1 // Copyright (c) 2009 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 #ifndef CHROME_COMMON_DEPRECATED_EVENT_SYS_H_ 6 #define CHROME_COMMON_DEPRECATED_EVENT_SYS_H_ 7 #pragma once 8 9 // TODO: This class should be removed or moved to Notifier code. 10 // See Bug 42450 (http://code.google.com/p/chromium/issues/detail?id=42450). 11 12 namespace base { 13 class AutoLock; 14 class Lock; 15 } 16 17 // An abstract base class for listening to events. 18 // 19 // Don't inherit from this class yourself. Using NewEventListenerHookup() is 20 // much easier. 21 template <typename EventType> 22 class EventListener { 23 public: 24 virtual void HandleEvent(const EventType& event) = 0; 25 26 protected: ~EventListener()27 virtual ~EventListener() {} 28 }; 29 30 // See the -inl.h for details about the following. 31 32 template <typename EventTraits, typename NotifyLock = base::Lock, 33 typename ScopedNotifyLocker = base::AutoLock> 34 class EventChannel; 35 36 class EventListenerHookup; 37 38 template <typename EventChannel, typename CallbackObject, 39 typename CallbackMethod> 40 EventListenerHookup* NewEventListenerHookup(EventChannel* channel, 41 CallbackObject* cbobject, 42 CallbackMethod cbmethod); 43 44 template <typename EventChannel, typename CallbackObject, 45 typename CallbackMethod, typename CallbackArg0> 46 EventListenerHookup* NewEventListenerHookup(EventChannel* channel, 47 CallbackObject* cbobject, 48 CallbackMethod cbmethod, 49 CallbackArg0 arg0); 50 51 #endif // CHROME_COMMON_DEPRECATED_EVENT_SYS_H_ 52