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 | |
37 | namespace WebCore { |
38 | |
39 | class Document; |
40 | class Element; |
41 | |
42 | struct ResizeObserverData { |
43 | Vector<WeakPtr<ResizeObserver>> observers; |
44 | }; |
45 | |
46 | class ResizeObserver : public RefCounted<ResizeObserver>, public ActiveDOMObject, public CanMakeWeakPtr<ResizeObserver> { |
47 | WTF_MAKE_FAST_ALLOCATED; |
48 | public: |
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 | |
72 | private: |
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 | |