IsFocused Trigger

[Corrado Cavalli]

Today's probably not my day... J

I just want to define a trigger that changes a listbox background color when
focused:

<Style x:Key="ListBoxStyle1" TargetType="{x:Type ListBox}">

<Style.Triggers>

<Trigger
Property="IsFocused" Value="True">

<Setter Property="Background" Value="#FFDFD331"/>

</Trigger>

</Style.Triggers>

<Setter Property="Background"
Value="#FFA2D27F"/>

</Style>

<ListBox x:Name="lb1" HorizontalAlignment="Left"
GotFocus="ListBox_GotFocus" Margin="14,19,0,36" Width="114"
Style="{DynamicResource ListBoxStyle1}" >

</ListBox>

Investigating the code I've seen that, inside Listbox's GotFocus event
IsFocused is still false, doing the same with a Textbox I get True, any idea
about the reason of this difference?

-Corrado

[Corrado Cavalli]

[Tamir Khason]

It because ListBoxItem is Focused, rather then ListBox itself

--
Tamir http://khason.net/

[Eric Burke]

Does the ListBox have items? If so, it's might be focused on one of its children.

From the docs for UIElement.GotFocus:

"Because this event uses bubbling routing, the element that receives focus
might be a child element instead of the element where the event handler is
actually attached. Check the Source in the event data to
determine the actual element that gained focus"

[Josh Smith]

The Trigger's Property should point to IsKeyboardFocusWithin, not IsFocused.

Josh

[Corrado Cavalli]

That's what I presumed, but so, what's the quickest way to change listbox's
background color using XAML?

-----Original Message-----
From: wpf-di...@googlegroups.com [mailto:wpf-di...@googlegroups.com]
On Behalf Of Tamir Khason
Sent: mercoledì 21 gennaio 2009 12:08
To: wpf-di...@googlegroups.com
Subject: [WPF Disciples] Re: IsFocused Trigger

It because ListBoxItem is Focused, rather then ListBox itself

On Wed, Jan 21, 2009 at 12:29 PM, Corrado Cavalli
<corrado...@gmail.com> wrote:

--
Tamir http://khason.net/

[Corrado Cavalli]

Absolutely right Josh!

As I’ve said, today’s not my day…

 

-Corrado

 

From: wpf-di...@googlegroups.com [mailto:wpf-di...@googlegroups.com] On Behalf Of Josh Smith
Sent: mercoledì 21 gennaio 2009 12:46
To: wpf-di...@googlegroups.com
Subject: [WPF Disciples] Re: IsFocused Trigger

 

The Trigger's Property should point to IsKeyboardFocusWithin, not IsFocused.

Josh

On Wed, Jan 21, 2009 at 5:29 AM, Corrado Cavalli <corrado...@gmail.com> wrote:

[Eric Burke]

Does your application have a Menu Bar or Tool Bar (or any custom Focus Scopes)?  If so, if you use the IsKeyboardFocusWithin, you might see some odd behavior when you click a menu item or toolbar button because of the way WPF handles logical vs. keyboard focus.  [e.g., when the user clicks a toolbar button, which receives the keyboard focus, you might see your ListBox flash back to its unfocused color.  I haven't tried this with your example, but I have run into issues with triggers and focus scopes in the past.]

There's no single property that I know of that can tell you whether logical focus is in your tree or not (e.g., IsLogicalFocusWithin).  You probably would have to write a little helper class which has an attached property called IsLogicalFocusWithin which does the work for you.

---

From: Josh Smith <flappl...@gmail.com>
To: wpf-di...@googlegroups.com
Sent: Wednesday, January 21, 2009 6:46:07 AM

Subject: [WPF Disciples] Re: IsFocused Trigger

[Corrado Cavalli]

Well,

Mine was indeed a test created for another issue.

What about using an event trigger tied to Focused Event like Silverlight does?

 

                               <Style x:Key="ListBoxStyle1" TargetType="{x:Type ListBox}">

                                               <Style.Resources>

                                                               <Storyboard x:Key="OnGotFocus1">

                                                                              <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="{x:Null}" Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)">

                                                                                              <SplineColorKeyFrame KeyTime="00:00:00" Value="#FF4FDA24"/>

                                                                              </ColorAnimationUsingKeyFrames>

                                                               </Storyboard>

                                               </Style.Resources>

                                               <Style.Triggers>

                                                               <EventTrigger RoutedEvent="FocusManager.GotFocus">

                                                                              <BeginStoryboard Storyboard="{StaticResource OnGotFocus1}"/>

                                                               </EventTrigger>

                                               </Style.Triggers>

                               </Style>

 

From: wpf-di...@googlegroups.com [mailto:wpf-di...@googlegroups.com] On Behalf Of Eric Burke
Sent: mercoledì 21 gennaio 2009 13:13
To: wpf-di...@googlegroups.com
Subject: [WPF Disciples] Re: IsFocused Trigger

 

Does your application have a Menu Bar or Tool Bar (or any custom Focus Scopes)?  If so, if you use the IsKeyboardFocusWithin, you might see some odd behavior when you click a menu item or toolbar button because of the way WPF handles logical vs. keyboard focus.  [e.g., when the user clicks a toolbar button, which receives the keyboard focus, you might see your ListBox flash back to its unfocused color.  I haven't tried this with your example, but I have run into issues with triggers and focus scopes in the past.]

There's no single property that I know of that can tell you whether logical focus is in your tree or not (e.g., IsLogicalFocusWithin).  You probably would have to write a little helper class which has an attached property called IsLogicalFocusWithin which does the work for you.

From: Josh Smith <flappl...@gmail.com>
To: wpf-di...@googlegroups.com
Sent: Wednesday, January 21, 2009 6:46:07 AM
Subject: [WPF Disciples] Re: IsFocused Trigger