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from fractions import Fraction
import pytest
from textual._resolve import resolve, resolve_fraction_unit
from textual.css.scalar import Scalar
from textual.geometry import Size
from textual.widget import Widget
def test_resolve_empty():
assert resolve([], 10, 1, Size(20, 10), Size(80, 24)) == []
@pytest.mark.parametrize(
"scalars,total,gutter,result",
[
(["10"], 100, 0, [(0, 10)]),
(
["10", "20"],
100,
0,
[(0, 10), (10, 20)],
),
(
["10", "20"],
100,
1,
[(0, 10), (11, 20)],
),
(
["10", "1fr"],
100,
1,
[(0, 10), (11, 89)],
),
(
["1fr", "1fr"],
100,
0,
[(0, 50), (50, 50)],
),
(
["3", "1fr", "1fr", "1"],
100,
1,
[(0, 3), (4, 46), (51, 47), (99, 1)],
),
],
)
def test_resolve(scalars, total, gutter, result):
assert (
resolve(
[Scalar.parse(scalar) for scalar in scalars],
total,
gutter,
Size(40, 20),
Size(80, 24),
)
== result
)
def test_resolve_fraction_unit():
"""Test resolving fraction units in combination with minimum widths."""
widget1 = Widget()
widget2 = Widget()
widget3 = Widget()
widget1.styles.width = "1fr"
widget1.styles.min_width = 20
widget2.styles.width = "2fr"
widget2.styles.min_width = 10
widget3.styles.width = "1fr"
styles = (widget1.styles, widget2.styles, widget3.styles)
# Try with width 80.
# Fraction unit should one fourth of width
assert resolve_fraction_unit(
styles,
Size(80, 24),
Size(80, 24),
Fraction(80),
resolve_dimension="width",
) == Fraction(20)
# Try with width 50
# First widget is fixed at 20
# Remaining three widgets have 30 to play with
# Fraction is 10
assert resolve_fraction_unit(
styles,
Size(80, 24),
Size(80, 24),
Fraction(50),
resolve_dimension="width",
) == Fraction(10)
# Try with width 35
# First widget fixed at 20
# Fraction is 5
assert resolve_fraction_unit(
styles,
Size(80, 24),
Size(80, 24),
Fraction(35),
resolve_dimension="width",
) == Fraction(5)
# Try with width 32
# First widget fixed at 20
# Second widget is fixed at 10
# Remaining widget has all the space
# Fraction is 2
assert resolve_fraction_unit(
styles,
Size(80, 24),
Size(80, 24),
Fraction(32),
resolve_dimension="width",
) == Fraction(2)
def test_resolve_fraction_unit_stress_test():
"""Check for zero division errors."""
# https://github.com/Textualize/textual/issues/2673
widget = Widget()
styles = widget.styles
styles.width = "1fr"
# We're mainly checking for the absence of zero division errors,
# which is a reoccurring theme for this code.
for remaining_space in range(1, 51, 10):
for max_width in range(1, remaining_space):
styles.max_width = max_width
for width in range(1, remaining_space, 2):
size = Size(width, 24)
resolved_unit = resolve_fraction_unit(
[styles, styles, styles],
size,
size,
Fraction(remaining_space),
"width",
)
assert resolved_unit <= remaining_space
def test_resolve_issue_2502():
"""Test https://github.com/Textualize/textual/issues/2502"""
widget = Widget()
widget.styles.width = "1fr"
widget.styles.min_width = 11
assert isinstance(
resolve_fraction_unit(
(widget.styles,),
Size(80, 24),
Size(80, 24),
Fraction(10),
resolve_dimension="width",
),
Fraction,
)
|
