114 lines
3.6 KiB
Python
114 lines
3.6 KiB
Python
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import sys
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from typing import Optional, Tuple
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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 ._loop import loop_last
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from .console import Console, ConsoleOptions, RenderableType, RenderResult
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from .control import Control
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from .segment import ControlType, Segment
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from .style import StyleType
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from .text import Text
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VerticalOverflowMethod = Literal["crop", "ellipsis", "visible"]
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class LiveRender:
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"""Creates a renderable that may be updated.
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Args:
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renderable (RenderableType): Any renderable object.
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style (StyleType, optional): An optional style to apply to the renderable. Defaults to "".
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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: StyleType = "",
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vertical_overflow: VerticalOverflowMethod = "ellipsis",
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) -> None:
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self.renderable = renderable
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self.style = style
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self.vertical_overflow = vertical_overflow
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self._shape: Optional[Tuple[int, int]] = None
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def set_renderable(self, renderable: RenderableType) -> None:
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"""Set a new renderable.
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Args:
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renderable (RenderableType): Any renderable object, including str.
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"""
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self.renderable = renderable
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def position_cursor(self) -> Control:
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"""Get control codes to move cursor to beginning of live render.
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Returns:
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Control: A control instance that may be printed.
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"""
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if self._shape is not None:
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_, height = self._shape
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return Control(
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ControlType.CARRIAGE_RETURN,
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(ControlType.ERASE_IN_LINE, 2),
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*(
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(
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(ControlType.CURSOR_UP, 1),
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(ControlType.ERASE_IN_LINE, 2),
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)
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* (height - 1)
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)
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)
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return Control()
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def restore_cursor(self) -> Control:
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"""Get control codes to clear the render and restore the cursor to its previous position.
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Returns:
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Control: A Control instance that may be printed.
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"""
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if self._shape is not None:
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_, height = self._shape
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return Control(
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ControlType.CARRIAGE_RETURN,
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*((ControlType.CURSOR_UP, 1), (ControlType.ERASE_IN_LINE, 2)) * height
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)
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return Control()
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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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renderable = self.renderable
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style = console.get_style(self.style)
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lines = console.render_lines(renderable, options, style=style, pad=False)
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shape = Segment.get_shape(lines)
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_, height = shape
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if height > options.size.height:
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if self.vertical_overflow == "crop":
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lines = lines[: options.size.height]
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shape = Segment.get_shape(lines)
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elif self.vertical_overflow == "ellipsis":
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lines = lines[: (options.size.height - 1)]
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overflow_text = Text(
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"...",
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overflow="crop",
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justify="center",
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end="",
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style="live.ellipsis",
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)
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lines.append(list(console.render(overflow_text)))
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shape = Segment.get_shape(lines)
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self._shape = shape
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new_line = Segment.line()
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for last, line in loop_last(lines):
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yield from line
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if not last:
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yield new_line
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