Home | History | Annotate | Download | only in browser 
      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_) {
     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
     88