【发布时间】：2019-11-02 12:00:02
【问题描述】：
我想做一个余额输入小部件，它只接受整数，值必须是 20 - 5000。我只制作了 int 标准，但我不知道如何处理 20 - 5000 的值限制。
我尝试制作一个执行 if 语句的“开始游戏按钮”，但它不会更新我在输入框中输入的值，它的开头默认为 0，即使它是按钮的命令功能.
如果有人知道解决方案，请给我提示！
@EDIT：下面是我的完整代码！
# Import modules
import tkinter as tk
class MainApplication(tk.Frame):
def __init__(self, master):
super().__init__(master)
self.master = master
self.window_geom = WindowsProperties(self.master)
self.master.withdraw()
# Opening first window as a Toplevel
def new_window(self):
self.first_window = tk.Toplevel(self.master)
self.app = FirstWindow(self.first_window)
class FirstWindow(tk.Frame):
def __init__(self, master):
super().__init__(master)
# Create all root objects:
self.window_geom = WindowsProperties(self.master)
self.root_buttons = FirstWindowButtons(self.master)
self.root_entry = FirstWindowEntry(self.master)
self.root_labels = FirstWindowLabels(self.master)
class FirstWindowEntry(tk.Frame):
# Class contain every button on a first screen, with its functions.
def __init__(self, master):
super().__init__(master)
self.player_name = tk.StringVar()
self.vcmd1 = self.register(self.callback_name)
self.player_name_entry = tk.Entry(
master,
textvariable=self.player_name,
font=("Verdana", 12),
width=15,
validate="all",
validatecommand=(self.vcmd1, "%P"),
)
self.player_name_entry.place(x=700, y=230)
self.player_name_entry.focus()
self.player_balance = tk.IntVar()
self.vcmd2 = self.register(self.callback_balance)
self.player_balance_entry = tk.Entry(
master,
textvariable=self.player_balance,
font=("Verdana", 12),
width=15,
validate="all",
validatecommand=(self.vcmd2, "%P"),
)
self.player_balance_entry.place(x=700, y=270)
# Method which validate if entered str is digit in Balance Entry
def callback_balance(self, P):
if len(P) <= 5 and (str.isdigit(P) or P == ""):
return True
else:
return False
# Method which validate if entered str is not longer than 15 characters in Player name Entry
def callback_name(self, P):
if len(P) <= 15:
return True
else:
return False
class FirstWindowButtons(FirstWindowEntry):
# Class contain every button on a first screen, with its functions.
def __init__(self, master):
super().__init__(master)
self.start_button = tk.Button(master, command=self.start_button_func)
self.start_button_img = tk.PhotoImage(
file="C:/Users/rjg5by/Scripts/venv/blackjack/start_button_img.png"
)
self.start_button.config(
image=self.start_button_img,
borderwidth=-10,
bg="black",
activebackground="black",
)
self.start_button.place(x=630, y=500)
self.quit_button = tk.Button(master, command=self.quit_button_func)
self.quit_button_img = tk.PhotoImage(
file="C:/Users/rjg5by/Scripts/venv/blackjack/quit_button_img.png"
)
self.quit_button.config(
image=self.quit_button_img,
borderwidth=-10,
bg="black",
activebackground="black",
)
self.quit_button.place(x=800, y=500)
def start_button_func(self):
print(self.player_balance.get())
if self.player_balance.get() >= 20:
root.deiconify() # Main game play windows appears
self.master.destroy() # Exit of first window
else:
print("Not enough ")
def quit_button_func(self):
root.destroy()
class FirstWindowLabels(tk.Frame):
# Class contain every button on a root screen, with its functions.
def __init__(self, master):
super().__init__(master)
self.player_name_label = tk.Label(
master, text="Player name:", font=("Verdana", 14)
)
self.player_name_label.config(fg="white", bg="black")
self.player_name_label.place(x=540, y=230)
self.player_balance_label = tk.Label(
master, text="Balance:", font=("Verdana", 14)
)
self.player_balance_label.config(fg="white", bg="black")
self.player_balance_label.place(x=540, y=270)
class WindowsProperties(tk.Frame):
