自定义类的 InstallEventFilter

Question

我写了一个小程序，想安装EventFilter来跟踪鼠标事件。 任何的想法？

#!/usr/bin/env python
import os
import sys
from PySide2.QtCore import Qt, QSize, QRegExp, QFile, QTextStream
from PySide2.QtGui import QKeySequence, QTextCharFormat, QBrush,QColor, QTextDocument, QTextCursor
from PySide2.QtWidgets import (QApplication, QDesktopWidget, QMainWindow,
                               QPlainTextEdit, QGridLayout, QGroupBox,
                               QFormLayout, QHBoxLayout, QLabel, QLineEdit,
                               QMenu, QMenuBar, QPushButton, QMessageBox,
                               QTextEdit, QVBoxLayout, QWidget, QAction)

class BlockWindow():
    def __init__(self, waiver_files, app):
        self.waiver_files = waiver_files
        self.app = app
    
    def create_widget(self): 
        self.create_violation_text()
        self.create_violation_window()
        self.create_text_finder()
        #order matter
        main_layout = QVBoxLayout()
        main_layout.addWidget(self.text_finder)
        main_layout.addWidget(self.create_violation_box)
        return main_layout
       
    
    def create_text_finder(self):
        """
        create text finder which wil search string into document
        """
        self.text_finder = QGroupBox()
        layout = QHBoxLayout()
        label = QLabel()
        label.setText("Keyword:")
        self.line_edit = QLineEdit()
        self.line_edit.setText("Enter your search here")
        push_button = QPushButton("Find")
        layout.addWidget(label)
        layout.addWidget(self.line_edit)
        layout.addWidget(push_button)
        self.text_finder.setLayout(layout)
    
    def create_violation_window(self):
        """
        creating violation window which contain text editor,
        violation type and checkbox
        """
        self.create_violation_box = QGroupBox()
        layout = QGridLayout()
        layout.addWidget(self.plain_textedit, 1, 0, 12, 1)
        layout.setColumnMinimumWidth(0, 10)
        self.create_violation_box.setLayout(layout)
    
    def create_violation_text(self):
        """
        creating main violation window which contain all violations
        """
        self.plain_textedit =  QPlainTextEdit()
        self.plain_textedit.setLineWrapMode(QPlainTextEdit.NoWrap)
        self.plain_textedit.setStyleSheet(
        """QPlainTextEdit {font-size: 14pt;
                           font-family: Courier;}""")
        self.plain_textedit.viewport().installEventFilter(self)
    

class MainWindow(QMainWindow):
    def __init__(self, waiver_files, app):
        super().__init__()
        self.width = 1100
        self.height = 700
        self.waiver_files = waiver_files
        self.app = app
        self.set_main_window()
        
        
    def set_main_window(self):
        """
        Setting main window position
        """
        self.setWindowTitle("GUI %s" %(os.path.abspath(__file__)))
        self.setFixedSize(QSize(self.width, self.height))
        wid = QDesktopWidget() 
        screen_width = wid.screen().frameGeometry().width()
        screen_height = wid.screen().frameGeometry().height()
        self.setGeometry(screen_width/2-self.width/2,
                         screen_height/2-self.height/2, 
                         self.width, self.height)
    
    def create_block(self):
        blk = BlockWindow(self.waiver_files, self.app)
        main_layout = blk.create_widget()
        window = QWidget()
        window.setLayout(main_layout)
        self.setCentralWidget(window)
    
    def eventfilter(self, obj, event):
        print ("hi")

        
if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow(__file__, app)
    window.create_block()
    window.show()
    app.exec_()