Winit 输入助手

处理并存储 winit 事件，允许在任何时间查询输入状态。

使用方法

每个事件都通过 WinitInputHelper 的 update 方法传递。

然后可以通过如 key_pressed、key_released、key_held、mouse、mouse_diff 等方法访问当前输入状态。

要查看所有可用方法，请参阅 docs.rs

use winit::event_loop::EventLoop;
use winit::keyboard::{Key, KeyCode};
use winit::window::WindowBuilder;
use winit_input_helper::WinitInputHelper;

fn main() {
    let mut input = WinitInputHelper::new();

    let event_loop = EventLoop::new().unwrap();
    let _window = WindowBuilder::new().build(&event_loop).unwrap();

    event_loop
        .run(move |event, elwt| {
            // Pass every event to the WinitInputHelper.
            // It will return true when the last event has been processed and it is time to run your application logic.
            if input.update(&event) {
                if input.key_released(KeyCode::KeyQ) || input.close_requested() || input.destroyed()
                {
                    elwt.exit();
                    return;
                }

                if input.key_pressed(KeyCode::KeyW) {
                    println!("The 'W' key (US layout) was pressed on the keyboard");
                }

                if input.key_held(KeyCode::KeyR) {
                    println!("The 'R' key (US layout) key is held");
                }

                // query the change in cursor this update
                let cursor_diff = input.cursor_diff();
                if cursor_diff != (0.0, 0.0) {
                    println!("The cursor diff is: {:?}", cursor_diff);
                    println!("The cursor position is: {:?}", input.cursor());
                }

                // You are expected to control your own timing within this block.
                // Usually via rendering with vsync.
                // render();
            }
        })
        .unwrap();
}

发布新版本

为了避免强制用户启用默认的 winit 后端，winit_input_helper 将其 winit 依赖项设置为 default-features = false。这稍微复杂了发布过程，因为 winit 无法在没有启用任何后端的情况下编译。

因此，为了发布，我们运行： cargo publish --features winit/default