Question

我有以下GUI代码，我无法开始工作。我希望它执行以下操作：

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值，然后执行该功能的其余部分。这包括关闭GUI（我不知道怎么做，除了手动关闭它）。

我还希望GUI将Val1和Val2退出课堂。代码的最后一行是“print Total”，这是我给返回值的名称。

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 ...你确定你不想让Val1和Val2成为Values类的属性，并让submit按钮设置值吗？

然后你可以随时检查/返回/使用它们self.Val1和self.Val2？你也可以使用self.destroy（）或self.quit（）来破坏窗口（查看每个方法并确定哪个对你有用）。

通常，按钮回调不会用于以您描述的方式返回值。通常，它们将运行一些函数来处理或修改类的属性。

另外，请记住，退出mainloop后可以访问这些属性，这似乎是你想要用它们做的事情：

编辑：下面是您的代码的略微简化版本。我删除了消息框的内容，创建了类的值和fields属性，并在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

返回Tkinter文本条目的值，关闭GUI

1 个答案: