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from time import monotonic
from textual.app import App, ComposeResult
from textual.containers import HorizontalGroup, VerticalScroll
from textual.reactive import reactive
from textual.widgets import Button, Digits, Footer, Header
class TimeDisplay(Digits):
"""A widget to display elapsed time."""
start_time = reactive(monotonic)
time = reactive(0.0)
def on_mount(self) -> None:
"""Event handler called when widget is added to the app."""
self.set_interval(1 / 60, self.update_time)
def update_time(self) -> None:
"""Method to update the time to the current time."""
self.time = monotonic() - self.start_time
def watch_time(self, time: float) -> None:
"""Called when the time attribute changes."""
minutes, seconds = divmod(time, 60)
hours, minutes = divmod(minutes, 60)
self.update(f"{hours:02,.0f}:{minutes:02.0f}:{seconds:05.2f}")
class Stopwatch(HorizontalGroup):
"""A stopwatch widget."""
def on_button_pressed(self, event: Button.Pressed) -> None:
"""Event handler called when a button is pressed."""
if event.button.id == "start":
self.add_class("started")
elif event.button.id == "stop":
self.remove_class("started")
def compose(self) -> ComposeResult:
"""Create child widgets of a stopwatch."""
yield Button("Start", id="start", variant="success")
yield Button("Stop", id="stop", variant="error")
yield Button("Reset", id="reset")
yield TimeDisplay()
class StopwatchApp(App):
"""A Textual app to manage stopwatches."""
CSS_PATH = "stopwatch04.tcss"
BINDINGS = [("d", "toggle_dark", "Toggle dark mode")]
def compose(self) -> ComposeResult:
"""Create child widgets for the app."""
yield Header()
yield Footer()
yield VerticalScroll(Stopwatch(), Stopwatch(), Stopwatch())
def action_toggle_dark(self) -> None:
"""An action to toggle dark mode."""
self.theme = (
"textual-dark" if self.theme == "textual-light" else "textual-light"
)
if __name__ == "__main__":
app = StopwatchApp()
app.run()
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