1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include <memory>
#include <wtf/Forward.h>
#include <wtf/RefCounted.h>
#include <wtf/Vector.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class Document;
class MediaQueryList;
class RenderStyle;
class WeakPtrImplWithEventTargetData;
namespace MQ {
struct MediaQuery;
using MediaQueryList = Vector<MediaQuery>;
}
// MediaQueryMatcher class is responsible for evaluating the queries whenever it
// is needed and dispatch "change" event on MediaQueryLists if the corresponding
// query has changed. MediaQueryLists are invoked in the order in which they were added.
class MediaQueryMatcher final : public RefCounted<MediaQueryMatcher> {
public:
static Ref<MediaQueryMatcher> create(Document& document) { return adoptRef(*new MediaQueryMatcher(document)); }
~MediaQueryMatcher();
void documentDestroyed();
void addMediaQueryList(MediaQueryList&);
void removeMediaQueryList(MediaQueryList&);
RefPtr<MediaQueryList> matchMedia(const String&);
unsigned evaluationRound() const { return m_evaluationRound; }
enum class EventMode : uint8_t { Schedule, DispatchNow };
void evaluateAll(EventMode);
bool evaluate(const MQ::MediaQueryList&);
AtomString mediaType() const;
private:
explicit MediaQueryMatcher(Document&);
std::unique_ptr<RenderStyle> documentElementUserAgentStyle() const;
WeakPtr<Document, WeakPtrImplWithEventTargetData> m_document;
Vector<WeakPtr<MediaQueryList, WeakPtrImplWithEventTargetData>> m_mediaQueryLists;
// This value is incremented at style selector changes.
// It is used to avoid evaluating queries more then once and to make sure
// that a media query result change is notified exactly once.
unsigned m_evaluationRound { 1 };
};
} // namespace WebCore
|
