Python PySide和进度条线程
我有以下代码:Python PySide和进度条线程,python,multithreading,qt,pyside,Python,Multithreading,Qt,Pyside,我有以下代码: from PySide import QtCore, QtGui import time class Ui_Dialog(object): def setupUi(self, Dialog): Dialog.setObjectName("Dialog") Dialog.resize(400, 133) self.progressBar = QtGui.QProgressBar(Dialog) self.pr
from PySide import QtCore, QtGui
import time
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(400, 133)
self.progressBar = QtGui.QProgressBar(Dialog)
self.progressBar.setGeometry(QtCore.QRect(20, 10, 361, 23))
self.progressBar.setProperty("value", 24)
self.progressBar.setObjectName("progressBar")
self.pushButton = QtGui.QPushButton(Dialog)
self.pushButton.setGeometry(QtCore.QRect(20, 40, 361, 61))
self.pushButton.setObjectName("pushButton")
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def retranslateUi(self, Dialog):
Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
self.pushButton.setText(QtGui.QApplication.translate("Dialog", "PushButton", None, QtGui.QApplication.UnicodeUTF8))
self.progressBar.setValue(0)
self.pushButton.clicked.connect(self.progress)
def progress(self):
self.progressBar.minimum = 1
self.progressBar.maximum = 100
for i in range(1, 101):
self.progressBar.setValue(i)
time.sleep(0.1)
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
Dialog = QtGui.QDialog()
ui = Ui_Dialog()
ui.setupUi(Dialog)
Dialog.show()
sys.exit(app.exec_())
我想让进度条在一个单独的线程中,这样它就不会冻结应用程序,但我似乎找不到如何做到这一点
谁能帮忙吗?我想你可能弄错了。您希望在一个单独的线程中执行所做的工作,这样它就不会冻结应用程序。但您也希望能够更新进度条。您可以通过使用
QThread
创建工人类来实现这一点。QThread能够发出信号,您的UI可以监听这些信号并进行适当的操作
首先,让我们创建worker类
#Inherit from QThread
class Worker(QtCore.QThread):
#This is the signal that will be emitted during the processing.
#By including int as an argument, it lets the signal know to expect
#an integer argument when emitting.
updateProgress = QtCore.Signal(int)
#You can do any extra things in this init you need, but for this example
#nothing else needs to be done expect call the super's init
def __init__(self):
QtCore.QThread.__init__(self)
#A QThread is run by calling it's start() function, which calls this run()
#function in it's own "thread".
def run(self):
#Notice this is the same thing you were doing in your progress() function
for i in range(1, 101):
#Emit the signal so it can be received on the UI side.
self.updateProgress.emit(i)
time.sleep(0.1)
现在你有了一个工人阶级,是时候利用它了。您需要在Ui\u对话框
类中创建一个新函数来处理发出的信号
def setProgress(self, progress):
self.progressBar.setValue(progress)
在那里,您可以删除progress()
函数
在retranslateUi()
中,您需要从更新按钮事件处理程序
self.pushButton.clicked.connect(self.progress)
到
最后,在setupUI()
函数中,您需要创建一个worker类的实例,并将其信号连接到setProgress()
函数
在此之前:
self.retranslateUi(Dialog)
添加以下内容:
self.worker = Worker()
self.worker.updateProgress.connect(self.setProgress)
以下是最终代码:
from PySide import QtCore, QtGui
import time
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(400, 133)
self.progressBar = QtGui.QProgressBar(Dialog)
self.progressBar.setGeometry(QtCore.QRect(20, 10, 361, 23))
self.progressBar.setProperty("value", 24)
self.progressBar.setObjectName("progressBar")
self.pushButton = QtGui.QPushButton(Dialog)
self.pushButton.setGeometry(QtCore.QRect(20, 40, 361, 61))
self.pushButton.setObjectName("pushButton")
self.worker = Worker()
self.worker.updateProgress.connect(self.setProgress)
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
self.progressBar.minimum = 1
self.progressBar.maximum = 100
def retranslateUi(self, Dialog):
Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
self.pushButton.setText(QtGui.QApplication.translate("Dialog", "PushButton", None, QtGui.QApplication.UnicodeUTF8))
self.progressBar.setValue(0)
self.pushButton.clicked.connect(self.worker.start)
def setProgress(self, progress):
self.progressBar.setValue(progress)
#Inherit from QThread
class Worker(QtCore.QThread):
#This is the signal that will be emitted during the processing.
#By including int as an argument, it lets the signal know to expect
#an integer argument when emitting.
updateProgress = QtCore.Signal(int)
#You can do any extra things in this init you need, but for this example
#nothing else needs to be done expect call the super's init
def __init__(self):
QtCore.QThread.__init__(self)
#A QThread is run by calling it's start() function, which calls this run()
#function in it's own "thread".
def run(self):
#Notice this is the same thing you were doing in your progress() function
for i in range(1, 101):
#Emit the signal so it can be received on the UI side.
self.updateProgress.emit(i)
time.sleep(0.1)
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
Dialog = QtGui.QDialog()
ui = Ui_Dialog()
ui.setupUi(Dialog)
Dialog.show()
sys.exit(app.exec_())
QThread具有一些自动发出的内置信号。您可以看到它们,以及有关QThreads的更多信息。如果认为您总是需要使用多线程来处理这样的事情,那就大错特错了 如果您可以将长期运行的任务分解为一系列小步骤,那么您需要做的就是确保任何挂起的事件都得到足够频繁的处理,以便GUI保持响应。这可以通过在主GUI线程中使用以下命令安全地完成:
for i in range(1, 101):
self.progressBar.setValue(i)
QtGui.qApp.processEvents()
time.sleep(0.1)
考虑到它的简单性,在选择更重的解决方案(如多线程或多处理)之前,至少应该考虑这种技术。如果不锁定GUI,这并不完美。例如,如果在更新进程栏时打开QFileDialog。它只会停止qthread,time.sleep仅用于测试目的。不适用于Qt
for i in range(1, 101):
self.progressBar.setValue(i)
QtGui.qApp.processEvents()
time.sleep(0.1)