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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "content/browser/battery_status/battery_status_manager.h" | |
6 | |
7 #include "base/memory/ref_counted.h" | |
8 #include "base/memory/weak_ptr.h" | |
timvolodine
2014/07/14 17:38:56
is this still needed?
sadrul
2014/07/14 17:46:31
Nope. Removed.
| |
9 #include "chromeos/dbus/dbus_thread_manager.h" | |
10 #include "chromeos/dbus/power_manager/power_supply_properties.pb.h" | |
11 #include "chromeos/dbus/power_manager_client.h" | |
12 #include "content/public/browser/browser_thread.h" | |
13 #include "third_party/WebKit/public/platform/WebBatteryStatus.h" | |
14 | |
15 namespace content { | |
16 | |
17 namespace { | |
18 | |
19 class PowerManagerObserver | |
20 : public chromeos::PowerManagerClient::Observer, | |
21 public base::RefCountedThreadSafe<PowerManagerObserver> { | |
22 public: | |
23 explicit PowerManagerObserver( | |
24 const BatteryStatusService::BatteryUpdateCallback& callback) | |
25 : callback_(callback), currently_listening_(false) {} | |
26 | |
27 // Starts listening for updates. It is safe to call this on any thread. | |
28 void Start() { | |
29 if (BrowserThread::CurrentlyOn(BrowserThread::UI)) { | |
30 StartOnUI(); | |
31 } else { | |
32 BrowserThread::PostTask( | |
33 BrowserThread::UI, | |
34 FROM_HERE, | |
35 base::Bind(&PowerManagerObserver::StartOnUI, this)); | |
36 } | |
37 } | |
38 | |
39 // Stops listening for updates. It is safe to call this on any thread. | |
40 void Stop() { | |
41 if (BrowserThread::CurrentlyOn(BrowserThread::UI)) { | |
42 StopOnUI(); | |
43 } else { | |
44 BrowserThread::PostTask( | |
45 BrowserThread::UI, | |
46 FROM_HERE, | |
47 base::Bind(&PowerManagerObserver::StopOnUI, this)); | |
48 } | |
49 } | |
50 | |
51 private: | |
52 friend class base::RefCountedThreadSafe<PowerManagerObserver>; | |
53 | |
54 virtual ~PowerManagerObserver() {} | |
55 | |
56 bool IsBatteryPresent( | |
57 const power_manager::PowerSupplyProperties& proto) const { | |
58 return proto.battery_state() != | |
59 power_manager::PowerSupplyProperties_BatteryState_NOT_PRESENT; | |
60 } | |
61 | |
62 bool IsUsbChargerConnected( | |
63 const power_manager::PowerSupplyProperties& proto) const { | |
64 return proto.external_power() == | |
65 power_manager::PowerSupplyProperties_ExternalPower_USB; | |
66 } | |
67 | |
68 bool IsBatteryCharging( | |
69 const power_manager::PowerSupplyProperties& proto) const { | |
70 return proto.battery_state() != | |
71 power_manager::PowerSupplyProperties_BatteryState_DISCHARGING; | |
72 } | |
73 | |
74 bool IsBatteryFull(const power_manager::PowerSupplyProperties& proto) const { | |
75 return proto.battery_state() == | |
76 power_manager::PowerSupplyProperties_BatteryState_FULL; | |
77 } | |
78 | |
79 double GetBatteryLevel( | |
80 const power_manager::PowerSupplyProperties& proto) const { | |
81 const double kMaxBatteryLevelProto = 100.f; | |
82 return proto.battery_percent() / kMaxBatteryLevelProto; | |
83 } | |
84 | |
85 void StartOnUI() { | |
86 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | |
87 if (currently_listening_) | |
88 return; | |
89 chromeos::PowerManagerClient* power_client = | |
90 chromeos::DBusThreadManager::Get()->GetPowerManagerClient(); | |
91 power_client->AddObserver(this); | |
92 power_client->RequestStatusUpdate(); | |
93 currently_listening_ = true; | |
94 } | |
95 | |
96 void StopOnUI() { | |
97 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | |
98 if (!currently_listening_) | |
99 return; | |
100 chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver( | |
101 this); | |
102 currently_listening_ = false; | |
103 } | |
104 | |
105 // chromeos::PowerManagerClient::Observer: | |
106 virtual void PowerChanged( | |
107 const power_manager::PowerSupplyProperties& proto) OVERRIDE { | |
108 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | |
109 blink::WebBatteryStatus status; | |
110 // Use the default values if there is no battery in the system. | |
111 if (IsBatteryPresent(proto)) { | |
112 // The charging status is unreliable if a low power charger is connected | |
113 // (i.e. usb). | |
114 bool status_unreliable = IsUsbChargerConnected(proto); | |
115 // Battery time is unreliable if it is still being computed. | |
116 bool time_unreliable = | |
117 status_unreliable || proto.is_calculating_battery_time(); | |
118 | |
119 // Set |charging| only if the status is reliable. Otherwise, keep the | |
120 // default (which is |true|). | |
121 if (!status_unreliable) | |
122 status.charging = IsBatteryCharging(proto); | |
123 | |
124 // Set |chargingTime| to +infinity if the battery is discharging, or if | |
125 // the time is unreliable. Keep the default value (which is 0) if the | |
126 // battery is full. | |
127 if (time_unreliable || !status.charging) | |
128 status.chargingTime = std::numeric_limits<double>::infinity(); | |
129 else if (!IsBatteryFull(proto)) | |
130 status.chargingTime = proto.battery_time_to_full_sec(); | |
131 | |
132 // Keep the default value for |dischargingTime| (which is +infinity) if | |
133 // the time is unreliable, or if the battery is charging. | |
134 if (!time_unreliable && !status.charging) | |
135 status.dischargingTime = proto.battery_time_to_empty_sec(); | |
136 | |
137 status.level = GetBatteryLevel(proto); | |
138 } | |
139 callback_.Run(status); | |
140 } | |
141 | |
142 BatteryStatusService::BatteryUpdateCallback callback_; | |
143 bool currently_listening_; | |
144 | |
145 DISALLOW_COPY_AND_ASSIGN(PowerManagerObserver); | |
146 }; | |
147 | |
148 class BatteryStatusManagerChromeOS | |
149 : public BatteryStatusManager, | |
150 public chromeos::PowerManagerClient::Observer { | |
151 public: | |
152 explicit BatteryStatusManagerChromeOS( | |
153 const BatteryStatusService::BatteryUpdateCallback& callback) | |
154 : observer_(new PowerManagerObserver(callback)) {} | |
155 | |
156 virtual ~BatteryStatusManagerChromeOS() { observer_->Stop(); } | |
157 | |
158 private: | |
159 // BatteryStatusManager: | |
160 virtual bool StartListeningBatteryChange() OVERRIDE { | |
161 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); | |
162 observer_->Start(); | |
163 return true; | |
164 } | |
165 | |
166 virtual void StopListeningBatteryChange() OVERRIDE { | |
167 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); | |
168 observer_->Stop(); | |
169 } | |
170 | |
171 scoped_refptr<PowerManagerObserver> observer_; | |
172 | |
173 DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerChromeOS); | |
174 }; | |
175 | |
176 } // namespace | |
177 | |
178 // static | |
179 scoped_ptr<BatteryStatusManager> BatteryStatusManager::Create( | |
180 const BatteryStatusService::BatteryUpdateCallback& callback) { | |
181 return scoped_ptr<BatteryStatusManager>( | |
182 new BatteryStatusManagerChromeOS(callback)); | |
183 } | |
184 | |
185 } // namespace content | |
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