width fix

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 
 - Fix priority bindings not appearing in footer when key clashes with focused widget https://github.com/Textualize/textual/pull/4342
+- Reverted auto-width change https://github.com/Textualize/textual/pull/4369
 
 ### Changed
 

src/textual/_layout.py

@@ -160,7 +160,7 @@ def get_content_width(self, widget: Widget, container: Size, viewport: Size) ->
         if not widget._nodes:
             width = 0
         else:
-            arrangement = widget._arrange(Size(container.width, 0))
+            arrangement = widget._arrange(Size(0, 0))
             return arrangement.total_region.right
         return width
 

src/textual/_resolve.py

@@ -86,7 +86,7 @@ def resolve_fraction_unit(
     remaining_space: Fraction,
     resolve_dimension: Literal["width", "height"] = "width",
 ) -> Fraction:
-    """Calculate the fraction
+    """Calculate the fraction.
 
     Args:
         widget_styles: Styles for widgets with fraction units.

src/textual/widgets/_button.py

@@ -4,6 +4,7 @@
 from typing import TYPE_CHECKING, cast
 
 import rich.repr
+from rich.cells import cell_len
 from rich.console import ConsoleRenderable, RenderableType
 from rich.text import Text, TextType
 from typing_extensions import Literal, Self
@@ -15,6 +16,7 @@
 
 from ..binding import Binding
 from ..css._error_tools import friendly_list
+from ..geometry import Size
 from ..message import Message
 from ..pad import HorizontalPad
 from ..reactive import reactive
@@ -203,6 +205,13 @@ def __init__(
         self.active_effect_duration = 0.3
         """Amount of time in seconds the button 'press' animation lasts."""
 
+    def get_content_width(self, container: Size, viewport: Size) -> int:
+        try:
+            return max([cell_len(line) for line in self.label.plain.splitlines()]) + 2
+        except ValueError:
+            # Empty string label
+            return 2
+
     def __rich_repr__(self) -> rich.repr.Result:
         yield from super().__rich_repr__()
         yield "variant", self.variant, "default"

tests/snapshot_tests/snapshot_apps/width_100.py

@@ -0,0 +1,36 @@
+from textual.app import App, ComposeResult
+from textual.containers import Vertical
+from textual.widgets import Label
+
+
+class Width100PCentApp(App[None]):
+
+    CSS = """
+    Vertical {
+        border: solid red;
+        width: auto;
+
+        Label {
+            border: solid green;
+        }
+
+        #first {
+            width: 100%;
+        }
+
+        #second {
+            width: auto;
+        }
+    }
+    """
+
+    def compose(self) -> ComposeResult:
+        with Vertical():
+            yield Label("I want to be 100% of my parent", id="first")
+            yield Label(
+                "I want my parent to be wide enough to wrap me and no more", id="second"
+            )
+
+
+if __name__ == "__main__":
+    Width100PCentApp().run()

tests/snapshot_tests/test_snapshots.py

@@ -686,6 +686,7 @@ async def run_before(pilot):
         run_before=run_before,
     )
 
+
 def test_markdown_space_squashing(snap_compare):
     assert snap_compare(SNAPSHOT_APPS_DIR / "markdown_whitespace.py")
 
@@ -1174,3 +1175,8 @@ def test_welcome(snap_compare):
 def test_button_with_console_markup(snap_compare):
     """Regression test for https://github.com/Textualize/textual/issues/4328"""
     assert snap_compare(SNAPSHOT_APPS_DIR / "button_markup.py")
+
+
+def test_width_100(snap_compare):
+    """Regression test for https://github.com/Textualize/textual/issues/4360"""
+    assert snap_compare(SNAPSHOT_APPS_DIR / "width_100.py")