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from textual.app import App, ComposeResult
from textual.containers import Horizontal, Vertical
from textual.lazy import Lazy, Reveal
from textual.widgets import Label
class LazyApp(App):
def compose(self) -> ComposeResult:
with Vertical():
with Lazy(Horizontal()):
yield Label(id="foo")
with Horizontal():
yield Label(id="bar")
async def test_lazy():
app = LazyApp()
async with app.run_test() as pilot:
# No #foo on initial mount
assert len(app.query("#foo")) == 0
assert len(app.query("#bar")) == 1
await pilot.pause()
await pilot.pause()
# #bar mounted after refresh
assert len(app.query("#foo")) == 1
assert len(app.query("#bar")) == 1
class RevealApp(App):
def compose(self) -> ComposeResult:
with Reveal(Vertical()):
yield Label(id="foo")
yield Label(id="bar")
yield Label(id="baz")
async def test_lazy_reveal():
app = RevealApp()
async with app.run_test() as pilot:
# No #foo on initial mount
# Only first child should be available initially
assert app.query_one("#foo").display
# Next two aren't mounted yet
assert not app.query("#baz")
# All children should be visible after a pause
await pilot.pause()
for n in range(3):
await pilot.pause(1 / 60)
await pilot.pause()
assert app.query_one("#foo").display
assert app.query_one("#bar").display
assert app.query_one("#baz").display
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