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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/HTMLLegendElement.h"
     27 
     28 #include "HTMLNames.h"
     29 #include "core/dom/NodeTraversal.h"
     30 #include "core/html/HTMLFieldSetElement.h"
     31 #include "core/html/HTMLFormControlElement.h"
     32 
     33 namespace WebCore {
     34 
     35 using namespace HTMLNames;
     36 
     37 
     38 inline HTMLLegendElement::HTMLLegendElement(const QualifiedName& tagName, Document* document)
     39     : HTMLElement(tagName, document)
     40 {
     41     ASSERT(hasTagName(legendTag));
     42     ScriptWrappable::init(this);
     43 }
     44 
     45 PassRefPtr<HTMLLegendElement> HTMLLegendElement::create(const QualifiedName& tagName, Document* document)
     46 {
     47     return adoptRef(new HTMLLegendElement(tagName, document));
     48 }
     49 
     50 HTMLFormControlElement* HTMLLegendElement::associatedControl()
     51 {
     52     // Check if there's a fieldset belonging to this legend.
     53     Element* fieldset = parentElement();
     54     while (fieldset && !fieldset->hasTagName(fieldsetTag))
     55         fieldset = fieldset->parentElement();
     56     if (!fieldset)
     57         return 0;
     58 
     59     // Find first form element inside the fieldset that is not a legend element.
     60     // FIXME: Should we consider tabindex?
     61     Element* element = fieldset;
     62     while ((element = ElementTraversal::next(element, fieldset))) {
     63         if (element->isFormControlElement())
     64             return toHTMLFormControlElement(element);
     65     }
     66 
     67     return 0;
     68 }
     69 
     70 void HTMLLegendElement::focus(bool, FocusDirection direction)
     71 {
     72     if (isFocusable())
     73         Element::focus(true, direction);
     74 
     75     // To match other browsers' behavior, never restore previous selection.
     76     if (HTMLFormControlElement* control = associatedControl())
     77         control->focus(false, direction);
     78 }
     79 
     80 void HTMLLegendElement::accessKeyAction(bool sendMouseEvents)
     81 {
     82     if (HTMLFormControlElement* control = associatedControl())
     83         control->accessKeyAction(sendMouseEvents);
     84 }
     85 
     86 HTMLFormElement* HTMLLegendElement::virtualForm() const
     87 {
     88     // According to the specification, If the legend has a fieldset element as
     89     // its parent, then the form attribute must return the same value as the
     90     // form attribute on that fieldset element. Otherwise, it must return null.
     91     ContainerNode* fieldset = parentNode();
     92     if (!fieldset || !fieldset->hasTagName(fieldsetTag))
     93         return 0;
     94 
     95     return static_cast<HTMLFieldSetElement*>(fieldset)->form();
     96 }
     97 
     98 } // namespace
     99