src/content/browser/renderer_host/synthetic_gesture_calculator.cc

   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/synthetic_gesture_calculator.h"
   6
   7
   8 namespace {
   9
  10 const float kDefaultPositionDelta = 10.0f;
  11
  12 }
  13
  14
  15 namespace content {
  16
  17 SyntheticGestureCalculator::SyntheticGestureCalculator() {
  18 }
  19
  20 SyntheticGestureCalculator::~SyntheticGestureCalculator() {
  21 }
  22
  23 float SyntheticGestureCalculator::GetDelta(
  24     base::TimeTicks now, base::TimeDelta desired_interval) {
  25   float position_delta = kDefaultPositionDelta;
  26   if (!last_tick_time_.is_null()) {
  27     float velocity = kDefaultPositionDelta /
  28         (float)desired_interval.InMillisecondsF();
  29     float time_delta = (now - last_tick_time_).InMillisecondsF();
  30     position_delta = velocity * time_delta;
  31   }
  32
  33   last_tick_time_ = now;
  34   return position_delta;
  35 }
  36
  37 }  // namespace content