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;
}
static PyObject *meth_QScroller_setSnapPositionsY(PyObject *sipSelf, PyObject *sipArgs)
{
PyObject *sipParseErr = NULL;
{
const QList<qreal>* a0;
int a0State = 0;
QScroller *sipCpp;
if (sipParseArgs(&sipParseErr, sipArgs, "BJ1", &sipSelf, sipType_QScroller, &sipCpp, sipType_QList_2400,&a0, &a0State))
{
sipCpp->setSnapPositionsY(*a0);
sipReleaseType(const_cast<QList<qreal> *>(a0),sipType_QList_2400,a0State);
Py_INCREF(Py_None);
return Py_None;
}
}
{
qreal a0;
qreal a1;
QScroller *sipCpp;
if (sipParseArgs(&sipParseErr, sipArgs, "Bdd", &sipSelf, sipType_QScroller, &sipCpp, &a0, &a1))
{
sipCpp->setSnapPositionsY(a0,a1);
Py_INCREF(Py_None);
return Py_None;
}
}
/* Raise an exception if the arguments couldn't be parsed. */
sipNoMethod(sipParseErr, sipName_QScroller, sipName_setSnapPositionsY, doc_QScroller_setSnapPositionsY);
return NULL;
}
