| // Copyright 2016 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. |
| |
| #include "ui/events/devices/input_device_manager.h" |
| #include "base/lazy_instance.h" |
| #include "base/threading/thread_local.h" |
| |
| namespace ui { |
| namespace { |
| |
| // InputDeviceManager singleton is thread-local so that different instances can |
| // be used on different threads (eg. UI Service thread vs. browser UI thread). |
| base::LazyInstance<base::ThreadLocalPointer<InputDeviceManager>>::Leaky |
| lazy_tls_ptr = LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| // static |
| InputDeviceManager* InputDeviceManager::GetInstance() { |
| InputDeviceManager* instance = lazy_tls_ptr.Pointer()->Get(); |
| DCHECK(instance) << "InputDeviceManager::SetInstance must be called before " |
| "getting the instance of InputDeviceManager."; |
| return instance; |
| } |
| |
| // static |
| bool InputDeviceManager::HasInstance() { |
| return lazy_tls_ptr.Pointer()->Get() != nullptr; |
| } |
| |
| // static |
| void InputDeviceManager::SetInstance(InputDeviceManager* instance) { |
| DCHECK(!lazy_tls_ptr.Pointer()->Get()); |
| lazy_tls_ptr.Pointer()->Set(instance); |
| } |
| |
| // static |
| void InputDeviceManager::ClearInstance() { |
| lazy_tls_ptr.Pointer()->Set(nullptr); |
| } |
| |
| } // namespace ui |