98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
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/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Components project on Qt Labs.
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**
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions contained
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** in the Technology Preview License Agreement accompanying this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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****************************************************************************/
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#ifndef QRANGEMODEL_P_H
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#define QRANGEMODEL_P_H
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt Components API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include "qrangemodel.h"
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namespace Plasma
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{
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class QRangeModelPrivate
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{
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Q_DECLARE_PUBLIC(QRangeModel)
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public:
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QRangeModelPrivate(QRangeModel *qq);
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virtual ~QRangeModelPrivate();
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void init();
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qreal posatmin, posatmax;
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qreal minimum, maximum, stepSize, pos, value;
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uint inverted : 1;
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QRangeModel *q_ptr;
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inline qreal effectivePosAtMin() const {
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return inverted ? posatmax : posatmin;
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}
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inline qreal effectivePosAtMax() const {
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return inverted ? posatmin : posatmax;
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}
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inline qreal equivalentPosition(qreal value) const {
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// Return absolute position from absolute value
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const qreal valueRange = maximum - minimum;
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if (valueRange == 0)
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return effectivePosAtMin();
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const qreal scale = (effectivePosAtMax() - effectivePosAtMin()) / valueRange;
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return (value - minimum) * scale + effectivePosAtMin();
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}
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inline qreal equivalentValue(qreal pos) const {
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// Return absolute value from absolute position
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const qreal posRange = effectivePosAtMax() - effectivePosAtMin();
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if (posRange == 0)
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return minimum;
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const qreal scale = (maximum - minimum) / posRange;
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return (pos - effectivePosAtMin()) * scale + minimum;
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}
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qreal publicPosition(qreal position) const;
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qreal publicValue(qreal value) const;
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void emitValueAndPositionIfChanged(const qreal oldValue, const qreal oldPosition);
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};
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} // Plasma namespace
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#endif // QRANGEMODEL_P_H
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