关闭事件不称为键盘事件和消息框

Question

我使用QT Designer编程一个GUI，并希望使用ESC-Key禁用关闭事件。用户可以在顶部使用 X 关闭应用程序，但不能使用任何密钥。

函数关闭事件(自身，事件)不起作用。

def closeEvent(self, event):
close = QMessageBox()
close.setText("You sure?")
close.setStandardButtons(QMessageBox.Yes | QMessageBox.Cancel)
close = close.exec()
if close == QMessageBox.Yes:
event.accept()
else:
event.ignore()

该函数在我的主类上：类Ui_Tool(对象)

class Ui_LabelTool(object):
def setupUi(self, LabelTool):
Tool.setObjectName("Tool")
Tool.resize(650, 569)
Tool.setMinimumSize(QtCore.QSize(650, 569))
Tool.setMaximumSize(QtCore.QSize(650, 569))
Tool.setAutoFillBackground(False)
Tool.setSizeGripEnabled(False)
...
#Events for Buttons
self.SelectFolder.clicked.connect(self.setfolder)   
self.SelectOutputFolder.clicked.connect(self.SetOutputFolder)       
self.LoadeMeasurement.clicked.connect(self.LoadRecording)           
self.StartButton.clicked.connect(self.startProcessing)              
self.Next_btn.clicked.connect(self.nextOperation)                   
self.Prev_Btn.clicked.connect(self.prefOperation)                   
self.Reset_btn.clicked.connect(self.resetApp)
self.treeView.clicked.connect(self.ClickMeasurement) 
self.treeWidget.clicked.connect(self.CheckTopicSelect)              
self.horizontalSlider.valueChanged.connect(self.SliderValueChange)
self.horizontalSlider.sliderMoved.connect(self.dispSlider)
self.BBObject_btn.clicked.connect(self.CreateBBObj)
self.BBNoObject_btn.clicked.connect(self.CreateBBNoObj)
self.ShowAll_btn.clicked.connect(self.SaveImages)
def retranslateUi(self, LabelTool):
_translate = QtCore.QCoreApplication.translate
Tool.setWindowTitle(_translate("Tool", "Tool"))
self.LoadeMeasurement.setText(_translate("Tool", "Load Measurement"))
self.StartButton.setText(_translate("Tool", "Start "))
self.Reset_btn.setText(_translate("Tool", "Reset"))
self.Header_lbl.setText(_translate("Tool", "Test"))
...

这是我的主要功能：

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
Tool = QtWidgets.QDialog()
ui = Ui_Tool()
ui.setupUi(Tool)
Tool.show()
sys.exit(app.exec_())

我做错了什么？

我添加以下类：

class Logic(QMainWindow, Ui_Tool):
def __init__(self, *args, **kwargs):
QMainWindow.__init__(self, *args, **kwargs)
self.setupUi(self)
def closeEvent(self, event):
answer = QtWidgets.QMessageBox.question(
self,
'Are you sure you want to quit ?',
'Task is in progress !',
QtWidgets.QMessageBox.Yes,
QtWidgets.QMessageBox.No)
if answer == QtWidgets.QMessageBox.Yes:
event.accept()
else:
event.ignore()

Answer 1

如果文档已审核：

转义键

如果用户在对话框中按 Esc 键，QDialog：：reject() 将是 叫。这将导致窗口关闭：关闭事件不能 忽视。

所以有2种可能的解决方案：

1. 重写 keyPressEvent() 方法，当你按下esc键时，调用 close()。

2. 覆盖 reject() 方法以验证 QMessageBox，并根据它制定其逻辑。

除了这个实现之外，你必须在 widget 中执行此操作，而不是在 Qt Designer⁽¹⁾生成的类中执行此操作，考虑到上述两种解决方案的实现都是：

1.

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_LabelTool(object):
def setupUi(self, Tool):
Tool.setObjectName("Tool")
Tool.resize(650, 569)
Tool.setMinimumSize(QtCore.QSize(650, 569))
Tool.setMaximumSize(QtCore.QSize(650, 569))
Tool.setAutoFillBackground(False)
Tool.setSizeGripEnabled(False)
# ....

class LabelTool(QtWidgets.QDialog, Ui_LabelTool):
def __init__(self, parent=None):
super(LabelTool, self).__init__(parent)
self.setupUi(self)
def verify_by_user(self):
answer = QtWidgets.QMessageBox.question(
self,
"Are you sure you want to quit ?",
"Task is in progress !",
QtWidgets.QMessageBox.Yes,
QtWidgets.QMessageBox.No,
)
return answer == QtWidgets.QMessageBox.Yes
def keyPressEvent(self, event):
if event.key() == QtCore.Qt.Key_Escape:
self.close()
else:
super(LabelTool, self).keyPressEvent(event)
def closeEvent(self, event):
if self.verify_by_user():
event.accept()
else:
event.ignore()

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = LabelTool()
w.show()
sys.exit(app.exec_())

阿拉伯数字。

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_LabelTool(object):
def setupUi(self, Tool):
Tool.setObjectName("Tool")
Tool.resize(650, 569)
Tool.setMinimumSize(QtCore.QSize(650, 569))
Tool.setMaximumSize(QtCore.QSize(650, 569))
Tool.setAutoFillBackground(False)
Tool.setSizeGripEnabled(False)
# ....

class LabelTool(QtWidgets.QDialog, Ui_LabelTool):
def __init__(self, parent=None):
super(LabelTool, self).__init__(parent)
self.setupUi(self)
def verify_by_user(self):
answer = QtWidgets.QMessageBox.question(
self,
"Are you sure you want to quit ?",
"Task is in progress !",
QtWidgets.QMessageBox.Yes,
QtWidgets.QMessageBox.No,
)
return answer == QtWidgets.QMessageBox.Yes
def reject(self):
if self.verify_by_user():
super(LabelTool, self).reject()
def closeEvent(self, event):
if self.verify_by_user():
event.accept()
else:
event.ignore()

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = LabelTool()
w.show()
sys.exit(app.exec_())

---

^{(1) 使用生成的代码}