NavigationRailLabelType 继承自： Enum

定义 NavigationRail 中目的地标签的显示方式。

该设置影响的是未展开（extended 为 False）时的导航栏布局。当导航栏处于展开状态时，无论该取值如何，标签都会显示在图标旁边。

示例

import flet as ft


def showcase_card(label_type: ft.NavigationRailLabelType) -> ft.Container:
    rail = ft.NavigationRail(
        width=100,
        height=220,
        selected_index=1,
        label_type=label_type,
        destinations=[
            ft.NavigationRailDestination(icon=ft.Icons.HOME, label="Home"),
            ft.NavigationRailDestination(icon=ft.Icons.SEARCH, label="Search"),
            ft.NavigationRailDestination(icon=ft.Icons.PERSON, label="Profile"),
        ],
    )

    return ft.Container(
        width=300,
        padding=12,
        border=ft.Border.all(1, ft.Colors.RED),
        border_radius=10,
        bgcolor=ft.Colors.SURFACE_CONTAINER_LOW,
        content=ft.Column(
            spacing=8,
            horizontal_alignment=ft.CrossAxisAlignment.CENTER,
            controls=[
                ft.Text(label_type.name, weight=ft.FontWeight.BOLD),
                rail,
            ],
        ),
    )


def main(page: ft.Page):
    page.horizontal_alignment = ft.CrossAxisAlignment.CENTER

    page.appbar = ft.AppBar(title="NavigationRailLabelType Showcase")
    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    ft.Text("Compare label visibility in compact navigation rail."),
                    ft.Row(
                        wrap=True,
                        spacing=12,
                        expand=True,
                        scroll=ft.ScrollMode.AUTO,
                        alignment=ft.MainAxisAlignment.CENTER,
                        controls=[showcase_card(t) for t in ft.NavigationRailLabelType],
                    ),
                ],
            ),
        )
    )


if __name__ == "__main__":
    ft.run(main)

枚举值

名称	类型	默认值	说明
NONE	—	'none'	Hides labels for all destinations. Only destination icons are shown.
ALL	—	'all'	Shows labels for all destinations.
SELECTED	—	'selected'	Shows the label only for the selected destination. As selection changes, the visible label transitions to the newly selected destination.