[英]Python Tkinter how to change background color while frame is active
我對以下代碼有疑問:
def __init__(self):
window = Tkinter.Tk()
window.minsize(600,600)
window.maxsize(600,600)
window.title("test")
#window.iconbitmap('sample.ico')
menu_bar = Tkinter.Menu(window)
change_color_option = Tkinter.Menu(menu_bar, tearoff=0)
change_color_option.add_command(label = "Red", command = self.color_change(1, window))
change_color_option.add_command(label = "Blue", command = self.color_change(2, window))
change_color_option.add_command(label = "Yellow", command = self.color_change(3, window))
change_color_option.add_command(label = "Green", command = self.color_change(4, window))
change_color_option.add_command(label = "Purple", command = self.color_change(5, window))
change_color_option.add_command(label = "Brown", command = self.color_change(6, window))
file_menu_item = Tkinter.Menu(menu_bar, tearoff=0)
file_menu_item.add_command(label = "Quit", command = window.quit)
option_menu_item = Tkinter.Menu(menu_bar, tearoff=0)
option_menu_item.add_cascade(label = "change color", menu = change_color_option)
menu_bar.add_cascade(label="File", menu=file_menu_item)
menu_bar.add_cascade(label="Options", menu=option_menu_item)
window.config(menu=menu_bar)
window.mainloop()
def color_change(self, color, window):
if color == 1:
window.configure(background = "#CC0000")
elif color == 2:
window.configure(background = "#0000CC")
elif color == 3:
window.configure(background = "#FFFF00")
elif color == 4:
window.configure(background = "#336600")
elif color == 5:
window.configure(background = "#660099")
elif color == 6:
window.configure(background = "#663300")
但是我的問題是窗口將采用最后一種顏色(#663300),即使我按菜單按鈕更改顏色也不會改變。 我必須再次運行mainloop
,每次更改顏色時我都不想這樣做。 有什么辦法解決嗎?
要使用callback命令傳遞參數,您需要使用lambda
表達式。 否則,Tkinter將在制作小部件時執行回調,這就是為什么它會直接指向最后一個值的原因,因為這是流程流到達的最后一個值。
格式化lambda表達式,如下所示:
change_color_option.add_command(label = "Red", command = lambda: self.color_change(1, window))
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.