tkinter实现记事本

以下是使用Tkinter在Python中创建一个简单的记事本的代码示例：

from tkinter import *
from tkinter.filedialog import *

class Notepad:
    __root = Tk()

    # 设置默认窗口大小和文本
    __thisWidth = 300
    __thisHeight = 300
    __thisTextArea = Text(__root)
    __thisMenuBar = Menu(__root)
    __thisFileMenu = Menu(__thisMenuBar, tearoff=0)
    __thisEditMenu = Menu(__thisMenuBar, tearoff=0)
    __thisHelpMenu = Menu(__thisMenuBar, tearoff=0)

    # 添加文件菜单项
    __thisFileMenu.add_command(label="New", command=__newFile)
    __thisFileMenu.add_command(label="Open", command=__openFile)
    __thisFileMenu.add_command(label="Save", command=__saveFile)
    __thisFileMenu.add_separator()
    __thisFileMenu.add_command(label="Exit", command=__quitApplication)
    __thisMenuBar.add_cascade(label="File", menu=__thisFileMenu)

    # 添加编辑菜单项
    __thisEditMenu.add_command(label="Cut", command=__cut)
    __thisEditMenu.add_command(label="Copy", command=__copy)
    __thisEditMenu.add_command(label="Paste", command=__paste)
    __thisMenuBar.add_cascade(label="Edit", menu=__thisEditMenu)

    # 添加帮助菜单项
    __thisHelpMenu.add_command(label="About Notepad", command=__showAbout)
    __thisMenuBar.add_cascade(label="Help", menu=__thisHelpMenu)

    __root.config(menu=__thisMenuBar)
    __thisScrollBar = Scrollbar(__thisTextArea)
    __file = None

    def __init__(self, **kwargs):
        # 设置窗口大小
        try:
            self.__thisWidth = kwargs['width']
        except KeyError:
            pass

        try:
            self.__thisHeight = kwargs['height']
        except KeyError:
            pass

        # 设置窗口标题
        self.__root.title("Untitled - Notepad")

        # 设置窗口的初始大小
        screenWidth = self.__root.winfo_screenwidth()
        screenHeight = self.__root.winfo_screenheight()

        # 计算窗口的左上角坐标
        left = (screenWidth / 2) - (self.__thisWidth / 2)
        top = (screenHeight / 2) - (self.__thisHeight / 2)

        # 设置窗口的尺寸和位置
        self.__root.geometry('%dx%d+%d+%d' % (self.__thisWidth, self.__thisHeight, left, top))

        # 添加文本区域和滚动条
        self.__root.grid_rowconfigure(0, weight=1)
        self.__root.grid_columnconfigure(0, weight=1)
        self.__thisTextArea.grid(sticky=N + E + S + W)
        self.__thisTextArea.configure(yscrollcommand=self.__thisScrollBar.set)
        self.__thisScrollBar.grid(row=0, column=1, sticky=N + S + E)
        self.__thisScrollBar.configure(command=self.__thisTextArea.yview)

    def __quitApplication(self):
        self.__root.destroy()

    def __showAbout(self):
        showinfo("Notepad", "Created by: Your Name")

    def __openFile(self):
        self.__file = askopenfilename(defaultextension=".txt", filetypes=[("All Files", "*.*"), ("Text Documents", "*.txt")])

        if self.__file == "":
            self.__file = None
        else:
            self.__root.title(os.path.basename(self.__file) + " - Notepad")
            self.__thisTextArea.delete(1.0, END)

            file = open(self.__file, "r")
            self.__thisTextArea.insert(1.0, file.read())
            file.close()

    def __newFile(self):
        self.__root.title("Untitled - Notepad")
        self.__file = None
        self.__thisTextArea.delete(1.0, END)

    def __saveFile(self):
        if self.__file == None:
            self.__file = asksaveasfilename(initialfile='Untitled.txt', defaultextension=".txt", filetypes=[("All Files", "*.*"), ("Text Documents", "*.txt")])

            if self.__file == "":
                self.__file = None
            else:
                file = open(self.__file, "w")
                file.write(self.__thisTextArea.get(1.0, END))
                file.close()

                self.__root.title(os.path.basename(self.__file) + " - Notepad")
        else:
            file = open(self.__file, "w")
            file.write(self.__thisTextArea.get(1.0, END))
            file.close()

    def __cut(self):
        self.__thisTextArea.event_generate("<<Cut>>")

    def __copy(self):
        self.__thisTextArea.event_generate("<<Copy>>")

    def __paste(self):
        self.__thisTextArea.event_generate("<<Paste>>")

    def run(self):
        self.__root.mainloop()

notepad = Notepad(width=600, height=400)
notepad.run()