Hi
I have DataModel
Country -> List<City>
and this is shown in RadTreeView with load on demand.
I need to know at any time full path to selection in TreeView ( I call different function depending on Selectiion in Tree).
How to achive this?
If I take example from documentation :
http://www.telerik.com/help/silverlight/radtreeview-how-to-get-previous-next-parent-sibling-node.html
it gives error.
I need to know at any time what is full path to selection in TreeView. How to achive this.
Sample project attached.
Pls help.
public partial class MainPage : UserControl
{
Model.ViewModel vm;
public MainPage()
{
InitializeComponent();
vm = new Model.ViewModel();
this.DataContext = vm;
}
private void RadTreeView_LoadOnDemand(object sender, Telerik.Windows.RadRoutedEventArgs e)
{
RadTreeViewItem currentItem = e.OriginalSource as RadTreeViewItem;
Country country = currentItem.Item as Country;
if (country != null)
{
vm.LoadCities(country);
}
City city = currentItem.Item as City;
if (city != null)
{
currentItem.IsLoadOnDemandEnabled = false;
var c = currentItem.ParentItem.Item as Country;
vm.LoadExtraData(c, city);
}
}
private void RadTreeView_ItemPrepared(object sender, RadTreeViewItemPreparedEventArgs e)
{
RadTreeViewItem item = e.PreparedItem as RadTreeViewItem;
if (item != null && item.Item is City)
{
item.IsLoadOnDemandEnabled = false;
}
}
private void RadTreeView_SelectionChanged(object sender, Telerik.Windows.Controls.SelectionChangedEventArgs e)
{
// Get a reference to the treeview
Telerik.Windows.Controls.RadTreeView treeView = sender as Telerik.Windows.Controls.RadTreeView;
// Get the currently selected items
ObservableCollection<Object> selectedItems = treeView.SelectedItems;
//Here always null!!!!!!!!!!!!!!!!!!!!!!!!!!!! because selectedItem is not RadTreeViewItem - it is Country or City
RadTreeViewItem item = selectedItems[0] as RadTreeViewItem;
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
// Get the previous item and the previous sibling item
RadTreeViewItem previousItem = item.PreviousItem;
RadTreeViewItem previousSiblingItem = item.PreviousSiblingItem;
// Get the next item and the next sibling item
RadTreeViewItem nextItem = item.NextItem;
RadTreeViewItem nextSiblingItem = item.NextSiblingItem;
// Get the parent item and the root item
RadTreeViewItem parentItem = item.ParentItem;
RadTreeViewItem rootItem = item.RootItem;
}
}
public class ViewModel : ModelBase
{
public ObservableCollection<Country> Countries { get; set; }
public ViewModel()
{
Countries = new ObservableCollection<Country>();
LoadCountries();
}
private Country _SelectedCountry;
public Country SelectedCountry
{
get { return _SelectedCountry; }
set { _SelectedCountry = value; RaisePropertyChanged("SelectedCountry"); }
}
private City _SelectedCity;
public City SelectedCity
{
get { return _SelectedCity; }
set { _SelectedCity = value; RaisePropertyChanged("SelectedCity"); }
}
private object _SelectedItem;
public object SelectedItem
{
get { return _SelectedItem; }
set { _SelectedItem = value; RaisePropertyChanged("SelectedItem"); }
}
public void LoadCountries()
{
Countries.Add(new Country() { Name = "US" });
Countries.Add(new Country() { Name = "Canada" });
}
public void LoadCities(Country country)
{
if (country.Name == "US")
{
country.Cities.Add(new City() { Name = "NY", Count = 1 });
country.Cities.Add(new City() { Name = "Atlanta", Count = 2 });
}
if (country.Name == "Canada")
{
country.Cities.Add(new City() { Name = "Toronto", Count = 3 });
country.Cities.Add(new City() { Name = "Vancouver", Count = 4 });
}
}
//here I call method that takes only country - means root item selected in the tree.
public void LoadExtraData(Country country)
{
//call to WCF with parameter country
SelectedCountry = country;
}
// here I need full path - country and city..
public void LoadExtraData(Country country, City city)
{
//call to WCF with parameters country and city
SelectedCountry = country;
SelectedCity = city;
}
}