toggle button focus

Question

I want to switch the focus of a button when I press a key so that the focus entered and exited
i made this and it does not work :

func _physics_process(delta):
    if Input.is_action_just_pressed("ui_accept"):
        $Button.grab_focus() = !$Button.grab_focus()

Answer 1

grab_focus() is just a function that sets the focus on the control it's called on. So, you can't set it to a boolean value as you're attempting to do.

To set the focus on $Button, you simply need to call $Button.grab_focus(). If you need to first see if $Button already has focus, you can call $Button.has_focus().

Answer 2

try this:

func _physics_process(delta):
    if Input.is_action_just_pressed("ui_accept"):
        if $Button.has_focus():
            $Button.release_focus()
        else:
            $Button.grab_focus()