Text selection via mouse (#28290)

packages/flutter/lib/src/gestures/eager.dart

@@ -12,8 +12,13 @@ import 'recognizer.dart';
 /// all touch events inside the view bounds to the embedded Android view.
 /// See [AndroidView.gestureRecognizers] for more details.
 class EagerGestureRecognizer extends OneSequenceGestureRecognizer {
+  /// Create an eager gesture recognizer.
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
+  EagerGestureRecognizer({ PointerDeviceKind kind }): super(kind: kind);
+
   @override
-  void addPointer(PointerDownEvent event) {
+  void addAllowedPointer(PointerDownEvent event) {
     // We call startTrackingPointer as this is where OneSequenceGestureRecognizer joins the arena.
     startTrackingPointer(event.pointer);
     resolve(GestureDisposition.accepted);

packages/flutter/lib/src/gestures/force_press.dart

@@ -116,16 +116,19 @@ class ForcePressGestureRecognizer extends OneSequenceGestureRecognizer {
   /// The [interpolation] callback must always return a value in the range 0.0
   /// to 1.0 for values of `pressure` that are between `pressureMin` and
   /// `pressureMax`.
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
   ForcePressGestureRecognizer({
     this.startPressure = 0.4,
     this.peakPressure = 0.85,
     this.interpolation = _inverseLerp,
     Object debugOwner,
+    PointerDeviceKind kind,
   }) : assert(startPressure != null),
        assert(peakPressure != null),
        assert(interpolation != null),
        assert(peakPressure > startPressure),
-       super(debugOwner: debugOwner);
+       super(debugOwner: debugOwner, kind: kind);
 
   /// A pointer is in contact with the screen and has just pressed with a force
   /// exceeding the [startPressure]. Consequently, if there were other gesture
@@ -205,7 +208,7 @@ class ForcePressGestureRecognizer extends OneSequenceGestureRecognizer {
   _ForceState _state = _ForceState.ready;
 
   @override
-  void addPointer(PointerEvent event) {
+  void addAllowedPointer(PointerEvent event) {
     // If the device has a maximum pressure of less than or equal to 1, it
     // doesn't have touch pressure sensing capabilities. Do not participate
     // in the gesture arena.

packages/flutter/lib/src/gestures/long_press.dart

@@ -123,10 +123,12 @@ class LongPressGestureRecognizer extends PrimaryPointerGestureRecognizer {
   /// can be moved without limit once the long press is accepted.
   LongPressGestureRecognizer({
     double postAcceptSlopTolerance,
+    PointerDeviceKind kind,
     Object debugOwner,
   }) : super(
     deadline: kLongPressTimeout,
     postAcceptSlopTolerance: postAcceptSlopTolerance,
+    kind: kind,
     debugOwner: debugOwner,
   );
 

packages/flutter/lib/src/gestures/monodrag.dart

@@ -52,11 +52,14 @@ abstract class DragGestureRecognizer extends OneSequenceGestureRecognizer {
   /// Initialize the object.
   ///
   /// [dragStartBehavior] must not be null.
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
   DragGestureRecognizer({
     Object debugOwner,
+    PointerDeviceKind kind,
     this.dragStartBehavior = DragStartBehavior.start,
   }) : assert(dragStartBehavior != null),
-       super(debugOwner: debugOwner);
+       super(debugOwner: debugOwner, kind: kind);
 
   /// Configure the behavior of offsets sent to [onStart].
   ///
@@ -147,7 +150,7 @@ abstract class DragGestureRecognizer extends OneSequenceGestureRecognizer {
   final Map<int, VelocityTracker> _velocityTrackers = <int, VelocityTracker>{};
 
   @override
-  void addPointer(PointerEvent event) {
+  void addAllowedPointer(PointerEvent event) {
     startTrackingPointer(event.pointer);
     _velocityTrackers[event.pointer] = VelocityTracker();
     if (_state == _DragState.ready) {
@@ -296,7 +299,12 @@ abstract class DragGestureRecognizer extends OneSequenceGestureRecognizer {
 ///    track each touch point independently.
 class VerticalDragGestureRecognizer extends DragGestureRecognizer {
   /// Create a gesture recognizer for interactions in the vertical axis.
-  VerticalDragGestureRecognizer({ Object debugOwner }) : super(debugOwner: debugOwner);
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
+  VerticalDragGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   @override
   bool _isFlingGesture(VelocityEstimate estimate) {
@@ -330,7 +338,12 @@ class VerticalDragGestureRecognizer extends DragGestureRecognizer {
 ///    track each touch point independently.
 class HorizontalDragGestureRecognizer extends DragGestureRecognizer {
   /// Create a gesture recognizer for interactions in the horizontal axis.
-  HorizontalDragGestureRecognizer({ Object debugOwner }) : super(debugOwner: debugOwner);
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
+  HorizontalDragGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   @override
   bool _isFlingGesture(VelocityEstimate estimate) {

packages/flutter/lib/src/gestures/multidrag.dart

@@ -189,7 +189,10 @@ abstract class MultiDragPointerState {
 ///    start after a long-press gesture.
 abstract class MultiDragGestureRecognizer<T extends MultiDragPointerState> extends GestureRecognizer {
   /// Initialize the object.
-  MultiDragGestureRecognizer({ @required Object debugOwner }) : super(debugOwner: debugOwner);
+  MultiDragGestureRecognizer({
+    @required Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   /// Called when this class recognizes the start of a drag gesture.
   ///
@@ -200,7 +203,7 @@ abstract class MultiDragGestureRecognizer<T extends MultiDragPointerState> exten
   Map<int, T> _pointers = <int, T>{};
 
   @override
-  void addPointer(PointerDownEvent event) {
+  void addAllowedPointer(PointerDownEvent event) {
     assert(_pointers != null);
     assert(event.pointer != null);
     assert(event.position != null);
@@ -334,7 +337,10 @@ class _ImmediatePointerState extends MultiDragPointerState {
 ///    start after a long-press gesture.
 class ImmediateMultiDragGestureRecognizer extends MultiDragGestureRecognizer<_ImmediatePointerState> {
   /// Create a gesture recognizer for tracking multiple pointers at once.
-  ImmediateMultiDragGestureRecognizer({ Object debugOwner }) : super(debugOwner: debugOwner);
+  ImmediateMultiDragGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   @override
   _ImmediatePointerState createNewPointerState(PointerDownEvent event) {
@@ -380,7 +386,10 @@ class _HorizontalPointerState extends MultiDragPointerState {
 class HorizontalMultiDragGestureRecognizer extends MultiDragGestureRecognizer<_HorizontalPointerState> {
   /// Create a gesture recognizer for tracking multiple pointers at once
   /// but only if they first move horizontally.
-  HorizontalMultiDragGestureRecognizer({ Object debugOwner }) : super(debugOwner: debugOwner);
+  HorizontalMultiDragGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   @override
   _HorizontalPointerState createNewPointerState(PointerDownEvent event) {
@@ -426,7 +435,10 @@ class _VerticalPointerState extends MultiDragPointerState {
 class VerticalMultiDragGestureRecognizer extends MultiDragGestureRecognizer<_VerticalPointerState> {
   /// Create a gesture recognizer for tracking multiple pointers at once
   /// but only if they first move vertically.
-  VerticalMultiDragGestureRecognizer({ Object debugOwner }) : super(debugOwner: debugOwner);
+  VerticalMultiDragGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   @override
   _VerticalPointerState createNewPointerState(PointerDownEvent event) {
@@ -528,8 +540,9 @@ class DelayedMultiDragGestureRecognizer extends MultiDragGestureRecognizer<_Dela
   DelayedMultiDragGestureRecognizer({
     this.delay = kLongPressTimeout,
     Object debugOwner,
+    PointerDeviceKind kind,
   }) : assert(delay != null),
-       super(debugOwner: debugOwner);
+       super(debugOwner: debugOwner, kind: kind);
 
