我正在尝试在选择PyQt窗口的“X”关闭按钮时调用一个方法。坦率地说，我有一个对象QtGui.QWidget的类，我希望它在使用“X”关闭按钮关闭窗口时调用其中一个方法，以便包装一些子进程。怎么可以这样做？
代码如下所示。我想要调用的类interface的方法是stylusProximityControlOff()。这个方法终止了一个可能有点乱的子进程，但这是一个单独的问题。
无论如何，我很感激有关在选择“X”时调用该方法的建议。
#!/usr/bin/env python
"""
spin, a small utility to assist in setting usage modes of laptop-tablet devices
Usage:
spin.py
spin.py -h | --help
spin.py --nogui
Options:
-h,--help : show this help message
--nogui : non-GUI mode
"""
from docopt import docopt
import os
import sys
import subprocess
from multiprocessing import Process
import time
from PyQt4 import QtGui
import logging
# logging
logger = logging.getLogger(__name__)
logging.basicConfig()
logger.level = logging.INFO
class interface(QtGui.QWidget):
def __init__(
self,
docopt_args=None
):
self.docopt_args=docopt_args
super(interface, self).__init__()
logger.info("running spin")
# engage stylus proximity control
self.stylusProximityControlOn()
if not docopt_args["--nogui"]:
# create buttons
buttonsList = []
# button: tablet mode
buttonModeTablet = QtGui.QPushButton('tablet mode', self)
buttonModeTablet.clicked.connect(self.engageModeTablet)
buttonsList.append(buttonModeTablet)
# button: laptop mode
buttonModeLaptop = QtGui.QPushButton('laptop mode', self)
buttonModeLaptop.clicked.connect(self.engageModeLaptop)
buttonsList.append(buttonModeLaptop)
# button: left
buttonLeft = QtGui.QPushButton('left', self)
buttonLeft.clicked.connect(self.engageLeft)
buttonsList.append(buttonLeft)
# button: right
buttonRight = QtGui.QPushButton('right', self)
buttonRight.clicked.connect(self.engageRight)
buttonsList.append(buttonRight)
# button: inverted
buttonInverted = QtGui.QPushButton('inverted', self)
buttonInverted.clicked.connect(self.engageInverted)
buttonsList.append(buttonInverted)
# button: normal
buttonNormal = QtGui.QPushButton('normal', self)
buttonNormal.clicked.connect(self.engageNormal)
buttonsList.append(buttonNormal)
# button: touchscreen on
buttonTouchscreenOn = QtGui.QPushButton('touchscreen on', self)
buttonTouchscreenOn.clicked.connect(self.engageTouchscreenOn)
buttonsList.append(buttonTouchscreenOn)
# button: touchscreen off
buttonTouchscreenOff = QtGui.QPushButton('touchscreen off', self)
buttonTouchscreenOff.clicked.connect(self.engageTouchscreenOff)
buttonsList.append(buttonTouchscreenOff)
# button: touchpad on
buttonTouchpadOn = QtGui.QPushButton('touchpad on', self)
buttonTouchpadOn.clicked.connect(self.engageTouchpadOn)
buttonsList.append(buttonTouchpadOn)
# button: touchpad off
buttonTouchpadOff = QtGui.QPushButton('touchpad off', self)
buttonTouchpadOff.clicked.connect(self.engageTouchpadOff)
buttonsList.append(buttonTouchpadOff)
# button: nipple on
buttonNippleOn = QtGui.QPushButton('nipple on', self)
buttonNippleOn.clicked.connect(self.engageNippleOn)
buttonsList.append(buttonNippleOn)
# button: nipple off
buttonNippleOff = QtGui.QPushButton('nipple off', self)
buttonNippleOff.clicked.connect(self.engageNippleOff)
buttonsList.append(buttonNippleOff)
# button: stylus proximity on
buttonStylusProximityControlOn = QtGui.QPushButton('stylus proximity on', self)
buttonStylusProximityControlOn.clicked.connect(self.engageStylusProximityControlOn)
buttonsList.append(buttonStylusProximityControlOn)
# button: stylus proximity off
buttonStylusProximityControlOff = QtGui.QPushButton('stylus proximity off', self)
buttonStylusProximityControlOff.clicked.connect(self.engageStylusProximityControlOff)
buttonsList.append(buttonStylusProximityControlOff)
# set button dimensions
buttonsWidth=150
buttonsHeight=60
for button in buttonsList:
button.setFixedSize(buttonsWidth, buttonsHeight)
# set layout
vbox = QtGui.QVBoxLayout()
vbox.addStretch(1)
for button in buttonsList:
vbox.addWidget(button)
vbox.addStretch(1)
self.setLayout(vbox)
# window
self.setGeometry(200, 200, 150, 100)
self.setWindowTitle('spin')
self.show()
elif docopt_args["--nogui"]:
logger.info("non-GUI mode")
def displayLeft(self):
logger.info("changing display to left")
os.system('xrandr -o left')
def displayRight(self):
logger.info("changing display to right")
