mirror of
https://github.com/Textualize/textual.git
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73 lines
2.2 KiB
Python
73 lines
2.2 KiB
Python
from __future__ import annotations
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from pathlib import Path
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from sys import argv
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from textual.app import App, ComposeResult
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from textual.reactive import var
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from textual.widgets import Footer, MarkdownViewer
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class MarkdownApp(App):
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"""A simple Markdown viewer application."""
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BINDINGS = [
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("t", "toggle_table_of_contents", "TOC"),
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("b", "back", "Back"),
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("f", "forward", "Forward"),
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]
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path = var(Path(__file__).parent / "demo.md")
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@property
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def markdown_viewer(self) -> MarkdownViewer:
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"""Get the Markdown widget."""
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return self.query_one(MarkdownViewer)
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def compose(self) -> ComposeResult:
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yield Footer()
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yield MarkdownViewer()
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async def on_mount(self) -> None:
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"""Go to the first path when the app starts."""
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try:
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await self.markdown_viewer.go(self.path)
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except FileNotFoundError:
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self.exit(message=f"Unable to load {self.path!r}")
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def on_markdown_viewer_navigator_updated(self) -> None:
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"""Refresh bindings for forward / back when the document changes."""
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self.refresh_bindings()
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def action_toggle_table_of_contents(self) -> None:
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"""Toggles display of the table of contents."""
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self.markdown_viewer.show_table_of_contents = (
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not self.markdown_viewer.show_table_of_contents
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)
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async def action_back(self) -> None:
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"""Navigate backwards."""
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await self.markdown_viewer.back()
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async def action_forward(self) -> None:
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"""Navigate forwards."""
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await self.markdown_viewer.forward()
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def check_action(self, action: str, _) -> bool | None:
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"""Check if certain actions can be performed."""
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if action == "forward" and self.markdown_viewer.navigator.end:
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# Disable footer link if we can't go forward
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return None
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if action == "back" and self.markdown_viewer.navigator.start:
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# Disable footer link if we can't go backward
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return None
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# All other keys display as normal
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return True
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if __name__ == "__main__":
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app = MarkdownApp()
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if len(argv) > 1 and Path(argv[1]).exists():
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app.path = Path(argv[1])
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app.run()
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