Textbox SelectAll on tab but not mouse click

Question

So lets say I have a WPF form with several text boxes, if you tab to the text box and it already has something in it, I want to select all the text in that box so typing wil

Answer 1

You could try checking if the Mouse is present in the TextBox when the Focus Event happens and check the Mouse ButtonButtonState. This is not perfect but should be close to what you are looking for.

private void EventSetter_OnHandler(object sender, RoutedEventArgs e)
{
    TextBox txt = sender as TextBox;
    Point position = Mouse.GetPosition(txt);
    // if Mouse position is not in the TextBox Client Rectangle
    // and Mouse Button not Pressed.
    if((!(new Rect(0,0,txt.Width,txt.Height)).Contains(position)) || ( Mouse.LeftButton != MouseButtonState.Pressed))
        if (txt != null) txt.SelectAll();
}

and as H.B. Pointed out you could try using the txt.IsMouseOver Property to determine if the Cursor is inside the TextBox's Client Rectangle. It looks a lot cleaner.

private void EventSetter_OnHandler(object sender, RoutedEventArgs e)
{
    TextBox txt = sender as TextBox;
    if( !txt.IsMouseOver || Mouse.LeftButton != MouseButtonState.Pressed)
        if (txt != null) txt.SelectAll();
}