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from tkinter import Toplevel, TclError
import sys
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
if __name__ == "__main__":
from unittest import main
main('idlelib.idle_test.test_window', verbosity=2)