我只是不知道如何正确使用QThreads。我有一个工作器对象，以及一个有两个组合框的gui：当用户在comboWorkspace上选择一个项目时，comboModel上的项目将加载。发生的事情是，每当我从comboWorkspace中选择时，它将再次从worker中运行get_workspaces函数。这可能是因为我一遍又一遍地调用QThread的“启动”功能。如果这里有很多错误，我感到很抱歉。如果有人可以给马一个想法，如何正确地解决这个问题。非常感谢！
*带有setupUi功能的完整代码在这里：pastebin.com/Y7dGbRLu
from PyQt5 import QtCore, QtGui, QtWidgets
import os
import time
from functools import partial
import copy
class anaplanWorker(QtCore.QObject):
signal_workspacenames = QtCore.pyqtSignal(str)
signal_modelnames = QtCore.pyqtSignal(str)
finish_progressbar = QtCore.pyqtSignal()
start_progressbar = QtCore.pyqtSignal()
finish_workspace_thread = QtCore.pyqtSignal()
finish_model_thread = QtCore.pyqtSignal()
count_run = 0
def __init__(self, parent=None):
QtCore.QThread.__init__(self, parent)
def get_workspaces(self):
ws_names = ['Name One', 'Name Two', 'Name Three']
self.start_progressbar.emit()
for ws_name in ws_names:
self.signal_workspacenames.emit(ws_name)
self.finish_workspace_thread.emit()
def get_models(self,workspaceindex):
self.start_progressbar.emit()
models = ['Model One', 'Model Two', 'Model Three']
for model_name in models:
self.signal_modelnames.emit(model_name)
self.finish_model_thread.emit()
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
"""ui setup for combo combo boxes: comboWorkspace and comboModel"""
def progress_start(self):
print("start")
def progress_finish(self):
print("finish")
#workspace functions
def add_workspace(self, workspace_name):
self.comboWorkspace.addItem(workspace_name)
def start_workspace(self):
self.comboWorkspace.clear()
self.workspace_thread = self.anaplan_thread
self.anaplan_worker.moveToThread(self.workspace_thread)
self.workspace_thread.started.connect(self.anaplan_worker.get_workspaces)
self.workspace_thread.start()
#model functions
def add_model(self, model_name):
self.comboModel.addItem(model_name)
def start_model(self):
#clear combomodel
self.comboModel.clear()
workspaceIndex = self.comboWorkspace.currentIndex()
self.model_thread = self.anaplan_thread
self.anaplan_worker.moveToThread(self.model_thread)
self.model_thread.started.connect(partial(self.anaplan_worker.get_models, workspaceIndex))
self.model_thread.start()
#quit threads
def quit_model_thread(self):
self.model_thread.quit()
print("quit model thread")
def quit_workspace_thread(self):
self.workspace_thread.quit()
print("quit workspace thread")
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "Tool"))
self.labelWorkspace.setText(_translate("MainWindow", "Workspace"))
self.labelModel.setText(_translate("MainWindow", "Model"))
self.anaplan_worker = anaplanWorker()
self.anaplan_thread = QtCore.QThread()
self.anaplan_worker.signal_workspacenames.connect(self.add_workspace)
self.anaplan_worker.signal_modelnames.connect(self.add_model)
self.anaplan_worker.finish_workspace_thread.connect(self.quit_workspace_thread)
self.anaplan_worker.finish_model_thread.connect(self.quit_model_thread)
self.comboWorkspace.activated[str].connect(self.start_model)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
ui.start_workspace()
sys.exit(app.exec_())
答案 0 :(得分：0)
您应该进一步拆分代码。它将解决您的很多问题。
您有两个主要问题：每次更改索引时都要重新设置信号/插槽连接（一个连接表示一个呼叫）。您将同一线程用于两项不同的任务。
您应该创建一个新的类MainWindow并在其中移动业务逻辑。您的Ui_MainWindow类应仅处理UI部件（小部件，布局等）。
您的anaplanWorker有很多问题：它是QObject的继承人，但却调用QThread.__init__，您用它创建线程和对象 worker 。直接使用QThread会更清楚。
该类也应分为两个不同的部分：一个用于工作空间，另一个用于模型：
class ModelWorker(QtCore.QObject):
signal_modelnames = QtCore.pyqtSignal(str)
finish_progressbar = QtCore.pyqtSignal()
start_progressbar = QtCore.pyqtSignal()
finish_model_thread = QtCore.pyqtSignal()
def __init__(self, parent=None):
super().__init__(parent)
def get_models(self,workspaceindex):
print("Get models with", workspaceindex)
self.start_progressbar.emit()
models = ['Model One', 'Model Two', 'Model Three']
for model_name in models:
self.signal_modelnames.emit(model_name)
self.finish_model_thread.emit()
class WorkspaceWorker(QtCore.QObject):
signal_workspacenames = QtCore.pyqtSignal(str)
finish_progressbar = QtCore.pyqtSignal()
start_progressbar = QtCore.pyqtSignal()
finish_workspace_thread = QtCore.pyqtSignal()
finish_model_thread = QtCore.pyqtSignal()
def __init__(self, parent=None):
super().__init__(parent)
def get_workspaces(self):
ws_names = ['Name One', 'Name Two', 'Name Three']
self.start_progressbar.emit()
for ws_name in ws_names:
self.signal_workspacenames.emit(ws_name)
self.finish_workspace_thread.emit()
然后，在MainWindow类中，创建并设置线程和连接。您只需要在需要时启动线程即可。
class MainWindow(QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.setupUi(self)
self.workspaceWorker = WorkspaceWorker()
self.modelWorker = ModelWorker()
self.workspaceWorker_thread = QThread(self)
self.modelWorker_thread = QThread(self)
self.workspaceWorker.moveToThread(self.workspaceWorker_thread)
self.modelWorker.moveToThread(self.modelWorker_thread)
self.workspaceWorker.signal_workspacenames.connect(self.add_workspace)
self.workspaceWorker.finish_workspace_thread.connect(self.quit_workspace_thread)
self.modelWorker.signal_modelnames.connect(self.add_model)
self.modelWorker.finish_model_thread.connect(self.quit_model_thread)
self.comboWorkspace.activated[str].connect(self.start_model)
self.modelWorker_thread.started.connect(lambda: self.modelWorker.get_models(self.comboWorkspace.currentIndex()))
self.workspaceWorker_thread.started.connect(self.workspaceWorker.get_workspaces)
self.start_workspace()
def add_workspace(self, workspace_name):
self.comboWorkspace.addItem(workspace_name)
def start_workspace(self):
self.comboWorkspace.clear()
self.workspaceWorker_thread.start()
#model functions
def add_model(self, model_name):
self.comboModel.addItem(model_name)
def start_model(self):
#clear combomodel
self.comboModel.clear()
self.modelWorker_thread.start()
#quit threads
def quit_model_thread(self):
self.modelWorker_thread.quit()
print("quit model thread")
def quit_workspace_thread(self):
self.workspaceWorker_thread.quit()
print("quit workspace thread")