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from textual.app import App, ComposeResult
from textual.color import Color, ColorParseError
from textual.containers import Grid
from textual.reactive import reactive
from textual.widgets import Input, Static
class WatchApp(App):
CSS_PATH = "watch01.tcss"
color = reactive(Color.parse("transparent")) # (1)!
def compose(self) -> ComposeResult:
yield Input(placeholder="Enter a color")
yield Grid(Static(id="old"), Static(id="new"), id="colors")
def watch_color(self, old_color: Color, new_color: Color) -> None: # (2)!
self.query_one("#old").styles.background = old_color
self.query_one("#new").styles.background = new_color
def on_input_submitted(self, event: Input.Submitted) -> None:
try:
input_color = Color.parse(event.value)
except ColorParseError:
pass
else:
self.query_one(Input).value = ""
self.color = input_color # (3)!
if __name__ == "__main__":
app = WatchApp()
app.run()
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