qsequentialanimationgroupjob_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 QSEQUENTIALANIMATIONGROUPJOB_P_H
#define QSEQUENTIALANIMATIONGROUPJOB_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 <private/qanimationgroupjob_p.h>
 
QT_REQUIRE_CONFIG(qml_animation);
 
QT_BEGIN_NAMESPACE
 
class QPauseAnimationJob;
class Q_QML_EXPORT QSequentialAnimationGroupJob : public QAnimationGroupJob
{
    Q_DISABLE_COPY(QSequentialAnimationGroupJob)
public:
    QSequentialAnimationGroupJob();
    ~QSequentialAnimationGroupJob();
 
    int duration() const override;
 
    QAbstractAnimationJob *currentAnimation() const { return m_currentAnimation; }
    void clear() override;
 
protected:
    void updateCurrentTime(int) override;
    void updateState(QAbstractAnimationJob::State newState, QAbstractAnimationJob::State oldState) override;
    void updateDirection(QAbstractAnimationJob::Direction direction) override;
    void uncontrolledAnimationFinished(QAbstractAnimationJob *animation) override;
    void debugAnimation(QDebug d) const override;
 
private:
    struct AnimationIndex
    {
        AnimationIndex() {}
        // AnimationIndex points to the animation at timeOffset, skipping 0 duration animations.
        // Note that the index semantic is slightly different depending on the direction.
        bool afterCurrent = false;  //whether animation is before or after m_currentAnimation   //TODO: make enum Before/After/Same
        int timeOffset = 0; // time offset when the animation at index starts.
        const QAbstractAnimationJob *animation = nullptr; //points to the animation at timeOffset
    };
 
    int animationActualTotalDuration(const QAbstractAnimationJob *anim) const;
    AnimationIndex indexForCurrentTime() const;
 
    void setCurrentAnimation(const QAbstractAnimationJob *anim, bool intermediate = false);
    void activateCurrentAnimation(bool intermediate = false);
 
    void animationInserted(QAbstractAnimationJob *anim) override;
    void animationRemoved(QAbstractAnimationJob *anim, QAbstractAnimationJob *, QAbstractAnimationJob *) override;
 
    bool atEnd() const;
 
    void restart();
 
    // handle time changes
    void rewindForwards(const AnimationIndex &newAnimationIndex);
    void advanceForwards(const AnimationIndex &newAnimationIndex);
 
    //state
    QAbstractAnimationJob *m_currentAnimation = nullptr;
    int m_previousLoop = 0;
};
 
QT_END_NAMESPACE
 
#endif //QSEQUENTIALANIMATIONGROUPJOB_P_H