如何在 PyQt6 中检查 MouseButtonPress 事件？

原文来自：https://qa.1r1g.com/sf/ask/4636496301/

在 PyQt5 中，我们可以使用 QEvent 类来验证事件的发生，例如 QEvent.MouseButtonPress。在 PyQt6 中，该语句不再有效。我已经检查了PyQt6.QtCore.QEvent和PyQt6.QtGui.QMouseEvent类的成员，我似乎无法找到包含 MouseButtonPress 事件值的正确 Enum 类。

PyQt5 示例我正在尝试翻译为 PyQt6

import sys
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtCore import QEvent, Qt

class AppDemo(QWidget):
    def __init__(self):
        super().__init__()
        self.resize(800, 400)
        self.installEventFilter(self)
        
    def eventFilter(self, QObject, event):
        if event.type() == QEvent.MouseButtonPress: # <-- No longer work in PyQt6
            if event.button() == Qt.RightButton: # <-- Becomes event.button() == Qt.MouseButtons.RightButton
                print('Right button clicked')           

        return True

if __name__ == '__main__':
    app = QApplication(sys.argv)

    demo = AppDemo()
    demo.show()

    try:
        sys.exit(app.exec_())
    except SystemExit:
        print('Closing Window...')

更新：如果我打印 QEvent 和 QMouseEvent 的成员，这就是所有成员都可用。

print('Members of PyQt6.QtCore.QEvent')
print(dir(QEvent))
print('-'*50)
print('Members of PyQt6.QtCore.QMouseEvent')
print(dir(QMouseEvent))

>>>
Members of PyQt6.QtCore.QEvent
['Type', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'accept', 'clone', 'ignore', 'isAccepted', 'isInputEvent', 'isPointerEvent', 'isSinglePointEvent', 'registerEventType', 'setAccepted', 'spontaneous', 'type']
--------------------------------------------------
Members of PyQt6.QtCore.QMouseEvent
['Type', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'accept', 'allPointsAccepted', 'button', 'buttons', 'clone', 'device', 'deviceType', 'exclusivePointGrabber', 'globalPosition', 'ignore', 'isAccepted', 'isBeginEvent', 'isEndEvent', 'isInputEvent', 'isPointerEvent', 'isSinglePointEvent', 'isUpdateEvent', 'modifiers', 'point', 'pointById', 'pointCount', 'pointerType', 'pointingDevice', 'points', 'position', 'registerEventType', 'scenePosition', 'setAccepted', 'setExclusivePointGrabber', 'spontaneous', 'timestamp', 'type']

PyQt6 枚举使用 python 枚举的主要更改之一，因此您必须使用枚举名称作为中介，在您的情况下，MouseButtonPress 属于 Type 枚举，RightButton 属于 MouseButtons，因此您必须将其更改为：

def eventFilter(self, QObject, event):
    if event.type() == QEvent.Type.MouseButtonPress:
        if event.button() == Qt.MouseButtons.RightButton:
            print("Right button clicked")

    return True

完整例子：

import sys
from PyQt6.QtWidgets import *
from PyQt6.QtCore import QEvent
# from PyQt6.QtGui import *

# print(dir(QEvent))

class App(QApplication):
    def notify(self, recevier, evt):
        if (recevier.inherits("QPushButton") and evt.type() == QEvent.Type.MouseButtonPress):
            print(recevier,evt)

        return super().notify(recevier, evt)

class Btn(QPushButton):
    def event(self, evt):
        if evt.type() == QEvent.Type.MouseButtonPress:
            print(evt)
        return super().event(evt)

    def mousePressEvent(self, *args, **kwargs):
        print("鼠标被按下了......")
        return super().mousePressEvent(*args, **kwargs)



app = App(sys.argv)

window = QWidget()

btn = Btn(window)
btn.setText("按钮")
btn.move(100, 100)

def cao():
    print("按钮被点击了")

btn.pressed.connect(cao)

window.show()

sys.exit(app.exec())