[Android] Support double-tap selection

ui/events/gesture_detection/gesture_provider_unittest.cc

Index: ui/events/gesture_detection/gesture_provider_unittest.cc
diff --git a/ui/events/gesture_detection/gesture_provider_unittest.cc b/ui/events/gesture_detection/gesture_provider_unittest.cc
index 5f82dae308760c4f360824f8f30b43e9590c9113..8ae146dee20b694026976f6700bd83921f50591b 100644
--- a/ui/events/gesture_detection/gesture_provider_unittest.cc
+++ b/ui/events/gesture_detection/gesture_provider_unittest.cc
@@ -266,6 +266,12 @@ class GestureProviderTest : public testing::Test, public GestureProviderClient {
     SetUpWithConfig(config);
   }
 
+  void SetSingleTapRepeatLength(int repeat_length) {
+    GestureProvider::Config config = GetDefaultConfig();
+    config.gesture_detector_config.single_tap_repeat_length = repeat_length;
+    SetUpWithConfig(config);
+  }
+
   bool HasDownEvent() const { return gesture_provider_->current_down_event(); }
 
  protected:
@@ -2523,4 +2529,70 @@ TEST_F(GestureProviderTest, BoundingBoxForShowPressAndTapGesture) {
             GetMostRecentGestureEvent().details.bounding_box_f());
 }
 
+TEST_F(GestureProviderTest, SingleTapRepeat) {
+  SetSingleTapRepeatLength(3);

[tdresser, 2015/09/23 14:10:46]

Do we have adequate coverage of when the repeat length is 1?

[jdduke (slow), 2015/09/23 19:56:04]

Probably not, I'll add a test.

+
+  gesture_provider_->SetDoubleTapSupportForPlatformEnabled(false);
+
+  base::TimeTicks event_time = base::TimeTicks::Now();
+
+  MockMotionEvent event =
+      ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_UP);
+  gesture_provider_->OnTouchEvent(event);
+  EXPECT_EQ(ET_GESTURE_TAP, GetMostRecentGestureEventType());
+  EXPECT_EQ(1, GetMostRecentGestureEvent().details.tap_count());
+
+  // A secondary tap within the tap repeat period should increment
+  // the tap count.
+  event_time += GetValidDoubleTapDelay();
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_UP);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(ET_GESTURE_TAP, GetMostRecentGestureEventType());
+  EXPECT_EQ(2, GetMostRecentGestureEvent().details.tap_count());
+
+  // A secondary tap within the tap repeat location threshold should increment
+  // the tap count.
+  event_time += GetValidDoubleTapDelay();
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN, kFakeCoordX,
+                            kFakeCoordY + GetTouchSlop() / 2);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_UP);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(ET_GESTURE_TAP, GetMostRecentGestureEventType());
+  EXPECT_EQ(3, GetMostRecentGestureEvent().details.tap_count());
+
+  // The tap count should reset after hitting the repeat length.
+  event_time += GetValidDoubleTapDelay();
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_UP);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  EXPECT_EQ(ET_GESTURE_TAP, GetMostRecentGestureEventType());
+  EXPECT_EQ(1, GetMostRecentGestureEvent().details.tap_count());
+
+  // If double-tap is enabled, the tap repeat count should always be 1.
+  gesture_provider_->SetDoubleTapSupportForPlatformEnabled(true);
+  event_time += GetValidDoubleTapDelay();
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_UP);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  RunTasksAndWait(GetDoubleTapTimeout());
+  EXPECT_EQ(ET_GESTURE_TAP, GetMostRecentGestureEventType());
+  EXPECT_EQ(1, GetMostRecentGestureEvent().details.tap_count());
+
+  event_time += GetValidDoubleTapDelay();
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_DOWN);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  event = ObtainMotionEvent(event_time, MotionEvent::ACTION_UP);
+  EXPECT_TRUE(gesture_provider_->OnTouchEvent(event));
+  RunTasksAndWait(GetDoubleTapTimeout());
+  EXPECT_EQ(ET_GESTURE_TAP, GetMostRecentGestureEventType());
+  EXPECT_EQ(1, GetMostRecentGestureEvent().details.tap_count());
+}
+
 }  // namespace ui