class MyContainer(ft.Container):
    def __init__(self, text):
        super().__init__(
            height=150,
            bgcolor=ft.Colors.random(),
            alignment=ft.Alignment.CENTER,
        )
        self.content = ft.Text(text)


def main(page: ft.Page):
    def handle_new_tab(e: ft.Event[ft.CupertinoFilledButton]):
        bar.tabs.append(ft.Tab(label=ft.Text(f"Tab {len(bar.tabs) + 1}")))
        view.controls.append(MyContainer(text=f"Tab {len(view.controls) + 1} content"))
        tabs.length = len(bar.tabs)

    def handle_move_to(e: ft.Event[ft.CupertinoFilledButton]):
        tabs.move_to(
            index=0,
            animation_curve=ft.AnimationCurve.FAST_OUT_SLOWIN,
            animation_duration=ft.Duration(seconds=3),
        )
        # or
        # tabs.selected_index = 0

    page.add(
        tabs := ft.Tabs(
            length=3,
            expand=True,
            on_change=print,
            animation_duration=ft.Duration(seconds=3),
            content=ft.Column(
                expand=True,
                controls=[
                    bar := ft.TabBar(
                        # on_hover=print,
                        tab_alignment=ft.TabAlignment.CENTER,
                        indicator=ft.UnderlineTabIndicator(
                            border_side=ft.BorderSide(3, ft.Colors.RED),
                            border_radius=10,
                        ),
                        tabs=[
                            ft.Tab(label=ft.Text("Tab 1")),
                            ft.Tab(label=ft.Text("Tab 2")),
                            ft.Text("Tab 3"),
                        ],
                    ),
                    ft.Row(
                        alignment=ft.MainAxisAlignment.CENTER,
                        controls=[
                            ft.CupertinoFilledButton(
                                content="Add new Tab",
                                icon=ft.Icons.ADD,
                                on_click=handle_new_tab,
                            ),
                            ft.CupertinoFilledButton(
                                content="Move to Tab 1",
                                icon=ft.Icons.MOVE_UP,
                                on_click=handle_move_to,
                            ),
                        ],
                    ),
                    view := ft.TabBarView(
                        expand=True,
                        controls=[
                            ft.Column(  # must be used so container respects its size
                                expand=True,
                                controls=[MyContainer(text="Tab 1 content")],
                            ),
                            MyContainer(text="Tab 2 content"),
                            ft.Tabs(
                                length=2,
                                expand=True,
                                content=ft.Column(
                                    expand=True,
                                    controls=[
                                        ft.TabBar(
                                            secondary=True,
                                            tabs=[
                                                ft.Tab(label=ft.Text("SubTab 1")),
                                                ft.Tab(label=ft.Text("SubTab 2")),
                                            ],
                                        ),
                                        ft.TabBarView(
                                            expand=True,
                                            controls=[
                                                MyContainer(text="Sub Tab 1 content"),
                                                ft.Text("Sub Tab 2 content"),
                                            ],
                                        ),
                                    ],
                                ),
                            ),
                        ],
                    ),
                ],
            ),
        )
    )