ash/wm/workspace/two_step_edge_cycler.cc

   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