Tkinter绑定不调用函数

Question

我正在尝试更改tkinter条目小部件中的文本，使其成为用户输入的键组合（例如：ShiftL+ShiftR），python程序运行良好，但不更改条目，为什么以及如何修复它？ 我的图形用户界面：

 # Program by Fares Al Ghazy started 20/5/2017
# Python script to assign key combinations to bash commands, should run in the background at startup
# Since this program is meant to release bash code, it is obviously non-system agnostic and only works linux systems that use BASH
# This is one file which only creates the GUI, another file is needed to use the info taken by this program

FileName  = 'BinderData.txt'
import tkinter as tk
from ComboDetect import ComboDetector

# Create a class to get pressed keys and print them
KeyManager = ComboDetector()


# Class that creates GUI and takes info to save in file

class MainFrame(tk.Tk):
    # variable to store pressed keys
    KeyCombination = ""

    def KeysPressed(self, Entry, KeyCombination):
        KeyCombination = KeyManager.getpressedkeys()
        Entry.delete(0, tk.END)
        Entry.insert(0, KeyCombination)

    # constructor

    def __init__(self, FileName, **kwargs):
        tk.Tk.__init__(self, **kwargs)
        # create GUI to take in key combinations and bash codes, then save them in file
        root = self  # create new window
        root.wm_title("Key binder")  # set title
        #  create labels and text boxes
        KeyComboLabel = tk.Label(root, text="Key combination = ")
        KeyComboEntry = tk.Entry(root)

        # Bind function to entry

        KeyComboEntry.bind('<FocusIn>',self.KeysPressed(KeyComboEntry, self.KeyCombination))

        KeyComboEntry.grid(row=0, column=1)
        ActionEntry.grid(row=1, column=1)
        # create save button
        SaveButton = tk.Button(root, text="save",
                               command=lambda: self.SaveFunction(KeyComboEntry, ActionEntry, FileName))
        SaveButton.grid(row=2, column=2, sticky=tk.E)


app = MainFrame(FileName)
app.mainloop()

和ComboDetect：

^{pr2}$

编辑：我已经改变了按键功能来测试它

 def KeysPressed(self, Entry, KeyCombination):
        Entry.config(state="normal")
        Entry.insert(tk.END, "Test")
        print("test")
        KeyCombination = KeyManager.getpressedkeys()
        Entry.delete(0, tk.END)
        Entry.insert(tk.END, KeyCombination)

我注意到： 当模块运行时，“test”被打印到console上，其他什么都不会发生。 当我尝试单击entry小部件的外部并再次单击它内部时（退出focus并重新进入它），什么都不会发生

Answer 1

问题是，当您试图绑定到KeyComboEntry时，您调用的是过程KeysPressed，而不是将bind传递给{}的方法，您可以使用KeyComboEntry.bind("<Key>", self.KeysPressed, KeyComboEntry, self.KeyCombination)来解决这个问题。Bind将使用KeyComboEntry和{}的参数调用KeysPressed。另一种选择是使用lambda函数，就像您在SaveButton中使用的一样，说明bind向它传递一个事件。在