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