Programming with .NET - General

Re: Re: Re: Re: Silverlight 2.0 Textbox focus issue

GearWorld — Thu, 17 Sep 2009 10:47:25 GMT

Thanx to whom ?
What works ?

Re: Re: Re: Silverlight 2.0 Textbox focus issue

lonelyprince — Tue, 15 Sep 2009 05:26:20 GMT

thanks, it works

Re: Re: Silverlight 2.0 Textbox focus issue

GearWorld — Thu, 03 Sep 2009 22:53:04 GMT

That's right DNA :)

Re: Re: Silverlight 2.0 Textbox focus issue

MisinformedDNA — Thu, 03 Sep 2009 17:16:22 GMT

My code above shows exactly what I am doing, except I swapped the two lines. Of course this is the main page, there is still the frame that has to load.

According to you, you are getting an invisible cursor at times. That tells me that you don't have the final solution yet either.

Re: Re: Silverlight 2.0 Textbox focus issue

GearWorld — Thu, 03 Sep 2009 09:45:51 GMT

MisinformedDNA:

I thought the invisibleness was being caused by the VisualState. How do I know if VisualState is the last thing going on in the UI thread? The GoToState call is happening when the MainPage's Loaded event is called.

Is it the very last thing you do in your Loaded event ?
Any Call back after ?

It must be the very last line of code you do in the Loaded event.

Re: Re: Silverlight 2.0 Textbox focus issue

MisinformedDNA — Wed, 02 Sep 2009 20:57:28 GMT

Clarification: Focus works 100% of the time, but an invisible cursor is a big problem.

I'm actually using an AutoCompleteBox, so when a user types a letter and the autocomplete comes up, it's impossible to tell which characters I types and which characters are part of the auto complete.

I thought the invisibleness was being caused by the VisualState. How do I know if VisualState is the last thing going on in the UI thread? The GoToState call is happening when the MainPage's Loaded event is called.

Re: Re: Silverlight 2.0 Textbox focus issue

GearWorld — Wed, 02 Sep 2009 18:51:50 GMT

Are you sure your VisualState is the last thing going on by the UI Thread ?
IF so, I can tell you that mine works 99% fine the 1% it's the cursor seems invisible but the focus is in the textbox at least.

Oh I just thing about something, Maybe the Easying is making just a bit more after the storyboard and this is why my cursor vanishes
sometimes. Not all the time.

but this is the only thing not going well. The focus always work tought
Make sure also you use the TextBox.Focus. Not only the htmlPage.Pluing.Focus();

Re: Re: Silverlight 2.0 Textbox focus issue

MisinformedDNA — Wed, 02 Sep 2009 15:41:44 GMT

GearBox, have you gotten it to work 100% of the time?

I have the following XAML in MainPage.xaml in the Grid element

<VisualStateManager.VisualStateGroups>
	<VisualStateGroup x:Name="Startup">
		<VisualState x:Name="Intro">
			<Storyboard Completed="Intro_Completed"/>
		</VisualState>
	</VisualStateGroup>
</VisualStateManager.VisualStateGroups>

In MainPage.xaml.cs

this.Loaded += (s, e) =>
{
    VisualStateManager.GoToState(this, "Intro", true);
    HtmlPage.Plugin.Focus();
};

It's still not working 100% of the time. Better, but not fixed yet. Do I need something else?

Re: Re: Silverlight 2.0 Textbox focus issue

mepfuso — Wed, 02 Sep 2009 14:40:47 GMT

Setting controls' focus on Microsoft platform has always been a problem, I dunno why. It works a lot easier on other platforms. ;-) ... Also the solutions presented here are obviously mere hacks. The render engine must handle this internally. It must save every call to any .Focus() method of the visual tree in a field, and then, after layouting and other heavy UI work is done, execute the actual focussing for the control that was the last one requesting the focus.

Re: Re: Silverlight 2.0 Textbox focus issue

GearWorld — Wed, 02 Sep 2009 14:23:57 GMT

This thread : http://silverlight.net/forums/t/122682.aspx helps solve the Focus problem after a VisualState
The idea is to set the Completed Event to the VisualState StoryBoard and in the completed event you wire up you put the focus there.

Because all the focus problems are always related to the UI thread doing something and until it isn't finished, focusing is useless.
Focusing will walways work if you're at the VERY END of anything the UI thread is working on.

Re: Re: Silverlight 2.0 Textbox focus issue

MisinformedDNA — Mon, 31 Aug 2009 17:39:40 GMT

I combined what I read above into the following:

I put the first line below in my constructor. The purpose of the multiple Dispatcher calls is to delay the focus from happening right away and interfering with the VisualState (as suggested by GearBox).

The "InitialFocus.Focus()" call represents a call to a Collapsed TextBox and then I switch to the real TextBox that I want focus.

this.Loaded += (s, e) => Dispatcher.BeginInvoke(() => Dispatcher.BeginInvoke(GetFocus));

private void GetFocus()
{
    HtmlPage.Plugin.Focus();
    InitialFocus.Focus();
    SearchBox.Focus();
}

This seems to work 100% of the time for me and is the best thing I've found so far. Thanks for all your help.

Re: Re: Silverlight 2.0 Textbox focus issue

GearWorld — Sun, 23 Aug 2009 11:55:47 GMT

This problem is hard to pin point. Sometimes it works sometimes not. Here's a scenario where I'm unable to focus on the TextBox

VisualStateManager.GoToState(this, "OpenAdminPanel", true);
System.Windows.Browser.HtmlPage.Plugin.Focus(); // This didn't help either.....
pbCode.Focus(); // This doesn't focus on the PasswordBox...

Seems that when there's a VisualState in progress at the same time we're trying to focus, it doesn't work.
I've been looking for an event to tell me when the visual state is completed but I didn't find any
Seems that focusing on a control works only when Everything else is completed. VERY COMPLETED otherwise
Focusing is useless.

Re: Re: Silverlight 2.0 Textbox focus issue

slavag — Thu, 30 Jul 2009 22:19:39 GMT

Try to change TabIndex:

PasswordTextBox.TabIndex = 0;

UserNameTextBox.TabIndex = 1;

this.UpdateLayout();

PasswordTextBox.Focus();

Re: Re: Silverlight 2.0 Textbox focus issue

hwsoderlund — Mon, 04 May 2009 11:48:05 GMT

Try this, see if it works.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Threading;
using System.Windows.Browser;
 
namespace SilverlightApplication20
{
    public partial class Page4 : UserControl
    {
        public Page4()
        {
            InitializeComponent();
 
            Dispatcher.BeginInvoke(DoFocus);
        }
 
        private void DoFocus()
        {
            HtmlPage.Plugin.Invoke("focus");
            MyTextBox.Focus();
        }
    }
}

Re: Re: Silverlight 2.0 Textbox focus issue

Thomas D — Mon, 04 May 2009 09:43:32 GMT

mepfuso:
Servus nach Österreich aus Bayern :-) ... do you try to do that in the constructor, i.e. directly after InitializeComponent()? Maybe focus only works reliably in the Loaded event.

Grüße zurück ... I've tried to put HtmlPage.Plugin.Focus(); just after InitializeComponent(), but this didn't helped either. I can't set focus to the TextBox directly after loading as it is created at runtime and it's visibility changes multiple times during interaction with the program (focus should be applied, when the component's visibility is set to visible). So that didn't solve the issue unfortunately ...