From 6882a04fb36642862b11efe514251d32070c3d65 Mon Sep 17 00:00:00 2001
From: Konstantin Tokarev <annulen@yandex.ru>
Date: Thu, 25 Aug 2016 19:20:41 +0300
Subject: Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f
Reviewed-by: Konstantin Tokarev <annulen@yandex.ru>
---
 Source/WebCore/dom/GenericEventQueue.cpp | 112 ++++++++++++++++++++-----------
 1 file changed, 74 insertions(+), 38 deletions(-)

(limited to 'Source/WebCore/dom/GenericEventQueue.cpp')

diff --git a/Source/WebCore/dom/GenericEventQueue.cpp b/Source/WebCore/dom/GenericEventQueue.cpp
index a04e489c7..cd201a369 100644
--- a/Source/WebCore/dom/GenericEventQueue.cpp
+++ b/Source/WebCore/dom/GenericEventQueue.cpp
@@ -10,10 +10,10 @@
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
@@ -24,21 +24,19 @@
  */
 
 #include "config.h"
-
 #include "GenericEventQueue.h"
 
 #include "Event.h"
+#include "EventTarget.h"
+#include "Timer.h"
+#include <wtf/MainThread.h>
+#include <wtf/NeverDestroyed.h>
 
 namespace WebCore {
 
-PassOwnPtr<GenericEventQueue> GenericEventQueue::create(EventTarget* owner)
-{
-    return adoptPtr(new GenericEventQueue(owner));
-}
-
-GenericEventQueue::GenericEventQueue(EventTarget* owner)
+GenericEventQueue::GenericEventQueue(EventTarget& owner)
     : m_owner(owner)
-    , m_timer(this, &GenericEventQueue::timerFired)
+    , m_weakPtrFactory(this)
     , m_isClosed(false)
 {
 }
@@ -47,67 +45,105 @@ GenericEventQueue::~GenericEventQueue()
 {
 }
 
-bool GenericEventQueue::enqueueEvent(PassRefPtr<Event> event)
+void GenericEventQueue::enqueueEvent(RefPtr<Event>&& event)
 {
     if (m_isClosed)
-        return false;
+        return;
 
-    if (event->target() == m_owner)
-        event->setTarget(0);
+    if (event->target() == &m_owner)
+        event->setTarget(nullptr);
 
-    m_pendingEvents.append(event);
+    m_pendingEvents.append(WTFMove(event));
 
-    if (!m_timer.isActive())
-        m_timer.startOneShot(0);
+    if (m_isSuspended)
+        return;
 
-    return true;
+    pendingQueues().append(m_weakPtrFactory.createWeakPtr());
+    if (!sharedTimer().isActive())
+        sharedTimer().startOneShot(0);
 }
 
-bool GenericEventQueue::cancelEvent(Event* event)
+Timer& GenericEventQueue::sharedTimer()
 {
-    bool found = m_pendingEvents.contains(event);
+    ASSERT(isMainThread());
+    static NeverDestroyed<Timer> timer(GenericEventQueue::sharedTimerFired);
+    return timer.get();
+}
 
-    if (found)
-        m_pendingEvents.remove(m_pendingEvents.find(event));
+void GenericEventQueue::sharedTimerFired()
+{
+    ASSERT(!sharedTimer().isActive());
+    ASSERT(!pendingQueues().isEmpty());
+
+    while (!pendingQueues().isEmpty()) {
+        WeakPtr<GenericEventQueue> queue = pendingQueues().takeFirst();
+        if (!queue)
+            continue;
+        queue->dispatchOneEvent();
+    }
 
-    if (m_pendingEvents.isEmpty())
-        m_timer.stop();
+    if (sharedTimer().isActive())
+        sharedTimer().stop();
+}
 
-    return found;
+Deque<WeakPtr<GenericEventQueue>>& GenericEventQueue::pendingQueues()
+{
+    ASSERT(isMainThread());
+    static NeverDestroyed<Deque<WeakPtr<GenericEventQueue>>> queues;
+    return queues.get();
 }
 
-void GenericEventQueue::timerFired(Timer<GenericEventQueue>*)
+void GenericEventQueue::dispatchOneEvent()
 {
-    ASSERT(!m_timer.isActive());
     ASSERT(!m_pendingEvents.isEmpty());
 
-    Vector<RefPtr<Event> > pendingEvents;
-    m_pendingEvents.swap(pendingEvents);
-
-    RefPtr<EventTarget> protect(m_owner);
-    for (unsigned i = 0; i < pendingEvents.size(); ++i) {
-        EventTarget* target = pendingEvents[i]->target() ? pendingEvents[i]->target() : m_owner;
-        target->dispatchEvent(pendingEvents[i].release());
-    }
+    Ref<EventTarget> protect(m_owner);
+    RefPtr<Event> event = m_pendingEvents.takeFirst();
+    EventTarget& target = event->target() ? *event->target() : m_owner;
+    target.dispatchEvent(*event);
 }
 
 void GenericEventQueue::close()
 {
     m_isClosed = true;
 
-    m_timer.stop();
+    m_weakPtrFactory.revokeAll();
     m_pendingEvents.clear();
 }
 
 void GenericEventQueue::cancelAllEvents()
 {
-    m_timer.stop();
+    m_weakPtrFactory.revokeAll();
     m_pendingEvents.clear();
 }
 
 bool GenericEventQueue::hasPendingEvents() const
 {
-    return m_pendingEvents.size();
+    return !m_pendingEvents.isEmpty();
+}
+
+void GenericEventQueue::suspend()
+{
+    ASSERT(!m_isSuspended);
+    m_isSuspended = true;
+    m_weakPtrFactory.revokeAll();
+}
+
+void GenericEventQueue::resume()
+{
+    if (!m_isSuspended)
+        return;
+
+    m_isSuspended = false;
+
+    if (m_pendingEvents.isEmpty())
+        return;
+
+    for (unsigned i = 0; i < m_pendingEvents.size(); ++i)
+        pendingQueues().append(m_weakPtrFactory.createWeakPtr());
+
+    if (!sharedTimer().isActive())
+        sharedTimer().startOneShot(0);
 }
 
 }
-- 
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