Table of contents
1.
Introduction
2.
Procedure to create a slider
3.
Example
4.
Frequently Asked Questions
4.1.
What is Slider widget in Kivy?
4.2.
What is a Widget in Kivy?
4.3.
What is Builder in kivy?
4.4.
How does a slider work?
4.5.
What is an Image slider?
4.6.
How do I use the slider widget in WordPress?
5.
Conclusion
Last Updated: Mar 27, 2024
Easy

Slider Widget using .kv file

Author yuvatimankar
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Introduction

Kivy is a GUI tool that is platform-independent in Python. Kivy can be run on android, IOS, Linux, windows, etc. It is used to create the Android application, but this does not mean that we cannot use it on desktop applications. It also provides a slider widget for app development.

A slider is a widget used for selecting and setting a range of values from minimum values to maximum values. A slider can be placed either in a horizontal or vertical orientation. In the slider, the Normalized value means the minimum value is 0, and the maximum value is 1.

Procedure to create a slider

  • import slider
  • import kivy
  • import kivy app
  • import numeric property
  • Extend the class
  • Set minimum version
  • Import gridlayout(if needed)
  • Import label(if needed)
  • Run an instance of the class
  • Import numeric property

Example

Code 1: 

In this example, we will create a slider widget using the main file and the .kv file. This example will result in a progress bar with its slider value.

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.slider import Slider
from kivy.uix.label import Label
from kivy.properties  import NumericProperty

class WidgetContainer(GridLayout):
def __init__(self, **kwargs):

        super(WidgetContainer, self).__init__(**kwargs)

        # 2 columns in a grid layout
        self.cols = 2
        self.brightnessControl = Slider(min=0, max =100)

        # 1st row - one label, one slider 
           
        self.add_widget(Label(text='brightness'))
        self.add_widget(self.brightnessControl)

        # 2nd row - one label for caption, one label for slider value
        
        self.add_widget(Label(text='Slider Value'))
        self.brightnessValue = Label(text='0')
        self.add_widget(self.brightnessValue)

        # On the slider object Attach a callback for the attribute named value

        self.brightnessControl.bind(value=self.on_value)
        def on_value(self, instance, brightness):
        self.brightnessValue.text = "%d"%brightness

# The app class

        class SliderExample(App):
        def build(self):
        widgetContainer = WidgetContainer()
        return widgetContainer

# Run the app       

if __name__ == '__main__':
     SliderExample().run()
You can also try this code with Online Python Compiler
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Output:

Source: pythontic

 

Code 2:

In this example, we will create a slider that will show its value. Below is the main python file in which a class extends from GridLayout; in Gridlayout, we have added two widgets labels and a slider.

from kivy.app import App
from kivy.uix.gridlayout import GridLayout

class MyLayout(GridLayout):
    pass

class SliderWindow(App):
    def build(self):
      
      return MyLayout()

if __name__ == "__main__":
    window = SliderWindow()
    window.run()
You can also try this code with Online Python Compiler
Run Code

 

Below code is a kv file; remember the file name should be the same as the main class name. Here, the filename is sliderwindow.kv.

<MyLayout>
    mylabel:label
    cols:2
    Slider:
        min:0
        max:100
        on_value:label.text = str(int(self.value))
    Label:
        id:label
        text:"0"
You can also try this code with Online Python Compiler
Run Code

 

Output:


 Source: codeloop

Frequently Asked Questions

What is Slider widget in Kivy?

A slider widget looks like a scrollbar; it supports min/max values, horizontal and vertical orientation, and default values.

What is a Widget in Kivy?

A widget is a fundamental building block of the GUI interface in kivy. It receives events and reacts to them.

What is Builder in kivy?

It is a global instance used in widgets that you can use to load other kv files and the default.

How does a slider work?

A slider widget is a design that is used to present images and videos on your website. Slider works as a slideshow, showing one image or video at a time.

What is an Image slider?

A slider is a slideshow of images, videos, or texts that may automatically scroll and allow the visitors to scroll through them.

How do I use the slider widget in WordPress?

1. Activate the smart slider 3 plugin through the ‘plugins’ menu in WordPress. 

2. Create a new slider: click on the slider menu and then you can add videos and images as slides and you can customize your slides with layers.

Conclusion

In this article, we have extensively discussed the slider widget using the .kv file. We started with a brief introduction to kivy, and widgets in kivy, then slider widgets using .kv  with the help of examples. 

After reading about this topic, are you not feeling excited to read/explore more articles on the topics of kivy python? Don’t worry, Coding ninjas has you covered. To learn more on such topics, you can visit StackLayout in Kivy using .kv file, FloatLayout in Kivy using .kv file, BoxLayout Widget in Kivy, The drop-down List In Kivy, and Background template in Kivy!

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