Python PyQt：在基类中跳过“mousePressEvent”方法时，将“mousePressEvent”传递给原始小部件

我正在尝试为小部件创建一个全局上下文帮助系统。其中，可以使用ContextHelpBase类扩展所有小部件，并具有向上下文帮助显示小部件发送信号所需的所有逻辑

这个想法是，当用户点击一个小部件时，它会显示一些上下文帮助。因此，我重载了

mousePressEvent

以发送信号，但现在正常按钮和QComboBox行为不起作用，因为我假设在重写正常事件处理程序后，我没有在正常事件处理程序上传递信号

from PyQt5.QtWidgets import QApplication, QLabel, QWidget, QPushButton, QComboBox, QHBoxLayout, QVBoxLayout
from PyQt5.QtCore import QObject, pyqtSignal, pyqtSlot

class ContextHelpSignals(QObject):
    """ Used to send signals globally through the application
        Eventually will be a Global Singelton
    """
    textHelp = pyqtSignal(str)

    def __init__(self):
        super(ContextHelpSignals, self).__init__()

#Eventually will be a Global Singleton
_contextHelp = ContextHelpSignals()

class ContextHelpBaseClass(QObject):
    """All Widget that have context help inherits this class"""
    def __init__(self, **kw):
        super(ContextHelpBaseClass, self).__init__()
        self.helpText = None

    def mousePressEvent(self, event):
        """ THIS DISABLE WIDGETS NORMAL CLICK BEHAVIOR """
        _contextHelp.textHelp.emit(self.helpText)
        # How can emit a signal and then pass this event to the normal widget
        print(type(super()))

    def SetHelpText(self, helpText):
        self.helpText = helpText

class ContexHelpDisplay(QLabel):
    """Dislpay Context Help frow widgets that have Context Help"""
    def __init__(self, text):
        super(ContexHelpDisplay, self).__init__()
        self.setText(text)
        _contextHelp.textHelp.connect(self.__displayHelp)
        # Need to pass event to original widget
        # type.mousePresseEvent() - How do I get type?

    @pyqtSlot(str)
    def __displayHelp(self, contextHelpText):
        self.setText(contextHelpText)

class ContextHelpButton(QPushButton, ContextHelpBaseClass):
    """QPush Button with Context Help"""
    def __init__(self, text):
        super(ContextHelpButton, self).__init__()
        self.setText(text)
        self.helpText = "This is QPushButton Context Help Text"

## It would be nice if I could use a Python Decorator, but
## don't know how yet.
## @ContextHelp
class ContextHelpComboBox(QComboBox, ContextHelpBaseClass):
    """QPush Button with Context Help"""
    def __init__(self):
        super(ContextHelpComboBox, self).__init__()
        self.helpText = "This is QComboBox Context Help Text"

class MainWindow(QWidget):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUI()

    def setupUI(self):
        self.resize(250, 150)
        self.setWindowTitle('Context Help Example')
        self.show()

        button = ContextHelpButton("Test Button")

        comboBox = ContextHelpComboBox()
        comboBox.addItem("Test Item 1")
        comboBox.addItem("Test Item 2")
        comboBox.addItem("Test Item 3")

        helpTextDisplay = ContexHelpDisplay("Context Help")

        vBox = QVBoxLayout()
        vBox.addWidget(button)
        vBox.addWidget(comboBox)

        hBox = QHBoxLayout()
        hBox.addLayout(vBox)
        hBox.addWidget(helpTextDisplay)

        self.setLayout(hBox)

if __name__ == "__main__":
    app = QApplication([])
    ex = MainWindow()
    exit(app.exec_())

主要问题：

如何将鼠标按下事件传递给原始小部件

其他问题：

使用Python装饰器可以做到这一点吗

是否有更好的设计模式更适合这种情况

---

@eyllanesc对它的描述可以是这样的：

from PyQt5.QtWidgets import (QApplication, QLabel, QWidget, QPushButton, 
                             QComboBox, QHBoxLayout, QVBoxLayout)
from PyQt5.QtCore    import QObject, pyqtSignal, pyqtSlot,  QEvent, Qt


class ContextHelpSignals(QObject):
    """ Used to send signals globally through the application
        Eventually will be a Global Singelton                """
    textHelp = pyqtSignal(str)

    def __init__(self):
        super(ContextHelpSignals, self).__init__()


# Eventually will be a Global Singleton
_contextHelp = ContextHelpSignals()


class ContextHelpBaseClass(QObject):   
    """ All Widget that have context help inherits this class """
    def __init__(self, **kw):
        super(ContextHelpBaseClass, self).__init__()
        self.helpText = None

    def mousePressEvent(self, event):
        ''' THIS DISABLE WIDGETS NORMAL CLICK BEHAVIOR '''
        _contextHelp.textHelp.emit(self.helpText)
        # How can emit a signal and then pass this event to the normal widget
        print(type(super()))

    def SetHelpText(self, helpText):              # ???
        self.helpText = helpText


class ContexHelpDisplay(QLabel):
    """Dislpay Context Help frow widgets that have Context Help"""
    def __init__(self, text):
        super(ContexHelpDisplay, self).__init__()
        self.setText(text)
        _contextHelp.textHelp.connect(self.__displayHelp)
        # Need to pass event to original widget
        # type.mousePresseEvent() - How do I get type?

