from Tkinter import *
import tkMessageBox,tkFileDialog
import platform

# nl = os.linesep

def openfile():
    global filename             # 使用global聲明為全局變量，方便后邊的程序調(diào)用
    systype = platform.system() # 判斷系統(tǒng)類型
    if systype == 'windows':
        basedir = 'c:\\'
    else:
        basedir = '/'
    filename = tkFileDialog.askopenfilename(initialdir=basedir)
    try:
        fobj_r = open(filename, 'r')
    except IOError, errmsg:
        print '*** Failed open file:', errmsg
    else:
        editbox.delete(1.0, END)
        for eachline in fobj_r:
            editbox.insert(INSERT, eachline)
        fobj_r.close()

def savefile():
    save_data = editbox.get(1.0, END)
    try:
        fobj_w = open(filename, 'w')
        fobj_w.writelines(save_data.encode('utf-8'))
        fobj_w.close()
        tkMessageBox.showinfo(title='提示',
                message='保存成功')
    except IOError, errmsg:
        tkMessageBox.showwarning(title='保存失敗', message='保存出錯(cuò)    ')
        tkMessageBox.showwarning(title='錯(cuò)誤信息', message=errmsg)
    except NameError:
        tkMessageBox.showwarning(title='保存失敗', message='未打開(kāi)文件')
def showlinenum():
    tkMessageBox.showinfo(title='提示',
            message='這個(gè)功能作者現(xiàn)在不會(huì)寫(xiě),放這里裝飾用的.')
def destroy_ui(ui):
    ui.destroy()

def aboutauthor():
    author_ui = Toplevel()
    author_ui.title('關(guān)于')
    author_ui.geometry('200x80')
    about_string = Label(author_ui,
            text="作者: ToughGuy")
    confirmbtn = Button(author_ui, text='確定',
            command=lambda:destroy_ui(author_ui))
    about_string.pack()
    confirmbtn.pack()
    # author_ui.mainloop()

def CreateMenus():
    # 初始化菜單
    Menubar = Menu(root)

    # 創(chuàng)建文件菜單
    filemenu = Menu(Menubar, tearoff=0)
    filemenu.add_command(label='打開(kāi)文件', command=openfile)
    filemenu.add_command(label='保存文件', command=savefile)
    filemenu.add_command(label='退出', command=lambda:destroy_ui(root))
    Menubar.add_cascade(label='文件', menu=filemenu)

    # 創(chuàng)建編輯菜單
    editmenu = Menu(Menubar, tearoff=0)
    editmenu.add_command(label='顯示行號(hào)', command=showlinenum)
    Menubar.add_cascade(label='編輯', menu=editmenu)

    # 創(chuàng)建幫助菜單
    helpmenu = Menu(Menubar, tearoff=0)
    helpmenu.add_command(label='關(guān)于作者', command=aboutauthor)
    Menubar.add_cascade(label='幫助', menu=helpmenu)
    root.config(menu=Menubar)

root = Tk()
root.title('文本編輯器')
root.geometry('500x400')
CreateMenus()
editbox = Text(root, width=70, height=25, bg='white')
editbox.pack(side=TOP, fill=X)
root.mainloop()