如何将回车键绑定到 tkinter 中的函数? [英] How do I bind the enter key to a function in tkinter?

问题描述

我是 Python 初学者，在 MacOS 上运行.

I am a Python beginning self-learner, running on MacOS.

我正在 tkinter 中制作一个带有文本解析器 GUI 的程序，您可以在其中在 Entry 小部件中键入一个命令，然后点击一个 Button 小部件，这会触发我的parse() 函数等，将结果打印到 Text 小部件，文本冒险风格.

I'm making a program with a text parser GUI in tkinter, where you type a command in a Entry widget, and hit a Button widget, which triggers my parse() funct, ect, printing the results to a Text widget, text-adventure style.

>绕过按钮

我不能让你那样做，戴夫.

I can't let you do that, Dave.

我试图找到一种方法来摆脱每次用户发出命令时都将鼠标拖到 Button 上的需要，但结果比我想象的要难.

I'm trying to find a way to get rid of the need to haul the mouse over to the Button every time the user issues a command, but this turned out harder than I thought.

我猜正确的代码看起来像 self.bind('<Return>', self.parse())?但我什至不知道把它放在哪里.root、__init__、parse() 和 create_widgets() 不想要它.

I'm guessing the correct code looks like self.bind('<Return>', self.parse())? But I don't even know where to put it. root, __init__, parse(), and create_widgets() don't want it.

需要明确的是，任何人都应该在 prog 中按 Enter 的唯一原因是触发 parse()，因此不需要支持 Entry特别是小部件.它在任何地方都很好.

To be clear, the only reason anyone should hit enter in the prog is to trigger parse(), so it doesn't need to be espoused to the Entry widget specifically. Anywhere it works is fine.

响应7stud，基本格式:

In response to 7stud, the basic format:

from tkinter import *
import tkinter.font, random, re

class Application(Frame):
    
    def __init__(self, master):
        Frame.__init__(self, master, ...)
        self.grid()
        self.create_widgets()
        self.start()

        
    def parse(self):
        ...


    def create_widgets(self):
        
        ...

        self.submit = Button(self, text= "Submit Command.", command= self.parse, ...)
        self.submit.grid(...)

        
root = Tk()
root.bind('<Return>', self.parse)

app = Application(root)

root.mainloop()

推荐答案

尝试运行以下程序.你只需要确保你的窗口在你点击 Return 时有焦点——为了确保它有焦点，首先点击按钮几次直到你看到一些输出，然后不要点击其他任何地方点击 Return.

Try running the following program. You just have to be sure your window has the focus when you hit Return--to ensure that it does, first click the button a couple of times until you see some output, then without clicking anywhere else hit Return.

import tkinter as tk

root = tk.Tk()
root.geometry("300x200")

def func(event):
    print("You hit return.")
root.bind('<Return>', func)

def onclick():
    print("You clicked the button")

button = tk.Button(root, text="click me", command=onclick)
button.pack()

root.mainloop()

然后，在使 button click 和 hiting Return 调用相同的函数时，您只需稍微调整一下 - 因为命令函数需要是一个函数不接受任何参数，而绑定函数需要是一个接受一个参数(事件对象)的函数:

Then you just have tweak things a little when making both the button click and hitting Return call the same function--because the command function needs to be a function that takes no arguments, whereas the bind function needs to be a function that takes one argument(the event object):

import tkinter as tk

root = tk.Tk()
root.geometry("300x200")

def func(event):
    print("You hit return.")

def onclick(event=None):
    print("You clicked the button")

root.bind('<Return>', onclick)

button = tk.Button(root, text="click me", command=onclick)
button.pack()

root.mainloop()

或者，您可以放弃使用按钮的命令参数，而是使用 bind() 将 onclick 函数附加到按钮上，这意味着该函数需要接受一个参数——就像使用 Return 一样:

Or, you can just forgo using the button's command argument and instead use bind() to attach the onclick function to the button, which means the function needs to take one argument--just like with Return:

import tkinter as tk

root = tk.Tk()
root.geometry("300x200")

def func(event):
    print("You hit return.")

def onclick(event):
    print("You clicked the button")

root.bind('<Return>', onclick)

button = tk.Button(root, text="click me")
button.bind('<Button-1>', onclick)
button.pack()

root.mainloop()

这是在类设置中:

import tkinter as tk

class Application(tk.Frame):
    def __init__(self):
        self.root = tk.Tk()
        self.root.geometry("300x200")

        tk.Frame.__init__(self, self.root)
        self.create_widgets()

    def create_widgets(self):
        self.root.bind('<Return>', self.parse)
        self.grid()

        self.submit = tk.Button(self, text="Submit")
        self.submit.bind('<Button-1>', self.parse)
        self.submit.grid()

    def parse(self, event):
        print("You clicked?")

    def start(self):
        self.root.mainloop()


Application().start()

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