python - tkinter:创建空根窗口时如何不显示它

Question

我有一个创建窗口的简单脚本:

import Tkinter as tk

def center(win):
  win.update_idletasks()
  width = win.winfo_width()
  frm_width = win.winfo_rootx() - win.winfo_x()
  win_width = width + 2 * frm_width
  height = win.winfo_height()
  titlebar_height = win.winfo_rooty() - win.winfo_y()
  win_height = height + titlebar_height + frm_width
  x = win.winfo_screenwidth() // 2 - win_width // 2
  y = win.winfo_screenheight() // 2 - win_height // 2
  win.geometry('{}x{}+{}+{}'.format(width, height, x, y))

def showDialog():
  print "tkinter"
  root = tk.Tk()
  root.title("Say Hello")
  label = tk.Label(root, text="Hello World")
  label.pack(side="top", fill="both", expand=True, padx=20, pady=20)
  button = tk.Button(root, text="OK", command=lambda: root.destroy())
  button.pack(side="bottom", fill="none", expand=True, padx=10, pady=10)
  center(root)
  root.attributes("-topmost", True)
  root.mainloop()

showDialog()

运行此脚本时，第一个空窗口会显​​示在屏幕的左上角，然后完整的窗口会显示在屏幕中央。

我不想看到第一个空窗口(它只出现几毫秒，但这不太好)

我怎样才能做到这一点？

Answer 1

使用以下两种方法来隐藏或显示根窗口。

def hide(root):
    root.withdraw()

def show(root):
    root.update()
    root.deiconify()

当您将根窗口的大小设置为 (1, 1) 居中时，您应该将窗口大小指定给 center 方法。
这里不需要lambda，使用command=root.destroy。

import Tkinter as tk

def center(win, width, height):
  win.update_idletasks()
  frm_width = win.winfo_rootx() - win.winfo_x()
  win_width = width + 2 * frm_width
  titlebar_height = win.winfo_rooty() - win.winfo_y()
  win_height = height + titlebar_height + frm_width
  x = win.winfo_screenwidth() // 2 - win_width // 2
  y = win.winfo_screenheight() // 2 - win_height // 2
  win.geometry('{}x{}+{}+{}'.format(width, height, x, y))

def show(root):
    root.update()
    root.deiconify()

def hide(root):
    root.withdraw()

def showDialog():
  print "tkinter"
  root = tk.Tk()
  hide(root)
  root.title("Say Hello")
  label = tk.Label(root, text="Hello World")
  label.pack(side="top", fill="both", expand=True, padx=20, pady=20)
  button = tk.Button(root, text="OK", command=root.destroy)
  button.pack(side="bottom", fill="none", expand=True, padx=10, pady=10)
  center(root, width=200, height=200)
  show(root)
  root.mainloop()

showDialog()