CODEWITHSUNDEEP
c++qteventsmouseevent
ahle6481
ahle6481

Reputation: 743

managing right and left clicks in Qt

I have a complex Qt GUI, where one part of the GUI displays a plot with various data points.

When currently left or right clicking on the plot, it returns the x-y values at the location of the click. My job is to update this so that left-click still does the same thing, but right-click selects the nearest data point and opens a context menu allows me to remove said data point. The idea is to manually be able to remove outliers.

UPDATED: I THINK that I have found the segment of code currently responsible for returning x-y values:

void plotspace::mousePressEvent(QMouseEvent*event)
{
    double trange = _timeonright - _timeonleft;
    int twidth = width();
    double tinterval = trange/twidth;

    int xclicked = event->x();

    _xvaluecoordinate = _timeonleft+tinterval*xclicked;



    double fmax = Data.plane(X,0).max();
    double fmin = Data.plane(X,0).min();
    double fmargin = (fmax-fmin)/40;
    int fheight = height();
    double finterval = ((fmax-fmin)+4*fmargin)/fheight;

    int yclicked = event->y();

    _yvaluecoordinate = (fmax+fmargin)-finterval*yclicked;

    cout<<"Time(s): "<<_xvaluecoordinate<<endl;
    cout<<"Flux: "<<_yvaluecoordinate<<endl;
    cout << "timeonleft= " << _timeonleft << "\n";

    returncoordinates();

    emit updateCoordinates();

}

Like I said, I need to turn this into left-clicking performing the same action, and right-clicking opening a context menu. Any advice would be greatly appreciated.

Upvotes: 1

Views: 495

Answers (1)

rpsml
rpsml

Reputation: 1498

You have to check which mouse button was used. Generally I prefer to deal with the mouseReleaseEvent instead of mousePressEvent as it replicates better the conventional mouse behavior. But both events work. An exemple:

void mouseReleaseEvent(QMouseEvent *e)
{
  if (e->button() == Qt::LeftButton)    // Left button...
  {
    // Do something related to the left button
  }
  else if (e->button() == Qt::RightButton)   // Right button...
  {
    // Do something related to the right button
  }
}

You can also deal with the Qt::MidButton if so you wish.

Upvotes: 1

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