KeyDownEvent 继承自： Event['KeyboardListener']

按键被按下时触发的事件。

通常用于在按键被释放或重复之前，检测其最初的按下动作。

属性

名称	类型	默认值	说明
key	str	required	The key that was pressed down. Represents the physical key (e.g., A, Enter, Shift) that triggered the key down event.