   /// The amount of time the pointer must remain in the same place for the drag
   /// to be recognized.

packages/flutter/lib/src/gestures/multitap.dart

@@ -69,7 +69,12 @@ class _TapTracker {
 /// quick succession.
 class DoubleTapGestureRecognizer extends GestureRecognizer {
   /// Create a gesture recognizer for double taps.
-  DoubleTapGestureRecognizer({ Object debugOwner }) : super(debugOwner: debugOwner);
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
+  DoubleTapGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   // Implementation notes:
   // The double tap recognizer can be in one of four states. There's no
@@ -100,7 +105,7 @@ class DoubleTapGestureRecognizer extends GestureRecognizer {
   final Map<int, _TapTracker> _trackers = <int, _TapTracker>{};
 
   @override
-  void addPointer(PointerEvent event) {
+  void addAllowedPointer(PointerEvent event) {
     // Ignore out-of-bounds second taps.
     if (_firstTap != null &&
         !_firstTap.isWithinTolerance(event, kDoubleTapSlop))
@@ -318,7 +323,8 @@ class MultiTapGestureRecognizer extends GestureRecognizer {
   MultiTapGestureRecognizer({
     this.longTapDelay = Duration.zero,
     Object debugOwner,
-  }) : super(debugOwner: debugOwner);
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   /// A pointer that might cause a tap has contacted the screen at a particular
   /// location.
@@ -345,7 +351,7 @@ class MultiTapGestureRecognizer extends GestureRecognizer {
   final Map<int, _TapGesture> _gestureMap = <int, _TapGesture>{};
 
   @override
-  void addPointer(PointerEvent event) {
+  void addAllowedPointer(PointerEvent event) {
     assert(!_gestureMap.containsKey(event.pointer));
     _gestureMap[event.pointer] = _TapGesture(
       gestureRecognizer: this,

packages/flutter/lib/src/gestures/recognizer.dart

@@ -33,7 +33,7 @@ typedef RecognizerCallback<T> = T Function();
 ///
 ///   * [DragGestureRecognizer.dragStartBehavior], which gives an example for the different behaviors.
 enum DragStartBehavior {
-  /// Set the initial offset, at the position where the first down even was
+  /// Set the initial offset, at the position where the first down event was
   /// detected.
   down,
 
@@ -58,7 +58,13 @@ abstract class GestureRecognizer extends GestureArenaMember with DiagnosticableT
   ///
   /// The argument is optional and is only used for debug purposes (e.g. in the
   /// [toString] serialization).
-  GestureRecognizer({ this.debugOwner });
+  ///
+  /// {@template flutter.gestures.gestureRecognizer.kind}
+  /// It's possible to limit this recognizer to a specific [PointerDeviceKind]
+  /// by providing the optional [kind] argument. If [kind] is null,
+  /// the recognizer will accept pointer events from all device kinds.
+  /// {@endtemplate}
+  GestureRecognizer({ this.debugOwner, PointerDeviceKind kind }) : _kind = kind;
 
   /// The recognizer's owner.
   ///
@@ -66,6 +72,10 @@ abstract class GestureRecognizer extends GestureArenaMember with DiagnosticableT
   /// this gesture recognizer was created, to aid in debugging.
   final Object debugOwner;
 
+  /// The kind of device that's allowed to be recognized. If null, events from
+  /// all device kinds will be tracked and recognized.
+  final PointerDeviceKind _kind;
+
   /// Registers a new pointer that might be relevant to this gesture
   /// detector.
   ///
@@ -78,7 +88,43 @@ abstract class GestureRecognizer extends GestureArenaMember with DiagnosticableT
   /// subsequent events for this pointer, and to add the pointer to
   /// the global gesture arena manager (see [GestureArenaManager]) to track
   /// that pointer.
-  void addPointer(PointerDownEvent event);
+  ///
+  /// This method is called for each and all pointers being added. In
+  /// most cases, you want to override [addAllowedPointer] instead.
+  void addPointer(PointerDownEvent event) {
+    if (isPointerAllowed(event)) {
+      addAllowedPointer(event);
+    } else {
+      handleNonAllowedPointer(event);
+    }
+  }
+
+  /// Registers a new pointer that's been checked to be allowed by this gesture
+  /// recognizer.
+  ///
+  /// Subclasses of [GestureRecognizer] are supposed to override this method
+  /// instead of [addPointer] because [addPointer] will be called for each
+  /// pointer being added while [addAllowedPointer] is only called for pointers
+  /// that are allowed by this recognizer.
+  @protected
+  void addAllowedPointer(PointerDownEvent event) { }
+
+  /// Handles a pointer being added that's not allowed by this recognizer.
+  ///
+  /// Subclasses can override this method and reject the gesture.
+  ///
+  /// See:
+  /// - [OneSequenceGestureRecognizer.handleNonAllowedPointer].
+  @protected
+  void handleNonAllowedPointer(PointerDownEvent event) { }
+
+  /// Checks whether or not a pointer is allowed to be tracked by this recognizer.
+  @protected
+  bool isPointerAllowed(PointerDownEvent event) {
+    // Currently, it only checks for device kind. But in the future we could check
+    // for other things e.g. mouse button.
+    return _kind == null || _kind == event.kind;
+  }
 
   /// Releases any resources used by the object.
   ///
@@ -151,11 +197,21 @@ abstract class GestureRecognizer extends GestureArenaMember with DiagnosticableT
 /// simultaneous touches to each result in a separate tap.
 abstract class OneSequenceGestureRecognizer extends GestureRecognizer {
   /// Initialize the object.
-  OneSequenceGestureRecognizer({ Object debugOwner }) : super(debugOwner: debugOwner);
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
+  OneSequenceGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   final Map<int, GestureArenaEntry> _entries = <int, GestureArenaEntry>{};
   final Set<int> _trackedPointers = HashSet<int>();
 
