/*
 *   Copyright 2013 Marco Martin <mart@kde.org>
 *
 *   This program 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, 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 Library 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.
 */

#ifndef UNITS_H
#define UNITS_H

#include <QObject>



class Units : public QObject
{
    Q_OBJECT

    /**
     * The fundamental unit of space that should be used for sizes, expressed in pixels.
     * Given the screen has an accurate DPI settings, it corresponds to a millimeter
     */
    Q_PROPERTY(qreal gridUnit READ gridUnit NOTIFY gridUnitChanged())

public:
    Units(QObject *parent = 0);
    ~Units();

    qreal gridUnit() const;

    /**
     * @returns the number of pixels value density independent pixels correspond to.
     */
    Q_INVOKABLE qreal dp(qreal value) const;

    /**
     * @returns the number of pixels value grid units correspond to.
     */
    Q_INVOKABLE qreal gu(qreal value) const;


Q_SIGNALS:
    void gridUnitChanged();

private Q_SLOTS:
    void themeChanged();

private:
    int m_gridUnit;
};

#endif //UNITS_H