bool scroll_widget::event(QEvent *a_event_ptr) {
if (!o_scroll_widget->m_viewport) {
return QGraphicsObject::event(a_event_ptr);
}
switch (a_event_ptr->type()) {
case QScrollPrepareEvent::ScrollPrepare: {
qDebug() << Q_FUNC_INFO << "Prepare :";
QScrollPrepareEvent *se = static_cast<QScrollPrepareEvent *>(a_event_ptr);
se->setViewportSize(o_scroll_widget->m_size);
QRectF br = o_scroll_widget->m_viewport->boundingRect();
se->setContentPosRange(QRectF(
0, 0, qMax(qreal(0), br.width() - o_scroll_widget->m_size.width()),
qMax(qreal(0), br.height() - o_scroll_widget->m_size.height())));
se->setContentPos(-o_scroll_widget->m_viewport->pos());
se->accept();
return QGraphicsObject::event(a_event_ptr);
}
case QScrollEvent::Scroll: {
qDebug() << Q_FUNC_INFO << "Scroll";
QScrollEvent *se = static_cast<QScrollEvent *>(a_event_ptr);
o_scroll_widget->m_viewport->setPos(-se->contentPos() -
se->overshootDistance());
return true;
}
default:
break;
}
return QGraphicsObject::event(a_event_ptr);
}
bool QtViewportInteractionEngine::event(QEvent* event)
{
switch (event->type()) {
case QEvent::ScrollPrepare: {
QScrollPrepareEvent* prepareEvent = static_cast<QScrollPrepareEvent*>(event);
const QRectF viewportRect = m_viewport->boundingRect();
const QRectF contentRect = m_viewport->mapRectFromItem(m_content, m_content->boundingRect());
const QRectF posRange = computePosRangeForItemAtScale(m_content->contentsScale());
prepareEvent->setContentPosRange(posRange);
prepareEvent->setViewportSize(viewportRect.size());
// As we want to push the contents and not actually scroll it, we need to invert the positions here.
prepareEvent->setContentPos(-contentRect.topLeft());
prepareEvent->accept();
return true;
}
case QEvent::Scroll: {
QScrollEvent* scrollEvent = static_cast<QScrollEvent*>(event);
QPointF newPos = -scrollEvent->contentPos() - scrollEvent->overshootDistance();
if (m_content->pos() != newPos) {
QPointF currentPosInCSSCoordinates = m_viewport->mapToWebContent(m_content->pos());
QPointF newPosInCSSCoordinates = m_viewport->mapToWebContent(newPos);
// This must be emitted before viewportUpdateRequested so that the web process knows where to look for tiles.
emit viewportTrajectoryVectorChanged(currentPosInCSSCoordinates - newPosInCSSCoordinates);
m_content->setPos(newPos);
}
return true;
}
default:
break;
}
return QObject::event(event);
}
bool PlotWidget::eventFilter(QObject *obj, QEvent *ev)
{
if (ev->type() == QEvent::Scroll) {
QScrollEvent *se = static_cast<QScrollEvent *>(ev);
QScroller *scroller = QScroller::scroller(m_widget);
QPointF v = scroller->velocity();
//v.rx() *= scroller->pixelPerMeter().x();
//v.ry() *= scroller->pixelPerMeter().y();
PlotItem pi = { v, se->contentPos(), se->overshootDistance() };
addPlotItem(pi);
}
return QWidget::eventFilter(obj, ev);
}