kis_busy_progress_indicator.cpp

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/*
 *  SPDX-FileCopyrightText: 2015 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "kis_busy_progress_indicator.h"
 
#include <QTimer>
#include <QAtomicInt>
 
#include "KoProgressProxy.h"
 
 
struct KisBusyProgressIndicator::Private
{
    Private(KisBusyProgressIndicator *_q)
        : timer(new QTimer(_q))
        {}
 
    QTimer *timer {nullptr}; // owned by QObject hierarchy
    int numEmptyTicks {0};
    QAtomicInt numUpdates;
    QAtomicInt timerStarted;
    KoProgressProxy *progressProxy {nullptr};
 
    bool isStarted {false};
 
    void startProgressReport()
    {
        if (!progressProxy) {
            return;
        }
        isStarted = true;
        progressProxy->setRange(0, 0);
    }
 
    void stopProgressReport()
    {
        if (!isStarted || !progressProxy) {
            return;
        }
        progressProxy->setRange(0, 100);
        progressProxy->setValue(100);
        isStarted = false;
    }
};
 
 
KisBusyProgressIndicator::KisBusyProgressIndicator(KoProgressProxy *progressProxy)
    : m_d(new Private(this))
{
    connect(m_d->timer, SIGNAL(timeout()), SLOT(timerFinished()));
    connect(this, SIGNAL(sigStartTimer()), SLOT(slotStartTimer()));
    m_d->timer->setInterval(200);
    m_d->progressProxy = progressProxy;
}
 
KisBusyProgressIndicator::~KisBusyProgressIndicator()
{
    m_d->stopProgressReport();
}
 
void KisBusyProgressIndicator::prepareDestroying()
{
    m_d->progressProxy = 0;
}
 
void KisBusyProgressIndicator::timerFinished()
{
    int value = m_d->numUpdates.fetchAndStoreOrdered(0);
 
    if (!value) {
        m_d->numEmptyTicks++;
 
        if (m_d->numEmptyTicks > 2) {
            m_d->timerStarted = 0;
            m_d->timer->stop();
            m_d->stopProgressReport();
        }
    } else {
        m_d->numEmptyTicks = 0;
    }
}
 
void KisBusyProgressIndicator::update()
{
    m_d->numUpdates.ref();
 
    if (!m_d->timerStarted) {
        Q_EMIT sigStartTimer();
    }
}
 
void KisBusyProgressIndicator::slotStartTimer()
{
    m_d->timerStarted.ref();
    m_d->timer->start();
    m_d->startProgressReport();
}