1/*
2 * Copyright (C) 2016 Apple Inc. All rights reserved.
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#include "Element.h"
29
30namespace WebCore {
31
32namespace Style {
33
34class IdChangeInvalidation {
35public:
36 IdChangeInvalidation(Element&, const AtomicString& oldId, const AtomicString& newId);
37 ~IdChangeInvalidation();
38
39private:
40 void invalidateStyle(const AtomicString&);
41
42 const bool m_isEnabled;
43 Element& m_element;
44
45 AtomicString m_newId;
46};
47
48inline IdChangeInvalidation::IdChangeInvalidation(Element& element, const AtomicString& oldId, const AtomicString& newId)
49 : m_isEnabled(element.needsStyleInvalidation())
50 , m_element(element)
51{
52 if (!m_isEnabled)
53 return;
54 if (oldId == newId)
55 return;
56 m_newId = newId;
57 invalidateStyle(oldId);
58}
59
60inline IdChangeInvalidation::~IdChangeInvalidation()
61{
62 if (!m_isEnabled)
63 return;
64 invalidateStyle(m_newId);
65}
66
67}
68}
69