使用 tkinter 創建一個選擇列表對話框

Question

我正在嘗試使用 tkinter a function 類似於 easygui 的按鈕框（ http://easygui.sourceforge.net/tutorial.html#buttonbox ），我應該能夠從控制台和 gui 應用程序調用它：

from tkinter import *
def mychoicebox(choicelist): 
    def buttonfn(): 
        return var.get()
    choicewin = Tk()
    choicewin.resizable(False, False)
    choicewin.title("ChoiceBox")

    Label(choicewin, text="Select an item:").grid(row=0, column=0, sticky="W")

    var = StringVar(choicewin)
    var.set('No data') # default option
    popupMenu = OptionMenu(choicewin, var, *choicelist)
    popupMenu.grid(sticky=N+S+E+W, row =1, column = 0)

    Button(choicewin, text='Done', command=buttonfn).grid(row=2, column=0)
    choicewin.mainloop()

測試：

reply = mychoicebox(['one','two','three'])
print("reply:", reply)

它創建了一個 window 和 label、選擇列表和按鈕，但是當按下“完成”按鈕時它不返回所選項目。 我怎樣才能使這項工作？

Answer 1

微小的修改將使它像你想要的那樣工作。 結果是由按鈕 function 返回的，而不是由外部 function 返回的。通過在您的 function 中使其成為全局，外部 function 能夠返回它。 注意：您還必須跳出主循環，以便外部 function 完成：

from tkinter import *

def mychoicebox(choicelist):
    global result

    def buttonfn():
        global result
        result = var.get()
        choicewin.quit()

    choicewin = Tk()
    choicewin.resizable(False, False)
    choicewin.title("ChoiceBox")

    Label(choicewin, text="Select an item:").grid(row=0, column=0, sticky="W")

    var = StringVar(choicewin)
    var.set("No data")  # default option
    popupMenu = OptionMenu(choicewin, var, *choicelist)
    popupMenu.grid(sticky=N + S + E + W, row=1, column=0)

    Button(choicewin, text="Done", command=buttonfn).grid(row=2, column=0)
    choicewin.mainloop()
    return result

# Testing:

reply = mychoicebox(["one", "two", "three"])
print("reply:", reply)

Answer 2

它有點重新布置成一類，但這是您想要做的嗎？

from tkinter import *

class Choices:

    def __init__(self, parent, choicelist):

        Label(choicewin, text="Select an item:").grid(row=0, column=0, sticky="W")

        self.var = StringVar()
        self.var.set('No data') # default option
        popupMenu = OptionMenu(choicewin, self.var, *choicelist)
        popupMenu.grid(sticky=N+S+E+W, row =1, column = 0)

        Button(choicewin, text='Done', command=self.buttonfn).grid(row=2, column=0)

    def buttonfn(self): 
        print(self.var.get())

if __name__ == '__main__':
    choicewin = Tk()
    choicewin.resizable(False, False)
    choicewin.title("ChoiceBox")
    app = Choices(choicewin, ['one','two','three'])
    choicewin.mainloop()