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"""Test the workings of reacting to AppFocus and AppBlur."""
from textual.app import App, ComposeResult
from textual.events import AppBlur, AppFocus
from textual.widgets import Input
class FocusBlurApp(App[None]):
AUTO_FOCUS = "#input-4"
def compose(self) -> ComposeResult:
for n in range(10):
yield Input(id=f"input-{n}")
async def test_app_blur() -> None:
"""Test that AppBlur removes focus."""
async with FocusBlurApp().run_test() as pilot:
assert pilot.app.focused is not None
assert pilot.app.focused.id == "input-4"
pilot.app.post_message(AppBlur())
await pilot.pause()
assert pilot.app.focused is None
async def test_app_focus_restores_focus() -> None:
"""Test that AppFocus restores the correct focus."""
async with FocusBlurApp().run_test() as pilot:
assert pilot.app.focused is not None
assert pilot.app.focused.id == "input-4"
pilot.app.post_message(AppBlur())
await pilot.pause()
assert pilot.app.focused is None
pilot.app.post_message(AppFocus())
await pilot.pause()
assert pilot.app.focused is not None
assert pilot.app.focused.id == "input-4"
async def test_app_focus_restores_none_focus() -> None:
"""Test that AppFocus doesn't set focus if nothing was focused."""
async with FocusBlurApp().run_test() as pilot:
pilot.app.screen.focused = None
pilot.app.post_message(AppBlur())
await pilot.pause()
assert pilot.app.focused is None
pilot.app.post_message(AppFocus())
await pilot.pause()
assert pilot.app.focused is None
async def test_app_focus_handles_missing_widget() -> None:
"""Test that AppFocus works even when the last-focused widget has gone away."""
async with FocusBlurApp().run_test() as pilot:
assert pilot.app.focused is not None
assert pilot.app.focused.id == "input-4"
pilot.app.post_message(AppBlur())
await pilot.pause()
assert pilot.app.focused is None
await pilot.app.query_one("#input-4").remove()
pilot.app.post_message(AppFocus())
await pilot.pause()
assert pilot.app.focused is None
async def test_app_focus_defers_to_new_focus() -> None:
"""Test that AppFocus doesn't undo a fresh focus done while the app is in AppBlur state."""
async with FocusBlurApp().run_test() as pilot:
assert pilot.app.focused is not None
assert pilot.app.focused.id == "input-4"
pilot.app.post_message(AppBlur())
await pilot.pause()
assert pilot.app.focused is None
pilot.app.query_one("#input-1").focus()
await pilot.pause()
pilot.app.post_message(AppFocus())
await pilot.pause()
assert pilot.app.focused.id == "input-1"
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