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27 #ifndef ContextFeatures_h
28 #define ContextFeatures_h
30 #include "platform/RefCountedSupplement.h"
34 class ContextFeaturesClient;
39 class ContextFeatures final : public GarbageCollectedFinalized<ContextFeatures>, public HeapSupplement<Page> {
40 USING_GARBAGE_COLLECTED_MIXIN(ContextFeatures);
42 typedef HeapSupplement<Page> SupplementType;
44 class ContextFeatures : public RefCountedSupplement<Page, ContextFeatures> {
46 typedef RefCountedSupplement<Page, ContextFeatures> SupplementType;
52 FeatureTypeSize // Should be the last entry.
55 static const char* supplementName();
56 static ContextFeatures* defaultSwitch();
57 static PassRefPtrWillBeRawPtr<ContextFeatures> create(PassOwnPtr<ContextFeaturesClient>);
59 static bool pagePopupEnabled(Document*);
60 static bool mutationEventsEnabled(Document*);
61 static bool pushStateEnabled(Document*);
63 bool isEnabled(Document*, FeatureType, bool) const;
64 void urlDidChange(Document*);
67 virtual void trace(Visitor* visitor) override { HeapSupplement<Page>::trace(visitor); }
71 explicit ContextFeatures(PassOwnPtr<ContextFeaturesClient> client)
75 OwnPtr<ContextFeaturesClient> m_client;
78 class ContextFeaturesClient {
79 WTF_MAKE_FAST_ALLOCATED;
81 static PassOwnPtr<ContextFeaturesClient> empty();
83 virtual ~ContextFeaturesClient() { }
84 virtual bool isEnabled(Document*, ContextFeatures::FeatureType, bool defaultValue) { return defaultValue; }
85 virtual void urlDidChange(Document*) { }
88 void provideContextFeaturesTo(Page&, PassOwnPtr<ContextFeaturesClient>);
89 void provideContextFeaturesToDocumentFrom(Document&, Page&);
91 inline PassRefPtrWillBeRawPtr<ContextFeatures> ContextFeatures::create(PassOwnPtr<ContextFeaturesClient> client)
93 return adoptRefWillBeNoop(new ContextFeatures(client));
96 inline bool ContextFeatures::isEnabled(Document* document, FeatureType type, bool defaultValue) const
100 return m_client->isEnabled(document, type, defaultValue);
103 inline void ContextFeatures::urlDidChange(Document* document)
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.
112 // m_client->urlDidChange(document);
117 #endif // ContextFeatures_h