Kivy Builder & Changing Window Colour

Python Kivy is a powerful open-source Python library for developing multi-touch applications. In this tutorial, we will explore the Kivy Builder and how to change the window color to create modern GUIs and apps with Python Kivy. This is tutorial #6 in our series on Python Kivy.

Kivy Builder

Kivy Builder is a powerful tool for creating user interfaces in Kivy. It allows you to create complex layouts and widgets by defining them in a KV language file, which separates the design from the logic of the application. This makes it easier to maintain and modify the UI design without touching the code.

To use the Kivy Builder, you need to create a .kv file with the same name as your app’s main class, and then define the UI layout and widgets using a simple and intuitive syntax. For example, you can define a Button widget like this:

	:
    	text: 'Click Me'
	

Changing Window Colour

Changing the window color in a Kivy application is a simple and effective way to customize the look and feel of your app. You can easily change the window color by setting the background color property in the kv file or by using the Window class from the kivy.core.window module.

To set the window color in the kv file, you can use the following syntax:

	Window:
	    canvas.before:
	        Color:
	            rgba: 1, 0, 0, 1  # Red color
	        Rectangle:
	            pos: self.pos
	            size: self.size
	

If you prefer to set the window color in the Python code, you can use the Window class to set the background color like this:

	from kivy.core.window import Window

	Window.clearcolor = (1, 0, 0, 1)  # Red color
	

Conclusion

In this tutorial, we have learned about the Kivy Builder and how to change the window color to create modern GUIs and apps with Python Kivy. The Kivy Builder allows you to easily define complex layouts and widgets in a separate KV file, while changing the window color allows you to customize the look and feel of your app. We hope this tutorial has been helpful in understanding how to create modern GUIs and apps with Python Kivy.