painter event and combo box to draw lines

[viniltc]

Hi,

I have a paintEvent to draw lines. There is a ComboBox to select to draw line 1 or 2 . For ex. if the Combobox index is 0 draw line 1 or index 1 draw line 2. I did as follows

void MainWindow::paintEvent(QPaintEvent *e)
{
    QPainter painter1(this);

    QPen linepen1(Qt::darkRed);
    linepen1.setWidth(2);


    int comboVal = 0;
    comboVal = ui->comboBox->currentIndex(); // combo box value

    switch (comboVal)
    {
     case 0:

        painter1.setPen(linepen1);
        painter1.drawLine(p11,p12);
        break;

     case 1:
        
        painter1.setPen(linepen1);
        painter1.drawLine(p11,p13);
        break;
    }

}

The problem is that drawing is not "real-time" when selecting the Combobox index. Do you see an issue here?

[mpergand]

Hi,

Each time the combo value changes, you need to redraw the view by calling update().

[viniltc]

@mpergand thanks a lot. update solves the issue!