470 lines
16 KiB
Python
470 lines
16 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 dataclasses import dataclass
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from datetime import datetime, date, time
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from textwrap import dedent
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from typing import Any, cast, List, Optional, Sequence, Tuple, TYPE_CHECKING, Union
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from dateutil import relativedelta
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from typing_extensions import TypeAlias
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from streamlit.runtime.scriptrunner import ScriptRunContext, get_script_run_ctx
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from streamlit.type_util import Key, to_key
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from streamlit.errors import StreamlitAPIException
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from streamlit.proto.DateInput_pb2 import DateInput as DateInputProto
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from streamlit.proto.TimeInput_pb2 import TimeInput as TimeInputProto
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from streamlit.runtime.state import (
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register_widget,
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WidgetArgs,
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WidgetCallback,
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WidgetKwargs,
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)
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from .form import current_form_id
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from .utils import check_callback_rules, check_session_state_rules
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if TYPE_CHECKING:
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from streamlit.delta_generator import DeltaGenerator
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TimeValue: TypeAlias = Union[time, datetime, None]
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SingleDateValue: TypeAlias = Union[date, datetime, None]
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DateValue: TypeAlias = Union[SingleDateValue, Sequence[SingleDateValue]]
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DateWidgetReturn: TypeAlias = Union[date, Tuple[()], Tuple[date], Tuple[date, date]]
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def _parse_date_value(value: DateValue) -> Tuple[List[date], bool]:
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parsed_dates: List[date]
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range_value: bool = False
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if value is None:
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# Set value default.
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parsed_dates = [datetime.now().date()]
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elif isinstance(value, datetime):
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parsed_dates = [value.date()]
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elif isinstance(value, date):
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parsed_dates = [value]
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elif isinstance(value, (list, tuple)):
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if not len(value) in (0, 1, 2):
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raise StreamlitAPIException(
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"DateInput value should either be an date/datetime or a list/tuple of "
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"0 - 2 date/datetime values"
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)
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parsed_dates = [v.date() if isinstance(v, datetime) else v for v in value]
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range_value = True
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else:
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raise StreamlitAPIException(
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"DateInput value should either be an date/datetime or a list/tuple of "
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"0 - 2 date/datetime values"
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)
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return parsed_dates, range_value
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def _parse_min_date(
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min_value: SingleDateValue,
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parsed_dates: Sequence[date],
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) -> date:
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parsed_min_date: date
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if isinstance(min_value, datetime):
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parsed_min_date = min_value.date()
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elif isinstance(min_value, date):
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parsed_min_date = min_value
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elif min_value is None:
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if parsed_dates:
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parsed_min_date = parsed_dates[0] - relativedelta.relativedelta(years=10)
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else:
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parsed_min_date = date.today() - relativedelta.relativedelta(years=10)
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else:
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raise StreamlitAPIException(
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"DateInput min should either be a date/datetime or None"
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)
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return parsed_min_date
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def _parse_max_date(
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max_value: SingleDateValue,
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parsed_dates: Sequence[date],
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) -> date:
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parsed_max_date: date
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if isinstance(max_value, datetime):
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parsed_max_date = max_value.date()
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elif isinstance(max_value, date):
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parsed_max_date = max_value
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elif max_value is None:
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if parsed_dates:
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parsed_max_date = parsed_dates[-1] + relativedelta.relativedelta(years=10)
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else:
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parsed_max_date = date.today() + relativedelta.relativedelta(years=10)
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else:
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raise StreamlitAPIException(
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"DateInput max should either be a date/datetime or None"
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)
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return parsed_max_date
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@dataclass(frozen=True)
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class _DateInputValues:
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value: Sequence[date]
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is_range: bool
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max: date
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min: date
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@classmethod
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def from_raw_values(
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cls,
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value: DateValue,
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min_value: SingleDateValue,
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max_value: SingleDateValue,
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) -> "_DateInputValues":
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parsed_value, is_range = _parse_date_value(value=value)
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return cls(
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value=parsed_value,
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is_range=is_range,
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min=_parse_min_date(
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min_value=min_value,
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parsed_dates=parsed_value,
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),
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max=_parse_max_date(
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max_value=max_value,
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parsed_dates=parsed_value,
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),
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)
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def __post_init__(self) -> None:
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if self.min > self.max:
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raise StreamlitAPIException(
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f"The `min_value`, set to {self.min}, shouldn't be larger "
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f"than the `max_value`, set to {self.max}."
