1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
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)
total = reactive(0.0)
def on_mount(self) -> None:
"""Event handler called when widget is added to the app."""
self.update_timer = self.set_interval(1 / 60, self.update_time, pause=True)
def update_time(self) -> None:
"""Method to update time to current."""
self.time = self.total + (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}")
def start(self) -> None:
"""Method to start (or resume) time updating."""
self.start_time = monotonic()
self.update_timer.resume()
def stop(self) -> None:
"""Method to stop the time display updating."""
self.update_timer.pause()
self.total += monotonic() - self.start_time
self.time = self.total
def reset(self) -> None:
"""Method to reset the time display to zero."""
self.total = 0
self.time = 0
class Stopwatch(HorizontalGroup):
"""A stopwatch widget."""
def on_button_pressed(self, event: Button.Pressed) -> None:
"""Event handler called when a button is pressed."""
button_id = event.button.id
time_display = self.query_one(TimeDisplay)
if button_id == "start":
time_display.start()
self.add_class("started")
elif button_id == "stop":
time_display.stop()
self.remove_class("started")
elif button_id == "reset":
time_display.reset()
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:
"""Called to add widgets to 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()
|
