避免在Tkinter中重叠屏幕

Question

我使用Tkinter制作带有某些功能的MenuBar，我想在MenuBar下面的同一窗口中显示它们。下面的代码可以这样做。但问题是当我来回切换功能时，它与前一个功能显示重叠，你仍然可以看到标签（或条目），并能够输入上一个功能的条目。

有没有办法在每次运行函数之前刷新显示？像cls一样。

import Tkinter
from Tkinter import Tk, Frame, Menu
from Tkinter import IntVar, BOTH
class App(Frame):

    def __init__(self, parent):
        Frame.__init__(self, parent)            
        self.parent = parent        
        self.initUI()

    def initUI(self):      
        self.parent.title("Test")        
        menubar = Menu(self.parent)
        self.parent.config(menu=menubar)        
        fileMenu = Menu(menubar)     
        menubar.add_cascade(label="Discrepancy", menu=fileMenu)
        fileMenu.add_command(label="View current case", command=self.view)
        fileMenu.add_command(label="OK Process", command=self.OK)        

    def view(self):
        self.pack(fill=BOTH, expand=1)
        self.var = IntVar()
        Tkinter.Label(self,text="RMA", relief=Tkinter.RIDGE).grid(row=0, column=0, sticky=Tkinter.W)
        Tkinter.Label(self, text="SN", relief=Tkinter.RIDGE).grid(row=0, column=1, sticky=Tkinter.W)

    def OK(self):
        self.pack(fill=BOTH, expand=1)
        self.var = IntVar()

        Tkinter.Label(self,text="RMA").grid(row=0)
        Tkinter.Label(self, text="SN").grid(row=1)
        Tkinter.Entry(self, width=50).grid(row=0, column=1,pady=4)
        Tkinter.Entry(self, width=50).grid(row=1, column=1,pady=4)

def main():

    root = Tk()
    root.geometry("1280x720")
    app = App(root)
    root.mainloop()  

if __name__ == '__main__':
    main() 

Answer 1

使用grid_forget()隐藏元素。

您可以在新Frame中添加元素，然后您只需对此框架使用grid_forget()。

您甚至可以在开头创建所有小部件，然后使用grid_forget()隐藏并grid(...)再次显示。

---

修改

import Tkinter
from Tkinter import Tk, Frame, Menu
from Tkinter import IntVar, BOTH
class App(Frame):

    def __init__(self, parent):
        Frame.__init__(self, parent)            
        self.parent = parent        
        self.initUI()

    def initUI(self):      
        self.parent.title("Test")        
        menubar = Menu(self.parent)
        self.parent.config(menu=menubar)        
        fileMenu = Menu(menubar)     
        menubar.add_cascade(label="Discrepancy", menu=fileMenu)
        fileMenu.add_command(label="View current case", command=self.view)
        fileMenu.add_command(label="OK Process", command=self.OK)

        self.var = IntVar()

        self.view_label1 = Tkinter.Label(self, text="RMA", relief=Tkinter.RIDGE)
        self.view_label2 = Tkinter.Label(self, text="SN", relief=Tkinter.RIDGE)

        self.ok_label1 = Tkinter.Label(self,text="RMA")
        self.ok_label2 = Tkinter.Label(self, text="SN")

        self.ok_entry1 = Tkinter.Entry(self, width=50)
        self.ok_entry2 = Tkinter.Entry(self, width=50)

        self.pack(fill=BOTH, expand=1)

    def view(self):
        self.ok_label1.grid_forget()
        self.ok_label2.grid_forget()
        self.ok_entry1.grid_forget()
        self.ok_entry2.grid_forget()

        self.view_label1.grid(row=0, column=0, sticky=Tkinter.W)
        self.view_label2.grid(row=0, column=1, sticky=Tkinter.W)

    def OK(self):
        self.view_label1.grid_forget()
        self.view_label2.grid_forget()

        self.ok_label1.grid(row=0)
        self.ok_label2.grid(row=1)
        self.ok_entry1.grid(row=0, column=1, pady=4)
        self.ok_entry2.grid(row=1, column=1, pady=4)

def main():

    root = Tk()
    root.geometry("1280x720")
    app = App(root)
    root.mainloop()

if __name__ == '__main__':
    main() 

---

使用Frame

编辑

import Tkinter
from Tkinter import Tk, Frame, Menu
from Tkinter import IntVar, BOTH
class App(Frame):

    def __init__(self, parent):
        Frame.__init__(self, parent)            
        self.parent = parent        
        self.initUI()

    def initUI(self):      
        self.parent.title("Test")        
        menubar = Menu(self.parent)
        self.parent.config(menu=menubar)        
        fileMenu = Menu(menubar)     
        menubar.add_cascade(label="Discrepancy", menu=fileMenu)
        fileMenu.add_command(label="View current case", command=self.view)
        fileMenu.add_command(label="OK Process", command=self.OK)

        self.var = IntVar()

        self.frame_view = Frame(self)
        self.view_label1 = Tkinter.Label(self.frame_view, text="RMA", relief=Tkinter.RIDGE)
        self.view_label2 = Tkinter.Label(self.frame_view, text="SN", relief=Tkinter.RIDGE)
        self.view_label1.grid(row=0, column=0, sticky=Tkinter.W)
        self.view_label2.grid(row=0, column=1, sticky=Tkinter.W)
        #self.frame_view.pack(fill=BOTH, expand=1)

        self.frame_ok = Frame(self)
        self.ok_label1 = Tkinter.Label(self.frame_ok, text="RMA")
        self.ok_label2 = Tkinter.Label(self.frame_ok, text="SN")
        self.ok_entry1 = Tkinter.Entry(self.frame_ok, width=50)
        self.ok_entry2 = Tkinter.Entry(self.frame_ok, width=50)
        self.ok_label1.grid(row=0)
        self.ok_label2.grid(row=1)
        self.ok_entry1.grid(row=0, column=1, pady=4)
        self.ok_entry2.grid(row=1, column=1, pady=4)
        #self.frame_ok.pack(fill=BOTH, expand=1)

        self.pack(fill=BOTH, expand=1)

    def view(self):
        self.frame_ok.grid_forget()

        self.frame_view.grid()

    def OK(self):
        self.frame_view.grid_forget()

        self.frame_ok.grid()


def main():

    root = Tk()
    root.geometry("1280x720")
    app = App(root)
    root.mainloop()

if __name__ == '__main__':
    main()