void QwtPicker::drawTracker(QPainter *painter) const
{
const QRect textRect = trackerRect(painter->font());
if ( !textRect.isEmpty() )
{
QwtText label = trackerText(d_data->trackerPosition);
if ( !label.isEmpty() )
{
painter->save();
#if defined(Q_WS_MAC)
// Antialiased fonts are broken on the Mac.
#if QT_VERSION >= 0x040000
painter->setRenderHint(QPainter::TextAntialiasing, false);
#else
QFont fnt = label.usedFont(painter->font());
fnt.setStyleStrategy(QFont::NoAntialias);
label.setFont(fnt);
#endif
#endif
label.draw(painter, textRect);
painter->restore();
}
}
}
void QwtPicker::drawTracker(QPainter *painter) const
{
const QRect textRect = trackerRect(painter);
if ( !textRect.isEmpty() )
{
QwtText label = trackerText(d_data->labelPosition);
if ( !label.isEmpty() )
label.draw(painter, textRect);
}
}
//! Update the state of rubber band and tracker label
void QwtPicker::updateDisplay()
{
QWidget *w = parentWidget();
bool showRubberband = false;
bool showTracker = false;
if ( w && w->isVisible() && d_data->enabled )
{
if ( rubberBand() != NoRubberBand && isActive() &&
rubberBandPen().style() != Qt::NoPen )
{
showRubberband = true;
}
if ( trackerMode() == AlwaysOn ||
( trackerMode() == ActiveOnly && isActive() ) )
{
if ( trackerPen() != Qt::NoPen
&& !trackerRect( QFont() ).isEmpty() )
{
showTracker = true;
}
}
}
QPointer< QwtPickerRubberband > &rw = d_data->rubberBandOverlay;
if ( showRubberband )
{
if ( rw.isNull() )
{
rw = new QwtPickerRubberband( this, NULL ); // NULL -> no extra event filter
rw->setObjectName( "PickerRubberBand" );
rw->setParent( w );
rw->resize( w->size() );
}
if ( d_data->rubberBand <= RectRubberBand )
rw->setMaskMode( QwtWidgetOverlay::MaskHint );
else
rw->setMaskMode( QwtWidgetOverlay::AlphaMask );
rw->updateOverlay();
}
else
{
if ( d_data->openGL )
{
// Qt 4.8 crashes for a delete
if ( !rw.isNull() )
{
rw->hide();
rw->deleteLater();
rw = NULL;
}
}
else
{
delete rw;
}
}
QPointer< QwtPickerTracker > &tw = d_data->trackerOverlay;
if ( showTracker )
{
if ( tw.isNull() )
{
tw = new QwtPickerTracker( this, NULL ); // NULL -> no extra event filter
tw->setObjectName( "PickerTracker" );
tw->setParent( w );
tw->resize( w->size() );
}
tw->setFont( d_data->trackerFont );
tw->updateOverlay();
}
else
{
if ( d_data->openGL )
{
// Qt 4.8 crashes for a delete
if ( !tw.isNull() )
{
tw->hide();
tw->deleteLater();
tw = NULL;
}
}
else
{
delete tw;
}
}
}
