finder, {int pointer}) {
-    return longPressAt(getCenter(finder), pointer: pointer);
+  Future<void> longPress(Finder finder, {int pointer, int buttons = kPrimaryButton}) {
+    return longPressAt(getCenter(finder), pointer: pointer, buttons: buttons);
   }
 
   /// Dispatch a pointer down / pointer up sequence at the given location with
   /// a delay of [kLongPressTimeout] + [kPressTimeout] between the two events.
-  Future<void> longPressAt(Offset location, {int pointer}) {
+  Future<void> longPressAt(Offset location, {int pointer, int buttons = kPrimaryButton}) {
     return TestAsyncUtils.guard<void>(() async {
-      final TestGesture gesture = await startGesture(location, pointer: pointer);
+      final TestGesture gesture = await startGesture(location, pointer: pointer, buttons: buttons);
       await pump(kLongPressTimeout + kPressTimeout);
       await gesture.up();
     });
@@ -320,6 +320,7 @@ abstract class WidgetController {
     Offset offset,
     double speed, {
     int pointer,
+    int buttons = kPrimaryButton,
     Duration frameInterval = const Duration(milliseconds: 16),
     Offset initialOffset = Offset.zero,
     Duration initialOffsetDelay = const Duration(seconds: 1),
@@ -329,6 +330,7 @@ abstract class WidgetController {
       offset,
       speed,
       pointer: pointer,
+      buttons: buttons,
       frameInterval: frameInterval,
       initialOffset: initialOffset,
       initialOffsetDelay: initialOffsetDelay,
@@ -365,6 +367,7 @@ abstract class WidgetController {
     Offset offset,
     double speed, {
     int pointer,
+    int buttons = kPrimaryButton,
     Duration frameInterval = const Duration(milliseconds: 16),
     Offset initialOffset = Offset.zero,
     Duration initialOffsetDelay = const Duration(seconds: 1),
@@ -372,7 +375,7 @@ abstract class WidgetController {
     assert(offset.distance > 0.0);
     assert(speed > 0.0); // speed is pixels/second
     return TestAsyncUtils.guard<void>(() async {
-      final TestPointer testPointer = TestPointer(pointer ?? _getNextPointer());
+      final TestPointer testPointer = TestPointer(pointer ?? _getNextPointer(), PointerDeviceKind.touch, null, buttons);
       final HitTestResult result = hitTestOnBinding(startLocation);
       const int kMoveCount = 50; // Needs to be >= kHistorySize, see _LeastSquaresVelocityTrackerStrategy
       final double timeStampDelta = 1000.0 * offset.distance / (kMoveCount * speed);
@@ -434,9 +437,23 @@ abstract class WidgetController {
   /// 'touchSlopY' variables should be set to 0. However, generally, these values
   /// should be left to their default values.
   /// {@end template}
-  Future<void> drag(Finder finder, Offset offset, { int pointer, double touchSlopX = kDragSlopDefault, double touchSlopY = kDragSlopDefault }) {
+  Future<void> drag(
+    Finder finder,
+    Offset offset, {
+    int pointer,
+    int buttons = kPrimaryButton,
+    double touchSlopX = kDragSlopDefault,
+    double touchSlopY = kDragSlopDefault,
+  }) {
     assert(kDragSlopDefault > kTouchSlop);
-    return dragFrom(getCenter(finder), offset, pointer: pointer, touchSlopX: touchSlopX, touchSlopY: touchSlopY);
+    return dragFrom(
+      getCenter(finder),
+      offset,
+      pointer: pointer,
+      buttons: buttons,
+      touchSlopX: touchSlopX,
+      touchSlopY: touchSlopY,
+    );
   }
 