+  @override
+  void handleNonAllowedPointer(PointerDownEvent event) {
+    resolve(GestureDisposition.rejected);
+  }
+
   /// Called when a pointer event is routed to this recognizer.
   @protected
   void handleEvent(PointerEvent event);
@@ -291,11 +347,14 @@ enum GestureRecognizerState {
 /// in the gesture arena, the gesture will be rejected.
 abstract class PrimaryPointerGestureRecognizer extends OneSequenceGestureRecognizer {
   /// Initializes the [deadline] field during construction of subclasses.
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
   PrimaryPointerGestureRecognizer({
     this.deadline,
     this.preAcceptSlopTolerance = kTouchSlop,
     this.postAcceptSlopTolerance = kTouchSlop,
     Object debugOwner,
+    PointerDeviceKind kind,
   }) : assert(
          preAcceptSlopTolerance == null || preAcceptSlopTolerance >= 0,
          'The preAcceptSlopTolerance must be positive or null',
@@ -304,7 +363,7 @@ abstract class PrimaryPointerGestureRecognizer extends OneSequenceGestureRecogni
          postAcceptSlopTolerance == null || postAcceptSlopTolerance >= 0,
          'The postAcceptSlopTolerance must be positive or null',
        ),
-       super(debugOwner: debugOwner);
+       super(debugOwner: debugOwner, kind: kind);
 
   /// If non-null, the recognizer will call [didExceedDeadline] after this
   /// amount of time has elapsed since starting to track the primary pointer.
@@ -346,7 +405,7 @@ abstract class PrimaryPointerGestureRecognizer extends OneSequenceGestureRecogni
   Timer _timer;
 
   @override
-  void addPointer(PointerDownEvent event) {
+  void addAllowedPointer(PointerDownEvent event) {
     startTrackingPointer(event.pointer);
     if (state == GestureRecognizerState.ready) {
       state = GestureRecognizerState.possible;

packages/flutter/lib/src/gestures/scale.dart

@@ -183,7 +183,12 @@ class _LineBetweenPointers{
 /// are no longer in contact with the screen, the recognizer calls [onEnd].
 class ScaleGestureRecognizer extends OneSequenceGestureRecognizer {
   /// Create a gesture recognizer for interactions intended for scaling content.
-  ScaleGestureRecognizer({ Object debugOwner }) : super(debugOwner: debugOwner);
+  ///
+  /// {@macro flutter.gestures.gestureRecognizer.kind}
+  ScaleGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+  }) : super(debugOwner: debugOwner, kind: kind);
 
   /// The pointers in contact with the screen have established a focal point and
   /// initial scale of 1.0.
@@ -239,7 +244,7 @@ class ScaleGestureRecognizer extends OneSequenceGestureRecognizer {
   }
 
   @override
-  void addPointer(PointerEvent event) {
+  void addAllowedPointer(PointerEvent event) {
     startTrackingPointer(event.pointer);
     _velocityTrackers[event.pointer] = VelocityTracker();
     if (_state == _ScaleState.ready) {

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

@@ -599,12 +599,12 @@ class _TextFieldState extends State<TextField> with AutomaticKeepAliveClientMixi
     }
   }
 
-  InteractiveInkFeature _createInkFeature(TapDownDetails details) {
+  InteractiveInkFeature _createInkFeature(Offset globalPosition) {
     final MaterialInkController inkController = Material.of(context);
     final ThemeData themeData = Theme.of(context);
     final BuildContext editableContext = _editableTextKey.currentContext;
     final RenderBox referenceBox = InputDecorator.containerOf(editableContext) ?? editableContext.findRenderObject();
-    final Offset position = referenceBox.globalToLocal(details.globalPosition);
+    final Offset position = referenceBox.globalToLocal(globalPosition);
     final Color color = themeData.splashColor;
 
     InteractiveInkFeature splash;
@@ -637,7 +637,7 @@ class _TextFieldState extends State<TextField> with AutomaticKeepAliveClientMixi
 
   void _handleTapDown(TapDownDetails details) {
     _renderEditable.handleTapDown(details);
-    _startSplash(details);
+    _startSplash(details.globalPosition);
   }
 
   void _handleForcePressStarted(ForcePressDetails details) {
@@ -723,10 +723,29 @@ class _TextFieldState extends State<TextField> with AutomaticKeepAliveClientMixi
     }
   }
 
-  void _startSplash(TapDownDetails details) {
+  void _handleDragSelectionStart(DragStartDetails details) {
+    _renderEditable.selectPositionAt(
+      from: details.globalPosition,
+      cause: SelectionChangedCause.drag,
+    );
+    _startSplash(details.globalPosition);
+  }
+
+  void _handleDragSelectionUpdate(
+      DragStartDetails startDetails,
+      DragUpdateDetails updateDetails,
+  ) {
+    _renderEditable.selectPositionAt(
+      from: startDetails.globalPosition,
+      to: updateDetails.globalPosition,
+      cause: SelectionChangedCause.drag,
+    );
+  }
+
+  void _startSplash(Offset globalPosition) {
     if (_effectiveFocusNode.hasFocus)
       return;
-    final InteractiveInkFeature splash = _createInkFeature(details);
+    final InteractiveInkFeature splash = _createInkFeature(globalPosition);
     _splashes ??= HashSet<InteractiveInkFeature>();
     _splashes.add(splash);
     _currentSplash = splash;
@@ -888,6 +907,8 @@ class _TextFieldState extends State<TextField> with AutomaticKeepAliveClientMixi
           onSingleLongTapMoveUpdate: _handleSingleLongTapMoveUpdate,
           onSingleLongTapEnd: _handleSingleLongTapEnd,
           onDoubleTapDown: _handleDoubleTapDown,
+          onDragSelectionStart: _handleDragSelectionStart,
+          onDragSelectionUpdate: _handleDragSelectionUpdate,
           behavior: HitTestBehavior.translucent,
           child: child,
         ),

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

@@ -55,6 +55,10 @@ enum SelectionChangedCause {
   /// Keyboard-triggered selection changes may be caused by the IME as well as
   /// by accessibility tools (e.g. TalkBack on Android).
   keyboard,
+
+  /// The user used the mouse to change the selection by dragging over a piece
+  /// of text.
+  drag,
 }
 
 /// Signature for the callback that reports when the caret location changes.
@@ -1235,7 +1239,7 @@ class RenderEditable extends RenderBox {
   }
 
   /// If [ignorePointer] is false (the default) then this method is called by
-  /// the internal gesture recognizer's [LongPressRecognizer.onLongPress]
+  /// the internal gesture recognizer's [LongPressGestureRecognizer.onLongPress]
   /// callback.
   ///
   /// When [ignorePointer] is true, an ancestor widget must respond to long

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

@@ -367,7 +367,9 @@ class RenderUiKitView extends RenderBox {
 // When the team wins a gesture the recognizer notifies the engine that it should release
 // the touch sequence to the embedded UIView.
 class _UiKitViewGestureRecognizer extends OneSequenceGestureRecognizer {
-  _UiKitViewGestureRecognizer(this.controller, this.gestureRecognizerFactories) {
+  _UiKitViewGestureRecognizer(this.controller, this.gestureRecognizerFactories, {
+    PointerDeviceKind kind,
+  }): super(kind: kind) {
     team = GestureArenaTeam();
     team.captain = this;
     _gestureRecognizers = gestureRecognizerFactories.map(
@@ -387,7 +389,7 @@ class _UiKitViewGestureRecognizer extends OneSequenceGestureRecognizer {
   final UiKitViewController controller;
 
