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| 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 "chrome/browser/ui/tabs/tab_audio_indicator.h" |
| 6 |
| 7 #include "grit/theme_resources.h" |
| 8 #include "ui/base/animation/animation_container.h" |
| 9 #include "ui/base/animation/linear_animation.h" |
| 10 #include "ui/base/resource/resource_bundle.h" |
| 11 #include "ui/gfx/canvas.h" |
| 12 #include "ui/gfx/rect.h" |
| 13 |
| 14 namespace { |
| 15 |
| 16 // The number of columns to draw for the equalizer graphic. |
| 17 const size_t kEqualizerColumnCount = 3; |
| 18 |
| 19 // The maximum level for the equalizer. |
| 20 const size_t kEqualizerMaxLevel = 8; |
| 21 |
| 22 // The equalizer cycles between these frames. An equalizer frame is 3 columns |
| 23 // where each column ranges from 0 to |kEqualizerMaxLevel|. TODO(sail): Replace |
| 24 // this with levels from the actual audio source. |
| 25 const size_t kEqualizerFrames[][kEqualizerColumnCount] = { |
| 26 { 7, 5, 3 }, |
| 27 { 4, 5, 7 }, |
| 28 { 4, 2, 5 }, |
| 29 { 3, 7, 4 }, |
| 30 { 2, 3, 2 }, |
| 31 { 3, 4, 3 }, |
| 32 }; |
| 33 |
| 34 // The duration of each equalizer frame. |
| 35 const size_t kAnimationCycleDurationMs = 300; |
| 36 |
| 37 // The duration of the "ending" animation once audio stops playing. |
| 38 const size_t kAnimationEndingDurationMs = 1000; |
| 39 |
| 40 // Target frames per second. In reality fewer frames are drawn because the |
| 41 // equalizer levels change slowly. |
| 42 const int kFPS = 15; |
| 43 |
| 44 } // namespace |
| 45 |
| 46 TabAudioIndicator::TabAudioIndicator(Delegate* delegate) |
| 47 : delegate_(delegate), |
| 48 frame_index_(0), |
| 49 state_(STATE_NOT_ANIMATING) { |
| 50 } |
| 51 |
| 52 TabAudioIndicator::~TabAudioIndicator() { |
| 53 } |
| 54 |
| 55 void TabAudioIndicator::SetAnimationContainer( |
| 56 ui::AnimationContainer* animation_container) { |
| 57 animation_container_ = animation_container; |
| 58 } |
| 59 |
| 60 void TabAudioIndicator::SetIsPlayingAudio(bool is_playing_audio) { |
| 61 if (is_playing_audio && state_ != STATE_ANIMATING) { |
| 62 state_ = STATE_ANIMATING; |
| 63 animation_.reset( |
| 64 new ui::LinearAnimation(kAnimationCycleDurationMs, kFPS, this)); |
| 65 animation_->SetContainer(animation_container_); |
| 66 animation_->Start(); |
| 67 } else if (!is_playing_audio && state_ == STATE_ANIMATING) { |
| 68 state_ = STATE_ANIMATION_ENDING; |
| 69 animation_.reset( |
| 70 new ui::LinearAnimation(kAnimationEndingDurationMs, kFPS, this)); |
| 71 animation_->SetContainer(animation_container_); |
| 72 animation_->Start(); |
| 73 } |
| 74 } |
| 75 |
| 76 bool TabAudioIndicator::IsAnimating() { |
| 77 return state_ != STATE_NOT_ANIMATING; |
| 78 } |
| 79 |
| 80 void TabAudioIndicator::Paint(gfx::Canvas* canvas, const gfx::Rect& rect) { |
| 81 if (state_ == STATE_NOT_ANIMATING) |
| 82 return; |
| 83 |
| 84 canvas->Save(); |
| 85 canvas->ClipRect(rect); |
| 86 |
| 87 // Draw 3 equalizer columns. |IDR_AUDIO_EQUALIZER_COLUMN| is a column of the |
| 88 // equalizer with 8 levels. The current level is between 0 and 8 so the |
| 89 // image is shifted down and then drawn. |
| 90 ui::ResourceBundle& rb = ResourceBundle::GetSharedInstance(); |
| 91 gfx::ImageSkia* image(rb.GetImageSkiaNamed(IDR_AUDIO_EQUALIZER_COLUMN)); |
| 92 int x = rect.x(); |
| 93 std::vector<int> levels = GetCurrentEqualizerLevels(); |
| 94 for (size_t i = 0; i < levels.size(); ++i) { |
| 95 // Shift the image down by the level. For example, for level 8 draw the |
| 96 // image at rect.y(), For level 7, draw the image at rect.y() - 2, etc... |
| 97 int y = rect.y() + (kEqualizerMaxLevel - levels[i]) * 2; |
| 98 canvas->DrawImageInt(*image, x, y); |
| 99 x += image->width() - 1; |
| 100 } |
| 101 |
| 102 canvas->Restore(); |
| 103 |
| 104 // Cache the levels that were just drawn. This is used to prevent unnecessary |
| 105 // drawing when animation progress doesn't result in equalizer levels |
| 106 // changing. |
| 107 last_displayed_equalizer_levels_ = levels; |
| 108 } |
| 109 |
| 110 void TabAudioIndicator::AnimationProgressed(const ui::Animation* animation) { |
| 111 std::vector<int> levels = GetCurrentEqualizerLevels(); |
| 112 if (last_displayed_equalizer_levels_ != levels) |
| 113 delegate_->ScheduleAudioIndicatorPaint(); |
| 114 } |
| 115 |
| 116 void TabAudioIndicator::AnimationEnded(const ui::Animation* animation) { |
| 117 if (state_ == STATE_ANIMATING) { |
| 118 // The current equalizer frame animation has finished. Start animating the |
| 119 // next frame. |
| 120 frame_index_ = (frame_index_ + 1) % arraysize(kEqualizerFrames); |
| 121 animation_->Start(); |
| 122 } else if (state_ == STATE_ANIMATION_ENDING) { |
| 123 // The "ending" animation has stopped. Update the tab state so that the UI |
| 124 // can update the tab icon. |
| 125 state_ = STATE_NOT_ANIMATING; |
| 126 delegate_->ScheduleAudioIndicatorPaint(); |
| 127 } |
| 128 } |
| 129 |
| 130 std::vector<int> TabAudioIndicator::GetCurrentEqualizerLevels() const { |
| 131 int next_frame_index = (frame_index_ + 1) % arraysize(kEqualizerFrames); |
| 132 std::vector<int> levels; |
| 133 // For all 3 columsn of the equalizer, tween between the current equalizer |
| 134 // level and the target equalizer level. |
| 135 for (size_t i = 0; i < kEqualizerColumnCount; ++i) { |
| 136 int start = kEqualizerFrames[frame_index_][i]; |
| 137 int end = state_ == STATE_ANIMATION_ENDING |
| 138 ? 0 |
| 139 : kEqualizerFrames[next_frame_index][i]; |
| 140 levels.push_back(animation_->CurrentValueBetween(start, end)); |
| 141 } |
| 142 return levels; |
| 143 } |
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