这个窗口为什么不居中？

Question

我正在使用此代码来中心我的屏幕，如this帖子和我的question所示，但令我惊讶的是，它并没有完全将窗口居中。它把它放在右下角而不是中心。为什么是这样？

top1=Toplevel(root) 
w = top1.winfo_screenwidth() 
h = top1.winfo_screenheight() 
topsize = tuple(int(_) for _ in top1.geometry().split('+')[0].split('x')) 
x = w/2 - topsize[0]/2 
y = h/2 - topsize[1]/2 
top1.geometry("+%d+%d" % (topsize[0]+x, topsize[1]+y)) 

由史蒂芬萨默斯

import Tkinter as tk 


def center_window(win): 
    w = win.winfo_screenwidth() 
    h = win.winfo_screenheight() 
    x = w/2 - win.winfo_width()/1-150 
    y = h/2 - win.winfo_height()/1-200 
    win.geometry("+%d+%d" % (x, y)) 

root = tk.Tk() 
top1 = tk.Toplevel(root) 
top1.title('TopLevel Window 1') 
top1.minsize(300, 300) 

b = tk.Label(top1, text='Here is a Label') 
b.pack() 
l = tk.Button(top1, text='Click Me') 
l.pack() 

top1.after(1, lambda: center_window(top1)) 

root.mainloop() 

Answer 1

需要调用root.after(delay, command)运行此。当您创建小部件并尝试初始化时，大小为1x1。这就是为什么你的价值在放置时不正确的原因。同样如对所引用问题的答案所述，使用.winfo_width() and .winfo_height()而不是通过几何来获取值。

import tkinter as tk 


def center_window(win): 
    w = win.winfo_screenwidth() 
    h = win.winfo_screenheight() 
    x = w/2 - win.winfo_width()/2 
    y = h/2 - win.winfo_height()/2 
    win.geometry("+%d+%d" % (x, y)) 

root = tk.Tk() 
top1 = tk.Toplevel(root) 
top1.title('TopLevel Window 1') 
top1.minsize(300, 300) 

b = tk.Label(top1, text='Here is a Label') 

top1.after(1, lambda: center_window(top1)) 

l = tk.Button(top1, text='Click Me') 

b.pack() 
l.pack() 

root.mainloop() 

Answer 2

最终解决方案，我认为它应该是

top1.geometry("+%d+%d" % (x, y))