Add Bluetooth device type icons on the device list in system tray.

ash/system/chromeos/bluetooth/tray_bluetooth.cc

Index: ash/system/chromeos/bluetooth/tray_bluetooth.cc
diff --git a/ash/system/chromeos/bluetooth/tray_bluetooth.cc b/ash/system/chromeos/bluetooth/tray_bluetooth.cc
index c4e145265322fb3d7c1f268a58f72a61176114be..f1afbe1e744df4e7a51f7241a5619c59286ff86a 100644
--- a/ash/system/chromeos/bluetooth/tray_bluetooth.cc
+++ b/ash/system/chromeos/bluetooth/tray_bluetooth.cc
@@ -6,6 +6,7 @@
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
+#include "ash/system/tray/fixed_sized_image_view.h"
 #include "ash/system/tray/fixed_sized_scroll_view.h"
 #include "ash/system/tray/hover_highlight_view.h"
 #include "ash/system/tray/system_tray.h"
@@ -24,11 +25,19 @@
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/layout/box_layout.h"
+#include "ui/views/layout/fill_layout.h"
 
 namespace ash {
 namespace tray {
 namespace {
 
+// Constants of special layout for bluetooth device entries.
+const int kDeviceLabelLeftMargin = 7;
+const int kDeviceTypeIconAreaWidth = 60;
+const int kConnectedIconSize = 10;
+const int kConnectedIconOffsetTop = 26;
+const int kConnectedIconOffsetLeft = 33;
+
 // Updates bluetooth device |device| in the |list|. If it is new, append to the
 // end of the |list|; otherwise, keep it at the same place, but update the data
 // with new device info provided by |device|.
@@ -60,6 +69,94 @@ void RemoveObsoleteBluetoothDevicesFromList(
   }
 }
 
+// Returns a resource id of an icon which corresponds to the given device type.
+int GetDeviceIconResourceId(device::BluetoothDevice::DeviceType device_type) {
+  switch (device_type) {
+    case device::BluetoothDevice::DEVICE_COMPUTER:
+      return IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_COMPUTER;
+    case device::BluetoothDevice::DEVICE_PHONE:
+      return IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_SMARTPHONE;
+    case device::BluetoothDevice::DEVICE_AUDIO:
+    case device::BluetoothDevice::DEVICE_CAR_AUDIO:
+      return IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_HEADSET;
+    case device::BluetoothDevice::DEVICE_VIDEO:
+      return IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_VIDEOCAM;
+    case device::BluetoothDevice::DEVICE_JOYSTICK:
+    case device::BluetoothDevice::DEVICE_GAMEPAD:
+      return IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_GAMEPAD;
+    case device::BluetoothDevice::DEVICE_KEYBOARD:
+    case device::BluetoothDevice::DEVICE_KEYBOARD_MOUSE_COMBO:
+      return IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_KEYBOARD;
+    case device::BluetoothDevice::DEVICE_TABLET:
+    case device::BluetoothDevice::DEVICE_MOUSE:
+      return IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_MOUSE;
+    default:
+      return IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_BLUETOOTH;
+  }
+}
+
+// Special layout for bluetooth device entries.
+class BluetoothDeviceListEntry : public HoverHighlightView {
+ public:
+  BluetoothDeviceListEntry(ViewClickListener* listener,
+                           const gfx::ImageSkia& image,
+                           const base::string16& text,
+                           bool highlight,
+                           bool checked,
+                           bool enabled)
+      : HoverHighlightView(listener), device_icon_(nullptr) {
+    SetEnabled(enabled);
+
+    AddDeviceTypeIcon(image);
+    AddDeviceLabel(text, highlight);
+    if (checked)
+      AddCheckmarkOnDeviceIcon();
+
+    // Overwrites the layout mode which was set as FillLayout by AddLabel().
+    SetLayoutManager(
+        new views::BoxLayout(views::BoxLayout::kHorizontal, 0, 0, 0));
+  }
+
+ private:
+  views::ImageView* device_icon_;
+
+  void AddDeviceTypeIcon(const gfx::ImageSkia& image) {
+    device_icon_ = new FixedSizedImageView(kDeviceTypeIconAreaWidth, 0);
+    device_icon_->SetImage(image);
+    device_icon_->SetEnabled(enabled());
+    AddChildView(device_icon_);
+  }
+
+  void AddDeviceLabel(const base::string16& text, bool highlight) {
+    AddLabel(text, gfx::ALIGN_LEFT, highlight);
+    int left_margin = kDeviceLabelLeftMargin;
+    int right_margin = kTrayPopupPaddingHorizontal;
+    if (base::i18n::IsRTL())
+      std::swap(left_margin, right_margin);
+    text_label()->SetBorder(
+        views::Border::CreateEmptyBorder(5, left_margin, 5, right_margin));
+  }
+
+  void AddCheckmarkOnDeviceIcon() {
+    device_icon_->SetLayoutManager(new views::FillLayout());
+    ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+    const gfx::ImageSkia* checkmark =
+        rb.GetImageNamed(IDR_AURA_UBER_TRAY_BLUETOOTH_DEVICE_CONNECTED)
+            .ToImageSkia();
+    views::ImageView* checkmark_view =
+        new FixedSizedImageView(kConnectedIconSize, kConnectedIconSize);
+    checkmark_view->SetImage(checkmark);
+    checkmark_view->SetEnabled(enabled());
+    checkmark_view->SetHorizontalAlignment(views::ImageView::LEADING);
+    checkmark_view->SetVerticalAlignment(views::ImageView::LEADING);
+    checkmark_view->SetBorder(views::Border::CreateEmptyBorder(
+        kConnectedIconOffsetTop, kConnectedIconOffsetLeft, 0,
+        kDeviceTypeIconAreaWidth - kConnectedIconOffsetLeft -
+            kConnectedIconSize));
+    device_icon_->AddChildView(checkmark_view);
+  }
+};
+
 }  // namespace
 
 class BluetoothDefaultView : public TrayItemMore {
@@ -271,9 +368,12 @@ class BluetoothDetailedView : public TrayDetailsView,
                                          bool highlight,
                                          bool checked,
                                          bool enabled) {
+    ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
     for (size_t i = 0; i < list.size(); ++i) {
-      HoverHighlightView* container =
-          AddScrollListItem(list[i].display_name, highlight, checked, enabled);
+      const gfx::ImageSkia* icon =
+          rb.GetImageSkiaNamed(GetDeviceIconResourceId(list[i].device_type));
+      HoverHighlightView* container = AddBluetoothDeviceListEntry(
+          list[i].display_name, icon, highlight, checked, enabled);
       device_map_[container] = list[i].address;
     }
   }
@@ -290,6 +390,18 @@ class BluetoothDetailedView : public TrayDetailsView,
     return container;
   }
 
+  // Add an bluetooth device entry to the scrollable device list.
+  HoverHighlightView* AddBluetoothDeviceListEntry(const base::string16& text,
+                                                  const gfx::ImageSkia* icon,
+                                                  bool highlight,
+                                                  bool checked,
+                                                  bool enabled) {
+    BluetoothDeviceListEntry* container = new BluetoothDeviceListEntry(
+        this, *icon, text, highlight, checked, enabled);
+    scroll_content()->AddChildView(container);
+    return container;
+  }
+
   // Add settings entries.
   void AppendSettingsEntries() {
     if (!ash::Shell::GetInstance()