optimize horizontal and vertical (#2234)

* optimize horizontal and vertical

* generator to list expressions

* micro op

* another micro-optimization

src/textual/_resolve.py

@@ -44,12 +44,12 @@ def resolve(
 
     from_float = Fraction.from_float
     total_fraction = from_float(
-        sum(scalar.value for scalar, fraction in resolved if fraction is None)
+        sum([scalar.value for scalar, fraction in resolved if fraction is None])
     )
 
     if total_fraction:
         total_gutter = gutter * (len(dimensions) - 1)
-        consumed = sum(fraction for _, fraction in resolved if fraction is not None)
+        consumed = sum([fraction for _, fraction in resolved if fraction is not None])
         remaining = max(Fraction(0), Fraction(total - total_gutter) - consumed)
         fraction_unit = Fraction(remaining, total_fraction)
         resolved_fractions = [
@@ -118,23 +118,21 @@ def resolve_box_models(
     ]
 
     if dimension == "width":
-        total_remaining = sum(
-            box_model.width for box_model in box_models if box_model is not None
-        )
+        total_remaining = sum([width for width, _, _ in filter(None, box_models)])
         remaining_space = max(0, size.width - total_remaining - margin_width)
     else:
-        total_remaining = sum(
-            box_model.height for box_model in box_models if box_model is not None
-        )
+        total_remaining = sum([height for _, height, _ in filter(None, box_models)])
         remaining_space = max(0, size.height - total_remaining - margin_height)
 
     fraction_unit = Fraction(
         remaining_space,
         int(
             sum(
-                dimension.value
-                for dimension in dimensions
-                if dimension and dimension.is_fraction
+                [
+                    dimension.value
+                    for dimension in dimensions
+                    if dimension and dimension.is_fraction
+                ]
             )
         )
         or 1,

src/textual/layouts/horizontal.py

@@ -1,11 +1,15 @@
 from __future__ import annotations
 
 from fractions import Fraction
+from typing import TYPE_CHECKING
 
 from .._layout import ArrangeResult, Layout, WidgetPlacement
 from .._resolve import resolve_box_models
 from ..geometry import Region, Size
-from ..widget import Widget
+
+if TYPE_CHECKING:
+    from ..geometry import Spacing
+    from ..widget import Widget
 
 
 class HorizontalLayout(Layout):
@@ -24,17 +28,22 @@ class HorizontalLayout(Layout):
         parent_size = parent.outer_size
 
         child_styles = [child.styles for child in children]
-        box_margins = [styles.margin for styles in child_styles]
+        box_margins: list[Spacing] = [styles.margin for styles in child_styles]
         if box_margins:
             resolve_margin = Size(
-                (
-                    sum(
-                        max(margin1.right, margin2.left)
+                sum(
+                    [
+                        max(margin1[1], margin2[3])
                         for margin1, margin2 in zip(box_margins, box_margins[1:])
-                    )
-                    + (box_margins[0].left + box_margins[-1].right)
+                    ]
+                )
+                + (box_margins[0].left + box_margins[-1].right),
+                max(
+                    [
+                        margin_top + margin_bottom
+                        for margin_top, _, margin_bottom, _ in box_margins
+                    ]
                 ),
-                max(margin.height for margin in box_margins),
             )
         else:
             resolve_margin = Size(0, 0)

src/textual/layouts/vertical.py

@@ -8,6 +8,7 @@ from .._resolve import resolve_box_models
 from ..geometry import Region, Size
 
 if TYPE_CHECKING:
+    from ..geometry import Spacing
     from ..widget import Widget
 
 
@@ -24,17 +25,22 @@ class VerticalLayout(Layout):
         parent_size = parent.outer_size
 
         child_styles = [child.styles for child in children]
-        box_margins = [styles.margin for styles in child_styles]
+        box_margins: list[Spacing] = [styles.margin for styles in child_styles]
         if box_margins:
             resolve_margin = Size(
-                max([margin.width for margin in box_margins]),
-                (
-                    sum(
-                        max(margin1.bottom, margin2.top)
-                        for margin1, margin2 in zip(box_margins, box_margins[1:])
-                    )
-                    + (box_margins[0].top + box_margins[-1].bottom)
+                max(
+                    [
+                        margin_right + margin_left
+                        for _, margin_right, _, margin_left in box_margins
+                    ]
                 ),
+                sum(
+                    [
+                        max(margin1[2], margin2[0])
+                        for margin1, margin2 in zip(box_margins, box_margins[1:])
+                    ]
+                )
+                + (box_margins[0].top + box_margins[-1].bottom),
             )
         else:
             resolve_margin = Size(0, 0)

src/textual/strip.py

@@ -25,7 +25,7 @@ def get_line_length(segments: Iterable[Segment]) -> int:
         Length of line in cells.
     """
     _cell_len = cell_len
-    return sum(_cell_len(text) for text, _, control in segments if not control)
+    return sum([_cell_len(text) for text, _, control in segments if not control])
 
 
 class StripRenderable:

src/textual/widget.py

@@ -1056,7 +1056,7 @@ class Widget(DOMNode):
             options = self._console.options.update_width(width).update(highlight=False)
             segments = self._console.render(renderable, options)
             # Cheaper than counting the lines returned from render_lines!
-            height = sum(text.count("\n") for text, _, _ in segments)
+            height = sum([text.count("\n") for text, _, _ in segments])
             self._content_height_cache = (cache_key, height)
 
         return height

src/textual/widgets/_text_log.py

@@ -155,7 +155,7 @@ class TextLog(ScrollView, can_focus=True):
 
         self.max_width = max(
             self.max_width,
-            max(sum(segment.cell_length for segment in _line) for _line in lines),
+            max(sum([segment.cell_length for segment in _line]) for _line in lines),
         )
         strips = Strip.from_lines(lines)
         for strip in strips: