取消所有未完成的QTimer活动

Question

我正在寻找一种方法来设置pyqt中的多个定时函数调用,并在需要时取消所有挂起的调用.

我正在寻找使用QtCore.QTimer设置函数调用,但我不知道取消这些调用的任何好方法.有任何想法吗？

使用后我似乎找不到任何取消的方法QtCore.QTimer.singleShot(1000, self.function).如果我创建了一个QTimer对象列表,我可以阻止它们,但后来我被迫管理一个计时器对象列表(创建,删除,它们是活动的等等),我想避免.

# Setup a timer object.
timer = QtCore.QTimer(self)
timer.timeout.connect(self.function)
timer.setSingleShot(True)
timer.start(1000)

# To stop the timer object at some later point.
timer.stop()

我还可以管理自己的挂起函数调用队列,如果可能的话我也想避免(为了简单起见).

这是一些虚拟代码,显示了我想要做的事情:

import sys
from PyQt4 import QtCore

class Test(QtCore.QObject):

    def __init__(self, parent=None):
        QtCore.QObject.__init__(self, parent)


    def addDelayedCall(self, time, function):
        # Do something here.
        pass


    def clearPendingCalls(self):
        print('  Clearing pending function calls.')
        # Do something here.


    def setupCalls(self):
        self.addDelayedCall(500, self.dummy)
        self.addDelayedCall(1000, self.dummy)
        self.addDelayedCall(1500, self.dummy)
        self.addDelayedCall(2000, self.dummy)


    def dummy(self):
        print('dummy just got called.')


if __name__ == '__main__':
    app = QtCore.QCoreApplication(sys.argv)
    test = Test(app)

    QtCore.QTimer.singleShot(0, test.setupCalls)
    QtCore.QTimer.singleShot(1250, test.clearPendingCalls)

    QtCore.QTimer.singleShot(5000, app.quit)            
    sys.exit(app.exec_())

Answer 1

我想出了一个解决方案，直接使用QObject. 我怀疑有一个更优雅的解决方案，但这可能会满足我的需要。

import sys
from PyQt4 import QtCore


class Test(QtCore.QObject):

    def __init__(self, parent=None):
        QtCore.QObject.__init__(self, parent)

        self.timers = {}


    def timerEvent(self, event):
        function = self.timers.pop(event.timerId())
        self.killTimer(event.timerId())
        function()


    def addDelayedCall(self, time, function):
        timer_id = self.startTimer(time)

        self.timers[timer_id] = function


    def clearPendingCalls(self):
        print('  Clearing pending function calls.')

        while self.timers:
            timer_id, function = self.timers.popitem()
            self.killTimer(timer_id)


    def setupCalls(self):
        self.addDelayedCall(500, self.dummy)
        self.addDelayedCall(1000, self.dummy)
        self.addDelayedCall(1500, self.dummy)
        self.addDelayedCall(2000, self.dummy)


    def dummy(self):
        print('dummy just got called.')




if __name__ == '__main__':
    app = QtCore.QCoreApplication(sys.argv)
    test = Test(app)

    QtCore.QTimer.singleShot(0, test.setupCalls)
    QtCore.QTimer.singleShot(1250, test.clearPendingCalls)

    QtCore.QTimer.singleShot(5000, app.quit)            
    sys.exit(app.exec_())