os.system('xrandr -o right')
def displayInverted(self):
logger.info("changing display to inverted")
os.system('xrandr -o inverted')
def displayNormal(self):
logger.info("changing display to normal")
os.system('xrandr -o normal')
def touchscreenLeft(self):
logger.info("changing touchscreen to left")
os.system('xinput set-prop "ELAN Touchscreen" "Coordinate Transformation Matrix" 0 -1 1 1 0 0 0 0 1')
def touchscreenRight(self):
logger.info("changing touchscreen to right")
os.system('xinput set-prop "ELAN Touchscreen" "Coordinate Transformation Matrix" 0 1 0 -1 0 1 0 0 1')
def touchscreenInverted(self):
logger.info("changing touchscreen to inverted")
os.system('xinput set-prop "ELAN Touchscreen" "Coordinate Transformation Matrix" -1 0 1 0 -1 1 0 0 1')
def touchscreenNormal(self):
logger.info("changing touchscreen to normal")
os.system('xinput set-prop "ELAN Touchscreen" "Coordinate Transformation Matrix" 1 0 0 0 1 0 0 0 1')
def touchscreenOn(self):
logger.info("changing touchscreen to on")
os.system('xinput enable "ELAN Touchscreen"')
def touchscreenOff(self):
logger.info("changing touchscreen to off")
os.system('xinput disable "ELAN Touchscreen"')
def touchpadOn(self):
logger.info("changing touchpad to on")
os.system('xinput enable "SynPS/2 Synaptics TouchPad"')
def touchpadOff(self):
logger.info("changing touchpad to off")
os.system('xinput disable "SynPS/2 Synaptics TouchPad"')
def nippleOn(self):
logger.info("changing nipple to on")
os.system('xinput enable "TPPS/2 IBM TrackPoint"')
def nippleOff(self):
logger.info("changing nipple to off")
os.system('xinput disable "TPPS/2 IBM TrackPoint"')
def stylusProximityControl(self):
previousProximityStatus = None
while True:
proximityCommand = 'xinput query-state "Wacom ISDv4 EC Pen stylus" | grep Proximity | cut -d " " -f3 | cut -d "=" -f2'
proximityStatus = subprocess.check_output(proximityCommand, shell=True).lower().rstrip()
if (proximityStatus == "out") and (previousProximityStatus != "out"):
logger.info("stylus inactive")
self.touchscreenOn()
elif (proximityStatus == "in") and (previousProximityStatus != "in"):
logger.info("stylus active")
self.touchscreenOff()
previousProximityStatus = proximityStatus
time.sleep(0.25)
def stylusProximityControlOn(self):
logger.info("changing stylus proximity control to on")
self.process1 = Process(target=self.stylusProximityControl)
self.process1.start()
def stylusProximityControlOff(self):
logger.info("changing stylus proximity control to off")
self.process1.terminate()
def engageModeTablet(self):
logger.info("engaging mode tablet")
self.displayLeft()
self.touchscreenLeft()
self.touchscreenOff()
self.touchpadOff()
self.nippleOff()
def engageModeLaptop(self):
logger.info("engaging mode laptop")
self.displayNormal()
self.touchscreenNormal()
self.touchscreenOn()
self.touchpadOn()
self.nippleOn()
def engageLeft(self):
logger.info("engaging mode left")
self.displayLeft()
self.touchscreenLeft()
def engageRight(self):
logger.info("engaging mode right")
self.displayRight()
self.touchscreenRight()
def engageInverted(self):
logger.info("engaging mode inverted")
self.displayInverted()
self.touchscreenInverted()
def engageNormal(self):
logger.info("engaging mode normal")
self.displayNormal()
self.touchscreenNormal()
def engageTouchscreenOn(self):
self.touchscreenOn()
def engageTouchscreenOff(self):
self.touchscreenOff()
def engageTouchpadOn(self):
self.touchpadOn()
def engageTouchpadOff(self):
self.touchpadOff()
def engageNippleOn(self):
self.nippleOn()
def engageNippleOff(self):
self.nippleOff()
def engageStylusProximityControlOn(self):
self.stylusProximityControlOn()
def engageStylusProximityControlOff(self):
self.stylusProximityControlOff()
def main(docopt_args):
application = QtGui.QApplication(sys.argv)
interface1 = interface(docopt_args)
sys.exit(application.exec_())
if __name__ == '__main__':
args = docopt(__doc__)
main(args)
答案 0 :(得分：2)
一种方法是重新实现QWidget的closeEvent方法，让它调用连接（或终止）子进程的方法，然后让它调用deleteLater()或destroy()。< / p>
def closeEvent(self, event):
logger.info("stopping spin")
self.stylusProximityControlOff()
self.deleteLater()