nodejs keydown/keyup事件 [英] nodejs keydown/keyup events

问题描述

我感兴趣的是查看是否可以将功能绑定到用户按下/释放键盘上的键的方式.

I'm interested in seeing if it's possible to bind functions to a user pressing/releasing a key on the keyboard.

到目前为止，我已经能够使用 keypress 模块和 process.stdin 的原始模式:

So far, I've been able to get key press events with the keypress module and process.stdin's raw mode:

var keypress = require('keypress');
keypress(process.stdin);
process.stdin.on('keypress', function(ch, key) {
    console.log('got "keypress"', key);
    if (key && key.ctrl && key.name == 'c') {
        process.exit();
    }
});
process.stdin.setRawMode(true);
process.stdin.resume();

捕获键盘按键并释放事件甚至可以在终端中进行吗?

Are capturing keyboard press and release events even possible in a terminal?

值得注意的是，我对任何浏览器实现都不感兴趣；我正在寻找可以在终端的NodeJS中运行的东西.

It should be worth noting that I am not interested in any browser implementations; I am looking for something that runs in NodeJS in a terminal.

谢谢.

推荐答案

所以我想出了一种解决方法，以限制 stdin 的局限性.

So I figured a workaround the limitations of stdin to get this to work.

基本上，我使用SDL库(及其节点绑定)在以下位置运行程序在键盘上侦听输入的背景.

Basically I use the SDL library (along with its node bindings) to run a program in the background that listens on the keyboard for input.

要这样做:

• 确保您正在运行节点版本〜0.10.(显然，在0.11上，节点上C绑定的工作方式有些不同吗?)
• 通过自制程序(在Mac上)安装 sdl ， sdl_ttf 和 sdl_image
• npm install --save https://github.com/creationix/node-sdl/tarball/master

然后是以下内容:

var sdl = require('sdl');

sdl.init(sdl.INIT.VIDEO);

while (true) {
    var e;
    while (e = sdl.pollEvent()) {
        console.log(e);
    }
}

SDL_PollEvent 要求使用 SDL_INIT_VIDEO 初始化SDL，这在上面的脚本中(在Mac上)在扩展坞中启动了一个单独的应用程序，该应用程序不绘制任何内容，但需要专注于接受输入.

SDL_PollEvent requires SDL be initialized with SDL_INIT_VIDEO, which in the script above (on a mac) starts a separate application in the dock that draws nothing, but needs to be focused to accept input.

虽然从技术上讲ANSI终端根本不支持按键事件，但这种解决方法完全可以让Node中的一个按键事件(尽管需要某些基于GUI的系统才能运行，即很可能无法在ssh上运行).

While it's technically true that ANSI terminals simply do not support keyup events, this workaround totally lets one grab keyup events in Node (albeit requiring some GUI-based system to function, i.e. most likely will not work over ssh).

这篇关于nodejs keydown/keyup事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！