Question

我想填充一个页面列表，如果从tk界面中单击可以访问这些页面。每个链接旁边都有一个计数器，可以使用+1和-1按钮进行更新；全都在一条线上。所以它应该看起来像： linkl1计数器+ 1button -1button

linkl2计数器+1按钮-1按钮

linkl3计数器+ 1button -1button等...

我有2个我无法解决的问题：1-单击链接在浏览器中无法打开2-单击+1或-1按钮不会更新链接计数器。有人可以帮我吗？这是代码：

<bbb name="b3"/>

Answer 1

要使计数器起作用，您需要使用functools.partial来使“闭包”用作命令。

from functools import partial
#...
self.Plus1Button = tk.Button(self.bottomframe, text = "+1", command=partial(self.plus1, url), bg="green")

要使url打开，您只需要阅读错误消息即可。您在回调函数中缺少参数。试试：

def callback(self, event):
    webbrowser.open_new(event.widget.cget("text"))

Answer 2

您有一组适合逻辑组（一行）的数据和函数……这应该让您大吃一惊，因为它应该是自己的类。这样会更整洁：

import random
import tkinter as tk
import webbrowser

class Pierre:
    """This class holds all the objects, data and functions for a single line"""
    def __init__(self, master, url):
        self.url = url
        self.counter = 0
        _, i = master.grid_size() # get the current row number

        lbl = tk.Label(master, text=url, fg="blue", cursor="hand2")
        lbl.grid(row=i, column=1)
        lbl.bind("<Button-1>", self.callback)

        self.DisplayButton = tk.Button(master, text = self.counter)
        self.DisplayButton.grid(row=i, column=2)
        self.DisplayButton.config(height = 1, width = 1 )

        self.Plus1Button = tk.Button(master, text = "+1", command=self.plus1, bg="green")
        self.Plus1Button.grid(row=i, column=3)
        self.Plus1Button.config(height = 1, width = 1 )

        self.Neg1Button = tk.Button(master, text = "-1", command=self.neg1, bg="green")
        self.Neg1Button.grid(row=i, column=4)
        self.Neg1Button.config(height = 1, width = 1 )

    def plus1(self):
        self.counter += 1
        self.DisplayButton["text"]=str(self.counter)

    def neg1(self):
        self.counter -= 1
        self.DisplayButton["text"]=str(self.counter)

    def callback(self, event):
        webbrowser.open_new(self.url)

class TestClass(tk.Tk):
    def __init__(self, **kwargs):
        tk.Tk.__init__(self, **kwargs)
        self.title('Test')

        self.topframe = tk.Frame(self)
        self.topframe.pack( side = tk.TOP, pady=30)

        self.bottomframe = tk.Frame(self)
        self.bottomframe.pack( side = tk.BOTTOM )

        self.button = tk.Button(self.topframe, text='Click', command = self.output_value)
        self.button.pack(side="left", fill="both", expand=True)

 ####define the function that the submit button will do
    def output_value(self):
        urls = ["http://www.google.com", "http://www.facebook.com"]
        for url in urls:
            Pierre(self.bottomframe, url)

if __name__ == "__main__":
    root = TestClass()
    root.mainloop()

此外，您不应该这样定义类变量（类中的变量，而不是方法中的变量）。实际上，在您了解非常有用的罕见情况之前，请完全远离类变量。

Answer 3

@Novel方法的一种变体是使用数据绑定，并且如果有界变量由于某种原因而改变，则让按钮自动更新其文本。

class Pierre:
    """This class holds all the objects, data and functions for a single line"""
    def __init__(self, master, url):
        self.url = url
        self.counter = tk.IntVar(value=0)
        _, i = master.grid_size() # get the current row number

        lbl = tk.Label(master, text=url, fg="blue", cursor="hand2")
        lbl.grid(row=i, column=1)
        lbl.bind("<Button-1>", self.callback)

        self.DisplayButton = tk.Button(master, textvariable = self.counter)
        self.DisplayButton.grid(row=i, column=2)
        self.DisplayButton.config(height = 1, width = 1 )

        self.Plus1Button = tk.Button(master, text = "+1", command=self.plus1, bg="green")
        self.Plus1Button.grid(row=i, column=3)
        self.Plus1Button.config(height = 1, width = 1 )

        self.Neg1Button = tk.Button(master, text = "-1", command=self.neg1, bg="green")
        self.Neg1Button.grid(row=i, column=4)
        self.Neg1Button.config(height = 1, width = 1 )

    def plus1(self):
        self.counter.set(self.counter.get() + 1)

    def neg1(self):
        self.counter.set(self.counter.get() - 1)

    def callback(self, event):
        webbrowser.open_new(self.url)

通过tk通过+1和-1按钮进行动态标签和评分

3 个答案: