Defer synthetic gesture completions until events have been flushed

content/browser/renderer_host/input/input_router_impl.h

 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_
 
 #include <queue>
 
 #include "base/basictypes.h"
@@ skipping 162 matching lines @@
 
   void SimulateTouchGestureWithMouse(
       const MouseEventWithLatencyInfo& mouse_event);
 
   // Called when a touch timeout-affecting bit has changed, in turn toggling the
   // touch ack timeout feature of the |touch_event_queue_| as appropriate. Input
   // to that determination includes current view properties, the allowed touch
   // action and the command-line configured |touch_ack_timeout_supported_|.
   void UpdateTouchAckTimeoutEnabled();
 
+  // If a flush has been requested, signals a completed flush to the client if
+  // all events have been dispatched (i.e., |HasPendingEvents()| is false).
+  void SignalFlushedIfNecessary();
+
+  bool HasPendingEvents() const;
+
   bool IsInOverscrollGesture() const;
 
   int routing_id() const { return routing_id_; }
 
 
   IPC::Sender* sender_;
   InputRouterClient* client_;
   InputAckHandler* ack_handler_;
   int routing_id_;
 
@@ skipping 15 matching lines @@
 
   // The next mouse move event to send (only non-null while mouse_move_pending_
   // is true).
   scoped_ptr<MouseEventWithLatencyInfo> next_mouse_move_;
 
   // (Similar to |mouse_move_pending_|.) True if a mouse wheel event was sent
   // and we are waiting for a corresponding ack.
   bool mouse_wheel_pending_;
   MouseWheelEventWithLatencyInfo current_wheel_event_;
 
-  typedef std::deque<MouseWheelEventWithLatencyInfo> WheelEventQueue;
-
   // (Similar to |next_mouse_move_|.) The next mouse wheel events to send.
   // Unlike mouse moves, mouse wheel events received while one is pending are
   // coalesced (by accumulating deltas) if they match the previous event in
   // modifiers. On the Mac, in particular, mouse wheel events are received at a
   // high rate; not waiting for the ack results in jankiness, and using the same
   // mechanism as for mouse moves (just dropping old events when multiple ones
   // would be queued) results in very slow scrolling.
+  typedef std::deque<MouseWheelEventWithLatencyInfo> WheelEventQueue;
   WheelEventQueue coalesced_mouse_wheel_events_;
 
-  // The time when an input event was sent to the RenderWidget.
-  base::TimeTicks input_event_start_time_;
-
-  // Queue of keyboard events that we need to track.
-  typedef std::deque<NativeWebKeyboardEvent> KeyQueue;
-
   // A queue of keyboard events. We can't trust data from the renderer so we
   // stuff key events into a queue and pop them out on ACK, feeding our copy
   // back to whatever unhandled handler instead of the returned version.
+  typedef std::deque<NativeWebKeyboardEvent> KeyQueue;
   KeyQueue key_queue_;
 
+  // The time when an input event was sent to the client.
+  base::TimeTicks input_event_start_time_;
+
   // Whether touch ack timeout handling has been enabled via the command line.
   bool touch_ack_timeout_supported_;
   base::TimeDelta touch_ack_timeout_delay_;
 
   // Cached flags from |OnViewUpdated()|, defaults to 0.
   int current_view_flags_;
 
   // The source of the ack within the scope of |ProcessInputEventAck()|.
   // Defaults to ACK_SOURCE_NONE.
   AckSource current_ack_source_;
 
-  scoped_ptr<TouchEventQueue> touch_event_queue_;
-  scoped_ptr<GestureEventQueue> gesture_event_queue_;
+  // Whether a call to |Flush()| has yet been accompanied by a |DidFlush()| call
+  // to the client_ after all events have been dispatched/acked.
+  bool flush_requested_;
+
+  TouchEventQueue touch_event_queue_;
+  GestureEventQueue gesture_event_queue_;
   TouchActionFilter touch_action_filter_;
   InputEventStreamValidator event_stream_validator_;
 
   DISALLOW_COPY_AND_ASSIGN(InputRouterImpl);
 };
 
 }  // namespace content
 
 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_IMPL_H_