KisTouchHoldEventsPostponer.h

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/*
 *  SPDX-FileCopyrightText: 2026 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#ifndef KISTOUCHHOLDEVENTSPOSTPONER_H
#define KISTOUCHHOLDEVENTSPOSTPONER_H
 
#include <QTimer>
#include <kritaui_export.h>
 
class QTouchEvent;
 
class KRITAUI_EXPORT KisTouchHoldEventsPostponer : public QObject
{
    Q_OBJECT
public:
    enum State {
        WaitingForHold, 
        HoldCompleted, 
        HoldCancelled 
    };
public:
    KisTouchHoldEventsPostponer(qreal maxHoldDistance, int holdTimeout);
    KisTouchHoldEventsPostponer(const KisTouchHoldEventsPostponer &rhs) = delete;
    ~KisTouchHoldEventsPostponer();
 
    State state() const;
 
    void pushThrough(QTouchEvent *event);
 
    void cancelHoldWait();
 
    QVector<QTouchEvent*> postponedEvents();
 
Q_SIGNALS:
    void sigHoldCompleted();
 
private Q_SLOTS:
    void slotHoldCompletionTimeout();
 
private:
    bool qualifyForPostponing(QTouchEvent *event);
 
    void enqueueEvent(QTouchEvent *event);
 
private:
    QTimer m_timer;
    State m_state { WaitingForHold };
    QVector<QTouchEvent*> m_postponedEvents;
    qreal m_maxHoldDistance {20.0} ;
};
 
#endif // KISTOUCHHOLDEVENTSPOSTPONER_H