WPF - Remove focus when clicking outside of a textbox

Question

I have some textboxes where I would like focus to behave a little differently than normal for a WPF application. Basically, I would like them to behave more like a textbox b

Answer 1

you cant explicitly loose the focus of a control

you can set the focus to other control instead

**txt.Focusable=true;
label.focus();
Keyboard.Focus(txtPassword);**

try this

Answer 2

I was running into a similar issue, but when I wrapped a ScrollViewer control around my textboxes , all the textboxes would automatically lose focus when clicking anywhere outside the texboxes.

Answer 3

I think, better way to solve this problem is adding MouseDown event handler to window with code behind:

private void window_MouseDown(object sender, MouseButtonEventArgs e)
{
    Keyboard.ClearFocus();
}

Answer 4

I'm not 100% sure, but if you set Focusable to true on the container element (Grid, StackPanel, etc) then it should take the focus away from the text box.

Answer 5

You can use the IsKeyboardFocusedChanged event:

myTextBox.IsKeyboardFocusedChanged += myTextBox_IsKeyboardFocusedChanged;

private void SendFileCaptionTextBox_IsKeyboardFocusedChanged(object sender, DependencyPropertyChangedEventArgs e)
{
    if (e.NewValue.ToString() == "True")
    {
        // it's focused
    }
    else
    {
        // it's not focused
    }
}    

Answer 6

You can register the PreviewMouseLeftButtonDownEvent to every type of element in App.xaml.cs on application startup.

EventManager.RegisterClassHandler(typeof(UIElement), UIElement.PreviewMouseLeftButtonDownEvent,
                new MouseButtonEventHandler(FocusElement));

private void FocusElement(object sender, MouseButtonEventArgs e)
{
     var parent = e.OriginalSource as DependencyObject;
     if (parent is UIElement element && !element.Focusable)
     {
         element.Focusable = true;
         element.Focus();
         element.Focusable = false;
     }
}