Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 Apple Inc. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| 14 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 15 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| 17 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 18 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 19 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 20 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 21 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 22 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| 23 | * THE POSSIBILITY OF SUCH DAMAGE. |
| 24 | */ |
| 25 | |
| 26 | #ifndef EventSender_h |
| 27 | #define EventSender_h |
| 28 | |
| 29 | #include "core/platform/Timer.h" |
Ben Murdoch | e69819b | 2013-07-17 14:56:49 +0100 | [diff] [blame] | 30 | #include "wtf/Vector.h" |
| 31 | #include "wtf/text/AtomicString.h" |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 32 | |
| 33 | namespace WebCore { |
| 34 | |
| 35 | template<typename T> class EventSender { |
| 36 | WTF_MAKE_NONCOPYABLE(EventSender); WTF_MAKE_FAST_ALLOCATED; |
| 37 | public: |
| 38 | explicit EventSender(const AtomicString& eventType); |
| 39 | |
| 40 | const AtomicString& eventType() const { return m_eventType; } |
| 41 | void dispatchEventSoon(T*); |
| 42 | void cancelEvent(T*); |
| 43 | void dispatchPendingEvents(); |
| 44 | |
| 45 | #ifndef NDEBUG |
| 46 | bool hasPendingEvents(T* sender) const |
| 47 | { |
| 48 | return m_dispatchSoonList.find(sender) != notFound || m_dispatchingList.find(sender) != notFound; |
| 49 | } |
| 50 | #endif |
| 51 | |
| 52 | private: |
| 53 | void timerFired(Timer<EventSender<T> >*) { dispatchPendingEvents(); } |
| 54 | |
| 55 | AtomicString m_eventType; |
| 56 | Timer<EventSender<T> > m_timer; |
| 57 | Vector<T*> m_dispatchSoonList; |
| 58 | Vector<T*> m_dispatchingList; |
| 59 | }; |
| 60 | |
| 61 | template<typename T> EventSender<T>::EventSender(const AtomicString& eventType) |
| 62 | : m_eventType(eventType) |
| 63 | , m_timer(this, &EventSender::timerFired) |
| 64 | { |
| 65 | } |
| 66 | |
| 67 | template<typename T> void EventSender<T>::dispatchEventSoon(T* sender) |
| 68 | { |
| 69 | m_dispatchSoonList.append(sender); |
| 70 | if (!m_timer.isActive()) |
| 71 | m_timer.startOneShot(0); |
| 72 | } |
| 73 | |
| 74 | template<typename T> void EventSender<T>::cancelEvent(T* sender) |
| 75 | { |
| 76 | // Remove instances of this sender from both lists. |
| 77 | // Use loops because we allow multiple instances to get into the lists. |
| 78 | size_t size = m_dispatchSoonList.size(); |
| 79 | for (size_t i = 0; i < size; ++i) { |
| 80 | if (m_dispatchSoonList[i] == sender) |
| 81 | m_dispatchSoonList[i] = 0; |
| 82 | } |
| 83 | size = m_dispatchingList.size(); |
| 84 | for (size_t i = 0; i < size; ++i) { |
| 85 | if (m_dispatchingList[i] == sender) |
| 86 | m_dispatchingList[i] = 0; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | template<typename T> void EventSender<T>::dispatchPendingEvents() |
| 91 | { |
| 92 | // Need to avoid re-entering this function; if new dispatches are |
| 93 | // scheduled before the parent finishes processing the list, they |
| 94 | // will set a timer and eventually be processed. |
| 95 | if (!m_dispatchingList.isEmpty()) |
| 96 | return; |
| 97 | |
| 98 | m_timer.stop(); |
| 99 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 100 | m_dispatchingList.swap(m_dispatchSoonList); |
| 101 | size_t size = m_dispatchingList.size(); |
| 102 | for (size_t i = 0; i < size; ++i) { |
| 103 | if (T* sender = m_dispatchingList[i]) { |
| 104 | m_dispatchingList[i] = 0; |
| 105 | sender->dispatchPendingEvent(this); |
| 106 | } |
| 107 | } |
| 108 | m_dispatchingList.clear(); |
| 109 | } |
| 110 | |
| 111 | } // namespace WebCore |
| 112 | |
| 113 | #endif // EventSender_h |