/*************************************************************************

 * Copyright (C) 2014 by Hugo Pereira Da Costa <hugo.pereira@free.fr>    *

 *                                                                       *

 * This program is free software; you can redistribute it and/or modify  *

 * it under the terms of the GNU General Public License as published by  *

 * the Free Software Foundation; either version 2 of the License, or     *

 * (at your option) any later version.                                   *

 *                                                                       *

 * This program 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 General Public License for more details.                          *

 *                                                                       *

 * You should have received a copy of the GNU General Public License     *

 * along with this program; if not, write to the                         *

 * Free Software Foundation, Inc.,                                       *

 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *

 *************************************************************************/

#include "adwaitamnemonics.h"

#include <QKeyEvent>

#include <QWidget>

namespace Adwaita

{

    //____________________________________________________

    void Mnemonics::setMode( int mode )

    {

        switch( mode )

        {

            case StyleConfigData::MN_NEVER:

            qApp->removeEventFilter( this );

            setEnabled( false );

            break;

            default:

            case StyleConfigData::MN_ALWAYS:

            qApp->removeEventFilter( this );

            setEnabled( true );

            break;

            case StyleConfigData::MN_AUTO:

            qApp->removeEventFilter( this );

            qApp->installEventFilter( this );

            setEnabled( false );

            break;

        }

        return;

    }

    //____________________________________________________

    bool Mnemonics::eventFilter( QObject*, QEvent* event )

    {

        switch( event->type() )

        {

            case QEvent::KeyPress:

            if( static_cast<QKeyEvent*>(event)->key() == Qt::Key_Alt )

            { setEnabled( true ); }

            break;

            case QEvent::KeyRelease:

            if( static_cast<QKeyEvent*>(event)->key() == Qt::Key_Alt )

            { setEnabled( false ); }

            break;

            #if QT_VERSION >= 0x050000

            case QEvent::ApplicationStateChange:

            { setEnabled( false ); }

            break;

            #endif

            default: break;

        }

        return false;

    }

    //____________________________________________________

    void Mnemonics::setEnabled( bool value )

    {

        if( _enabled == value ) return;

        _enabled = value;

        // update all top level widgets

        foreach( QWidget* widget, qApp->topLevelWidgets() )

        { widget->update(); }

    }

}