src_corelib_animation_qvariantanimation.cpp

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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
    QVariant myColorInterpolator(const QColor &start, const QColor &end, qreal progress)
    {
        ...
        return QColor(...);
    }
    ...
    qRegisterAnimationInterpolator<QColor>(myColorInterpolator);
 
    QVariant myInterpolator(const QVariant &from, const QVariant &to, qreal progress);