chromeos: Simplify power supply info in PowerLibrary

chrome/browser/chromeos/cros/power_library.cc

 // Copyright (c) 2011 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/cros/power_library.h"
 
+#include <algorithm>
+
+#include "base/basictypes.h"
 #include "base/bind.h"
-#include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/observer_list.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "content/browser/browser_thread.h"
 #include "third_party/cros/chromeos_power.h"
 #include "third_party/cros/chromeos_resume.h"
 
 namespace chromeos {
 
 class PowerLibraryImpl : public PowerLibrary {
  public:
   PowerLibraryImpl()
       : power_status_connection_(NULL),
-        resume_status_connection_(NULL),
-        status_(chromeos::PowerStatus()) {
+        resume_status_connection_(NULL) {
   }
 
   virtual ~PowerLibraryImpl() {
     if (power_status_connection_) {
       chromeos::DisconnectPowerStatus(power_status_connection_);
       power_status_connection_ = NULL;
     }
     if (resume_status_connection_) {
       chromeos::DisconnectResume(resume_status_connection_);
       resume_status_connection_ = NULL;
@@ skipping 10 matching lines @@
   }
 
   virtual void AddObserver(Observer* observer) OVERRIDE {
     observers_.AddObserver(observer);
   }
 
   virtual void RemoveObserver(Observer* observer) OVERRIDE {
     observers_.RemoveObserver(observer);
   }
 
-  virtual bool IsLinePowerOn() const OVERRIDE {
-    return status_.line_power_on;
-  }
-
-  virtual bool IsBatteryFullyCharged() const OVERRIDE {
-    return status_.battery_state == chromeos::BATTERY_STATE_FULLY_CHARGED;
-  }
-
-  virtual double GetBatteryPercentage() const OVERRIDE {
-    return status_.battery_percentage;
-  }
-
-  virtual bool IsBatteryPresent() const OVERRIDE {
-    return status_.battery_is_present;
-  }
-
-  virtual base::TimeDelta GetBatteryTimeToEmpty() const OVERRIDE {
-    return base::TimeDelta::FromSeconds(status_.battery_time_to_empty);
-  }
-
-  virtual base::TimeDelta GetBatteryTimeToFull() const OVERRIDE {
-    return base::TimeDelta::FromSeconds(status_.battery_time_to_full);
-  }
-
   virtual void CalculateIdleTime(CalculateIdleTimeCallback* callback) OVERRIDE {
     // TODO(sidor): Examine if it's really a good idea to use void* as a second
     // argument.
     chromeos::GetIdleTime(&GetIdleTimeCallback, callback);
   }
 
   virtual void EnableScreenLock(bool enable) OVERRIDE {
     // Called when the screen preference is changed, which should always
     // run on UI thread.
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ skipping 33 matching lines @@
         static_cast<CalculateIdleTimeCallback*>(object);
     if (success) {
       notify->Run(time_idle_ms/1000);
     } else {
       LOG(ERROR) << "Power manager failed to calculate idle time.";
       notify->Run(-1);
     }
     delete notify;
   }
 
-  static void PowerStatusChangedHandler(void* object,
-                                        const chromeos::PowerStatus& status) {
+  static void PowerStatusChangedHandler(
+      void* object, const chromeos::PowerStatus& power_status) {
+    // TODO(sque): this is a temporary copy-over from libcros.  Soon libcros
+    // will be removed and this will not be necessary.
+    PowerSupplyStatus status = {};
+    status.line_power_on         = power_status.line_power_on;
+    status.battery_is_present    = power_status.battery_is_present;
+    status.battery_is_full       =
+        (power_status.battery_state == chromeos::BATTERY_STATE_FULLY_CHARGED);
+    status.battery_seconds_to_empty = power_status.battery_time_to_empty;
+    status.battery_seconds_to_full  = power_status.battery_time_to_full;
+    status.battery_percentage    = power_status.battery_percentage;
+
     PowerLibraryImpl* power = static_cast<PowerLibraryImpl*>(object);
     power->UpdatePowerStatus(status);
   }
 
   static void SystemResumedHandler(void* object) {
     PowerLibraryImpl* power = static_cast<PowerLibraryImpl*>(object);
     power->SystemResumed();
   }
 
