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/*
* Copyright (C) 2020 Igalia S.L.
*
* 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. AND ITS CONTRIBUTORS ``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 ITS 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 "LazyLoadFrameObserver.h"
#include "DocumentInlines.h"
#include "HTMLIFrameElement.h"
#include "IntersectionObserverCallback.h"
#include "IntersectionObserverEntry.h"
#include "LocalFrame.h"
#include "RenderStyle.h"
#include <limits>
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(LazyLoadFrameObserver);
class LazyFrameLoadIntersectionObserverCallback final : public IntersectionObserverCallback {
public:
static Ref<LazyFrameLoadIntersectionObserverCallback> create(Document& document)
{
return adoptRef(*new LazyFrameLoadIntersectionObserverCallback(document));
}
private:
LazyFrameLoadIntersectionObserverCallback(Document& document)
: IntersectionObserverCallback(&document)
{
}
bool hasCallback() const final { return true; }
CallbackResult<void> handleEvent(IntersectionObserver&, const Vector<Ref<IntersectionObserverEntry>>& entries, IntersectionObserver&) final
{
ASSERT(!entries.isEmpty());
for (auto& entry : entries) {
if (!entry->isIntersecting())
continue;
if (RefPtr iframe = dynamicDowncast<HTMLIFrameElement>(entry->target())) {
iframe->lazyLoadFrameObserver().unobserve();
iframe->loadDeferredFrame();
}
}
return { };
}
CallbackResult<void> handleEventRethrowingException(IntersectionObserver& thisObserver, const Vector<Ref<IntersectionObserverEntry>>& entries, IntersectionObserver& observer) final
{
return handleEvent(thisObserver, entries, observer);
}
};
LazyLoadFrameObserver::LazyLoadFrameObserver(HTMLIFrameElement& element)
: m_element(element)
{
}
void LazyLoadFrameObserver::observe(const AtomString& frameURL, const ReferrerPolicy& referrerPolicy)
{
auto& frameObserver = m_element->lazyLoadFrameObserver();
auto* intersectionObserver = frameObserver.intersectionObserver(m_element->protectedDocument());
if (!intersectionObserver)
return;
m_frameURL = frameURL;
m_referrerPolicy = referrerPolicy;
intersectionObserver->observe(m_element);
}
void LazyLoadFrameObserver::unobserve()
{
auto& frameObserver = m_element->lazyLoadFrameObserver();
ASSERT(frameObserver.isObserved(m_element));
frameObserver.m_observer->unobserve(m_element);
}
IntersectionObserver* LazyLoadFrameObserver::intersectionObserver(Document& document)
{
if (!m_observer) {
auto callback = LazyFrameLoadIntersectionObserverCallback::create(document);
IntersectionObserver::Init options { std::nullopt, emptyString(), { } };
auto observer = IntersectionObserver::create(document, WTFMove(callback), WTFMove(options));
if (observer.hasException())
return nullptr;
m_observer = observer.releaseReturnValue();
}
return m_observer.get();
}
bool LazyLoadFrameObserver::isObserved(Element& element) const
{
return m_observer && m_observer->isObserving(element);
}
}
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