An Introduction to Tkinter
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# Patterns

The `Scrollbar` widget is almost always used in conjunction with a `Listbox`, `Canvas`, or `Text` widget. Horizontal scrollbars can also be used with the `Entry` widget.

To connect a vertical scrollbar to such a widget, you have to do two things:

1. Set the widget's `yscrollcommand` callbacks to the `set` method of the scrollbar.

2. Set the scrollbar's `command` to the `yview` method of the widget.

Example 40-1. Connecting a scrollbar to a listbox

    # scrollbar-example-1.py

    from Tkinter import *

    root = Tk()

    scrollbar = Scrollbar(root)
    scrollbar.pack(side=RIGHT, fill=Y)

    listbox = Listbox(root, yscrollcommand=scrollbar.set)
    for i in range(1000):
        listbox.insert(END, str(i))
    listbox.pack(side=LEFT, fill=BOTH)

    scrollbar.config(command=listbox.yview)

    mainloop()

When the widget view is modified, the widget notifies the scrollbar by calling the `set` method. And when the user manipulates the scrollbar, the widget's `yview` method is called with the appropriate arguments.

Adding a horizontal scrollbar is as simple. Just use the `xscrollcommand` option, and the `xview` method.

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