283 lines
10 KiB
Python
283 lines
10 KiB
Python
# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2025)
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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 __future__ import annotations
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from dataclasses import dataclass
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from textwrap import dedent
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from typing import TYPE_CHECKING, Union, cast
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from typing_extensions import TypeAlias
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from streamlit.elements.lib.file_uploader_utils import enforce_filename_restriction
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from streamlit.elements.lib.form_utils import current_form_id
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from streamlit.elements.lib.layout_utils import LayoutConfig, validate_width
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from streamlit.elements.lib.policies import (
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check_widget_policies,
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maybe_raise_label_warnings,
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)
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from streamlit.elements.lib.utils import (
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Key,
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LabelVisibility,
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compute_and_register_element_id,
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get_label_visibility_proto_value,
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to_key,
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)
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from streamlit.elements.widgets.file_uploader import _get_upload_files
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from streamlit.proto.CameraInput_pb2 import CameraInput as CameraInputProto
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from streamlit.proto.Common_pb2 import FileUploaderState as FileUploaderStateProto
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from streamlit.proto.Common_pb2 import UploadedFileInfo as UploadedFileInfoProto
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from streamlit.runtime.metrics_util import gather_metrics
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from streamlit.runtime.scriptrunner import ScriptRunContext, get_script_run_ctx
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from streamlit.runtime.state import (
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WidgetArgs,
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WidgetCallback,
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WidgetKwargs,
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register_widget,
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)
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from streamlit.runtime.uploaded_file_manager import DeletedFile, UploadedFile
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if TYPE_CHECKING:
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from streamlit.delta_generator import DeltaGenerator
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from streamlit.elements.lib.layout_utils import WidthWithoutContent
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SomeUploadedSnapshotFile: TypeAlias = Union[UploadedFile, DeletedFile, None]
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@dataclass
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class CameraInputSerde:
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def serialize(
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self,
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snapshot: SomeUploadedSnapshotFile,
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) -> FileUploaderStateProto:
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state_proto = FileUploaderStateProto()
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if snapshot is None or isinstance(snapshot, DeletedFile):
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return state_proto
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file_info: UploadedFileInfoProto = state_proto.uploaded_file_info.add()
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file_info.file_id = snapshot.file_id
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file_info.name = snapshot.name
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file_info.size = snapshot.size
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file_info.file_urls.CopyFrom(snapshot._file_urls)
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return state_proto
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def deserialize(
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self, ui_value: FileUploaderStateProto | None
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) -> SomeUploadedSnapshotFile:
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upload_files = _get_upload_files(ui_value)
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return_value = None if len(upload_files) == 0 else upload_files[0]
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if return_value is not None and not isinstance(return_value, DeletedFile):
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enforce_filename_restriction(return_value.name, [".jpg"])
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return return_value
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class CameraInputMixin:
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@gather_metrics("camera_input")
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def camera_input(
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self,
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label: str,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*, # keyword-only arguments:
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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width: WidthWithoutContent = "stretch",
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) -> UploadedFile | None:
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r"""Display a widget that returns pictures from the user's webcam.
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Parameters
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----------
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label : str
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A short label explaining to the user what this widget is used for.
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The label can optionally contain GitHub-flavored Markdown of the
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following types: Bold, Italics, Strikethroughs, Inline Code, Links,
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and Images. Images display like icons, with a max height equal to
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the font height.
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Unsupported Markdown elements are unwrapped so only their children
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(text contents) render. Display unsupported elements as literal
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characters by backslash-escaping them. E.g.,
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``"1\. Not an ordered list"``.
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See the ``body`` parameter of |st.markdown|_ for additional,
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supported Markdown directives.
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For accessibility reasons, you should never set an empty label, but
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you can hide it with ``label_visibility`` if needed. In the future,
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we may disallow empty labels by raising an exception.
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.. |st.markdown| replace:: ``st.markdown``
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.. _st.markdown: https://docs.streamlit.io/develop/api-reference/text/st.markdown
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key : str or int
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An optional string or integer to use as the unique key for the widget.
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If this is omitted, a key will be generated for the widget
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based on its content. No two widgets may have the same key.
