Filtering lists in Qt
This article shows how to filter a list using QSortFilterProxyModel, part of the Qt model/view architecture.
Qt model/view architecture provides separated objects for presenting and handling data sources, offering great flexibility for programmers when dealing with data. In particular, the class QSortFilterProxyModel is useful for filtering/sorting data sources, mapping the source model indexes into new indexes in a transparent way.
In the next example is demonstrated how to use QSortFilterProxyModel. Two models are created. The first model, called model, is an instance of QStandardItemModel} and it is used as the primary data source. The second model, called proxy}, is an instance of QSortFilterProxyModel and it uses model as a data source. The list lsta will use model as model and the list lstb will use proxy as model.
model = new QStandardItemModel(0,3,this);
proxy = new QSortFilterProxyModel;
The user can filter lstb contents using regular expressions, wildcard or fixed string.
You can download the entire source code from File:MBA-demolist.zip. It was tested in GNU/Linux and Maemo 5 running Qt 4.6.1 but it can be compiled for other platforms as well.