ash/shelf/background_animator.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 "ash/shelf/background_animator.h"
   6
   7
   8 namespace ash {
   9 namespace {
  10
  11 // Duration of the background animation.
  12 const int kBackgroundDurationMS = 1000;
  13
  14 }
  15
  16 BackgroundAnimator::BackgroundAnimator(BackgroundAnimatorDelegate* delegate,
  17                                        int min_alpha,
  18                                        int max_alpha)
  19     : delegate_(delegate),
  20       min_alpha_(min_alpha),
  21       max_alpha_(max_alpha),
  22       animation_(this),
  23       paints_background_(false),
  24       alpha_(min_alpha) {
  25   animation_.SetSlideDuration(kBackgroundDurationMS);
  26 }
  27
  28 BackgroundAnimator::~BackgroundAnimator() {
  29 }
  30
  31 void BackgroundAnimator::SetDuration(int time_in_ms) {
  32   animation_.SetSlideDuration(time_in_ms);
  33 }
  34
  35 void BackgroundAnimator::SetPaintsBackground(
  36     bool value, BackgroundAnimatorChangeType type) {
  37   if (paints_background_ == value)
  38     return;
  39   paints_background_ = value;
  40   if (type == BACKGROUND_CHANGE_IMMEDIATE && !animation_.is_animating()) {
  41     animation_.Reset(value ? 1.0f : 0.0f);
  42     AnimationProgressed(&animation_);
  43     return;
  44   }
  45   if (paints_background_)
  46     animation_.Show();
  47   else
  48     animation_.Hide();
  49 }
  50
  51 void BackgroundAnimator::AnimationProgressed(const gfx::Animation* animation) {
  52   int alpha = animation->CurrentValueBetween(min_alpha_, max_alpha_);
  53   if (alpha_ == alpha)
  54     return;
  55   alpha_ = alpha;
  56   delegate_->UpdateBackground(alpha_);
  57 }
  58
  59 }  // namespace ash