[英]PyQt QThread MultiThreading does not work
我有2个QListWidget
列表,当从List1中选择某些项时,正在填充List2
问题是,在填充List2之前,我必须执行很多任务,这会使UI冻结约5秒钟,这太烦人了,我想让它用QThread填充List2,但由于在初始化整个类之前我无法使用它一个烦人的错误
from ui import Ui_Win
from PyQt4 import QtGui, QtCore
class GenericThread(QtCore.QThread):
def __init__(self, parent=None):
QtCore.QThread.__init__(self, parent)
def __del__(self):
self.quit()
self.wait()
def run(self):
self.emit( QtCore.SIGNAL('itemSelectionChanged()'))
return
class MainUI(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self)
self.ui = Ui_Win()
self.ui.setupUi(self)
...
genericThread = GenericThread(self)
self.connect(genericThread, QtCore.SIGNAL("itemSelectionChanged()"), self.fill_List2 )
genericThread.start()
def fill_List2(self):
self.ui.List2.clear()
list1SelectedItem = str(self.ui.List1.currentItem().text()) # ERROR HERE
# AttributeError: 'NoneType' object has no attribute 'text'
这是因为self.ui.List1.currentItem().text()
为None
为什么在触发itemSelectionChanged
信号之前调用此功能?
from ui import Ui_Win ## ui.py is a file that has been generated from Qt Designer and it contains main GUI objects like QListWidget
from PyQt4 import QtGui, QtCore
class GenericThread(QtCore.QThread):
def __init__(self, parent=None, listIndex=0):
QtCore.QThread.__init__(self, parent)
self.listIndex = listIndex
def __del__(self):
self.quit()
self.wait()
def run(self):
if self.listIndex == 2:
for addStr in Something:
#Some long stuff
self.emit( QtCore.SIGNAL('fillListWithItems(QString, int'), addStr, self.listIndex)
class MainUI(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self)
self.ui = Ui_Win()
self.ui.setupUi(self)
...
self.ui.List1.list1SelectedItem.connect(self.fill_List2)
@QtCore.pyqtSlot(QString, int)
def self.fillListWithItems(addStr, lstIdx):
if lstIdx==2:
self.ui.List2.addItem(addStr)
def fill_List2(self):
self.ui.List2.clear()
list1SelectedItem = str(self.ui.List1.currentItem().text())
genericThread = GenericThread(self, listIndex=2)
self.connect(genericThread, QtCore.SIGNAL("fillListWithItems(QString, int)"), self.fillListWithItems )
genericThread.start()
谢谢@ekhumoro
您的问题是,简单地启动线程会触发itemSelectionChanged()
信号(因为它在run
函数中),该信号已连接到fill_List2()
函数。 您需要将List1
上的itemSelectionChanged
事件连接到一个SLOT
,该事件将触发线程进行大量计算并更新List2
。
我必须对ui
是什么以及List1
和List2
是什么以及它们的设置方式做出一些假设,但这是一个有效的示例。 我已经用2秒的简单延迟替换了GenericThread
的繁重计算。
如果我误解了/做出了错误的假设,请更新问题并发表评论
from ui import Ui_Win
from PyQt4 import QtGui, QtCore
from PyQt4.QtCore import pyqtSlot
from PyQt4.QtGui import *
import time
class GenericThread(QtCore.QThread):
def __init__(self, parent=None):
QtCore.QThread.__init__(self, parent)
def __del__(self):
self.quit()
self.wait()
def run(self):
#Do all your heavy processing here
#I'll just wait for 2 seconds
time.sleep(2)
self.emit( QtCore.SIGNAL('itemSelectionChanged()'))
return
class MainUI(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self)
self.ui = Ui_Win()
self.ui.setupUi(self)
self.ui.List1 = QListWidget(self)
self.ui.List2 = QListWidget(self)
hbox = QtGui.QHBoxLayout()
hbox.addStretch(1)
hbox.addWidget(self.ui.List1)
hbox.addWidget(self.ui.List2)
self.ui.centralWidget.setLayout(hbox)
self.ui.List1.addItems(['alpha','beta','gamma','delta','epsilon'])
self.ui.List2.addItems(['Item1','Item2'])
self.ui.List1.itemSelectionChanged.connect(self.start_heavy_processing_thread)
@pyqtSlot()
def start_heavy_processing_thread(self):
genericThread = GenericThread(self)
self.connect(genericThread, QtCore.SIGNAL("itemSelectionChanged()"), self.fill_List2 )
genericThread.start()
def fill_List2(self):
self.ui.List2.clear()
list1SelectedItem = str(self.ui.List1.currentItem().text())
self.ui.List2.addItem(list1SelectedItem)
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
MainWindow = MainUI()
MainWindow.show()
sys.exit(app.exec_())
from PyQt4 import QtCore, QtGui
class Ui_Win(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(416, 292)
self.centralWidget = QtGui.QWidget(MainWindow)
self.centralWidget.setObjectName("centralWidget")
MainWindow.setCentralWidget(self.centralWidget)
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
MainWindow = QtGui.QMainWindow()
ui = Ui_Win()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
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