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Self referencing hierarchy RowLoaded event on Child Table Definitions

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Russ
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Russ asked on 29 Jun 2010, 08:25 PM
I've been working on an application using a multi-level self-referencing heirarchy, and have come across a problem with using the RowLoaded event for any level other than the first level.  Hopefully someone can give me a pointer on how to get this working. 

My basic goal at the moment is to disable the expand button (+) next to items that do not have a heirarchy beneath them,  I've recreated the sample from here in WPF, as a simple baseline.   I've added a little to this to try to make it work as I need (including only having heirarchies related to some items),  So I'll post my version of the code below.   As I mentioned, I'm using the RowLoaded event to decide whether or not to make the row expandable, but this only works for the first level. 

Is there a way I  can use this RowLoaded event (or another one) to do the same for levels 2 - 10 (or however deep it goes)?

Thanks,
Russell

The MainWindow.xaml:
<Window x:Class="HeirarchicalGridExample.MainWindow" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:telerikGrid="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView" 
        xmlns:telerikData="clr-namespace:Telerik.Windows.Data;assembly=Telerik.Windows.Data" 
        Title="MainWindow" Height="350" Width="525">  
    <Grid> 
        <telerikGrid:RadGridView x:Name="RadGridView1" ItemsSource="{Binding}" DataLoading="RadGridView1_DataLoading" RowLoaded="RadGridView1_RowLoaded" /> 
    </Grid> 
</Window> 

The MainWindow.xaml.cs:
using System;  
using System.Collections.Generic;  
using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Windows;  
using System.Windows.Data;  
using Telerik.Windows.Controls.GridView;  
using Telerik.Windows.Controls;  
using Telerik.Windows.Data;  
 
namespace HeirarchicalGridExample  
{  
    /// <summary> 
    /// Interaction logic for MainWindow.xaml  
    /// </summary> 
    public partial class MainWindow : Window  
    {  
        public MainWindow()  
        {  
            InitializeComponent();  
            DataContext = from i in Enumerable.Range(0, 5)  
                          select new MyObject()  
                          {  
                              ID = i,  
                              Name = String.Format("Name{0}", i),  
                              Level = 1 
                          };  
        }  
 
        public class MyObject  
        {  
            public int ID { get; set; }  
            public string Name { get; set; }  
            public int Level { get; set; }  
 
            public IEnumerable<MyObject> Items  
            {  
                get  
                {  
                    if (ID == 1 || ID == 3 || ID == 5 || ID == 7)  
                    {  
                        return from i in Enumerable.Range(0, 10)  
                               select new MyObject()  
                               {  
                                   ID = i,  
                                   Name = String.Format("{0}", Name + " - " + i.ToString()),  
                                   Level = Level + 1  
                               };  
                    }  
                    else  
                        return Enumerable.Empty<MyObject>();  
                }  
            }  
        }  
 
        private void RadGridView1_DataLoading(object sender, Telerik.Windows.Controls.GridView.GridViewDataLoadingEventArgs e)  
        {  
            var grid = (GridViewDataControl)sender;  
 
            var d = new GridViewTableDefinition();  
            d.Relation = new PropertyRelation("Items");  
            grid.TableDefinition.ChildTableDefinitions.Add(d);  
 
            grid.AutoGenerateColumns = false;  
            grid.Columns.Add(new GridViewDataColumn() { DataMemberBinding = new Binding("Level") });  
            grid.Columns.Add(new GridViewDataColumn() { DataMemberBinding = new Binding("ID") });  
            grid.Columns.Add(new GridViewDataColumn() { DataMemberBinding = new Binding("Name") });  
        }  
 
        // this is only working for the top level of the grid  
        private void RadGridView1_RowLoaded(object sender, RowLoadedEventArgs e)  
        {  
            GridViewRow row = e.Row as GridViewRow;  
            MyObject rowItem = e.DataElement as MyObject;  
 
            if (row != null && rowItem != null)  
            {  
                if (rowItem.Items.Count<MyObject>() > 0)  
                    row.IsExpandable = true;  
                else  
                    row.IsExpandable = false;  
            }  
        }  
    }  
}  
 

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Veselin Vasilev
Telerik team
answered on 02 Jul 2010, 09:39 AM
Hello Russ,

Yes, that is right. The RowLoaded event fires for the parent gridview only. If you need that event for the child (nested) grids you need to define a HierarchyChildTemplate, place a gridview inside it and subscribe to its RowLoaded event.

I am attaching a sample project here - hope it will help you.

Regards,
Veskoni
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Russ
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answered on 02 Jul 2010, 12:56 PM
Yes, Thank you.  I've just gone through your example and that seems to be exactly what I'm looking for.

Thanks for the help.

Russell.
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