streamlit

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# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2024)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import streamlit as st
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from streamlit import runtime
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single_file = st.file_uploader("Drop a file:", type=["txt"], key="single")
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if single_file is None:
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    st.text("No upload")
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else:
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    st.text(single_file.read())
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# Here and throughout this file, we use `if runtime.is_running():`
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# since we also run e2e python files in "bare Python mode" as part of our
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# Python tests, and this doesn't work in that circumstance
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# st.session_state can only be accessed while running with streamlit
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if runtime.exists():
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    st.write(repr(st.session_state.single) == repr(single_file))
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disabled = st.file_uploader(
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    "Can't drop a file:", type=["txt"], key="disabled", disabled=True
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)
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if disabled is None:
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    st.text("No upload")
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else:
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    st.text(disabled.read())
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if runtime.exists():
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    st.write(repr(st.session_state.disabled) == repr(disabled))
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multiple_files = st.file_uploader(
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    "Drop multiple files:",
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    type=["txt"],
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    accept_multiple_files=True,
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    key="multiple",
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)
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if multiple_files is None:
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    st.text("No upload")
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else:
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    files = [file.read().decode() for file in multiple_files]
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    st.text("\n".join(files))
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if runtime.exists():
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    st.write(repr(st.session_state.multiple) == repr(multiple_files))
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with st.form("foo"):
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    form_file = st.file_uploader("Inside form:", type=["txt"])
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    st.form_submit_button("Submit")
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    if form_file is None:
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        st.text("No upload")
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    else:
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        st.text(form_file.read())
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hidden_label = st.file_uploader(
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    "Hidden label:",
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    key="hidden_label",
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    label_visibility="hidden",
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)
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if hidden_label is None:
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    st.text("No upload")
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else:
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    st.text(hidden_label.read())
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if runtime.exists():
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    st.write(repr(st.session_state.hidden_label) == repr(hidden_label))
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collapsed_label = st.file_uploader(
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    "Collapsed label:",
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    key="collapsed_label",
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    label_visibility="collapsed",
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)
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if collapsed_label is None:
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    st.text("No upload")
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else:
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    st.text(collapsed_label.read())
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if runtime.exists():
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    st.write(repr(st.session_state.collapsed_label) == repr(collapsed_label))
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if runtime.exists():
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    if not st.session_state.get("counter"):
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        st.session_state["counter"] = 0
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    def file_uploader_on_change():
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        st.session_state.counter += 1
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    st.file_uploader(
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        "Drop a file:",
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        type=["txt"],
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        key="on_change_file_uploader_key",
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        on_change=file_uploader_on_change,
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    )
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    st.text(st.session_state.counter)
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