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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WRADIOBUTTON_H_
#define WRADIOBUTTON_H_

#include <Wt/WAbstractToggleButton>

namespace Wt {

class WButtonGroup;

/*! \class WRadioButton Wt/WRadioButton Wt/WRadioButton
 *  \brief A user control that represents a radio button.
 *
 * Use a WButtonGroup to group together radio buttons that reflect
 * options that are mutually exclusive.
 *
 * Usage example:
 * \if cpp
 * \code
 * enum Vote { Republican = 1, Democrate = 2, NoVote = 10 };
 *
 * // use a group box as widget container for 3 radio buttons, with a title
 * Wt::WGroupBox *container = new Wt::WGroupBox("USA elections vote");
 *
 * // use a button group to logically group the 3 options
 * Wt::WButtonGroup *group = new Wt::WButtonGroup(this);
 *
 * Wt::WRadioButton *button;
 * button = new Wt::WRadioButton("I voted Republican", container);
 * new Wt::WBreak(container);
 * group->addButton(button, Republican);

 * button = new Wt::WRadioButton("I voted Democrat", container);
 * new Wt::WBreak(container);
 * group->addButton(button, Democrate);

 * button = new Wt::WRadioButton("I didn't vote", container);
 * new Wt::WBreak(container);
 * group->addButton(button, NoVote);
 *
 * group->setCheckedButton(group->button(NoVote));
 * \endcode
 * \elseif java
 * \code
 * enum Vote { Republican, Democrate, NoVote };
 *
 * // use a group box as widget container for 3 radio buttons, with a title
 * WGroupBox container = new WGroupBox("USA elections vote");
		 
 * // use a button group to logically group the 3 options
 * WButtonGroup group = new WButtonGroup(this);
		 
 * WRadioButton button;
 * button = new WRadioButton("I voted Republican", container);
 * new WBreak(container);
 * group.addButton(button, Vote.Republican.ordinal());
 * button = new WRadioButton("I voted Democrat", container);
 * new WBreak(container);
 * group.addButton(button, Vote.Democrate.ordinal());

 * button = new WRadioButton("I didn't vote", container);
 * new WBreak(container);
 * group.addButton(button, Vote.NoVote.ordinal());
		 
 * group.setCheckedButton(group.button(Vote.NoVote.ordinal()));	
 * \endcode
 * \endif
 *
 * %WRadioButton is an \link WWidget::setInline(bool) inline \endlink widget.
 *
 * <h3>CSS</h3>
 *
 * This widget corresponds to the HTML <tt>&lt;input
 * type="radio"&gt;</tt> tag.  When a label is specified, the input
 * element is nested in a <tt>&lt;label&gt;</tt>.
 *
 * This widget does not provide styling, and can be styled using
 * inline or external CSS as appropriate.
 *
 * \sa WAbstractToggleButton, WButtonGroup
 */
class WT_API WRadioButton : public WAbstractToggleButton
{
public:
  /*! \brief Creates an unchecked radio button with empty label and optional
   *         parent.
   */
  WRadioButton(WContainerWidget *parent = 0);

  /*! \brief Creates an unchecked radio button with given text and optional
   *         parent.
   */
  WRadioButton(const WString& text, WContainerWidget *parent = 0);

  /*! \brief Destructor.
   */
  ~WRadioButton();

  /*! \brief Returns the button group.
   *
   * Returns the button group to which this button belongs.
   *
   * \sa WButtonGroup::addButton(WRadioButton *, int)
   */
  WButtonGroup *group() const { return buttonGroup_; }

private:
  WButtonGroup *buttonGroup_;

  void setGroup(WButtonGroup *buttonGroup);
  friend class WButtonGroup;

protected:
  virtual void updateInput(DomElement& input, bool all);
  virtual void getFormObjects(FormObjectsMap& formObjects);

  virtual void setFormData(const FormData& formData);
};

}

#endif // WRADIOBUTTON_H_