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import os
from pathlib import Path
from textual.app import App, ComposeResult
from textual.screen import Screen
from textual.widgets import Label
CSS_PATH = (Path(__file__) / "../css_reloading.tcss").resolve()
class BaseScreen(Screen[None]):
def compose(self) -> ComposeResult:
yield Label("I am the base screen")
class TopScreen(Screen[None]):
DEFAULT_CSS = """
TopScreen {
opacity: 1;
background: green 0%;
}
"""
class MyApp(App[None]):
CSS_PATH = CSS_PATH
def on_mount(self) -> None:
self.push_screen(BaseScreen())
self.push_screen(TopScreen())
async def test_css_reloading_applies_to_non_top_screen(monkeypatch) -> None: # type: ignore
"""Regression test for https://github.com/Textualize/textual/issues/3931"""
monkeypatch.setenv(
"TEXTUAL", "debug"
) # This will make sure we create a file monitor.
# Write some initial CSS.
Path(CSS_PATH).write_text(
"""\
Label {
height: 5;
border: panel white;
}
"""
)
app = MyApp()
async with app.run_test() as pilot:
await pilot.pause()
first_label = pilot.app.screen_stack[-2].query(Label).first()
# Sanity check.
assert first_label.styles.height is not None
assert first_label.styles.height.value == 5
# Clear the CSS from the file.
Path(CSS_PATH).write_text("/* This file has no rules intentionally. */\n")
await pilot.pause()
await pilot.app._on_css_change()
# Height should fall back to 1.
assert first_label.styles.height is not None
assert first_label.styles.height.value == 1
async def test_css_reloading_file_not_found(monkeypatch, tmp_path):
"""Regression test for https://github.com/Textualize/textual/issues/3996
Files can become temporarily unavailable during saving on certain environments.
"""
monkeypatch.setenv("TEXTUAL", "debug")
css_path = tmp_path / "test_css_reloading_file_not_found.tcss"
with open(css_path, "w") as css_file:
css_file.write("#a {color: red;}")
class TextualApp(App):
CSS_PATH = css_path
app = TextualApp()
async with app.run_test() as pilot:
await pilot.app._on_css_change()
os.remove(css_path)
assert not css_path.exists()
await pilot.app._on_css_change()
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