feat: 新增技能扩展N15一章相关示例源码

code/newsletter/N15/02_widgets.py

@@ -0,0 +1,70 @@
+import re
+from textwrap import dedent
+
+from textual.app import App, ComposeResult
+from textual.containers import Container
+from textual.reactive import reactive
+from textual.widgets import Footer, Header, Static
+
+lorem = """\
+Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+Sed eget suscipit ligula.
+Curabitur id justo imperdiet, pretium orci sed, tempus leo.
+Integer vulputate vitae diam efficitur tempus.
+Donec vel est ac purus feugiat ultricies sit amet non sapien.
+Vivamus faucibus viverra bibendum.
+Integer congue sed mi et imperdiet. Praesent quis dapibus neque.
+Cras arcu purus, laoreet eu nibh scelerisque, bibendum tincidunt mauris.
+Cras congue erat leo, non efficitur tellus auctor a.
+"""
+
+
+class LoremWidget(Static):
+
+    is_highlight = reactive(False, layout=True)
+    _RE_LOREM = re.compile("(?P<target>Lorem ipsum)", re.I)
+
+    _cache_lorem = None
+    _raw_lorem = dedent(lorem)
+
+    def on_mount(self) -> None:
+        self.update(self._raw_lorem)
+
+    async def watch_is_highlight(self, old_value, new_value) -> None:
+        if self.is_highlight:
+            content = self.marked_lorem()
+            self.update(content)
+        else:
+            self.update(self._raw_lorem)
+
+    def marked_lorem(self):
+        if self._cache_lorem:
+            return self._cache_lorem
+
+        content = self._RE_LOREM.sub(r"[u red b]\1[/]", lorem)
+        self._cache_lorem = content
+        return content
+
+
+class SimpleApp(App):
+    BINDINGS = [
+        ("h", "highlight", "Highlight lorem"),
+        ("q", "quit", "Quit"),
+    ]
+
+    def compose(self) -> ComposeResult:
+        yield Header()
+        yield Container(LoremWidget(id="lorem"))
+        yield Footer()
+
+    def action_highlight(self) -> None:
+        widget = self.query_one("#lorem")
+        widget.is_highlight = not widget.is_highlight
+
+    def action_quit(self) -> None:
+        self.exit(0)
+
+
+if __name__ == '__main__':
+    app = SimpleApp()
+    app.run()