记事本炫酷代码

以下是一个炫酷的记事本应用程序的代码，使用了 PySide2 库和 Qt Designer 设计界面：

import sys
from PySide2.QtWidgets import QApplication, QMainWindow, QTextEdit, QFileDialog
from PySide2.QtGui import QIcon
from PySide2.QtCore import Qt
from ui_mainwindow import Ui_MainWindow

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        # Load the UI from the .ui file
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        # Set the window icon
        self.setWindowIcon(QIcon("icon.png"))

        # Connect signals and slots
        self.ui.actionNew.triggered.connect(self.new_file)
        self.ui.actionOpen.triggered.connect(self.open_file)
        self.ui.actionSave.triggered.connect(self.save_file)
        self.ui.actionSave_As.triggered.connect(self.save_file_as)
        self.ui.actionCut.triggered.connect(self.cut_text)
        self.ui.actionCopy.triggered.connect(self.copy_text)
        self.ui.actionPaste.triggered.connect(self.paste_text)
        self.ui.actionUndo.triggered.connect(self.undo)
        self.ui.actionRedo.triggered.connect(self.redo)
        self.ui.textEdit.selectionChanged.connect(self.update_status)

        # Set the initial status
        self.update_status()

    def new_file(self):
        self.ui.textEdit.clear()
        self.update_status()

    def open_file(self):
        file_path, _ = QFileDialog.getOpenFileName(self, "Open File")
        if file_path:
            with open(file_path, "r") as f:
                self.ui.textEdit.setText(f.read())
            self.update_status()

    def save_file(self):
        if self.current_file:
            with open(self.current_file, "w") as f:
                f.write(self.ui.textEdit.toPlainText())
        else:
            self.save_file_as()

    def save_file_as(self):
        file_path, _ = QFileDialog.getSaveFileName(self, "Save File", "", "Text Files (*.txt)")
        if file_path:
            with open(file_path, "w") as f:
                f.write(self.ui.textEdit.toPlainText())
            self.current_file = file_path
            self.update_status()

    def cut_text(self):
        self.ui.textEdit.cut()

    def copy_text(self):
        self.ui.textEdit.copy()

    def paste_text(self):
        self.ui.textEdit.paste()

    def undo(self):
        self.ui.textEdit.undo()

    def redo(self):
        self.ui.textEdit.redo()

    def update_status(self):
        cursor = self.ui.textEdit.textCursor()
        selected_text = cursor.selectedText()
        if selected_text:
            status = f"Selected: {len(selected_text)} characters"
        else:
            status = f"Characters: {self.ui.textEdit.document().characterCount()}"
        self.ui.statusbar.showMessage(status)

if __name__ == "__main__":
    # Create the application and main window
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    # Run the event loop
    sys.exit(app.exec_())

其中，`ui_mainwindow.py` 是由 Qt Designer 生成的 UI 文件，包含了主窗口的布局和控件。这个记事本应用程序具有新建、打开、保存、编辑等常用功能，也支持撤销、重做、剪切、复制和粘贴等操作，还可以显示当前选中的文本长度或整个文本的字符数。该程序使用了 PySide2 库提供的 Qt 框架，可以跨平台运行。