我是Python新手,我正在尝试学习simpy和pyqt5。我正在制作一些程序,我想在每次迭代时更改标签颜色,但我不知道为什么它只显示 1 种颜色。
要更改颜色,我首先提到绿色,然后是黑色,但启动程序后它只显示黑色。有什么办法可以连续改变颜色。
def carParking(env, name, ps, depart_time, parking_Duration):
yield env.timeout(depart_time)
print("Car %d arrived on station at %d" % (name, env.now))
app.processEvents()
dlg.parkedCars.display(name)
app.processEvents()
dlg.lEnter.setStyleSheet('color: Green')
dlg.lEnter.setStyleSheet('color: Black')
dlg.lEnter.setStyleSheet('color: Green')
time.sleep(0.30)
with ps.request() as req:
yield req
time.sleep(0.30)
print("%d parked at %s" % (name, env.now))
yield env.timeout(parking_Duration)
time.sleep(0.30)
print("%d leaving the Parking Station at %s" % (name, env.now))
dlg.lExit.setStyleSheet('color: Red')
在上面的代码中,您可以看到颜色绿黑绿,但它不是这样工作的。它只显示一种颜色,即绿色。 剩下的代码如下
env = simpy.Environment()
ps = simpy.Resource(env, capacity=5)
def syslot(self):
#a=dlg.parkingSpace.setText(str(float(dlg.nCars.text())))
ab=int(dlg.nCars.text())
for i in range(ab):
a = randint(1, 5)
# dlg.lEnter.setStyleSheet('color: black')
# dlg.lExit.setStyleSheet('color: black')
env.process(carParking(env, i, ps, i * 2, a))
time.sleep(0.10)
print("The parking duration of Car %d is %d" % (i, a))
env.run()
app =QtWidgets.QApplication([])
dlg = uic.loadUi("design.ui")
dlg.visualize.clicked.connect(syslot)
dlg.show()
sys.exit(app.exec_())
请告诉我该怎么做才能连续改变标签颜色。预先感谢您。
最佳答案
为了让用户能够感觉到变化,它不能太快,因为视觉很慢,我们的想法是给出一个可感知的时间,例如 500 毫秒。另一方面,循环必须在另一个线程中执行,以免阻塞 GUI 并通过信号与 GUI 进行通信。
考虑到上述情况,解决方案是:
import random
import threading
import time
import simpy
from PyQt5 import QtCore, QtWidgets, uic
def car_parking(env, name, ps, depart_time, parking_duration, manager):
yield env.timeout(depart_time)
print("Car %d arrived on station at %d" % (name, env.now))
manager.valueChanged.emit(name)
manager.entered.emit()
time.sleep(0.3)
with ps.request() as rq:
yield rq
time.sleep(0.3)
print("%d parked at %s" % (name, env.now))
yield env.timeout(parking_duration)
time.sleep(0.30)
print("%d leaving the Parking Station at %s" % (name, env.now))
manager.exited.emit()
def loop(number_of_cars, manager):
env = simpy.Environment()
ps = simpy.Resource(env, capacity=5)
for i in range(number_of_cars):
t = random.randint(1, 5)
env.process(car_parking(env, i, ps, i * 2, t, manager))
time.sleep(0.3)
print("The parking duration of Car %d is %d" % (i, t))
env.run()
class Manager(QtCore.QObject):
entered = QtCore.pyqtSignal()
exited = QtCore.pyqtSignal()
valueChanged = QtCore.pyqtSignal(int)
def start(self, number_of_cars):
threading.Thread(target=loop, args=(number_of_cars, self), daemon=True).start()
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
uic.loadUi("design.ui", self)
self.manager = Manager()
self.manager.valueChanged.connect(self.parkedCars.display)
self.manager.entered.connect(self.on_entered)
self.manager.exited.connect(self.on_exited)
self.visualize.clicked.connect(self.on_clicked)
@QtCore.pyqtSlot()
def on_clicked(self):
try:
n = int(self.nCars.text())
self.manager.start(n)
except ValueError:
print("It must be an integer")
@QtCore.pyqtSlot()
def on_entered(self):
self.lEnter.setStyleSheet("color: green")
QtCore.QTimer.singleShot(500, lambda: self.lEnter.setStyleSheet("color: black"))
@QtCore.pyqtSlot()
def on_exited(self):
self.lExit.setStyleSheet("color: red")
QtCore.QTimer.singleShot(500, lambda: self.lExit.setStyleSheet("color: black"))
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())
关于python - 如何在python pyqt5中连续更改标签颜色颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58245467/