I'm trying to bind TreeView item double click event to my view model. It actually works, only I would like to know which item was selected, and binding to SelectedItem doesn't work (param is null):
<TreeView CommandBehaviors:MouseDoubleClick.Command="{Binding Connect}" CommandBehaviors:MouseDoubleClick.CommandParameter="{Binding Path=SelectedItem}" Grid.Column="0" HorizontalAlignment="Stretch" DockPanel.Dock="Left" ItemsSource="{Binding Path=ServerItems, UpdateSourceTrigger=PropertyChanged}"> <TreeView.ItemTemplate> <HierarchicalDataTemplate ItemsSource="{Binding Databases}"> <TextBlock Text="{Binding}" /> </HierarchicalDataTemplate> </TreeView.ItemTemplate> </TreeView> Command behaviors:
public class MouseDoubleClick { public static DependencyProperty CommandProperty = DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(MouseDoubleClick), new UIPropertyMetadata(CommandChanged)); public static DependencyProperty CommandParameterProperty = DependencyProperty.RegisterAttached("CommandParameter", typeof(object), typeof(MouseDoubleClick), new UIPropertyMetadata(null)); public static void SetCommand(DependencyObject target, ICommand value) { target.SetValue(CommandProperty, value); } public static void SetCommandParameter(DependencyObject target, object value) { target.SetValue(CommandParameterProperty, value); } public static object GetCommandParameter(DependencyObject target) { return target.GetValue(CommandParameterProperty); } private static void CommandChanged(DependencyObject target, DependencyPropertyChangedEventArgs e) { Control control = target as Control; if (control != null) { if ((e.NewValue != null) && (e.OldValue == null)) { control.MouseDoubleClick += OnMouseDoubleClick; } else if ((e.NewValue == null) && (e.OldValue != null)) { control.MouseDoubleClick -= OnMouseDoubleClick; } } } private static void OnMouseDoubleClick(object sender, RoutedEventArgs e) { Control control = sender as Control; ICommand command = (ICommand)control.GetValue(CommandProperty); object commandParameter = control.GetValue(CommandParameterProperty); command.Execute(commandParameter); } } Relevant part of ViewModel:
public class MainViewModel : BaseViewModel { #region commands private ICommand _connect; public ICommand Connect { get { if (_connect == null) { _connect = new PGAdmin.Commands.Generic.RelayCommand(param => ConnectToDatabase(param)); } return _connect; } set { _connect = value; } } #endregion public void ConnectToDatabase(object param) { DebugPopup.Show(param.ToString()); } } Another question - if I make this work - what would I get in the param parameter - I mean - can I somehow get to the underlying item of my observable collection?
