SRF SRF - 3 months ago 156
C++ Question

Checkbox in a header cell in QTableView

I want to have a simple column header with a checkbox that selects/ deselects all rows in a QTableView. Clicking the check box in the header causes either to select or deselect all rows.

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When I want to add a check box in a table cell, I have to just return the check state for the Qt::CheckStateRole in the data(..) for the required model indices as below. This is working as expected.

QVariant MyModel::data( const QModelIndex & rIndex, int iRole) const
{
...

if (iRole == Qt::Qt::CheckStateRole)
{
return checkstate;
}

}


But when I want to add a checkbox in a header cell, the above method is not working. Hear is my sample code.

QVariant MyModel::headerData( int iSection, Qt::Orientation eOrientation, int iRole) const
{
...

if (iRole == Qt::CheckStateRole)
{
return checkstate;
}

}


The QTableView does not call headerData() function in my model with the Qt::CheckStateRole, as it does with data() function.

Why is this behavior? How can I insert a check box in a header cell by only modifying my custom table model?

(I do not want to create a custom QTableView or QHeaderView for this purpose)

Answer

You cannot do it - Qt doesn't support check boxes in headers by default. You can read https://wiki.qt.io/Qt_project_org_faq#How_can_I_insert_a_checkbox_into_the_header_of_my_view.3F for further information and its realization using custom QHeaderView

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