Issue
我有一个 PyQt GUI,用户按下按钮即可启动后台线程(workerThread
,它是从QThread
)。我想要一个计时器显示(以QLabel
) 显示自此以来已经过去了多少时间workerThread
开始,我希望这个计时器在workerThread
exits.
可能的解决方案
我考虑过创建另一个独立线程(timerThread
)使用一个QTimer
向插槽发送信号以更新QLabel
在主 GUI 线程中,每 1 秒显示一次经过的时间。这timerThread
一旦收到终止信号就会退出workerThread
.
但是,我必须开始timerThread
同时WorkerThread
,我不知道该怎么做。
Question
有没有更简单的方法来做到这一点?是QTimer
甚至是正确的开始方法?
这是执行此操作的一种方法。在这个例子中,myThread
开始timerThread
作为子进程时run
方法被调用。它是timeElapsed
信号连接到timerThread
s timeElapsed
信号。这timerThread
每秒都会检查while
the parent
isRunning
并发出一个timeElapsed
信号如果True
:
#!/usr/bin/env python
#-*- coding:utf-8 -*-
import time
from PyQt4 import QtCore, QtGui
class timerThread(QtCore.QThread):
timeElapsed = QtCore.pyqtSignal(int)
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)
class myThread(QtCore.QThread):
timeElapsed = QtCore.pyqtSignal(int)
def __init__(self, parent=None):
super(myThread, self).__init__(parent)
self.timerThread = timerThread(self)
self.timerThread.timeElapsed.connect(self.timeElapsed.emit)
def run(self):
self.timerThread.start(time.time())
iterations = 3
while iterations:
print "Running {0}".format(self.__class__.__name__)
iterations -= 1
time.sleep(2)
class myWindow(QtGui.QWidget):
def __init__(self):
super(myWindow, self).__init__()
self.button = QtGui.QPushButton(self)
self.button.setText("Start Threading!")
self.button.clicked.connect(self.on_button_clicked)
self.label = QtGui.QLabel(self)
self.layout = QtGui.QVBoxLayout(self)
self.layout.addWidget(self.button)
self.layout.addWidget(self.label)
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.label.setText("Time Elapsed: {0}".format(seconds))
@QtCore.pyqtSlot()
def on_myThread_finished(self):
print "Done"
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
app.setApplicationName('myWindow')
main = myWindow()
main.show()
sys.exit(app.exec_())
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