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-rw-r--r--chromium/base/android/activity_status.h98
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diff --git a/chromium/base/android/activity_status.h b/chromium/base/android/activity_status.h
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--- a/chromium/base/android/activity_status.h
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-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef BASE_ANDROID_ACTIVITY_STATUS_H_
-#define BASE_ANDROID_ACTIVITY_STATUS_H_
-
-#include <jni.h>
-
-#include "base/android/jni_android.h"
-#include "base/base_export.h"
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/singleton.h"
-#include "base/observer_list_threadsafe.h"
-
-namespace base {
-namespace android {
-
-// Define activity state values like ACTIVITY_STATE_CREATED in a
-// way that ensures they're always the same than their Java counterpart.
-enum ActivityState {
-#define DEFINE_ACTIVITY_STATE(x, y) ACTIVITY_STATE_##x = y,
-#include "base/android/activity_state_list.h"
-#undef DEFINE_ACTIVITY_STATE
-};
-
-// A native helper class to listen to state changes of the current
-// Android Activity. This mirrors org.chromium.base.ActivityStatus.
-// any thread.
-//
-// To start listening, create a new instance, passing a callback to a
-// function that takes an ActivityState parameter. To stop listening,
-// simply delete the listener object. The implementation guarantees
-// that the callback will always be called on the thread that created
-// the listener.
-//
-// Example:
-//
-// void OnActivityStateChange(ActivityState state) {
-// ...
-// }
-//
-// // Start listening.
-// ActivityStatus::Listener* my_listener =
-// new ActivityStatus::Listener(base::Bind(&OnActivityStateChange));
-//
-// ...
-//
-// // Stop listening.
-// delete my_listener
-//
-class BASE_EXPORT ActivityStatus {
- public:
- typedef base::Callback<void(ActivityState)> StateChangeCallback;
-
- class Listener {
- public:
- explicit Listener(const StateChangeCallback& callback);
- ~Listener();
-
- private:
- friend class ActivityStatus;
-
- void Notify(ActivityState state);
-
- StateChangeCallback callback_;
-
- DISALLOW_COPY_AND_ASSIGN(Listener);
- };
-
- // NOTE: The Java ActivityStatus is a singleton too.
- static ActivityStatus* GetInstance();
-
- // Internal use: must be public to be called from base_jni_registrar.cc
- static bool RegisterBindings(JNIEnv* env);
-
- // Internal use only: must be public to be called from JNI and unit tests.
- void OnActivityStateChange(ActivityState new_state);
-
- private:
- friend struct DefaultSingletonTraits<ActivityStatus>;
-
- ActivityStatus();
- ~ActivityStatus();
-
- void RegisterListener(Listener* listener);
- void UnregisterListener(Listener* listener);
-
- scoped_refptr<ObserverListThreadSafe<Listener> > observers_;
-
- DISALLOW_COPY_AND_ASSIGN(ActivityStatus);
-};
-
-} // namespace android
-} // namespace base
-
-#endif // BASE_ANDROID_ACTIVITY_STATUS_H_