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Banner

A banner displays an important, succinct message, and provides actions for users to address (or dismiss the banner). A user action is required for it to be dismissed.

Banners are displayed at the top of the screen, below a top app bar. They are persistent and non-modal, allowing the user to either ignore them or interact with them at any time.

Example:

banner = ft.Banner(
    leading=ft.Icon(ft.Icons.INFO_OUTLINED, color=ft.Colors.PRIMARY),
    content=ft.Text("Backup completed successfully."),
    actions=[ft.TextButton("Dismiss")],
    bgcolor=ft.Colors.SURFACE_CONTAINER_LOW,
    open=True,
)
page.show_dialog(banner)
Banner
Basic Banner

Inherits: DialogControl

Properties

Events

  • on_visible - Called when this banner is shown or made visible for the first time.

Examples​

Live example

Basic example​

import flet as ft


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

    def handle_banner_close(e: ft.Event[ft.TextButton]):
        page.pop_dialog()
        page.add(ft.Text("Action clicked: " + e.control.data))

    action_button_style = ft.ButtonStyle(color=ft.Colors.BLUE)
    banner = ft.Banner(
        bgcolor=ft.Colors.AMBER_100,
        leading=ft.Icon(ft.Icons.WARNING_AMBER_ROUNDED, color=ft.Colors.AMBER, size=40),
        content=ft.Text(
            value="Oops, there were some errors while trying to delete the file. "
            "What would you like to do?",
            color=ft.Colors.BLACK,
        ),
        actions=[
            ft.TextButton(
                content="Retry",
                style=action_button_style,
                on_click=handle_banner_close,
                data="retry",
            ),
            ft.TextButton(
                content="Ignore",
                style=action_button_style,
                on_click=handle_banner_close,
                data="ignore",
            ),
            ft.TextButton(
                content="Cancel",
                style=action_button_style,
                on_click=handle_banner_close,
                data="cancel",
            ),
        ],
    )

    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    ft.Button(
                        "Show Banner", on_click=lambda e: page.show_dialog(banner)
                    )
                ]
            )
        )
    )


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

Properties​

actionsinstance-attribute​

actions: Annotated[list[Control], V.visible_controls(min_count=1)]

The set of actions that are displayed at the bottom or trailing side of this banner.

Typically this is a list of TextButton controls.

Raises:

  • ValueError - If it does not contain at least one visible Control.

bgcolorclass-attributeinstance-attribute​

bgcolor: Optional[ColorValue] = None

The color of the surface of this banner.

contentinstance-attribute​

content: Annotated[StrOrControl, V.str_or_visible_control()]

The content of this banner.

Typically a Text control.

Raises:

  • ValueError - If content is not visible.

content_paddingclass-attributeinstance-attribute​

content_padding: Optional[PaddingValue] = None

The amount of space by which to inset the content.

If the actions are below the content, this defaults to Padding.only(left=16.0, top=24.0, right=16.0, bottom=4.0).

If the actions are trailing the content, this defaults to Padding.only(left=16.0, top=2.0).

content_text_styleclass-attributeinstance-attribute​

content_text_style: Optional[TextStyle] = None

The style to be used for the Text controls in the content.

divider_colorclass-attributeinstance-attribute​

divider_color: Optional[ColorValue] = None

The color of the divider.

elevationclass-attributeinstance-attribute​

elevation: Annotated[Optional[Number], V.ge(0)] = None

The elevation of this banner.

Raises:

  • ValueError - If it is not greater than or equal to 0.

force_actions_belowclass-attributeinstance-attribute​

force_actions_below: bool = False

An override to force the actions to be below the content regardless of how many there are.

If this is True, the actions will be placed below the content. If this is False, the actions will be placed on the trailing side of the content if actions length is 1 and below the content if greater than 1.

leadingclass-attributeinstance-attribute​

leading: Optional[IconDataOrControl] = None

The leading Control of this banner.

Typically an Icon control.

leading_paddingclass-attributeinstance-attribute​

leading_padding: Optional[PaddingValue] = None

The amount of space by which to inset the leading control.

Defaults to flet.BannerTheme.leading_padding, or if that is None, falls back to Padding.only(end=16).

marginclass-attributeinstance-attribute​

margin: Optional[MarginValue] = None

The amount of space surrounding this banner.

min_action_bar_heightclass-attributeinstance-attribute​

min_action_bar_height: Number = 52.0

The minimum action bar height.

shadow_colorclass-attributeinstance-attribute​

shadow_color: Optional[ColorValue] = None

The color of the shadow below this banner.

Events​

on_visibleclass-attributeinstance-attribute​

on_visible: Optional[ControlEventHandler[Banner]] = None

Called when this banner is shown or made visible for the first time.