WebCore/dom/CheckedRadioButtons.cpp

   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     return m_nameToCheckedRadioButtonMap->get(name.impl());
  65 }
  66
  67 void CheckedRadioButtons::removeButton(HTMLFormControlElement* element)
  68 {
  69     if (element->name().isEmpty() || !m_nameToCheckedRadioButtonMap)
  70         return;
  71
  72     NameToInputMap::iterator it = m_nameToCheckedRadioButtonMap->find(element->name().impl());
  73     if (it == m_nameToCheckedRadioButtonMap->end() || it->second != element)
  74         return;
  75
  76     InputElement* inputElement = toInputElement(element);
  77     ASSERT_UNUSED(inputElement, inputElement);
  78     ASSERT(inputElement->isChecked());
  79     ASSERT(element->isRadioButton());
  80
  81     m_nameToCheckedRadioButtonMap->remove(it);
  82     if (m_nameToCheckedRadioButtonMap->isEmpty())
  83         m_nameToCheckedRadioButtonMap.clear();
  84 }
  85
  86 } // namespace