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// Copyright 2014 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.
#ifndef EventDispatchForbiddenScope_h
#define EventDispatchForbiddenScope_h
#include "platform/PlatformExport.h"
#include "wtf/Allocator.h"
#include "wtf/Assertions.h"
#include "wtf/MainThread.h"
#include "wtf/TemporaryChange.h"
namespace blink {
#if ENABLE(ASSERT)
class EventDispatchForbiddenScope {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(EventDispatchForbiddenScope);
public:
EventDispatchForbiddenScope()
{
ASSERT(isMainThread());
++s_count;
}
~EventDispatchForbiddenScope()
{
ASSERT(isMainThread());
ASSERT(s_count);
--s_count;
}
static bool isEventDispatchForbidden()
{
if (!isMainThread())
return false;
return s_count;
}
class AllowUserAgentEvents {
STACK_ALLOCATED();
public:
AllowUserAgentEvents()
: m_change(s_count, 0)
{
ASSERT(isMainThread());
}
~AllowUserAgentEvents()
{
ASSERT(!s_count);
}
TemporaryChange<unsigned> m_change;
};
private:
PLATFORM_EXPORT static unsigned s_count;
};
#else
class EventDispatchForbiddenScope {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(EventDispatchForbiddenScope);
public:
EventDispatchForbiddenScope() { }
class AllowUserAgentEvents {
public:
AllowUserAgentEvents() { }
};
};
#endif // ENABLE(ASSERT)
} // namespace blink
#endif // EventDispatchForbiddenScope_h
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