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AppBar

A material design app bar.

Examples​

Live example

AppBar​

import flet as ft

def main(page: ft.Page):
    def check_item_clicked(e):
        e.control.checked = not e.control.checked
        page.update()

    page.appbar = ft.AppBar(
        leading=ft.Icon(ft.icons.PALETTE),
        leading_width=40,
        title=ft.Text("AppBar Example"),
        center_title=False,
        bgcolor=ft.colors.SURFACE_VARIANT,
        actions=[
            ft.IconButton(ft.icons.WB_SUNNY_OUTLINED),
            ft.IconButton(ft.icons.FILTER_3),
            ft.PopupMenuButton(
                items=[
                    ft.PopupMenuItem(text="Item 1"),
                    ft.PopupMenuItem(),  # divider
                    ft.PopupMenuItem(
                        text="Checked item", checked=False, on_click=check_item_clicked
                    ),
                ]
            ),
        ],
    )
    page.add(ft.Text("Body!"))

ft.app(target=main)

Properties​

actions​

A list of Controls to display in a row after the title control.

Typically these controls are IconButtons representing common operations. For less common operations, consider using a PopupMenuButton as the last action.

Note that, if AppBar.adaptive=True and the app is opened on an iOS or macOS device, only the first element of this list will be used. This is because the CupertinoAppBar(which will be used on those two platforms) only accepts one - trailing - action control.

adaptive​

If the value is True, an adaptive AppBar is created based on whether the target platform is iOS/macOS.

On iOS and macOS, a CupertinoAppBar is created, which has matching functionality and presentation as AppBar, and the graphics as expected on iOS. On other platforms, a Material AppBar is created.

The default value is False.

automatically_imply_leading​

Controls whether we should try to imply the leading widget if null.

If True and leading is null, automatically try to deduce what the leading widget should be. If False and leading is null, leading space is given to title. If leading widget is not null, this parameter has no effect.

bgcolor​

The fill color to use for an AppBar. Default color is defined by current theme.

center_title​

Whether the title should be centered. Default is False.

clip_behavior​

The content will be clipped (or not) according to this option. See Container.clip_behavior for possible values.

color​

The default color for Text and Icons within the app bar. Default color is defined by current theme.

elevation​

The app bar's elevation. Defaults to 4.

Note: This effect is only visible when using the Material 2 design (when Theme.use_material3=False).

elevation_on_scroll​

The elevation to be used if this app bar has something scrolled underneath it.

exclude_header_semantics​

Whether the title should be wrapped with header Semantics. Default value is False.

force_material_transparency​

Forces the app bar to be transparent (instead of Material's default type).

This will also remove the visual display of bgcolor and elevation, and affect other characteristics of this app bar.

is_secondary​

Whether this app bar is not being displayed at the top of the screen. Default value is False.

leading​

A Control to display before the toolbar's title.

Typically the leading control is an Icon or an IconButton.

leading_width​

Defines the width of leading control. By default, the value of leading_width is 56.0.

shadow_color​

The color of the shadow below the app bar.

A shadow is only visible and displayed if the elevation is greater than zero.

shape​

The shape of the app bar's Material as well as its shadow.

surface_tint_color​

The color of the surface tint overlay applied to the app bar's bgcolor to indicate elevation.

By default, no overlay will be applied.

title​

The primary Control displayed in the app bar. Typically a Text control that contains a description of the current contents of the app.

Note that, if AppBar.adaptive=True and the app is opened on an iOS or macOS device, this control will be automatically centered.

title_spacing​

The spacing around title on the horizontal axis. It is applied even if there are no leading or actions controls.

If you want title to take all the space available, set this value to 0.0.

title_text_style​

The style to be used for the Text controls in the title. Value is an instance of type TextStyle.

toolbar_height​

Defines the height of the toolbar component of an AppBar. By default, the value of toolbar_height is 56.0.

toolbar_opacity​

The opacity of the toolbar. Value ranges from 0.0 (transparent) to 1.0 (fully opaque) which is the default.

toolbar_text_style​

The style to be used for the Text controls in the app bar's leading and actions (but not title). Value is an instance of type TextStyle.