PYQT4螺纹正确

Question

我想制作一个在线程上运行的progressbar，我希望能够在此过程中移动小部件：

import sys
from PyQt4.QtGui import QApplication, QMainWindow, QPushButton, QLineEdit, QLabel, QComboBox, QProgressBar, QFileDialog
from PyQt4.QtCore import QSize, pyqtSlot, QCoreApplication, SIGNAL, QThread
class App(QMainWindow):
    def __init__(self):
        super(App, self).__init__()
        self.setGeometry(500, 300, 820, 350)
        self.setWindowTitle("Program")
        self.initUI()
    def initUI(self):
        #Buttons
        btnposx = 30
        btnposy = 50

        self.btn4 = QPushButton('Load', self)
        self.btn4.move(btnposx,btnposy+220)       
        self.connect(self.btn4, SIGNAL("released()"), self.test)
        #ProgressBar
        self.pb = QProgressBar(self)
        self.pb.move(btnposx+150,btnposy+220)
        self.pb.resize(470,27)        
        self.show()
    def load(self, val):
        self.pb.setValue(val)
    def test(self):
        self.workThread = WorkThread()
        self.connect( self.workThread, SIGNAL('pb_update'), self.load)
        self.workThread.start()
class WorkThread(QThread):
    def __init__(self):
        super(WorkThread, self).__init__()
        QThread.__init__(self)
    def __del__(self):
        self.wait()
    @pyqtSlot()    
    def run(self):
        val = 0
        l = range(1000000)
        for i in l:
            if i < len(l):
                val += 100/len(l)           
                self.emit(SIGNAL('pb_update'), val)
        return
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    ex.show()
    sys.exit(app.exec_())

到目前为止，这有效，但确实很差。当我尝试在此过程中移动它时，小部件确实几乎不在我的机器上运行。有没有办法使此工作更好，以使小部件不会落后或停止响应？

Answer 1

您的代码可以进行的改进如下：

• 使用信号和插槽之间的新连接样式
• 您必须留出一些时间才能使辅助线程将信息发送到主线程。
• 您必须指示连接类型，在您的情况下Qt::QueuedConnection。
• 使用pyqtSlot装饰器。
• 您只需要在必要时发出信号，在您的情况下，当值的全部值变化时，因为QProgressBar无法识别浮动。

---

import sys
from PyQt4.QtGui import QApplication, QMainWindow, QPushButton, QLineEdit, QLabel, QComboBox, QProgressBar, QFileDialog
from PyQt4.QtCore import QSize, pyqtSlot, pyqtSignal, QThread, Qt
class App(QMainWindow):
    def __init__(self):
        super(App, self).__init__()
        self.setGeometry(500, 300, 820, 350)
        self.setWindowTitle("Program")
        self.initUI()
    def initUI(self):
        #Buttons
        btnposx = 30
        btnposy = 50

        self.btn4 = QPushButton('Load', self)
        self.btn4.move(btnposx,btnposy+220)       
        self.btn4.released.connect(self.test)
        #ProgressBar
        self.pb = QProgressBar(self)
        self.pb.move(btnposx+150,btnposy+220)
        self.pb.resize(470,27)        
        self.show()
    @pyqtSlot(int)
    def load(self, val):
        self.pb.setValue(val)
    def test(self):
        self.workThread = WorkThread()
        self.workThread.pb_update.connect(self.load, Qt.QueuedConnection)
        #self.workThread.pb_update.connect(self.pb.setValue)
        self.workThread.start()
class WorkThread(QThread):
    pb_update = pyqtSignal(float)
    def __init__(self, *args, **kwargs):
        QThread.__init__(self, *args, **kwargs)
        self.value = 0
    def __del__(self):
        self.wait()
    @pyqtSlot()    
    def run(self):
        val = 0
        l = range(1000000)
        for i in l:
            if i < len(l):
                val += 100/len(l)
                int_val = int(val)
                if int_val != self.value:
                    self.value = int_val     
                    self.pb_update.emit(self.value)
                    QThread.msleep(1)
        return
if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    ex.show()
    sys.exit(app.exec_())