Chart and Legend

[pixel]

Hi,

after i finished learning path "Introduction to Qt Widgets with KDAB" im trying to create own QT Application wit QT Creator.
Now im stuck in an issue trying to show context menu when user make right click on the chart, my goal is to show a context menu when a user has
used mouse right click on a Chart Legend, but im not able to find a chart legend position, or how to check what is under my cursor currently,
for this i used event filter, this part works, but how to catch mouse right click on QLegend, is this possible?

This is how im try to connect to QLegend:

connect(m_Chart->legend(), &QLegend::clicked,
            this, &MyChartView::onLegendClicked);

Edit: i saw there is no signal "clicked", but QLegendMarker has one, if my first is not possible to use, can we use for this QLegendMarker's signal "clicked" to catch the right mouse event?

Thanks for any help

[Jacek Marcin Jaworski]

You have two options:

1. Inherit QLegend and code your own virtual MyLegend::mousePressEvent(QGraphicsSceneMouseEvent *) function;
2. Use QLegend::installEventFilter function.
   You have call it in the window constructor with this as param.
   Then in your window you have implement function (this is not compiled and not tested code):

bool MyWindowWithLegend::eventFilter(QObject* o, QEvent* e)
{
   if(o != myLegendObject)
      return false; // Event not recognized - propagate it to next widget.
   QMouseEvent* e2 = dynamic_cast<QMouseEvent*>(e);
   if(!e2)
      return false; // Event not recognized - propagate it to next widget.
   if(e2->button() == Qt::RightButton)
   {
      // Your popup code here
      return true; // Event recognized and used properly - do no propagate it to next widget.
   }
   return false; // Event not recognized - propagate it to next widget.
}

[pixel]

@Jacek-Marcin-Jaworski
hi, thank you for your answer, i will try to implement tomorrow.

Regards
pixel

[SimonSchroeder]

The clicked() signal is usually for the left click. However, for QWidgets you can setContextMenuPolicy() to Qt::CustomContextMenu. Then you should connect to customContextMenuRequested(). This signal will even give you the position where to show the context menu.

[pixel]

Hi guys,
i was able to solve my issue but i have to say i used help from AI,
and now i have 2 solutions one is using eventFilter and second one is using customContextMenuRequested.

Thanks for your suggestions
best regards
pixel