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import sys
from typing import Optional, Tuple
if sys.version_info >= (3, 8):
from typing import Literal
else:
from typing_extensions import Literal # pragma: no cover
from ._loop import loop_last
from .console import Console, ConsoleOptions, RenderableType, RenderResult
from .control import Control
from .segment import ControlType, Segment
from .style import StyleType
from .text import Text
VerticalOverflowMethod = Literal["crop", "ellipsis", "visible"]
class LiveRender:
"""Creates a renderable that may be updated.
Args:
renderable (RenderableType): Any renderable object.
style (StyleType, optional): An optional style to apply to the renderable. Defaults to "".
"""
def __init__(
self,
renderable: RenderableType,
style: StyleType = "",
vertical_overflow: VerticalOverflowMethod = "ellipsis",
) -> None:
self.renderable = renderable
self.style = style
self.vertical_overflow = vertical_overflow
self._shape: Optional[Tuple[int, int]] = None
def set_renderable(self, renderable: RenderableType) -> None:
"""Set a new renderable.
Args:
renderable (RenderableType): Any renderable object, including str.
"""
self.renderable = renderable
def position_cursor(self) -> Control:
"""Get control codes to move cursor to beginning of live render.
Returns:
Control: A control instance that may be printed.
"""
if self._shape is not None:
_, height = self._shape
return Control(
ControlType.CARRIAGE_RETURN,
(ControlType.ERASE_IN_LINE, 2),
*(
(
(ControlType.CURSOR_UP, 1),
(ControlType.ERASE_IN_LINE, 2),
)
* (height - 1)
)
)
return Control()
def restore_cursor(self) -> Control:
"""Get control codes to clear the render and restore the cursor to its previous position.
Returns:
Control: A Control instance that may be printed.
"""
if self._shape is not None:
_, height = self._shape
return Control(
ControlType.CARRIAGE_RETURN,
*((ControlType.CURSOR_UP, 1), (ControlType.ERASE_IN_LINE, 2)) * height
)
return Control()
def __rich_console__(
self, console: Console, options: ConsoleOptions
) -> RenderResult:
renderable = self.renderable
style = console.get_style(self.style)
lines = console.render_lines(renderable, options, style=style, pad=False)
shape = Segment.get_shape(lines)
_, height = shape
if height > options.size.height:
if self.vertical_overflow == "crop":
lines = lines[: options.size.height]
shape = Segment.get_shape(lines)
elif self.vertical_overflow == "ellipsis":
lines = lines[: (options.size.height - 1)]
overflow_text = Text(
"...",
overflow="crop",
justify="center",
end="",
style="live.ellipsis",
)
lines.append(list(console.render(overflow_text)))
shape = Segment.get_shape(lines)
self._shape = shape
new_line = Segment.line()
for last, line in loop_last(lines):
yield from line
if not last:
yield new_line