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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  * Copyright (C) 2003, 2008, 2010 Apple Inc. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  *
     21  */
     22 
     23 #ifndef HTMLLinkElement_h
     24 #define HTMLLinkElement_h
     25 
     26 #include "CSSStyleSheet.h"
     27 #include "CachedResourceClient.h"
     28 #include "CachedResourceHandle.h"
     29 #include "HTMLElement.h"
     30 #include "Timer.h"
     31 
     32 namespace WebCore {
     33 
     34 class CachedCSSStyleSheet;
     35 class CachedResource;
     36 class KURL;
     37 
     38 class HTMLLinkElement : public HTMLElement, public CachedResourceClient {
     39 public:
     40     struct RelAttribute {
     41         bool m_isStyleSheet;
     42         bool m_isIcon;
     43         bool m_isAlternate;
     44         bool m_isDNSPrefetch;
     45 #ifdef ANDROID_APPLE_TOUCH_ICON
     46         bool m_isTouchIcon;
     47         bool m_isPrecomposedTouchIcon;
     48 #endif
     49 #if ENABLE(LINK_PREFETCH)
     50         bool m_isLinkPrefetch;
     51         bool m_isLinkSubresource;
     52 #endif
     53 
     54         RelAttribute()
     55             : m_isStyleSheet(false)
     56             , m_isIcon(false)
     57             , m_isAlternate(false)
     58             , m_isDNSPrefetch(false)
     59 #if ENABLE(LINK_PREFETCH)
     60             , m_isLinkPrefetch(false)
     61             , m_isLinkSubresource(false)
     62 #endif
     63             {
     64             }
     65     };
     66 
     67     static PassRefPtr<HTMLLinkElement> create(const QualifiedName&, Document*, bool createdByParser);
     68     virtual ~HTMLLinkElement();
     69 
     70     KURL href() const;
     71     String rel() const;
     72 
     73     virtual String target() const;
     74 
     75     String type() const;
     76 
     77     StyleSheet* sheet() const;
     78 
     79     bool isLoading() const;
     80 
     81     bool isDisabled() const { return m_disabledState == Disabled; }
     82     bool isEnabledViaScript() const { return m_disabledState == EnabledViaScript; }
     83     bool isIcon() const { return m_relAttribute.m_isIcon; }
     84 
     85 private:
     86     virtual void parseMappedAttribute(Attribute*);
     87 
     88 #if ENABLE(LINK_PREFETCH)
     89     void onloadTimerFired(Timer<HTMLLinkElement>*);
     90 #endif
     91     bool checkBeforeLoadEvent();
     92     void process();
     93     static void processCallback(Node*);
     94 
     95     virtual void insertedIntoDocument();
     96     virtual void removedFromDocument();
     97 
     98     // from CachedResourceClient
     99     virtual void setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CachedCSSStyleSheet* sheet);
    100 #if ENABLE(LINK_PREFETCH)
    101     virtual void notifyFinished(CachedResource*);
    102 #endif
    103     virtual bool sheetLoaded();
    104 
    105     bool isAlternate() const { return m_disabledState == Unset && m_relAttribute.m_isAlternate; }
    106 
    107     void setDisabledState(bool _disabled);
    108 
    109     virtual bool isURLAttribute(Attribute*) const;
    110 
    111 public:
    112     static void tokenizeRelAttribute(const AtomicString& value, RelAttribute&);
    113 
    114 private:
    115     virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const;
    116 
    117     virtual void finishParsingChildren();
    118 
    119     enum PendingSheetType { None, NonBlocking, Blocking };
    120     void addPendingSheet(PendingSheetType);
    121     void removePendingSheet();
    122 
    123 private:
    124     HTMLLinkElement(const QualifiedName&, Document*, bool createdByParser);
    125 
    126     enum DisabledState {
    127         Unset,
    128         EnabledViaScript,
    129         Disabled
    130     };
    131 
    132     CachedResourceHandle<CachedCSSStyleSheet> m_cachedSheet;
    133     RefPtr<CSSStyleSheet> m_sheet;
    134 #if ENABLE(LINK_PREFETCH)
    135     CachedResourceHandle<CachedResource> m_cachedLinkResource;
    136     Timer<HTMLLinkElement> m_onloadTimer;
    137 #endif
    138     KURL m_url;
    139     String m_type;
    140     String m_media;
    141     DisabledState m_disabledState;
    142     RelAttribute m_relAttribute;
    143     bool m_loading;
    144     bool m_createdByParser;
    145     bool m_isInShadowTree;
    146 
    147     PendingSheetType m_pendingSheetType;
    148 };
    149 
    150 } //namespace
    151 
    152 #endif
    153