Tkinter绑定不会调用功能 [英] Tkinter bind does not call funtion

问题描述

我正在尝试将tkinter条目小部件中的文本更改为用户输入的组合键(例如ShiftL + ShiftR)，python程序运行良好，但不更改条目，为什么以及如何更改修理它? 我的GUI:

I am trying to change the text in a tkinter entry widget, to be the key combination entered by the user(example: ShiftL+ShiftR), the python program runs fine, but does not change entry, why and how can i fix it? My GUI:

 # 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:

and ComboDetect:

   #this program was created by LadonAl (Alaa Youssef) in 25.May.17
    #it detects a combination of pressed key and stores them in a list and prints the list when at least
    # one of the keys is released

import time
import pyxhook

class ComboDetector(object):
    def getpressedkeys(self):
        return self.combo

我已经更改了按键功能以对其进行测试

I've changed the keyspressed function to test it

 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)

这是我注意到的: 当模块运行时，将"test"打印到控制台，其他任何事情都不会发生. 当我尝试在输入小部件之外单击并再次在其中单击(退出焦点并重新输入)时，没有任何反应

This is what I have noticed: When the module is run, "test" is printed to console, nothing else happens. When i try to click outside of the entry widget and click inside it again (exit focus and re-enter it), nothing happens

推荐答案

问题是，当您尝试绑定到KeyComboEntry时，您将调用过程KeysPressed，而不是将bind的方法传递给KeysPressed. c0>，则可以使用KeyComboEntry.bind("<Key>", self.KeysPressed, KeyComboEntry, self.KeyCombination)修复此问题.然后，绑定将使用KeyComboEntry和self.KeyCombination的参数调用KeysPressed.另一种选择是使用lambda函数，就像您在SaveButton中使用的那样，考虑到bind向它传递了一个事件.

The problem is that when you attempt to bind to KeyComboEntry, you are calling the procedure KeysPressed, rather than passing bind the method for KeyComboEntry, you can fix this by using KeyComboEntry.bind("<Key>", self.KeysPressed, KeyComboEntry, self.KeyCombination). Bind will then call KeysPressed with the arguments of KeyComboEntry and self.KeyCombination. The other alternative is to use a lambda function, as you have used for SaveButton, accounting for bind passing it an event.

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