   /// Attempts a drag gesture consisting of a pointer down, a move by
@@ -447,10 +464,17 @@ abstract class WidgetController {
   /// instead.
   ///
   /// {@macro flutter.flutter_test.drag}
-  Future<void> dragFrom(Offset startLocation, Offset offset, { int pointer, double touchSlopX = kDragSlopDefault, double touchSlopY = kDragSlopDefault }) {
+  Future<void> dragFrom(
+    Offset startLocation,
+    Offset offset, {
+    int pointer,
+    int buttons = kPrimaryButton,
+    double touchSlopX = kDragSlopDefault,
+    double touchSlopY = kDragSlopDefault,
+  }) {
     assert(kDragSlopDefault > kTouchSlop);
     return TestAsyncUtils.guard<void>(() async {
-      final TestGesture gesture = await startGesture(startLocation, pointer: pointer);
+      final TestGesture gesture = await startGesture(startLocation, pointer: pointer, buttons: buttons);
       assert(gesture != null);
 
       final double xSign = offset.dx.sign;
@@ -538,14 +562,18 @@ abstract class WidgetController {
   ///
   /// You can use [startGesture] instead if your gesture begins with a down
   /// event.
-  Future<TestGesture> createGesture({int pointer, PointerDeviceKind kind = PointerDeviceKind.touch}) async {
-    final TestGesture gesture = TestGesture(
+  Future<TestGesture> createGesture({
+    int pointer,
+    PointerDeviceKind kind = PointerDeviceKind.touch,
+    int buttons = kPrimaryButton,
+  }) async {
+    return TestGesture(
       hitTester: hitTestOnBinding,
       dispatcher: sendEventToBinding,
       kind: kind,
       pointer: pointer ?? _getNextPointer(),
+      buttons: buttons,
     );
-    return gesture;
   }
 
   /// Creates a gesture with an initial down gesture at a particular point, and
@@ -558,8 +586,13 @@ abstract class WidgetController {
     Offset downLocation, {
     int pointer,
     PointerDeviceKind kind = PointerDeviceKind.touch,
+    int buttons = kPrimaryButton,
   }) async {
-    final TestGesture result = await createGesture(pointer: pointer, kind: kind);
+    final TestGesture result = await createGesture(
+      pointer: pointer,
+      kind: kind,
+      buttons: buttons,
+    );
     await result.down(downLocation);
     return result;
   }

packages/flutter_test/lib/src/test_pointer.dart

@@ -26,8 +26,12 @@ class TestPointer {
     this.pointer = 1,
     this.kind = PointerDeviceKind.touch,
     this._device,
-  ])  : assert(kind != null),
-        assert(pointer != null) {
+    int buttons = kPrimaryButton,
+  ])
+      : assert(kind != null),
+        assert(pointer != null),
+        assert(buttons != null),
+        _buttons = buttons {
     switch (kind) {
       case PointerDeviceKind.mouse:
         _device ??= 1;
@@ -57,6 +61,11 @@ class TestPointer {
   /// [PointerDeviceKind.touch].
   final PointerDeviceKind kind;
 
+  /// The kind of buttons to simulate on Down and Move events. Defaults to
+  /// [kPrimaryButton].
+  int get buttons => _buttons;
+  int _buttons;
+
   /// Whether the pointer simulated by this object is currently down.
   ///
   /// A pointer is released (goes up) by calling [up] or [cancel].
@@ -73,8 +82,14 @@ class TestPointer {
 
   /// If a custom event is created outside of this class, this function is used
   /// to set the [isDown].
-  bool setDownInfo(PointerEvent event, Offset newLocation) {
+  bool setDownInfo(
+    PointerEvent event,
+    Offset newLocation, {
+    int buttons,
+  }) {
     _location = newLocation;
+    if (buttons != null)
+      _buttons = buttons;
     switch (event.runtimeType) {
       case PointerDownEvent:
         assert(!isDown);
@@ -95,16 +110,26 @@ class TestPointer {
   ///
   /// By default, the time stamp on the event is [Duration.zero]. You can give a
   /// specific time stamp by passing the `timeStamp` argument.
-  PointerDownEvent down(Offset newLocation, { Duration timeStamp = Duration.zero }) {
+  ///
+  /// By default, the set of buttons in the last down or move event is used.
+  /// You can give a specific set of buttons by passing the `buttons` argument.
+  PointerDownEvent down(
+    Offset newLocation, {
+    Duration timeStamp = Duration.zero,
+    int buttons,
+  }) {
     assert(!isDown);
     _isDown = true;
     _location = newLocation;
+    if (buttons != null)
+      _buttons = buttons;
     return PointerDownEvent(
       timeStamp: timeStamp,
       kind: kind,
       device: _device,
       pointer: pointer,
       position: location,
+      buttons: _buttons,
     );
   }
 
