Python-Tkinter Scrollbar

Python offers multiple options for developing a GUI (Graphical User Interface). Out of all the GUI methods, Tkinter is the most commonly used method. It is a standard Python interface to the Tk GUI toolkit shipped with Python. Python with Tkinter is the fastest and easiest way to create GUI applications. Creating a GUI using Tkinter is an easy task.

Note: For more information, refer to Python GUI – tkinter

Scrollbar Widget

The scrollbar widget is used to scroll down the content. We can also create the horizontal scrollbars to the Entry widget.

Syntax:
The syntax to use the Scrollbar widget is given below.

w = Scrollbar(master, options) 

Parameters:

• master: This parameter is used to represents the parent window.
• options: There are many options which are available and they can be used as key-value pairs separated by commas.

Options:
Following are commonly used Option can be used with this widget :-

• activebackground: This option is used to represent the background color of the widget when it has the focus.
• bg: This option is used to represent the background color of the widget.
• bd: This option is used to represent the border width of the widget.
• command: This option can be set to the procedure associated with the list which can be called each time when the scrollbar is moved.
• cursor: In this option, the mouse pointer is changed to the cursor type set to this option which can be an arrow, dot, etc.
• elementborderwidth: This option is used to represent the border width around the arrow heads and slider. The default value is -1.
• Highlightbackground: This option is used to focus highlighcolor when the widget doesn’t have the focus.
• highlighcolor: This option is used to focus highlighcolor when the widget has the focus.
• highlightthickness: This option is used to represent the thickness of the focus highlight.
• jump: This option is used to control the behavior of the scroll jump. If it set to 1, then the callback is called when the user releases the mouse button.
• orient: This option can be set to HORIZONTAL or VERTICAL depending upon the orientation of the scrollbar.
• repeatdelay: This option tells the duration up to which the button is to be pressed before the slider starts moving in that direction repeatedly. The default is 300 ms.
• repeatinterval: The default value of the repeat interval is 100.
• takefocus: You can tab the focus through a scrollbar widget
• troughcolor: This option is used to represent the color of the trough.
• width: This option is used to represent the width of the scrollbar.

Methods:
Methods used in this widgets are as follows:

• get(): This method is used to returns the two numbers a and b which represents the current position of the scrollbar.
• set(first, last): This method is used to connect the scrollbar to the other widget w. The yscrollcommand or xscrollcommand of the other widget to this method.

Example:

from tkinter import *

root = Tk()
root.geometry("150x200")

w = Label(root, text ='GeeksForGeeks',
          font = "50")

w.pack()

scroll_bar = Scrollbar(root)

scroll_bar.pack( side = RIGHT,
                fill = Y )

mylist = Listbox(root,
                 yscrollcommand = scroll_bar.set )

for line in range(1, 26):
    mylist.insert(END, "Geeks " + str(line))

mylist.pack( side = LEFT, fill = BOTH )

scroll_bar.config( command = mylist.yview )

root.mainloop()

Output: