Refactor the TrayAudio code so that it can be used by other platforms.

ash/system/chromeos/audio/audio_detailed_view.cc

+// Copyright 2014 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 "ash/system/chromeos/audio/audio_detailed_view.h"
+
+#include "ash/system/tray/fixed_sized_scroll_view.h"
+#include "ash/system/tray/hover_highlight_view.h"
+#include "ash/system/tray/tray_constants.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chromeos/audio/cras_audio_handler.h"
+#include "grit/ash_resources.h"
+#include "grit/ash_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/views/border.h"
+#include "ui/views/controls/label.h"
+
+namespace {
+
+base::string16 GetAudioDeviceName(const chromeos::AudioDevice& device) {
+  switch(device.type) {
+    case chromeos::AUDIO_TYPE_HEADPHONE:
+      return l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_AUDIO_HEADPHONE);
+    case chromeos::AUDIO_TYPE_INTERNAL_SPEAKER:
+      return l10n_util::GetStringUTF16(
+          IDS_ASH_STATUS_TRAY_AUDIO_INTERNAL_SPEAKER);
+    case chromeos::AUDIO_TYPE_INTERNAL_MIC:
+      return l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_AUDIO_INTERNAL_MIC);
+    case chromeos::AUDIO_TYPE_USB:
+      return l10n_util::GetStringFUTF16(
+          IDS_ASH_STATUS_TRAY_AUDIO_USB_DEVICE,
+          base::UTF8ToUTF16(device.display_name));
+    case chromeos::AUDIO_TYPE_BLUETOOTH:
+      return l10n_util::GetStringFUTF16(
+          IDS_ASH_STATUS_TRAY_AUDIO_BLUETOOTH_DEVICE,
+          base::UTF8ToUTF16(device.display_name));
+    case chromeos::AUDIO_TYPE_HDMI:
+      return l10n_util::GetStringFUTF16(
+          IDS_ASH_STATUS_TRAY_AUDIO_HDMI_DEVICE,
+          base::UTF8ToUTF16(device.display_name));
+    default:
+      return base::UTF8ToUTF16(device.display_name);
+  }
+}
+
+}  // namespace
+
+using chromeos::CrasAudioHandler;
+
+namespace ash {
+namespace internal {
+namespace tray {
+
+AudioDetailedView::AudioDetailedView(SystemTrayItem* owner,
+                                     user::LoginStatus login)
+    : TrayDetailsView(owner),
+      login_(login) {
+  CreateItems();
+  Update();
+}
+
+AudioDetailedView::~AudioDetailedView() {
+}
+
+void AudioDetailedView::Update() {
+  UpdateAudioDevices();
+  Layout();
+}
+
+void AudioDetailedView::AddScrollListInfoItem(const base::string16& text) {
+  views::Label* label = new views::Label(
+      text,
+      ui::ResourceBundle::GetSharedInstance().GetFontList(
+          ui::ResourceBundle::BoldFont));
+
+  //  Align info item with checkbox items
+  int margin = kTrayPopupPaddingHorizontal +
+      kTrayPopupDetailsLabelExtraLeftMargin;
+  int left_margin = 0;
+  int right_margin = 0;
+  if (base::i18n::IsRTL())
+    right_margin = margin;
+  else
+    left_margin = margin;
+
+  label->SetBorder(views::Border::CreateEmptyBorder(
+      ash::kTrayPopupPaddingBetweenItems,
+      left_margin,
+      ash::kTrayPopupPaddingBetweenItems,
+      right_margin));
+  label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  label->SetEnabledColor(SkColorSetARGB(192, 0, 0, 0));
+
+  scroll_content()->AddChildView(label);
+}
+
+HoverHighlightView* AudioDetailedView::AddScrollListItem(
+    const base::string16& text,
+    gfx::Font::FontStyle style,
+    bool checked) {
+  HoverHighlightView* container = new HoverHighlightView(this);
+  container->AddCheckableLabel(text, style, checked);
+  scroll_content()->AddChildView(container);
+  return container;
+}
+
+void AudioDetailedView::CreateHeaderEntry() {
+  CreateSpecialRow(IDS_ASH_STATUS_TRAY_AUDIO, this);
+}
+
+void AudioDetailedView::CreateItems() {
+  CreateScrollableList();
+  CreateHeaderEntry();
+}
+
+void AudioDetailedView::UpdateAudioDevices() {
+  output_devices_.clear();
+  input_devices_.clear();
+  chromeos::AudioDeviceList devices;
+  CrasAudioHandler::Get()->GetAudioDevices(&devices);
+  for (size_t i = 0; i < devices.size(); ++i) {
+    if (devices[i].is_input)
+      input_devices_.push_back(devices[i]);
+    else
+      output_devices_.push_back(devices[i]);
+  }
+  UpdateScrollableList();
+}
+
+void AudioDetailedView::UpdateScrollableList() {
+  scroll_content()->RemoveAllChildViews(true);
+  device_map_.clear();
+
+  // Add audio output devices.
+  AddScrollListInfoItem(
+      l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_AUDIO_OUTPUT));
+  for (size_t i = 0; i < output_devices_.size(); ++i) {
+    HoverHighlightView* container = AddScrollListItem(
+        GetAudioDeviceName(output_devices_[i]),
+        gfx::Font::NORMAL,
+        output_devices_[i].active);  /* checkmark if active */
+    device_map_[container] = output_devices_[i];
+  }
+
+  AddScrollSeparator();
+
+  // Add audio input devices.
+  AddScrollListInfoItem(
+      l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_AUDIO_INPUT));
+  for (size_t i = 0; i < input_devices_.size(); ++i) {
+    HoverHighlightView* container = AddScrollListItem(
+        GetAudioDeviceName(input_devices_[i]),
+        gfx::Font::NORMAL,
+        input_devices_[i].active);  /* checkmark if active */
+    device_map_[container] = input_devices_[i];
+  }
+
+  scroll_content()->SizeToPreferredSize();
+  scroller()->Layout();
+}
+
+void AudioDetailedView::OnViewClicked(views::View* sender) {
+  if (sender == footer()->content()) {
+    TransitionToDefaultView();
+  } else {
+    AudioDeviceMap::iterator iter = device_map_.find(sender);
+    if (iter == device_map_.end())
+      return;
+    chromeos::AudioDevice& device = iter->second;
+    CrasAudioHandler::Get()->SwitchToDevice(device);
+  }
+}
+
+}  // namespace tray
+}  // namespace internal
+}  // namespace ash