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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/browser/renderer_host/input/synthetic_gesture_controller.h"
      6 
      7 #include "base/debug/trace_event.h"
      8 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
      9 #include "content/common/input/synthetic_smooth_scroll_gesture_params.h"
     10 #include "content/common/input_messages.h"
     11 #include "content/public/browser/render_widget_host.h"
     12 
     13 namespace content {
     14 
     15 SyntheticGestureController::SyntheticGestureController(
     16     scoped_ptr<SyntheticGestureTarget> gesture_target)
     17     : gesture_target_(gesture_target.Pass()) {}
     18 
     19 SyntheticGestureController::~SyntheticGestureController() {}
     20 
     21 void SyntheticGestureController::QueueSyntheticGesture(
     22     scoped_ptr<SyntheticGesture> synthetic_gesture,
     23     const OnGestureCompleteCallback& completion_callback) {
     24   DCHECK(synthetic_gesture);
     25 
     26   bool was_empty = pending_gesture_queue_.IsEmpty();
     27 
     28   pending_gesture_queue_.Push(synthetic_gesture.Pass(), completion_callback);
     29 
     30   if (was_empty)
     31     StartGesture(*pending_gesture_queue_.FrontGesture());
     32 }
     33 
     34 void SyntheticGestureController::Flush(base::TimeTicks timestamp) {
     35   TRACE_EVENT0("input", "SyntheticGestureController::Flush");
     36   if (pending_gesture_queue_.IsEmpty())
     37     return;
     38 
     39   if (pending_gesture_result_)
     40     return;
     41 
     42   SyntheticGesture* gesture = pending_gesture_queue_.FrontGesture();
     43   SyntheticGesture::Result result =
     44       gesture->ForwardInputEvents(timestamp, gesture_target_.get());
     45 
     46   if (result == SyntheticGesture::GESTURE_RUNNING) {
     47     gesture_target_->SetNeedsFlush();
     48     return;
     49   }
     50 
     51   // It's possible that all events generated by the gesture have been fully
     52   // dispatched at this point, in which case |OnDidFlushInput()| was called
     53   // before |pending_gesture_result_| was initialized. Requesting another flush
     54   // will trigger the necessary gesture-ending call to |OnDidFlushInput()|.
     55   pending_gesture_result_.reset(new SyntheticGesture::Result(result));
     56   gesture_target_->SetNeedsFlush();
     57 }
     58 
     59 void SyntheticGestureController::OnDidFlushInput() {
     60   if (!pending_gesture_result_)
     61     return;
     62 
     63   DCHECK(!pending_gesture_queue_.IsEmpty());
     64   StopGesture(*pending_gesture_queue_.FrontGesture(),
     65               pending_gesture_queue_.FrontCallback(),
     66               *pending_gesture_result_.Pass());
     67   pending_gesture_queue_.Pop();
     68 
     69   if (!pending_gesture_queue_.IsEmpty())
     70     StartGesture(*pending_gesture_queue_.FrontGesture());
     71 }
     72 
     73 void SyntheticGestureController::StartGesture(const SyntheticGesture& gesture) {
     74   TRACE_EVENT_ASYNC_BEGIN0("input,benchmark",
     75                            "SyntheticGestureController::running",
     76                            &gesture);
     77   gesture_target_->SetNeedsFlush();
     78 }
     79 
     80 void SyntheticGestureController::StopGesture(
     81     const SyntheticGesture& gesture,
     82     const OnGestureCompleteCallback& completion_callback,
     83     SyntheticGesture::Result result) {
     84   DCHECK_NE(result, SyntheticGesture::GESTURE_RUNNING);
     85   TRACE_EVENT_ASYNC_END0("input,benchmark",
     86                          "SyntheticGestureController::running",
     87                          &gesture);
     88 
     89   completion_callback.Run(result);
     90 }
     91 
     92 SyntheticGestureController::GestureAndCallbackQueue::GestureAndCallbackQueue() {
     93 }
     94 
     95 SyntheticGestureController::GestureAndCallbackQueue::
     96     ~GestureAndCallbackQueue() {
     97 }
     98 
     99 }  // namespace content
    100