Python PySide和进度栏线程 [英] Python PySide and Progress Bar Threading
问题描述
我有此代码:
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.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_())
我希望进度条位于单独的线程中，因此它不会冻结应用程序，但我似乎找不到解决方法.
I want to have the progress bar in a separate thread, so it doesn't freeze up the application, but I can't seem to find how to do so.
任何人都可以帮忙吗?
推荐答案
我认为您可能会误会.您希望将您正在执行的工作放在单独的线程中，以免冻结应用程序.但是您还希望能够更新进度条.您可以通过使用QThread创建辅助类来实现此目的. QThread能够发出信号，您的UI可以侦听并采取适当的行动.
I think you may be mistaken. You want the work you're doing in a separate thread so it doesn't freeze the application. But you also want to be able to update the progress bar. You can achieve this by creating a worker class using a QThread. QThreads are able emit signals, which your UI can listen for and act appropriately.
首先，让我们创建您的worker类.
First, let's create your worker class.
#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)
现在您有了一个工人阶级，现在是时候使用它了.您将要在Ui_Dialog类中创建一个新函数来处理发出的信号.
So now that you have a worker class, it's time to make use of it. You will want to create a new function in your Ui_Dialog class to handle the emitted signals.
def setProgress(self, progress):
self.progressBar.setValue(progress)
在那里，您可以删除progress()函数.
While you're there, you can remove your progress() function.
在retranslateUi()中，您将需要从以下位置更新按钮事件处理程序
in retranslateUi() you will want to update the push button event handler from
self.pushButton.clicked.connect(self.progress)
到
self.pushButton.clicked.connect(self.worker.start)
最后，在您的setupUI()函数中，您需要创建一个worker类的实例，并将其信号连接到您的setProgress()函数.
Finally, in your setupUI() function, you will need to create an instance of your worker class and connect it's signal to your setProgress() function.
在此之前:
self.retranslateUi(Dialog)
添加此内容:
self.worker = Worker()
self.worker.updateProgress.connect(self.setProgress)
这是最终代码:
Here is the final code:
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_())
QThreads具有一些内置的信号，这些信号会自动发出.您可以在文档中看到它们，以及有关QThreads的更多信息
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