Python tkinter库之Toplevel 子窗口与主窗口之间的联系

第一次写此类代码，仅是个简单的框架，有待进一步丰富内容。源代码如下：

import tkinter as tk

class Win1Input(tk.Toplevel):

    def __init__(self):
        super().__init__()
        self.title(u'凭证号录入')
        self.geometry('240x150+266+483')
        self.attributes("-toolwindow", 2)
        self.resizable(False,False)
        self.wm_attributes('-topmost',True)
        self.protocol("WM_DELETE_WINDOW", self.cancel)
        self.setup_UI()

    def setup_UI(self):
        global flagWin1
        flagWin1=True
        self.code1 = tk.StringVar()
        self.code2 = tk.IntVar()
        te1=tk.Entry(self, textvariable=self.code1, width=20)
        te2=tk.Entry(self, textvariable=self.code2, width=20)
        te1.place(x=70,y=5)
        te2.place(x=70,y=35)
        tl1=tk.Label(self, text=u'凭证号：', width=8, anchor=tk.E)
        tl2=tk.Label(self, text=u'协议号：', width=8, anchor=tk.E)
        tl1.place(x=5,y=5)
        tl2.place(x=5,y=35)
        tb1=tk.Button(self, text=u"确定", command=self.ok)
        tb2=tk.Button(self, text=u"取消", command=self.cancel)
        tb1.place(x=60,y=80)
        tb2.place(x=150,y=80)
        te1.focus()

    def exit1(self):
        global flagWin1
        flagWin1=False
        print('exitWin1')
        self.destroy()

    def ok(self):
        self.Retcode = [self.code1.get(), self.code2.get()]
        self.exit1()

    def cancel(self):
        self.Retcode = None
        self.exit1()


class Win2Print(tk.Toplevel):

    def __init__(self):
        super().__init__()
        self.title(u'凭证打印')
        self.geometry('400x300+266+483')
        self.attributes("-toolwindow", 2)
        self.resizable(False,False)
        self.wm_attributes('-topmost',True)
        self.protocol("WM_DELETE_WINDOW", self.cancel)
        self.setup_UI()

    def setup_UI(self):
        global flagWin2
        flagWin2=True
        tcv=tk.Canvas(self, width=400, height=220, bg='white')
        tcv.create_text((20, 80), text=u'凭证打印的内容，此处略', anchor=tk.W)
        tcv.place(x=0,y=0)
        tb1=tk.Button(self, text=u"打印", command=self.ok)
        tb2=tk.Button(self, text=u"取消", command=self.cancel)
        tb1.place(x=90,y=250)
        tb2.place(x=200,y=250)

    def exit2(self):
        global flagWin2
        flagWin2=False
        print('exitWin2')
        self.destroy()

    def ok(self):
        self.Retcode = "Print OK"
        self.exit2()

    def cancel(self):
        self.Retcode = None
        self.exit2()


class AppMain(tk.Tk):

    def __init__(self):
        super().__init__()
        global flagWin1,flagWin2
        flagWin1=flagWin2=False
        self.title(u'房贷记账小助手')
        self.geometry('240x480+10+480')
        self.resizable(False,False)
        self.wm_attributes('-topmost',True)
        self.code1 = 'T1234567'
        self.code2 = 123456789
        self.protocol("WM_DELETE_WINDOW", self.exitMainApp) #点击关闭按钮触发
        self.setup_UI()

    def setup_UI(self):
        tl1=tk.Label(self, text=u'凭证号：', width=8, anchor=tk.E)
        tl2=tk.Label(self, text=u'协议号：', width=8, anchor=tk.E)
        tl1.place(x=5,y=5)
        tl2.place(x=5,y=35)

        self.tl3 = tk.Label(self, text=self.code1, width=21, anchor=tk.W)
        self.tl4 = tk.Label(self, text=self.code2, width=21, anchor=tk.W)
        self.tl3.place(x=70,y=5)
        self.tl4.place(x=70,y=35)

        tb1=tk.Button(self, text=u"录入", command=self.setup_config)
        tb1.place(x=50,y=100)
        tb2=tk.Button(self, text=u"打印", command=self.setup_config2)
        tb2.place(x=120,y=100)

    def setup_config(self):
        global flagWin1,flagWin2
        if flagWin1:
            self.Input1.focus()
            return
        if flagWin2:
            self.Print1.focus()
            return
        res = self.get_voucherNum()
        if res is None: return
        self.code1, self.code2 = res
        self.tl3.config(text=self.code1)
        self.tl4.config(text=self.code2)

    def setup_config2(self):
        global flagWin1,flagWin2
        if flagWin1:
            self.Input1.focus()
            return
        if flagWin2:
            self.Print1.focus()
            return
        res = self.print_voucher()
        if res is None: return


    def get_voucherNum(self):
        '''对应Win1Input窗口类'''
        self.Input1 = Win1Input()
        self.wait_window(self.Input1)
        try:
            return self.Input1.Retcode
        except:
            pass

    def print_voucher(self):
        '''对应Win2Print窗口类'''
        print('print')
        self.Print1 = Win2Print()
        self.wait_window(self.Print1)
        try:
            return self.Print1.Retcode
        except:
            pass

    def exitMainApp(self):
        '''点击关闭按钮触发'''
        print(flagWin1,flagWin2) #退出时子窗口Win1,Win2是否打开
        if flagWin1 or flagWin2: return #判断子窗口是否关闭
        print('exit(0)')
        self.destroy()


if __name__ == '__main__':

    app = AppMain()
    app.mainloop()

运行效果截图：（实际运行时，两子窗口不能共存的）