# Class define windows main properties.
def __init__(self, master):
super().__init__(master)
self.width_of_window = 980
self.height_of_window = 604
self.screen_width = self.master.winfo_screenwidth()
self.screen_height = self.master.winfo_screenheight()
self.x_coordinate = int((self.screen_width / 2) - (self.width_of_window / 2))
self.y_coordinate = int(
(self.screen_height / 2) - (self.height_of_window / 2) - 30
)
self.master.geometry(
f"{self.width_of_window}x{self.height_of_window}+{self.x_coordinate}+{self.y_coordinate}"
)
self.master.resizable(width=False, height=False) # Resizable of a window
self.master.title("Blackjack") # Title of an application
if __name__ == "__main__":
root = tk.Tk()
app = MainApplication(root)
MainApplication.new_window(root)
root.mainloop()
第二次编辑：
@Mike - SMT 非常感谢您的帮助！我按照你的指示修改了我的代码，我注意到我需要把 self.图像变量以使其工作。在所有更正代码如下所示之后，我有一个关于从 MainApplication 类获取窗口属性的问题，我把方法 'window_properties()' 放在那里并在 TopLevel 窗口中运行它，但它没有得到它的属性，你可能有一些想法如何在不将相同代码放置在顶级风中的情况下获得它？ （没有方法它也没有得到合适的大小）
另外，请告诉我现在如何在 MainApp 类中获取 'self.player_name' 和 'self.player_balance' 值？
解决方案： 我已将这行 FirstWindow() 更改为 self.first_window = FirstWindow()
现在我可以通过self.first_window.player_balance 获得这个值，现在它可以工作了。
编辑：我减少了不必要的代码。
import tkinter as tk
class MainApplication(tk.Tk):
def __init__(self):
super().__init__()
self.window_properties()
self.withdraw()
self.new_window()
def new_window(self):
FirstWindow()
def window_properties(self):
width_of_window = 980
height_of_window = 604
screen_width = self.winfo_screenwidth()
screen_height = self.winfo_screenheight()
x_coordinate = int((screen_width / 2) - (width_of_window / 2))
y_coordinate = int((screen_height / 2) - (height_of_window / 2) - 30)
self.geometry(
f"{width_of_window}x{height_of_window}+{x_coordinate}+{y_coordinate}"
)
class FirstWindow(tk.Toplevel):
def __init__(self):
super().__init__()
# Defining variables
self.player_name = tk.StringVar()
self.player_balance = tk.IntVar()
self.master.window_properties()
self.vcmd1 = self.register(self.callback_name)
player_name_entry = tk.Entry(
self,
textvariable=self.player_name,
font=("Verdana", 12),
width=15,
validate="all",
validatecommand=(self.vcmd1, "%P"),
)
player_name_entry.place(x=700, y=230)
player_name_entry.focus()
self.vcmd2 = self.register(self.callback_balance)
player_balance_entry = tk.Entry(
self,
textvariable=self.player_balance,
font=("Verdana", 12),
width=15,
validate="all",
validatecommand=(self.vcmd2, "%P"),
)
player_balance_entry.place(x=700, y=270)
# Player balance Label widget
player_balance_label = tk.Label(self, text="Balance:", font=("Verdana", 14))
player_balance_label.config(fg="white", bg="black")
player_balance_label.place(x=540, y=270)
# Information about min/max balance Label widget
self.min_max_label = tk.Label(
self,
text="The balance should be between 20 and 5000 $.",
font=("Verdana", 10),
)
self.min_max_label.config(fg="white", bg="black")
self.min_max_label.place(x=540, y=310)
start_button = tk.Button(self, command=self.start_button_func)
start_button.config(
borderwidth=-10,
bg="black",
activebackground="black",
)
start_button.place(x=630, y=500)
quit_button = tk.Button(self, command=self.quit_button_func)
quit_button.config(borderwidth=-10, bg="black", activebackground="black"
)
quit_button.place(x=800, y=500)
# Method which validate if entered str is digit in Balance Entry
def callback_balance(self, P):
if len(P) <= 5 and (str.isdigit(P) or P == ""):
return True
else:
return False
# Method which validate if entered str is not longer than 15 characters in Player name Entry
def callback_name(self, P):
if len(P) <= 15:
return True
else:
return False
# This method checks if player typed a name, than checks if balance is 20-5000. If all statement are ok, move to main play game window
def start_button_func(self):
if self.player_name.get() == "":
self.min_max_label.config(
fg="red", bg="black", text="Please type your name."
)
elif self.player_balance.get() < 20:
self.min_max_label.config(
fg="red",
bg="black",
text="Please correct your balance value. It should be at least 20 $.",
)
elif self.player_balance.get() > 5000:
self.min_max_label.config(
fg="red",
bg="black",
text="Please correct your balance value. Maximum is 5000 $.",
)
else:
self.master.deiconify() # Main game play windows appears
self.destroy() # Exit of first window
# Quiting whole game button
def quit_button_func(self):
self.master.destroy()
if __name__ == "__main__":
MainApplication().mainloop()
【问题讨论】：
-
为什么你认为变量没有被更新？当我添加足够的代码来运行您的代码并查看变量时，它似乎正在更新。请提供一个完整的minimal reproducible example。
-
start_button_func：Edit 你的问题并展示你如何调用这个函数。 -
此
print(player_balance.get())应为print(self.player_balance.get())。 -
我们不需要整个代码。一个写得很好的问题应该包括minimal reproducible example。
标签： python tkinter tkinter-entry