-  void UpdatePowerStatus(const chromeos::PowerStatus& status) {
+  void UpdatePowerStatus(const PowerSupplyStatus& status) {
     // Called from PowerStatusChangedHandler, a libcros callback which
     // should always run on UI thread.
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
-    DVLOG(1) << "Power lpo=" << status.line_power_on
-             << " sta=" << status.battery_state
-             << " per=" << status.battery_percentage
-             << " tte=" << status.battery_time_to_empty
-             << " ttf=" << status.battery_time_to_full;
-    status_ = status;
-    FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(this));
+    DVLOG(1) << "Power line_power_on = " << status.line_power_on
+             << " percentage = " << status.battery_percentage
+             << " seconds_to_empty = " << status.battery_seconds_to_empty
+             << " seconds_to_full = " << status.battery_seconds_to_full;
+    FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(status));
   }
 
   void SystemResumed() {
     // Called from SystemResumedHandler, a libcros callback which should
     // always run on UI thread.
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     FOR_EACH_OBSERVER(Observer, observers_, SystemResumed());
   }
 
   ObserverList<Observer> observers_;
 
   // A reference to the power battery API, to allow callbacks when the battery
   // status changes.
   chromeos::PowerStatusConnection power_status_connection_;
 
   // A reference to the resume alerts.
   chromeos::ResumeConnection resume_status_connection_;
 
-  // The latest power status.
-  chromeos::PowerStatus status_;
-
   DISALLOW_COPY_AND_ASSIGN(PowerLibraryImpl);
 };
 
 // The stub implementation runs the battery up and down, pausing at the
 // fully charged and fully depleted states.
 class PowerLibraryStubImpl : public PowerLibrary {
  public:
   PowerLibraryStubImpl()
       : discharging_(true),
         battery_percentage_(80),
         pause_count_(0) {
   }
 
   virtual ~PowerLibraryStubImpl() {}
 
   // Begin PowerLibrary implementation.
   virtual void Init() OVERRIDE {}
   virtual void AddObserver(Observer* observer) OVERRIDE {
     observers_.AddObserver(observer);
   }
 
   virtual void RemoveObserver(Observer* observer) OVERRIDE {
     observers_.RemoveObserver(observer);
   }
 
-  virtual bool IsLinePowerOn() const OVERRIDE {
-    return !discharging_;
-  }
-
-  virtual bool IsBatteryFullyCharged() const OVERRIDE {
-    return battery_percentage_ == 100;
-  }
-
-  virtual double GetBatteryPercentage() const OVERRIDE {
-    return battery_percentage_;
-  }
-
-  virtual bool IsBatteryPresent() const OVERRIDE {
-    return true;
-  }
-
-  virtual base::TimeDelta GetBatteryTimeToEmpty() const OVERRIDE {
-    if (battery_percentage_ == 0)
-      return base::TimeDelta::FromSeconds(1);
-    else
-      return (base::TimeDelta::FromHours(3) * battery_percentage_) / 100;
-  }
-
-  virtual base::TimeDelta GetBatteryTimeToFull() const OVERRIDE {
-    if (battery_percentage_ == 100)
-      return base::TimeDelta::FromSeconds(1);
-    else
-      return base::TimeDelta::FromHours(3) - GetBatteryTimeToEmpty();
-  }
-
   virtual void CalculateIdleTime(CalculateIdleTimeCallback* callback) OVERRIDE {
     callback->Run(0);
     delete callback;
   }
 
   virtual void EnableScreenLock(bool enable) OVERRIDE {}
 
   virtual void RequestRestart() OVERRIDE {}
 
   virtual void RequestShutdown() OVERRIDE {}
@@ skipping 23 matching lines @@
     if (battery_percentage_ == 0 || battery_percentage_ == 100) {
       if (pause_count_) {
         pause_count_ = 0;
         discharging_ = !discharging_;
       } else {
         pause_count_ = 20;
         return;
       }
     }
     battery_percentage_ += (discharging_ ? -1 : 1);
-    FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(this));
+
+    PowerSupplyStatus status = {};  // Zero-clear the status.
+    status.line_power_on = !discharging_;
+    status.battery_is_present = true;
+    status.battery_percentage = battery_percentage_;
+    status.battery_seconds_to_empty =
+        std::max(1, battery_percentage_ * 180 / 100);
+    status.battery_seconds_to_full =
+        std::max(static_cast<int64>(1), 180 - status.battery_seconds_to_empty);
+
+    FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(status));
   }
 
   bool discharging_;
   int battery_percentage_;
   int pause_count_;
   ObserverList<Observer> observers_;
   base::RepeatingTimer<PowerLibraryStubImpl> timer_;
 };
 
 // static
 PowerLibrary* PowerLibrary::GetImpl(bool stub) {
   PowerLibrary* impl;
   if (stub)
     impl = new PowerLibraryStubImpl();
   else
     impl = new PowerLibraryImpl();
   impl->Init();
   return impl;
 }
 
 }  // namespace chromeos