File: animation01.py

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textual 2.1.2-1
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from textual.app import App, ComposeResult
from textual.widgets import Static


class AnimationApp(App):
    def compose(self) -> ComposeResult:
        self.box = Static("Hello, World!")
        self.box.styles.background = "red"
        self.box.styles.color = "black"
        self.box.styles.padding = (1, 2)
        yield self.box

    def on_mount(self):
        self.box.styles.animate("opacity", value=0.0, duration=2.0)


if __name__ == "__main__":
    app = AnimationApp()
    app.run()