Hey all,

We have uploaded Wt 2.2.1 was uploaded to sourceforge.

As usual, this release is a mix of bug fixes, improvements, and new
features. All changes were recorded in the Changelog.

The most note-worthy new additions:

 - The WAbstractItemModel interface and the WStandardItemModel
implementation now support hierarchical models. This may break
existing code if you have implemented your own model or implemented
your own view class (see the release notes
[http://www.webtoolkit.eu/wt/doc/reference/html/Releasenotes.html] for
details).

 - The WTreeView widget uses the new WAbstractItemModel to implement
an MVC-based tree (table) view component. Learning from existing
experience with WTreeTable and Ext::TableView, this widget has been
designed to be able to deal with large models. Not only is data loaded
incrementally as you expand nodes, also only visible nodes are loaded
into the browser (with some margin). Invisible nodes are stubbed and
replaced with real content as needed. In this way we support
arbitrarily large models with constant memory usage both in the
browser and the server, and a responsive user interface. See the new
treeview example for how to use it (this example is not yet available
online).

Development on this widget is ongoing. Most notably, there is not yet
any support for editing the underlying model, and no general support
for delegates which allow you to have more control of how cell
contents should be rendered.

 - A widgetgallery example was added that demos most of the widgets
and features in Wt.

 - WSubMenuItem extends WMenuItem to hold a sub menu (see the widget
gallery example for its usage).

Regards,
koen

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