1 files changed, 90 insertions, 0 deletions
diff --git a/Lib/idlelib/windows.py b/Lib/idlelib/windows.py
new file mode 100644
index 0000000000..bc74348f56
--- /dev/null
+++ b/Lib/idlelib/windows.py
@@ -0,0 +1,90 @@
+from tkinter import *
+
+class WindowList:
+
+    def __init__(self):
+        self.dict = {}
+        self.callbacks = []
+
+    def add(self, window):
+        window.after_idle(self.call_callbacks)
+        self.dict[str(window)] = window
+
+    def delete(self, window):
+        try:
+            del self.dict[str(window)]
+        except KeyError:
+            # Sometimes, destroy() is called twice
+            pass
+        self.call_callbacks()
+
+    def add_windows_to_menu(self,  menu):
+        list = []
+        for key in self.dict:
+            window = self.dict[key]
+            try:
+                title = window.get_title()
+            except TclError:
+                continue
+            list.append((title, key, window))
+        list.sort()
+        for title, key, window in list:
+            menu.add_command(label=title, command=window.wakeup)
+
+    def register_callback(self, callback):
+        self.callbacks.append(callback)
+
+    def unregister_callback(self, callback):
+        try:
+            self.callbacks.remove(callback)
+        except ValueError:
+            pass
+
+    def call_callbacks(self):
+        for callback in self.callbacks:
+            try:
+                callback()
+            except:
+                t, v, tb = sys.exc_info()
+                print("warning: callback failed in WindowList", t, ":", v)
+
+registry = WindowList()
+
+add_windows_to_menu = registry.add_windows_to_menu
+register_callback = registry.register_callback
+unregister_callback = registry.unregister_callback
+
+
+class ListedToplevel(Toplevel):
+
+    def __init__(self, master, **kw):
+        Toplevel.__init__(self, master, kw)
+        registry.add(self)
+        self.focused_widget = self
+
+    def destroy(self):
+        registry.delete(self)
+        Toplevel.destroy(self)
+        # If this is Idle's last window then quit the mainloop
+        # (Needed for clean exit on Windows 98)
+        if not registry.dict:
+            self.quit()
+
+    def update_windowlist_registry(self, window):
+        registry.call_callbacks()
+
+    def get_title(self):
+        # Subclass can override
+        return self.wm_title()
+
+    def wakeup(self):
+        try:
+            if self.wm_state() == "iconic":
+                self.wm_withdraw()
+                self.wm_deiconify()
+            self.tkraise()
+            self.focused_widget.focus_set()
+        except TclError:
+            # This can happen when the window menu was torn off.
+            # Simply ignore it.
+            pass