ICommand

[gionna]

For the time being, this is the approach used to obtain the mouse coordinates:

XAML

<interactivity:Interaction.Triggers>
        <interactivity:EventTrigger EventName="PreviewDragOver">
            <i:CallMethodAction MethodName="UIElement_OnPreviewDragOver" TargetObject="{Binding}" />
        </interactivity:EventTrigger>
</interactivity:Interaction.Triggers>

VM

public void UIElement_OnPreviewDragOver(object sender, DragEventArgs e)
{
    Point = e.GetPosition((TreeView)sender);
}

I don't like what I'm inside. VM I'm working with the counter, and I'd like to redo this processor. ICommand♪ But how do you get the mouse coordinates?

[tahishae]

Because the mouse coordinates aren't so easy to connect through XAML, it's easier to make a code-behind. Let your VM team lie in its own right. DragCommand♪

In XAML:

<Grid PreviewDragOver="OnPreviewDragOver" ...>

The code-behind has to do this:

We'll dependency property so we don't cast. DataContext type VM♪

public ICommand DragPreviewCommand
{
    get { return (ICommand)GetValue(DragPreviewCommandProperty); }
    set { SetValue(DragPreviewCommandProperty, value); }
}
public static readonly DependencyProperty DragPreviewCommandProperty =

DependencyProperty.Register("DragPreviewCommand", typeof(ICommand), typeof(MyWindow));

The designer shall be connected (in XAML, not possible):

public MyWindow()

{

InitializeComponent();

SetBinding(DragPreviewCommandProperty, "DragCommand");

}

And define the processor:

void OnPreviewDragOver(object sender, DragEventArgs e)

{

var senderUIElement = (UIElement)sender;

var mousePosition = e.GetPosition(senderUIElement);

var command = DragPreviewCommand;

if (command != null)

command.Execute(mousePosition);

}