ui/chromeos/network/network_icon_animation.cc

   1 // Copyright (c) 2013 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 "ui/chromeos/network/network_icon_animation.h"
   6
   7 #include "ui/chromeos/network/network_icon_animation_observer.h"
   8
   9 namespace {
  10 const int kThrobDurationMs = 750;  // Animation cycle length.
  11 }
  12
  13 namespace ui {
  14 namespace network_icon {
  15
  16 NetworkIconAnimation::NetworkIconAnimation()
  17     : animation_(this) {
  18   // Set up the animation throbber.
  19   animation_.SetThrobDuration(kThrobDurationMs);
  20   animation_.SetTweenType(gfx::Tween::LINEAR);
  21 }
  22
  23 NetworkIconAnimation::~NetworkIconAnimation() {
  24 }
  25
  26 void NetworkIconAnimation::AnimationProgressed(
  27     const gfx::Animation* animation) {
  28   if (animation != &animation_)
  29     return;
  30   FOR_EACH_OBSERVER(AnimationObserver, observers_, NetworkIconChanged());
  31 }
  32
  33 double NetworkIconAnimation::GetAnimation() {
  34   if (!animation_.is_animating()) {
  35     animation_.Reset();
  36     animation_.StartThrobbing(-1 /*throb indefinitely*/);
  37     return 0;
  38   }
  39   return animation_.GetCurrentValue();
  40 }
  41
  42 void NetworkIconAnimation::AddObserver(AnimationObserver* observer) {
  43   if (!observers_.HasObserver(observer))
  44     observers_.AddObserver(observer);
  45 }
  46
  47 void NetworkIconAnimation::RemoveObserver(AnimationObserver* observer) {
  48   observers_.RemoveObserver(observer);
  49   if (!observers_.might_have_observers())
  50     animation_.Reset();  // Stops the animation and resets the current value.
  51 }
  52
  53 // static
  54 NetworkIconAnimation* NetworkIconAnimation::GetInstance() {
  55   static NetworkIconAnimation* s_icon_animation =
  56       new NetworkIconAnimation();
  57   return s_icon_animation;
  58 }
  59
  60 }  // namespace network_icon
  61 }  // namespace ui