[Qt-interest] boolean field checkbox QTableView

[Andreas Pakulat]

On 11.02.09 10:50:42, Christopher Rasch-Olsen Raa wrote:
> Onsdag 11 februar 2009 09:55:46 skrev Linos:
> > Hello,
> > I have a QTableView with a QSqlRelationalTableModel and i want the boolean
> > colums to be checkboxes in display and edit, I have searching the forum but
> > i have not understand the full picture here i think, i have tried two ways
> > to do that:
> >
> > -Create a QItemDelegate subclass and reimplement the methods createEditor,
> > setEditorData, setModelData and updateEditorGeometry to represent a
> > checkbox on edit.
> >
> > -Create a QSortProxyModel subclass and reimplement flags to add a
> > Qt.ItemIsUserCheckable on the boolean column an check for
> > Qt::CheckStateRole in data method to reply with the boolean value of the
> > column.
> >
> > If i use the sortproxymodel i get the checkbox in display with the correct
> > values but i still see the "true, false" strings and to change the value i
> > get a combobox with the values true or false.
> >
> > If i use the delegate i get the checkbox to edit on doble click but i dont
> > see checkboxes in display mode, only my well know "true, false" strings.
> >
> > If i use the delegate and the sortproxymodel i get a checkbox on the left
> > of the cell on display mode and when i try to change the value i see other
> > checkbox at the right of the first where i can change the value, after i
> > commit the change the second checkbox is gone and the left display checkbox
> > shows the change.
> >
> > Do i have any way to have a checkbox column in display and edit (the same)
> > and not see the text "true, false"?
>
> I recently looked for a way to do this myself. What I had to do was create a 
> QItemDelegate and use that on the checkable column. Next I subclassed 
> QSqlTableWidget and overloaded flags() so that returned the proper flags for 
> that column. Next I used QTableView::openPersistentEditor() on the fields in 
> the checkable column to make them always display. There are some clues to be 
> found in the demo-applications.

I haven't use the sql-models/views yet myself but isn't it easier to
subclass QSqlTableModel, overwrite flags() as needed there (returning
Qt::UserCheckable for the right column) and then also data() to return a
meaningful value for the Qt::CheckStateRole. Then put the model into a
plain old QTableView and it just works. Without a custom item delegate or
anything else. At least this approach works with custom models as well as
QStandardItemModel.

Andreas

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