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我有以下 GUI 代码，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，除了手动关闭它）。

  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
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1 回答 1

2

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，您可以随时使用 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）。

通常，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。

另外，请记住，这些属性可以在退出主循环后访问，这似乎是您想要对它们执行的操作：

编辑：下面是您的代码的稍微简化的版本。我删除了消息框的东西，为你的类设置了值和字段属性，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
于 2013-06-10T20:36:33.303 回答