Hiding and displaying legend items not working in 6.1 as did in 6.0

[EliGri]

Hi,
I'm porting to Qwt 6.1 from 6.0 and am having touble getting legend items to hide and display themselves, depending on wheather they are being displayed in a QwtPlot chart. Any hints? Any help much appreciated.

Below is a method for 6.0 that worked, and below that is the same method i'm trying to implement for 6.1 that doesn't work. All of the code below implemented in a QwtPlot subclass.

void SingleLogTrack::slotSimplifyLegend(bool on) {  // works for Qwt 6.0
   bool showit = true;
   foreach (QwtPlotItem *plt_item, itemList()) {
      if ( plt_item->rtti() == QwtPlotItem::Rtti_PlotCurve ) {
         QwtPlotCurve *c = (QwtPlotCurve*)(plt_item);
 
         if (on) showit = c->isVisible();
         c->setItemAttribute(QwtPlotItem::Legend,showit);
 
         if (!on) {
            QWidget *w = legend()->find(plt_item);
            if ( w && w->inherits("QwtLegendItem" ) ) {
               ((QwtLegendItem *)w)->setChecked(c->isVisible());
            }
         }
 
      }
   }
}

void SingleLogTrack::slotSimplifyLegend(bool on) {  // works for Qwt 6.0
   bool showit = true;
   foreach (QwtPlotItem *plt_item, itemList()) {
      if ( plt_item->rtti() == QwtPlotItem::Rtti_PlotCurve ) {
         QwtPlotCurve *c = (QwtPlotCurve*)(plt_item);
      
         if (on) showit = c->isVisible();
         c->setItemAttribute(QwtPlotItem::Legend,showit);

         if (!on) {
            QWidget *w = legend()->find(plt_item);
            if ( w && w->inherits("QwtLegendItem" ) ) {
               ((QwtLegendItem *)w)->setChecked(c->isVisible());
            }
         }

      }
   }
}

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void SingleLogTrack::slotSimplifyLegend(bool on) {   // not yet working for Qwt 6.1
   bool showit = true;
   foreach (QwtPlotItem *plt_item, itemList()) {
      if ( plt_item->rtti() == QwtPlotItem::Rtti_PlotCurve ) {
         QwtPlotCurve *c = (QwtPlotCurve*)(plt_item);
 
         if (on) showit = c->isVisible();
         c->setItemAttribute(QwtPlotItem::Legend,showit);
 
         if (!on) {
            QwtLegend *lgd = qobject_cast<QwtLegend *>(legend());
            QList<QWidget *> legendWidgets = lgd->legendWidgets(itemToInfo(plt_item));
 
            if ( legendWidgets.size() == 1 ) {
               QwtLegendLabel *b = qobject_cast<QwtLegendLabel *>(legendWidgets[0]);
               if ( b && b->inherits("QwtLegendLabel") )
                  ((QwtLegendLabel *)b)->setChecked(c->isVisible());
            }
        }
 
      }
   }
}

void SingleLogTrack::slotSimplifyLegend(bool on) {   // not yet working for Qwt 6.1
   bool showit = true;
   foreach (QwtPlotItem *plt_item, itemList()) {
      if ( plt_item->rtti() == QwtPlotItem::Rtti_PlotCurve ) {
         QwtPlotCurve *c = (QwtPlotCurve*)(plt_item);
        
         if (on) showit = c->isVisible();
         c->setItemAttribute(QwtPlotItem::Legend,showit);

         if (!on) {
            QwtLegend *lgd = qobject_cast<QwtLegend *>(legend());
            QList<QWidget *> legendWidgets = lgd->legendWidgets(itemToInfo(plt_item));

            if ( legendWidgets.size() == 1 ) {
               QwtLegendLabel *b = qobject_cast<QwtLegendLabel *>(legendWidgets[0]);
               if ( b && b->inherits("QwtLegendLabel") )
                  ((QwtLegendLabel *)b)->setChecked(c->isVisible());
            }
        }

      }
   }
}

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