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 AbstractWheelWidget::event(QEvent *e)
{
switch (e->type()) {
// ![1]
case QEvent::ScrollPrepare:
{
// We set the snap positions as late as possible so that we are sure
// we get the correct itemHeight
QScroller *scroller = QScroller::scroller(this);
scroller->setSnapPositionsY( WHEEL_SCROLL_OFFSET, itemHeight() );
QScrollPrepareEvent *se = static_cast<QScrollPrepareEvent *>(e);
se->setViewportSize(QSizeF(size()));
// we claim a huge scrolling area and a huge content position and
// hope that the user doesn't notice that the scroll area is restricted
se->setContentPosRange(QRectF(0.0, 0.0, 0.0, WHEEL_SCROLL_OFFSET * 2));
se->setContentPos(QPointF(0.0, WHEEL_SCROLL_OFFSET + m_currentItem * itemHeight() + m_itemOffset));
se->accept();
return true;
}
// ![1]
// ![2]
case QEvent::Scroll:
{
QScrollEvent *se = static_cast<QScrollEvent *>(e);
qreal y = se->contentPos().y();
int iy = y - WHEEL_SCROLL_OFFSET;
int ih = itemHeight();
// ![2]
// ![3]
// -- calculate the current item position and offset and redraw the widget
int ic = itemCount();
if (ic>0) {
m_currentItem = iy / ih % ic;
m_itemOffset = iy % ih;
// take care when scrolling backwards. Modulo returns negative numbers
if (m_itemOffset < 0) {
m_itemOffset += ih;
m_currentItem--;
}
if (m_currentItem < 0)
m_currentItem += ic;
}
// -- repaint
update();
se->accept();
return true;
// ![3]
}
default:
return QWidget::event(e);
}
return true;
}
bool SwipeCover::event(QEvent *e)
{
switch (e->type()) {
case QEvent::ScrollPrepare:
{
for(int i=0; i<delta; i++)
posLst.append(curPos);
QScrollPrepareEvent *se = static_cast<QScrollPrepareEvent *>(e);
se->setViewportSize(QSizeF(parentSize));
se->setContentPosRange(QRectF(0.0, 0.0, 0.0,range));
se->setContentPos(QPointF(0.0, curPos));
se->accept();
isScrolled=false;
qDebug()<<"ScrollPrepare";
return true;
}
case QEvent::Scroll:
{
QScrollEvent *se = static_cast<QScrollEvent *>(e);
isScrolled = true;
curPos = se->contentPos().y();
scrollBar->setValue((int)(curPos/k));
qDebug() <<"Scroll: " << curPos;
int ic = 20;
if (ic>0) {
}
se->accept();
return true;
}
case QEvent::MouseButtonPress:
isScrolled = false;
return true;
case QEvent::MouseButtonRelease:
if(!isScrolled)
{
qDebug()<<"MouseButtonClick!!! "<<((QMouseEvent*)e)->pos();
emit onClick(((QMouseEvent*)e)->pos()+QPoint(0,scrollBar->value()));
}
isScrolled = false;
return true;
default:
return QWidget::event(e);
}
return true;
}