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)
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if self.value:
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start_value = self.value[0]
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end_value = self.value[-1]
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if (start_value < self.min) or (end_value > self.max):
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raise StreamlitAPIException(
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f"The default `value` of {self.value} "
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f"must lie between the `min_value` of {self.min} "
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f"and the `max_value` of {self.max}, inclusively."
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)
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class TimeWidgetsMixin:
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def time_input(
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self,
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label: str,
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value: TimeValue = None,
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key: Optional[Key] = None,
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help: Optional[str] = None,
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on_change: Optional[WidgetCallback] = None,
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args: Optional[WidgetArgs] = None,
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kwargs: Optional[WidgetKwargs] = None,
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*, # keyword-only arguments:
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disabled: bool = False,
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) -> time:
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"""Display a time input widget.
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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 time input is for.
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value : datetime.time/datetime.datetime
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The value of this widget when it first renders. This will be
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cast to str internally. Defaults to the current time.
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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. Multiple widgets of the same type may
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not share the same key.
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help : str
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An optional tooltip that gets displayed next to the input.
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on_change : callable
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An optional callback invoked when this time_input's value 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, which disables the time input if set to True.
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The default is False. This argument can only be supplied by keyword.
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Returns
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-------
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datetime.time
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The current value of the time input widget.
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Example
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-------
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>>> t = st.time_input('Set an alarm for', datetime.time(8, 45))
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>>> st.write('Alarm is set for', t)
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.. output::
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https://doc-time-input.streamlitapp.com/
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height: 260px
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"""
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ctx = get_script_run_ctx()
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return self._time_input(
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label=label,
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value=value,
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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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ctx=ctx,
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)
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def _time_input(
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self,
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label: str,
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value: Union[time, datetime, None] = None,
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key: Optional[Key] = None,
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help: Optional[str] = None,
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on_change: Optional[WidgetCallback] = None,
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args: Optional[WidgetArgs] = None,
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kwargs: Optional[WidgetKwargs] = None,
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*, # keyword-only arguments:
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disabled: bool = False,
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ctx: Optional[ScriptRunContext] = None,
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) -> time:
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key = to_key(key)
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check_callback_rules(self.dg, on_change)
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check_session_state_rules(default_value=value, key=key)
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parsed_time: time
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if value is None:
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# Set value default.
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parsed_time = datetime.now().time().replace(second=0, microsecond=0)
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elif isinstance(value, datetime):
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parsed_time = value.time().replace(second=0, microsecond=0)
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elif isinstance(value, time):
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parsed_time = value
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else:
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raise StreamlitAPIException(
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"The type of value should be one of datetime, time or None"
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)
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del value
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time_input_proto = TimeInputProto()
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time_input_proto.label = label
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time_input_proto.default = time.strftime(parsed_time, "%H:%M")
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time_input_proto.form_id = current_form_id(self.dg)
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if help is not None:
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time_input_proto.help = dedent(help)
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def deserialize_time_input(
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ui_value: Optional[str], widget_id: Any = ""
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) -> time:
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return (
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datetime.strptime(ui_value, "%H:%M").time()
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if ui_value is not None
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else parsed_time
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)
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def serialize_time_input(v: Union[datetime, time]) -> str:
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if isinstance(v, datetime):
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v = v.time()
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return time.strftime(v, "%H:%M")
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widget_state = register_widget(
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"time_input",
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time_input_proto,
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user_key=key,
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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=deserialize_time_input,
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serializer=serialize_time_input,
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ctx=ctx,
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)
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# This needs to be done after register_widget because we don't want
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# the following proto fields to affect a widget's ID.
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time_input_proto.disabled = disabled
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if widget_state.value_changed:
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time_input_proto.value = serialize_time_input(widget_state.value)
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time_input_proto.set_value = True
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self.dg._enqueue("time_input", time_input_proto)
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return widget_state.value
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def date_input(
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self,
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label: str,
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value: DateValue = None,
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min_value: SingleDateValue = None,
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max_value: SingleDateValue = None,
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key: Optional[Key] = None,
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help: Optional[str] = None,
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on_change: Optional[WidgetCallback] = None,
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args: Optional[WidgetArgs] = None,
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kwargs: Optional[WidgetKwargs] = None,
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*, # keyword-only arguments:
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disabled: bool = False,
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) -> DateWidgetReturn:
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"""Display a date input widget.
