AbstractScrollArea::AbstractScrollArea(QGraphicsWidget *parent)
: GvbWidget(parent)
, m_viewport(0)
, m_horizontalScrollBar(0)
, m_verticalScrollBar(0)
, m_prevHorizontalValue(0.0)
, m_prevVerticalValue(0.0)
{
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
setContentsMargins(0, 0, 0, 0);
m_horizontalScrollBar = new ScrollBar(Qt::Horizontal, this);
m_horizontalScrollBar->hide();
m_horizontalScrollBar->setContentsMargins(0, 0, 0, 0);
m_horizontalScrollBarPolicy = Qt::ScrollBarAsNeeded;
m_horizontalScrollBar->setZValue(zValue()+1); // Raise scroll bar to top
m_horizontalScrollBar->setVisible(false);
connect(m_horizontalScrollBar, SIGNAL(sliderPositionChange(qreal)),
this, SLOT(horizontalScroll(qreal)));
connect(m_horizontalScrollBar, SIGNAL(sliderPressed()),
this, SLOT(horizontalScrollStart()));
m_verticalScrollBar = new ScrollBar(Qt::Vertical, this);
m_verticalScrollBar->hide();
m_verticalScrollBar->setContentsMargins(0, 0, 0, 0);
m_verticalScrollBarPolicy = Qt::ScrollBarAsNeeded;
m_verticalScrollBar->setZValue(zValue()+1); // Raise scroll bar to top
m_verticalScrollBar->setVisible(false);
connect(m_verticalScrollBar, SIGNAL(sliderPositionChange(qreal)),
this, SLOT(verticalScroll(qreal)));
connect(m_verticalScrollBar, SIGNAL(sliderPressed()),
this, SLOT(verticalScrollStart()));
QGraphicsWidget *viewport = new QGraphicsWidget;
setViewport(viewport);
}
//---------------------------------------------------------
// wheelEvent
//---------------------------------------------------------
void WaveView::wheelEvent(QWheelEvent* ev)
{
int keyState = ev->modifiers();
bool shift = keyState & Qt::ShiftModifier;
bool ctrl = keyState & Qt::ControlModifier;
if (shift) { // scroll vertically
int delta = -ev->delta() / WHEEL_DELTA;
int xpixelscale = 5*MusECore::fast_log10(rmapxDev(1));
if (xpixelscale <= 0)
xpixelscale = 1;
int scrollstep = WHEEL_STEPSIZE * (delta);
///if (ev->state() == Qt::ShiftModifier)
// if (((QInputEvent*)ev)->modifiers() == Qt::ShiftModifier)
scrollstep = scrollstep / 10;
int newXpos = xpos + xpixelscale * scrollstep;
if (newXpos < 0)
newXpos = 0;
//setYPos(newYpos);
emit horizontalScroll((unsigned)newXpos);
} else if (ctrl) { // zoom horizontally
if (ev->delta()>0)
emit horizontalZoomIn();
else
emit horizontalZoomOut();
} else { // scroll horizontally
emit mouseWheelMoved(ev->delta() / 10);
}
}
