TabAlignment 继承自： Enum

Defines how tabs are aligned horizontally in a Tabs.

示例

import flet as ft


def showcase_card(alignment: ft.TabAlignment) -> ft.Container:
    scrollable = alignment != ft.TabAlignment.FILL
    tabs_count = 4

    tab_bar = ft.TabBar(
        scrollable=scrollable,
        tab_alignment=alignment,
        tabs=[ft.Tab(label=f"Tab {i + 1}") for i in range(tabs_count)],
    )

    tab_view = ft.Container(
        height=70,
        alignment=ft.Alignment.CENTER,
        border=ft.Border.all(1, ft.Colors.OUTLINE),
        border_radius=8,
        bgcolor=ft.Colors.SURFACE,
        content=ft.TabBarView(
            controls=[
                ft.Container(
                    alignment=ft.Alignment.CENTER,
                    content=ft.Text(f"View {i + 1}"),
                )
                for i in range(tabs_count)
            ]
        ),
    )

    return ft.Container(
        width=380,
        padding=12,
        border=ft.Border.all(1, ft.Colors.RED),
        border_radius=10,
        bgcolor=ft.Colors.SURFACE_CONTAINER_LOW,
        content=ft.Column(
            spacing=8,
            controls=[
                ft.Text(alignment.name, weight=ft.FontWeight.BOLD),
                ft.Tabs(
                    length=tabs_count,
                    selected_index=1,
                    content=ft.Column(spacing=8, controls=[tab_bar, tab_view]),
                ),
            ],
        ),
    )


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

    page.appbar = ft.AppBar(title="TabAlignment Showcase")
    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    ft.Text("Compare how tabs are positioned within the tab bar."),
                    ft.Row(
                        wrap=True,
                        spacing=12,
                        expand=True,
                        scroll=ft.ScrollMode.AUTO,
                        alignment=ft.MainAxisAlignment.CENTER,
                        controls=[
                            showcase_card(alignment) for alignment in ft.TabAlignment
                        ],
                    ),
                ],
            ),
        )
    )


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

枚举值

名称	类型	默认值	说明
START	—	'start'	If scrollable is True, tabs are aligned to the start of the TabBar.
START_OFFSET	—	'startOffset'	If scrollable is True, tabs are aligned to the start of the TabBar with an offset of 52.0 pixels.
FILL	—	'fill'	If scrollable is False, tabs are stretched to fill the TabBar.
CENTER	—	'center'	Tabs are aligned to the center of the TabBar.