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      1 /*
      2  * Copyright (c) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/html/HTMLOutputElement.h"
     33 
     34 #include "HTMLNames.h"
     35 #include "bindings/v8/ExceptionStatePlaceholder.h"
     36 
     37 namespace WebCore {
     38 
     39 inline HTMLOutputElement::HTMLOutputElement(const QualifiedName& tagName, Document* document, HTMLFormElement* form)
     40     : HTMLFormControlElement(tagName, document, form)
     41     , m_isDefaultValueMode(true)
     42     , m_isSetTextContentInProgress(false)
     43     , m_defaultValue("")
     44     , m_tokens(DOMSettableTokenList::create())
     45 {
     46     ScriptWrappable::init(this);
     47 }
     48 
     49 PassRefPtr<HTMLOutputElement> HTMLOutputElement::create(const QualifiedName& tagName, Document* document, HTMLFormElement* form)
     50 {
     51     return adoptRef(new HTMLOutputElement(tagName, document, form));
     52 }
     53 
     54 const AtomicString& HTMLOutputElement::formControlType() const
     55 {
     56     DEFINE_STATIC_LOCAL(const AtomicString, output, ("output", AtomicString::ConstructFromLiteral));
     57     return output;
     58 }
     59 
     60 bool HTMLOutputElement::supportsFocus() const
     61 {
     62     return HTMLElement::supportsFocus();
     63 }
     64 
     65 void HTMLOutputElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     66 {
     67     if (name == HTMLNames::forAttr)
     68         setFor(value);
     69     else
     70         HTMLFormControlElement::parseAttribute(name, value);
     71 }
     72 
     73 DOMSettableTokenList* HTMLOutputElement::htmlFor() const
     74 {
     75     return m_tokens.get();
     76 }
     77 
     78 void HTMLOutputElement::setFor(const String& value)
     79 {
     80     m_tokens->setValue(value);
     81 }
     82 
     83 void HTMLOutputElement::childrenChanged(bool createdByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
     84 {
     85     HTMLFormControlElement::childrenChanged(createdByParser, beforeChange, afterChange, childCountDelta);
     86 
     87     if (createdByParser || m_isSetTextContentInProgress) {
     88         m_isSetTextContentInProgress = false;
     89         return;
     90     }
     91 
     92     if (m_isDefaultValueMode)
     93         m_defaultValue = textContent();
     94 }
     95 
     96 void HTMLOutputElement::reset()
     97 {
     98     // The reset algorithm for output elements is to set the element's
     99     // value mode flag to "default" and then to set the element's textContent
    100     // attribute to the default value.
    101     m_isDefaultValueMode = true;
    102     if (m_defaultValue == value())
    103         return;
    104     setTextContentInternal(m_defaultValue);
    105 }
    106 
    107 String HTMLOutputElement::value() const
    108 {
    109     return textContent();
    110 }
    111 
    112 void HTMLOutputElement::setValue(const String& value)
    113 {
    114     // The value mode flag set to "value" when the value attribute is set.
    115     m_isDefaultValueMode = false;
    116     if (value == this->value())
    117         return;
    118     setTextContentInternal(value);
    119 }
    120 
    121 String HTMLOutputElement::defaultValue() const
    122 {
    123     return m_defaultValue;
    124 }
    125 
    126 void HTMLOutputElement::setDefaultValue(const String& value)
    127 {
    128     if (m_defaultValue == value)
    129         return;
    130     m_defaultValue = value;
    131     // The spec requires the value attribute set to the default value
    132     // when the element's value mode flag to "default".
    133     if (m_isDefaultValueMode)
    134         setTextContentInternal(value);
    135 }
    136 
    137 void HTMLOutputElement::setTextContentInternal(const String& value)
    138 {
    139     ASSERT(!m_isSetTextContentInProgress);
    140     m_isSetTextContentInProgress = true;
    141     setTextContent(value, IGNORE_EXCEPTION);
    142 }
    143 
    144 } // namespace
    145