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      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 "core/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:
     63     explicit ContextFeatures(ContextFeaturesClient* client)
     64         : m_client(client)
     65     { }
     66 
     67     virtual void hostDestroyed() OVERRIDE;
     68 
     69     ContextFeaturesClient* m_client;
     70 };
     71 
     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 
     83     virtual ~ContextFeaturesClient() { }
     84     virtual bool isEnabled(Document*, ContextFeatures::FeatureType, bool defaultValue) { return defaultValue; }
     85     virtual void urlDidChange(Document*) { }
     86 };
     87 
     88 void provideContextFeaturesTo(Page*, ContextFeaturesClient*);
     89 void provideContextFeaturesToDocumentFrom(Document*, Page*);
     90 
     91 inline PassRefPtr<ContextFeatures> ContextFeatures::create(ContextFeaturesClient* client)
     92 {
     93     return adoptRef(new ContextFeatures(client));
     94 }
     95 
     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 
    103 inline void ContextFeatures::urlDidChange(Document* document)
    104 {
    105     if (m_client)
    106         return;
    107     m_client->urlDidChange(document);
    108 }
    109 
    110 } // namespace WebCore
    111 
    112 #endif // ContextFeatures_h
    113