C++ (Cpp) QwtLegendItem::isUpdatesEnabled Examples

Example #1

File: qwt5_histogram_item.cpp Project: Br1ndavoine/QGIS

//!  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();
}

Example #2

File: qwt_polar_curve.cpp Project: ACorradini/QGIS

//!  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();
}