root/ash/system/chromeos/network/network_icon_animation.cc

DEFINITIONS

1. AnimationProgressed
2. GetAnimation
3. AddObserver
4. RemoveObserver
5. GetInstance

// Copyright (c) 2013 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/system/chromeos/network/network_icon_animation.h"

#include "ash/system/chromeos/network/network_icon_animation_observer.h"

namespace {
const int kThrobDurationMs = 750;  // Animation cycle length.
}

namespace ash {
namespace network_icon {

NetworkIconAnimation::NetworkIconAnimation()
    : animation_(this) {
  // Set up the animation throbber.
  animation_.SetThrobDuration(kThrobDurationMs);
  animation_.SetTweenType(gfx::Tween::LINEAR);
}

NetworkIconAnimation::~NetworkIconAnimation() {
}

void NetworkIconAnimation::AnimationProgressed(
    const gfx::Animation* animation) {
  if (animation != &animation_)
    return;
  FOR_EACH_OBSERVER(AnimationObserver, observers_, NetworkIconChanged());
}

double NetworkIconAnimation::GetAnimation() {
  if (!animation_.is_animating()) {
    animation_.Reset();
    animation_.StartThrobbing(-1 /*throb indefinitely*/);
    return 0;
  }
  return animation_.GetCurrentValue();
}

void NetworkIconAnimation::AddObserver(AnimationObserver* observer) {
  if (!observers_.HasObserver(observer))
    observers_.AddObserver(observer);
}

void NetworkIconAnimation::RemoveObserver(AnimationObserver* observer) {
  observers_.RemoveObserver(observer);
  if (!observers_.might_have_observers())
    animation_.Reset();  // Stops the animation and resets the current value.
}

// static
NetworkIconAnimation* NetworkIconAnimation::GetInstance() {
  static NetworkIconAnimation* s_icon_animation =
      new NetworkIconAnimation();
  return s_icon_animation;
}

}  // namespace network_icon
}  // namespace ash