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      1 /*
      2  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #include "config.h"
     22 #include "CheckedRadioButtons.h"
     23 
     24 #include "HTMLInputElement.h"
     25 
     26 namespace WebCore {
     27 
     28 void CheckedRadioButtons::addButton(HTMLFormControlElement* element)
     29 {
     30     // We only want to add radio buttons.
     31     if (!element->isRadioButton())
     32         return;
     33 
     34     // Without a name, there is no group.
     35     if (element->name().isEmpty())
     36         return;
     37 
     38     HTMLInputElement* inputElement = static_cast<HTMLInputElement*>(element);
     39 
     40     // We only track checked buttons.
     41     if (!inputElement->checked())
     42         return;
     43 
     44     if (!m_nameToCheckedRadioButtonMap)
     45         m_nameToCheckedRadioButtonMap.set(new NameToInputMap);
     46 
     47     pair<NameToInputMap::iterator, bool> result = m_nameToCheckedRadioButtonMap->add(element->name().impl(), inputElement);
     48     if (result.second)
     49         return;
     50 
     51     HTMLInputElement* oldCheckedButton = result.first->second;
     52     if (oldCheckedButton == inputElement)
     53         return;
     54 
     55     result.first->second = inputElement;
     56     oldCheckedButton->setChecked(false);
     57 }
     58 
     59 HTMLInputElement* CheckedRadioButtons::checkedButtonForGroup(const AtomicString& name) const
     60 {
     61     if (!m_nameToCheckedRadioButtonMap)
     62         return 0;
     63 
     64     m_nameToCheckedRadioButtonMap->checkConsistency();
     65 
     66     return m_nameToCheckedRadioButtonMap->get(name.impl());
     67 }
     68 
     69 void CheckedRadioButtons::removeButton(HTMLFormControlElement* element)
     70 {
     71     if (element->name().isEmpty() || !m_nameToCheckedRadioButtonMap)
     72         return;
     73 
     74     m_nameToCheckedRadioButtonMap->checkConsistency();
     75 
     76     NameToInputMap::iterator it = m_nameToCheckedRadioButtonMap->find(element->name().impl());
     77     if (it == m_nameToCheckedRadioButtonMap->end() || it->second != element)
     78         return;
     79 
     80     InputElement* inputElement = element->toInputElement();
     81     ASSERT_UNUSED(inputElement, inputElement);
     82     ASSERT(inputElement->isChecked());
     83     ASSERT(element->isRadioButton());
     84 
     85     m_nameToCheckedRadioButtonMap->remove(it);
     86     if (m_nameToCheckedRadioButtonMap->isEmpty())
     87         m_nameToCheckedRadioButtonMap.clear();
     88 }
     89 
     90 } // namespace
     91