shaka-packager/base/android/activity_status.h

99 lines
2.7 KiB
C++

// 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_