Added an `IDataTemplateHost` interface with a `IsDataTemplatesInitialized` property to prevent the need for allocating empty `DataTemplates` collections for many controls.
`IRenderer` mock was keeping hold of references passed to `AddDirty` -
tried resetting the mock but references were still held, so replaced the
mock `IRenderer` with a `NullRenderer` that fixes the problem.
These were from a time when templates were applied when
attached/detached from visual tree. Template controls are now retained
until another template is applied.
Also made a few other changes along the way:
- Add MaxClientSize to ILayoutRoot
- Store IRenderRoot in Visual and use that to calculate
IsAttachedToVisualTree
- Make Affects* methods take multiple properties
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.
Steven Kirk
Nikita Tsukanov
Steven Kirk