如何派发具有特定 KeyCode 的 KeyboardEvent

Question

我尝试为 esc 键发送一个键盘事件（用于测试）这是我到目前为止得到的：

  KeyboardEvent keyEvent = new KeyboardEvent('keypress');

  window.onKeyPress.listen((KeyboardEvent event){
    KeyEvent keyEvent = new KeyEvent.wrap(event);
    if(keyEvent.keyCode == KeyCode.ESC){
      //do stuff
    }
  });

  window.dispatchEvent(keyEvent);

这按预期工作。 onKeyPress 侦听器触发器。

但是我没有找到如何为我的 KeyBoardEvent 设置 KeyCode？

Answer 1

无法使用 dispatchEvent。尝试：

import 'dart:async';
import 'dart:html';

void main() {
  Stream stream = KeyEvent.keyPressEvent.forTarget(document.body);
  stream.listen((KeyEvent keyEvent){
    if(keyEvent.keyCode == KeyCode.ESC) {
        // do stuff
    }
  });
  stream.add(new KeyEvent('keypress', keyCode: KeyCode.ESC));
}

如https://api.dartlang.org/apidocs/channels/stable/dartdoc-viewer/dart:html.KeyEvent

所述

如何派发具有特定 KeyCode 的 KeyboardEvent

How to dispatch an KeyboardEvent with specific KeyCode

keyboard

events

dart