Long Process 中的 PYQT 和进度条

Question

我正在尝试制作一个运行的脉动进度条，在我正在运行的漫长过程中，完成后它将完全变为绿色。我在这里阅读了一些以前的 post 但我无法弄清楚我需要的线程。

import time

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName(_fromUtf8("Form"))
        Form.resize(770, 726)
        self.progressBar = QtGui.QProgressBar(Form)
        self.progressBar.setGeometry(QtCore.QRect(150, 590, 118, 23))
        self.progressBar.setProperty("value", 24)
        self.progressBar.setTextVisible(False)
        self.progressBar.setObjectName(_fromUtf8("progressBar"))

        self.pushButton = QtGui.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(25, 50, 170, 40))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.pushButton.clicked.connect(self.onStart)

        self.myLongTask = TaskThread()
        self.myLongTask.taskFinished.connect(self.onFinished)



        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def onStart(self): 
        self.progressBar.setRange(0,0)
        self.myLongTask.start()

    def onFinished(self):
        # Stop the pulsation
        self.progressBar.setRange(0,1)

    def retranslateUi(self, Form):
        Form.setWindowTitle(_translate("Form", "Form", None))
        self.pushButton.setText(_translate("Form", "Run", None))

    def test(self):
        for i in xrange(500000):
            print i

class TaskThread(QtCore.QThread):
    taskFinished = QtCore.pyqtSignal()
    def run(self):
        time.sleep(3)
        self.taskFinished.emit()  

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Form = QtGui.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

现在，条形图在跳动。它永远不会进入测试定义。我知道这是因为我没有正确调用它，但我不确定如何同时让条形图脉动和 def 测试运行。

Answer 1

test() 方法与您当前设计的进度条无关。 TaskThread.run() 方法必须在其 long-运行操作的当前进度中发出一些信号。此信号必须连接到插槽 progressBar.setValue()。因此，当 TaskThread 中的操作稍有进展时，会向进度条发送一个信号，以实际更新新进度。

这是一个大纲，为了简洁我省略了很多代码

class Ui_Form():
    __init__(self, Form):

        # Omitted

        # Connect progress of task thread with progress bar
        myLongTask.valueChanged.connect(self.progressBar.setValue)

    def onStart(self):
        # QProgressBar uses integers to represent range and value
        self.progressBar.setRange(0, 100)
        self.myLongTask.start()

class TaskThread():
    valueChanged = QtCore.pyqtSignal(int)

    def run():
        for i in range(100):
            time.sleep(0.01) # Do "work"
            self.valueChanged.emit(i) # Notify progress bar to update via signal

        self.taskFinished.emit()

Answer 2

好吧，要让 test() 方法在进度条旋转时起作用，您可以这样做：

class TaskThread(QtCore.QThread):
    taskFinished = QtCore.pyqtSignal()
    def run(self):
        # instead of sleeping do the long running loop
        for i in xrange(500000):
            print i
        self.taskFinished.emit()

并从 Ui_form 中删除 test() 方法。整个想法是你需要在另一个线程中执行长运行任务，而不是主线程处理主 window。

Long Process 中的 PYQT 和进度条

PYQT and progress Bar during Long Process

python

pyqt

pyqt4

python-2.7