这可能会或可能不会对你有帮助,但它有可能使tkinter
线程安全的,确保其代码和方法是在特定线程的根上执行被实例化。可以在Python Cookbook上找到一个用该概念进行实验的项目,名称为recipe 577633(Directory Pruner 2)。下面的代码来自第76 - 253行,使用小部件很容易扩展。
主线程安全支持
# Import several GUI libraries.
import tkinter.ttk
import tkinter.filedialog
import tkinter.messagebox
# Import other needed modules.
import queue
import _thread
import operator
################################################################################
class AffinityLoop:
"Restricts code execution to thread that instance was created on."
__slots__ = '__action', '__thread'
def __init__(self):
"Initialize AffinityLoop with job queue and thread identity."
self.__action = queue.Queue()
self.__thread = _thread.get_ident()
def run(self, func, *args, **keywords):
"Run function on creating thread and return result."
if _thread.get_ident() == self.__thread:
self.__run_jobs()
return func(*args, **keywords)
else:
job = self.__Job(func, args, keywords)
self.__action.put_nowait(job)
return job.result
def __run_jobs(self):
"Run all pending jobs currently in the job queue."
while not self.__action.empty():
job = self.__action.get_nowait()
job.execute()
########################################################################
class __Job:
"Store information to run a job at a later time."
__slots__ = ('__func', '__args', '__keywords',
'__error', '__mutex', '__value')
def __init__(self, func, args, keywords):
"Initialize the job's info and ready for execution."
self.__func = func
self.__args = args
self.__keywords = keywords
self.__error = False
self.__mutex = _thread.allocate_lock()
self.__mutex.acquire()
def execute(self):
"Run the job, store any error, and return to sender."
try:
self.__value = self.__func(*self.__args, **self.__keywords)
except Exception as error:
self.__error = True
self.__value = error
self.__mutex.release()
@property
def result(self):
"Return execution result or raise an error."
self.__mutex.acquire()
if self.__error:
raise self.__value
return self.__value
################################################################################
class _ThreadSafe:
"Create a thread-safe GUI class for safe cross-threaded calls."
ROOT = tkinter.Tk
def __init__(self, master=None, *args, **keywords):
"Initialize a thread-safe wrapper around a GUI base class."
if master is None:
if self.BASE is not self.ROOT:
raise ValueError('Widget must have a master!')
self.__job = AffinityLoop() # Use Affinity() if it does not break.
self.__schedule(self.__initialize, *args, **keywords)
else:
self.master = master
self.__job = master.__job
self.__schedule(self.__initialize, master, *args, **keywords)
def __initialize(self, *args, **keywords):
"Delegate instance creation to later time if necessary."
self.__obj = self.BASE(*args, **keywords)
########################################################################
# Provide a framework for delaying method execution when needed.
def __schedule(self, *args, **keywords):
"Schedule execution of a method till later if necessary."
return self.__job.run(self.__run, *args, **keywords)
@classmethod
def __run(cls, func, *args, **keywords):
"Execute the function after converting the arguments."
args = tuple(cls.unwrap(i) for i in args)
keywords = dict((k, cls.unwrap(v)) for k, v in keywords.items())
return func(*args, **keywords)
@staticmethod
def unwrap(obj):
"Unpack inner objects wrapped by _ThreadSafe instances."
return obj.__obj if isinstance(obj, _ThreadSafe) else obj
########################################################################
# Allow access to and manipulation of wrapped instance's settings.
def __getitem__(self, key):
"Get a configuration option from the underlying object."
return self.__schedule(operator.getitem, self, key)
def __setitem__(self, key, value):
"Set a configuration option on the underlying object."
return self.__schedule(operator.setitem, self, key, value)
########################################################################
# Create attribute proxies for methods and allow their execution.
def __getattr__(self, name):
"Create a requested attribute and return cached result."
attr = self.__Attr(self.__callback, (name,))
setattr(self, name, attr)
return attr
def __callback(self, path, *args, **keywords):
"Schedule execution of named method from attribute proxy."
return self.__schedule(self.__method, path, *args, **keywords)
def __method(self, path, *args, **keywords):
"Extract a method and run it with the provided arguments."
method = self.__obj
for name in path:
method = getattr(method, name)
return method(*args, **keywords)
########################################################################
class __Attr:
"Save an attribute's name and wait for execution."
