using System.Windows;
using System.Windows.Controls;
using Microsoft.Xaml.Behaviors;

namespace DTS.Common.Behaviors
{

    public class TrimTextBoxBehavior : Behavior<TextBox>
    {
        protected override void OnAttached()
        {
            base.OnAttached();

            AssociatedObject.LostFocus += AssociatedObject_LostFocus;

        }

        private void AssociatedObject_LostFocus(object sender, RoutedEventArgs e)
        {
            var trim = AssociatedObject.Text.Trim();
            if (trim != AssociatedObject.Text)
            {
                AssociatedObject.Text = trim;
                AssociatedObject.GetBindingExpression(TextBox.TextProperty).UpdateSource();
            }
        }

        protected override void OnDetaching()
        {
            base.OnDetaching();

            AssociatedObject.LostFocus -= AssociatedObject_LostFocus;
        }
    }

}