Function TextSelectionMenu 

pub fn TextSelectionMenu(
    __arg0: Point,
    __arg1: bool,
    on_copy: impl Fn() + 'static,
    on_cut: impl Fn() + 'static,
    on_paste: impl Fn() + 'static,
    on_select_all: impl Fn() + 'static,
)

A floating Copy / Cut / Paste / Select-all menu shown just above the text selection at anchor (window coordinates of the selection’s top-center).

can_paste hides the Paste item when the clipboard is empty. Each action runs against the focused field; the caller is expected to dismiss the menu.