__slots__ = '__callback', '__path'
def __init__(self, callback, path):
"Initialize proxy with callback and method path."
self.__callback = callback
self.__path = path
def __call__(self, *args, **keywords):
"Run a known method with the given arguments."
return self.__callback(self.__path, *args, **keywords)
def __getattr__(self, name):
"Generate a proxy object for a sub-attribute."
if name in {'__func__', '__name__'}:
# Hack for the "tkinter.__init__.Misc._register" method.
raise AttributeError('This is not a real method!')
return self.__class__(self.__callback, self.__path + (name,))
################################################################################
# Provide thread-safe classes to be used from tkinter.
class Tk(_ThreadSafe): BASE = tkinter.Tk
class Frame(_ThreadSafe): BASE = tkinter.ttk.Frame
class Button(_ThreadSafe): BASE = tkinter.ttk.Button
class Entry(_ThreadSafe): BASE = tkinter.ttk.Entry
class Progressbar(_ThreadSafe): BASE = tkinter.ttk.Progressbar
class Treeview(_ThreadSafe): BASE = tkinter.ttk.Treeview
class Scrollbar(_ThreadSafe): BASE = tkinter.ttk.Scrollbar
class Sizegrip(_ThreadSafe): BASE = tkinter.ttk.Sizegrip
class Menu(_ThreadSafe): BASE = tkinter.Menu
class Directory(_ThreadSafe): BASE = tkinter.filedialog.Directory
class Message(_ThreadSafe): BASE = tkinter.messagebox.Message
如果你读了应用程序的其余部分,你会发现,它是建立与定义为_ThreadSafe
变种,你是小部件用于在其他tkinter
应用程序中看到。当方法调用从各个线程进入时,它们会自动保持,直到可以在创建线程上执行这些调用。注意mainloop
是如何通过线的方式取代291 - 298和326 - 336
通知NoDefaltRoot &中main_loop呼吁
@classmethod
def main(cls):
"Create an application containing a single TrimDirView widget."
tkinter.NoDefaultRoot()
root = cls.create_application_root()
cls.attach_window_icon(root, ICON)
view = cls.setup_class_instance(root)
cls.main_loop(root)
中main_loop允许线程执行
@staticmethod
def main_loop(root):
"Process all GUI events according to tkinter's settings."
target = time.clock()
while True:
try:
root.update()
except tkinter.TclError:
break
target += tkinter._tkinter.getbusywaitinterval()/1000
time.sleep(max(target - time.clock(), 0))
我认为你是对的,创建我自己的“主循环”是要走的路。这样整个窗口更新,我可以拥有“停止”按钮等时髦功能。 – Evlutte
遇到此问题寻找使Tkinter循环合作的方法,如果我正确阅读最后一个代码段,我认为它不会按预期工作。 .getbusywaitinterval()似乎在我的解释器中返回一个int(= 20),并将其除以1000得到int 0.因此,除非.getbusywaitinterval()返回超过1000的任何东西,否则target永远不会增加,我怀疑它通常会如此。 修复很简单,只需将1000更改为1000.0即可执行浮点计算,最终将目标值增加到高于0的值,并且实际上会让线程休眠。 –
我写了一个快速测试,发现它总是执行一个time.sleep(0)与原始代码。不幸的是,修复此问题以执行适当的睡眠会导致睡眠持续增加,在执行后的几秒钟内达到1.5秒,这使应用程序真的很慢。离开原来的bug使得while循环运行速度非常快,并吸收了相当多的处理器周期,并等待输入。似乎没有微不足道的解决办法。 –