MvvmLight EventToCommand and WPFToolkit DataGrid double click

Question

Trying to figure out how to use EventToCommand to set the datagrid double-click handler for rows. The team lives in a viewmodel for each row. There is just so much of my experience since I have not used interaction yet.

Thanks.

I would use the mvvmlight tag, but I don’t have enough impressions to create new tags.

Answer 1

This would be a solution if the team lives on "GridVieModel" and not on "RowViewModel".

    <Window...    
         ...xmlns:dg="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" 
            xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" 
            xmlns:GalaSoft_MvvmLight_Command="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras">
         <dg:DataGrid x:Name="dg">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="MouseDoubleClick">
                            <GalaSoft_MvvmLight_Command:EventToCommand CommandParameter="{Binding SelectedItem, ElementName=dg}" Command="{Binding Path=SelectCommand, Mode=OneWay}"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
            </dg:DataGrid>
    </Window>

rowview, mousedoubleclick () rowview.

:

<GalaSoft_MvvmLight_Command:EventToCommand Command="{Binding SelectedItem, ElementName=dg, Mode=OneWay, Converter=...}"/>

, (- ISelectCommandable RelayCommand)

Answer 2

, - , EventToCommand

public class DataGridAttachedBehaviors
{
   #region DoubleClick

   public static DependencyProperty OnDoubleClickProperty = DependencyProperty.RegisterAttached(
       "OnDoubleClick",
       typeof(ICommand),
       typeof(DataGridAttachedBehaviors),
       new UIPropertyMetadata(DataGridAttachedBehaviors.OnDoubleClick));

   public static void SetOnDoubleClick(DependencyObject target, ICommand value)
   {
      target.SetValue(DataGridAttachedBehaviors.OnDoubleClickProperty, value);
   }

   private static void OnDoubleClick(DependencyObject target, DependencyPropertyChangedEventArgs e)
   {
      var element = target as Control;
      if (element == null)
      {
         throw new InvalidOperationException("This behavior can be attached to a Control item only.");
      }

      if ((e.NewValue != null) && (e.OldValue == null))
      {
         element.MouseDoubleClick += MouseDoubleClick;
      }
      else if ((e.NewValue == null) && (e.OldValue != null))
      {
         element.MouseDoubleClick -= MouseDoubleClick;
      }
   }

   private static void MouseDoubleClick(object sender, MouseButtonEventArgs e)
   {
      UIElement element = (UIElement)sender;
      ICommand command = (ICommand)element.GetValue(DataGridAttachedBehaviors.OnDoubleClickProperty);
      command.Execute(null);
   }

   #endregion DoubleClick

  #region SelectionChanged
  //removed
  #endregion
}

xaml:

<dg:DataGrid.RowStyle>
   <Style BasedOn="{StaticResource DataGridDemoRowStyle}"           
          TargetType="{x:Type dg:DataGridRow}">
       <Setter Property="skins:DataGridAttachedBehaviors.OnDoubleClick"
               Value="{Binding Recall}" />
   </Style>
</dg:DataGrid.RowStyle>