QwtPlotPicker double click

[mqt]

Searched but I could not found any thread on this.
How to capture a double click Signal from QwtPlotPicker?

[Uwe]

A picker machine for double clicks looks like this:

class DoubleClickMachine: public QwtPickerMachine
{
public:
    DoubleClickMachine():
        QwtPickerMachine( PointSelection )
    {
    }
 
    virtual QList<Command> transition(
        const QwtEventPattern &, const QEvent *event )
    {
        QList<QwtPickerMachine::Command> cmdList;
 
        if ( event->type() == QEvent::MouseButtonDblClick )
        {
            cmdList += Begin;
            cmdList += Append;
            cmdList += End;
        }
 
        return cmdList;
    }
};

class DoubleClickMachine: public QwtPickerMachine
{
public:
    DoubleClickMachine():
        QwtPickerMachine( PointSelection )
    {
    }

    virtual QList<Command> transition(
        const QwtEventPattern &, const QEvent *event )
    {
        QList<QwtPickerMachine::Command> cmdList;

        if ( event->type() == QEvent::MouseButtonDblClick )
        {
            cmdList += Begin;
            cmdList += Append;
            cmdList += End;
        }

        return cmdList;
    }
};

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and

QwtPlotPicker *picker = new QwtPlotPicker( plot->canvas() );
picker->setStateMachine( new DoubleClickMachine() );
connect( picker, SIGNAL( selected( const QPointF & ) ), ... );

QwtPlotPicker *picker = new QwtPlotPicker( plot->canvas() );
picker->setStateMachine( new DoubleClickMachine() );
connect( picker, SIGNAL( selected( const QPointF & ) ), ... );

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Uwe