def tk(timeout=5):
root = Tk() # default root
root.withdraw() # remove from the screen
# destroy all widgets in `timeout` seconds
func_id = root.after(int(1000 * timeout), root.quit)
try:
yield root
finally: # cleanup
root.after_cancel(func_id) # cancel callback
root.destroy()
class IOGui(object):
"""
A gui with simple comms interface.
"""
def __init__(self, io):
"""
"""
self._pending_quit = False
self._io = io
self._root = Tk()
self._root.title('%s %s@%s' % (io.name, io._host, io._port))
self._root.protocol('WM_DELETE_WINDOW', self._delete_window)
self.create_widgets()
self._suspend()
self._root.mainloop()
def _delete_window(self):
"""
Tell the io to stop.
Note: do not quit until the io reports finished (unless the io seems to be stuck).
"""
if self._pending_quit:
self._cleanup()
else:
self._pending_quit = True
self._io.quit()
def _cleanup(self):
"""
Tidy up and go!
"""
if self._suspended:
self._root.after_cancel(self._suspended)
self._root.quit()
def _suspend(self):
"""
Short delay before checking the queue again.
"""
self._suspended = self._root.after(20, self._check_io)
def _check_io(self):
"""
read all messages from io and pass on as methods
"""
self._suspended = None
while True:
data = self._io.get()
if not data:
self._suspend()
return
sender = data[0]
method = data[1]
if method in message.messages:
getattr(self, method)(sender, *data[2:])
else:
print('missing method for message', data)
@property
def root(self):
"""
"""
return self._root
@message
def error_msg(self, sender, msg):
"""
Called to report errors.
"""
print('roll your own error_msg handler', sender, msg)
@message
def started_msg(self, sender, host, port):
"""
Called whenever a connection is made.
"""
print('roll your own started_msg handler', sender, host, port)
@message
def bye_msg(self, sender):
"""
Called just before a connection is broken.
"""
print('roll your own bye_msg handler', sender)
@message
def finished_msg(self, sender):
"""
Called whenever a connection is broken.
If you roll your own be sure to call this one when all is done.
"""
self._cleanup()
