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: button_row.rs
    path of file: ./repos/cacao/examples/calculator
    
    the code of the file until where you have to start completion: use cacao::button::Button;
use cacao::color::Color;
use cacao::layout::{Layout, LayoutConstraint};
use cacao::view::View;

use crate::calculator::Msg;
use crate::content_view::{button, BUTTON_HEIGHT, BUTTON_WIDTH};

pub struct ButtonRow {
    pub view: View,
    pub buttons: Vec<Button>
}

impl ButtonRow {
    pub fn new(x: [Msg; 4], color: Color, action_color: Color) -> Self {
        let view = View::new();

        let buttons: Vec<Button> = x
            .iter()
            .map(|y| {
                let button = button(
                    match y {
                        Msg::Clear => "C",
                        Msg::Add => "+",
                        Msg::Subtract => "-",
                        Msg::Multiply => "X",
                        Msg::Divide => "/",
                        Msg::Invert => "+/-",
                        Msg::Mod => "%",
                        Msg::Push(i) if *i == 1 => "1",
                        Msg::Push(i) if *i == 2 => "2",
                        Msg::Push(i) if *i == 3 => "3",
                        Msg::Push(i) if *i == 4 => "4",
                        Msg::Push(i) if *i == 5 => "5",
                        Msg::Push(i) if *i == 6 => "6",
                        Msg::Push(i) if *i == 7 => "7",
                        Msg::Push(i) if *i == 8 => "8",
                        Msg::Push(i) if *i == 9 => "9",
                        _ => "W"
                    },
                    y.clone()
                );

                view.add_subview(&button);
                button
            })
            .collect();

        buttons[0].set_background_color(color.clone());
        buttons[1].set_background_color(color.clone());
        buttons[2].set_background_color(color);
        buttons[3].set_background_color(action_color);

        let width = &buttons[0].width;

        LayoutConstraint::activate(&[
    
    
    pub fn new(x: [Msg; 4], color: Color, action_color: Color) -> Self {
        let view = View::new();

        let buttons: Vec<Button> = x
            .iter()
            .map(|y| {
                let button = button(
                    match y {
                        Msg::Clear => "C",
                        Msg::Add => "+",
                        Msg::Subtract => "-",
                        Msg::Multiply => "X",
                        Msg::Divide => "/",
                        Msg::Invert => "+/-",
                        Msg::Mod => "%",
                        Msg::Push(i) if *i == 1 => "1",
                        Msg::Push(i) if *i == 2 => "2",
                        Msg::Push(i) if *i == 3 => "3",
                        Msg::Push(i) if *i == 4 => "4",
                        Msg::Push(i) if *i == 5 => "5",
                        Msg::Push(i) if *i == 6 => "6",
                        Msg::Push(i) if *i == 7 => "7",
                        Msg::Push(i) if *i == 8 => "8",
                        Msg::Push(i) if *i == 9 => "9",
                        _ => "W"
                    },
                    y.clone()
                );

                view.add_subview(&button);
                button
            })
            .collect();

        buttons[0].set_background_color(color.clone());
        buttons[1].set_background_color(color.clone());
        buttons[2].set_background_color(color);
        buttons[3].set_background_color(action_color);

        let width = &buttons[0].width;

        LayoutConstraint::activate(&[
            buttons[0].top.constraint_equal_to(&view.top),
            buttons[0].leading.constraint_equal_to(&view.leading),
            buttons[0].bottom.constraint_equal_to(&view.bottom),
            width.constraint_equal_to_constant(BUTTON_WIDTH),
            buttons[1].top.constraint_equal_to(&view.top),
            buttons[1].leading.constraint_equal_to(&buttons[0].trailing).offset(1.),
            buttons[1].bottom.constraint_equal_to(&view.bottom),
            buttons[1].width.constraint_equal_to(&width),
            buttons[2].top.constraint_equal_to(&view.top),
            buttons[2].leading.constraint_equal_to(&buttons[1].trailing).offset(1.),
            buttons[2].bottom.constraint_equal_to(&view.bottom),
            buttons[2].width.constraint_equal_to(&width),
            buttons[3].top.constraint_equal_to(&view.top),
            buttons[3].leading.constraint_equal_to(&buttons[2].trailing).offset(1.),
            buttons[3].trailing.constraint_equal_to(&view.trailing),
            buttons[3].bottom.constraint_equal_to(&view.bottom),
            buttons[3].width.constraint_equal_to(&width),
            view.height.constraint_equal_to_constant(BUTTON_HEIGHT)
        ]);

        Self { view, buttons }
    }