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NavigationRail

A material widget that is meant to be displayed at the left or right of an app to navigate between a small number of views, typically between three and five.

Examples​

Live example

import flet as ft

def main(page: ft.Page):

    rail = ft.NavigationRail(
        selected_index=0,
        label_type=ft.NavigationRailLabelType.ALL,
        # extended=True,
        min_width=100,
        min_extended_width=400,
        leading=ft.FloatingActionButton(icon=ft.icons.CREATE, text="Add"),
        group_alignment=-0.9,
        destinations=[
            ft.NavigationRailDestination(
                icon=ft.icons.FAVORITE_BORDER, selected_icon=ft.icons.FAVORITE, label="First"
            ),
            ft.NavigationRailDestination(
                icon_content=ft.Icon(ft.icons.BOOKMARK_BORDER),
                selected_icon_content=ft.Icon(ft.icons.BOOKMARK),
                label="Second",
            ),
            ft.NavigationRailDestination(
                icon=ft.icons.SETTINGS_OUTLINED,
                selected_icon_content=ft.Icon(ft.icons.SETTINGS),
                label_content=ft.Text("Settings"),
            ),
        ],
        on_change=lambda e: print("Selected destination:", e.control.selected_index),
    )

    page.add(
        ft.Row(
            [
                rail,
                ft.VerticalDivider(width=1),
                ft.Column([ ft.Text("Body!")], alignment=ft.MainAxisAlignment.START, expand=True),
            ],
            expand=True,
        )
    )

ft.app(main)

bgcolor​

Sets the color of the Container that holds all of the NavigationRail's contents.

destinations​

Defines the appearance of the button items that are arrayed within the navigation rail.

The value must be a list of two or more NavigationRailDestination instances.

elevation​

Controls the size of the shadow below the NavigationRail.

Defaults to 0.0.

extended​

Indicates that the NavigationRail should be in the extended state.

The extended state has a wider rail container, and the labels are positioned next to the icons. min_extended_width can be used to set the minimum width of the rail when it is in this state.

The rail will implicitly animate between the extended and normal state.

If the rail is going to be in the extended state, then the label_type must be set to none.

Defaults to False.

group_alignment​

The vertical alignment for the group of destinations within the rail.

The NavigationRailDestinations are grouped together with the trailing widget, between the leading widget and the bottom of the rail.

The value must be between -1.0 and 1.0.

If group_alignment is -1.0, then the items are aligned to the top. If group_alignment is 0.0, then the items are aligned to the center. If group_alignment is 1.0, then the items are aligned to the bottom.

Defaults to -1.0.

indicator_color​

The color of the navigation rail's indicator.

indicator_shape​

The shape of the navigation rail's indicator.

Value is of type OutlinedBorder and defaults to StadiumBorder().

label_type​

Defines the layout and behavior of the labels for the default, unextended navigation rail.

When a navigation rail is extended, the labels are always shown.

Value is of type NavigationRailLabelType and defaults to None - no labels are shown.

leading​

An optional leading control in the rail that is placed above the destinations.

Its location is not affected by group_alignment.

This is commonly a FloatingActionButton, but may also be a non-button, such as a logo.

min_extended_width​

The final width when the animation is complete for setting extended to True.

Defaults to 256.

min_width​

The smallest possible width for the rail regardless of the destination's icon or label size.

Defaults to 72.

This value also defines the min width and min height of the destinations.

To make a compact rail, set this to 56 and use label_type='none'.

selected_index​

The index into destinations for the current selected NavigationRailDestination or None if no destination is selected.

selected_label_text_style​

The TextStyle of a destination's label when it is selected.

When a destination is not selected, unselected_label_text_style will instead be used.

trailing​

An optional trailing control in the rail that is placed below the destinations.

Its location is affected by group_alignment.

This is commonly a list of additional options or destinations that is usually only rendered when extended=True.

unselected_label_text_style​

The TextStyle of a destination's label when it is not selected.

When a destination is selected, selected_label_text_style will instead be used.

on_change​

Fires when selected destination changed.

icon​

The name of the icon of the destination.

icon_content​

The icon Control of the destination. Typically the icon is an Icon control. Used instead of icon property.

If selected_icon_content is provided, this will only be displayed when the destination is not selected.

To make the NavigationRail more accessible, consider choosing an icon with a stroked and filled version, such as icons.CLOUD and icons.CLOUD_QUEUE. The icon should be set to the stroked version and selected_icon to the filled version.

indicator_color​

The color of the indicator_shape when this destination is selected.

indicator_shape​

The shape of the selection indicator. The value is an instance of OutlinedBorder class.

label​

A string representing the destination's label. Will be displayed only if label_content is not provided.

label_content​

The label Control for the destination. If this is provided, then label will be ignored.

The label must be provided when used with the NavigationRail. When NavigationRail.label_type=NavigationRailLabelType.NONE, the label is still used for semantics, and may still be used if NavigationRail.extended=True.

padding​

The amount of space to inset the destination item.

Padding is an instance of Padding class.

selected_icon​

The name of alternative icon displayed when this destination is selected.

selected_icon_content​

An alternative icon Control displayed when this destination is selected.

If this icon is not provided, the NavigationRail will display icon_content in either state.