FocusBehavior Class

Focuses a UI control without code-behind.

Assembly: DevExpress.WinUI.Core.v22.1.dll

Declaration

C#
VB.NET

public class FocusBehavior :
    EventTrigger<Control>

Public Class FocusBehavior
    Inherits EventTrigger(Of Control)

Remarks

Run Demo: Behaviors Module in the WinUI MVVM Demo

Focus a Control Once it is Loaded

In the following code sample, the FocusBehavior focuses a TextBox control when the control is loaded:

XAML

<UserControl ...
    xmlns:dx="using:DevExpress.WinUI.Core">
    <TextBox Text="This control is focused on startup">
        <dx:Interaction.Behaviors>
            <dx:FocusBehavior/>
        </dx:Interaction.Behaviors>
    </TextBox>
</UserControl>

Focus a Control When an Event is Raised

Set the EventOwner property to specify an object that raises the event you want to track.
Specify an object’s event in the EventName property.

The following code sample focuses the TextBox control when a user clicks a Button:

XAML

<UserControl ...
    xmlns:dx="using:DevExpress.WinUI.Core">
    <StackPanel>
        <TextBox Text="This control is focused on button click: ">
            <dx:Interaction.Behaviors>
                <dx:FocusBehavior EventOwner="{x:Bind button}" EventName="Tapped"/>
            </dx:Interaction.Behaviors>
        </TextBox>
        <Button x:Name="button" Content="Click to focus the TextBox"/>
    </StackPanel>
</UserControl>

Focus With a Delay

You can specify a FocusDelay regardless of what triggers the FocusBehavior:

XAML

<UserControl ...
    xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm">
    <StackPanel>
        <TextBox Text="This control is focused with a delay">
            <dxmvvm:Interaction.Behaviors>
                <dxmvvm:FocusBehavior SourceName="btn" EventName="Click" FocusDelay="0:00:01"/>
            </dxmvvm:Interaction.Behaviors>
        </TextBox>
        <Button x:Name="btn" Content="Click to focus the TextBox"/>
    </StackPanel>
</UserControl>