Rust语言学习笔记（10）

OOP

// src/lib.rs
pub trait Draw {
    fn draw(&self);
}
pub struct Screen {
    pub components: Vec<Box<dyn Draw>>,
}
impl Screen {
    pub fn run(&self) {
        for component in self.components.iter() {
            component.draw();
        }
    }
}
pub struct Button {
    pub width: u32,
    pub height: u32,
    pub label: String,
}
impl Draw for Button {
    fn draw(&self) {
        // code to actually draw a button
    }
}

// src/main.rs
use gui::Draw;
use gui::{Screen, Button};
struct SelectBox {
    width: u32,
    height: u32,
    options: Vec<String>,
}
impl Draw for SelectBox {
    fn draw(&self) {
        // code to actually draw a select box
    }
}
fn main() {
    let screen = Screen {
        components: vec![
            Box::new(SelectBox {
                width: 75,
                height: 10,
                options: vec![
                    String::from("Yes"),
                    String::from("Maybe"),
                    String::from("No")
                ],
            }),
            Box::new(Button {
                width: 50,
                height: 10,
                label: String::from("OK"),
            }),
        ],
    };
    screen.run();
}