Add Image Button using .kv file.
To use the button, you must import the following library:
import kivy.uix.button as Button
Steps of adding Image Button
- Import Kivy
- Import KivyApp
- Import FloatLayout
- Import Button
- Determine the bare minimum version (optional)
- Make a class called Layout.
- Make a class for your app.
-
Make a.kv file
Add the Base class first.
Add attributes to the button
Create a button with an image.
Imagebutton resizing, positioning, and other functions
- Get a layout class instance.
- Execute a class instance.
Implementation of the above Approach:
Main.py file
# import kivy module
import kivy
from kivthey.app import App
from kivy.uix.floatlayout import FloatLayout
# creates the button in kivy
# if not imported shows the error
from kivy.uix.button import Button
kivy.require('1.9.0')
from kivy.config import Config
# As in true / false, 0 means off and 1 is on.
# You can use either 0 or 1 as well as True or False.
Config.set('graphics', 'resizable', True)
# creating the root widget used in .kv file
class Base(FloatLayout):
# Adding functionality and arranging a callback to a button
def __init__(self, **kwargs):
super(Base, self).__init__(**kwargs)
def say_hello(self):
print("hello")
# class in which we are creating the image button
# in .kv file to be named Btn.kv
class BtnApp(App):
# defining build()
def build(self):
# returning the instance of root class
return Base()
# run function runs the whole program
# i.e run() method which calls the target
# function passed to the constructor.
if __name__ == "__main__":
BtnApp().run()
.kv file
#.kv file implementation of setting position, size and functionality of btn
# create a fully styled functional button
# Adding images normal.png and down.png
<Base>:
Button:
background_normal: 'normal.png'
background_down: 'down.png'
size_hint: .3, .3
pos_hint: {"x":0.35, "y":0.3}
on_press: root.say_hello()
Output
When the button is not pressed
When the button is pressed.
Image Widget
An image is shown with the Image widget. To use the picture widget, you must import the following:
import Image, AsyncImage from kivy.uix.image (not necessary while working with .kv file)
Because the module kivy.uix.image contains all image-related functionality.
There are two methods for loading images into the app:
- Synchronous Picture Loading: Obtaining an image first from the system (must be from the folder in which .py and .kv file is saved)
- Asynchronous Image Loading: Asynchronous image loading (for example from an external webserver)
Note: The image is centred and fits within the widget bounding box by default. The set allows the stretch to True and keeps the ratio to False if you don't want that.
Frequently Asked Questions
How do I open a .kv file?
Kivy is a free app that can open KV files and is available for Windows, macOS, Linux, Android, and iOS. JetBrains PyCharm (multiplatform), a Python IDE, and Microsoft Visual Studio Code (multiplatform), a source code editor, may both be used to edit KV files.
What does an Image Button do?
The ImageButton view manages to combine the Button and Image views to provide a button with an image as its content. To tell the application to perform a certain operation, the user touches the ImageButton with a finger or clicks it with a mouse. The ImageButton view, unlike the Button view, has no idea of a text or text appearance.
How do I open images on Kivy?
Basically, in kivy, set the source attribute under "Image" to the name of your image file (file). Once you've selected a clock schedule as described above, you can make changes to your photo. By changing the clock scheduler to Clock, you can even add some photo looping (dynamically).
Conclusion
In this blog, we have extensively discussed the Image Button using the .kv file. We hope that this article has provided you with additional information about the kivy and Image Button using the .kv file. So In this article, we will learn how can we use the images as the button using the .kv file functionality and also give some styling to the button. And to learn in-depth about Kivy functions, check out the course on our Kivy on the Coding Ninjas website. And also, check out the awesome content on the Coding Ninjas Website, Android Development, Coding Ninjas Studio Problems, Coding Ninjas Studio Interview Bundle, Coding Ninjas Studio Interview Experiences, Coding Ninjas Courses, Coding Ninjas Studio Contests, and Coding Ninjas Studio Test Series. Do upvote our blog in helping other ninjas grow.
Happy Programming!
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