    @pyqtSlot(str)
    def __displayHelp(self, contextHelpText):
        self.setText(contextHelpText)

class ContextHelpButton(QPushButton, ContextHelpBaseClass):
    """QPush Button with Context Help"""
    def __init__(self, text):
        super(ContextHelpButton, self).__init__()
        self.setText(text)
        self.helpText = "This is <b>QPushButton</b> Context Help Text"


class ContextHelpComboBox(QComboBox):             # - --> , ContextHelpBaseClass):
    """QPush Button with Context Help"""
    def __init__(self):
        super(ContextHelpComboBox, self).__init__()
        self.helpText = "This is <b>QComboBox</b> Context Help Text"


class MainWindow(QWidget):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUI()

    def setupUI(self):
        self.resize(250, 150)
        self.setWindowTitle('Context Help Example')
        self.show()

        button = ContextHelpButton("Test Button")

        self.comboBox = ContextHelpComboBox()     # + self.
        self.comboBox.addItem("Test Item 1")
        self.comboBox.addItem("Test Item 2")
        self.comboBox.addItem("Test Item 3")

        self.comboBox.installEventFilter(self)    # <- Installs an event filter filterObj on this object. 

        self.helpTextDisplay = ContexHelpDisplay("Context Help")

        vBox = QVBoxLayout()
        vBox.addWidget(button)
        vBox.addWidget(self.comboBox)

        hBox = QHBoxLayout()
        hBox.addLayout(vBox)
        hBox.addWidget(self.helpTextDisplay)
        self.setLayout(hBox)

    # Filters events if this object has been installed as an event filter for the watched object.
    def eventFilter(self, obj, event):
        if event.type() == QEvent.MouseButtonPress and obj is self.comboBox:
            self.helpTextDisplay.setText(self.comboBox.helpText)
        return super(MainWindow, self).eventFilter(obj, event)


if __name__ == "__main__":
    app = QApplication([])
    ex  = MainWindow()
    exit(app.exec_())

从PyQt5.qtwidts导入（QApplication、QLabel、QWidget、QPushButton、，
QComboBox、QHBoxLayout、QVBoxLayout）
从PyQt5.QtCore导入QObject、pyqtSignal、pyqtlot、QEvent、Qt
类上下文帮助信号（QObject）：
“”“用于通过应用程序全局发送信号
最终将成为一名全球歌手
textHelp=pyqtSignal（str）
定义初始化（自）：
super（ContextHelpSignals，self）。\uuuu init\uuuuu（）
#最终将成为全球单身汉
_contextHelp=ContextHelpSignals（）
类ContextHelpBaseClass（QObject）：
“”“所有具有上下文帮助的小部件都继承此类”“”
def初始功率（自身功率，**kw）：
super（ContextHelpBaseClass，self）。\uuuu init\uuuu（）
self.helpText=None
def鼠标压力事件（自身、事件）：
''这将禁用小部件的正常单击行为''
_contextHelp.textHelp.emit（self.helpText）
#如何发出信号，然后将此事件传递给普通小部件
打印（键入（super（））
def SetHelpText（self，helpText）：#？？？
self.helpText=helpText
类ContexHelpDisplay（QLabel）：
“”“为具有上下文帮助的小部件显示上下文帮助”“”
定义初始化（self，text）：
super（ContexHelpDisplay，self）。\uuuu init\uuuuu（）
self.setText（文本）
_contextHelp.textHelp.connect（self.\u显示帮助）
#需要将事件传递给原始小部件
#type.mousePresseEvent（）-如何获取类型？
@pyqtSlot（str）
def_u_显示帮助（self、contextHelpText）：
self.setText（contextHelpText）
类ContextHelpButton（QPushButton，ContextHelpBaseClass）：
“”“带上下文帮助的QPush按钮”“”
定义初始化（self，text）：
super（ContextHelpButton，self）。\uuuuu init\uuuuuu（）
self.setText（文本）
self.helpText=“这是QPushButton上下文帮助文本”
类ContextHelpComboBox（QComboBox）：#--->，ContextHelpBaseClass）：
“”“带上下文帮助的QPush按钮”“”
定义初始化（自）：
超级（ContextHelpComboBox，self）。\uuuu init
self.helpText=“这是QComboBox上下文帮助文本”
类主窗口（QWidget）：
def uuu init uuu（self，parent=None）：
超级（主窗口，自我）。\uuuuu初始化\uuuuuuuuuuuuuu（父级=父级）
self.setupUI（）
def设置UI（自）：
自我调整大小（250150）
self.setWindowTitle（'上下文帮助示例'）
self.show（）
按钮=上下文帮助按钮（“测试按钮”）
self.comboBox=ContextHelpComboBox（）#+self。
self.comboBox.addItem（“测试项1”）
self.comboBox.addItem（“测试项2”）
self.comboBox.addItem（“测试项目3”）
self.comboBox.installEventFilter（self）#作为后续操作，我通过在基类中存储子类的引用，然后使用该引用传递事件来实现我想要的

