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from textual.app import App, ComposeResult
from textual.screen import Screen
from textual.widgets import Placeholder
class Header(Placeholder):
DEFAULT_CSS = """
Header {
height: 3;
dock: top;
}
"""
class Footer(Placeholder):
DEFAULT_CSS = """
Footer {
height: 3;
dock: bottom;
}
"""
class ColumnsContainer(Placeholder):
DEFAULT_CSS = """
ColumnsContainer {
width: 1fr;
height: 1fr;
border: solid white;
}
""" # (1)!
class TweetScreen(Screen):
def compose(self) -> ComposeResult:
yield Header(id="Header")
yield Footer(id="Footer")
yield ColumnsContainer(id="Columns")
class LayoutApp(App):
def on_ready(self) -> None:
self.push_screen(TweetScreen())
if __name__ == "__main__":
app = LayoutApp()
app.run()
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