Function egui::containers::popup::show_tooltip_text

pub fn show_tooltip_text(ctx: &CtxRef, id: Id, text: impl ToString)

Show some text at the current pointer position (if any).

Most of the time it is easier to use Response::on_hover_text.

See also show_tooltip.

if ui.ui_contains_pointer() {
    egui::show_tooltip_text(ui.ctx(), egui::Id::new("my_tooltip"), "Helpful text");
}