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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/tabs/tab_audio_indicator.h"
#include "grit/theme_resources.h"
#include "ui/base/animation/animation_container.h"
#include "ui/base/animation/linear_animation.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/rect.h"
namespace {
// The number of columns to draw for the equalizer graphic.
const size_t kEqualizerColumnCount = 3;
// The maximum level for the equalizer.
const size_t kEqualizerMaxLevel = 8;
// The equalizer cycles between these frames. An equalizer frame is 3 columns
// where each column ranges from 0 to |kEqualizerMaxLevel|. TODO(sail): Replace
// this with levels from the actual audio source.
const size_t kEqualizerFrames[][kEqualizerColumnCount] = {
{ 7, 5, 3 },
{ 4, 5, 7 },
{ 4, 2, 5 },
{ 3, 7, 4 },
{ 2, 3, 2 },
{ 3, 4, 3 },
};
// The duration of each equalizer frame.
const size_t kAnimationCycleDurationMs = 300;
// The duration of the "ending" animation once audio stops playing.
const size_t kAnimationEndingDurationMs = 1000;
// Target frames per second. In reality fewer frames are drawn because the
// equalizer levels change slowly.
const int kFPS = 15;
} // namespace
TabAudioIndicator::TabAudioIndicator(Delegate* delegate)
: delegate_(delegate),
frame_index_(0),
state_(STATE_NOT_ANIMATING) {
}
TabAudioIndicator::~TabAudioIndicator() {
}
void TabAudioIndicator::SetAnimationContainer(
ui::AnimationContainer* animation_container) {
animation_container_ = animation_container;
}
void TabAudioIndicator::SetIsPlayingAudio(bool is_playing_audio) {
if (is_playing_audio && state_ != STATE_ANIMATING) {
state_ = STATE_ANIMATING;
animation_.reset(
new ui::LinearAnimation(kAnimationCycleDurationMs, kFPS, this));
animation_->SetContainer(animation_container_);
animation_->Start();
} else if (!is_playing_audio && state_ == STATE_ANIMATING) {
state_ = STATE_ANIMATION_ENDING;
animation_.reset(
new ui::LinearAnimation(kAnimationEndingDurationMs, kFPS, this));
animation_->SetContainer(animation_container_);
animation_->Start();
}
}
bool TabAudioIndicator::IsAnimating() {
return state_ != STATE_NOT_ANIMATING;
}
void TabAudioIndicator::Paint(gfx::Canvas* canvas, const gfx::Rect& rect) {
if (state_ == STATE_NOT_ANIMATING)
return;
canvas->Save();
canvas->ClipRect(rect);
// Draw 3 equalizer columns. |IDR_AUDIO_EQUALIZER_COLUMN| is a column of the
// equalizer with 8 levels. The current level is between 0 and 8 so the
// image is shifted down and then drawn.
ui::ResourceBundle& rb = ResourceBundle::GetSharedInstance();
gfx::ImageSkia* image(rb.GetImageSkiaNamed(IDR_AUDIO_EQUALIZER_COLUMN));
int x = rect.x();
std::vector<int> levels = GetCurrentEqualizerLevels();
for (size_t i = 0; i < levels.size(); ++i) {
// Shift the image down by the level. For example, for level 8 draw the
// image at rect.y(), For level 7, draw the image at rect.y() - 2, etc...
int y = rect.y() + (kEqualizerMaxLevel - levels[i]) * 2;
canvas->DrawImageInt(*image, x, y);
x += image->width() - 1;
}
canvas->Restore();
// Cache the levels that were just drawn. This is used to prevent unnecessary
// drawing when animation progress doesn't result in equalizer levels
// changing.
last_displayed_equalizer_levels_ = levels;
}
void TabAudioIndicator::AnimationProgressed(const ui::Animation* animation) {
std::vector<int> levels = GetCurrentEqualizerLevels();
if (last_displayed_equalizer_levels_ != levels)
delegate_->ScheduleAudioIndicatorPaint();
}
void TabAudioIndicator::AnimationEnded(const ui::Animation* animation) {
if (state_ == STATE_ANIMATING) {
// The current equalizer frame animation has finished. Start animating the
// next frame.
frame_index_ = (frame_index_ + 1) % arraysize(kEqualizerFrames);
animation_->Start();
} else if (state_ == STATE_ANIMATION_ENDING) {
// The "ending" animation has stopped. Update the tab state so that the UI
// can update the tab icon.
state_ = STATE_NOT_ANIMATING;
delegate_->ScheduleAudioIndicatorPaint();
}
}
std::vector<int> TabAudioIndicator::GetCurrentEqualizerLevels() const {
int next_frame_index = (frame_index_ + 1) % arraysize(kEqualizerFrames);
std::vector<int> levels;
// For all 3 columsn of the equalizer, tween between the current equalizer
// level and the target equalizer level.
for (size_t i = 0; i < kEqualizerColumnCount; ++i) {
int start = kEqualizerFrames[frame_index_][i];
int end = state_ == STATE_ANIMATION_ENDING
? 0
: kEqualizerFrames[next_frame_index][i];
levels.push_back(animation_->CurrentValueBetween(start, end));
}
return levels;
}
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