如何从回调闭包中使用按钮本身?

How to use the button itself from the callback closure?

我已经从 gtk-rs 示例中编写了这段小代码,但是它无法编译,因为不能从闭包中使用按钮。

extern crate gtk;

use gtk::prelude::*;

fn main() {
    if gtk::init().is_err() {
        println!("Failed to initialize GTK.");
        return;
    }
    let window = gtk::Window::new(gtk::WindowType::Toplevel);
    let button = gtk::Button::new_from_stock("Click me !");

    window.add(&button);

    window.connect_delete_event(|_, _| {
        gtk::main_quit();
        Inhibit(false)
    });

    button.connect_clicked(move |_| {
        button.hide(); // error
    });

    window.show_all();
    gtk::main();
}

编译器写道:

src/main.rs:22:3: 22:9 error: cannot move `button` into closure because it is borrowed [E0504]
src/main.rs:22      button.hide();
                    ^~~~~~
src/main.rs:21:2: 21:8 note: borrow of `button` occurs here
src/main.rs:21  button.connect_clicked(move |_| {
            ^~~~~~

如何解决这个问题?

我不能通过引用传递变量:它是无效的,因为闭包的生命周期可能超过 main 的生命周期,编译器说。

注:我用这个Cargo.toml编译:

[package]
name = "test"
version = "0.1.0"
authors = ["Me"]

[features]
default = ["gtk/v3_16"]

[dependencies]
gtk = { git = "https://github.com/gtk-rs/gtk.git" }

下划线不代表"same name as outside the closure",它代表"make the closure argument unused/unusable"。尝试命名参数:

button.connect_clicked(move |button| {
    button.hide();
});