void WaveformWidgetFactory::swap() {
    ScopedTimer t(QString("WaveformWidgetFactory::swap() %1waveforms")
            .arg(m_waveformWidgetHolders.size()));

    // Do this in an extra slot to be sure to hit the desired interval
    if (!m_skipRender) {
        if (m_type) {   // no regular updates for an empty waveform
            // Show rendered buffer from last render() run
            //qDebug() << "swap() start" << m_vsyncThread->elapsed();
            for (int i = 0; i < m_waveformWidgetHolders.size(); i++) {
                WaveformWidgetAbstract* pWaveformWidget = m_waveformWidgetHolders[i].m_waveformWidget;
                if (pWaveformWidget->getWidth() > 0) {
                    QGLWidget* glw = dynamic_cast<QGLWidget*>(pWaveformWidget->getWidget());
                    if (glw) {
                        m_vsyncThread->swapGl(glw, i);
                    }
                }

                //qDebug() << "swap x" << m_vsyncThread->elapsed();
            }
        }
    }
    //qDebug() << "swap end" << m_vsyncThread->elapsed();
    m_vsyncThread->vsyncSlotFinished();
}

void WaveformWidgetFactory::swap() {
    ScopedTimer t("WaveformWidgetFactory::swap() %1waveforms", m_waveformWidgetHolders.size());

    // Do this in an extra slot to be sure to hit the desired interval
    if (!m_skipRender) {
        if (m_type) {   // no regular updates for an empty waveform
            // Show rendered buffer from last render() run
            //qDebug() << "swap() start" << m_vsyncThread->elapsed();
            for (int i = 0; i < m_waveformWidgetHolders.size(); i++) {
                WaveformWidgetAbstract* pWaveformWidget = m_waveformWidgetHolders[i].m_waveformWidget;
                if (pWaveformWidget->getWidth() > 0) {
                    QGLWidget* glw = dynamic_cast<QGLWidget*>(pWaveformWidget->getWidget());
                    // Don't swap invalid or invisible widgets. Prevents
                    // continuous log spew of "QOpenGLContext::swapBuffers()
                    // called with non-exposed window, behavior is undefined" on
                    // Qt5.
                    if (glw && glw->isValid() && glw->isVisible()) {
                        VSyncThread::swapGl(glw, i);
                    }
                }

                //qDebug() << "swap x" << m_vsyncThread->elapsed();
            }
        }
    }
    //qDebug() << "swap end" << m_vsyncThread->elapsed();
    m_vsyncThread->vsyncSlotFinished();
}

WaveformWidgetAbstract* WaveformWidgetFactory::createWaveformWidget(
        WaveformWidgetType::Type type, WWaveformViewer* viewer) {
    WaveformWidgetAbstract* widget = NULL;
    if (viewer) {
        if (CmdlineArgs::Instance().getSafeMode()) {
            type = WaveformWidgetType::EmptyWaveform;
        }

        switch(type) {
        case WaveformWidgetType::SoftwareWaveform:
            widget = new SoftwareWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::HSVWaveform:
            widget = new HSVWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::RGBWaveform:
            widget = new RGBWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::QtSimpleWaveform:
            widget = new QtSimpleWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::QtWaveform:
            widget = new QtWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::GLSimpleWaveform:
            widget = new GLSimpleWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::GLWaveform:
            widget = new GLWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::GLRGBWaveform:
            widget = new GLRGBWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::GLSLWaveform:
            widget = new GLSLWaveformWidget(viewer->getGroup(), viewer);
            break;
        case WaveformWidgetType::GLVSyncTest:
            widget = new GLVSyncTestWidget(viewer->getGroup(), viewer);
            break;
        default:
        //case WaveformWidgetType::SoftwareSimpleWaveform: TODO: (vrince)
        //case WaveformWidgetType::EmptyWaveform:
            widget = new EmptyWaveformWidget(viewer->getGroup(), viewer);
            break;
        }
        widget->castToQWidget();
        if (!widget->isValid()) {
            qWarning() << "failed to init WafeformWidget" << type << "fall back to \"Empty\"";
            delete widget;
            widget = new EmptyWaveformWidget(viewer->getGroup(), viewer);
            widget->castToQWidget();
            if (!widget->isValid()) {
                qWarning() << "failed to init EmptyWaveformWidget";
                delete widget;
                widget = NULL;
            }
        }
    }
    return widget;
}

void WaveformWidgetFactory::notifyZoomChange(WWaveformViewer* viewer) {
    WaveformWidgetAbstract* pWaveformWidget = viewer->getWaveformWidget();
    if (pWaveformWidget != NULL && isZoomSync()) {
        //qDebug() << "WaveformWidgetFactory::notifyZoomChange";
        int refZoom = pWaveformWidget->getZoomFactor();

        for (int i = 0; i < m_waveformWidgetHolders.size(); ++i) {
            WaveformWidgetHolder& holder = m_waveformWidgetHolders[i];
            if (holder.m_waveformViewer != viewer) {
                holder.m_waveformViewer->setZoom(refZoom);
            }
        }
    }
}

bool WaveformWidgetFactory::setWidgetTypeFromHandle(int handleIndex) {
    if (handleIndex < 0 && handleIndex > (int)m_waveformWidgetHandles.size()) {
        qDebug() << "WaveformWidgetFactory::setWidgetType - invalid handle --> use of 'EmptyWaveform'";
        // fallback empty type
        setWidgetType(WaveformWidgetType::EmptyWaveform);
        return false;
    }

    WaveformWidgetAbstractHandle& handle = m_waveformWidgetHandles[handleIndex];
    if (handle.m_type == m_type) {
        qDebug() << "WaveformWidgetFactory::setWidgetType - type already in use";
        return true;
    }

    // change the type
    setWidgetType(handle.m_type);

    m_skipRender = true;
    //qDebug() << "recreate start";

    //re-create/setup all waveform widgets
    for (int i = 0; i < m_waveformWidgetHolders.size(); i++) {
        WaveformWidgetHolder& holder = m_waveformWidgetHolders[i];
        WaveformWidgetAbstract* previousWidget = holder.m_waveformWidget;
        TrackPointer pTrack = previousWidget->getTrackInfo();
        //previousWidget->hold();
        int previousZoom = previousWidget->getZoomFactor();
        delete previousWidget;
        WWaveformViewer* viewer = holder.m_waveformViewer;
        WaveformWidgetAbstract* widget = createWaveformWidget(m_type, holder.m_waveformViewer);
        holder.m_waveformWidget = widget;
        viewer->setWaveformWidget(widget);
        viewer->setup(holder.m_skinNodeCache, holder.m_skinContextCache);
        viewer->setZoom(previousZoom);
        // resize() doesn't seem to get called on the widget. I think Qt skips
        // it since the size didn't change.
        //viewer->resize(viewer->size());
        widget->resize(viewer->width(), viewer->height());
        widget->setTrack(pTrack);
        widget->getWidget()->show();
        viewer->update();
    }

    m_skipRender = false;
    //qDebug() << "recreate done";
    return true;
}