//! Update the widget that represents the curve on the legend
// this was adapted from QwtPlotCurve::updateLegend()
void HistogramItem::updateLegend( QwtLegend *legend ) const
{
if ( !legend )
return;
QwtPlotItem::updateLegend( legend );
QWidget *widget = legend->find( this );
if ( !widget || !widget->inherits( "QwtLegendItem" ) )
return;
QwtLegendItem *legendItem = ( QwtLegendItem * )widget;
#if QT_VERSION < 0x040000
const bool doUpdate = legendItem->isUpdatesEnabled();
#else
const bool doUpdate = legendItem->updatesEnabled();
#endif
legendItem->setUpdatesEnabled( false );
const int policy = legend->displayPolicy();
if ( policy == QwtLegend::FixedIdentifier )
{
int mode = legend->identifierMode();
legendItem->setCurvePen( QPen( color() ) );
if ( mode & QwtLegendItem::ShowText )
legendItem->setText( title() );
else
legendItem->setText( QwtText() );
legendItem->setIdentifierMode( mode );
}
else if ( policy == QwtLegend::AutoIdentifier )
{
int mode = 0;
legendItem->setCurvePen( QPen( color() ) );
mode |= QwtLegendItem::ShowLine;
if ( !title().isEmpty() )
{
legendItem->setText( title() );
mode |= QwtLegendItem::ShowText;
}
else
{
legendItem->setText( QwtText() );
}
legendItem->setIdentifierMode( mode );
}
legendItem->setUpdatesEnabled( doUpdate );
legendItem->update();
}
/*!
\brief Update the widget that represents the item on the legend
updateLegend() is called from itemChanged() to adopt the widget
representing the item on the legend to its new configuration.
The default implementation is made for QwtPolarCurve and updates a
QwtLegendItem(), but an item could be represented by any type of widget,
by overloading legendItem() and updateLegend().
\sa legendItem(), itemChanged(), QwtLegend()
*/
void QwtPolarItem::updateLegend( QwtLegend *legend ) const
{
if ( legend == NULL )
return;
QWidget *lgdItem = legend->find( this );
if ( testItemAttribute( QwtPolarItem::Legend ) )
{
if ( lgdItem == NULL )
{
lgdItem = legendItem();
if ( lgdItem )
legend->insert( this, lgdItem );
}
QwtLegendItem* label = qobject_cast<QwtLegendItem *>( lgdItem );
if ( label )
{
// paint the identifier
const QSize sz = label->identifierSize();
QPixmap identifier( sz.width(), sz.height() );
identifier.fill( Qt::transparent );
QPainter painter( &identifier );
painter.setRenderHint( QPainter::Antialiasing,
testRenderHint( QwtPolarItem::RenderAntialiased ) );
drawLegendIdentifier( &painter,
QRect( 0, 0, sz.width(), sz.height() ) );
painter.end();
const bool doUpdate = label->updatesEnabled();
if ( doUpdate )
label->setUpdatesEnabled( false );
label->setText( title() );
label->setIdentifier( identifier );
label->setItemMode( legend->itemMode() );
if ( doUpdate )
label->setUpdatesEnabled( true );
label->update();
}
}
else
{
if ( lgdItem )
{
lgdItem->hide();
lgdItem->deleteLater();
}
}
}
//! Update the widget that represents the curve on the legend
void QwtPolarCurve::updateLegend( QwtLegend *legend ) const
{
if ( !legend )
return;
QwtPolarItem::updateLegend( legend );
QWidget *widget = legend->find( this );
if ( !widget || !widget->inherits( "QwtLegendItem" ) )
return;
QwtLegendItem *legendItem = ( QwtLegendItem * )widget;
#if QT_VERSION < 0x040000
const bool doUpdate = legendItem->isUpdatesEnabled();
#else
const bool doUpdate = legendItem->updatesEnabled();
#endif
legendItem->setUpdatesEnabled( false );
const int policy = legend->displayPolicy();
if ( policy == QwtLegend::FixedIdentifier )
{
int mode = legend->identifierMode();
if ( mode & QwtLegendItem::ShowLine )
legendItem->setCurvePen( pen() );
if ( mode & QwtLegendItem::ShowSymbol )
legendItem->setSymbol( symbol() );
if ( mode & QwtLegendItem::ShowText )
legendItem->setText( title() );
else
legendItem->setText( QwtText() );
legendItem->setIdentifierMode( mode );
}
else if ( policy == QwtLegend::AutoIdentifier )
{
int mode = 0;
if ( QwtPolarCurve::NoCurve != style() )
{
legendItem->setCurvePen( pen() );
mode |= QwtLegendItem::ShowLine;
}
if ( QwtSymbol::NoSymbol != symbol().style() )
{
legendItem->setSymbol( symbol() );
mode |= QwtLegendItem::ShowSymbol;
}
if ( !title().isEmpty() )
{
legendItem->setText( title() );
mode |= QwtLegendItem::ShowText;
}
else
{
legendItem->setText( QwtText() );
}
legendItem->setIdentifierMode( mode );
}
legendItem->setUpdatesEnabled( doUpdate );
legendItem->update();
}