content/browser/power_save_blocker_android.cc

   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/power_save_blocker_android.h"
   6
   7 #include "base/android/jni_android.h"
   8 #include "base/android/jni_weak_ref.h"
   9 #include "base/logging.h"
  10 #include "content/browser/power_save_blocker_impl.h"
  11 #include "content/public/browser/android/content_view_core.h"
  12 #include "content/public/browser/browser_thread.h"
  13 #include "jni/PowerSaveBlocker_jni.h"
  14 #include "ui/base/android/view_android.h"
  15
  16 using base::android::AttachCurrentThread;
  17 using base::android::ScopedJavaLocalRef;
  18 using gfx::NativeView;
  19
  20 namespace content {
  21
  22 class PowerSaveBlockerImpl::Delegate
  23     : public base::RefCountedThreadSafe<PowerSaveBlockerImpl::Delegate> {
  24  public:
  25   explicit Delegate(NativeView view_android) {
  26     j_view_android_ = JavaObjectWeakGlobalRef(
  27         AttachCurrentThread(), view_android->GetJavaObject().obj());
  28   }
  29
  30   // Does the actual work to apply or remove the desired power save block.
  31   void ApplyBlock();
  32   void RemoveBlock();
  33
  34  private:
  35   friend class base::RefCountedThreadSafe<Delegate>;
  36   ~Delegate() {}
  37
  38   JavaObjectWeakGlobalRef j_view_android_;
  39
  40   DISALLOW_COPY_AND_ASSIGN(Delegate);
  41 };
  42
  43 void PowerSaveBlockerImpl::Delegate::ApplyBlock() {
  44   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  45   JNIEnv* env = AttachCurrentThread();
  46   ScopedJavaLocalRef<jobject> j_object = j_view_android_.get(env);
  47   if (j_object.obj())
  48     Java_PowerSaveBlocker_applyBlock(env, j_object.obj());
  49 }
  50
  51 void PowerSaveBlockerImpl::Delegate::RemoveBlock() {
  52   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  53   JNIEnv* env = AttachCurrentThread();
  54   ScopedJavaLocalRef<jobject> j_object = j_view_android_.get(env);
  55   if (j_object.obj())
  56     Java_PowerSaveBlocker_removeBlock(env, j_object.obj());
  57 }
  58
  59 PowerSaveBlockerImpl::PowerSaveBlockerImpl(PowerSaveBlockerType type,
  60                                            const std::string& reason) {
  61   // Don't support kPowerSaveBlockPreventAppSuspension
  62 }
  63
  64 PowerSaveBlockerImpl::~PowerSaveBlockerImpl() {
  65   if (delegate_.get()) {
  66     BrowserThread::PostTask(
  67         BrowserThread::UI, FROM_HERE,
  68         base::Bind(&Delegate::RemoveBlock, delegate_));
  69   }
  70 }
  71
  72 void PowerSaveBlockerImpl::InitDisplaySleepBlocker(NativeView view_android) {
  73   if (!view_android)
  74     return;
  75
  76   delegate_ = new Delegate(view_android);
  77   // This may be called on any thread.
  78   BrowserThread::PostTask(
  79       BrowserThread::UI, FROM_HERE,
  80       base::Bind(&Delegate::ApplyBlock, delegate_));
  81 }
  82
  83 bool RegisterPowerSaveBlocker(JNIEnv* env) {
  84   return RegisterNativesImpl(env);
  85 }
  86
  87 }  // namespace content