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Dockerfile

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+FROM python:3.9
+
+RUN useradd -ms /bin/bash user
+
+USER user
+
+ENV HOME=/home/user \
+	PATH=/home/user/.local/bin:$PATH
+
+WORKDIR $HOME/code
+
+COPY ./requirements.txt $HOME/code/requirements.txt
+
+RUN pip install --no-cache-dir --upgrade -r $HOME/code/requirements.txt
+
+COPY --chown=user . $HOME/code
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]

main.py

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+import flet as ft
+from flet import TextField, ElevatedButton
+from flet_core import ControlEvent
+import flet_fastapi
+
+async def main(page: ft.Page) -> None:
+    page.title = "Some form"
+
+    dlg = ft.AlertDialog(
+        title=ft.Text("This doesn't work yet!"), on_dismiss=lambda e: print("Dialog dismissed!")
+    )
+
+    async def open_dlg(e: ControlEvent):
+        page.dialog = dlg
+        dlg.open = True
+        await page.update_async()
+
+    question: TextField = TextField(label="Question", text_align=ft.TextAlign.LEFT, width=200)
+    answer: TextField = TextField(label="Answer", text_align=ft.TextAlign.LEFT, width=200)
+    
+    button_submit: ElevatedButton = ElevatedButton(text="Send", disabled=True)
+
+    async def validate(e: ControlEvent) -> None:
+        if all((question.value, answer.value)):
+            button_submit.disabled = False
+        else:
+            button_submit.disabled = True
+
+        await page.update_async()
+    
+    async def submit(e: ControlEvent) -> None:
+        await open_dlg(e)
+    
+    question.on_change = validate
+    answer.on_change = validate
+    button_submit.on_click = submit
+
+
+    await page.add_async(
+        ft.Container(question, alignment=ft.alignment.center)
+    )
+
+    await page.add_async(
+        ft.Container(answer, alignment=ft.alignment.center)
+    )
+
+    await page.add_async(
+        ft.Container(button_submit, alignment=ft.alignment.center)
+    )
+
+app = flet_fastapi.app(main) # type: ignore

requirements.txt

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+uvicorn
+fastapi
+flet
+flet-fastapi