prototype screens api

sandbox/uber.py

@@ -43,7 +43,7 @@ class BasicApp(App):
         self.panic(self.app.tree)
 
     def action_dump(self):
-        self.panic(str(self.app.registry))
+        self.panic(str(self.app._registry))
 
     def action_log_tree(self):
         self.log(self.screen.tree)

sandbox/will/screens.py

@@ -0,0 +1,65 @@
+from textual.app import App, Screen, ComposeResult
+from textual.widgets import Static, Footer, Pretty
+
+
+class ModalScreen(Screen):
+    def compose(self) -> ComposeResult:
+        yield Pretty(self.app._screen_stack)
+        yield Footer()
+
+    def on_screen_resume(self):
+        self.query("*").refresh()
+
+
+class NewScreen(Screen):
+    def compose(self):
+        yield Pretty(self.app._screen_stack)
+        yield Footer()
+
+    def on_screen_resume(self):
+        self.query("*").refresh()
+
+
+class ScreenApp(App):
+    CSS = """
+    ScreenApp Screen {
+        background: #111144;
+        color: white;
+    }
+    ScreenApp ModalScreen {
+        background: #114411;
+        color: white;
+    }
+    ScreenApp Static {
+        height: 100%;        
+        content-align: center middle;
+    }
+    """
+
+    SCREENS = {
+        "1": NewScreen("screen 1"),
+        "2": NewScreen("screen 2"),
+        "3": NewScreen("screen 3"),
+    }
+
+    def compose(self) -> ComposeResult:
+        yield Static("On Screen 1")
+        yield Footer()
+
+    def on_mount(self) -> None:
+        self.bind("1", "switch_screen('1')", description="Screen 1")
+        self.bind("2", "switch_screen('2')", description="Screen 2")
+        self.bind("3", "switch_screen('3')", description="Screen 3")
+        self.bind("s", "modal_screen", description="add screen")
+        self.bind("escape", "back", description="Go back")
+
+    def action_back(self) -> None:
+        self.pop_screen()
+        self.log(self.app._registry)
+
+    def action_modal_screen(self) -> None:
+        self.push_screen(ModalScreen())
+
+
+app = ScreenApp()
+app.run()