CODEWITHSUNDEEP
c#silverlightcontrolstextboxfocus
Dov
Dov

Reputation: 16166

Detecting a control's focus in Silverlight

Is there any way to tell whether a control (specifically a System.Windows.Controls.TextBox) is focused in Silverlight? I'm looking for something like the following (what you would see in a regular .Net application):

textBox.Focused

This seems like something simple and trivial to leave out from a control, and yet I can't find an answer anywhere.

Update

A slightly more elegant solution, incorporating Rob's answer, is to create an extension method like so:

public static bool IsFocused( this Control control )
{
    return FocusManager.GetFocusedElement() == control;
}

Upvotes: 16

Views: 8826

Answers (2)

Martin
Martin

Reputation: 6146

As soon as you have a control consisting of more than one input element (which needs to have focus for handling user input) asking the FocusManager won't do the trick anymore. Try this:

private bool HasFocus { get; set; }

protected override void OnGotFocus( RoutedEventArgs e )
{
    base.OnGotFocus( e );
    HasFocus = true;
}

protected override void OnLostFocus( RoutedEventArgs e )
{
    base.OnLostFocus( e );
    HasFocus = false;
}

Upvotes: 0

Rob Fonseca-Ensor
Rob Fonseca-Ensor

Reputation: 15621

You have to use FocusManager

bool b = FocusManager.GetFocusedElement() == textBox;

Upvotes: 27

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