qvariantanimation.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_H
#define QVARIANTANIMATION_H
 
#include <QtCore/qabstractanimation.h>
#include <QtCore/qeasingcurve.h>
#include <QtCore/qlist.h>
#include <QtCore/qpair.h>
#include <QtCore/qvariant.h>
 
QT_REQUIRE_CONFIG(animation);
 
QT_BEGIN_NAMESPACE
 
class QVariantAnimationPrivate;
class Q_CORE_EXPORT QVariantAnimation : public QAbstractAnimation
{
    Q_OBJECT
    Q_PROPERTY(QVariant startValue READ startValue WRITE setStartValue)
    Q_PROPERTY(QVariant endValue READ endValue WRITE setEndValue)
    Q_PROPERTY(QVariant currentValue READ currentValue NOTIFY valueChanged)
    Q_PROPERTY(int duration READ duration WRITE setDuration BINDABLE bindableDuration)
    Q_PROPERTY(QEasingCurve easingCurve READ easingCurve WRITE setEasingCurve
               BINDABLE bindableEasingCurve)
 
public:
    using KeyValue = std::pair<qreal, QVariant>;
    typedef QList<KeyValue> KeyValues;
 
    QVariantAnimation(QObject *parent = nullptr);
    ~QVariantAnimation();
 
    QVariant startValue() const;
    void setStartValue(const QVariant &value);
 
    QVariant endValue() const;
    void setEndValue(const QVariant &value);
 
    QVariant keyValueAt(qreal step) const;
    void setKeyValueAt(qreal step, const QVariant &value);
 
    KeyValues keyValues() const;
    void setKeyValues(const KeyValues &values);
 
    QVariant currentValue() const;
 
    int duration() const override;
    void setDuration(int msecs);
    QBindable<int> bindableDuration();
 
    QEasingCurve easingCurve() const;
    void setEasingCurve(const QEasingCurve &easing);
    QBindable<QEasingCurve> bindableEasingCurve();
 
    typedef QVariant (*Interpolator)(const void *from, const void *to, qreal progress);
 
Q_SIGNALS:
    void valueChanged(const QVariant &value);
 
protected:
    QVariantAnimation(QVariantAnimationPrivate &dd, QObject *parent = nullptr);
    bool event(QEvent *event) override;
 
    void updateCurrentTime(int) override;
    void updateState(QAbstractAnimation::State newState, QAbstractAnimation::State oldState) override;
 
    virtual void updateCurrentValue(const QVariant &value);
    virtual QVariant interpolated(const QVariant &from, const QVariant &to, qreal progress) const;
 
private:
    template <typename T> friend void qRegisterAnimationInterpolator(QVariant (*func)(const T &, const T &, qreal));
    static void registerInterpolator(Interpolator func, int interpolationType);
 
    Q_DISABLE_COPY(QVariantAnimation)
    Q_DECLARE_PRIVATE(QVariantAnimation)
};
 
template <typename T>
void qRegisterAnimationInterpolator(QVariant (*func)(const T &from, const T &to, qreal progress)) {
    QVariantAnimation::registerInterpolator(reinterpret_cast<QVariantAnimation::Interpolator>(reinterpret_cast<void(*)()>(func)), qMetaTypeId<T>());
}
 
QT_END_NAMESPACE
 
#endif //QVARIANTANIMATION_H