brightness_library.cc revision 21d179b334e59e9a3bfcaed4c4430bef1bc5759d 
1// Copyright (c) 2010 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/chromeos/cros/brightness_library.h"
6
7#include "base/message_loop.h"
8#include "base/observer_list.h"
9#include "chrome/browser/browser_thread.h"
10#include "chrome/browser/chromeos/brightness_bubble.h"
11#include "chrome/browser/chromeos/volume_bubble.h"
12#include "chrome/browser/chromeos/cros/cros_library.h"
13
14namespace chromeos {
15
16class BrightnessLibraryImpl : public BrightnessLibrary {
17 public:
18  BrightnessLibraryImpl() : brightness_connection_(NULL) {
19    if (CrosLibrary::Get()->EnsureLoaded())
20      Init();
21  }
22
23  ~BrightnessLibraryImpl() {
24    if (brightness_connection_) {
25      chromeos::DisconnectBrightness(brightness_connection_);
26      brightness_connection_ = NULL;
27    }
28  }
29
30  void AddObserver(Observer* observer) {
31    observers_.AddObserver(observer);
32  }
33
34  void RemoveObserver(Observer* observer) {
35    observers_.RemoveObserver(observer);
36  }
37
38 private:
39  static void BrightnessChangedHandler(void* object,
40                                       int brightness_level) {
41    BrightnessLibraryImpl* self = static_cast<BrightnessLibraryImpl*>(object);
42    self->OnBrightnessChanged(brightness_level);
43  }
44
45  void Init() {
46    DCHECK(!brightness_connection_) << "Already intialized";
47    brightness_connection_ =
48        chromeos::MonitorBrightness(&BrightnessChangedHandler, this);
49  }
50
51  void OnBrightnessChanged(int brightness_level) {
52    // Make sure we run on the UI thread.
53    if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
54      BrowserThread::PostTask(
55          BrowserThread::UI, FROM_HERE,
56          NewRunnableMethod(this,
57                            &BrightnessLibraryImpl::OnBrightnessChanged,
58                            brightness_level));
59      return;
60    }
61
62    FOR_EACH_OBSERVER(Observer,
63                      observers_,
64                      BrightnessChanged(brightness_level));
65  }
66
67  chromeos::BrightnessConnection brightness_connection_;
68
69  ObserverList<Observer> observers_;
70
71  DISALLOW_COPY_AND_ASSIGN(BrightnessLibraryImpl);
72};
73
74class BrightnessLibraryStubImpl : public BrightnessLibrary {
75 public:
76  BrightnessLibraryStubImpl() {}
77  ~BrightnessLibraryStubImpl() {}
78  void AddObserver(Observer* observer) {}
79  void RemoveObserver(Observer* observer) {}
80};
81
82// static
83BrightnessLibrary* BrightnessLibrary::GetImpl(bool stub) {
84  if (stub)
85    return new BrightnessLibraryStubImpl();
86  else
87    return new BrightnessLibraryImpl();
88}
89
90}  // namespace chromeos
91
92// Needed for NewRunnableMethod() call above.
93DISABLE_RUNNABLE_METHOD_REFCOUNT(chromeos::BrightnessLibraryImpl);
94