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#include "FloatRect.h"
30#include "LayoutSize.h"
31
32#include <wtf/RefCounted.h>
33
34namespace WebCore {
35
36class Element;
37
38class ResizeObservation : public RefCounted<ResizeObservation> {
39 WTF_MAKE_FAST_ALLOCATED;
40public:
41 static Ref<ResizeObservation> create(Element* target);
42
43 ~ResizeObservation();
44
45 void updateObservationSize(const LayoutSize&);
46 LayoutSize computeObservedSize() const;
47 LayoutPoint computeTargetLocation() const;
48 FloatRect computeContentRect() const;
49
50 bool elementSizeChanged(LayoutSize&) const;
51 Element* target() const { return m_target; }
52 size_t targetElementDepth() const;
53
54private:
55 ResizeObservation(Element* target);
56
57 Element* m_target;
58 LayoutSize m_lastObservationSize;
59};
60
61} // namespace WebCore
62
63#endif // ENABLE(RESIZE_OBSERVER)
64