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
9namespace ash {
10namespace {
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.
18const int kMaxDelay = 500;
19const int kMaxPixels = 100;
20const int kMaxMoves = 25;
21
22}  // namespace
23
24TwoStepEdgeCycler::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
31TwoStepEdgeCycler::~TwoStepEdgeCycler() {
32}
33
34void 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