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from __future__ import annotations
from textual import on
from textual.app import App, ComposeResult
from textual.events import Paste
from textual.widgets import Input
class InputApp(App[None]):
def __init__(self, initial: str | None = None) -> None:
super().__init__()
self.messages: list[str] = []
self._initial = initial
def compose(self) -> ComposeResult:
if self._initial:
yield Input(self._initial)
else:
yield Input()
@on(Input.Changed)
@on(Input.Submitted)
def log_message(self, event: Input.Submitted | Input.Changed) -> None:
assert event.control == event.input
self.messages.append(event.__class__.__name__)
async def test_no_startup_messages():
"""An input with no initial value should have no initial messages."""
async with InputApp().run_test() as pilot:
assert pilot.app.messages == []
async def test_startup_messages_with_initial_value():
"""An input with an initial value should send a changed event."""
async with InputApp("Hello, World!").run_test() as pilot:
assert pilot.app.messages == ["Changed"]
async def test_typing_from_empty_causes_changed():
"""An input with no initial value should send messages when entering text."""
input_text = "Hello, World!"
async with InputApp().run_test() as pilot:
await pilot.press(*input_text)
assert pilot.app.messages == ["Changed"] * len(input_text)
async def test_typing_from_pre_populated_causes_changed():
"""An input with initial value should send messages when entering text after an initial message."""
input_text = "Hello, World!"
async with InputApp(input_text).run_test() as pilot:
await pilot.press(*input_text)
assert pilot.app.messages == ["Changed"] + (["Changed"] * len(input_text))
async def test_submit_empty_input():
"""Pressing enter on an empty input should send a submitted event."""
async with InputApp().run_test() as pilot:
await pilot.press("enter")
assert pilot.app.messages == ["Submitted"]
async def test_submit_pre_populated_input():
"""Pressing enter on a pre-populated input should send a changed then submitted event."""
async with InputApp("The owls are not what they seem").run_test() as pilot:
await pilot.press("enter")
assert pilot.app.messages == ["Changed", "Submitted"]
async def test_paste_event_impact():
"""A paste event should result in a changed event."""
async with InputApp().run_test() as pilot:
await pilot.app._post_message(Paste("Hello, World"))
await pilot.pause()
assert pilot.app.messages == ["Changed"]
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