how to connect an openfile signal to a widget slot?

[stampede]

What about

class MyWidget : public QWidget
{
public:
    MyWidget(QWidget *parent = 0);
public slots:
    void plotFromFile( const QString& file ){
        this->mainPlot->plotMainCurve(file);
    }
private:
    my2dPlot *mainPlot;
....
{

class MyWidget : public QWidget
{
public:
    MyWidget(QWidget *parent = 0);
public slots:
    void plotFromFile( const QString& file ){
        this->mainPlot->plotMainCurve(file);
    }
private:
    my2dPlot *mainPlot;
....
{

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