在單選按鈕選擇

Question

Python的標籤變化，我需要每一個我選擇一個不同的單選按鈕的時間來改變我的標籤背景顏色。

這裏是我的代碼的簡化例子。

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() 

我想他們改變這些條件多次，因爲我選擇不同的單選按鈕。

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" 

我可以請一些hep如何實現這一目標嗎？ 謝謝。

Answer 1

按照Tkinter docs at Effbot，可以回調添加到每個Radiobutton。通過command關鍵字傳遞可執行文件，該文件可以做任何你想做的事情。該選項在config下列出，但也可在__init__中獲得。在這種情況下，你可以把所需的代碼放到一個功能完全一樣，是和使用，作爲您的命令：

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() 
... 

...意味着你已經在這個問題的代碼。

的Effbot article on callback commands有一整節涉及使用相同的回調多個按鈕的確切情況。在你的情況，你已經通過使用Radio_Group規避了這個問題。

爲了讓你的代碼看起來更漂亮並移除巨頭嵌套的if語句，你可以用列表，元組和循環。請注意，索引已更改爲基於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)