Stakoverflow关于pyQt5中QTextEdit绑定鼠标事件的方法，其他控件绑定鼠标事件差不多

原文链接如下和代码如下

https://stackoverflow.com/questions/53294597/how-to-define-a-mousepressevent-function-for-a-qtextedit-widget-without-subclass/53299802#53299802

from PyQt5 import QtCore, QtWidgets

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

        self.edit = QtWidgets.QTextEdit()
        btn = QtWidgets.QPushButton()
        le = QtWidgets.QLineEdit()

        lay = QtWidgets.QVBoxLayout(self)
        for w in (self.edit, btn, le):
            lay.addWidget(w)

        self.edit.viewport().installEventFilter(self)

    def eventFilter(self, obj, event):
        if obj is self.edit.viewport() and event.type() == QtCore.QEvent.MouseButtonPress:
            if event.button() == QtCore.Qt.LeftButton:
                print('test')
        return super(Widget, self).eventFilter(obj, event)

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