blob: 12e7b4b4dfc84914c88e59a4997d5de8911588bc [file] [log] [blame]
// Copyright 2016 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 ResizeObservation_h
#define ResizeObservation_h
#include "core/CoreExport.h"
#include "core/resize_observer/ResizeObserverEntry.h"
#include "platform/geometry/LayoutSize.h"
#include "platform/heap/Handle.h"
namespace blink {
class Element;
class ResizeObserver;
// ResizeObservation represents an element that is being observed.
class CORE_EXPORT ResizeObservation final
: public GarbageCollected<ResizeObservation> {
ResizeObservation(Element* target, ResizeObserver*);
Element* Target() const { return target_; }
size_t TargetDepth();
// True if observationSize differs from target's current size.
bool ObservationSizeOutOfSync();
void SetObservationSize(const LayoutSize&);
void ElementSizeChanged();
LayoutSize ComputeTargetSize() const;
LayoutPoint ComputeTargetLocation() const;
void Trace(blink::Visitor*);
WeakMember<Element> target_;
Member<ResizeObserver> observer_;
// Target size sent in last observation notification.
LayoutSize observation_size_;
bool element_size_changed_;
} // namespace blink
#endif // ResizeObservation_h