Introducing ResumeLibrary to track system resume signal

chrome/browser/chromeos/status/clock_menu_button.cc

 // Copyright (c) 2010 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/chromeos/status/clock_menu_button.h"
 
 #include "base/i18n/time_formatting.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
@@ skipping 15 matching lines @@
 const int kFontSizeDelta = 0;
 #else
 const int kFontSizeDelta = 1;
 #endif
 
 ClockMenuButton::ClockMenuButton(StatusAreaHost* host)
     : StatusAreaButton(this),
       host_(host) {
   // Add as SystemLibrary observer. We update the clock if timezone changes.
   CrosLibrary::Get()->GetSystemLibrary()->AddObserver(this);
+  CrosLibrary::Get()->GetPowerLibrary()->AddObserver(this);
 
   set_border(NULL);
   set_use_menu_button_paint(true);
   SetFont(ResourceBundle::GetSharedInstance().GetFont(
       ResourceBundle::BaseFont).DeriveFont(kFontSizeDelta));
   SetEnabledColor(0xB3FFFFFF);  // White with 70% Alpha
   SetShowMultipleIconStates(false);
   set_alignment(TextButton::ALIGN_CENTER);
   UpdateTextAndSetNextTimer();
 }
 
 ClockMenuButton::~ClockMenuButton() {
+  CrosLibrary::Get()->GetPowerLibrary()->RemoveObserver(this);
   CrosLibrary::Get()->GetSystemLibrary()->RemoveObserver(this);
 }
 
 void ClockMenuButton::UpdateTextAndSetNextTimer() {
   UpdateText();
 
   // Try to set the timer to go off at the next change of the minute. We don't
   // want to have the timer go off more than necessary since that will cause
   // the CPU to wake up and consume power.
   base::Time now = base::Time::Now();
@@ skipping 46 matching lines @@
 bool ClockMenuButton::IsEnabledAt(int index) const {
   // The 1st item is the current date, which is disabled.
   return index != 0;
 }
 
 void ClockMenuButton::ActivatedAt(int index) {
   host_->OpenButtonOptions(this);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
+// ClockMenuButton, PowerLibrary::Observer implementation:
+
+void ClockMenuButton::SystemResumed() {
+  UpdateText();
+}
+
+///////////////////////////////////////////////////////////////////////////////
 // ClockMenuButton, SystemLibrary::Observer implementation:
 
 void ClockMenuButton::TimezoneChanged(const icu::TimeZone& timezone) {
   UpdateText();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ClockMenuButton, views::ViewMenuDelegate implementation:
 
 void ClockMenuButton::RunMenu(views::View* source, const gfx::Point& pt) {
   if (!clock_menu_.get())
     clock_menu_.reset(new views::Menu2(this));
   else
     clock_menu_->Rebuild();
   clock_menu_->UpdateStates();
   clock_menu_->RunMenuAt(pt, views::Menu2::ALIGN_TOPRIGHT);
 }
 
 }  // namespace chromeos