从画布中的其他UserControl将焦点设置到TextBox？

Question

I am using a Canvas inside a Window, to make it like a MDI Application.

The canvas will hold multiple UserControls which are Child Windows.

I am able to open a new UserControl inside the Canvas on the GotFocus event of some textbox.

But When I Click Enter or closes the new Window, I want to set the focus back to the old UserControl's next TextBox? Which I am not able to achieve.

I am using WPF with Caliburn Micro? Currently using EventAggreagator to open the new UserControl on GotFocus event of TextBox.

Answer 1

I recently did something similar and the only thing I could come up with was to use the IEventAggregator to publish a notification that a UserControl had closed, ie,

public class ControlClosedEvent
{
    public ControlClosedEvent()
    {
        // can be an empty event for all intents and purposes
    }
} 

Whenever a UserControl closes, publish the event:

 _events.Publish( new ControlClosedEvent() );

And the consumers:

public partial class SomeView : UserControl, IHandle<ControlClosedEvent>
{
    public void Handle( ControlClosedEvent message )
    {
        // ugly way of setting the text box as focused
        SomeTextBox.Focus();
    }
}