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 "ResizeObservation.h"
32#include "ResizeObserverCallback.h"
33#include <wtf/RefCounted.h>
34#include <wtf/WeakPtr.h>
35
36namespace WebCore {
37
38class Document;
39class Element;
40
41struct ResizeObserverData {
42 Vector<WeakPtr<ResizeObserver>> observers;
43};
44
45class ResizeObserver : public RefCounted<ResizeObserver>, public ActiveDOMObject, public CanMakeWeakPtr<ResizeObserver> {
46 WTF_MAKE_FAST_ALLOCATED;
47public:
48 static Ref<ResizeObserver> create(Document&, Ref<ResizeObserverCallback>&&);
49 ~ResizeObserver();
50
51 bool hasObservations() const { return m_observations.size(); }
52 bool hasActiveObservations() const { return m_activeObservations.size(); }
53
54 void observe(Element&);
55 void unobserve(Element&);
56 void disconnect();
57 void targetDestroyed(Element&);
58
59 static size_t maxElementDepth() { return SIZE_MAX; }
60 size_t gatherObservations(size_t depth);
61 void deliverObservations();
62 bool hasSkippedObservations() const { return m_hasSkippedObservations; }
63 void setHasSkippedObservations(bool skipped) { m_hasSkippedObservations = skipped; }
64
65 // ActiveDOMObject.
66 bool hasPendingActivity() const override;
67 const char* activeDOMObjectName() const override;
68 bool canSuspendForDocumentSuspension() const override;
69 void stop() override;
70
71private:
72 ResizeObserver(Document&, Ref<ResizeObserverCallback>&&);
73
74 bool removeTarget(Element&);
75 void removeAllTargets();
76 bool removeObservation(const Element&);
77
78 WeakPtr<Document> m_document;
79 RefPtr<ResizeObserverCallback> m_callback;
80 Vector<Ref<ResizeObservation>> m_observations;
81
82 Vector<Ref<ResizeObservation>> m_activeObservations;
83 bool m_hasSkippedObservations { false };
84};
85
86} // namespace WebCore
87
88#endif // ENABLE(RESIZE_OBSERVER)
89