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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 date input is for.
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value : datetime.date or datetime.datetime or list/tuple of datetime.date or datetime.datetime or None
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The value of this widget when it first renders. If a list/tuple with
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0 to 2 date/datetime values is provided, the datepicker will allow
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users to provide a range. Defaults to today as a single-date picker.
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min_value : datetime.date or datetime.datetime
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The minimum selectable date. If value is a date, defaults to value - 10 years.
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If value is the interval [start, end], defaults to start - 10 years.
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max_value : datetime.date or datetime.datetime
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The maximum selectable date. If value is a date, defaults to value + 10 years.
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If value is the interval [start, end], defaults to end + 10 years.
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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. Multiple widgets of the same type may
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not share the same key.
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help : str
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An optional tooltip that gets displayed next to the input.
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on_change : callable
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An optional callback invoked when this date_input's value 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, which disables the date input if set to True.
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The default is False. This argument can only be supplied by keyword.
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Returns
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-------
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datetime.date or a tuple with 0-2 dates
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The current value of the date input widget.
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Example
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-------
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>>> d = st.date_input(
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... "When\'s your birthday",
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... datetime.date(2019, 7, 6))
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>>> st.write('Your birthday is:', d)
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.. output::
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https://doc-date-input.streamlitapp.com/
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height: 260px
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"""
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ctx = get_script_run_ctx()
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return self._date_input(
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label=label,
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value=value,
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min_value=min_value,
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max_value=max_value,
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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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ctx=ctx,
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)
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def _date_input(
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self,
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label: str,
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value: DateValue = None,
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min_value: SingleDateValue = None,
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max_value: SingleDateValue = None,
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key: Optional[Key] = None,
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help: Optional[str] = None,
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on_change: Optional[WidgetCallback] = None,
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args: Optional[WidgetArgs] = None,
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kwargs: Optional[WidgetKwargs] = None,
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*, # keyword-only arguments:
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disabled: bool = False,
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ctx: Optional[ScriptRunContext] = None,
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) -> DateWidgetReturn:
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key = to_key(key)
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check_callback_rules(self.dg, on_change)
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check_session_state_rules(default_value=value, key=key)
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parsed_values = _DateInputValues.from_raw_values(
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value=value,
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min_value=min_value,
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max_value=max_value,
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)
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del value, min_value, max_value
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date_input_proto = DateInputProto()
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date_input_proto.is_range = parsed_values.is_range
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if help is not None:
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date_input_proto.help = dedent(help)
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date_input_proto.label = label
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date_input_proto.default[:] = [
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date.strftime(v, "%Y/%m/%d") for v in parsed_values.value
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]
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date_input_proto.min = date.strftime(parsed_values.min, "%Y/%m/%d")
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date_input_proto.max = date.strftime(parsed_values.max, "%Y/%m/%d")
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date_input_proto.form_id = current_form_id(self.dg)
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def deserialize_date_input(
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ui_value: Any,
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widget_id: str = "",
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) -> DateWidgetReturn:
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return_value: Sequence[date]
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if ui_value is not None:
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return_value = tuple(
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datetime.strptime(v, "%Y/%m/%d").date() for v in ui_value
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)
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else:
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return_value = parsed_values.value
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if not parsed_values.is_range:
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return return_value[0]
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return cast(DateWidgetReturn, tuple(return_value))
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def serialize_date_input(v: DateWidgetReturn) -> List[str]:
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to_serialize = list(v) if isinstance(v, (list, tuple)) else [v]
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return [date.strftime(v, "%Y/%m/%d") for v in to_serialize]
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widget_state = register_widget(
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"date_input",
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date_input_proto,
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user_key=key,
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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=deserialize_date_input,
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serializer=serialize_date_input,
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ctx=ctx,
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)
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# This needs to be done after register_widget because we don't want
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# the following proto fields to affect a widget's ID.
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date_input_proto.disabled = disabled
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if widget_state.value_changed:
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date_input_proto.value[:] = serialize_date_input(widget_state.value)
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date_input_proto.set_value = True
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self.dg._enqueue("date_input", date_input_proto)
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return widget_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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