Cusomize QFileDialog: add new column to the file view of the QFileDialog

[anda_skoa]

Your columnCount() method signature does not match the one from QAbstractItemModel, i.e. it is missing the const.

As far as C++ goes that is an overload and not invoked when the model's column count is to be evaluated. That still calls the one from QSortFilterProxyModel.

Cheers,
_

[polynom]

Thank you for helping me.
Now the new column is displaying. With the name: "Notifications". Perfect.
But no contents of the new column is displaying. I expects that there are displaying random numbers.
In the overwritten

QVariant QFileDialogProxyModel::data(const QModelIndex &index, int role/* = Qt:isplayRole*/) const[LIST]

method I have added a breakpoint to

return QString::number(rand() % 10); // add custom column! at the moment a random number

but the Debugger do not stop here.
And I cannot choose a file anymore. I can select a file, but no file is displayed in the "File Name" QLineEdit and the "OK" Button is disabled.

[anda_skoa]

Does your data() method get called at all?
Its signature looks right, so it should be.

Cheers,
_

[polynom]

Yes, method:
QVariant QFileDialogProxyModel::data(const QModelIndex &index, int role/* = Qt:isplayRole*/)
is called, but I don´t get a index (index.column() == 4) and probably therefore my columns are empty.
Should I call createIndex and create a new QModelIndex which will have a column==4?
But I think, that I will modify the main model and not the proxy model.

[anda_skoa]

Yes, try overwriting the index() method and handle creation of indexes for your column yourself.
Another thing, just to make sure it isn't he cause, would be to always return 5 in the columnCount method,

Cheers,
_

[polynom]

I have overwritten the index() method and handle the custom column in the proxy model itself.
Now a custom column is displayed with a custom header and custom contents. perfect.
But I have another problem with the selection of a file.
I cannot choose a file anymore. I can select a file, but no file is displayed in the "File Name" QLineEdit and the "OK" Button is disabled.
The following methods are also overwritten in the QFileDialogProxyModel class: (the signature i have already checked)

virtual QItemSelection mapSelectionToSource ( const QItemSelection & proxySelection ) const;
virtual QItemSelection	mapSelectionFromSource ( const QItemSelection & sourceSelection ) const;
 
QItemSelection	QFileDialogProxyModel::mapSelectionFromSource ( const QItemSelection & sourceSelection ) const{
	return QSortFilterProxyModel::mapSelectionFromSource(sourceSelection);
}
 
 
 
QItemSelection QFileDialogProxyModel::mapSelectionToSource ( const QItemSelection & proxySelection ) const{
	return QSortFilterProxyModel::mapSelectionToSource(proxySelection);
}

virtual QItemSelection mapSelectionToSource ( const QItemSelection & proxySelection ) const;
virtual QItemSelection	mapSelectionFromSource ( const QItemSelection & sourceSelection ) const;

QItemSelection	QFileDialogProxyModel::mapSelectionFromSource ( const QItemSelection & sourceSelection ) const{
	return QSortFilterProxyModel::mapSelectionFromSource(sourceSelection);
}



QItemSelection QFileDialogProxyModel::mapSelectionToSource ( const QItemSelection & proxySelection ) const{
	return QSortFilterProxyModel::mapSelectionToSource(proxySelection);
}

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but the debugger doesn´t stop here at no time.
I expected that I get a debugger stop at Line 5 or Line 11.

[anda_skoa]

Maybe also needs to implement mapFromSource/mapToSource?

Cheers,
_