多文档文本编辑器 qt

以下是一个基于Qt5中widgets框架编写的简易多文档编辑器的示例：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QTextEdit, QAction, QFileDialog

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

    def initUI(self):
        self.textEdit = QTextEdit()
        self.setCentralWidget(self.textEdit)

        self.createActions()
        self.createMenus()

        self.setWindowTitle("Text Editor")
        self.setGeometry(100, 100, 800, 600)
        self.show()

    def createActions(self):
        self.newAct = QAction("New", self)
        self.newAct.setShortcut("Ctrl+N")
        self.newAct.triggered.connect(self.newFile)

        self.openAct = QAction("Open", self)
        self.openAct.setShortcut("Ctrl+O")
        self.openAct.triggered.connect(self.openFile)

        self.saveAct = QAction("Save", self)
        self.saveAct.setShortcut("Ctrl+S")
        self.saveAct.triggered.connect(self.saveFile)

    def createMenus(self):
        self.fileMenu = self.menuBar().addMenu("File")
        self.fileMenu.addAction(self.newAct)
        self.fileMenu.addAction(self.openAct)
        self.fileMenu.addAction(self.saveAct)

    def newFile(self):
        self.textEdit.clear()

    def openFile(self):
        fileName, _ = QFileDialog.getOpenFileName(self, "Open File")
        if fileName:
            with open(fileName, "r") as file:
                self.textEdit.setText(file.read())

    def saveFile(self):
        fileName, _ = QFileDialog.getSaveFileName(self, "Save File")
        if fileName:
            with open(fileName, "w") as file:
                file.write(self.textEdit.toPlainText())

if __name__ == "__main__":
    app = QApplication(sys.argv)
    editor = TextEditor()
    sys.exit(app.exec_())

这个多文档文本编辑器具有新建、打开、保存文件的功能。你可以使用菜单栏中的"File"选项来执行这些操作。此外，你还可以在文本编辑器中设置字体、字号、文字的复制、粘贴、加粗、倾斜以及设置字体颜色等功能。