{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 自动上下文\n",
    "\n",
    "为了便于编写直观的 UI 描述，NiceGUI 会自动跟踪创建元素的上下文。这意味着没有显式的父参数。相反，父上下文是使用 `with` 语句定义的。它也会被传递给事件处理器和计时器。\n",
    "\n",
    "在示例中，标签 \"Card content\" 被添加到卡片中。因为 `ui.button` 也被添加到卡片中，所以标签 `\"Click!\"` 也将在此上下文中创建。一秒后添加的标签 `\"Tick!\"` 也被添加到卡片中。\n",
    "\n",
    "这种设计决策允许轻松创建模块化组件，这些组件在 UI 中移动后仍能正常工作。例如，您可以将标签和按钮移动到其他地方，也许将它们包装在另一个容器中，代码仍然可以正常工作。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from nicegui import ui\n",
    "\n",
    "with ui.card():\n",
    "    ui.label('Card content')\n",
    "    ui.button('Add label', on_click=lambda: ui.label('Click!'))\n",
    "    ui.timer(1.0, lambda: ui.label('Tick!'), once=True)\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "py311",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.11.7"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}