You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/vizia/examples/views/helpers
    
    the code of the file until where you have to start completion: #![allow(dead_code)]
use vizia::prelude::*;

use log::LevelFilter;
use std::error::Error;

pub const CENTER_LAYOUT: &str = r#"
    .container {
        width: 1s;
        height: 1s;
        child-space: 1s;
        col-between: 20px;
        row-between: 20px;
    }
"#;

#[derive(Lens)]
pub struct ControlsData {
    pub disabled: bool,
    pub theme_options: Vec<&'static str>,
    pub selected_the
    
    fn event(&mut self, cx: &mut EventContext, event: &mut Event) {
        event.map(|app_event, _| match app_event {
            ControlsEvent::ToggleDisabled => {
                self.disabled ^= true;
            }
            ControlsEvent::SetThemeMode(theme_mode) => {
                self.selected_theme = *theme_mode;
                cx.emit(EnvironmentEvent::SetThemeMode(match theme_mode {
                    0 /* system */ => AppTheme::System,
                    1 /* Dark */ => AppTheme::BuiltIn(ThemeMode::DarkMode),
                    2 /* Light */ => AppTheme::BuiltIn(ThemeMode::LightMode),
                    _ => unreachable!(),
                }));
            }
        });
    }