61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_DeviceChangeCallback_h
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#define mozilla_DeviceChangeCallback_h
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namespace mozilla {
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class DeviceChangeCallback
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{
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public:
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virtual void OnDeviceChange()
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{
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MutexAutoLock lock(mCallbackMutex);
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for (DeviceChangeCallback* observer : mDeviceChangeCallbackList)
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{
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observer->OnDeviceChange();
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}
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}
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virtual int AddDeviceChangeCallback(DeviceChangeCallback* aCallback)
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{
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MutexAutoLock lock(mCallbackMutex);
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if (mDeviceChangeCallbackList.IndexOf(aCallback) == mDeviceChangeCallbackList.NoIndex)
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mDeviceChangeCallbackList.AppendElement(aCallback);
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return 0;
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}
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virtual int RemoveDeviceChangeCallback(DeviceChangeCallback* aCallback)
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{
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MutexAutoLock lock(mCallbackMutex);
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return RemoveDeviceChangeCallbackLocked(aCallback);
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}
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virtual int RemoveDeviceChangeCallbackLocked(DeviceChangeCallback* aCallback)
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{
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mCallbackMutex.AssertCurrentThreadOwns();
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if (mDeviceChangeCallbackList.IndexOf(aCallback) != mDeviceChangeCallbackList.NoIndex)
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mDeviceChangeCallbackList.RemoveElement(aCallback);
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return 0;
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}
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DeviceChangeCallback() : mCallbackMutex("mozilla::media::DeviceChangeCallback::mCallbackMutex")
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{
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}
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virtual ~DeviceChangeCallback()
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{
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}
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protected:
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nsTArray<DeviceChangeCallback*> mDeviceChangeCallbackList;
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Mutex mCallbackMutex;
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};
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} // namespace mozilla
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#endif // mozilla_DeviceChangeCallback_h
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