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Viewing File: progress_bar.py
import math
from functools import lru_cache
from time import monotonic
from typing import Iterable, List, Optional
from .color import Color, blend_rgb
from .color_triplet import ColorTriplet
from .console import Console, ConsoleOptions, RenderResult
from .jupyter import JupyterMixin
from .measure import Measurement
from .segment import Segment
from .style import Style, StyleType
# Number of characters before 'pulse' animation repeats
PULSE_SIZE = 20
class ProgressBar(JupyterMixin):
"""Renders a (progress) bar. Used by rich.progress.
Args:
total (float, optional): Number of steps in the bar. Defaults to 100. Set to None to render a pulsing animation.
completed (float, optional): Number of steps completed. Defaults to 0.
width (int, optional): Width of the bar, or ``None`` for maximum width. Defaults to None.
pulse (bool, optional): Enable pulse effect. Defaults to False. Will pulse if a None total was passed.
style (StyleType, optional): Style for the bar background. Defaults to "bar.back".
complete_style (StyleType, optional): Style for the completed bar. Defaults to "bar.complete".
finished_style (StyleType, optional): Style for a finished bar. Defaults to "bar.finished".
pulse_style (StyleType, optional): Style for pulsing bars. Defaults to "bar.pulse".
animation_time (Optional[float], optional): Time in seconds to use for animation, or None to use system time.
"""
def __init__(
self,
total: Optional[float] = 100.0,
completed: float = 0,
width: Optional[int] = None,
pulse: bool = False,
style: StyleType = "bar.back",
complete_style: StyleType = "bar.complete",
finished_style: StyleType = "bar.finished",
pulse_style: StyleType = "bar.pulse",
animation_time: Optional[float] = None,
):
self.total = total
self.completed = completed
self.width = width
self.pulse = pulse
self.style = style
self.complete_style = complete_style
self.finished_style = finished_style
self.pulse_style = pulse_style
self.animation_time = animation_time
self._pulse_segments: Optional[List[Segment]] = None
def __repr__(self) -> str:
return f"<Bar {self.completed!r} of {self.total!r}>"
@property
def percentage_completed(self) -> Optional[float]:
"""Calculate percentage complete."""
if self.total is None:
return None
completed = (self.completed / self.total) * 100.0
completed = min(100, max(0.0, completed))
return completed
@lru_cache(maxsize=16)
def _get_pulse_segments(
self,
fore_style: Style,
back_style: Style,
color_system: str,
no_color: bool,
ascii: bool = False,
) -> List[Segment]:
"""Get a list of segments to render a pulse animation.
Returns:
List[Segment]: A list of segments, one segment per character.
"""
bar = "-" if ascii else "━"
segments: List[Segment] = []
if color_system not in ("standard", "eight_bit", "truecolor") or no_color:
segments += [Segment(bar, fore_style)] * (PULSE_SIZE // 2)
segments += [Segment(" " if no_color else bar, back_style)] * (
PULSE_SIZE - (PULSE_SIZE // 2)
)
return segments
append = segments.append
fore_color = (
fore_style.color.get_truecolor()
if fore_style.color
else ColorTriplet(255, 0, 255)
)
back_color = (
back_style.color.get_truecolor()
if back_style.color
else ColorTriplet(0, 0, 0)
)
cos = math.cos
pi = math.pi
_Segment = Segment
_Style = Style
from_triplet = Color.from_triplet
for index in range(PULSE_SIZE):
position = index / PULSE_SIZE
fade = 0.5 + cos(position * pi * 2) / 2.0
color = blend_rgb(fore_color, back_color, cross_fade=fade)
append(_Segment(bar, _Style(color=from_triplet(color))))
return segments
def update(self, completed: float, total: Optional[float] = None) -> None:
"""Update progress with new values.
Args:
completed (float): Number of steps completed.
total (float, optional): Total number of steps, or ``None`` to not change. Defaults to None.
"""
self.completed = completed
self.total = total if total is not None else self.total
def _render_pulse(
self, console: Console, width: int, ascii: bool = False
) -> Iterable[Segment]:
"""Renders the pulse animation.
Args:
console (Console): Console instance.
width (int): Width in characters of pulse animation.
Returns:
RenderResult: [description]
Yields:
Iterator[Segment]: Segments to render pulse
"""
fore_style = console.get_style(self.pulse_style, default="white")
back_style = console.get_style(self.style, default="black")
pulse_segments = self._get_pulse_segments(
fore_style, back_style, console.color_system, console.no_color, ascii=ascii
)
segment_count = len(pulse_segments)
current_time = (
monotonic() if self.animation_time is None else self.animation_time
)
segments = pulse_segments * (int(width / segment_count) + 2)
offset = int(-current_time * 15) % segment_count
segments = segments[offset : offset + width]
yield from segments
def __rich_console__(
self, console: Console, options: ConsoleOptions
) -> RenderResult:
width = min(self.width or options.max_width, options.max_width)
ascii = options.legacy_windows or options.ascii_only
should_pulse = self.pulse or self.total is None
if should_pulse:
yield from self._render_pulse(console, width, ascii=ascii)
return
completed: Optional[float] = (
min(self.total, max(0, self.completed)) if self.total is not None else None
)
bar = "-" if ascii else "━"
half_bar_right = " " if ascii else "╸"
half_bar_left = " " if ascii else "╺"
complete_halves = (
int(width * 2 * completed / self.total)
if self.total and completed is not None
else width * 2
)
bar_count = complete_halves // 2
half_bar_count = complete_halves % 2
style = console.get_style(self.style)
is_finished = self.total is None or self.completed >= self.total
complete_style = console.get_style(
self.finished_style if is_finished else self.complete_style
)
_Segment = Segment
if bar_count:
yield _Segment(bar * bar_count, complete_style)
if half_bar_count:
yield _Segment(half_bar_right * half_bar_count, complete_style)
if not console.no_color:
remaining_bars = width - bar_count - half_bar_count
if remaining_bars and console.color_system is not None:
if not half_bar_count and bar_count:
yield _Segment(half_bar_left, style)
remaining_bars -= 1
if remaining_bars:
yield _Segment(bar * remaining_bars, style)
def __rich_measure__(
self, console: Console, options: ConsoleOptions
) -> Measurement:
return (
Measurement(self.width, self.width)
if self.width is not None
else Measurement(4, options.max_width)
)
if __name__ == "__main__": # pragma: no cover
console = Console()
bar = ProgressBar(width=50, total=100)
import time
console.show_cursor(False)
for n in range(0, 101, 1):
bar.update(n)
console.print(bar)
console.file.write("\r")
time.sleep(0.05)
console.show_cursor(True)
console.print()
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