312 lines
10 KiB
Python
312 lines
10 KiB
Python
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import sys
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from itertools import chain
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from typing import TYPE_CHECKING, Iterable, Optional
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if sys.version_info >= (3, 8):
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from typing import Literal
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else:
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from typing_extensions import Literal # pragma: no cover
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from .constrain import Constrain
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from .jupyter import JupyterMixin
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from .measure import Measurement
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from .segment import Segment
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from .style import StyleType
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if TYPE_CHECKING:
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from .console import Console, ConsoleOptions, RenderableType, RenderResult
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AlignMethod = Literal["left", "center", "right"]
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VerticalAlignMethod = Literal["top", "middle", "bottom"]
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class Align(JupyterMixin):
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"""Align a renderable by adding spaces if necessary.
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Args:
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renderable (RenderableType): A console renderable.
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align (AlignMethod): One of "left", "center", or "right""
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style (StyleType, optional): An optional style to apply to the background.
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vertical (Optional[VerticalAlignMethod], optional): Optional vertical align, one of "top", "middle", or "bottom". Defaults to None.
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pad (bool, optional): Pad the right with spaces. Defaults to True.
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width (int, optional): Restrict contents to given width, or None to use default width. Defaults to None.
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height (int, optional): Set height of align renderable, or None to fit to contents. Defaults to None.
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Raises:
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ValueError: if ``align`` is not one of the expected values.
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"""
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def __init__(
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self,
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renderable: "RenderableType",
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align: AlignMethod = "left",
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style: Optional[StyleType] = None,
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*,
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vertical: Optional[VerticalAlignMethod] = None,
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pad: bool = True,
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width: Optional[int] = None,
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height: Optional[int] = None,
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) -> None:
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if align not in ("left", "center", "right"):
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raise ValueError(
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f'invalid value for align, expected "left", "center", or "right" (not {align!r})'
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)
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if vertical is not None and vertical not in ("top", "middle", "bottom"):
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raise ValueError(
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f'invalid value for vertical, expected "top", "middle", or "bottom" (not {vertical!r})'
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)
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self.renderable = renderable
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self.align = align
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self.style = style
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self.vertical = vertical
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self.pad = pad
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self.width = width
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self.height = height
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def __repr__(self) -> str:
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return f"Align({self.renderable!r}, {self.align!r})"
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@classmethod
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def left(
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cls,
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renderable: "RenderableType",
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style: Optional[StyleType] = None,
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*,
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vertical: Optional[VerticalAlignMethod] = None,
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pad: bool = True,
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width: Optional[int] = None,
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height: Optional[int] = None,
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) -> "Align":
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"""Align a renderable to the left."""
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return cls(
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renderable,
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"left",
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style=style,
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vertical=vertical,
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pad=pad,
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width=width,
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height=height,
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)
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@classmethod
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def center(
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cls,
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renderable: "RenderableType",
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style: Optional[StyleType] = None,
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*,
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vertical: Optional[VerticalAlignMethod] = None,
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pad: bool = True,
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width: Optional[int] = None,
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height: Optional[int] = None,
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) -> "Align":
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"""Align a renderable to the center."""
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return cls(
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renderable,
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"center",
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style=style,
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vertical=vertical,
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pad=pad,
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width=width,
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height=height,
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)
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@classmethod
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def right(
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cls,
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renderable: "RenderableType",
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style: Optional[StyleType] = None,
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*,
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vertical: Optional[VerticalAlignMethod] = None,
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pad: bool = True,
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width: Optional[int] = None,
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height: Optional[int] = None,
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) -> "Align":
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"""Align a renderable to the right."""
