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   "source": [
    "# 分步器\n",
    "\n",
    "这个元素代表了 Quasar 的 [QStepper 组件](https://quasar.dev/vue-components/stepper#qstepper-api)。它包含各个独立的步骤。\n",
    "\n",
    "为了避免在切换步骤时出现动态元素的问题，这个元素使用了 Vue 的 keep-alive 组件。如果客户端性能是一个问题，您可以禁用此功能。\n",
    "\n",
    "`value`：ui.step 或最初选择的步骤的名称（默认：`None`，表示第一步）\n",
    "`on_value_change`：当选定的步骤发生变化时要执行的回调函数\n",
    "`keep_alive`：是否在内容上使用 Vue 的 keep-alive 组件（默认：`True`）"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from nicegui import ui\n",
    "\n",
    "with ui.stepper().props('vertical').classes('w-full') as stepper:\n",
    "    with ui.step('Preheat'):\n",
    "        ui.label('Preheat the oven to 350 degrees')\n",
    "        with ui.stepper_navigation():\n",
    "            ui.button('Next', on_click=stepper.next)\n",
    "    with ui.step('Ingredients'):\n",
    "        ui.label('Mix the ingredients')\n",
    "        with ui.stepper_navigation():\n",
    "            ui.button('Next', on_click=stepper.next)\n",
    "            ui.button('Back', on_click=stepper.previous).props('flat')\n",
    "    with ui.step('Bake'):\n",
    "        ui.label('Bake for 20 minutes')\n",
    "        with ui.stepper_navigation():\n",
    "            ui.button('Done', on_click=lambda: ui.notify('Yay!', type='positive'))\n",
    "            ui.button('Back', on_click=stepper.previous).props('flat')\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 动态分步器\n",
    "\n",
    "步骤可以动态添加，并通过 `ui.move()` 定位。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "from nicegui import ui\n",
    "\n",
    "def next_step() -> None:\n",
    "    if extra_step.value and len(stepper.default_slot.children) == 2:\n",
    "        with stepper:\n",
    "            with ui.step('extra') as extra:\n",
    "                ui.label('Extra')\n",
    "                with ui.stepper_navigation():\n",
    "                    ui.button('Back', on_click=stepper.previous).props('flat')\n",
    "                    ui.button('Next', on_click=stepper.next)\n",
    "            extra.move(target_index=1)\n",
    "    stepper.next()\n",
    "\n",
    "with ui.stepper().props('vertical').classes('w-full') as stepper:\n",
    "    with ui.step('start'):\n",
    "        ui.label('Start')\n",
    "        extra_step = ui.checkbox('do extra step')\n",
    "        with ui.stepper_navigation():\n",
    "            ui.button('Next', on_click=next_step)\n",
    "    with ui.step('finish'):\n",
    "        ui.label('Finish')\n",
    "        with ui.stepper_navigation():\n",
    "            ui.button('Back', on_click=stepper.previous).props('flat')\n",
    "\n",
    "# ui.run()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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