GridView DoubleClick MVVM

[May]

Hi there,

In this link http://www.telerik.com/community/code-library/wpf/general/mvvm-context-amp-row-doubleclick-functionality.aspx, it is using the CommandBindingBehavior to bind the MouseDoubleClick event. The Problem is the the even fires when dbl clicking the header or scrollbar.

How can I make it fire when the actual row or cell is double clicked?

Thanks!

May

[Tsvyatko]

Hello May,

In order to fire the click event only when click is performed on a row the following code is needed:

private void RGV_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    e.Handled = ((FrameworkElement)e.OriginalSource).ParentOfType<GridViewRow>() == null;
}

I have attached sample project that demonstrates its usage. Please, let me know if this works for you.

Best wishes,
Tsvyatko
the Telerik team

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[May]

Hi Tsvyatko,

Thanks for the answer!

In the future, can a property added to cancel to handle the dbl click event if the OriginalSource is not GridViewRow. Since we use the GridView a lot, we have to wrap the GridView control to handle it. It would be nice have a property to set it.

Thanks again!

May

[Abolhassan]

Here's my solution for this:

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using Telerik.Windows.Controls;

namespace MyApp.Utility
{
    public sealed class RadGridViewRowDoubleClickHandler : FrameworkElement
    {
        public RadGridViewRowDoubleClickHandler(RadGridView gridView)
        {
            MouseButtonEventHandler handler = (sender, args) =>
            {
                var methodName = GetMethodName(gridView);

                var dataContextType = gridView.DataContext.GetType();
                var method = dataContextType.GetMethod(methodName);
                if (method == null)
                {
                    throw new MissingMethodException(methodName);
                }

                method.Invoke(gridView.DataContext, null);
            };

            gridView.RowLoaded += (s, e) =>
            {
                e.Row.MouseDoubleClick += handler;
            };

            gridView.RowUnloaded += (s, e) =>
            {
                e.Row.MouseDoubleClick -= handler;
            };
        }

        public static string GetMethodName(RadGridView gridView)
        {
            return (string)gridView.GetValue(MethodNameProperty);
        }

        public static void SetMethodName(RadGridView gridView, string value)
        {
            gridView.SetValue(MethodNameProperty, value);
        }

        public static readonly DependencyProperty MethodNameProperty = DependencyProperty.RegisterAttached(
            "MethodName",
            typeof(string),
            typeof(RadGridViewRowDoubleClickHandler),
            new PropertyMetadata((o, e) =>
            {
                var gridView = o as RadGridView;
                if (gridView != null)
                {
                    new RadGridViewRowDoubleClickHandler(gridView);
                }
            }));
    }
}

xmlns:local.Utility="clr-namespace:MyApp.Utility"


<telerik:RadGridView Grid.Row="1"
                             ItemsSource="{Binding Reports.ReportCollection}"
                             SelectedItem="{Binding SelectedReport, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                             local.Utility:RadGridViewRowDoubleClickHandler.MethodName="ShowReportDetails"> ...

"ShowReportDetails" is a public method in ViewModel which I get the SelectedItem(the row that was clicked) and show a DialogBox and display my report.

Hope it helps.

[Chris]

You a correct, you shouldn't cast to FrameworkElement.  Cast to DependencyObject.  If you double clicked something like a Run, that will fail the cast to FrameworkElement.

[Chris]

Ok I mistyped that somehow.  Here it is corrected:

Just a correction, you shouldn't cast to FrameworkElement.  Cast to DependencyObject.  If you double clicked something like a Run, that will fail the cast to FrameworkElement.