ui/gfx/animation/throb_animation.cc

   1 // Copyright (c) 2012 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/gfx/animation/throb_animation.h"
   6
   7 #include <limits>
   8
   9 namespace gfx {
  10
  11 static const int kDefaultThrobDurationMS = 400;
  12
  13 ThrobAnimation::ThrobAnimation(AnimationDelegate* target)
  14     : SlideAnimation(target),
  15       slide_duration_(GetSlideDuration()),
  16       throb_duration_(kDefaultThrobDurationMS),
  17       cycles_remaining_(0),
  18       throbbing_(false) {
  19 }
  20
  21 void ThrobAnimation::StartThrobbing(int cycles_til_stop) {
  22   cycles_til_stop = cycles_til_stop >= 0 ? cycles_til_stop :
  23                                            std::numeric_limits<int>::max();
  24   cycles_remaining_ = cycles_til_stop;
  25   throbbing_ = true;
  26   SlideAnimation::SetSlideDuration(throb_duration_);
  27   if (is_animating())
  28     return;  // We're already running, we'll cycle when current loop finishes.
  29
  30   if (IsShowing())
  31     SlideAnimation::Hide();
  32   else
  33     SlideAnimation::Show();
  34   cycles_remaining_ = cycles_til_stop;
  35 }
  36
  37 void ThrobAnimation::Reset() {
  38   Reset(0);
  39 }
  40
  41 void ThrobAnimation::Reset(double value) {
  42   ResetForSlide();
  43   SlideAnimation::Reset(value);
  44 }
  45
  46 void ThrobAnimation::Show() {
  47   ResetForSlide();
  48   SlideAnimation::Show();
  49 }
  50
  51 void ThrobAnimation::Hide() {
  52   ResetForSlide();
  53   SlideAnimation::Hide();
  54 }
  55
  56 void ThrobAnimation::SetSlideDuration(int duration) {
  57   slide_duration_ = duration;
  58 }
  59
  60 void ThrobAnimation::Step(base::TimeTicks time_now) {
  61   LinearAnimation::Step(time_now);
  62
  63   if (!is_animating() && throbbing_) {
  64     // Were throbbing a finished a cycle. Start the next cycle unless we're at
  65     // the end of the cycles, in which case we stop.
  66     cycles_remaining_--;
  67     if (IsShowing()) {
  68       // We want to stop hidden, hence this doesn't check cycles_remaining_.
  69       SlideAnimation::Hide();
  70     } else if (cycles_remaining_ > 0) {
  71       SlideAnimation::Show();
  72     } else {
  73       // We're done throbbing.
  74       throbbing_ = false;
  75     }
  76   }
  77 }
  78
  79 void ThrobAnimation::ResetForSlide() {
  80   SlideAnimation::SetSlideDuration(slide_duration_);
  81   cycles_remaining_ = 0;
  82   throbbing_ = false;
  83 }
  84
  85 }  // namespace gfx