@@ -115,7 +140,14 @@ class TestPointer {
   ///
   /// [isDown] must be true when this is called, since move events can only
   /// be generated when the pointer is down.
-  PointerMoveEvent move(Offset newLocation, { Duration timeStamp = Duration.zero }) {
+  ///
+  /// By default, the set of buttons in the last down or move event is used.
+  /// You can give a specific set of buttons by passing the `buttons` argument.
+  PointerMoveEvent move(
+    Offset newLocation, {
+    Duration timeStamp = Duration.zero,
+    int buttons,
+  }) {
     assert(
         isDown,
         'Move events can only be generated when the pointer is down. To '
@@ -123,6 +155,8 @@ class TestPointer {
         'up, use hover() instead.');
     final Offset delta = newLocation - location;
     _location = newLocation;
+    if (buttons != null)
+      _buttons = buttons;
     return PointerMoveEvent(
       timeStamp: timeStamp,
       kind: kind,
@@ -130,6 +164,7 @@ class TestPointer {
       pointer: pointer,
       position: newLocation,
       delta: delta,
+      buttons: _buttons,
     );
   }
 
@@ -291,13 +326,16 @@ class TestGesture {
     @required HitTester hitTester,
     int pointer = 1,
     PointerDeviceKind kind = PointerDeviceKind.touch,
+    int device,
+    int buttons = kPrimaryButton,
   }) : assert(dispatcher != null),
        assert(hitTester != null),
        assert(pointer != null),
        assert(kind != null),
+       assert(buttons != null),
        _dispatcher = dispatcher,
        _hitTester = hitTester,
-       _pointer = TestPointer(pointer, kind),
+       _pointer = TestPointer(pointer, kind, device, buttons),
        _result = null;
 
