How to enhace the left most button of QTableView with QAbstractTableModel to have a checkbox functionality

Qt Enthusiast

How to enhance the leftmost button of QTableView with QAbstractTableModel

I have QTableView and it is using QAbstractTableModel . When I click on LeftMost button it selects All the rows in QtableView like microsoft Excel .

Is it possible to enhance this corner most button as check box and when I click on this checkbox then it selects All the all the rows on this item and when I unlick it deselects all the items in the QtableView

sneubert

Hi,

the most left button is the row header, where you can only set text, font, etc. in QAbstractItemModel::headerData. My suggestion is to add a column to you model with

Qt::ItemFlags QAbstractItemModel::flags(const QModelIndex &index) const
{
    if(index.column() == 0)
        return (QAbstractTableModel::flags(index) | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable);
    return QAbstractTableModel::flags(index);
}

to display a user clickable checkbox in the first column. You implementation of data has to return the checked state

QVariant QAbstractItemModel::data(const QModelIndex &index, int role) const
{
         /* your return for Qt:DisplayRole */

        if(role == Qt::CheckStateRole)
        {
            if(index.column() == 0)
            {
                return //your check state for index.row()
            }
        }
    }
    return QVariant();
}

You can than use setData of your model to select / unselect the entire row if the user checks / unchecks the checkbox

bool QAbstractItemModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if(index.column() == 0 && role == Qt::CheckStateRole)
    {
        /* save checked state and select / deseclect row */
        return true;
    }
    return false;
}

VRonin

    QAbstractButton *cornerButton = tableWidget->findChild<QAbstractButton*>();
    if (cornerButton) 
    {
       cornerButton->disconnect();
       connect(cornerButton, SIGNAL(clicked()), ..., ...);
    }

Source: http://www.qtcentre.org/threads/31156-Cutom-signal-on-mouse-click-at-top-left-corner-of-QTableWidget