双击将txt文件添加到自定义PyQt编辑器

from PyQt5 import QtWidgets, QtGui, QtCore
from PyQt5.QtWidgets import QMainWindow, QApplication, QFileDialog

class CustomEditor(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("Custom Editor")

        # 创建菜单栏
        menubar = self.menuBar()

        # 创建文件菜单
        file_menu = menubar.addMenu('文件')

        # 创建打开文件操作
        open_file_action = QtWidgets.QAction('打开文件', self)
        open_file_action.setShortcut('Ctrl+O')
        open_file_action.triggered.connect(self.openFile)

        # 将打开文件操作添加到文件菜单中
        file_menu.addAction(open_file_action)

        # 创建文本编辑区域
        self.text_edit = QtWidgets.QTextEdit()
        self.setCentralWidget(self.text_edit)

    def openFile(self):
        # 弹出文件选择对话框
        file_dialog = QFileDialog(self)
        file_dialog.setWindowTitle("选择文件")
        file_dialog.setFileMode(QFileDialog.ExistingFile)
        file_dialog.setNameFilter("文本文件 (*.txt)")

        if file_dialog.exec_():
            selected_file = file_dialog.selectedFiles()[0]
            
            # 读取并显示文件内容
            with open(selected_file, 'r') as file:
                content = file.read()
                self.text_edit.setText(content)

if __name__ == '__main__':
    app = QApplication([])
    window = CustomEditor()
    window.show()
    app.exec()