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from textual.app import App, ComposeResult
from textual.containers import HorizontalScroll
from textual.reactive import reactive
from textual.widgets import Footer, Placeholder
PAGES_COUNT = 5
class PagesApp(App):
BINDINGS = [
("n", "next", "Next"),
("p", "previous", "Previous"),
]
CSS_PATH = "actions06.tcss"
page_no = reactive(0)
def compose(self) -> ComposeResult:
with HorizontalScroll(id="page-container"):
for page_no in range(PAGES_COUNT):
yield Placeholder(f"Page {page_no}", id=f"page-{page_no}")
yield Footer()
def action_next(self) -> None:
self.page_no += 1
self.refresh_bindings() # (1)!
self.query_one(f"#page-{self.page_no}").scroll_visible()
def action_previous(self) -> None:
self.page_no -= 1
self.refresh_bindings() # (2)!
self.query_one(f"#page-{self.page_no}").scroll_visible()
def check_action(
self, action: str, parameters: tuple[object, ...]
) -> bool | None: # (3)!
"""Check if an action may run."""
if action == "next" and self.page_no == PAGES_COUNT - 1:
return False
if action == "previous" and self.page_no == 0:
return False
return True
if __name__ == "__main__":
app = PagesApp()
app.run()
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