sticky.py

from typing import Literal

import streamlit as st

MARGINS = {
    "top": "0",
    "bottom": "0",
}

STICKY_CONTAINER_HTML = """
<style>
div[data-testid="stVerticalBlock"] div:has(div.fixed-header-{i}) {{
    position: sticky;
    {position}: {margin};
    background-color: white;
    z-index: {z};
}}
</style>
<div class='fixed-header-{i}'/>
""".strip()

# Not to apply the same style to multiple containers
count = 0


def sticky_container(
    *,
    height: int | None = None,
    border: bool | None = None,
    mode: Literal["top", "bottom"] = "top",
    margin: str | None = None,
    z:int |None=None
):
    if margin is None:
        margin = MARGINS[mode]

    global count
    html_code = STICKY_CONTAINER_HTML.format(position=mode, margin=margin, i=count,z=z)
    count += 1

    container = st.container(height=height, border=border)
    container.markdown(html_code, unsafe_allow_html=True)
    return container