lightning/examples/app_layout/app.py

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"""An example showcasing how `configure_layout` can be used to nest user interfaces of different flows.
Run the app:
lightning run app examples/layout/demo.py
This starts one server for each flow that returns a UI. Access the UI at the link printed in the terminal.
"""
import os
from time import sleep
import lightning as L
from lightning.app.frontend.stream_lit import StreamlitFrontend
from lightning.app.frontend.web import StaticWebFrontend
class C11(L.LightningFlow):
def __init__(self):
super().__init__()
self.message = "Hello Streamlit!"
def run(self):
pass
def configure_layout(self):
return StreamlitFrontend(render_fn=render_c11)
def render_c11(state):
import streamlit as st
st.write(state.message)
class C21(L.LightningFlow):
def __init__(self):
super().__init__()
def run(self):
pass
def configure_layout(self):
return StaticWebFrontend(os.path.join(os.path.dirname(__file__), "ui1"))
class C22(L.LightningFlow):
def __init__(self):
super().__init__()
def run(self):
pass
def configure_layout(self):
return StaticWebFrontend(os.path.join(os.path.dirname(__file__), "ui2"))
class C1(L.LightningFlow):
def __init__(self):
super().__init__()
self.c11 = C11()
def run(self):
pass
class C2(L.LightningFlow):
def __init__(self):
super().__init__()
self.c21 = C21()
self.c22 = C22()
def run(self):
pass
def configure_layout(self):
return [
dict(name="one", content=self.c21),
dict(name="two", content=self.c22),
]
class Root(L.LightningFlow):
def __init__(self):
super().__init__()
self.c1 = C1()
self.c2 = C2()
def run(self):
sleep(10)
self._exit("Layout End")
def configure_layout(self):
return [
dict(name="one", content=self.c1.c11),
dict(name="two", content=self.c2),
dict(name="three", content="https://lightning.ai"),
]
app = L.LightningApp(Root())