   /// Dispatch a pointer down event at the given `downLocation`, caching the

packages/flutter_test/test/controller_test.dart

@@ -264,4 +264,154 @@ void main() {
       }
     },
   );
+
+  testWidgets(
+    'WidgetTester.tap must respect buttons',
+    (WidgetTester tester) async {
+      final List<String> logs = <String>[];
+
+      await tester.pumpWidget(
+        Directionality(
+          textDirection: TextDirection.ltr,
+          child: Listener(
+            onPointerDown: (PointerDownEvent event) => logs.add('down ${event.buttons}'),
+            onPointerMove: (PointerMoveEvent event) => logs.add('move ${event.buttons}'),
+            onPointerUp: (PointerUpEvent event) => logs.add('up ${event.buttons}'),
+            child: const Text('test'),
+          ),
+        ),
+      );
+
+      await tester.tap(find.text('test'), buttons: kSecondaryMouseButton);
+
+      const String b = '$kSecondaryMouseButton';
+      for(int i = 0; i < logs.length; i++) {
+        if (i == 0)
+          expect(logs[i], 'down $b');
+        else if (i != logs.length - 1)
+          expect(logs[i], 'move $b');
+        else
+          expect(logs[i], 'up 0');
+      }
+    },
+  );
+
+  testWidgets(
+    'WidgetTester.press must respect buttons',
+    (WidgetTester tester) async {
+      final List<String> logs = <String>[];
+
+      await tester.pumpWidget(
+        Directionality(
+          textDirection: TextDirection.ltr,
+          child: Listener(
+            onPointerDown: (PointerDownEvent event) => logs.add('down ${event.buttons}'),
+            onPointerMove: (PointerMoveEvent event) => logs.add('move ${event.buttons}'),
+            onPointerUp: (PointerUpEvent event) => logs.add('up ${event.buttons}'),
+            child: const Text('test'),
+          ),
+        ),
+      );
+
+      await tester.press(find.text('test'), buttons: kSecondaryMouseButton);
+
+      const String b = '$kSecondaryMouseButton';
+      expect(logs, equals(<String>['down $b']));
+    },
+  );
+
+  testWidgets(
+    'WidgetTester.longPress must respect buttons',
+    (WidgetTester tester) async {
+      final List<String> logs = <String>[];
+
+      await tester.pumpWidget(
+        Directionality(
+          textDirection: TextDirection.ltr,
+          child: Listener(
+            onPointerDown: (PointerDownEvent event) => logs.add('down ${event.buttons}'),
+            onPointerMove: (PointerMoveEvent event) => logs.add('move ${event.buttons}'),
+            onPointerUp: (PointerUpEvent event) => logs.add('up ${event.buttons}'),
+            child: const Text('test'),
+          ),
+        ),
+      );
+
+      await tester.longPress(find.text('test'), buttons: kSecondaryMouseButton);
+      await tester.pumpAndSettle();
+
+      const String b = '$kSecondaryMouseButton';
+      for(int i = 0; i < logs.length; i++) {
+        if (i == 0)
+          expect(logs[i], 'down $b');
+        else if (i != logs.length - 1)
+          expect(logs[i], 'move $b');
+        else
+          expect(logs[i], 'up 0');
+      }
+    },
+  );
+
+  testWidgets(
+    'WidgetTester.drag must respect buttons',
+    (WidgetTester tester) async {
+      final List<String> logs = <String>[];
+
+      await tester.pumpWidget(
+        Directionality(
+          textDirection: TextDirection.ltr,
+          child: Listener(
+            onPointerDown: (PointerDownEvent event) => logs.add('down ${event.buttons}'),
+            onPointerMove: (PointerMoveEvent event) => logs.add('move ${event.buttons}'),
+            onPointerUp: (PointerUpEvent event) => logs.add('up ${event.buttons}'),
+            child: const Text('test'),
+          ),
+        ),
+      );
+
+      await tester.drag(find.text('test'), const Offset(-150.0, 200.0), buttons: kSecondaryMouseButton);
+
+      const String b = '$kSecondaryMouseButton';
+      for(int i = 0; i < logs.length; i++) {
+        if (i == 0)
+          expect(logs[i], 'down $b');
+        else if (i != logs.length - 1)
+          expect(logs[i], 'move $b');
+        else
+          expect(logs[i], 'up 0');
+      }
+    },
+  );
+
+  testWidgets(
+    'WidgetTester.fling must respect buttons',
+    (WidgetTester tester) async {
+      final List<String> logs = <String>[];
+
+      await tester.pumpWidget(
+        Directionality(
+          textDirection: TextDirection.ltr,
+          child: Listener(
+            onPointerDown: (PointerDownEvent event) => logs.add('down ${event.buttons}'),
+            onPointerMove: (PointerMoveEvent event) => logs.add('move ${event.buttons}'),
+            onPointerUp: (PointerUpEvent event) => logs.add('up ${event.buttons}'),
+            child: const Text('test'),
+          ),
+        ),
+      );
+
+      await tester.fling(find.text('test'), const Offset(-10.0, 0.0), 1000.0, buttons: kSecondaryMouseButton);
+      await tester.pumpAndSettle();
+
+      const String b = '$kSecondaryMouseButton';
+      for(int i = 0; i < logs.length; i++) {
+        if (i == 0)
+          expect(logs[i], 'down $b');
+        else if (i != logs.length - 1)
+          expect(logs[i], 'move $b');
+        else
+          expect(logs[i], 'up 0');
+      }
+    },
+  );
 }