Question

I have a Window shell that is basically:

<Window>
    <ContentPresenter Content="{Binding}" />
</Window>

Injected into the ContentPresenter at run-time are UserControls. What I want to be able to do is write:

<UserControl Window.Title="The title for my window">
[...]
</UserControl>

So that the Window title is updated using the UserControl Window.Title property.

I have a feeling this can be achieved using attached properties. Can anyone start me off in the right direction?

Daniel

Answer 1

C#:

public class MyUserControl : UserControl
{
   public static readonly DependencyProperty WindowTitleProperty = DependencyProperty.RegisterAttached("WindowTitleProperty",
                typeof(string), typeof(UserControl),
                new FrameworkPropertyMetadata(null, WindowTitlePropertyChanged));

        public static string GetWindowTitle(DependencyObject element)
        {
            return (string) element.GetValue(WindowTitleProperty);
        }

        public static void SetWindowTitle(DependencyObject element, string value)
        {
            element.SetValue(WindowTitleProperty, value);
        }

        private static void WindowTitlePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
                    Application.Current.MainWindow.Title = e.NewValue;
        }
}

XAML:

<UserControl namespace:MyUserControl.WindowTitle="The title for my window">
[...]
</UserControl>