qvariantanimation_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QVARIANTANIMATION_P_H
#define QVARIANTANIMATION_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include "qvariantanimation.h"
#include <QtCore/qeasingcurve.h>
#include <QtCore/qmetaobject.h>
 
#include "private/qabstractanimation_p.h"
#include "private/qproperty_p.h"
 
#include <type_traits>
 
QT_REQUIRE_CONFIG(animation);
 
QT_BEGIN_NAMESPACE
 
class QVariantAnimationPrivate : public QAbstractAnimationPrivate
{
    Q_DECLARE_PUBLIC(QVariantAnimation)
public:
 
    QVariantAnimationPrivate();
 
    static QVariantAnimationPrivate *get(QVariantAnimation *q)
    {
        return q->d_func();
    }
 
    void setDefaultStartEndValue(const QVariant &value);
 
 
    QVariant currentValue;
    QVariant defaultStartEndValue;
 
    //this is used to keep track of the KeyValue interval in which we currently are
    struct
    {
        QVariantAnimation::KeyValue start, end;
    } currentInterval;
 
    void setEasingCurve(const QEasingCurve &easing) { q_func()->setEasingCurve(easing); }
    Q_OBJECT_COMPAT_PROPERTY(QVariantAnimationPrivate, QEasingCurve, easing,
                             &QVariantAnimationPrivate::setEasingCurve)
 
    void setDuration(int msecs) { q_func()->setDuration(msecs); }
    Q_OBJECT_COMPAT_PROPERTY(QVariantAnimationPrivate, int, duration,
                             &QVariantAnimationPrivate::setDuration)
 
    QVariantAnimation::KeyValues keyValues;
    QVariantAnimation::Interpolator interpolator;
 
    void setCurrentValueForProgress(const qreal progress);
    void recalculateCurrentInterval(bool force=false);
    void setValueAt(qreal, const QVariant &);
    QVariant valueAt(qreal step) const;
    void convertValues(int t);
 
    void updateInterpolator();
 
    //XXX this is needed by dui
    static Q_CORE_EXPORT QVariantAnimation::Interpolator getInterpolator(int interpolationType);
};
 
//this should make the interpolation faster
template<typename T>
typename std::enable_if<std::is_unsigned<T>::value, T>::type
_q_interpolate(const T &f, const T &t, qreal progress)
{
    return T(f + t * progress - f * progress);
}
 
// the below will apply also to all non-arithmetic types
template<typename T>
typename std::enable_if<!std::is_unsigned<T>::value, T>::type
_q_interpolate(const T &f, const T &t, qreal progress)
{
    return T(f + (t - f) * progress);
}
 
template<typename T > inline QVariant _q_interpolateVariant(const T &from, const T &to, qreal progress)
{
    return _q_interpolate(from, to, progress);
}
 
 
QT_END_NAMESPACE
 
#endif //QVARIANTANIMATION_P_H