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      1 /*
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2004, 2006, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #ifndef MediaList_h
     22 #define MediaList_h
     23 
     24 #include "core/dom/ExceptionCode.h"
     25 #include "platform/heap/Handle.h"
     26 #include "wtf/Forward.h"
     27 #include "wtf/PassRefPtr.h"
     28 #include "wtf/RefCounted.h"
     29 #include "wtf/Vector.h"
     30 #include "wtf/text/WTFString.h"
     31 
     32 namespace WebCore {
     33 
     34 class CSSRule;
     35 class CSSStyleSheet;
     36 class Document;
     37 class ExceptionState;
     38 class MediaList;
     39 class MediaQuery;
     40 
     41 class MediaQuerySet : public RefCountedWillBeGarbageCollected<MediaQuerySet> {
     42     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaQuerySet);
     43 public:
     44     static PassRefPtrWillBeRawPtr<MediaQuerySet> create()
     45     {
     46         return adoptRefWillBeNoop(new MediaQuerySet());
     47     }
     48     static PassRefPtrWillBeRawPtr<MediaQuerySet> create(const String& mediaString);
     49     static PassRefPtrWillBeRawPtr<MediaQuerySet> createOffMainThread(const String& mediaString);
     50 
     51     bool set(const String&);
     52     bool add(const String&);
     53     bool remove(const String&);
     54 
     55     void addMediaQuery(PassOwnPtrWillBeRawPtr<MediaQuery>);
     56 
     57     const WillBeHeapVector<OwnPtrWillBeMember<MediaQuery> >& queryVector() const { return m_queries; }
     58 
     59     String mediaText() const;
     60 
     61     PassRefPtrWillBeRawPtr<MediaQuerySet> copy() const { return adoptRefWillBeNoop(new MediaQuerySet(*this)); }
     62 
     63     void trace(Visitor*);
     64 
     65 private:
     66     MediaQuerySet();
     67     MediaQuerySet(const MediaQuerySet&);
     68 
     69     WillBeHeapVector<OwnPtrWillBeMember<MediaQuery> > m_queries;
     70 };
     71 
     72 class MediaList : public RefCountedWillBeGarbageCollectedFinalized<MediaList> {
     73 public:
     74     static PassRefPtrWillBeRawPtr<MediaList> create(MediaQuerySet* mediaQueries, CSSStyleSheet* parentSheet)
     75     {
     76         return adoptRefWillBeNoop(new MediaList(mediaQueries, parentSheet));
     77     }
     78     static PassRefPtrWillBeRawPtr<MediaList> create(MediaQuerySet* mediaQueries, CSSRule* parentRule)
     79     {
     80         return adoptRefWillBeNoop(new MediaList(mediaQueries, parentRule));
     81     }
     82 
     83     ~MediaList();
     84 
     85     unsigned length() const { return m_mediaQueries->queryVector().size(); }
     86     String item(unsigned index) const;
     87     void deleteMedium(const String& oldMedium, ExceptionState&);
     88     void appendMedium(const String& newMedium, ExceptionState&);
     89 
     90     String mediaText() const { return m_mediaQueries->mediaText(); }
     91     void setMediaText(const String&);
     92 
     93     // Not part of CSSOM.
     94     CSSRule* parentRule() const { return m_parentRule; }
     95     CSSStyleSheet* parentStyleSheet() const { return m_parentStyleSheet; }
     96 
     97 #if !ENABLE(OILPAN)
     98     void clearParentStyleSheet() { ASSERT(m_parentStyleSheet); m_parentStyleSheet = nullptr; }
     99     void clearParentRule() { ASSERT(m_parentRule); m_parentRule = nullptr; }
    100 #endif
    101 
    102     const MediaQuerySet* queries() const { return m_mediaQueries.get(); }
    103 
    104     void reattach(MediaQuerySet*);
    105 
    106     void trace(Visitor*);
    107 
    108 private:
    109     MediaList();
    110     MediaList(MediaQuerySet*, CSSStyleSheet* parentSheet);
    111     MediaList(MediaQuerySet*, CSSRule* parentRule);
    112 
    113     RefPtrWillBeMember<MediaQuerySet> m_mediaQueries;
    114     // Cleared in ~CSSStyleSheet destructor when oilpan is not enabled.
    115     RawPtrWillBeMember<CSSStyleSheet> m_parentStyleSheet;
    116     // Cleared in the ~CSSMediaRule and ~CSSImportRule destructors when oilpan is not enabled.
    117     RawPtrWillBeMember<CSSRule> m_parentRule;
    118 };
    119 
    120 // Adds message to inspector console whenever dpi or dpcm values are used for "screen" media.
    121 void reportMediaQueryWarningIfNeeded(Document*, const MediaQuerySet*);
    122 
    123 } // namespace
    124 
    125 #endif
    126