tkinter自动加载窗口
tkinter自动加载窗口
提问于 2021-07-06 21:43:31
我在这里有这段代码，我想把值从一个类(StartPage)传递到另一个类(PageOne)。我在控制器"get_page“中创建了一个方法，让我可以在类之间访问页面数据。因此，我在StartPage中有一个条目，我想将它的值传递给PageOne。因此，代码运行了，但是在PageOne中有一个用于调试的打印。只要我启动程序，它就会自动运行所有代码，就像即使我没有按下按钮也会调用PageOne一样。并且我想要传递给第二页的值永远不会被传递。有谁能帮帮我吗？提前感谢！
import tkinter as tk # python 3
from tkinter import font as tkfont
from typing_extensions import IntVar # python 3
class SampleApp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
self.title_font = tkfont.Font(family='Helvetica', size=18, weight="bold", slant="italic")
# the container is where we'll stack a bunch of frames
# on top of each other, then the one we want visible
# will be raised above the others
container = tk.Frame(self)
container.pack(side="top", fill="both", expand=True)
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.frames = {}
for F in (StartPage, PageOne):
page_name = F.__name__
frame = F(parent=container, controller=self)
self.frames[page_name] = frame
# put all of the pages in the same location;
# the one on the top of the stacking order
# will be the one that is visible.
frame.grid(row=0, column=0, sticky="nsew")
self.show_frame("StartPage")
def show_frame(self, page_name):
'''Show a frame for the given page name'''
frame = self.frames[page_name]
frame.tkraise()
def get_page(self, classname):
'''Returns an instance of a page given it's class name as a string'''
for page in self.frames.values():
if str(page.__class__.__name__) == classname:
return page
return None
class StartPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label = tk.Label(self, text="Start Page: insert value", font=controller.title_font)
label.pack(side="top", fill="x", pady=10)
self.some_input = tk.StringVar()
self.some_entry = tk.Entry(self, width=8)
self.some_entry.pack()
self.some_input = self.some_entry.get()
button1 = tk.Button(self, text='Next Page', command=lambda: controller.show_frame("PageOne"))
button1.pack()
class PageOne(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
start_page = self.controller.get_page('StartPage')
value = start_page.some_entry.get()
print ('The value stored in StartPage entry = %s' % start_page.some_input)
label = tk.Label(self, text="This is page 1, the value stored is" + str(value), font=controller.title_font)
label.pack(side="top", fill="x", pady=10)
button = tk.Button(self, text="Go to the start page",
command=lambda: controller.show_frame("StartPage"))
button.pack()
if __name__ == "__main__":
app = SampleApp()
app.mainloop()Stack Overflow用户
发布于 2021-07-06 21:58:31
您需要找到一种方法，当show_frame()显示标签时，通知PageOne更新标签，其中一种方法是使用event_generate()函数通过虚拟事件：
class SampleApp(tk.Tk):
...
def show_frame(self, page_name):
'''Show a frame for the given page name'''
frame = self.frames[page_name]
frame.tkraise()
# notify frame that it is raised via virtual event
frame.event_generate("<<Raised>>")
...
class PageOne(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
# save a reference of 'StartPage'
self.start_page = self.controller.get_page('StartPage')
# use instance variable 'self.label' instead of local variable 'label'
self.label = tk.Label(self, font=controller.title_font)
self.label.pack(side="top", fill="x", pady=10)
button = tk.Button(self, text="Go to the start page",
command=lambda: controller.show_frame("StartPage"))
button.pack()
# bind the virtual event
self.bind("<<Raised>>", self.on_raised)
def on_raised(self, event):
self.label.config(text=f"This is page 1, the value stored is '{self.start_page.some_entry.get()}'")页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/68271705
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