Python Tkinter Scale Widget
Python Tkinter Scale
The Scale widget in Python’s Tkinter library provides a graphical slider that allows users to select a value from a defined range. It is particularly useful when the user needs to pick a numerical value within a set limit, offering an intuitive alternative to an Entry widget.
With Tkinter’s Scale, developers can control the minimum and maximum values, resolution, and orientation, ensuring a seamless user experience. The widget is widely used in applications where adjustable values are needed, such as volume control, brightness settings, or data selection.
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Syntax
w = Scale(parent, options)
Here, parent is the root window or frame, and options define the properties of the Scale widget.
Tkinter Scale Widget Options
Below is a list of useful options available for configuring the Scale widget:
| SN | Option | Description |
|---|---|---|
| 1 | activebackground |
Background color when the widget has focus. |
| 2 | bg |
Background color of the widget. |
| 3 | bd |
Border size (default is 2 pixels). |
| 4 | command |
Function called whenever the slider moves. |
| 5 | cursor |
Changes the cursor type (e.g., arrow, dot). |
| 6 | digits |
Specifies the number of digits for string conversion. |
| 7 | font |
Defines the font of the widget text. |
| 8 | fg |
Foreground color of the text. |
| 9 | from_ |
Defines the starting value of the scale. |
| 10 | highlightbackground |
Highlight color when the widget is unfocused. |
| 11 | highlightcolor |
Highlight color when the widget has focus. |
| 12 | label |
Displays text as a label with the scale. |
| 13 | length |
Specifies the length of the scale. |
| 14 | orient |
Sets the orientation (HORIZONTAL or VERTICAL). |
| 15 | relief |
Defines the border type (default is FLAT). |
| 16 | repeatdelay |
Delay before the slider starts moving repeatedly (default is 300ms). |
| 17 | resolution |
Defines the smallest possible change in value. |
| 18 | showvalue |
Displays the selected value (set to 0 to hide). |
| 19 | sliderlength |
Length of the slider (default is 30 pixels). |
| 20 | state |
Sets the state (ACTIVE or DISABLED). |
| 21 | takefocus |
Allows focus cycling (set to 0 to disable). |
| 22 | tickinterval |
Displays tick marks at specified intervals. |
| 23 | to |
Defines the end value of the scale. |
| 24 | troughcolor |
Sets the color of the slider’s trough. |
| 25 | variable |
Associates a variable with the scale. |
| 26 | width |
Defines the width of the trough. |
Tkinter Scale Widget Methods
| SN | Method | Description |
|---|---|---|
| 1 | get() |
Retrieves the current value of the scale. |
| 2 | set(value) |
Sets the scale value programmatically. |
Example: Implementing a Scale Widget in Tkinter
from tkinter import *
def select():
sel = "Value = " + str(v.get())
label.config(text=sel)
top = Tk()
top.geometry("200x100")
v = DoubleVar()
scale = Scale(top, variable=v, from_=1, to=50, orient=HORIZONTAL)
scale.pack(anchor=CENTER)
btn = Button(top, text="Get Value", command=select)
btn.pack(anchor=CENTER)
label = Label(top)
label.pack()
top.mainloop()
Output:
The program creates a Tkinter window with a horizontal slider ranging from 1 to . When the user moves the slider and clicks the “Get Value” button, the selected value is displayed below.
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Conclusion
The Tkinter Scale widget is an essential tool for adding interactive sliders to Python applications. It provides an intuitive way for users to select numerical values and is highly customizable. With various configuration options and event handling capabilities, it is a versatile component for GUI development.
By integrating the Scale widget in your Tkinter applications, you can enhance user interaction and provide a smooth experience.
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