✨ Test code for Textualize/textual#1355

in_visible.py

@@ -0,0 +1,55 @@
+"""https://github.com/Textualize/textual/issues/1355"""
+
+from textual.app import App, ComposeResult
+from textual.widgets import Header, Footer, Label, Button
+from textual.containers import Vertical
+
+class ShowHideApp( App[ None ] ):
+
+    CSS = """
+    Horizontal {
+        height: 1fr;
+        border: solid red;
+    }
+    Button {
+       width: 100%;
+       height: 1fr;
+    }
+    Label {
+        width: 100%;
+        height: 9fr;
+        content-align: center middle;
+        background: #888800;
+        visibility: visible;
+    }
+
+    .hidden {
+        visibility: hidden;
+    }
+    """
+
+    def compose(self) -> ComposeResult:
+        yield Header()
+        yield Vertical(
+            Vertical(
+                Button( "Toggle show/hide via code", id="via-code" ),
+                Label( "I can be toggled via code; press the button", id="via-code-label" )
+            ),
+            Vertical(
+                Button( "Toggle show/hide via classes", id="via-classes" ),
+                Label( "I can be toggled via classes; press the button", id="via-classes-label" )
+            )
+        )
+        yield Footer()
+
+    def on_button_pressed( self, event: Button.Pressed ) -> None:
+        if event.button.id == "via-code":
+            label = self.query_one( "#via-code-label" )
+            label.styles.visibility = "visible" if label.styles.visibility == "hidden" else "hidden"
+            self.refresh(layout=True)
+        elif event.button.id == "via-classes":
+            self.query_one( "#via-classes-label" ).toggle_class( "hidden" )
+
+if __name__ == "__main__":
+    ShowHideApp().run()
+