overscroll: Send all gesture-events to the gesture-event filter.

content/browser/renderer_host/render_widget_host_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/timer.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/renderer_host/backing_store.h"
@@ skipping 2692 matching lines @@
   SimulateWheelEvent(-35, -2, 0);
   EXPECT_EQ(1U, process_->sink().message_count());
   SendInputEventACK(WebInputEvent::MouseWheel, false);
   EXPECT_EQ(OVERSCROLL_WEST, host_->overscroll_mode());
   EXPECT_EQ(OVERSCROLL_WEST, host_->overscroll_delegate()->current_mode());
   EXPECT_EQ(-55.f, host_->overscroll_delta_x());
   EXPECT_EQ(-25.f, host_->overscroll_delegate()->delta_x());
   EXPECT_EQ(0.f, host_->overscroll_delegate()->delta_y());
 }
 
+TEST_F(RenderWidgetHostTest, ScrollEventsOverscrollWithFling) {
+  host_->SetupForOverscrollControllerTest();
+  process_->sink().ClearMessages();
+
+  // Send a wheel event. ACK the event as not processed. This should not
+  // initiate an overscroll gesture since it doesn't cross the threshold yet.
+  SimulateWheelEvent(10, -5, 0);
+  EXPECT_EQ(1U, process_->sink().message_count());
+  SendInputEventACK(WebInputEvent::MouseWheel, false);
+  EXPECT_EQ(OVERSCROLL_NONE, host_->overscroll_mode());
+  EXPECT_EQ(OVERSCROLL_NONE, host_->overscroll_delegate()->current_mode());
+  process_->sink().ClearMessages();
+
+  // Scroll some more so as to not overscroll.
+  SimulateWheelEvent(10, -4, 0);
+  EXPECT_EQ(1U, process_->sink().message_count());
+  SendInputEventACK(WebInputEvent::MouseWheel, false);
+  EXPECT_EQ(OVERSCROLL_NONE, host_->overscroll_mode());
+  EXPECT_EQ(OVERSCROLL_NONE, host_->overscroll_delegate()->current_mode());
+  process_->sink().ClearMessages();
+
+  // Scroll some more to initiate an overscroll.
+  SimulateWheelEvent(20, -4, 0);
+  EXPECT_EQ(1U, process_->sink().message_count());
+  SendInputEventACK(WebInputEvent::MouseWheel, false);
+  EXPECT_EQ(OVERSCROLL_EAST, host_->overscroll_mode());
+  EXPECT_EQ(OVERSCROLL_EAST, host_->overscroll_delegate()->current_mode());
+  EXPECT_EQ(40.f, host_->overscroll_delta_x());
+  EXPECT_EQ(10.f, host_->overscroll_delegate()->delta_x());
+  EXPECT_EQ(0.f, host_->overscroll_delegate()->delta_y());
+  process_->sink().ClearMessages();
+  EXPECT_EQ(0U, host_->GestureEventLastQueueEventSize());
+
+  // Send a fling start, but with a small velocity, so that the overscroll is
+  // aborted. The fling should proceed to the renderer, through the gesture
+  // event filter.
+  SimulateGestureFlingStartEvent(0.f, 0.f);
+  EXPECT_EQ(OVERSCROLL_NONE, host_->overscroll_mode());
+  EXPECT_EQ(1U, host_->GestureEventLastQueueEventSize());
+  EXPECT_EQ(1U, process_->sink().message_count());
+}
+
 // Tests that touch-scroll events are handled correctly by the overscroll
 // controller. This also tests that the overscroll controller and the
 // gesture-event filter play nice with each other.
 TEST_F(RenderWidgetHostTest, GestureScrollOverscrolls) {
   // Turn off debounce handling for test isolation.
   host_->SetupForOverscrollControllerTest();
   host_->set_debounce_interval_time_ms(0);
   process_->sink().ClearMessages();
 
   SimulateGestureEvent(WebInputEvent::GestureScrollBegin);
@@ skipping 378 matching lines @@
   EXPECT_EQ(1U, host_->GestureEventLastQueueEventSize());
   EXPECT_EQ(0U, host_->GestureEventDebouncingQueueSize());
 
   SendInputEventACK(WebKit::WebInputEvent::GestureScrollEnd, false);
   EXPECT_EQ(0U, process_->sink().message_count());
   EXPECT_EQ(0U, host_->GestureEventLastQueueEventSize());
   EXPECT_EQ(0U, host_->GestureEventDebouncingQueueSize());
 }
 
 }  // namespace content