/*
 * Copyright 2015 Canonical Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; version 3.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Loïc Molinari <loic.molinari@canonical.com>
 */

#include "ucproportionalshape_p.h"

UT_NAMESPACE_BEGIN

const qreal aspectRatio = 16.0 / 15.0;
const qreal invAspectRatio = 1.0 / aspectRatio;

/*! \qmltype ProportionalShape
    \inqmlmodule Ubuntu.Components
    \ingroup ubuntu
    \brief Extended UbuntuShape mostly used for icons and vignettes.

    The ProportionalShape is an extended \l UbuntuShape with a fixed aspect ratio (16:15), a
    relative radius and a PreserveAspectCrop source fill mode. Changing the width implies an update
    of height and radius, and changing the height implies an update of width and radius. The goal
    being to keep the same proportion between width, height and radius whatever the size.
*/
UCProportionalShape::UCProportionalShape(QQuickItem* parent)
    : UCUbuntuShape(parent)
{
    setRelativeRadius(0.67);
    setSourceFillMode(UCUbuntuShape::PreserveAspectCrop);
    connect(this, SIGNAL(widthChanged()), this, SLOT(_q_updateHeight()));
    connect(this, SIGNAL(heightChanged()), this, SLOT(_q_updateWidth()));
}

void UCProportionalShape::_q_updateWidth()
{
    const qreal newWidth = height() * aspectRatio;
    if (qAbs(newWidth - width()) > 0.5) {
        setWidth(newWidth);
    }
}

void UCProportionalShape::_q_updateHeight()
{
    const qreal newHeight = width() * invAspectRatio;
    if (qAbs(newHeight - height()) > 0.5) {
        setHeight(newHeight);
    }
}

void UCProportionalShape::componentComplete()
{
    QQuickItem::componentComplete();
    _q_updateHeight();
}

UT_NAMESPACE_END
