为什么按几个按钮后我的应用程序会滞后？

Question

我正在使用 PyQt 和按钮进行简单的基于文本的冒险。出于某种原因，单击几个按钮后，在刷新屏幕之前单击按钮会出现一些严重的延迟。为什么会这样？因为我不知道 是什么导致了这个问题，我将复制整个 ~100 行程序...

import sys, time
from PyQt4 import QtGui, QtCore

class Window(QtGui.QMainWindow):

    def __init__(self):
        super(Window, self).__init__()
        self.setGeometry(50, 50, 600, 400)
        self.setWindowTitle("Omar OK Adventures!")

        QtGui.QApplication.setStyle(QtGui.QStyleFactory.create("plastique"))

        self.home()

    def home(self):
        btn1 = QtGui.QPushButton("New Game", self)
        btn1.clicked.connect(self.change)
        btn1.resize(500, 25)
        btn1.move(50, 275)
        self.btn1 = btn1

        btn2 = QtGui.QPushButton("What's this all about?", self)
        btn2.clicked.connect(self.wat)
        btn2.resize(500, 25)
        btn2.move(50, 305)
        self.btn2 = btn2

        btn3 = QtGui.QPushButton("...", self)
        btn3.resize(500, 25)
        btn3.move(50, -200)
        self.btn3 = btn3

        btn4 = QtGui.QPushButton("...", self)
        btn4.resize(500, 25)
        btn4.move(50, -200)
        self.btn4 = btn4

        txt = "Welcome to the main menu! (WIP obviously)"
        lbl = QtGui.QLabel(txt, self)
        lbl.resize(500, 200)
        lbl.move(50, 25)
        lbl.setAlignment(QtCore.Qt.AlignCenter)
        self.lbl = lbl
        self.show()

    def homefake(self):
        self.btn1.setText("Begin teh epic adventures")
        self.btn1.clicked.connect(self.change)
        self.btn2.setText("What's this all about?")
        self.btn2.clicked.connect(self.wat)
        self.btn2.move(50,305)
        self.btn3.move(50, -200)
        self.btn4.move(50, -200)
        self.lbl.setText("Welcome to the main menu! (WIP obviously)")

    def close_application(self):
        choice = QtGui.QMessageBox.question(self, "Gemme outta here!",
                                            "Do you really want to quit?",
                                            QtGui.QMessageBox.Yes | QtGui.QMessageBox.No)
        if choice == QtGui.QMessageBox.Yes:
            sys.exit()
        else:
            pass

    def closeEvent(self, event):
        event.ignore()
        self.close_application()

    def C1_1(self):
        self.lbl.setText("You tell your parents that you're going to Japan to get some 'stuff'\nThey tell you to be back at dinner\nOk.\nYou buy a plane ticket and board the plane\nYou realize boarding the plane is boring as hell.\nWhat should you do to kill time?")
        self.btn1.setText("Take over the plane (Try not to crash it horribly)")
        self.btn1.clicked.connect(self.C2_1)
        self.btn2.setText("Watch a movie on the not-tablet stuck on a chair infront of you (Really, it's a tablet stuck on a chair.)")
        self.btn2.move(50, 305)
        self.btn2.clicked.connect(self.C2_2)
        self.btn3.move(50, -200)
        self.btn4.move(50, -200)

    def C2_1(self):
        self.btn1.setText("Restart game")
        self.btn1.clicked.connect(self.homefake)
        self.btn2.move(50, -200)
        self.lbl.setText("You pull out your combat shotgun and tell everyone to freeze and go on the floor.\nNeedless to say, people are screaming.\nSome guy tried to tackle you\nYou shot him\nSome air police jackass lands a headshot on you while you were looking away\nYou died.\n\nGood job.")

    def C2_2(self):
        self.lbl.setText('lol')

    def C1_2(self):
        self.lbl.setText("ARMED MEN")

    def C1_3(self):
        self.lbl.setText("TAKIN A HIKE")

    def C1_4(self):
        self.lbl.setText("HORSE TIME")

    def wat(self):
        self.lbl.setText("What's this?\nThis is pretty much a 5 minute (or so) test to see the capabilities of text based adventures.\n I'll probably be doing stuff much better later on. Keep an eye out!\nI probably won't replace this even if it's a joke program. Just because.\n\nCreated by popcar2")
        self.btn1.setText("Back to main menu")
        self.btn2.move(50, -200)
        self.btn1.clicked.connect(self.homefake)

    def change(self, txt):
        self.lbl.setText("You're sitting at home, incredibly bored as usual.\nHowever... You decided to do something new in your okeil life...\nA few ideas pop up in your head, what do you wanna do?")
        self.btn1.setText("Go steal whatever's nuclear in one of Japan's nuclear power plants (Diseases might be included)")
        self.btn2.move(50, 305)
        self.btn2.setText("Hire a group of armed men and take over the school (Be sure to tie kids as hostages)")
        self.btn3.move(50, 335)
        self.btn3.setText("Take a walk (TAKE A HIKE, MATE)")
        self.btn4.move(50, 365)
        self.btn4.setText("Steal a horse (The only logical option)")
        self.btn1.clicked.connect(self.C1_1)
        self.btn2.clicked.connect(self.C1_2)
        self.btn3.clicked.connect(self.C1_3)
        self.btn4.clicked.connect(self.C1_4)
def run():
    app = QtGui.QApplication(sys.argv)
    GUI = Window()
    sys.exit(app.exec_())
run()

Answer 1

当您进行信号连接 (btnX.clicked.connect()) 时，这不会自动断开之前连接的插槽。因此，随着您在游戏中的进行，每次单击按钮实际上都在执行已连接到它的每个方法，随着越来越多的方法连接到每个按钮的单击信号，该方法开始变得越来越慢。

在与 btnX.clicked.connect(new_slot) 建立新连接之前，您需要先调用 btnX.clicked.disconnect(previous_slot)。

这就需要你在连接下一个方法的时候，知道之前连接的是哪个slot（需要参考方法名）。我没有遵循您的程序逻辑来了解这有多简单，但这是您需要做的。否则你将需要采取不同的方法，不需要更改按钮连接到的插槽（例如使用堆叠小部件在不同的按钮组之间切换，或类似）

为什么按几个按钮后我的应用程序会滞后？

Why does my application lag after pressing a few buttons?

python

pyqt

pyqt4

python-3.x