   @override
-  void addPointer(PointerDownEvent event) {
+  void addAllowedPointer(PointerDownEvent event) {
     startTrackingPointer(event.pointer);
     for (OneSequenceGestureRecognizer recognizer in _gestureRecognizers) {
       recognizer.addPointer(event);
@@ -427,7 +429,9 @@ class _UiKitViewGestureRecognizer extends OneSequenceGestureRecognizer {
 // When the team wins the recognizer sends all the cached point events to the embedded Android view, and
 // sets itself to a "forwarding mode" where it will forward any new pointer event to the Android view.
 class _AndroidViewGestureRecognizer extends OneSequenceGestureRecognizer {
-  _AndroidViewGestureRecognizer(this.dispatcher, this.gestureRecognizerFactories) {
+  _AndroidViewGestureRecognizer(this.dispatcher, this.gestureRecognizerFactories, {
+    PointerDeviceKind kind,
+  }): super(kind: kind) {
     team = GestureArenaTeam();
     team.captain = this;
     _gestureRecognizers = gestureRecognizerFactories.map(
@@ -456,7 +460,7 @@ class _AndroidViewGestureRecognizer extends OneSequenceGestureRecognizer {
   Set<OneSequenceGestureRecognizer> _gestureRecognizers;
 
   @override
-  void addPointer(PointerDownEvent event) {
+  void addAllowedPointer(PointerDownEvent event) {
     startTrackingPointer(event.pointer);
     for (OneSequenceGestureRecognizer recognizer in _gestureRecognizers) {
       recognizer.addPointer(event);

packages/flutter/lib/src/widgets/text_selection.dart

@@ -8,7 +8,7 @@ import 'package:flutter/gestures.dart' show kDoubleTapTimeout, kDoubleTapSlop;
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/scheduler.dart';
-import 'package:flutter/gestures.dart' show DragStartBehavior;
+import 'package:flutter/gestures.dart';
 
 import 'basic.dart';
 import 'container.dart';
@@ -20,6 +20,10 @@ import 'transitions.dart';
 
 export 'package:flutter/services.dart' show TextSelectionDelegate;
 
+/// A duration that controls how often the drag selection update callback is
+/// called.
+const Duration _kDragSelectionUpdateThrottle = Duration(milliseconds: 50);
+
 /// Which type of selection handle to be displayed.
 ///
 /// With mixed-direction text, both handles may be the same type. Examples:
@@ -64,6 +68,19 @@ enum _TextSelectionHandlePosition { start, end }
 /// Used by [TextSelectionOverlay.onSelectionOverlayChanged].
 typedef TextSelectionOverlayChanged = void Function(TextEditingValue value, Rect caretRect);
 
+/// Signature for when a pointer that's dragging to select text has moved again.
+///
+/// The first argument [startDetails] contains the details of the event that
+/// initiated the dragging.
+///
+/// The second argument [updateDetails] contains the details of the current
+/// pointer movement. It's the same as the one passed to [DragGestureRecognizer.onUpdate].
+///
+/// This signature is different from [GestureDragUpdateCallback] to make it
+/// easier for various text fields to use [TextSelectionGestureDetector] without
+/// having to store the start position.
+typedef DragSelectionUpdateCallback = void Function(DragStartDetails startDetails, DragUpdateDetails updateDetails);
+
 /// An interface for building the selection UI, to be provided by the
 /// implementor of the toolbar widget.
 ///
@@ -620,6 +637,9 @@ class TextSelectionGestureDetector extends StatefulWidget {
     this.onSingleLongTapMoveUpdate,
     this.onSingleLongTapEnd,
     this.onDoubleTapDown,
+    this.onDragSelectionStart,
+    this.onDragSelectionUpdate,
+    this.onDragSelectionEnd,
     this.behavior,
     @required this.child,
   }) : assert(child != null),
@@ -664,6 +684,19 @@ class TextSelectionGestureDetector extends StatefulWidget {
   /// time (within [kDoubleTapTimeout]) to a previous short tap.
   final GestureTapDownCallback onDoubleTapDown;
 
+  /// Called when a mouse starts dragging to select text.
+  final GestureDragStartCallback onDragSelectionStart;
+
+  /// Called repeatedly as a mouse moves while dragging.
+  ///
+  /// The frequency of calls is throttled to avoid excessive text layout
+  /// operations in text fields. The throttling is controlled by the constant
+  /// [_kDragSelectionUpdateThrottle].
+  final DragSelectionUpdateCallback onDragSelectionUpdate;
+
+  /// Called when a mouse that was previously dragging is released.
+  final GestureDragEndCallback onDragSelectionEnd;
+
   /// How this gesture detector should behave during hit testing.
   ///
   /// This defaults to [HitTestBehavior.deferToChild].
@@ -687,6 +720,7 @@ class _TextSelectionGestureDetectorState extends State<TextSelectionGestureDetec
   @override
   void dispose() {
     _doubleTapTimer?.cancel();
+    _dragUpdateThrottleTimer?.cancel();
     super.dispose();
   }
 
@@ -730,6 +764,56 @@ class _TextSelectionGestureDetectorState extends State<TextSelectionGestureDetec
     }
   }
 
+  DragStartDetails _lastDragStartDetails;
+  DragUpdateDetails _lastDragUpdateDetails;
+  Timer _dragUpdateThrottleTimer;
+
+  void _handleDragStart(DragStartDetails details) {
+    assert(_lastDragStartDetails == null);
+    _lastDragStartDetails = details;
+    if (widget.onDragSelectionStart != null) {
+      widget.onDragSelectionStart(details);
+    }
+  }
+
+  void _handleDragUpdate(DragUpdateDetails details) {
+    _lastDragUpdateDetails = details;
+    // Only schedule a new timer if there's no one pending.
+    _dragUpdateThrottleTimer ??= Timer(_kDragSelectionUpdateThrottle, _handleDragUpdateThrottled);
+  }
+
+  /// Drag updates are being throttled to avoid excessive text layouts in text
+  /// fields. The frequency of invocations is controlled by the constant
+  /// [_kDragSelectionUpdateThrottle].
+  ///
+  /// Once the drag gesture ends, any pending drag update will be fired
+  /// immediately. See [_handleDragEnd].
+  void _handleDragUpdateThrottled() {
+    assert(_lastDragStartDetails != null);
+    assert(_lastDragUpdateDetails != null);
+    if (widget.onDragSelectionUpdate != null) {
+      widget.onDragSelectionUpdate(_lastDragStartDetails, _lastDragUpdateDetails);
+    }
+    _dragUpdateThrottleTimer = null;
+    _lastDragUpdateDetails = null;
+  }
+
+  void _handleDragEnd(DragEndDetails details) {
+    assert(_lastDragStartDetails != null);
+    if (_dragUpdateThrottleTimer != null) {
+      // If there's already an update scheduled, trigger it immediately and
+      // cancel the timer.
+      _dragUpdateThrottleTimer.cancel();
+      _handleDragUpdateThrottled();
+    }
+    if (widget.onDragSelectionEnd != null) {
+      widget.onDragSelectionEnd(details);
+    }
+    _dragUpdateThrottleTimer = null;
+    _lastDragStartDetails = null;
+    _lastDragUpdateDetails = null;
+  }
+
   void _forcePressStarted(ForcePressDetails details) {
     _doubleTapTimer?.cancel();
     _doubleTapTimer = null;
@@ -754,7 +838,7 @@ class _TextSelectionGestureDetectorState extends State<TextSelectionGestureDetec
     }
   }
 
