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/*
* Copyright (C) 2019 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 "GCReachableRef.h"
#include "ResizeObservation.h"
#include "ResizeObserverCallback.h"
#include <wtf/Lock.h>
#include <wtf/RefCountedAndCanMakeWeakPtr.h>
#include <wtf/WeakPtr.h>
namespace JSC {
class AbstractSlotVisitor;
}
namespace WebCore {
class Document;
class Element;
struct ResizeObserverOptions;
struct ResizeObserverData {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
Vector<WeakPtr<ResizeObserver>> observers;
};
using NativeResizeObserverCallback = void (*)(const Vector<Ref<ResizeObserverEntry>>&, ResizeObserver&);
using JSOrNativeResizeObserverCallback = std::variant<RefPtr<ResizeObserverCallback>, NativeResizeObserverCallback>;
class ResizeObserver : public RefCountedAndCanMakeWeakPtr<ResizeObserver> {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(ResizeObserver);
public:
static Ref<ResizeObserver> create(Document&, Ref<ResizeObserverCallback>&&);
static Ref<ResizeObserver> createNativeObserver(Document&, NativeResizeObserverCallback&&);
~ResizeObserver();
bool hasObservations() const { return m_observations.size(); }
bool hasActiveObservations() const { return m_activeObservations.size(); }
void observe(Element&);
void observe(Element&, const ResizeObserverOptions&);
void unobserve(Element&);
void disconnect();
void targetDestroyed(Element&);
static size_t maxElementDepth() { return SIZE_MAX; }
size_t gatherObservations(size_t depth);
void deliverObservations();
bool hasSkippedObservations() const { return m_hasSkippedObservations; }
void setHasSkippedObservations(bool skipped) { m_hasSkippedObservations = skipped; }
void resetObservationSize(Element&);
ResizeObserverCallback* callbackConcurrently();
bool isReachableFromOpaqueRoots(JSC::AbstractSlotVisitor&) const;
private:
ResizeObserver(Document&, JSOrNativeResizeObserverCallback&&);
bool removeTarget(Element&);
void removeAllTargets();
bool removeObservation(const Element&);
void observeInternal(Element&, const ResizeObserverBoxOptions);
bool isNativeCallback();
bool isJSCallback();
WeakPtr<Document, WeakPtrImplWithEventTargetData> m_document;
JSOrNativeResizeObserverCallback m_JSOrNativeCallback;
Vector<Ref<ResizeObservation>> m_observations;
Vector<Ref<ResizeObservation>> m_activeObservations;
Vector<GCReachableRef<Element>> m_activeObservationTargets;
Vector<GCReachableRef<Element>> m_targetsWaitingForFirstObservation;
bool m_hasSkippedObservations { false };
};
} // namespace WebCore
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