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help : str or None
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A tooltip that gets displayed next to the widget label. Streamlit
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only displays the tooltip when ``label_visibility="visible"``. If
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this is ``None`` (default), no tooltip is displayed.
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The tooltip can optionally contain GitHub-flavored Markdown,
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including the Markdown directives described in the ``body``
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parameter of ``st.markdown``.
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on_change : callable
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An optional callback invoked when this camera_input's value
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changes.
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args : tuple
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An optional tuple of args to pass to the callback.
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kwargs : dict
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An optional dict of kwargs to pass to the callback.
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disabled : bool
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An optional boolean that disables the camera input if set to
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``True``. Default is ``False``.
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label_visibility : "visible", "hidden", or "collapsed"
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The visibility of the label. The default is ``"visible"``. If this
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is ``"hidden"``, Streamlit displays an empty spacer instead of the
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label, which can help keep the widget aligned with other widgets.
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If this is ``"collapsed"``, Streamlit displays no label or spacer.
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width : "stretch" or int
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The width of the camera input widget. This can be one of the
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following:
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- ``"stretch"`` (default): The width of the widget matches the
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width of the parent container.
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- An integer specifying the width in pixels: The widget has a
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fixed width. If the specified width is greater than the width of
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the parent container, the width of the widget matches the width
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of the parent container.
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Returns
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-------
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None or UploadedFile
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The UploadedFile class is a subclass of BytesIO, and therefore is
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"file-like". This means you can pass an instance of it anywhere a
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file is expected.
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Examples
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--------
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>>> import streamlit as st
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>>>
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>>> enable = st.checkbox("Enable camera")
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>>> picture = st.camera_input("Take a picture", disabled=not enable)
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>>>
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>>> if picture:
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... st.image(picture)
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.. output::
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https://doc-camera-input.streamlit.app/
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height: 600px
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"""
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ctx = get_script_run_ctx()
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return self._camera_input(
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label=label,
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key=key,
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help=help,
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on_change=on_change,
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args=args,
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kwargs=kwargs,
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disabled=disabled,
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label_visibility=label_visibility,
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width=width,
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ctx=ctx,
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)
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def _camera_input(
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self,
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label: str,
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key: Key | None = None,
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help: str | None = None,
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on_change: WidgetCallback | None = None,
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args: WidgetArgs | None = None,
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kwargs: WidgetKwargs | None = None,
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*, # keyword-only arguments:
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disabled: bool = False,
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label_visibility: LabelVisibility = "visible",
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width: WidthWithoutContent = "stretch",
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ctx: ScriptRunContext | None = None,
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) -> UploadedFile | None:
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key = to_key(key)
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check_widget_policies(
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self.dg,
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key,
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on_change,
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default_value=None,
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writes_allowed=False,
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)
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maybe_raise_label_warnings(label, label_visibility)
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element_id = compute_and_register_element_id(
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"camera_input",
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user_key=key,
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form_id=current_form_id(self.dg),
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dg=self.dg,
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label=label,
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help=help,
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width=width,
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)
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camera_input_proto = CameraInputProto()
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camera_input_proto.id = element_id
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camera_input_proto.label = label
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camera_input_proto.form_id = current_form_id(self.dg)
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camera_input_proto.disabled = disabled
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camera_input_proto.label_visibility.value = get_label_visibility_proto_value(
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label_visibility
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)
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if help is not None:
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camera_input_proto.help = dedent(help)
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validate_width(width)
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layout_config = LayoutConfig(width=width)
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serde = CameraInputSerde()
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camera_input_state = register_widget(
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camera_input_proto.id,
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on_change_handler=on_change,
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args=args,
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kwargs=kwargs,
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deserializer=serde.deserialize,
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serializer=serde.serialize,
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ctx=ctx,
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value_type="file_uploader_state_value",
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)
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self.dg._enqueue(
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"camera_input", camera_input_proto, layout_config=layout_config
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)
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if isinstance(camera_input_state.value, DeletedFile):
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return None
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return camera_input_state.value
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@property
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def dg(self) -> DeltaGenerator:
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"""Get our DeltaGenerator."""
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return cast("DeltaGenerator", self)
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