- Don't log an error when the target for the root ExpressionNode is
null. This is usually because the `DataContext` hasn't been set up yet
and it spewed a load of useless error messages.
- Add a Description field to `ExpressionObserver` that can be used in
the case of e.g. #control bindings to record the whole expression (with
the "#control" part) rather than just the part tracked by the
`ExpressionObserver`.
If a TextBox is e.g. bound to an int and the user types "02" then the
TextBox text should be "02" - not the value that comes back from the
binding which will be "2".
This speeds up the common path of no data validation: this way we don't
need to get the metadata unless a binding notification is received. This
means that if a binding with data validation is assigned to a property
that isn't interested then UpdateDataValidation will be called, but the
control should just ignore it.
This is needed so that things like the following can be done:
<TreeView>
<TreeView.Styles>
<Style Selector="TreeViewItem">
<Setter Property="IsExpanded" Value="{Binding IsExpanded}"/>
</Style>
</TreeView.Styles>
<TreeView>
(At the moment we have TreeDataTemplate.IsExpanded but this isn't good
enough: it only supports setting IsExpanded on creation of the item with
no binding.)
With this commit, setters can now contain bindings, but they aren't yet
applied correctly. As part of this commit, classes related to binding
have been moved to the Perspex.Data namespace.
Some tests still failing as controls are only registered with name scope
when attached to a rooted visual tree. Need to work around this by
explicitly registering controls when applying template.
Steven Kirk
yusuf-gunaydin
danwalmsley
Nikita Tsukanov
Mikhail Kanygin