Question

每次选择不同的单选按钮时，我都需要更改标签背景颜色。

以下是我的代码的简化示例。

Main_Window = Tk()
Main_Window.title("Main Window")
Main_Window.geometry("500x500+25+25")

Label_1 = Label(Main_Window, text="Label 1", width=8, bg=Label_1_Color, fg="black", bd=2, relief=RIDGE, padx=2, pady=2)
Label_1.pack(side=TOP, anchor=W)
Label_2 = Label(Main_Window, text="Label 2", width=8, bg=Label_2_Color, fg="black", bd=2, relief=RIDGE, padx=2, pady=2)
Label_2.pack(side=TOP, anchor=W)
Label_3 = Label(Main_Window, text="Label 3", width=8, bg=Label_3_Color, fg="black", bd=2, relief=RIDGE, padx=2, pady=2)
Label_3.pack(side=TOP, anchor=W)
Label_4 = Label(Main_Window, text="Label 4", width=8, bg=Label_4_Color, fg="black", bd=2, relief=RIDGE, padx=2, pady=2)
Label_4.pack(side=TOP, anchor=W)

Radio_Group = IntVar()
Radio_1 = Radiobutton(Main_Window, text="Option 1", bg="white", variable=Radio_Group, value=1)
Radio_1.pack(side=BOTTOM, anchor=W)
Radio_1.invoke()
Radio_2 = Radiobutton(Main_Window, text="Option 2", bg="white", variable=Radio_Group, value=2)
Radio_2.pack(side=BOTTOM, anchor=W)
Radio_3 = Radiobutton(Main_Window, text="Option 3", bg="white", variable=Radio_Group, value=3)
Radio_3.pack(side=BOTTOM, anchor=W)
Radio_4 = Radiobutton(Main_Window, text="Option 4", bg="white", variable=Radio_Group, value=4)
Radio_4.pack(side=BOTTOM, anchor=W)
Radio_5 = Radiobutton(Main_Window, text="Option 5", bg="white", variable=Radio_Group, value=5)
Radio_5.pack(side=BOTTOM, anchor=W)

Main_Window.mainloop()

我希望他们在选择不同的单选按钮时多次更改这些条件。

if Radio_Group.get() == 1:
    Label_1_Color = "white"
    Label_2_Color = "white"
    Label_3_Color = "white"
    Label_4_Color = "white"
elif Radio_Group.get() == 2:
    Label_1_Color = "red"
    Label_2_Color = "white"
    Label_3_Color = "white"
    Label_4_Color = "white"
elif Radio_Group.get() == 3:
    Label_1_Color = "white"
    Label_2_Color = "red"
    Label_3_Color = "white"
    Label_4_Color = "white"
elif Radio_Group.get() == 4:
    Label_1_Color = "white"
    Label_2_Color = "white"
    Label_3_Color = "red"
    Label_4_Color = "white"
else:
    Label_1_Color = "white"
    Label_2_Color = "white"
    Label_3_Color = "white"
    Label_4_Color = "red"

我能否详细了解如何实现这一目标？谢谢。

Answer 1

根据Tkinter docs at Effbot，您可以为每个Radiobutton添加回调。使用command关键字传递一个可调用的函数，该关键字可以执行任何操作。该选项列在config下，但也可在__init__中找到。在这种情况下，您可以将所需的代码完全按原样转换为函数，并将其用作命令：

Main_Window = Tk()
Main_Window.title("Main Window")
Main_Window.geometry("500x500+25+25")

Label_1 = Label(Main_Window, text="Label 1", width=8, bg=Label_1_Color, fg="black", bd=2, relief=RIDGE, padx=2, pady=2)
Label_1.pack(side=TOP, anchor=W)
...

Radio_Group = IntVar()

def setColor():
    if Radio_Group.get() == 1:
        Label_1.configure(background="white")
        Label_2.configure(background="white")
        Label_3.configure(background="white")
        Label_4.configure(background="white")
    ...

Radio_1 = Radiobutton(Main_Window, text="Option 1", bg="white", variable=Radio_Group, value=1, command=setColor)
Radio_1.pack(side=BOTTOM, anchor=W)
Radio_1.invoke()
...

...表示您在问题中已有的代码。

Effbot article on callback commands有一整节涉及使用相同回调的多个按钮的确切情况。在您的情况下，您已使用Radio_Group来解决问题。

为了使您的代码看起来更漂亮并删除巨大的嵌套if语句，您可以使用列表，元组和循环。请注意，索引已更改为0。例如：

Main_Window = Tk()
Main_Window.title("Main Window")
Main_Window.geometry("500x500+25+25")

# A dictionary keyed by radio button containing sequences of colors for each label

labels = []
#labelCount = 4
for i in range(labelCount):
    label = Label(Main_Window, text="Label {}".format(i + 1), width=8, bg='white', fg="black", bd=2, relief=RIDGE, padx=2, pady=2))
    label.pack(side=TOP, anchor=W)
    labels.append(label)

Radio_Group = IntVar()

def setColor():
    radioIndex = Radio_Group.get()
    for labelIndex in range(labelCount):
        if labelIndex == radioIndex - 1:
            color = 'red'
        else:
            color = 'white'
        labels[labelIndex].configure(background=color)

radios = []
#radioCount = 5
for i in range(radioCount):
    radio = Radiobutton(Main_Window, text="Option {}".format(i + 1), bg="white", variable=Radio_Group, value=i, command=setColor)
    radio.pack(side=BOTTOM, anchor=W)
    if i == 0:
        radio.invoke()
    radios.append(radio)

根据radiobutton选择更改Python标签

1 个答案: