WPF ItemsControl - how to know when the items finished loading, so that I can focus the first one?

Posted by Tomáš Kafka on Stack Overflow See other posts from Stack Overflow or by Tomáš Kafka
Published on 2010-03-22T12:39:40Z Indexed on 2010/03/22 12:41 UTC
Read the original article Hit count: 314

Filed under:

wpf

|

itemscontrol

|

focus

|

loaded

Hi everyone, I have an ItemsControl in my View, that is bound to an ObservableCollection from ViewModel. The collection is filled, and afterwards an event from VM to view is raised (think search results and SearchFinished event).

I would like to move keyboard focus to the first item in an ItemsControl, but when I do it in View's code-behind when handling SearchFinished, the items are not yet rendered (the collection is filled already, but wpf's rendering is asynchronous and didn't happen yet), so there is nothing to focus (Focus() needs to have the items' visual tree already constructed).

I wanted to do (myItemsControl.ItemContainerGenerator.ContainerFromIndex(0) as UIElement).Focus();, but as the 0th item is not yet loaded, ContainerFromIndex(0) returns null.

I tried delaying it with Dispatcher.BeginInvoke... with low priority, but that is dependent on exact timing and usually doesn't work.

How can I wait until the first item in ItemsControl is Loaded?

© Stack Overflow or respective owner

Related posts about wpf

C#/WPF - RoutedEvent in WPF class that isn't a UIElement

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a class that needs to notify that something significant has occured. The class is in a WPF-project, even though this specific class, is lookless (and doesn't inherit from UIElement, neither directly or indirectly). Normally, I just register a RoutedEvent to get this functionality but as this… >>> More
How to pass value from wpf form to wpf user control

as seen on Stack Overflow - Search for 'Stack Overflow'
Hai am having a WPF user control in my WPF Form, when i click my button in my form , i just want to pass some value to the textbox which is in the usercontrol, tell me how to do this. >>> More
WPF opening up exe program within WPF window

as seen on Stack Overflow - Search for 'Stack Overflow'
Not sure if this is possible but is there a way to open up another program like notepad within the container of a WPF window? similiar to that of being able to open a web page using the webbrowser control? Basically I would like to open notepad or other exe but keep it constrained within the WPF… >>> More
Silverlight Commands Hacks: Passing EventArgs as CommandParameter to DelegateCommand triggered by Ev

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Today I've tried to find a way how to pass EventArgs as CommandParameter to DelegateCommand triggered by EventTrigger. By reverse engineering of default InvokeCommandAction I find that blend team just ignores event args.To resolve this issue I have created my own action for triggering delegate commands… >>> More
Building applications with WPF, MVVM and Prism(aka CAG)

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
In this article I am going to walk through an application using WPF and Prism (aka composite application guidance, CAG) which simulates engaging a taxi (cab). The rules are simple, the app would have3 screens A login screen to authenticate the user An information screen. A screen… >>> More

Related posts about itemscontrol

When using ItemsControl ItemsControl.ItemsPanel is set to Canvas, ContenPresenter comes in and break

as seen on Stack Overflow - Search for 'Stack Overflow'
I am using an ItemsControl where the ItemsPanel is set to Canvas (see this question for more background information). The ItemsControl is performing as I want, and it works like a charm when adding a child element manually by putting it into ItemsControl.Items: <ItemsControl> <ItemsControl… >>> More
Silverlight ItemsControl vertical scrollbar, using a wrappanel as ControlTemplate

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a collection of elements, each one with a name and a subcollection of image blobs. I want to display an Accordion, with each item representing each of the MainElements. inside each element, I display the images in the subcollecion of said MainElement. The Accordion gets resized by the user… >>> More
ItemsControl.ItemsSource MVVM performance

as seen on Stack Overflow - Search for 'Stack Overflow'
I have an (non-virtualized) ItemsControl that binds its ItemsSource to a ObeservableCollection of ViewModel instances. Now once the large amount Model instances is loaded all the ViewModel complemnents needs to be added to that ObservableCollection. How can I add a large amount of ViewModels without… >>> More
ItemsControl.ItemsSource MVVM perormance

as seen on Stack Overflow - Search for 'Stack Overflow'
I have an (non-virtualized) ItemsControl that binds its ItemsSource to a ObeservableCollection of ViewModel instances. Now once the large amount Model instances is loaded all the ViewModel complemnents needs to be added to that ObservableCollection. How can I add a large amount of ViewModels without… >>> More
[WPF]ItemsControl not completely loaded @Loaded event

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi everyone I have a propably simple problem, that i just can't seem to figure out: I've made an ItemsControl which has its datacontext set and shows the data as pairs of Checkboxes and TextBlocs: <ItemsControl Name="listTaskTypes" Grid.Row="1" Grid.Column="2" Grid.RowSpan="2" ItemsSource="{Binding}"… >>> More