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| 1 // Copyright (c) 2009 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 "chrome/browser/power_save_blocker.h" | |
| 6 #include "content/browser/browser_thread.h" | |
| 7 | |
| 8 // Accessed only from the UI thread. | |
| 9 int PowerSaveBlocker::blocker_count_ = 0; | |
| 10 | |
| 11 PowerSaveBlocker::PowerSaveBlocker(bool enable) : enabled_(false) { | |
| 12 if (enable) | |
| 13 Enable(); | |
| 14 } | |
| 15 | |
| 16 PowerSaveBlocker::~PowerSaveBlocker(void) { | |
| 17 Disable(); | |
| 18 } | |
| 19 | |
| 20 void PowerSaveBlocker::Enable() { | |
| 21 if (enabled_) | |
| 22 return; | |
| 23 | |
| 24 enabled_ = true; | |
| 25 PostAdjustBlockCount(1); | |
| 26 } | |
| 27 | |
| 28 void PowerSaveBlocker::Disable() { | |
| 29 if (!enabled_) | |
| 30 return; | |
| 31 | |
| 32 enabled_ = false; | |
| 33 PostAdjustBlockCount(-1); | |
| 34 } | |
| 35 | |
| 36 | |
| 37 void PowerSaveBlocker::PostAdjustBlockCount(int delta) { | |
| 38 BrowserThread::PostTask( | |
| 39 BrowserThread::UI, FROM_HERE, | |
| 40 NewRunnableFunction(&PowerSaveBlocker::AdjustBlockCount, delta)); | |
| 41 } | |
| 42 | |
| 43 // Called only from UI thread. | |
| 44 void PowerSaveBlocker::AdjustBlockCount(int delta) { | |
| 45 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | |
| 46 | |
| 47 bool was_blocking = (blocker_count_ != 0); | |
| 48 | |
| 49 blocker_count_ += delta; | |
| 50 | |
| 51 bool is_blocking = (blocker_count_ != 0); | |
| 52 | |
| 53 DCHECK_GE(blocker_count_, 0); | |
| 54 | |
| 55 if (is_blocking != was_blocking) | |
| 56 ApplyBlock(is_blocking); | |
| 57 } | |
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