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      1 // Copyright 2014 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 "ash/wm/workspace/two_step_edge_cycler.h"
      6 
      7 #include <cstdlib>
      8 
      9 namespace ash {
     10 namespace {
     11 
     12 // We cycle to the second mode if any of the following happens while the mouse
     13 // is on the edge of the workspace:
     14 // . The user stops moving the mouse for |kMaxDelay| and then moves the mouse
     15 //   again.
     16 // . The mouse moves |kMaxPixels| horizontal pixels.
     17 // . The mouse is moved |kMaxMoves| times.
     18 const int kMaxDelay = 500;
     19 const int kMaxPixels = 100;
     20 const int kMaxMoves = 25;
     21 
     22 }  // namespace
     23 
     24 TwoStepEdgeCycler::TwoStepEdgeCycler(const gfx::Point& start)
     25     : second_mode_(false),
     26       time_last_move_(base::TimeTicks::Now()),
     27       num_moves_(0),
     28       start_x_(start.x()) {
     29 }
     30 
     31 TwoStepEdgeCycler::~TwoStepEdgeCycler() {
     32 }
     33 
     34 void TwoStepEdgeCycler::OnMove(const gfx::Point& location) {
     35   if (second_mode_)
     36     return;
     37 
     38   ++num_moves_;
     39   second_mode_ =
     40       (base::TimeTicks::Now() - time_last_move_).InMilliseconds() >
     41           kMaxDelay ||
     42       std::abs(location.x() - start_x_) >= kMaxPixels ||
     43       num_moves_ >= kMaxMoves;
     44   time_last_move_ = base::TimeTicks::Now();
     45 }
     46 
     47 }  // namespace ash
     48