File size: 3,584 Bytes
5b76e0f | 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 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | from __future__ import annotations
from rich.console import RenderableType
from textual._easing import EASING
from textual.app import App, ComposeResult
from textual.cli.previews.borders import TEXT
from textual.containers import Container, Horizontal, Vertical
from textual.reactive import Reactive
from textual.scrollbar import ScrollBarRender
from textual.widget import Widget
from textual.widgets import Button, Footer, Static, Input
VIRTUAL_SIZE = 100
WINDOW_SIZE = 10
START_POSITION = 0.0
END_POSITION = float(VIRTUAL_SIZE - WINDOW_SIZE)
class EasingButtons(Widget):
def compose(self) -> ComposeResult:
for easing in sorted(EASING, reverse=True):
yield Button(easing, id=easing)
class Bar(Widget):
position = Reactive.init(START_POSITION)
animation_running = Reactive(False)
DEFAULT_CSS = """
Bar {
background: $surface;
color: $error;
}
Bar.-active {
background: $surface;
color: $success;
}
"""
def watch_animation_running(self, running: bool) -> None:
self.set_class(running, "-active")
def render(self) -> RenderableType:
return ScrollBarRender(
virtual_size=VIRTUAL_SIZE,
window_size=WINDOW_SIZE,
position=self.position,
style=self.rich_style,
)
class EasingApp(App):
position = Reactive.init(START_POSITION)
duration = Reactive.var(1.0)
def on_load(self):
self.bind(
"ctrl+p", "focus('duration-input')", description="Focus: Duration Input"
)
self.bind("ctrl+b", "toggle_dark", description="Toggle Dark")
def compose(self) -> ComposeResult:
self.animated_bar = Bar()
self.animated_bar.position = START_POSITION
duration_input = Input("1.0", placeholder="Duration", id="duration-input")
self.opacity_widget = Static(
f"[b]Welcome to Textual![/]\n\n{TEXT}", id="opacity-widget"
)
yield EasingButtons()
yield Vertical(
Horizontal(
Static("Animation Duration:", id="label"), duration_input, id="inputs"
),
Horizontal(
self.animated_bar,
Container(self.opacity_widget, id="other"),
),
Footer(),
)
def on_button_pressed(self, event: Button.Pressed) -> None:
self.animated_bar.animation_running = True
def _animation_complete():
self.animated_bar.animation_running = False
target_position = (
END_POSITION if self.position == START_POSITION else START_POSITION
)
self.animate(
"position",
value=target_position,
final_value=target_position,
duration=self.duration,
easing=event.button.id,
on_complete=_animation_complete,
)
def watch_position(self, value: int):
self.animated_bar.position = value
self.opacity_widget.styles.opacity = 1 - value / END_POSITION
def on_input_changed(self, event: Input.Changed):
if event.sender.id == "duration-input":
new_duration = _try_float(event.value)
if new_duration is not None:
self.duration = new_duration
def action_toggle_dark(self):
self.dark = not self.dark
def _try_float(string: str) -> float | None:
try:
return float(string)
except ValueError:
return None
app = EasingApp(css_path="easing.css")
if __name__ == "__main__":
app.run()
|