Chromium Code Reviews Chromium Code Reviews
Issue 22674006:
Delete the Windows 7 Geolocation provider. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master| OLD | NEW |
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| 1 // Copyright (c) 2012 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/geolocation/win7_location_provider_win.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 #include <cmath> | |
| 9 | |
| 10 #include "base/bind.h" | |
| 11 #include "base/compiler_specific.h" | |
| 12 #include "base/logging.h" | |
| 13 #include "base/message_loop/message_loop.h" | |
| 14 | |
| 15 namespace content { | |
| 16 namespace { | |
| 17 | |
| 18 const int kPollPeriodMovingMillis = 500; | |
| 19 // Poll less frequently whilst stationary. | |
| 20 const int kPollPeriodStationaryMillis = kPollPeriodMovingMillis * 3; | |
| 21 // Reading must differ by more than this amount to be considered movement. | |
| 22 const int kMovementThresholdMeters = 20; | |
| 23 | |
| 24 // This algorithm is reused from the corresponding code in the Gears project | |
| 25 // and is also used in gps_location_provider_linux.cc | |
| 26 // The arbitrary delta is decreased (Gears used 100 meters); if we need to | |
| 27 // decrease it any further we'll likely want to do some smarter filtering to | |
| 28 // remove GPS location jitter noise. | |
| 29 bool PositionsDifferSiginificantly(const Geoposition& position_1, | |
| 30 const Geoposition& position_2) { | |
| 31 const bool pos_1_valid = position_1.Validate(); | |
| 32 if (pos_1_valid != position_2.Validate()) | |
| 33 return true; | |
| 34 if (!pos_1_valid) { | |
| 35 DCHECK(!position_2.Validate()); | |
| 36 return false; | |
| 37 } | |
| 38 double delta = std::sqrt( | |
| 39 std::pow(std::fabs(position_1.latitude - position_2.latitude), 2) + | |
| 40 std::pow(std::fabs(position_1.longitude - position_2.longitude), 2)); | |
| 41 // Convert to meters. 1 minute of arc of latitude (or longitude at the | |
| 42 // equator) is 1 nautical mile or 1852m. | |
| 43 delta *= 60 * 1852; | |
| 44 return delta > kMovementThresholdMeters; | |
| 45 } | |
| 46 } | |
| 47 | |
| 48 Win7LocationProvider::Win7LocationProvider(Win7LocationApi* api) | |
| 49 : weak_factory_(this) { | |
| 50 DCHECK(api != NULL); | |
| 51 api_.reset(api); | |
| 52 } | |
| 53 | |
| 54 Win7LocationProvider::~Win7LocationProvider() { | |
| 55 api_.reset(); | |
| 56 } | |
| 57 | |
| 58 bool Win7LocationProvider::StartProvider(bool high_accuracy){ | |
| 59 if (api_ == NULL) | |
| 60 return false; | |
| 61 api_->SetHighAccuracy(high_accuracy); | |
| 62 if (!weak_factory_.HasWeakPtrs()) | |
| 63 ScheduleNextPoll(0); | |
| 64 return true; | |
| 65 } | |
| 66 | |
| 67 void Win7LocationProvider::StopProvider() { | |
| 68 weak_factory_.InvalidateWeakPtrs(); | |
| 69 } | |
| 70 | |
| 71 void Win7LocationProvider::GetPosition(Geoposition* position) { | |
| 72 DCHECK(position); | |
| 73 *position = position_; | |
| 74 } | |
| 75 | |
| 76 void Win7LocationProvider::RequestRefresh() { | |
| 77 ScheduleNextPoll(0); | |
| 78 } | |
| 79 | |
| 80 void Win7LocationProvider::OnPermissionGranted() { | |
| 81 } | |
| 82 | |
| 83 void Win7LocationProvider::DoPollTask() { | |
| 84 Geoposition new_position; | |
| 85 api_->GetPosition(&new_position); | |
| 86 const bool differ = PositionsDifferSiginificantly(position_, new_position); | |
| 87 ScheduleNextPoll(differ ? kPollPeriodMovingMillis : | |
| 88 kPollPeriodStationaryMillis); | |
| 89 if (differ || new_position.error_code != Geoposition::ERROR_CODE_NONE) { | |
| 90 // Update if the new location is interesting or we have an error to report | |
| 91 position_ = new_position; | |
| 92 NotifyCallback(position_); | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 void Win7LocationProvider::ScheduleNextPoll(int interval) { | |
| 97 base::MessageLoop::current()->PostDelayedTask( | |
| 98 FROM_HERE, | |
| 99 base::Bind(&Win7LocationProvider::DoPollTask, weak_factory_.GetWeakPtr()), | |
| 100 base::TimeDelta::FromMilliseconds(interval)); | |
| 101 } | |
| 102 | |
| 103 LocationProvider* NewSystemLocationProvider() { | |
|
bulach
2013/08/09 13:04:13
bots are complaining about this, needs to be defin
Michael van Ouwerkerk
2013/08/09 13:05:24
Done.
| |
| 104 Win7LocationApi* api = Win7LocationApi::Create(); | |
| 105 if (api == NULL) | |
| 106 return NULL; // API not supported on this machine. | |
| 107 return new Win7LocationProvider(api); | |
| 108 } | |
| 109 | |
| 110 } // namespace content | |
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