I want to automatically update the current time in Qstatusbar. I used mainUI thread for displaying time and subthreads for other long-running tasks. This is working fine.
Now, I would like to use the subthread for displaying time. As shown below, when I click on button 3, the time is frozen while clicking on buttons 1 and button 2 the time is running.
import time
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
class WorkerSignals(QObject):
finished = pyqtSignal()
result = pyqtSignal(object)
class Worker(QRunnable):
def __init__(self, fn, *args, **kwargs):
super(Worker, self).__init__()
self.fn = fn
self.args = args
self.kwargs = kwargs
self.signals = WorkerSignals()
def run(self):
result = self.fn(*self.args, **self.kwargs)
self.signals.result.emit(result)
self.signals.finished.emit()
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.threadpool = QThreadPool()
self.set_main_layout()
self.show_current_time()
def set_main_layout(self):
self.layout = QVBoxLayout()
self.progress_bar = QProgressBar()
self.progress_bar.setValue(0)
self.btn1 = QPushButton('Sleep with thread')
self.btn1.clicked.connect(self.btn1_onclick)
self.btn2 = QPushButton('Sum with thread')
self.btn2.clicked.connect(self.btn2_onclick)
self.btn3 = QPushButton('Sleep without thread')
self.btn3.clicked.connect(self.btn3_onclick)
self.layout.addWidget(self.btn1)
self.layout.addWidget(self.btn2)
self.layout.addWidget(self.btn3)
w = QWidget()
w.setLayout(self.layout)
self.setCentralWidget(w)
self.status_bar = self.statusBar()
self.status_bar.showMessage('Ready')
self.time = QLabel()
self.status_bar.addPermanentWidget(self.time)
self.setStatusBar(self.status_bar)
def show_current_time(self):
self.timer = QTimer()
self.timer.setInterval(1000)
self.timer.timeout.connect(lambda: self.time.setText(QTime.currentTime().toString("hh:mm:ss")))
self.timer.start()
def btn1_onclick(self):
worker = Worker(self.btn1_fn)
worker.signals.result.connect(self.btn1_result)
worker.signals.finished.connect(lambda: print('Btn1 finished...'))
self.threadpool.start(worker)
def btn1_fn(self):
i = 0
while i < 5:
print(f'Btn1 sleeping...{i}')
time.sleep(1)
i += 1
return i
def btn1_result(self,i):
pass
def btn2_onclick(self):
worker = Worker(self.btn2_fn)
worker.signals.result.connect(self.btn2_result)
worker.signals.finished.connect(lambda: print('Btn2 finished...'))
self.threadpool.start(worker)
def btn2_fn(self):
sum=0
print('Btn2 summing...')
for i in range(50000000):
sum+=1
return sum
def btn2_result(self, num):
print(f'Btn2 sum: {num}')
def btn3_onclick(self):
i=0
while i<5:
print(f'Btn3 sleeping...{i}')
time.sleep(1)
i+=1
if __name__ == "__main__":
app = QApplication([])
window = MainWindow()
window.show()
app.exec_()
