Index: content/browser/renderer_host/input/mouse_wheel_phase_handler.h |
diff --git a/content/browser/renderer_host/input/mouse_wheel_phase_handler.h b/content/browser/renderer_host/input/mouse_wheel_phase_handler.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..aa4a20e4942b239d56b661a7c71e8d27ebcbcf80 |
--- /dev/null |
+++ b/content/browser/renderer_host/input/mouse_wheel_phase_handler.h |
@@ -0,0 +1,50 @@ |
+// Copyright (c) 2017 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. |
+ |
+#ifndef MOUSE_WHEEL_PHASE_HANDLER_H_ |
+#define MOUSE_WHEEL_PHASE_HANDLER_H_ |
+ |
+#include "base/timer/timer.h" |
+#include "content/browser/renderer_host/render_widget_host_delegate.h" |
+ |
+namespace content { |
+class RenderWidgetHostImpl; |
+class RenderWidgetHostViewBase; |
+ |
+// The duration after which a synthetic wheel with zero deltas and |
+// phase = |kPhaseEnded| will be sent after the last wheel event. |
+const int64_t kDefaultMouseWheelLatchingTransactionMs = 100; |
+ |
+class MouseWheelPhaseHandler { |
+ public: |
+ MouseWheelPhaseHandler(RenderWidgetHostImpl* const host, |
+ RenderWidgetHostViewBase* const host_view); |
+ ~MouseWheelPhaseHandler() {} |
+ |
+ void AddPhaseIfNeededAndScheduleEndEvent( |
+ blink::WebMouseWheelEvent& mouse_wheel_event, |
+ bool should_route_event); |
+ void DispatchPendingWheelEndEvent(); |
+ void IgnorePendingWheelEndEvent(); |
+ bool HasPendingWheelEndEvent() const { |
+ return mouse_wheel_end_dispatch_timer_.IsRunning(); |
+ } |
+ |
+ private: |
+ void SendSyntheticWheelEventWithPhaseEnded( |
+ blink::WebMouseWheelEvent last_mouse_wheel_event, |
+ bool should_route_event); |
+ void ScheduleMouseWheelEndDispatching(blink::WebMouseWheelEvent wheel_event, |
+ bool should_route_event); |
+ |
+ RenderWidgetHostImpl* const host_; |
+ RenderWidgetHostViewBase* const host_view_; |
+ base::OneShotTimer mouse_wheel_end_dispatch_timer_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(MouseWheelPhaseHandler); |
+}; |
+ |
+} // namespace content |
+ |
+#endif // MOUSE_WHEEL_PHASE_HANDLER_H_ |