from PyQt5.QtWidgets import (QApplication, QLabel, QWidget, QPushButton,
                             QComboBox, QHBoxLayout, QVBoxLayout)
from PyQt5.QtCore    import QObject, pyqtSignal, pyqtSlot

class ContextHelpSignals(QObject):
    """ Used to send signals globally through the application
        Eventually will be a Global Singleton                """
    textHelp = pyqtSignal(str)

    def __init__(self):
        super(ContextHelpSignals, self).__init__()

# Eventually will be a Global Singleton
_contextHelp = ContextHelpSignals()

class ContexHelpDisplay(QLabel):
    """Display Context Help from widgets that have Context Help"""
    def __init__(self, text):
        super(ContexHelpDisplay, self).__init__()
        self.setText(text)
        _contextHelp.textHelp.connect(self.__displayHelp)

    @pyqtSlot(str)
    def __displayHelp(self, contextHelpText):
        self.setText(contextHelpText)

class ContextHelpBaseClass(QObject):
    """ All Widget that have context help inherits this class """
    def __init__(self, childObject):
        super(ContextHelpBaseClass, self).__init__()
        self.helpText = None
        self.childObject = childObject
        print( type(childObject) )

    def mousePressEvent(self, event):
        _contextHelp.textHelp.emit(self.helpText)
        # Pass mouse click event to native widget
        self.childObject.mousePressEvent(event)

class ContextHelpButton(QPushButton, ContextHelpBaseClass):
    """QPush Button with Context Help"""
    def __init__(self, text):
        super(ContextHelpButton, self).__init__(self)
        self.setText(text)
        self.helpText = "This is <b>QPushButton</b> Context Help Text"

    def test(self):
        print("BUTTON")

class ContextHelpComboBox(QComboBox, ContextHelpBaseClass):
    """QPush Button with Context Help"""
    def __init__(self):
        super(ContextHelpComboBox, self).__init__(self)
        self.helpText = "This is <b>QComboBox</b> Context Help Text"

    def test(self):
        print("Combo Box")

class MainWindow(QWidget):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUI()

    def setupUI(self):
        self.resize(250, 150)
        self.setWindowTitle('Context Help Example')
        self.show()

        button = ContextHelpButton("Test Button")

        comboBox = ContextHelpComboBox()
        comboBox.addItem("Test Item 1")
        comboBox.addItem("Test Item 2")
        comboBox.addItem("Test Item 3")

        helpTextDisplay = ContexHelpDisplay("Context Help")

        button.clicked.connect(button.test)

        vBox = QVBoxLayout()
        vBox.addWidget(button)
        vBox.addWidget(comboBox)

        hBox = QHBoxLayout()
        hBox.addLayout(vBox)
        hBox.addWidget(helpTextDisplay)
        self.setLayout(hBox)

if __name__ == "__main__":
    app = QApplication([])
    ex  = MainWindow()
    exit(app.exec_())

