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#include "config.h"
27#include "IdChangeInvalidation.h"
28
29#include "ElementChildIterator.h"
30#include "StyleInvalidationFunctions.h"
31
32namespace WebCore {
33namespace Style {
34
35void IdChangeInvalidation::invalidateStyle(const AtomicString& changedId)
36{
37 if (changedId.isEmpty())
38 return;
39
40 bool mayAffectStyle = false;
41 bool mayAffectStyleInShadowTree = false;
42
43 traverseRuleFeatures(m_element, [&] (const RuleFeatureSet& features, bool mayAffectShadowTree) {
44 if (!features.idsInRules.contains(changedId))
45 return;
46 mayAffectStyle = true;
47 if (mayAffectShadowTree)
48 mayAffectStyleInShadowTree = true;
49 });
50
51 if (!mayAffectStyle)
52 return;
53
54 if (mayAffectStyleInShadowTree) {
55 m_element.invalidateStyleForSubtree();
56 return;
57 }
58
59 m_element.invalidateStyle();
60
61 // This could be easily optimized for fine-grained descendant invalidation similar to ClassChangeInvalidation.
62 // However using ids for dynamic styling is rare and this is probably not worth the memory cost of the required data structures.
63 auto& ruleSets = m_element.styleResolver().ruleSets();
64 bool mayAffectDescendantStyle = ruleSets.features().idsMatchingAncestorsInRules.contains(changedId);
65 if (mayAffectDescendantStyle)
66 m_element.invalidateStyleForSubtree();
67 else
68 m_element.invalidateStyle();
69}
70
71}
72}
73