python - Tkinter 文本输入的返回值，关闭 GUI

Question

我有以下 GUI 代码，但我无法开始工作。我希望它执行以下操作:

1. 对于提交功能，我希望它检查 Val1 或 Val2 是否为空，然后警告用户并暂停该功能以允许用户输入一个值，然后执行该功能的其余部分。这包括关闭 GUI(我不知道该怎么做，除非手动关闭它)。

2. 我还希望 GUI 从类中返回 Val1 和 Val2。代码的最后一行是“print Total”，这是我给返回值起的名字。

   import Tkinter
   import tkMessageBox
   class Values(Tkinter.Tk):
      def __init__(self,parent):
           Tkinter.Tk.__init__(self,parent)
           self.parent = parent
           self.initialize()
      def initialize(self):
           self.grid()
           stepOne = Tkinter.LabelFrame(self, text=" 1. Enter Values ")
           stepOne.grid(row=0, columnspan=7, sticky='W',padx=5, pady=5, ipadx=5, ipady=5)
           Val1Lbl = Tkinter.Label(stepOne,text="Value 1")
           Val1Lbl.grid(row=0, column=0, sticky='E', padx=5, pady=2)
           Val1Txt = Tkinter.Entry(stepOne)
           Val1Txt.grid(row=0, column=1, columnspan=3, pady=2, sticky='WE')
           Val2Lbl = Tkinter.Label(stepOne,text="Value 2")
           Val2Lbl.grid(row=1, column=0, sticky='E', padx=5, pady=2)
           Val2Txt = Tkinter.Entry(stepOne)
           Val2Txt.grid(row=1, column=1, columnspan=3, pady=2, sticky='WE')
       def submit():
          Val1=Val1Txt.get()
          if Val1 == '':
              Win2=Tkinter.Tk()
              Win2.withdraw()
              tkMessageBox.showinfo(message="Value 1 is empty")
             ##Stop submit from going any further.Allow user to enter a value and then          
             ##carryout.  
   
           Val2=Val2Txt.get()
           if Val2 == '':
               Win2=Tkinter.Tk()
               Win2.withdraw()
               tkMessageBox.showinfo(message="Value 2 is empty")
               ###Stop submit from going any further.Allow user to enter a value and then
               ##carryout
   
            ###Close GUI (Part of submit function)
            return Val1,Val2
   
        SubmitBtn = Tkinter.Button(stepOne, text="Submit",command=submit)
        SubmitBtn.grid(row=4, column=3, sticky='W', padx=5, pady=2)
   if__name__== "__main__":  
        app = Values(None)
        app.title('Values')
        app.mainloop()
   
   
   ###Do something with returned values
   Total = Values##Is this the correct way of getting the returned values?
   print Total
   

Answer 1

Hrrm...您确定不想让 Val1 和 Val2 成为 Values 类的属性，并让提交按钮设置值吗？

然后你可以随时用 self.Val1 和 self.Val2 检查/返回/使用它们？您也可以使用 self.destroy() 或 self.quit() 销毁窗口(查看这些方法中的每一个并确定哪个对您有用)。

一般而言，按钮回调不用于以您描述的方式返回值。通常他们会运行一些函数来处理或修改类的属性。

此外，请记住，这些属性可以在退出主循环后访问，这似乎是您想要用它们做的事情:

编辑:下面是您的代码的一个稍微简化的版本。我删除了消息框的东西，制作了你的类的值和字段属性，并在你的提交按钮中添加了一个 quit() 方法。

import Tkinter


class Values(Tkinter.Tk):
    """docstring for Values"""
    def __init__(self, parent):
        Tkinter.Tk.__init__(self,parent)
        self.parent = parent
        self.initialize()

    def initialize(self):
        self.grid()
        stepOne = Tkinter.LabelFrame(self, text=" 1. Enter Values ")
        stepOne.grid(row=0, columnspan=7, sticky='W',padx=5, pady=5, ipadx=5, ipady=5)
        self.Val1Lbl = Tkinter.Label(stepOne,text="Value 1")
        self.Val1Lbl.grid(row=0, column=0, sticky='E', padx=5, pady=2)
        self.Val1Txt = Tkinter.Entry(stepOne)
        self.Val1Txt.grid(row=0, column=1, columnspan=3, pady=2, sticky='WE')
        self.Val2Lbl = Tkinter.Label(stepOne,text="Value 2")
        self.Val2Lbl.grid(row=1, column=0, sticky='E', padx=5, pady=2)
        self.Val2Txt = Tkinter.Entry(stepOne)
        self.Val2Txt.grid(row=1, column=1, columnspan=3, pady=2, sticky='WE')

        self.val1 = None
        self.val2 = None

        SubmitBtn = Tkinter.Button(stepOne, text="Submit",command=self.submit)
        SubmitBtn.grid(row=4, column=3, sticky='W', padx=5, pady=2)

    def submit(self):
        self.val1=self.Val1Txt.get()
        if self.val1=="":
            Win2=Tkinter.Tk()
            Win2.withdraw()

        self.val2=self.Val2Txt.get()
        if self.val2=="":
            Win2=Tkinter.Tk()
            Win2.withdraw()

        self.quit()


if __name__ == '__main__':
    app = Values(None)
    app.title('Values')
    app.mainloop() #this will run until it closes
    #Print the stuff you want.
    print app.val1,app.val2