Bind DSL Model to WPF Treeview?

Question

Hi,

 

I have a simple model that represents class hierarchy:

MyModel (Domain model)

    0...* Class (Domain class)

        0...* Property (Domain class)

        0...* Class (Domain class, "class can include other classes", these are stored in "ChildSourceObjects" role)

 

I want to bind each "Name" domain property to a treeview.

Treeview is specified like this:

 

    <TreeView Grid.Column="1" Grid.Row="2" HorizontalAlignment="Stretch" Margin="13,6,0,0" <br/>
     Name="treeView1" VerticalAlignment="Stretch" Width="429" <br/>
     ItemsSource="{Binding Path=SourceObjects}" ItemTemplate="{StaticResource ObjectTemplate}" />

 

 "SourceObjects" is the domain relationship's role where all classes are stored. The ItemTemplate named "ObjectTemplate" is specified like this:

 

 <HierarchicalDataTemplate x:Key="ObjectTemplate" ItemsSource = "{Binding Path=ChildSourceObjects}">
    <TextBlock Text="{Binding Path=Name}" FontWeight="Bold" FontSize="14"/>
  </HierarchicalDataTemplate>

With this code I am able to get the correct hierarchy of Classes in the treeview, but not the Properties in those classes.

Then I removed

ItemTemplate="{StaticResource ObjectTemplate}"

from the treeview and changed the templates like this:

<HierarchicalDataTemplate x:Key="ObjectTemplate" DataType="{x:Type dsl:SourceObject}" ItemsSource = "{Binding Path=ChildSourceObjects}">
    <TextBlock Text="{Binding Path=Name}" FontWeight="Bold" FontSize="14"/>
  </HierarchicalDataTemplate>

  <HierarchicalDataTemplate x:Key="PropertyTemplate" DataType="{x:Type dsl:SourceProperty}" ItemsSource = "{Binding Path=SourceProperties}">
    <TextBlock Text="{Binding Path=Name}" FontSize="10"/>
  </HierarchicalDataTemplate>

  <DataTemplate DataType="{x:Type dsl:SourceProperty}">
    <TextBlock Text="{Binding Path=Name}"/>
  </DataTemplate>

I thought that this should work, but then even the class hierarchy is not shown in the treeview. I only element in treeview and it is the full name of the generated "SourceObject" class (namespace+class name).

Can anybody see what is wrong here?

 

BR,

Tomi

 

Answer 1

You should develop a property that merges your two collections of items (Classes and properties). This property could be a calculated property of the concept named Class.

Then, You use this new property to design your HierarchicalDataTemplate.

<TreeView ItemsSource="{Binding}">
 <TreeView.Resources>
 <HierarchicalDataTemplate DataType="{x:Type dsl:SourceObject}" ItemsSource="{Binding Items}">
  <TextBlock Text="{Binding Path=Name}" />
 </HierarchicalDataTemplate>
 <DataTemplate DataType="{x:Type dsl:SourceProperty}" >
  <TextBlock Text="{Binding Path=Name}" />
 </DataTemplate>
 </TreeView.Resources>
</TreeView>

The property "Items" can be a collection of object (so not strongly typed) or maybe an abstract parent concept (NamedElement) that had a domain property Name.

Pascal

---

http://www.netfxfactory.org/

Answer 2

Hi,

 

I'm new to DSL Toolkit, so can you point me to a right direction where I can find information about creating calculated properties in domain classes?

 

Or do you mean that I should add Tracking Property to the Class concept?

 

BR,

Tomi

Answer 3

No, it's not necessary to create a tracking property (that is a "specialized" calculated property) or a calculated property ("To set up a calculated domain property, in the Properties window, set the Kind property to Calculated. You must then add custom code to implement the property").

- Create only a new partial class for the Class concept.

public partial class Class
  {
    public IEnumerable<ModelElement> Items
    {
      get
      {
        return this.ChildSourceObjects.Union(this.SourceProperties);
      }
    }
  }

 

Pascal

---

http://www.netfxfactory.org/

Answer 4

Ahaa... It can be done that way also. Thank you for your quick reply.

 

BR,

Tomi