从PyQt5.qtwidts导入（QApplication、QLabel、QWidget、QPushButton、，
QComboBox、QHBoxLayout、QVBoxLayout）
从PyQt5.QtCore导入QObject、pyqtSignal、pyqtSlot
类上下文帮助信号（QObject）：
“”“用于通过应用程序全局发送信号
最终将成为全球单身人士
textHelp=pyqtSignal（str）
定义初始化（自）：
super（ContextHelpSignals，self）。\uuuu init\uuuuu（）
#最终将成为全球单身汉
_contextHelp=ContextHelpSignals（）
类ContexHelpDisplay（QLabel）：
“”“从具有上下文帮助的小部件显示上下文帮助”“”
定义初始化（self，text）：
super（ContexHelpDisplay，self）。\uuuu init\uuuuu（）
self.setText（文本）
_contextHelp.textHelp.connect（self.\u显示帮助）
@pyqtSlot（str）
def_u_显示帮助（self、contextHelpText）：
self.setText（contextHelpText）
类ContextHelpBaseClass（QObject）：
“”“所有具有上下文帮助的小部件都继承此类”“”
定义初始化（self，childObject）：
super（ContextHelpBaseClass，self）。\uuuu init\uuuu（）
self.helpText=None
self.childObject=childObject
打印（类型（子对象））
def鼠标压力事件（自身、事件）：
_contextHelp.textHelp.emit（self.helpText）
#将鼠标单击事件传递给本机小部件
self.childObject.mousePressEvent（事件）
类ContextHelpButton（QPushButton，ContextHelpBaseClass）：
“”“带上下文帮助的QPush按钮”“”
定义初始化（self，text）：
super（ContextHelpButton，self）。\uuuu init\uuuu（self）
self.setText（文本）
self.helpText=“这是QPushButton上下文帮助文本”
def测试（自我）：
打印（“按钮”）
类ContextHelpComboBox（QComboBox，ContextHelpBaseClass）：
“”“带上下文帮助的QPush按钮”“”
定义初始化（自）：
超级（ContextHelpComboBox，self）。\uuuu init\uuuuu（self）
self.helpText=“这是QComboBox上下文帮助文本”
def测试（自我）：
打印（“组合框”）
类主窗口（QWidget）：
def uuu init uuu（self，parent=None）：
超级（主窗口，自我）。\uuuuu初始化\uuuuuuuuuuuuuu（父级=父级）
self.setupUI（）
def设置
from PyQt5.QtWidgets import (QApplication, QLabel, QWidget, QPushButton,
                             QComboBox, QHBoxLayout, QVBoxLayout)
from PyQt5.QtCore    import QObject, pyqtSignal, pyqtSlot

def ContextHelp(text):
    """Decorates a class by adding mousePressEvent method"""
    def AddMouseClickEventDecorator(_class):
        """ Adds 'mousePressEvent()' method to class"""
        def mousePressEvent(self, event):
            _contextHelp.textHelp.emit(text)       #Emit a signal to global ContextHelp Singleton
            super(_class, self).mousePressEvent(event) #Call Widget Base Class event

        #Add 'mousePressEvent' to _class
        setattr(_class, 'mousePressEvent', mousePressEvent)
        return _class #Decorated class
    return AddMouseClickEventDecorator



class ContextHelpSignals(QObject):
    """ Used to send signals globally through the application
        Eventually will be a Global Singleton                """
    textHelp = pyqtSignal(str)

    def __init__(self):
        super(ContextHelpSignals, self).__init__()

# Eventually will be a Global Singleton
_contextHelp = ContextHelpSignals()

class ContexHelpDisplay(QLabel):
    """Display Context Help from widgets that have Context Help"""
    def __init__(self, text):
        super(ContexHelpDisplay, self).__init__()
        self.setText(text)
        _contextHelp.textHelp.connect(self.__displayHelp)

    @pyqtSlot(str)
    def __displayHelp(self, contextHelpText):
        self.setText(contextHelpText)

@ContextHelp("This is a push button")
class ContextHelpButton(QPushButton):
    """QPush Button with Context Help"""
    def __init__(self, text):
        super(ContextHelpButton, self).__init__()
        self.setText(text)

@ContextHelp("This is Combo Box")
class ContextHelpComboBox(QComboBox):
    """QPush Button with Context Help"""
    def __init__(self):
        super(ContextHelpComboBox, self).__init__()


class MainWindow(QWidget):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUI()

    def setupUI(self):
        self.resize(250, 150)
        self.setWindowTitle('Context Help Example')
        self.show()

        button = ContextHelpButton("Test Button")

        comboBox = ContextHelpComboBox()
        comboBox.addItem("Test Item 1")
        comboBox.addItem("Test Item 2")
        comboBox.addItem("Test Item 3")

        helpTextDisplay = ContexHelpDisplay("Context Help")

        button.clicked.connect(self.TestButton)

        vBox = QVBoxLayout()
        vBox.addWidget(button)
        vBox.addWidget(comboBox)

        hBox = QHBoxLayout()
        hBox.addLayout(vBox)
        hBox.addWidget(helpTextDisplay)
        self.setLayout(hBox)

    def TestButton(self):
        print("Button Pressed.")

if __name__ == "__main__":
    app = QApplication([])
    ex  = MainWindow()
    exit(app.exec_())