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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/wm/workspace/two_step_edge_cycler.h"
#include <cstdlib>
namespace ash {
namespace {
// We cycle to the second mode if any of the following happens while the mouse
// is on the edge of the workspace:
// . The user stops moving the mouse for |kMaxDelay| and then moves the mouse
// again in the preferred direction from the last paused location for at least
// |kMaxPixelsAfterPause| horizontal pixels.
// . The mouse moves |kMaxPixels| horizontal pixels in the preferred direction.
// . The mouse is moved |kMaxMoves| times since the last pause.
const int kMaxDelay = 400;
const int kMaxPixels = 100;
const int kMaxPixelsAfterPause = 10;
const int kMaxMoves = 25;
} // namespace
TwoStepEdgeCycler::TwoStepEdgeCycler(const gfx::Point& start,
TwoStepEdgeCycler::Direction direction)
: second_mode_(false),
time_last_move_(base::TimeTicks::Now()),
num_moves_(0),
start_x_(start.x()),
paused_x_(start.x()),
paused_(false),
direction_(direction) {
}
TwoStepEdgeCycler::~TwoStepEdgeCycler() {
}
void TwoStepEdgeCycler::OnMove(const gfx::Point& location) {
if (second_mode_)
return;
if ((base::TimeTicks::Now() - time_last_move_).InMilliseconds() > kMaxDelay) {
paused_ = true;
paused_x_ = location.x();
num_moves_ = 0;
}
time_last_move_ = base::TimeTicks::Now();
int compare_x = paused_ ? paused_x_ : start_x_;
if (location.x() != compare_x &&
(location.x() < compare_x) != (direction_ == DIRECTION_LEFT)) {
return;
}
++num_moves_;
bool moved_in_the_same_direction_after_pause =
paused_ && std::abs(location.x() - paused_x_) >= kMaxPixelsAfterPause;
second_mode_ = moved_in_the_same_direction_after_pause ||
std::abs(location.x() - start_x_) >= kMaxPixels ||
num_moves_ >= kMaxMoves;
}
} // namespace ash
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