[Qt-interest] QTableWidget change columncount on resize

[Teaburon]

Hello!

I have subclassed QTableWidget for my current project. The widget holds
quadratic cells of the same size and each cell contains one character. The
visible items are stored in a QList<T> myItems. Now I want the table to
change its columnCount on a resize, so that the cellsize stays the same and
more (or less) items are visible if the user resizes the table. I therefore
implemented resizeEvent like this:

void MyTableWidget::resizeEvent(QResizeEvent *e) {
    if (columnCount() > 0 ) {

        int colC = e->size().width() / columnWidth(0);
        int rowC = myItems.size() / colC;

        setColumnCount(colC);
        setRowCount(rowC);
        row = col = 0;

        for(int i = 0; i < myItems.size(); ++i){
            MyItem * c = new MyItem(myItems.at(i));
            setItem(row,col,c);
            col++;
            if (col % colC == 0) {
                col = 0;
                row++;
            }
            myItems.replace(i, *c);
        }
    }
    QWidget::resizeEvent(e);
}

This works nearly the way I want, but it is slow, because of the copy action
and since myItems is very large (>2k entries)... Is there any way to achieve
this behavior without copying the items like I did?
Any advice on how to make this faster would be great!

Greetings Teaburon.
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