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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  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      5  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
      6  *           (C) 2006 Alexey Proskuryakov (ap (at) nypop.com)
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  *
     23  */
     24 
     25 #include "config.h"
     26 #include "core/html/HTMLFieldSetElement.h"
     27 
     28 #include "HTMLNames.h"
     29 #include "core/dom/NodeTraversal.h"
     30 #include "core/html/HTMLCollection.h"
     31 #include "core/html/HTMLLegendElement.h"
     32 #include "core/html/HTMLObjectElement.h"
     33 #include "core/rendering/RenderFieldset.h"
     34 #include "wtf/StdLibExtras.h"
     35 
     36 namespace WebCore {
     37 
     38 using namespace HTMLNames;
     39 
     40 inline HTMLFieldSetElement::HTMLFieldSetElement(const QualifiedName& tagName, Document* document, HTMLFormElement* form)
     41     : HTMLFormControlElement(tagName, document, form)
     42     , m_documentVersion(0)
     43 {
     44     ASSERT(hasTagName(fieldsetTag));
     45     ScriptWrappable::init(this);
     46 }
     47 
     48 PassRefPtr<HTMLFieldSetElement> HTMLFieldSetElement::create(const QualifiedName& tagName, Document* document, HTMLFormElement* form)
     49 {
     50     return adoptRef(new HTMLFieldSetElement(tagName, document, form));
     51 }
     52 
     53 void HTMLFieldSetElement::invalidateDisabledStateUnder(Element* base)
     54 {
     55     for (Element* element = ElementTraversal::firstWithin(base); element; element = ElementTraversal::next(element, base)) {
     56         if (element->isFormControlElement())
     57             toHTMLFormControlElement(element)->ancestorDisabledStateWasChanged();
     58     }
     59 }
     60 
     61 void HTMLFieldSetElement::disabledAttributeChanged()
     62 {
     63     // This element must be updated before the style of nodes in its subtree gets recalculated.
     64     HTMLFormControlElement::disabledAttributeChanged();
     65     invalidateDisabledStateUnder(this);
     66 }
     67 
     68 void HTMLFieldSetElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
     69 {
     70     HTMLFormControlElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     71     for (Element* element = ElementTraversal::firstWithin(this); element; element = ElementTraversal::nextSkippingChildren(element, this)) {
     72         if (element->hasTagName(legendTag))
     73             invalidateDisabledStateUnder(element);
     74     }
     75 }
     76 
     77 bool HTMLFieldSetElement::supportsFocus() const
     78 {
     79     return HTMLElement::supportsFocus();
     80 }
     81 
     82 const AtomicString& HTMLFieldSetElement::formControlType() const
     83 {
     84     DEFINE_STATIC_LOCAL(const AtomicString, fieldset, ("fieldset", AtomicString::ConstructFromLiteral));
     85     return fieldset;
     86 }
     87 
     88 RenderObject* HTMLFieldSetElement::createRenderer(RenderStyle*)
     89 {
     90     return new RenderFieldset(this);
     91 }
     92 
     93 HTMLLegendElement* HTMLFieldSetElement::legend() const
     94 {
     95     for (Element* child = ElementTraversal::firstWithin(this); child; child = ElementTraversal::nextSkippingChildren(child, this)) {
     96         if (child->hasTagName(legendTag))
     97             return static_cast<HTMLLegendElement*>(child);
     98     }
     99     return 0;
    100 }
    101 
    102 PassRefPtr<HTMLCollection> HTMLFieldSetElement::elements()
    103 {
    104     return ensureCachedHTMLCollection(FormControls);
    105 }
    106 
    107 void HTMLFieldSetElement::refreshElementsIfNeeded() const
    108 {
    109     uint64_t docVersion = document()->domTreeVersion();
    110     if (m_documentVersion == docVersion)
    111         return;
    112 
    113     m_documentVersion = docVersion;
    114 
    115     m_associatedElements.clear();
    116 
    117     for (Element* element = ElementTraversal::firstWithin(this); element; element = ElementTraversal::next(element, this)) {
    118         if (element->hasTagName(objectTag)) {
    119             m_associatedElements.append(static_cast<HTMLObjectElement*>(element));
    120             continue;
    121         }
    122 
    123         if (!element->isFormControlElement())
    124             continue;
    125 
    126         m_associatedElements.append(toHTMLFormControlElement(element));
    127     }
    128 }
    129 
    130 const Vector<FormAssociatedElement*>& HTMLFieldSetElement::associatedElements() const
    131 {
    132     refreshElementsIfNeeded();
    133     return m_associatedElements;
    134 }
    135 
    136 unsigned HTMLFieldSetElement::length() const
    137 {
    138     refreshElementsIfNeeded();
    139     unsigned len = 0;
    140     for (unsigned i = 0; i < m_associatedElements.size(); ++i)
    141         if (m_associatedElements[i]->isEnumeratable())
    142             ++len;
    143     return len;
    144 }
    145 
    146 } // namespace
    147