1 /*
2 * Copyright (C) 2012 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Neither the name of Google Inc. nor the names of its
11 * contributors may be used to endorse or promote products derived from
12 * this software without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef ContextFeatures_h
28 #define ContextFeatures_h
29
30 #include "platform/RefCountedSupplement.h"
31
32 namespace WebCore {
33
34 class ContextFeaturesClient;
35 class Document;
36 class Page;
37
38 class ContextFeatures : public RefCountedSupplement<Page, ContextFeatures> {
39 public:
40 enum FeatureType {
41 DialogElement = 0,
42 StyleScoped,
43 PagePopup,
44 MutationEvents,
45 PushState,
46 FeatureTypeSize // Should be the last entry.
47 };
48
49 static const char* supplementName();
50 static ContextFeatures* defaultSwitch();
51 static PassRefPtr<ContextFeatures> create(ContextFeaturesClient*);
52
53 static bool dialogElementEnabled(Document*);
54 static bool styleScopedEnabled(Document*);
55 static bool pagePopupEnabled(Document*);
56 static bool mutationEventsEnabled(Document*);
57 static bool pushStateEnabled(Document*);
58
59 bool isEnabled(Document*, FeatureType, bool) const;
60 void urlDidChange(Document*);
61
62 private:
ContextFeatures(ContextFeaturesClient * client)63 explicit ContextFeatures(ContextFeaturesClient* client)
64 : m_client(client)
65 { }
66
67 virtual void hostDestroyed() OVERRIDE;
68
69 ContextFeaturesClient* m_client;
70 };
71
hostDestroyed()72 inline void ContextFeatures::hostDestroyed()
73 {
74 m_client = 0;
75 }
76
77
78 class ContextFeaturesClient {
79 WTF_MAKE_FAST_ALLOCATED;
80 public:
81 static ContextFeaturesClient* empty();
82
~ContextFeaturesClient()83 virtual ~ContextFeaturesClient() { }
isEnabled(Document *,ContextFeatures::FeatureType,bool defaultValue)84 virtual bool isEnabled(Document*, ContextFeatures::FeatureType, bool defaultValue) { return defaultValue; }
urlDidChange(Document *)85 virtual void urlDidChange(Document*) { }
86 };
87
88 void provideContextFeaturesTo(Page*, ContextFeaturesClient*);
89 void provideContextFeaturesToDocumentFrom(Document*, Page*);
90
create(ContextFeaturesClient * client)91 inline PassRefPtr<ContextFeatures> ContextFeatures::create(ContextFeaturesClient* client)
92 {
93 return adoptRef(new ContextFeatures(client));
94 }
95
isEnabled(Document * document,FeatureType type,bool defaultValue)96 inline bool ContextFeatures::isEnabled(Document* document, FeatureType type, bool defaultValue) const
97 {
98 if (!m_client)
99 return defaultValue;
100 return m_client->isEnabled(document, type, defaultValue);
101 }
102
urlDidChange(Document * document)103 inline void ContextFeatures::urlDidChange(Document* document)
104 {
105 // FIXME: The original code, commented out below, is obviously
106 // wrong, but the seemingly correct fix of negating the test to
107 // the more logical 'if (!m_client)' crashes the renderer.
108 // See issue 294180
109 //
110 // if (m_client)
111 // return;
112 // m_client->urlDidChange(document);
113 }
114
115 } // namespace WebCore
116
117 #endif // ContextFeatures_h
118