Programming with .NET - General

Re: Binding.UpdateSourceTrigger

Zoltan Arvai — Thu, 23 Jul 2009 09:12:20 GMT

I have created a workaround using behaviors. Here is the blogpost, and you can download the code as well:

Binding update on TextBox.TextChanged event using Behaviors

Re: Binding.UpdateSourceTrigger

Thomas Claudius Huber — Fri, 17 Jul 2009 12:11:18 GMT

There's also another solution than using the focus trick. Try it via updating the BindingSource directly:

http://www.thomasclaudiushuber.com/blog/2009/07/17/here-it-is-the-updatesourcetrigger-for-propertychanged-in-silverlight/

Re: Binding.UpdateSourceTrigger

RomainP — Thu, 19 Mar 2009 04:31:12 GMT

Thanks mchlsync!

This is a great way of automating the focus trick. I just have to do some research on how to set attached properties programmatically (my TextBox is created in the code), but it looks very promising!

Re: Binding.UpdateSourceTrigger

mchlSync — Wed, 04 Mar 2009 04:31:03 GMT

Hi Romain and Andy,

I just created one small sample for you guys. I make it works only for Textbox. You guys need to customize it based on your requirement.

UpdateSourceTriggerHelper - Attached Properties

public class UpdateSourceTriggerHelper
    {
        public static readonly DependencyProperty UpdateSourceTriggerProperty =
            DependencyProperty.RegisterAttached("UpdateSourceTrigger", typeof(bool), typeof(UpdateSourceTriggerHelper),
                                                new PropertyMetadata(OnUpdateSourceTriggerChanged));

        public static bool GetUpdateSourceTrigger(DependencyObject d)
        {
            return (bool)d.GetValue(UpdateSourceTriggerProperty);
        }

        public static void SetUpdateSourceTrigger(DependencyObject d, bool value)
        {
            d.SetValue(UpdateSourceTriggerProperty, value);
        }

        private static void OnUpdateSourceTriggerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            TextBox textBox = d as TextBox;
            if ((bool)e.OldValue)
            {
                textBox.TextChanged -= (s, arg) => {

                 };
            }
            if ((bool)e.NewValue)
            {
                textBox.TextChanged += (s, arg) => {
                    var c = findFocusableControl(textBox);
                    if (c != null)
                    {
                        c.Focus();
                    }
                    textBox.Focus();
                 };
            }
        }

        private static Control findFocusableControl(Control control)
        {
           var ctl = VisualTreeHelper.GetParent(control);
           if ((ctl as Control) != null)
           {
               return ctl as Control;
           }
           else
           {
               int childrenCount = VisualTreeHelper.GetChildrenCount(ctl);
               for (int i = 0; i < childrenCount; i++)
               {
                   var c = VisualTreeHelper.GetChild(ctl, i) as Control;
                   if ((c != null) && (c != control))
                   {
                       return c;
                   }
               }
           }
           return null;
        }
    }

Usage :

Re: Binding.UpdateSourceTrigger

RomainP — Wed, 04 Mar 2009 03:41:45 GMT

Hi,

I'd be very interested in knowing how you did this. Would you mind posting the code to your extension, or telling us how you faked the UpdateSourceTrigger?

Thanks,

Romain

Re: Binding.UpdateSourceTrigger

andyboyne — Mon, 30 Jun 2008 16:21:13 GMT

How did you achieve this?

Thanks,

Andy

Re: Binding.UpdateSourceTrigger

Marco Buerckel — Thu, 13 Mar 2008 20:00:50 GMT

Nevermind, just built an extension that does the job. Anyway, it would be great to see that feature within the next beta...

Regards
Marco Buerckel

Binding.UpdateSourceTrigger

Marco Buerckel — Thu, 13 Mar 2008 19:50:52 GMT

what about Binding.UpdateSourceTrigger? It seems like controls can only bind when they lose their focus. WPF allows also binding in realtime (UpdateSourceTrigger=PropertyChange). Is this possible with Silverlight?

Regards
Marco Buerckel