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from itertools import cycle
from typing import Type
import pytest
from textual.app import (
ActiveModeError,
App,
ComposeResult,
InvalidModeError,
UnknownModeError,
)
from textual.screen import ModalScreen, Screen
from textual.widgets import Footer, Header, Label
class ScreenBindingsMixin(Screen[None]):
BINDINGS = [
("1", "one", "Mode 1"),
("2", "two", "Mode 2"),
("p", "push", "Push rnd scrn"),
("o", "app.pop_screen", "Pop"),
("r", "remove", "Remove mode 1"),
]
def action_one(self) -> None:
self.app.switch_mode("one")
def action_two(self) -> None:
self.app.switch_mode("two")
def action_fruits(self) -> None:
self.app.switch_mode("fruits")
def action_push(self) -> None:
self.app.push_screen(FruitModal())
class BaseScreen(ScreenBindingsMixin):
def __init__(self, label):
super().__init__()
self.label = label
def compose(self) -> ComposeResult:
yield Header()
yield Label(self.label)
yield Footer()
def action_remove(self) -> None:
self.app.remove_mode("one")
class FruitModal(ModalScreen[str], ScreenBindingsMixin):
BINDINGS = [("d", "dismiss_fruit", "Dismiss")]
def compose(self) -> ComposeResult:
FRUITS = cycle(
"apple mango strawberry banana peach pear melon watermelon".split()
)
yield Label(next(FRUITS))
@pytest.fixture
def ModesApp():
class ModesApp(App[None]):
MODES = {
"one": lambda: BaseScreen("one"),
"two": "screen_two",
}
SCREENS = {
"screen_two": lambda: BaseScreen("two"),
}
def on_mount(self):
self.switch_mode("one")
return ModesApp
async def test_mode_setup(ModesApp: Type[App]):
app = ModesApp()
async with app.run_test():
assert isinstance(app.screen, BaseScreen)
assert str(app.screen.query_one(Label).renderable) == "one"
async def test_switch_mode(ModesApp: Type[App]):
app = ModesApp()
async with app.run_test() as pilot:
await pilot.press("2")
assert str(app.screen.query_one(Label).renderable) == "two"
await pilot.press("1")
assert str(app.screen.query_one(Label).renderable) == "one"
async def test_switch_same_mode(ModesApp: Type[App]):
app = ModesApp()
async with app.run_test() as pilot:
await pilot.press("1")
assert str(app.screen.query_one(Label).renderable) == "one"
await pilot.press("1")
assert str(app.screen.query_one(Label).renderable) == "one"
async def test_switch_unknown_mode(ModesApp: Type[App]):
app = ModesApp()
async with app.run_test():
with pytest.raises(UnknownModeError):
await app.switch_mode("unknown mode here")
async def test_remove_mode(ModesApp: Type[App]):
app = ModesApp()
async with app.run_test() as pilot:
await app.switch_mode("two")
await pilot.pause()
assert str(app.screen.query_one(Label).renderable) == "two"
app.remove_mode("one")
assert "one" not in app._modes
async def test_remove_active_mode(ModesApp: Type[App]):
app = ModesApp()
async with app.run_test():
with pytest.raises(ActiveModeError):
app.remove_mode("one")
async def test_add_mode(ModesApp: Type[App]):
app = ModesApp()
async with app.run_test() as pilot:
app.add_mode("three", lambda: BaseScreen("three"))
await app.switch_mode("three")
await pilot.pause()
assert str(app.screen.query_one(Label).renderable) == "three"
async def test_add_mode_duplicated(ModesApp: Type[App]):
app = ModesApp()
async with app.run_test():
with pytest.raises(InvalidModeError):
app.add_mode("one", lambda: BaseScreen("one"))
async def test_screen_stack_preserved(ModesApp: Type[App]):
fruits = []
N = 5
app = ModesApp()
async with app.run_test() as pilot:
# Build the stack up.
for _ in range(N):
await pilot.press("p")
fruits.append(str(app.query_one(Label).renderable))
assert len(app.screen_stack) == N + 1
# Switch out and back.
await pilot.press("2")
assert len(app.screen_stack) == 1
await pilot.press("1")
# Check the stack.
assert len(app.screen_stack) == N + 1
for _ in range(N):
assert str(app.query_one(Label).renderable) == fruits.pop()
await pilot.press("o")
async def test_multiple_mode_callbacks():
written = []
class LogScreen(Screen[None]):
def __init__(self, value):
super().__init__()
self.value = value
def key_p(self) -> None:
self.app.push_screen(ResultScreen(self.value), written.append)
class ResultScreen(Screen[str]):
def __init__(self, value):
super().__init__()
self.value = value
def key_p(self) -> None:
self.dismiss(self.value)
def key_f(self) -> None:
self.app.switch_mode("first")
def key_o(self) -> None:
self.app.switch_mode("other")
class ModesApp(App[None]):
MODES = {
"first": lambda: LogScreen("first"),
"other": lambda: LogScreen("other"),
}
def on_mount(self) -> None:
self.switch_mode("first")
def key_f(self) -> None:
self.switch_mode("first")
def key_o(self) -> None:
self.switch_mode("other")
app = ModesApp()
async with app.run_test() as pilot:
# Push and dismiss ResultScreen("first")
await pilot.press("p")
await pilot.press("p")
assert written == ["first"]
# Push ResultScreen("first")
await pilot.press("p")
# Switch to LogScreen("other")
await pilot.press("o")
# Push and dismiss ResultScreen("other")
await pilot.press("p")
await pilot.press("p")
assert written == ["first", "other"]
# Go back to ResultScreen("first")
await pilot.press("f")
# Dismiss ResultScreen("first")
await pilot.press("p")
assert written == ["first", "other", "first"]
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