-  void _handleLongPressUp(LongPressEndDetails details) {
+  void _handleLongPressEnd(LongPressEndDetails details) {
     if (!_isDoubleTap && widget.onSingleLongTapEnd != null) {
       widget.onSingleLongTapEnd(details);
     }
@@ -778,15 +862,64 @@ class _TextSelectionGestureDetectorState extends State<TextSelectionGestureDetec
 
   @override
   Widget build(BuildContext context) {
-    return GestureDetector(
+    final Map<Type, GestureRecognizerFactory> gestures = <Type, GestureRecognizerFactory>{};
-      onTapDown: _handleTapDown,
+
-      onTapUp: _handleTapUp,
+    gestures[TapGestureRecognizer] = GestureRecognizerFactoryWithHandlers<TapGestureRecognizer>(
-      onForcePressStart: widget.onForcePressStart != null ? _forcePressStarted : null,
+          () => TapGestureRecognizer(debugOwner: this),
-      onForcePressEnd: widget.onForcePressEnd != null ? _forcePressEnded : null,
+          (TapGestureRecognizer instance) {
-      onTapCancel: _handleTapCancel,
+        instance
-      onLongPressStart: _handleLongPressStart,
+          ..onTapDown = _handleTapDown
-      onLongPressMoveUpdate: _handleLongPressMoveUpdate,
+          ..onTapUp = _handleTapUp
-      onLongPressEnd: _handleLongPressUp,
+          ..onTapCancel = _handleTapCancel;
+      },
+    );
+
+    if (widget.onSingleLongTapStart != null ||
+        widget.onSingleLongTapMoveUpdate != null ||
+        widget.onSingleLongTapEnd != null) {
+      gestures[LongPressGestureRecognizer] = GestureRecognizerFactoryWithHandlers<LongPressGestureRecognizer>(
+            () => LongPressGestureRecognizer(debugOwner: this, kind: PointerDeviceKind.touch),
+            (LongPressGestureRecognizer instance) {
+          instance
+            ..onLongPressStart = _handleLongPressStart
+            ..onLongPressMoveUpdate = _handleLongPressMoveUpdate
+            ..onLongPressEnd = _handleLongPressEnd;
+        },
+      );
+    }
+
+    if (widget.onDragSelectionStart != null ||
+        widget.onDragSelectionUpdate != null ||
+        widget.onDragSelectionEnd != null) {
+      // TODO(mdebbar): Support dragging in any direction (for multiline text).
+      // https://github.com/flutter/flutter/issues/28676
+      gestures[HorizontalDragGestureRecognizer] = GestureRecognizerFactoryWithHandlers<HorizontalDragGestureRecognizer>(
+            () => HorizontalDragGestureRecognizer(debugOwner: this, kind: PointerDeviceKind.mouse),
+            (HorizontalDragGestureRecognizer instance) {
+          instance
+            // Text selection should start from the position of the first pointer
+            // down event.
+            ..dragStartBehavior = DragStartBehavior.down
+            ..onStart = _handleDragStart
+            ..onUpdate = _handleDragUpdate
+            ..onEnd = _handleDragEnd;
+        },
+      );
+    }
+
+    if (widget.onForcePressStart != null || widget.onForcePressEnd != null) {
+      gestures[ForcePressGestureRecognizer] = GestureRecognizerFactoryWithHandlers<ForcePressGestureRecognizer>(
+            () => ForcePressGestureRecognizer(debugOwner: this),
+            (ForcePressGestureRecognizer instance) {
+          instance
+            ..onStart = widget.onForcePressStart != null ? _forcePressStarted : null
+            ..onEnd = widget.onForcePressEnd != null ? _forcePressEnded : null;
+        },
+      );
+    }
+
+    return RawGestureDetector(
+      gestures: gestures,
       excludeFromSemantics: true,
       behavior: widget.behavior,
       child: widget.child,

packages/flutter/test/gestures/drag_test.dart

@@ -517,4 +517,83 @@ void main() {
     tester.route(pointer.up());
     drag.dispose();
   });
+
+  testGesture('Can filter drags based on device kind', (GestureTester tester) {
+    final HorizontalDragGestureRecognizer drag =
+        HorizontalDragGestureRecognizer(
+            kind: PointerDeviceKind.mouse,
+        )
+        ..dragStartBehavior = DragStartBehavior.down;
+
+    bool didStartDrag = false;
+    drag.onStart = (_) {
+      didStartDrag = true;
+    };
+
+    double updatedDelta;
+    drag.onUpdate = (DragUpdateDetails details) {
+      updatedDelta = details.primaryDelta;
+    };
+
+    bool didEndDrag = false;
+    drag.onEnd = (DragEndDetails details) {
+      didEndDrag = true;
+    };
+
+    // Using a touch pointer to drag shouldn't be recognized.
+    final TestPointer touchPointer = TestPointer(5, PointerDeviceKind.touch);
+    final PointerDownEvent touchDown = touchPointer.down(const Offset(10.0, 10.0));
+    drag.addPointer(touchDown);
+    tester.closeArena(5);
+    expect(didStartDrag, isFalse);
+    expect(updatedDelta, isNull);
+    expect(didEndDrag, isFalse);
+
+    tester.route(touchDown);
+    // Still doesn't recognize the drag because it's coming from a touch pointer.
+    expect(didStartDrag, isFalse);
+    expect(updatedDelta, isNull);
+    expect(didEndDrag, isFalse);
+
+    tester.route(touchPointer.move(const Offset(20.0, 25.0)));
+    // Still doesn't recognize the drag because it's coming from a touch pointer.
+    expect(didStartDrag, isFalse);
+    expect(updatedDelta, isNull);
+    expect(didEndDrag, isFalse);
+
+    tester.route(touchPointer.up());
+    // Still doesn't recognize the drag because it's coming from a touch pointer.
+    expect(didStartDrag, isFalse);
+    expect(updatedDelta, isNull);
+    expect(didEndDrag, isFalse);
+
+    // Using a mouse pointer to drag should be recognized.
+    final TestPointer mousePointer = TestPointer(5, PointerDeviceKind.mouse);
+    final PointerDownEvent mouseDown = mousePointer.down(const Offset(10.0, 10.0));
+    drag.addPointer(mouseDown);
+    tester.closeArena(5);
+    expect(didStartDrag, isFalse);
+    expect(updatedDelta, isNull);
+    expect(didEndDrag, isFalse);
+
+    tester.route(mouseDown);
+    expect(didStartDrag, isTrue);
+    didStartDrag = false;
+    expect(updatedDelta, isNull);
+    expect(didEndDrag, isFalse);
+
+    tester.route(mousePointer.move(const Offset(20.0, 25.0)));
+    expect(didStartDrag, isFalse);
+    expect(updatedDelta, 10.0);
+    updatedDelta = null;
+    expect(didEndDrag, isFalse);
+
+    tester.route(mousePointer.up());
+    expect(didStartDrag, isFalse);
+    expect(updatedDelta, isNull);
+    expect(didEndDrag, isTrue);
+    didEndDrag = false;
+
+    drag.dispose();
+  });
 }

