removeColumn in QTableWidget too slow

[angela2016]

Hi,

I have a QTableWidget that is filled with a 2D QVector. There is a "compact view" option which basically shows only part of the vector depending on the item value, so after inserting the data I have to remove the unnecessary columns.

Currently, I'm setting up the QTableWidget with all columns (setColumnCount(540); for testing), then fill in the data and delete the columns in a loop:

for (int vC = vColumnsTotal - 1; vC > vMaxColumn-1; vC--) { 
        removeColumn(vC);
    }

But this is extremely slow. Filling the table takes about 2 seconds, removing the columns about 40-50 seconds. I've tried:

setUpdatesEnabled(false);
setDisabled(true);
setVisible(false);

but saw no effect.

If I use

setColumnCount(vMaxColumn);

instead it works very fast, but presumably that only works if I want to remove the last columns which won't necessarily be the case later in the code.

Is there anything I can disable to make the removal faster? Thanks.

[VRonin]

Do not remove, just hide: http://doc.qt.io/qt-5/qtableview.html#setColumnHidden

for (int vC = vColumnsTotal - 1; vC > vMaxColumn-1; vC--) { 
        setColumHidden(vC,true);
    }

[angela2016]

Thanks, hiding the column works a lot faster. I'm not sure it that'll give me other problems but for now I made it work.