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/*
* Copyright (C) 2012 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* 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 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 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
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DOMWindowExtension.h"
#include "DOMWindow.h"
#include "DOMWrapperWorld.h"
#include "Frame.h"
#include "FrameLoaderClient.h"
namespace WebCore {
DOMWindowExtension::DOMWindowExtension(Frame* frame, DOMWrapperWorld* world)
: DOMWindowProperty(frame)
, m_world(world)
, m_disconnectedDOMWindow(0)
, m_wasDetached(false)
{
ASSERT(this->frame());
ASSERT(m_world);
}
DOMWindowExtension::~DOMWindowExtension()
{
// DOMWindowExtension lifetime isn't tied directly to the DOMWindow itself so it is important that it unregister
// itself from any DOMWindow it is associated with when destroyed.
// This might happen if the DOMWindowExtension is destroyed while its DOMWindow is in a CachedPage.
if (m_disconnectedDOMWindow)
m_disconnectedDOMWindow->unregisterProperty(this);
}
void DOMWindowExtension::disconnectFrame()
{
// The DOMWindow destructor calls disconnectFrame on all its DOMWindowProperties, even if it
// did that already when entering the page cache.
if (m_disconnectedFrame) {
ASSERT(!frame());
return;
}
// Calling out to the client might result in this DOMWindowExtension being destroyed
// while there is still work to do.
RefPtr<DOMWindowExtension> protector = this;
// DOMWindowProperties are disconnected from frames after they are detached.
// DOMWindowExtensions only want to stay prepared for client callbacks if they've never been detached.
if (!m_wasDetached) {
Frame* frame = this->frame();
frame->loader()->client()->dispatchWillDisconnectDOMWindowExtensionFromGlobalObject(this);
m_disconnectedFrame = frame;
m_disconnectedDOMWindow = frame->domWindow();
}
DOMWindowProperty::disconnectFrame();
}
void DOMWindowExtension::reconnectFrame(Frame* frame)
{
// DOMWindowProperties should never reconnect to a frame after they've been detached from the page.
ASSERT(!m_wasDetached);
ASSERT(m_disconnectedFrame == frame);
DOMWindowProperty::reconnectFrame(frame);
m_disconnectedFrame = 0;
m_disconnectedDOMWindow = 0;
this->frame()->loader()->client()->dispatchDidReconnectDOMWindowExtensionToGlobalObject(this);
}
void DOMWindowExtension::willDetachPage()
{
// willDetachPage might be called multiple times but we only want to react once.
if (m_wasDetached)
return;
// Calling out to the client might result in this DOMWindowExtension being destroyed
// while there is still work to do.
RefPtr<DOMWindowExtension> protector = this;
Frame* frame = m_disconnectedFrame.get();
if (!frame)
frame = this->frame();
ASSERT(frame);
// DOMWindowExtension lifetime isn't tied directly to the DOMWindow itself so it is important that it unregister
// itself from any DOMWindow it is associated with when detached.
// This might be the disconnected DOMWindow if the DOMWindow is in a CachedPage that is pruned.
DOMWindow* associatedDOMWindow = m_disconnectedDOMWindow ? m_disconnectedDOMWindow : frame->domWindow();
associatedDOMWindow->unregisterProperty(this);
m_disconnectedDOMWindow = 0;
frame->loader()->client()->dispatchWillDestroyGlobalObjectForDOMWindowExtension(this);
m_disconnectedFrame = 0;
DOMWindowProperty::willDetachPage();
m_wasDetached = true;
}
} // namespace WebCore
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