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

 * 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 "adwaitascrollbardata.h"

#include <QHoverEvent>

#include <QScrollBar>

#include <QStyleOptionSlider>

Q_GUI_EXPORT QStyleOptionSlider qt_qscrollbarStyleOption(QScrollBar*);

namespace Adwaita

{

    //______________________________________________

    ScrollBarData::ScrollBarData( QObject* parent, QWidget* target, int duration ):

        WidgetStateData( parent, target, duration ),

        _position( -1, -1 )

    {

        target->installEventFilter( this );

        _addLineData._animation = new Animation( duration, this );

        _subLineData._animation = new Animation( duration, this );

        _grooveData._animation = new Animation( duration, this );

        connect( addLineAnimation().data(), SIGNAL(finished()), SLOT(clearAddLineRect()) );

        connect( subLineAnimation().data(), SIGNAL(finished()), SLOT(clearSubLineRect()) );

        // setup animation

        setupAnimation( addLineAnimation(), "addLineOpacity" );

        setupAnimation( subLineAnimation(), "subLineOpacity" );

        setupAnimation( grooveAnimation(), "grooveOpacity" );

    }

    //______________________________________________

    bool ScrollBarData::eventFilter( QObject* object, QEvent* event )

    {

        if( object != target().data() )

        { return WidgetStateData::eventFilter( object, event ); }

        // check event type

        switch( event->type() )

        {

            case QEvent::HoverEnter:

            setGrooveHovered(true);

            grooveAnimation().data()->setDirection( Animation::Forward );

            if( !grooveAnimation().data()->isRunning() ) grooveAnimation().data()->start();

            case QEvent::HoverMove:

            hoverMoveEvent( object, event );

            break;

            case QEvent::HoverLeave:

            setGrooveHovered(false);

            grooveAnimation().data()->setDirection( Animation::Backward );

            if( !grooveAnimation().data()->isRunning() ) grooveAnimation().data()->start();

            hoverLeaveEvent( object, event );

            break;

            default: break;

        }

        return WidgetStateData::eventFilter( object, event );

    }

    //______________________________________________

    const Animation::Pointer& ScrollBarData::animation( QStyle::SubControl subcontrol ) const

    {

        switch( subcontrol )

        {

            default:

            case QStyle::SC_ScrollBarSlider:

            return animation();

            case QStyle::SC_ScrollBarAddLine:

            return addLineAnimation();

            case QStyle::SC_ScrollBarSubLine:

            return subLineAnimation();

            case QStyle::SC_ScrollBarGroove:

            return grooveAnimation();

        }

    }

    //______________________________________________

    qreal ScrollBarData::opacity( QStyle::SubControl subcontrol ) const

    {

        switch( subcontrol )

        {

            default:

            case QStyle::SC_ScrollBarSlider:

            return opacity();

            case QStyle::SC_ScrollBarAddLine:

            return addLineOpacity();

            case QStyle::SC_ScrollBarSubLine:

            return subLineOpacity();

            case QStyle::SC_ScrollBarGroove:

            return grooveOpacity();

        }

    }

    //______________________________________________

    void ScrollBarData::hoverMoveEvent(  QObject* object, QEvent* event )

    {

        // try cast object to scrollbar

        QScrollBar* scrollBar( qobject_cast<QScrollBar*>( object ) );

        if( !scrollBar || scrollBar->isSliderDown() ) return;

        // retrieve scrollbar option

        QStyleOptionSlider opt( qt_qscrollbarStyleOption( scrollBar ) );

        // cast event

        QHoverEvent *hoverEvent = static_cast<QHoverEvent*>(event);

        QStyle::SubControl hoverControl = scrollBar->style()->hitTestComplexControl(QStyle::CC_ScrollBar, &opt, hoverEvent->pos(), scrollBar);

        // update hover state

        updateAddLineArrow( hoverControl );

        updateSubLineArrow( hoverControl );

        // store position

        _position = hoverEvent->pos();

    }

    //______________________________________________

    void ScrollBarData::hoverLeaveEvent(  QObject*, QEvent* )

    {

        // reset hover state

        updateSubLineArrow( QStyle::SC_None );

        updateAddLineArrow( QStyle::SC_None );

        // reset mouse position

        _position = QPoint( -1, -1 );

    }

    //_____________________________________________________________________

    void ScrollBarData::updateSubLineArrow( QStyle::SubControl hoverControl )

    {

        if( hoverControl == QStyle::SC_ScrollBarSubLine )

        {

            if( !subLineArrowHovered() )

            {

                setSubLineArrowHovered( true );

                if( enabled() )

                {

                    subLineAnimation().data()->setDirection( Animation::Forward );

                    if( !subLineAnimation().data()->isRunning() ) subLineAnimation().data()->start();

                } else setDirty();

             }

        } else {

            if( subLineArrowHovered() )

            {

                setSubLineArrowHovered( false );

                if( enabled() )

                {

                    subLineAnimation().data()->setDirection( Animation::Backward );

                    if( !subLineAnimation().data()->isRunning() ) subLineAnimation().data()->start();

                } else setDirty();

            }

        }

    }

    //_____________________________________________________________________

    void ScrollBarData::updateAddLineArrow( QStyle::SubControl hoverControl )

    {

        if( hoverControl == QStyle::SC_ScrollBarAddLine )

        {

            if( !addLineArrowHovered() )

            {

                setAddLineArrowHovered( true );

                if( enabled() )

                {

                    addLineAnimation().data()->setDirection( Animation::Forward );

                    if( !addLineAnimation().data()->isRunning() ) addLineAnimation().data()->start();

                } else setDirty();

            }

        } else {

            if( addLineArrowHovered() )

            {

                setAddLineArrowHovered( false );

                if( enabled() )

                {

                    addLineAnimation().data()->setDirection( Animation::Backward );

                    if( !addLineAnimation().data()->isRunning() ) addLineAnimation().data()->start();

                } else setDirty();

            }

        }

    }

}