/*
    This file is part of the KDE Libraries

    Copyright (C) 2006 Pino Toscano <toscano.pino@tiscali.it>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB. If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef KBUTTONGROUP_H
#define KBUTTONGROUP_H

#include <kdeui_export.h>
#include <QtGui/QGroupBox>

class QAbstractButton;

/**
 * @short Group box with index of the selected button
 * KButtonGroup is a simple group box that can keep track of the current selected
 * button of the ones added to it.
 *
 * Use normally as you would with a QGroupBox.
 *
 * \image html kbuttongroup.png "KDE Button Group containing 3 KPushButtons"
 *
 * @author Pino Toscano <toscano.pino@tiscali.it>
 */
class KDEUI_EXPORT KButtonGroup : public QGroupBox
{
    Q_OBJECT

    Q_PROPERTY(int current READ selected WRITE setSelected NOTIFY changed USER true)

public:
    /**
     * Construct a new empty KGroupBox.
     */
    explicit KButtonGroup(QWidget* parent = 0);

    /**
     * Destroys the widget.
     */
    ~KButtonGroup();

    /**
     * Return the index of the selected QAbstractButton, among the QAbstractButton's
     * added to the widget.
     * @return the index of the selected button
     */
    int selected() const;

    /**
     * @return the index of @p button.
     * @since 4.3
     */
    int id(QAbstractButton* button) const;

public Q_SLOTS:
    /**
     * Select the \p id -th button
     */
    void setSelected(int id);

Q_SIGNALS:
    /**
     * The button with index \p id was clicked
     */
    void clicked(int id);
    /**
     * The button with index \p id was pressed
     */
    void pressed(int id);
    /**
     * The button with index \p id was released
     */
    void released(int id);
    /**
     * Emitted when anything (a click on a button, or calling setSelected())
     * change the id of the current selected. \p id is the index of the new
     * selected button.
     */
    void changed(int id);

protected:
    /**
     * Reimplemented from QGroupBox.
     */
    virtual void childEvent(QChildEvent* event);

private:
    Q_PRIVATE_SLOT(d, void slotClicked(int id))

    class Private;
    friend class Private;
    Private * const d;
};

#endif