How to get the any part of ui changed info?

[mikialex]

Consider any typical egui function like this:

  /// return any changed
  pub fn egui(&mut self, ui: &mut egui::Ui){
    ui.checkbox(&mut self.enable_taa, "enable taa");
    ui.checkbox(&mut self.enable_fxaa, "enable fxaa");
    ui.checkbox(&mut self.enable_ground, "enable ground");
    ui.checkbox(&mut self.enable_ssao, "enable ssao");

    ui.collapsing("outline", |ui| {
      ui.checkbox(&mut self.enable_outline, "enable outline");
      ui.checkbox(&mut self.show_outline_only, "show_outline_only");
      self.outline_color.mutate(|color| {
        modify_color4(ui, color);
      });
      modify_color(ui, &mut self.outline_background_color);
    });

    post_egui(ui, &self.post);
  }

How can I know if any state has been modified by ui?

I don't want to check every ui's response and or them together, it's too cumbersome.

I tried wrapping it with a scope and checking the scope's response.changed() but not work. It seems change info is pure local.