86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
/*
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SPDX-FileCopyrightText: 2011 Marco Martin <mart@kde.org>
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SPDX-FileCopyrightText: 2011 Nokia Corporation and /or its subsidiary(-ies) <qt-info@nokia.com>
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This file is part of the Qt Components project on Qt Labs.
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SPDX-License-Identifier: LGPL-2.1-only
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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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{
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return inverted ? posatmax : posatmin;
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}
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inline qreal effectivePosAtMax() const
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{
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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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{
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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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}
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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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{
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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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}
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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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