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76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
/*
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* Copyright 2013 Marco Martin <mart@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "units.h"
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#include <QApplication>
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#include <QDebug>
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#include <QDesktopWidget>
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#include <QtGlobal>
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#include <cmath>
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#include <Plasma/Theme>
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Units::Units (QObject *parent)
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: QObject(parent),
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m_gridUnit(-1)
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{
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themeChanged();
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connect(Plasma::Theme::defaultTheme(), SIGNAL(themeChanged()),
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this, SLOT(themeChanged()));
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}
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Units::~Units()
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{
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}
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qreal Units::gridUnit() const
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{
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return m_gridUnit;
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}
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qreal Units::dp(qreal value) const
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{
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//Usual "default" is 96 dpi
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//that magic ratio follows the definition of "device independent pixel" by Microsoft
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const qreal ratio = (qreal)QApplication::desktop()->physicalDpiX() / (qreal)96;
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if (value <= 2.0) {
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return qRound(value * floor(ratio));
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} else {
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return qRound(value * ratio);
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}
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}
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qreal Units::gu(qreal value) const
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{
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return qRound(m_gridUnit * value);
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}
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void Units::themeChanged()
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{
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const int gridUnit = QFontMetrics(Plasma::Theme::defaultTheme()->font(Plasma::Theme::DefaultFont)).boundingRect("M").width();
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if (gridUnit != m_gridUnit) {
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m_gridUnit = gridUnit;
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emit gridUnitChanged();
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}
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}
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#include "moc_units.cpp"
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