Power overlay in Settings.

chrome/browser/ui/webui/options/chromeos/power_handler.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 "chrome/browser/ui/webui/options/chromeos/power_handler.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/grit/generated_resources.h"
+#include "content/public/browser/web_ui.h"
+#include "grit/ash_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/base/webui/web_ui_util.h"
+#include "ui/gfx/image/image_skia.h"
+
+using ash::PowerStatus;
+
+namespace chromeos {
+namespace options {
+
+PowerHandler::PowerHandler() {
+}
+
+PowerHandler::~PowerHandler() {
+  if (switches::PowerOverlayEnabled())
+    PowerStatus::Get()->RemoveObserver(this);
+}
+
+void PowerHandler::GetLocalizedValues(
+    base::DictionaryValue* localized_strings) {
+  DCHECK(localized_strings);
+  RegisterTitle(localized_strings, "powerOverlay",
+                IDS_OPTIONS_POWER_OVERLAY_TITLE);
+  localized_strings->SetString(
+      "batteryStatusLabel",
+      l10n_util::GetStringUTF16(IDS_OPTIONS_BATTERY_STATUS_LABEL));
+}
+
+void PowerHandler::InitializePage() {
+  if (switches::PowerOverlayEnabled())
+    PowerStatus::Get()->RequestStatusUpdate();
+}
+
+void PowerHandler::RegisterMessages() {
+  if (switches::PowerOverlayEnabled())
+    PowerStatus::Get()->AddObserver(this);
+
+  // Callback to fetch the battery icon data.
+  web_ui()->RegisterMessageCallback(
+      "requestBatteryIcon",
+      base::Bind(&PowerHandler::GetBatteryIcon, base::Unretained(this)));
+}
+
+void PowerHandler::OnPowerStatusChanged() {
+  web_ui()->CallJavascriptFunction(
+      "options.PowerOverlay.setBatteryStatusText",
+      base::StringValue(GetStatusValue()));
+  web_ui()->CallJavascriptFunction(
+      "options.BrowserOptions.setBatteryStatusText",
+      base::StringValue(GetFullStatusText()));
+}
+
+base::string16 PowerHandler::GetStatusValue() const {
+  PowerStatus* status = PowerStatus::Get();
+  if (!status->IsBatteryPresent())
+    return base::string16();
+
+  bool charging = status->IsBatteryCharging();
+  bool calculating = status->IsBatteryTimeBeingCalculated();
+  int percent = status->GetRoundedBatteryPercent();
+  base::TimeDelta time_left;
+  bool show_time = false;
+
+  if (!calculating) {
+    time_left = charging ? status->GetBatteryTimeToFull() :
+                           status->GetBatteryTimeToEmpty();
+    show_time = PowerStatus::ShouldDisplayBatteryTime(time_left);
+  }
+
+  if (!show_time) {
+    return l10n_util::GetStringFUTF16(IDS_OPTIONS_BATTERY_STATUS_SHORT,
+                                      base::IntToString16(percent));
+  } else {
+    int hour = 0;
+    int min = 0;
+    PowerStatus::SplitTimeIntoHoursAndMinutes(time_left, &hour, &min);
+    base::string16 minute_text = base::ASCIIToUTF16(min < 10 ? "0" : "") +
+                                 base::IntToString16(min);
+    return l10n_util::GetStringFUTF16(
+        charging ? IDS_OPTIONS_BATTERY_STATUS_CHARGING :
+                   IDS_OPTIONS_BATTERY_STATUS,
+        base::IntToString16(percent),
+        base::IntToString16(hour),
+        minute_text);
+  }
+}
+
+base::string16 PowerHandler::GetFullStatusText() const {
+  base::string16 status = GetStatusValue();
+  if (status.empty())
+    return base::string16();
+  return l10n_util::GetStringFUTF16(
+      IDS_OPTIONS_DEVICE_GROUP_BATTERY_STATUS_LABEL, status);
+}
+
+void PowerHandler::GetBatteryIcon(const base::ListValue* args) {
+  gfx::ImageSkia icon = PowerStatus::Get()->GetBatteryImage(
+      ash::PowerStatus::ICON_DARK);
+  gfx::ImageSkiaRep image_rep = icon.GetRepresentation(
+      web_ui()->GetDeviceScaleFactor());
+  web_ui()->CallJavascriptFunction(
+      "options.BrowserOptions.setBatteryIcon",
+      base::StringValue(webui::GetBitmapDataUrl(image_rep.sk_bitmap())));
+}
+
+}  // namespace options
+}  // namespace chromeos