Question

我正在尝试通过单选按钮更新TopLevel小部件的背景颜色。我想要的是在用户更改单选按钮时更改背景颜色。目前，该程序打开一个新窗口，带有一个单选按钮。背景颜色根本不会改变。

from tkinter import *

class Example:

    def newWindow(self):
        top = Toplevel()
        v = IntVar()
        v.set(-1)
        self.aRadioButton = Radiobutton(top, text="Blue",variable = v, value = 0)
        self.aRadioButton.grid(row=1, column=1)
        self.aRadioButton = Radiobutton(top, text="Red",variable = v, value = 1)
        self.aRadioButton.grid(row=1, column=0)

        if v == 0:
            top.configure(bg="Blue")
        elif v == 1:
            top.configure(bg="Red")


    def __init__(self, master):
        frame = Frame(master, width = 50, height = 50)
        frame.grid()

        self.aLabel = Label(frame, text = "New window bg colour").grid(row=0)

        self.aButton = Button(frame, text="To new window", command=self.newWindow)
        self.aButton.grid(row=1)

root = Tk()
app = Example(root)
root.mainloop()

Answer 1

更改单选按钮时必须使用事件。将命令方法附加到radiobuttons，如下所示：

self.aRadioButton = Radiobutton(top, text="Blue",variable = v, value = 0, command=lambda: top.configure(bg="Blue"))
self.aRadioButton = Radiobutton(top, text="Red",variable = v, value = 1, command=lambda: top.configure(bg="Red"))

此外，当您执行此操作时，如果仅将此变量用于此属性，则不需要变量v。

更新Toplevel小部件中的背景颜色

1 个答案: