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72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
# Copyright 2018-2022 Streamlit Inc.
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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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from typing import cast
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import streamlit
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from streamlit.proto.Empty_pb2 import Empty as EmptyProto
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class EmptyMixin:
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def empty(self):
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"""Insert a single-element container.
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Inserts a container into your app that can be used to hold a single element.
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This allows you to, for example, remove elements at any point, or replace
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several elements at once (using a child multi-element container).
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To insert/replace/clear an element on the returned container, you can
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use "with" notation or just call methods directly on the returned object.
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See examples below.
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Examples
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--------
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Overwriting elements in-place using "with" notation:
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>>> import time
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>>>
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>>> with st.empty():
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... for seconds in range(60):
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... st.write(f"⏳ {seconds} seconds have passed")
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... time.sleep(1)
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... st.write("✔️ 1 minute over!")
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Replacing several elements, then clearing them:
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>>> placeholder = st.empty()
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>>>
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>>> # Replace the placeholder with some text:
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>>> placeholder.text("Hello")
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>>>
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>>> # Replace the text with a chart:
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>>> placeholder.line_chart({"data": [1, 5, 2, 6]})
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>>>
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>>> # Replace the chart with several elements:
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>>> with placeholder.container():
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... st.write("This is one element")
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... st.write("This is another")
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...
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>>> # Clear all those elements:
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>>> placeholder.empty()
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"""
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empty_proto = EmptyProto()
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return self.dg._enqueue("empty", empty_proto)
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@property
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def dg(self) -> "streamlit.delta_generator.DeltaGenerator":
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"""Get our DeltaGenerator."""
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return cast("streamlit.delta_generator.DeltaGenerator", self)
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