如何将Enter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入门自学者，在MacOS上运行.

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

我正在tkinter中使用文本解析器GUI编写程序，在其中您在Entry小部件中键入命令，然后单击Button小部件，这将触发我的parse()功能，以打印结果.到Text小部件(文字冒险风格).

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.

>绕开按钮

> Circumvent the button

我不能让你那样，戴夫.

I can't let you do that, Dave.

我正在尝试寻找一种方法，以消除每次用户发出命令时都将鼠标拖到Button上的需要，但是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())吗?但我什至不知道该放在哪里. root，__init__，parse()和create_widgets()不需要它.

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.

要清楚，任何人都应该在编中按回车键的唯一原因是触发parse()，因此不需要专门支持Entry小部件.任何可行的方法都很好.

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.您只需要确保在单击返回"时您的窗口具有焦点即可–要确保确实如此，请先多次单击按钮，直到看到一些输出，然后再单击其他任何位置，然后单击返回".

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，当使button click和hitting Return都调用相同的函数时，您只需稍作调整-因为命令函数需要是一个不带参数的函数，而bind函数需要是一个不带参数的函数.需要一个参数(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，而使用bind()将onclick函数附加到按钮，这意味着该函数需要一个参数-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()

这里是在课堂设置中:

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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