Question

我有一个有3个不同窗口的应用程序。其中一个包括：

开始按钮

停止按钮

LCDNumber显示

当我按下开始按钮时，计时器启动并且LCDNumber显示屏上显示已用时间。然而，当我按下停止时，整个GUI卡住，没有任何作用，没有按钮等。我知道这是因为此代码中使用的while循环。但是我不知道如何使用while循环有效地停止工作线程。请给我一些提示，也许解决我的问题。

TimerWindow实例在 main 中创建。正如您所见，TimerWindow构造函数创建了一个myThread类实例。 myThread类实例创建timerThread类实例。我希望你看这段代码时很明显。如果你需要完整的代码，请在评论中告诉我，我会发布:) 我的代码基于this example

按钮连接到以下方法：

QtCore.QObject.connect(self.STARTbutton, QtCore.SIGNAL(_fromUtf8("clicked()")), TimerWindow.on_button_clicked)
QtCore.QObject.connect(self.STOPbutton, QtCore.SIGNAL(_fromUtf8("clicked()")), TimerWindow.on_myThread_finished)

以下是课程

class TimerWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self,parent)
        self.ui_timer = Ui_TimerWindow() #create instance of Ui_TimerWindow
        self.ui_timer.setupUi(self) #call setupUi which will create all the GUI elements

        self.myThread = myThread(self)
        self.myThread.timeElapsed.connect(self.on_myThread_timeElapsed)
        self.myThread.finished.connect(self.on_myThread_finished)

    @QtCore.pyqtSlot()
    def on_button_clicked(self):
        self.myThread.start()

    @QtCore.pyqtSlot(int)
    def on_myThread_timeElapsed(self, seconds):
        self.ui_timer.lcdNumber.display(seconds)

    @QtCore.pyqtSlot()
    def on_myThread_finished(self):
        self.myThread.terminate()
        print "Done"

东西

class myThread(QtCore.QThread):
    """this is the main thread class called when we want to create a timer"""

    timeElapsed = QtCore.pyqtSignal(float)
    def __init__(self, parent=None):
        super(myThread, self).__init__(parent)

        self.timerThread = timerThread(self) #create an instance of timerThread class
        self.timerThread.timeElapsed.connect(self.timeElapsed.emit)

    def run(self):
        self.timerThread.start(time.time())

        iterations = 10000000000
        while iterations:
            print "Running {0}".format(self.__class__.__name__)
            iterations -= 1
            time.sleep(100)

class timerThread(QtCore.QThread):
    """instance of this class i created when myThread class object is created and myThread's class constructor is used"""
    timeElapsed = QtCore.pyqtSignal(float)

    def __init__(self, parent=None):
        super(timerThread, self).__init__(parent)
        self.timeStart = None

    def start(self, timeStart):
        self.timeStart = timeStart

        return super(timerThread, self).start()

    def run(self):
        while self.parent().isRunning():
            self.timeElapsed.emit(time.time() - self.timeStart)
            time.sleep(1)

在PyQt4中停止计时器

0 个答案: