AnimatedSwitcherTransition 继承自： Enum

transition 所使用的视觉切换策略。

控制切换发生时旧内容与新内容如何产生动画。

示例

import flet as ft


def showcase_card(transition: ft.AnimatedSwitcherTransition) -> ft.Container:
    state = 0
    values = ["A", "B"]

    switcher = ft.AnimatedSwitcher(
        duration=500,
        reverse_duration=300,
        transition=transition,
        content=ft.Text(
            values[0],
            size=40,
            weight=ft.FontWeight.BOLD,
        ),
    )

    def swap(_):
        nonlocal state
        state = 1 - state
        switcher.content = ft.Text(
            values[state],
            size=40,
            weight=ft.FontWeight.BOLD,
        )
        switcher.update()

    return ft.Container(
        width=320,
        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(transition.name, weight=ft.FontWeight.BOLD),
                ft.Container(
                    width=240,
                    height=90,
                    border=ft.Border.all(1, ft.Colors.OUTLINE),
                    border_radius=8,
                    bgcolor=ft.Colors.SURFACE,
                    alignment=ft.Alignment.CENTER,
                    content=switcher,
                ),
                ft.Button("Swap", on_click=swap),
            ],
        ),
    )


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

    page.appbar = ft.AppBar(title="AnimatedSwitcherTransition Showcase")
    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    ft.Text("Swap content to compare switcher transition effects."),
                    ft.Row(
                        wrap=True,
                        spacing=12,
                        expand=True,
                        scroll=ft.ScrollMode.AUTO,
                        alignment=ft.MainAxisAlignment.CENTER,
                        controls=[
                            showcase_card(transition)
                            for transition in ft.AnimatedSwitcherTransition
                        ],
                    ),
                ]
            )
        )
    )


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

枚举值

名称	类型	默认值	说明
FADE	—	'fade'	Cross-fades between outgoing and incoming content.
ROTATION	—	'rotation'	Rotates content during the switch.
SCALE	—	'scale'	Scales content during the switch.