WPF - Connect EventSetter to an ICommand-CodePudding

I'm looking for a solution where I double click on a DataGridRow that calls a method in my ViewModel with an ICommand.

I have this code for my DataGrid's DataGridRow style:

<DataGrid.Resources>
    <Style TargetType="{x:Type DataGridRow}">
        <EventSetter Event="MouseDoubleClick"
                     Handler="DataGridRow_MouseDoubleClick" />
    </Style>
</DataGrid.Resources>

This works, but...
I need to have the method DataGridRow_MouseDoubleClick in the XAML's code-behind. Then in that method I need to call the method in my ViewModel.
I would like to bypass the code-behind and directly call the method in the ViewModel with an ICommand.

I found this code which was elegant but, calls the method whereever I (left) double click on the DataGrid.

<DataGrid>
    <DataGrid.InputBindings>
        <MouseBinding Gesture="LeftDoubleClick"
                      Command="{Binding MyCallback}" />
    </DataGrid.InputBindings>-->
</DataGrid>

I can only allow double click on a DataGridRow.

Any suggestions?

/BR
Steffe

CodePudding user response：

You could replace the event handler with an attached behaviour that executes the command:

public static class DataGridRowExtensions
{
    public static readonly DependencyProperty MouseDoubleClickCommandProperty =
        DependencyProperty.RegisterAttached(
            "MouseDoubleClickCommand",
            typeof(ICommand),
            typeof(DataGridRowExtensions),
            new FrameworkPropertyMetadata(default(ICommand), new PropertyChangedCallback(OnSet))
    );

    public static ICommand GetMouseDoubleClickCommand(DataGridRow target) =>
        (ICommand)target.GetValue(MouseDoubleClickCommandProperty);

    public static void SetHasFish(DataGridRow target, ICommand value) =>
        target.SetValue(MouseDoubleClickCommandProperty, value);

    private static void OnSet(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        DataGridRow row = (DataGridRow)d;
        row.MouseDoubleClick  = Row_MouseDoubleClick;
    }

    private static void Row_MouseDoubleClick(object sender, MouseButtonEventArgs e)
    {
        DataGridRow row = (DataGridRow)sender;
        ICommand command = GetMouseDoubleClickCommand(row);
        if (command != null)
            command.Execute(default);
    }
}

XAML:

<Style TargetType="{x:Type DataGridRow}">
    <Setter Property="local:DataGridRowExtensions.MouseDoubleClickCommand"
            Value="{Binding DataContext.MyCallback,
                RelativeSource={RelativeSource AncestorType=DataGrid}}" />
</Style>

CodePudding user response：

First, install the Nuget package mentioned below in your project.

Microsoft.Xaml.Behaviors.Wpf

Then add the following reference to the relevant xaml field.

xmlns:i="http://schemas.microsoft.com/xaml/behaviors"

As the next step, you can apply the double click function as follows.

<i:Interaction.Triggers>
     <i:EventTrigger EventName="MouseDoubleClick">
          <i:InvokeCommandAction Command="{Binding MyCallback}"/>
     </i:EventTrigger>
</i:Interaction.Triggers>