packages/flutter/test/gestures/long_press_test.dart

@@ -278,4 +278,44 @@ void main() {
       longPressDrag.dispose();
     });
   });
+
+  testGesture('Can filter long press based on device kind', (GestureTester tester) {
+    final LongPressGestureRecognizer mouseLongPress = LongPressGestureRecognizer(kind: PointerDeviceKind.mouse);
+
+    bool mouseLongPressDown = false;
+    mouseLongPress.onLongPress = () {
+      mouseLongPressDown = true;
+    };
+
+    const PointerDownEvent mouseDown = PointerDownEvent(
+      pointer: 5,
+      position: Offset(10, 10),
+      kind: PointerDeviceKind.mouse,
+    );
+    const PointerDownEvent touchDown = PointerDownEvent(
+      pointer: 5,
+      position: Offset(10, 10),
+      kind: PointerDeviceKind.touch,
+    );
+
+    // Touch events shouldn't be recognized.
+    mouseLongPress.addPointer(touchDown);
+    tester.closeArena(5);
+    expect(mouseLongPressDown, isFalse);
+    tester.route(touchDown);
+    expect(mouseLongPressDown, isFalse);
+    tester.async.elapse(const Duration(seconds: 2));
+    expect(mouseLongPressDown, isFalse);
+
+    // Mouse events are still recognized.
+    mouseLongPress.addPointer(mouseDown);
+    tester.closeArena(5);
+    expect(mouseLongPressDown, isFalse);
+    tester.route(mouseDown);
+    expect(mouseLongPressDown, isFalse);
+    tester.async.elapse(const Duration(seconds: 2));
+    expect(mouseLongPressDown, isTrue);
+
+    mouseLongPress.dispose();
+  });
 }

packages/flutter/test/gestures/multidrag_test.dart

@@ -61,4 +61,32 @@ void main() {
     expect(didStartDrag, isTrue);
     drag.dispose();
   });
+
+  testGesture('MultiDrag: can filter based on device kind', (GestureTester tester) {
+    final DelayedMultiDragGestureRecognizer drag =
+        DelayedMultiDragGestureRecognizer(kind: PointerDeviceKind.touch);
+
+    bool didStartDrag = false;
+    drag.onStart = (Offset position) {
+      didStartDrag = true;
+      return TestDrag();
+    };
+
+    final TestPointer mousePointer = TestPointer(5, PointerDeviceKind.mouse);
+    final PointerDownEvent down = mousePointer.down(const Offset(10.0, 10.0));
+    drag.addPointer(down);
+    tester.closeArena(5);
+    expect(didStartDrag, isFalse);
+    tester.async.flushMicrotasks();
+    expect(didStartDrag, isFalse);
+    tester.route(mousePointer.move(const Offset(20.0, 20.0))); // move less than touch slop before delay expires
+    expect(didStartDrag, isFalse);
+    tester.async.elapse(kLongPressTimeout * 2); // expire delay
+    // Still false because it shouldn't recognize mouse events.
+    expect(didStartDrag, isFalse);
+    tester.route(mousePointer.move(const Offset(30.0, 70.0))); // move more than touch slop after delay expires
+    // And still false.
+    expect(didStartDrag, isFalse);
+    drag.dispose();
+  });
 }

packages/flutter/test/gestures/multitap_test.dart

@@ -69,4 +69,81 @@ void main() {
 
     tap.dispose();
   });
+
+  testGesture('Can filter based on device kind', (GestureTester tester) {
+    final MultiTapGestureRecognizer tap =
+        MultiTapGestureRecognizer(
+          longTapDelay: kLongPressTimeout,
+          kind: PointerDeviceKind.touch,
+        );
+
+    final List<String> log = <String>[];
+
+    tap.onTapDown = (int pointer, TapDownDetails details) { log.add('tap-down $pointer'); };
+    tap.onTapUp = (int pointer, TapUpDetails details) { log.add('tap-up $pointer'); };
+    tap.onTap = (int pointer) { log.add('tap $pointer'); };
+    tap.onLongTapDown = (int pointer, TapDownDetails details) { log.add('long-tap-down $pointer'); };
+    tap.onTapCancel = (int pointer) { log.add('tap-cancel $pointer'); };
+
+
+    final TestPointer touchPointer5 = TestPointer(5, PointerDeviceKind.touch);
+    final PointerDownEvent down5 = touchPointer5.down(const Offset(10.0, 10.0));
+    tap.addPointer(down5);
+    tester.closeArena(5);
+    expect(log, <String>['tap-down 5']);
+    log.clear();
+    tester.route(down5);
+    expect(log, isEmpty);
+
+    final TestPointer mousePointer6 = TestPointer(6, PointerDeviceKind.mouse);
+    final PointerDownEvent down6 = mousePointer6.down(const Offset(20.0, 20.0));
+    tap.addPointer(down6);
+    tester.closeArena(6);
+    // Mouse down should be ignored by the recognizer.
+    expect(log, isEmpty);
+
+    final TestPointer touchPointer7 = TestPointer(7, PointerDeviceKind.touch);
+    final PointerDownEvent down7 = touchPointer7.down(const Offset(15.0, 15.0));
+    tap.addPointer(down7);
+    tester.closeArena(7);
+    expect(log, <String>['tap-down 7']);
+    log.clear();
+    tester.route(down7);
+    expect(log, isEmpty);
+
+    tester.route(touchPointer5.move(const Offset(11.0, 12.0)));
+    expect(log, isEmpty);
+
+    // Move within the [kTouchSlop] range.
+    tester.route(mousePointer6.move(const Offset(21.0, 18.0)));
+    // Move beyond the slop range.
+    tester.route(mousePointer6.move(const Offset(50.0, 40.0)));
+    // Neither triggers any event because they originate from a mouse.
+    expect(log, isEmpty);
+
+    tester.route(touchPointer7.move(const Offset(14.0, 13.0)));
+    expect(log, isEmpty);
+
+    tester.route(touchPointer5.up());
+    expect(log, <String>[
+      'tap-up 5',
+      'tap 5',
+    ]);
+    log.clear();
+
+    // Mouse up should be ignored.
+    tester.route(mousePointer6.up());
+    expect(log, isEmpty);
+
+    tester.async.elapse(kLongPressTimeout + kPressTimeout);
+    // Only the touch pointer (7) triggers a long-tap, not the mouse pointer (6).
+    expect(log, <String>['long-tap-down 7']);
+    log.clear();
+
+    tester.route(touchPointer7.move(const Offset(40.0, 30.0))); // move more than kTouchSlop from 15.0,15.0
+    expect(log, <String>['tap-cancel 7']);
+    log.clear();
+
+    tap.dispose();
+  });
 }

packages/flutter/test/gestures/scale_test.dart

@@ -220,6 +220,101 @@ void main() {
     tap.dispose();
   });
 
