/*************************************************************************
 * 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 "darklyscrollbarengine.h"

#include <QEvent>

namespace Darkly
{

//____________________________________________________________
bool ScrollBarEngine::registerWidget(QWidget *widget, AnimationModes mode)
{
    // check widget
    if (!widget)
        return false;

    // only handle hover and focus
    if (mode & AnimationHover && !dataMap(AnimationHover).contains(widget)) {
        dataMap(AnimationHover).insert(widget, new ScrollBarData(this, widget, duration()), enabled());
    }
    if (mode & AnimationFocus && !dataMap(AnimationFocus).contains(widget)) {
        dataMap(AnimationFocus).insert(widget, new WidgetStateData(this, widget, duration()), enabled());
    }

    // connect destruction signal
    connect(widget, SIGNAL(destroyed(QObject *)), this, SLOT(unregisterWidget(QObject *)), Qt::UniqueConnection);

    return true;
}

//____________________________________________________________
bool ScrollBarEngine::isAnimated(const QObject *object, AnimationMode mode, QStyle::SubControl control)
{
    if (mode == AnimationHover) {
        if (DataMap<WidgetStateData>::Value data = this->data(object, AnimationHover)) {
            const ScrollBarData *scrollBarData(static_cast<const ScrollBarData *>(data.data()));
            const Animation::Pointer &animation = scrollBarData->animation(control);
            return animation.data()->isRunning();

        } else
            return false;

    } else if (control == QStyle::SC_ScrollBarSlider) {
        return WidgetStateEngine::isAnimated(object, mode);

    } else
        return false;
}

//____________________________________________________________
AnimationMode ScrollBarEngine::animationMode(const QObject *object, QStyle::SubControl control)
{
    // enable state
    if (isAnimated(object, AnimationHover, control))
        return AnimationHover;
    else if (isAnimated(object, AnimationFocus, control))
        return AnimationFocus;
    else if (isAnimated(object, AnimationPressed, control))
        return AnimationPressed;
    else
        return AnimationNone;
}

//____________________________________________________________
qreal ScrollBarEngine::opacity(const QObject *object, QStyle::SubControl control)
{
    if (isAnimated(object, AnimationHover, control))
        return static_cast<const ScrollBarData *>(data(object, AnimationHover).data())->opacity(control);
    else if (control == QStyle::SC_ScrollBarSlider)
        return WidgetStateEngine::buttonOpacity(object);
    return AnimationData::OpacityInvalid;
}
//____________________________________________________________
void ScrollBarEngine::transientUpdate(const QObject *object)
{
    if (!object) {
        return;
    }

    const auto dataMap = data(object, AnimationHover);
    if (dataMap) {
        static_cast<ScrollBarData *>(dataMap.data())->transientUpdate();
    }
}

//____________________________________________________________
qreal ScrollBarEngine::transientOpacity(const QObject *object)
{
    if (!object) {
        return AnimationData::OpacityInvalid;
    }

    const auto dataMap = data(object, AnimationHover);
    if (!dataMap) {
        return AnimationData::OpacityInvalid;
    }

    return static_cast<const ScrollBarData *>(dataMap.data())->transientOpacity();
}

void ScrollBarEngine::setNeedPreExpand(QWidget *widget, bool near)
{
    if (!widget) {
        return;
    }

    const auto dataMap = data(widget, AnimationHover);
    if (dataMap) {
        auto data = static_cast<ScrollBarData *>(dataMap.data());
        if (data->isNeedPreExpand() != near) {
            data->setNeedPreExpand(near);
            widget->updateGeometry();
        }
    }
}

bool ScrollBarEngine::isNeedPreExpand(const QObject *object)
{
    if (!object) {
        return false;
    }

    const auto dataMap = data(object, AnimationHover);
    if (!dataMap) {
        return false;
    }

    return static_cast<const ScrollBarData *>(dataMap.data())->isNeedPreExpand();
}

}
