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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, 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 HTMLStyleElement_h
     24 #define HTMLStyleElement_h
     25 
     26 #include "core/dom/StyleElement.h"
     27 #include "core/html/HTMLElement.h"
     28 
     29 namespace WebCore {
     30 
     31 class HTMLStyleElement;
     32 class StyleSheet;
     33 
     34 template<typename T> class EventSender;
     35 typedef EventSender<HTMLStyleElement> StyleEventSender;
     36 
     37 class HTMLStyleElement FINAL : public HTMLElement, private StyleElement {
     38 public:
     39     static PassRefPtr<HTMLStyleElement> create(const QualifiedName&, Document*, bool createdByParser);
     40     virtual ~HTMLStyleElement();
     41 
     42     void setType(const AtomicString&);
     43 
     44     bool scoped() const;
     45     void setScoped(bool);
     46     ContainerNode* scopingNode();
     47     bool isRegisteredAsScoped() const
     48     {
     49         // Note: We cannot rely on the 'scoped' attribute still being present when this method is invoked.
     50         // Therefore we cannot rely on scoped()!
     51         if (m_scopedStyleRegistrationState == NotRegistered)
     52             return false;
     53         return true;
     54     }
     55 
     56     bool isRegisteredInShadowRoot() const
     57     {
     58         return m_scopedStyleRegistrationState == RegisteredInShadowRoot;
     59     }
     60 
     61     using StyleElement::sheet;
     62 
     63     bool disabled() const;
     64     void setDisabled(bool);
     65 
     66     void dispatchPendingEvent(StyleEventSender*);
     67     static void dispatchPendingLoadEvents();
     68 
     69 private:
     70     HTMLStyleElement(const QualifiedName&, Document*, bool createdByParser);
     71 
     72     // overload from HTMLElement
     73     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     74     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     75     virtual void didNotifySubtreeInsertions(ContainerNode*) OVERRIDE;
     76     virtual void removedFrom(ContainerNode*) OVERRIDE;
     77     virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0);
     78 
     79     virtual void finishParsingChildren();
     80 
     81     virtual bool isLoading() const { return StyleElement::isLoading(); }
     82     virtual bool sheetLoaded() { return StyleElement::sheetLoaded(document()); }
     83     virtual void notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred);
     84     virtual void startLoadingDynamicSheet() { StyleElement::startLoadingDynamicSheet(document()); }
     85 
     86     virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const;
     87 
     88     virtual const AtomicString& media() const;
     89     virtual const AtomicString& type() const;
     90 
     91     void scopedAttributeChanged(bool);
     92     void registerWithScopingNode(bool);
     93     void unregisterWithScopingNode(ContainerNode*);
     94 
     95     bool m_firedLoad;
     96     bool m_loadedSheet;
     97 
     98     enum ScopedStyleRegistrationState {
     99         NotRegistered,
    100         RegisteredAsScoped,
    101         RegisteredInShadowRoot
    102     };
    103     ScopedStyleRegistrationState m_scopedStyleRegistrationState;
    104 };
    105 
    106 inline bool isHTMLStyleElement(Node* node)
    107 {
    108     ASSERT(node);
    109     return node->hasTagName(HTMLNames::styleTag);
    110 }
    111 
    112 inline HTMLStyleElement* toHTMLStyleElement(Node* node)
    113 {
    114     ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(HTMLNames::styleTag));
    115     return static_cast<HTMLStyleElement*>(node);
    116 }
    117 
    118 } //namespace
    119 
    120 #endif
    121