{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 键盘\n",
    "\n",
    "添加全局键盘事件跟踪。\n",
    "\n",
    "- `on_key`：当键盘事件发生时执行的回调函数\n",
    "- `active`：指示是否应执行回调函数的布尔标志（默认：`True`）\n",
    "- `repeating`：指示是否应重复发送按住的键的布尔标志（默认：`True`）\n",
    "- `ignore`：当这些元素类型之一获得焦点时忽略按键（默认：`['input', 'select', 'button', 'textarea']`）"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<nicegui.elements.checkbox.Checkbox at 0x1e1f309e9d0>"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from nicegui import ui\n",
    "from nicegui.events import KeyEventArguments\n",
    "\n",
    "def handle_key(e: KeyEventArguments):\n",
    "    if e.key == 'f' and not e.action.repeat:\n",
    "        if e.action.keyup:\n",
    "            ui.notify('f was just released')\n",
    "        elif e.action.keydown:\n",
    "            ui.notify('f was just pressed')\n",
    "    if e.modifiers.shift and e.action.keydown:\n",
    "        if e.key.arrow_left:\n",
    "            ui.notify('going left')\n",
    "        elif e.key.arrow_right:\n",
    "            ui.notify('going right')\n",
    "        elif e.key.arrow_up:\n",
    "            ui.notify('going up')\n",
    "        elif e.key.arrow_down:\n",
    "            ui.notify('going down')\n",
    "\n",
    "keyboard = ui.keyboard(on_key=handle_key)\n",
    "ui.label('Key events can be caught globally by using the keyboard element.')\n",
    "ui.checkbox('Track key events').bind_value_to(keyboard, 'active')\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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