blob: 86b258c51ef9a8d76d6e39e5d9969dd6caeb8a04 [file] [log] [blame]
/*
* 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.
*/
#pragma once
#include "IntersectionObserver.h"
namespace WebCore {
class Document;
class Element;
class LazyLoadImageObserver {
WTF_MAKE_FAST_ALLOCATED;
public:
static void observe(Element&);
static void unobserve(Element&, Document&);
private:
friend class Document;
static std::unique_ptr<LazyLoadImageObserver> create()
{
return std::unique_ptr<LazyLoadImageObserver>(new LazyLoadImageObserver());
}
LazyLoadImageObserver() = default;
IntersectionObserver* intersectionObserver(Document&);
bool isObserved(Element&) const;
// The intersection observer responsible for loading the image once it's near the viewport.
RefPtr<IntersectionObserver> m_lazyLoadIntersectionObserver;
};
} // namespace