Python Tkinter

The Scale widget allows the user to select a numerical value by moving a “slider” knob along a scale.

Syntax:

S = Scale(root, bg, fg, bd, command, orient, from_, to, ..) 

Option Parameters

• root – root window.

• bg – background colour

• fg – foreground colour

• bd – border

• orient – orientation(vertical or horizontal)

• from_ – starting value

• to – ending value

• troughcolor – set colour for trough.

• state – decides if the widget will be responsive or unresponsive.

• sliderlength – decides the length of the slider.

• label – to display label in the widget.

• highlightbackground – the colour of the focus when widget is not focused.

• cursor – The cursor on the widget ehich could be arrow, circle, dot etc.

Methods

• set(value) – set the value for scale.

• get() – get the value of scale.

Example:

from Tkinter import *

master = Tk()

w = Scale(master, from_=0, to=100)
w.pack()

w = Scale(master, from_=0, to=200, orient=HORIZONTAL)
w.pack()

mainloop()

Tkinter Scrollbar

The Scrollbar widget is almost always used in conjunction with a Listbox, Canvas, or Text widget.

Syntax:

w = Scrollbar ( master, option, ... )

Here:

• master − This represents the parent window.

• options − Here is the list of most commonly used options for this widget.

Example;

from Tkinter import *

master = Tk()

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

listbox = Listbox(master, 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()

There are many options which is used in this:

• activebackground

• bg

• bd

• cursor

• elementborderwidth

• highlightbackground

• highlightcolor

• highlightthickness

• jump

• orient

• repeatdelay

• repeatinterval

Use of these option

activebackground

The color of the slider and arrowheads when the mouse is over them.

bg

The color of the slider and arrowheads when the mouse is not over them.

bd

The width of the 3-d borders around the entire perimeter of the trough

command

A procedure to be called whenever the scrollbar is moved.

cursor

The cursor that appears when the mouse is over the scrollbar.

elementborderwidth

The width of the borders around the arrowheads and slider.

highlightbackground

The color of the focus highlight when the scrollbar does not have focus.

highlightcolor

The color of the focus highlight when the scrollbar has the focus.

orient

Set orient=HORIZONTAL for a horizontal scrollbar, orient=VERTICAL for a vertical one.