beginnings

app.py

@@ -0,0 +1,45 @@
+
+import tkinter as tk
+import tkinter.ttk as ttk
+
+
+class Stage(ttk.Frame):
+    def __init__(self, title, refresh_action, value=None, master=None):
+        super().__init__(master)
+        self.pack()
+        self.title = title
+        self.refresh_action = refresh_action
+        self.text = tk.Text(self)
+        self.text.pack()
+        if value is not None:
+            self.text.insert(tk.INSERT, value)
+        self.refresh = ttk.Button(text="Refresh", command=self.do_refresh)
+        self.refresh.pack()
+
+    def do_refresh(self):
+        self.refresh_action(self.text.get(1.0, "end-1c"))
+
+class App(tk.Tk):
+    DEFAULT_SOURCE = "print('Hello World!')"
+
+    def __init__(self, master=None):
+        super().__init__(master)
+        self.title("Hello World")
+        ttk.Label(text="Hello, Tkinter").pack()
+        self.source = Stage('source',
+                            self.refresh_source,
+                            value=self.DEFAULT_SOURCE,
+                            master=master)
+        ttk.Button(text="exit", command=self.exit).pack()
+
+    def refresh_source(self, text):
+        print(f'source:', text)
+
+    def exit(self):
+        self.destroy()
+
+window = App()
+
+# Start the event loop.
+window.mainloop()
+