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return cls(
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renderable,
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"right",
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style=style,
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vertical=vertical,
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pad=pad,
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width=width,
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height=height,
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)
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def __rich_console__(
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self, console: "Console", options: "ConsoleOptions"
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) -> "RenderResult":
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align = self.align
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width = console.measure(self.renderable, options=options).maximum
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rendered = console.render(
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Constrain(
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self.renderable, width if self.width is None else min(width, self.width)
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),
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options.update(height=None),
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)
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lines = list(Segment.split_lines(rendered))
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width, height = Segment.get_shape(lines)
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lines = Segment.set_shape(lines, width, height)
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new_line = Segment.line()
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excess_space = options.max_width - width
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style = console.get_style(self.style) if self.style is not None else None
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def generate_segments() -> Iterable[Segment]:
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if excess_space <= 0:
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# Exact fit
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for line in lines:
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yield from line
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yield new_line
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elif align == "left":
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# Pad on the right
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pad = Segment(" " * excess_space, style) if self.pad else None
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for line in lines:
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yield from line
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if pad:
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yield pad
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yield new_line
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elif align == "center":
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# Pad left and right
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left = excess_space // 2
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pad = Segment(" " * left, style)
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pad_right = (
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Segment(" " * (excess_space - left), style) if self.pad else None
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)
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for line in lines:
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if left:
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yield pad
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yield from line
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if pad_right:
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yield pad_right
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yield new_line
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elif align == "right":
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# Padding on left
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pad = Segment(" " * excess_space, style)
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for line in lines:
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yield pad
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yield from line
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yield new_line
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blank_line = (
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Segment(f"{' ' * (self.width or options.max_width)}\n", style)
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if self.pad
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else Segment("\n")
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)
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def blank_lines(count: int) -> Iterable[Segment]:
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if count > 0:
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for _ in range(count):
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yield blank_line
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vertical_height = self.height or options.height
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iter_segments: Iterable[Segment]
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if self.vertical and vertical_height is not None:
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if self.vertical == "top":
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bottom_space = vertical_height - height
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iter_segments = chain(generate_segments(), blank_lines(bottom_space))
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elif self.vertical == "middle":
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top_space = (vertical_height - height) // 2
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bottom_space = vertical_height - top_space - height
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iter_segments = chain(
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blank_lines(top_space),
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generate_segments(),
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blank_lines(bottom_space),
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)
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else: # self.vertical == "bottom":
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top_space = vertical_height - height
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iter_segments = chain(blank_lines(top_space), generate_segments())
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else:
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iter_segments = generate_segments()
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if self.style:
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style = console.get_style(self.style)
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iter_segments = Segment.apply_style(iter_segments, style)
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yield from iter_segments
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def __rich_measure__(
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self, console: "Console", options: "ConsoleOptions"
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) -> Measurement:
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measurement = Measurement.get(console, options, self.renderable)
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return measurement
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class VerticalCenter(JupyterMixin):
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"""Vertically aligns a renderable.
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Warn:
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This class is deprecated and may be removed in a future version. Use Align class with
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`vertical="middle"`.
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Args:
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renderable (RenderableType): A renderable object.
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"""
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def __init__(
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self,
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renderable: "RenderableType",
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style: Optional[StyleType] = None,
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) -> None:
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self.renderable = renderable
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self.style = style
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def __repr__(self) -> str:
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return f"VerticalCenter({self.renderable!r})"
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def __rich_console__(
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self, console: "Console", options: "ConsoleOptions"
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) -> "RenderResult":
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style = console.get_style(self.style) if self.style is not None else None
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lines = console.render_lines(
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self.renderable, options.update(height=None), pad=False
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)
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width, _height = Segment.get_shape(lines)
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new_line = Segment.line()
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height = options.height or options.size.height
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top_space = (height - len(lines)) // 2
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bottom_space = height - top_space - len(lines)
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blank_line = Segment(f"{' ' * width}", style)
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def blank_lines(count: int) -> Iterable[Segment]:
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for _ in range(count):
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yield blank_line
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yield new_line
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if top_space > 0:
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yield from blank_lines(top_space)
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for line in lines:
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yield from line
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yield new_line
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if bottom_space > 0:
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yield from blank_lines(bottom_space)
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def __rich_measure__(
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self, console: "Console", options: "ConsoleOptions"
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) -> Measurement:
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measurement = Measurement.get(console, options, self.renderable)
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return measurement
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if __name__ == "__main__": # pragma: no cover
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from rich.console import Console, Group
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from rich.highlighter import ReprHighlighter
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from rich.panel import Panel
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highlighter = ReprHighlighter()
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console = Console()
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panel = Panel(
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Group(
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Align.left(highlighter("align='left'")),
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Align.center(highlighter("align='center'")),
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Align.right(highlighter("align='right'")),
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),
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width=60,
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style="on dark_blue",
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title="Align",
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)
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console.print(
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Align.center(panel, vertical="middle", style="on red", height=console.height)
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)
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