1/*
2 * Copyright (C) 2019 Igalia S.L.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#if ENABLE(RESIZE_OBSERVER)
29
30#include "ActiveDOMObject.h"
31#include "GCReachableRef.h"
32#include "ResizeObservation.h"
33#include "ResizeObserverCallback.h"
34#include <wtf/RefCounted.h>
35#include <wtf/WeakPtr.h>
36
37namespace WebCore {
38
39class Document;
40class Element;
41
42struct ResizeObserverData {
43 Vector<WeakPtr<ResizeObserver>> observers;
44};
45
46class ResizeObserver : public RefCounted<ResizeObserver>, public ActiveDOMObject, public CanMakeWeakPtr<ResizeObserver> {
47 WTF_MAKE_FAST_ALLOCATED;
48public:
49 static Ref<ResizeObserver> create(Document&, Ref<ResizeObserverCallback>&&);
50 ~ResizeObserver();
51
52 bool hasObservations() const { return m_observations.size(); }
53 bool hasActiveObservations() const { return m_activeObservations.size(); }
54
55 void observe(Element&);
56 void unobserve(Element&);
57 void disconnect();
58 void targetDestroyed(Element&);
59
60 static size_t maxElementDepth() { return SIZE_MAX; }
61 size_t gatherObservations(size_t depth);
62 void deliverObservations();
63 bool hasSkippedObservations() const { return m_hasSkippedObservations; }
64 void setHasSkippedObservations(bool skipped) { m_hasSkippedObservations = skipped; }
65
66 // ActiveDOMObject.
67 bool hasPendingActivity() const override;
68 const char* activeDOMObjectName() const override;
69 bool canSuspendForDocumentSuspension() const override;
70 void stop() override;
71
72private:
73 ResizeObserver(Document&, Ref<ResizeObserverCallback>&&);
74
75 bool removeTarget(Element&);
76 void removeAllTargets();
77 bool removeObservation(const Element&);
78
79 WeakPtr<Document> m_document;
80 RefPtr<ResizeObserverCallback> m_callback;
81 Vector<Ref<ResizeObservation>> m_observations;
82
83 Vector<Ref<ResizeObservation>> m_activeObservations;
84 Vector<GCReachableRef<Element>> m_pendingTargets;
85 bool m_hasSkippedObservations { false };
86};
87
88} // namespace WebCore
89
90#endif // ENABLE(RESIZE_OBSERVER)
91