How to make a column in QTableWidget read only?

Question

I would like to have one column in QTableWidget NOT editable.
In forums I have read a lot about some flags but could not manage to implement.

Narek · Accepted Answer · 2012-10-10T07:46:48.347

110

Insert into the QTableWidget following kind of items:

QTableWidgetItem *item = new QTableWidgetItem();
item->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEnabled);

Works fine!

EDIT:

QTableWidgetItem *item = new QTableWidgetItem();
item->setFlags(item->flags() ^ Qt::ItemIsEditable);

This is a better solution. Thanks to @priomsrb.

edited Oct 10 '12 at 07:46

answered Apr 04 '10 at 10:12

Narek

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It would be better to use `item->setFlags(item->flags() ^ Qt::ItemIsEditable);`. This will leave the other flags intact – priomsrb Jul 01 '12 at 11:01
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@priomsrb Why do you use an exclusive or (XOR) instead of `item->flags() & ~Qt::ItemIsEditable` as suggested by user2923436? The result of XOR depends on the default state of the flags. – m7913d Aug 28 '17 at 20:07
@m7913d I think you're right. My solution just toggles the editable state. So it wouldn't work if the item was already read only. – priomsrb Aug 30 '17 at 00:38

score 52 · Answer 2 · edited Sep 09 '15 at 21:20

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The result of using XOR depends on what the current state is. I'd suggest using

item->setFlags(item->flags() &  ~Qt::ItemIsEditable);

to make sure editing is turned off regardless of the current setting.

edited Sep 09 '15 at 21:20

Angie Quijano

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answered Oct 26 '13 at 17:14

user2923436

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I tried this solution of yours and it didn't work: the compiler complained about the '~'. – Momergil Apr 12 '16 at 12:22
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`~` is bitwise negation and should be supported by all compilers. – kocica Aug 01 '18 at 12:07

score 2 · Answer 3 · answered Jul 30 '14 at 13:50

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I came to a better suggestion, just overwrite the cellDoubleClicked signal with a new SLOT. This is, if you want none of the cells to be modified

answered Jul 30 '14 at 13:50

Damdidam

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No need to do that, that's why we have item flags. Just one line to fix his problem. – reggie Jul 31 '14 at 09:09
The difference is you would have to exclude the flag from the bitmap on all his child items?. My suggestion was to exclude writing 20 lines with &~ bitmap flag if you want the entire widget to be readonly. Actually my comment was wrong anyway, it should say disconnect the cellDoubleClicked signal – Damdidam Aug 11 '14 at 15:03

score 0 · Answer 4 · answered Jun 16 '14 at 19:56

To apply @Narek's code to rows or columns, simply use a simple for loop and put a condition in to include the flags for rows/columns you do not want to be editable.

The following code reads a csv file into a QTableWidget:

if(!rowOfData.isEmpty()){
for (int x = 0; x < rowOfData.size(); x++)
    {
        rowData = rowOfData.at(x).split(",");
        if(ui->table_Data->rowCount() <= x) ui->table_Data->insertRow(x);
        for (int y = 0; y < rowData.size(); y++)
        {
            QTableWidgetItem *item = new QTableWidgetItem(rowData[y],QTableWidgetItem::Type);
            if( y < 3 ) item->setFlags(item->flags() ^ Qt::ItemIsEditable);   // Only disables the first three columns for editing, but allows the rest of the columns to be edited
            ui->table_Data->setItem(x,y,item);
            ui->table_Data->repaint();
        }
    }
}

How to make a column in QTableWidget read only?

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