File size: 2,297 Bytes
2c3c408 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | from __future__ import annotations
from fractions import Fraction
from typing import cast
from textual.geometry import Size, Region
from textual._layout import ArrangeResult, Layout, WidgetPlacement
from textual.widget import Widget
class HorizontalLayout(Layout):
"""Used to layout Widgets horizontally on screen, from left to right. Since Widgets naturally
fill the space of their parent container, all widgets used in a horizontal layout should have a specified.
"""
name = "horizontal"
def arrange(
self, parent: Widget, children: list[Widget], size: Size
) -> ArrangeResult:
placements: list[WidgetPlacement] = []
add_placement = placements.append
x = max_height = Fraction(0)
parent_size = parent.outer_size
styles = [child.styles for child in children if child.styles.width is not None]
total_fraction = sum(
[int(style.width.value) for style in styles if style.width.is_fraction]
)
fraction_unit = Fraction(size.width, total_fraction or 1)
box_models = [
widget._get_box_model(size, parent_size, fraction_unit)
for widget in cast("list[Widget]", children)
]
margins = [
max((box1.margin.right, box2.margin.left))
for box1, box2 in zip(box_models, box_models[1:])
]
if box_models:
margins.append(box_models[-1].margin.right)
x = Fraction(box_models[0].margin.left if box_models else 0)
displayed_children = [child for child in children if child.display]
_Region = Region
_WidgetPlacement = WidgetPlacement
for widget, box_model, margin in zip(children, box_models, margins):
content_width, content_height, box_margin = box_model
offset_y = box_margin.top
next_x = x + content_width
region = _Region(
int(x), offset_y, int(next_x - int(x)), int(content_height)
)
max_height = max(
max_height, content_height + offset_y + box_model.margin.bottom
)
add_placement(_WidgetPlacement(region, box_model.margin, widget, 0))
x = next_x + margin
return placements, set(displayed_children)
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