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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2016 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "ContainerNode.h"
#include <wtf/MainThread.h>
namespace WebCore {
class NoEventDispatchAssertion {
public:
NoEventDispatchAssertion()
{
#if !ASSERT_DISABLED
if (!isMainThread())
return;
++s_count;
#endif
}
NoEventDispatchAssertion(const NoEventDispatchAssertion&)
: NoEventDispatchAssertion()
{
}
~NoEventDispatchAssertion()
{
#if !ASSERT_DISABLED
if (!isMainThread())
return;
ASSERT(s_count);
s_count--;
#endif
}
static bool isEventAllowedInMainThread()
{
#if ASSERT_DISABLED
return true;
#else
return !isMainThread() || !s_count;
#endif
}
static bool isEventDispatchAllowedInSubtree(Node& node)
{
return isEventAllowedInMainThread() || EventAllowedScope::isAllowedNode(node);
}
#if !ASSERT_DISABLED
class EventAllowedScope {
public:
explicit EventAllowedScope(ContainerNode& userAgentContentRoot)
: m_eventAllowedTreeRoot(userAgentContentRoot)
, m_previousScope(s_currentScope)
{
s_currentScope = this;
}
~EventAllowedScope()
{
s_currentScope = m_previousScope;
}
static bool isAllowedNode(Node& node)
{
return s_currentScope && s_currentScope->isAllowedNodeInternal(node);
}
private:
bool isAllowedNodeInternal(Node& node)
{
return m_eventAllowedTreeRoot->contains(&node) || (m_previousScope && m_previousScope->isAllowedNodeInternal(node));
}
Ref<ContainerNode> m_eventAllowedTreeRoot;
EventAllowedScope* m_previousScope;
static EventAllowedScope* s_currentScope;
};
#else
class EventAllowedScope {
public:
explicit EventAllowedScope(ContainerNode&) { }
static bool isAllowedNode(Node&) { return true; }
};
#endif
#if !ASSERT_DISABLED
class DisableAssertionsInScope {
public:
DisableAssertionsInScope()
{
if (!isMainThread())
return;
s_existingCount = s_count;
s_count = 0;
}
~DisableAssertionsInScope()
{
s_count = s_existingCount;
s_existingCount = 0;
}
private:
WEBCORE_EXPORT static unsigned s_existingCount;
};
#else
class DisableAssertionsInScope {
public:
DisableAssertionsInScope() { }
};
#endif
#if !ASSERT_DISABLED
private:
WEBCORE_EXPORT static unsigned s_count;
#endif
};
} // namespace WebCore
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