Assertiveness 继承自： Enum

Determines the assertiveness level of the accessibility announcement.

示例

import flet as ft


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

    def showcase_card(assertiveness: ft.Assertiveness) -> ft.Container:
        status = ft.Text("Send an accessibility announcement.", size=11)

        async def announce():
            try:
                await semantics.announce_message(
                    f"Announcement with {assertiveness.name} assertiveness.",
                    assertiveness=assertiveness,
                )
                status.value = f"Sent with {assertiveness.value}."
            except Exception as ex:
                status.value = f"Error: {ex}"
            status.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(assertiveness.name, weight=ft.FontWeight.BOLD),
                    ft.Text(
                        assertiveness.value,
                        size=11,
                        color=ft.Colors.ON_SURFACE_VARIANT,
                    ),
                    ft.Button(
                        "Announce message",
                        icon=ft.Icons.RECORD_VOICE_OVER,
                        on_click=lambda: page.run_task(announce),
                    ),
                    status,
                ],
            ),
        )

    page.appbar = ft.AppBar(title="Assertiveness Showcase")
    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    ft.Text(
                        "Compare announcement assertiveness levels. "
                        "Enable a screen reader to hear the difference."
                    ),
                    ft.Row(
                        wrap=True,
                        spacing=12,
                        expand=True,
                        scroll=ft.ScrollMode.AUTO,
                        alignment=ft.MainAxisAlignment.CENTER,
                        controls=[
                            showcase_card(assertiveness)
                            for assertiveness in ft.Assertiveness
                        ],
                    ),
                ]
            )
        )
    )


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

枚举值

名称	类型	默认值	说明
POLITE	—	'polite'	The assistive technology will speak changes whenever the user is idle.
ASSERTIVE	—	'assertive'	The assistive technology will interrupt any announcement that it is currently making to notify the user about the change. It should only be used for time-sensitive/critical notifications.