How to execute an action on value change

[kkharji]

Hello, so I have a setting page that has theme option. I'd like to execute an action if the value got changed. I could store the value in local variable and check if it's changed but I wonder if there is an api for that.

My code

ComboBox::from_id_source("theme")
                .width(125.)
                .selected_text(self.state.mode.as_ref())
                .show_ui(ui, |ui| {
                    for option in Mode::iter().collect::<Vec<_>>() {
                        ui.selectable_value(&mut self.state.mode, option, option.as_ref());

                    }
                });

[coderedart]

you can simply check that the value in self.state.mode has changed before and after running the UI code.
also ui.selectable_value() returns a Response which has a .changed() method which will return true if the value changed.

[kkharji]

😍 thanks @coderedart

Mode::iter().for_each(|o| {
    ui.selectable_value(&mut self.state.mode, o, o.as_ref())
        .changed()
        .then(|| self.configure_styles(ui.ctx(), false));
});