code snippets for "MVP In Silverlight/WPF: Implementing The Overview UserControl" post, part III

s1.cs

public interface IUserGroupsView : IView
{
    void ExpandTreeView();
    void HideAddNewButton();
    void SelectItemInTreeView(HierarchicalUserGroupBindingModel userGroupModel);
}

s2.xaml

<MVP:View x:Class="SilverlightMVP.Client.Views.UserGroups"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:Controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
       xmlns:Windows="clr-namespace:System.Windows;assembly=System.Windows.Controls"
       xmlns:MVP="clr-namespace:SilverlightMVP.Client.Infrastructure.MVP">
  
    <Grid Background="White">
  
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
  
        <Controls:TreeView x:Name="UserGroupsTreeView" ItemsSource="{Binding UserGroups}"
                          SelectedItemChanged="UserGroupsTreeView_SelectedItemChanged" Grid.Row="0" >
            <Controls:TreeView.ItemTemplate>
                <Windows:HierarchicalDataTemplate ItemsSource="{Binding Children}">
                    <TextBlock Text="{Binding Path=Name}" />
                </Windows:HierarchicalDataTemplate>
            </Controls:TreeView.ItemTemplate>
        </Controls:TreeView>
  
        <Button x:Name="AddNewButton" Content="Create new usergroup" Click="AddNewButton_Click"
               Margin="5" Grid.Row="1" />
  
    </Grid>
</MVP:View>

s3.cs

public interface IUserGroupsView : IView
{
    void ExpandTreeView();
    void HideAddNewButton();
    void SelectItemInTreeView(HierarchicalUserGroupBindingModel userGroupModel);
}
 
public partial class UserGroups : IUserGroupsView
{
    private readonly UserGroupsPresenter presenter;
 
    public UserGroups()
    {
        InitializeComponent();
        presenter = CreateAndInitializePresenter<UserGroupsPresenter>();
    }
 
    public void SelectItemInTreeView(HierarchicalUserGroupBindingModel userGroupModel)
    {
        UserGroupsTreeView.SelectItem(userGroupModel);
    }
 
    public void ExpandTreeView()
    {
        for (int i = 0; i < UserGroupsTreeView.Items.Count; i++)
        {
            ExpandAllTreeViewItems((TreeViewItem)UserGroupsTreeView.ItemContainerGenerator.ContainerFromIndex(i));
        }
    }
 
    private void ExpandAllTreeViewItems(TreeViewItem treeViewItem)
    {
        if (!treeViewItem.IsExpanded)
        {
            treeViewItem.IsExpanded = true;
            treeViewItem.Dispatcher.BeginInvoke(() => ExpandAllTreeViewItems(treeViewItem));
        }
        else
        {
            for (int i = 0; i < treeViewItem.Items.Count; i++)
            {
                var child = (TreeViewItem)treeViewItem.ItemContainerGenerator.ContainerFromIndex(i);
                ExpandAllTreeViewItems(child);
            }
        }
    }
 
    public void HideAddNewButton()
    {
        AddNewButton.Visibility = Visibility.Collapsed;
    }
 
    private void UserGroupsTreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
    {
        presenter.DealWithSelectedUserGroup((HierarchicalUserGroupBindingModel)e.NewValue);
    }
 
    private void AddNewButton_Click(object sender, RoutedEventArgs e)
    {
        presenter.PrepareUserGroupCreation();
    }
}