Fleet tutorial 09 basic introduction to navigationrail (tutorial includes source code)

Flet What is it?

Flet It's a framework , Make it easy for you to build real-time in your favorite language Web、 Mobile and desktop applications , And share them safely with your team . No front-end experience .

What is? NavigationRail

A material widget , Designed to be displayed on the left or right side of the application , To navigate between a few views , Usually between three and five .

Combat code

import flet
from flet import (
    AppBar,
    Icon,
    IconButton,
    Page,
    PopupMenuButton,
    PopupMenuItem,
    Text,
    colors,
    icons,
)

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

    page.appbar = AppBar(
        leading=Icon(icons.PALETTE),
        leading_width=40,
        title=Text("AppBar Example"),
        center_title=False,
        bgcolor=colors.SURFACE_VARIANT,
        actions=[
            IconButton(icons.WB_SUNNY_OUTLINED),
            IconB