7ec4b3f8fe
* Update component docstrings * Remove transitions libs * Add span component * Add lock files
76 lines
2.0 KiB
Python
76 lines
2.0 KiB
Python
"""Create a list of components from an iterable."""
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from __future__ import annotations
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from typing import Optional
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import pydantic
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from pynecone.components.component import Component
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from pynecone.components.layout.box import Box
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from pynecone.components.tags import CondTag, Tag
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from pynecone.var import Var
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class Cond(Component):
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"""Render one of two components based on a condition."""
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# The cond to determine which component to render.
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cond: Var[bool]
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# The component to render if the cond is true.
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comp1: Component
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# The component to render if the cond is false.
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comp2: Component
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# Whether the cond is within another cond.
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is_nested: bool = False
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@pydantic.validator("cond")
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def validate_cond(cls, cond: Var) -> Var:
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"""Validate that the cond is a boolean.
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Args:
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cond: The cond to validate.
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Returns:
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The validated cond.
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"""
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assert issubclass(cond.type_, bool), "The var must be a boolean."
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return cond
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@classmethod
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def create(
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cls, cond: Var, comp1: Component, comp2: Optional[Component] = None
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) -> Cond:
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"""Create a conditional component.
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Args:
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cond: The cond to determine which component to render.
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comp1: The component to render if the cond is true.
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comp2: The component to render if the cond is false.
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Returns:
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The conditional component.
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"""
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if comp2 is None:
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comp2 = Box.create()
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if isinstance(comp1, Cond):
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comp1.is_nested = True
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if isinstance(comp2, Cond):
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comp2.is_nested = True
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return cls(
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cond=cond,
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comp1=comp1,
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comp2=comp2,
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children=[comp1, comp2],
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) # type: ignore
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def _render(self) -> Tag:
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return CondTag(
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cond=self.cond,
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true_value=self.comp1.render(),
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false_value=self.comp2.render(),
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is_nested=self.is_nested,
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)
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