如何在 Tkinter 列表框中插入时添加自动滚动?

问题描述

我正在使用列表框(带有滚动条)进行日志记录:

I'm using a listbox (with scrollbar) for logging:

self.listbox_log = Tkinter.Listbox(root, height = 5, width = 0,)
self.scrollbar_log = Tkinter.Scrollbar(root,)

self.listbox_log.configure(yscrollcommand = self.scrollbar_log.set)
self.scrollbar_log.configure(command = self.listbox_log.yview)

现在，当我这样做时:

Now, when I do:

self.listbox_log.insert(END,str)

我希望选择插入的元素.我试过了:

I want the inserted element to be selected. I've tried:

self.listbox_log.selection_anchor(END)

但这不起作用...请提出解决方案...

but that doesn't work... Please suggest a solution...

推荐答案

AFAIK ScrollBar 小部件没有自动滚动功能，但可以通过调用 listBox 轻松实现yview() 方法在您插入新项目后.如果您需要选择新项目，那么您也可以使用 listbox 的 select_set 方法手动完成.

AFAIK the ScrollBar widget doesn't have an auto-scroll feature, but it can be easily implemented by calling the listBox's yview() method after you insert a new item. If you need the new item to be selected then you can do that manually too using the listbox's select_set method.

from Tkinter import *

class AutoScrollListBox_demo:
    def __init__(self, master):
        frame = Frame(master, width=500, height=400, bd=1)
        frame.pack()

        self.listbox_log = Listbox(frame, height=4)
        self.scrollbar_log = Scrollbar(frame) 

        self.scrollbar_log.pack(side=RIGHT, fill=Y)
        self.listbox_log.pack(side=LEFT,fill=Y) 

        self.listbox_log.configure(yscrollcommand = self.scrollbar_log.set)
        self.scrollbar_log.configure(command = self.listbox_log.yview)

        b = Button(text="Add", command=self.onAdd)
        b.pack()

        #Just to show unique items in the list
        self.item_num = 0

    def onAdd(self):
        self.listbox_log.insert(END, "test %s" %(str(self.item_num)))       #Insert a new item at the end of the list

        self.listbox_log.select_clear(self.listbox_log.size() - 2)   #Clear the current selected item     
        self.listbox_log.select_set(END)                             #Select the new item
        self.listbox_log.yview(END)                                  #Set the scrollbar to the end of the listbox

        self.item_num += 1


root = Tk()
all = AutoScrollListBox_demo(root)
root.title('AutoScroll ListBox Demo')
root.mainloop()

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