[英]Communication between python objects?
這個想法是從Gui創建一個Toplevel窗口,並在Toplevel關閉后將數據(名稱)從Toplevel Entry發送回Gui。
對象應用程序如何知道toplev對象是否被破壞?
或換句話說
Gui的對象如何知道My_Toplevel的對象已關閉?
from tkinter import *
font1 = font=("Open Sans Standard",16,"bold")
class My_Toplevel():
def __init__(self, master=None):
self.master = master
self.toplev = Toplevel(master)
self.name = None
self.create_widgets()
def create_widgets(self):
self.entry_name = Entry(self.toplev, font=font1)
self.button_ok = Button(self.toplev, text="Ok", font=font1,
command=self.get_name)
self.entry_name.pack()
self.button_ok.pack()
def get_name(self):
self.name = self.entry_name.get()
self.toplev.destroy()
class Gui(Frame):
def __init__(self, master):
Frame.__init__(self, master)
self.pack()
self.master = master
self.label_text = Label(self, text="Foo Bar Window", font=font1)
self.label_text.pack()
self.button_toplevel = Button(self, text="Create Toplevel",
command=self.get_toplevel, font=font1)
self.button_toplevel.pack()
def get_toplevel(self):
self.my_top = My_Toplevel(self)
if __name__ == "__main__":
root = Tk()
root.title("Parent")
app = Gui(root)
root.mainloop()
在銷毀My_Toplevel
之前,需要將數據傳遞到Gui
實例。 一種方法是將名稱字符串保存為Gui
實例的屬性,因為在調用My_Toplevel
時傳遞了master
參數。 例如:
from tkinter import *
font1 = font=("Open Sans Standard",16,"bold")
class My_Toplevel():
def __init__(self, master=None):
self.master = master
self.toplev = Toplevel(master)
self.create_widgets()
def create_widgets(self):
self.entry_name = Entry(self.toplev, font=font1)
self.button_ok = Button(self.toplev, text="Ok", font=font1,
command=self.get_name)
self.entry_name.pack()
self.button_ok.pack()
def get_name(self):
self.master.name_data = self.entry_name.get()
self.toplev.destroy()
class Gui(Frame):
def __init__(self, master):
Frame.__init__(self, master)
self.pack()
self.master = master
self.label_text = Label(self, text="Foo Bar Window", font=font1)
self.label_text.pack()
self.button_toplevel = Button(self, text="Create Toplevel",
command=self.get_toplevel, font=font1)
self.button_toplevel.pack()
self.name_data = None
Button(self, text="show name", command=self.show_name).pack()
def show_name(self):
print("Name =", self.name_data)
def get_toplevel(self):
self.my_top = My_Toplevel(self)
if __name__ == "__main__":
root = Tk()
root.title("Parent")
app = Gui(root)
root.mainloop()
按下“顯示名稱”按鈕,將名稱字符串打印到控制台。
如果您需要保存多個字符串,可以將名稱附加到列表中,將其保存在字典中,等等。
如果願意,可以在Gui.show_name
TopLevel窗口之前調用Gui.show_name
方法:
def get_name(self):
self.master.name_data = self.entry_name.get()
self.master.show_name()
self.toplev.destroy()
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