+  testGesture('Rejects scale gestures from unallowed device kinds', (GestureTester tester) {
+    final ScaleGestureRecognizer scale = ScaleGestureRecognizer(kind: PointerDeviceKind.touch);
+
+    bool didStartScale = false;
+    scale.onStart = (ScaleStartDetails details) {
+      didStartScale = true;
+    };
+
+    double updatedScale;
+    scale.onUpdate = (ScaleUpdateDetails details) {
+      updatedScale = details.scale;
+    };
+
+    final TestPointer mousePointer = TestPointer(1, PointerDeviceKind.mouse);
+
+    final PointerDownEvent down = mousePointer.down(const Offset(0.0, 0.0));
+    scale.addPointer(down);
+    tester.closeArena(1);
+
+    // One-finger panning
+    tester.route(down);
+    expect(didStartScale, isFalse);
+    expect(updatedScale, isNull);
+
+    // Using a mouse, the scale gesture shouldn't even start.
+    tester.route(mousePointer.move(const Offset(20.0, 30.0)));
+    expect(didStartScale, isFalse);
+    expect(updatedScale, isNull);
+
+    scale.dispose();
+  });
+
+  testGesture('Scale gestures starting from allowed device kinds cannot be ended from unallowed devices', (GestureTester tester) {
+    final ScaleGestureRecognizer scale = ScaleGestureRecognizer(kind: PointerDeviceKind.touch);
+
+    bool didStartScale = false;
+    Offset updatedFocalPoint;
+    scale.onStart = (ScaleStartDetails details) {
+      didStartScale = true;
+      updatedFocalPoint = details.focalPoint;
+    };
+
+    double updatedScale;
+    scale.onUpdate = (ScaleUpdateDetails details) {
+      updatedScale = details.scale;
+      updatedFocalPoint = details.focalPoint;
+    };
+
+    bool didEndScale = false;
+    scale.onEnd = (ScaleEndDetails details) {
+      didEndScale = true;
+    };
+
+    final TestPointer touchPointer = TestPointer(1, PointerDeviceKind.touch);
+
+    final PointerDownEvent down = touchPointer.down(const Offset(0.0, 0.0));
+    scale.addPointer(down);
+    tester.closeArena(1);
+
+    // One-finger panning
+    tester.route(down);
+    expect(didStartScale, isTrue);
+    didStartScale = false;
+    expect(updatedScale, isNull);
+    expect(updatedFocalPoint, const Offset(0.0, 0.0));
+    expect(didEndScale, isFalse);
+
+    // The gesture can start using one touch finger.
+    tester.route(touchPointer.move(const Offset(20.0, 30.0)));
+    expect(updatedFocalPoint, const Offset(20.0, 30.0));
+    updatedFocalPoint = null;
+    expect(updatedScale, 1.0);
+    updatedScale = null;
+    expect(didEndScale, isFalse);
+
+    // Two-finger scaling
+    final TestPointer mousePointer = TestPointer(2, PointerDeviceKind.mouse);
+    final PointerDownEvent down2 = mousePointer.down(const Offset(10.0, 20.0));
+    scale.addPointer(down2);
+    tester.closeArena(2);
+    tester.route(down2);
+
+    // Mouse-generated events are ignored.
+    expect(didEndScale, isFalse);
+    expect(updatedScale, isNull);
+    expect(didStartScale, isFalse);
+
+    // Zoom in using a mouse doesn't work either.
+    tester.route(mousePointer.move(const Offset(0.0, 10.0)));
+    expect(updatedScale, isNull);
+    expect(didEndScale, isFalse);
+
+    scale.dispose();
+  });
+
   testGesture('Scale gesture competes with drag', (GestureTester tester) {
     final ScaleGestureRecognizer scale = ScaleGestureRecognizer();
     final HorizontalDragGestureRecognizer drag = HorizontalDragGestureRecognizer();

packages/flutter/test/material/text_field_test.dart

@@ -12,7 +12,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/gestures.dart' show DragStartBehavior;
+import 'package:flutter/gestures.dart' show DragStartBehavior, PointerDeviceKind;
 
 import '../widgets/semantics_tester.dart';
 import 'feedback_tester.dart';
@@ -533,6 +533,37 @@ void main() {
     expect(controller.selection.extentOffset, testValue.indexOf('f')+1);
   });
 
+  testWidgets('Mouse long press is just like a tap', (WidgetTester tester) async {
+    final TextEditingController controller = TextEditingController();
+
+    await tester.pumpWidget(
+      overlay(
+        child: TextField(
+          controller: controller,
+        ),
+      )
+    );
+
+    const String testValue = 'abc def ghi';
+    await tester.enterText(find.byType(TextField), testValue);
+    expect(controller.value.text, testValue);
+    await skipPastScrollingAnimation(tester);
+
+    expect(controller.selection.isCollapsed, true);
+
+    // Long press the 'e' using a mouse device.
+    final int eIndex = testValue.indexOf('e');
+    final Offset ePos = textOffsetToPosition(tester, eIndex);
+    final TestGesture gesture = await tester.startGesture(ePos, kind: PointerDeviceKind.mouse);
+    await tester.pump(const Duration(seconds: 2));
+    await gesture.up();
+    await tester.pump();
+
+    // The cursor is placed just like a regular tap.
+    expect(controller.selection.baseOffset, eIndex);
+    expect(controller.selection.extentOffset, eIndex);
+  });
+
   testWidgets('enableInteractiveSelection = false, long-press', (WidgetTester tester) async {
     final TextEditingController controller = TextEditingController();
 
@@ -564,6 +595,69 @@ void main() {
     expect(controller.selection.extentOffset, -1);
   });
 
+  testWidgets('Can select text by dragging with a mouse', (WidgetTester tester) async {
+    final TextEditingController controller = TextEditingController();
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: TextField(
+            dragStartBehavior: DragStartBehavior.down,
+            controller: controller,
+          ),
+        ),
+      ),
+    );
+
+    const String testValue = 'abc def ghi';
+    await tester.enterText(find.byType(TextField), testValue);
+    await skipPastScrollingAnimation(tester);
+
+    final Offset ePos = textOffsetToPosition(tester, testValue.indexOf('e'));
+    final Offset gPos = textOffsetToPosition(tester, testValue.indexOf('g'));
+
+    final TestGesture gesture = await tester.startGesture(ePos, kind: PointerDeviceKind.mouse);
+    await tester.pump();
+    await gesture.moveTo(gPos);
+    await tester.pump();
+    await gesture.up();
+    await tester.pumpAndSettle();
+
+    expect(controller.selection.baseOffset, testValue.indexOf('e'));
+    expect(controller.selection.extentOffset, testValue.indexOf('g'));
+  });
+
+  testWidgets('Slow mouse dragging also selects text', (WidgetTester tester) async {
+    final TextEditingController controller = TextEditingController();
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: TextField(
+            dragStartBehavior: DragStartBehavior.down,
+            controller: controller,
+          ),
+        ),
+      ),
+    );
+
+    const String testValue = 'abc def ghi';
+    await tester.enterText(find.byType(TextField), testValue);
+    await skipPastScrollingAnimation(tester);
+
+    final Offset ePos = textOffsetToPosition(tester, testValue.indexOf('e'));
+    final Offset gPos = textOffsetToPosition(tester, testValue.indexOf('g'));
+
+    final TestGesture gesture = await tester.startGesture(ePos, kind: PointerDeviceKind.mouse);
+    await tester.pump(const Duration(seconds: 2));
+    await gesture.moveTo(gPos);
+    await tester.pump();
+    await gesture.up();
+
+    expect(controller.selection.baseOffset, testValue.indexOf('e'));
+    expect(controller.selection.extentOffset, testValue.indexOf('g'));
+  });
+
   testWidgets('Can drag handles to change selection', (WidgetTester tester) async {
     final TextEditingController controller = TextEditingController();
 

