視頻地址
頭條地址：https://www.ixigua.com/i6775861706447913485
源碼地址
github地址：見擴展鏈接。
講解內容
trait對象的例子：
(1) mkdir learn_oo2
(2)cd learn_oo2，編輯Cargo.toml
[workspace]
members = [
"gui",
"main",
]
(3) cargo new gui --lib
(4) 編輯gui/src/lib.rs源碼
```
pub trait Draw {
fn draw(&self);
}
pub struct Screen {
pub components: Vec
}
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) {
println!("draw button, width = {}, height = {}, label = {}",
self.width, self.height, self.label);
}
}
pub struct SelectBox {
pub width: u32,
pub height: u32,
pub options: Vec<string>,/<string>
}
impl Draw for SelectBox {
fn draw(&self) {
println!("draw selectBox, width = {}, height = {}, options = {:?}",
self.width, self.height, self.options);
}
}
////複習
//pub struct Screen
// pub components: Vec
//}
//
//impl
// where T: Draw {
// pub fn run(&self) {
// for component in self.components.iter() {
// component.draw();
// }
// }
//}
(5) cargo new main
(6) 編輯Cargo.toml文件，添加：
```
[dependencies]
gui = {path = "../gui"}
(7) 編輯src/main.rs源碼
use gui::{Screen, Button, SelectBox};
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"),
}),
],
};
//let screen = Screen {
// components: vec![
// SelectBox {
// width: 75,
// height: 10,
// options: vec![
// String::from("Yes"),
// String::from("Maybe"),
// String::from("No")
// ],
// },
// //Button {
// // width: 50,
// // height: 10,
// // label: String::from("OK"),
// //},
// ]
//};
screen.run();
}
```
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