I would like to create a WPF UserControl that can display data in different layouts, in the main table, group box and tabbed tab. I would like the control to be such that it can accept recursively. For example, I would like to display a table with a group box in one of my cells and again split the table inside the group box.
For this, I used TemplateSelector ("GenericLayoutTemplateSelector") as a top-level element in xaml with different templates. For the layout of the table, I wanted to use the example “Linking ListView with Data Matrix” in the code project: http://www.codeproject.com/Articles/36462/Binding-a-ListView-to-a-Data-Matrix
The codeproject example works fine, but when I use it in my context, it fails. Since the only change I made was put in xaml inside the datatemplate / template selector, I think the problem could be related to this.
<DataTemplate x:Key="TableTemplate"> <Border BorderThickness="2" BorderBrush="SteelBlue"> <ListView x:Name="TableLayoutListView" tableLayout:ListViewExtension.MatrixSource="{Binding Converter={StaticResource ListToMatrixConverter}}"> <ListView.View> <GridView> <GridViewColumn DisplayMemberBinding="{Binding Path=[0]}" Header="Dummy" CellTemplateSelector="{DynamicResource GenericLayoutTemplateSelector}"/> </GridView> </ListView.View> </ListView> </Border> </DataTemplate>
This fails at the point where the GridView is retrieved inside the ListViewExtension.MatrixSource:
private static void OnMatrixSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { ListView listView = d as ListView; Matrix matrix = e.NewValue as Matrix; listView.ItemsSource = matrix; GridView gridView = listView.View as GridView; DataTemplateSelector cellTemplateSelector = gridView.Columns.First().CellTemplateSelector;
ListView.View is null. I can create a GridView in the code and assign it to listView.View, but then I do not have access to the GenericTemplateSelector, which I wanted to use CellTemplateSelector for the GridView.
Any ideas why listView.View is null, what can I do about it?
Edit: SledgeHammer made this obvious, what I'm trying to do is a bad hack, and it failed. The proper way to do this is to pass the GenericTemplateSelector directly to the attached property, and not through the dummy GridView table.
I am trying to figure out a way to do this: my idea is to have an attached property with a multiply connected interface.
<DataTemplate x:Key="TableTemplate"> <Border BorderThickness="2" BorderBrush="SteelBlue"> <ListView x:Name="TableLayoutListView"> <tableLayout:ListViewExtension.MatrixSourceWithTemplateSelector> <MultiBinding Converter={StaticResource ListToMatrixConverter}> <Binding Path="this" /> <Binding {DynamicResource GenericLayoutTemplateSelector}/> </MultiBinding> </tableLayout:ListViewExtension.MatrixSourceWithTemplateSelector>
However, this is not a valid haml. Any ideas how to get {DynamicResource GenericLayoutTemplateSelector} in a multi-connected?