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Mouse Event Commands for MVVM

, 22 Jan 2013
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Use an Attached Property to execute an ICommand.

Introduction

If you ever want to pass MouseEventArgs to a ViewModel, here's a neat way to do it Smile | <img src=

The Attached Property 

public class MouseBehaviour
{
    public static readonly DependencyProperty MouseUpCommandProperty =
        DependencyProperty.RegisterAttached("MouseUpCommand", typeof(ICommand), 
        typeof(MouseBehaviour), new FrameworkPropertyMetadata(
        new PropertyChangedCallback(MouseUpCommandChanged)));

    private static void MouseUpCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        FrameworkElement element = (FrameworkElement)d;

        element.MouseUp += new MouseButtonEventHandler(element_MouseUp);
    }

    static void element_MouseUp(object sender, MouseButtonEventArgs e)
    {
        FrameworkElement element = (FrameworkElement)sender;

        ICommand command = GetMouseUpCommand(element);

        command.Execute(e);
    }

    public static void SetMouseUpCommand(UIElement element, ICommand value)
    {
        element.SetValue(MouseUpCommandProperty, value);
    }

    public static ICommand GetMouseUpCommand(UIElement element)
    {
        return (ICommand) element.GetValue(MouseUpCommandProperty);
    }
}

We simply register the attached property, hook the MouseUp event for the FrameworkElement, and invoke the Command in the handler. Simple enough, right? 

Usage 

<Image Source="c:/temp.png" [Your xmlns]:MouseBehaviour.MouseUpCommand="{Binding MouseUpCommand}"></Image>

You do not, of course, have to use an <Image>, any framework element will work just fine. That's the beauty of Attached Properties! 

Having trouble attaching source, which contains Attached Properties for handling any mouse event MVVM style. But when it's up, includes 

  • MouseUp
  • MouseDown
  • MouseEnter
  • MouseLeave
  • MouseLeftButtonDown
  • MouseLeftButtonUp
  • MouseMove
  • MouseRightButtonDown
  • MouseRightButtonUp
  • MouseWheel

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Matthew Searles
Software Developer Lovatts Publications
Australia Australia
No Biography provided

Comments and Discussions

 
Questionmissing png images? Pinmembersbarnes2-Apr-14 23:01 
AnswerRe: missing png images? Pinmembersbarnes2-Apr-14 23:07 
AnswerRe: missing png images? PinmemberMatt Searles3-May-14 23:32 
Questionproject is not compiled PinmemberMember 1019491420-Mar-14 20:02 
GeneralMy vote of 5 PinmemberWolfgang Polzleitner11-Mar-14 8:50 
GeneralRe: My vote of 5 PinmemberMatt Searles11-Mar-14 15:00 
QuestionBubbled events prevent this from working PinmemberRickB_AZ1-Jan-14 5:32 
AnswerRe: Bubbled events prevent this from working Pinmemberselfwalker27-Mar-14 16:39 
SuggestionGarbage Collection? Pinmemberhaindl17-Oct-12 21:39 
GeneralRe: Garbage Collection? PinmemberDakko18-Oct-12 0:49 
GeneralRe: Garbage Collection? Pinmemberhaindl18-Oct-12 1:50 

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