packages/flutter/test/widgets/text_selection_test.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter/gestures.dart' show PointerDeviceKind;
 import 'package:flutter/widgets.dart';
 
 void main() {
@@ -13,9 +14,11 @@ void main() {
   int doubleTapDownCount;
   int forcePressStartCount;
   int forcePressEndCount;
+  int dragStartCount;
+  int dragUpdateCount;
+  int dragEndCount;
   const Offset forcePressOffset = Offset(400.0, 50.0);
 
-
   void _handleTapDown(TapDownDetails details) { tapCount++; }
   void _handleSingleTapUp(TapUpDetails details) { singleTapUpCount++; }
   void _handleSingleTapCancel() { singleTapCancelCount++; }
@@ -23,6 +26,9 @@ void main() {
   void _handleDoubleTapDown(TapDownDetails details) { doubleTapDownCount++; }
   void _handleForcePressStart(ForcePressDetails details) { forcePressStartCount++; }
   void _handleForcePressEnd(ForcePressDetails details) { forcePressEndCount++; }
+  void _handleDragSelectionStart(DragStartDetails details) { dragStartCount++; }
+  void _handleDragSelectionUpdate(DragStartDetails _, DragUpdateDetails details) { dragUpdateCount++; }
+  void _handleDragSelectionEnd(DragEndDetails details) { dragEndCount++; }
 
   setUp(() {
     tapCount = 0;
@@ -32,6 +38,9 @@ void main() {
     doubleTapDownCount = 0;
     forcePressStartCount = 0;
     forcePressEndCount = 0;
+    dragStartCount = 0;
+    dragUpdateCount = 0;
+    dragEndCount = 0;
   });
 
   Future<void> pumpGestureDetector(WidgetTester tester) async {
@@ -45,6 +54,9 @@ void main() {
         onDoubleTapDown: _handleDoubleTapDown,
         onForcePressStart: _handleForcePressStart,
         onForcePressEnd: _handleForcePressEnd,
+        onDragSelectionStart: _handleDragSelectionStart,
+        onDragSelectionUpdate: _handleDragSelectionUpdate,
+        onDragSelectionEnd: _handleDragSelectionEnd,
         child: Container(),
       ),
     );
@@ -275,4 +287,89 @@ void main() {
     expect(forcePressEndCount, 1);
     expect(doubleTapDownCount, 0);
   });
+
+  testWidgets('a long press from a touch device is recognized as a long single tap', (WidgetTester tester) async {
+    await pumpGestureDetector(tester);
+
+    const int pointerValue = 1;
+    final TestGesture gesture =
+        await tester.startGesture(const Offset(200.0, 200.0), pointer: pointerValue, kind: PointerDeviceKind.touch);
+    await tester.pump(const Duration(seconds: 2));
+    await gesture.up();
+    await tester.pumpAndSettle();
+
+    expect(tapCount, 1);
+    expect(singleTapUpCount, 0);
+    expect(singleLongTapStartCount, 1);
+  });
+
+  testWidgets('a long press from a mouse is just a tap', (WidgetTester tester) async {
+    await pumpGestureDetector(tester);
+
+    const int pointerValue = 1;
+    final TestGesture gesture =
+        await tester.startGesture(const Offset(200.0, 200.0), pointer: pointerValue, kind: PointerDeviceKind.mouse);
+    await tester.pump(const Duration(seconds: 2));
+    await gesture.up();
+    await tester.pumpAndSettle();
+
+    expect(tapCount, 1);
+    expect(singleTapUpCount, 1);
+    expect(singleLongTapStartCount, 0);
+  });
+
+  testWidgets('a touch drag is not recognized for text selection', (WidgetTester tester) async {
+    await pumpGestureDetector(tester);
+
+    const int pointerValue = 1;
+    final TestGesture gesture =
+        await tester.startGesture(const Offset(200.0, 200.0), pointer: pointerValue, kind: PointerDeviceKind.touch);
+    await tester.pump();
+    await gesture.moveBy(const Offset(210.0, 200.0));
+    await tester.pump();
+    await gesture.up();
+    await tester.pumpAndSettle();
+
+    expect(tapCount, 0);
+    expect(singleTapUpCount, 0);
+    expect(dragStartCount, 0);
+    expect(dragUpdateCount, 0);
+    expect(dragEndCount, 0);
+  });
+
+  testWidgets('a mouse drag is recognized for text selection', (WidgetTester tester) async {
+    await pumpGestureDetector(tester);
+
+    const int pointerValue = 1;
+    final TestGesture gesture =
+        await tester.startGesture(const Offset(200.0, 200.0), pointer: pointerValue, kind: PointerDeviceKind.mouse);
+    await tester.pump();
+    await gesture.moveBy(const Offset(210.0, 200.0));
+    await tester.pump();
+    await gesture.up();
+    await tester.pumpAndSettle();
+
+    expect(tapCount, 0);
+    expect(singleTapUpCount, 0);
+    expect(dragStartCount, 1);
+    expect(dragUpdateCount, 1);
+    expect(dragEndCount, 1);
+  });
+
+  testWidgets('a slow mouse drag is still recognized for text selection', (WidgetTester tester) async {
+    await pumpGestureDetector(tester);
+
+    const int pointerValue = 1;
+    final TestGesture gesture =
+        await tester.startGesture(const Offset(200.0, 200.0), pointer: pointerValue, kind: PointerDeviceKind.mouse);
+    await tester.pump(const Duration(seconds: 2));
+    await gesture.moveBy(const Offset(210.0, 200.0));
+    await tester.pump();
+    await gesture.up();
+    await tester.pumpAndSettle();
+
+    expect(dragStartCount, 1);
+    expect(dragUpdateCount, 1);
+    expect(dragEndCount, 1);
+  });
 }

packages/flutter_test/lib/src/controller.dart

@@ -553,8 +553,12 @@ abstract class WidgetController {
   ///
   /// You can use [createGesture] if your gesture doesn't begin with an initial
   /// down gesture.
-  Future<TestGesture> startGesture(Offset downLocation, {int pointer}) async {
+  Future<TestGesture> startGesture(
-    final TestGesture result = await createGesture(pointer: pointer);
+    Offset downLocation, {
+    int pointer,
+    PointerDeviceKind kind = PointerDeviceKind.touch,
+  }) async {
+    final TestGesture result = await createGesture(pointer: pointer, kind: kind);
     await result.down(downLocation);
     return result;
   }