Скачать или смотреть How to Add a White Border After Background Color in Kivy Using Pure Python

Discover how to add a stylish white border around your Kivy BoxLayout with an eye-catching background color using pure Python code. This guide breaks down the steps for you.
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This video is based on the question https://stackoverflow.com/q/77992967/ asked by the user 'MECRA YAVCIN' ( https://stackoverflow.com/u/22437609/ ) and on the answer https://stackoverflow.com/a/77993185/ provided by the user 'Kenechukwu Akubue' ( https://stackoverflow.com/u/11581510/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Add a White Border After Background Color in Kivy Using Pure Python

Kivy is an excellent framework for building user interfaces in Python, allowing developers to create vibrant applications with ease. One common design request is to add a colored background to a layout which ideally should also have a distinct border. In this article, we’ll explore how you can achieve this effect, specifically adding a white border around a BoxLayout with a colored background.

The Problem

You have a Kivy BoxLayout and you want it to have a blue background along with a white border. An initial attempt through the Kivy graphics instructions didn’t yield the desired result, as the border was not visible. Let’s look at the provided base code that was used and understand the mistake:

[[See Video to Reveal this Text or Code Snippet]]

In this code, while the blue background is correctly displayed, the white border portion is missing or not working as intended.

The Solution

To add a white border effectively, we need to revise how we manage the canvas in Kivy. The white border can be drawn after the background using the canvas.after context. Below is the corrected and fully functional code that accomplishes this:

[[See Video to Reveal this Text or Code Snippet]]

Key Code Elements Explained

Canvas Management:

We utilize box.canvas to draw both the background and the border sequentially.

The Background Color is set first, followed by the Border.

Drawing the Border:

The Line() function is used to draw the edges of the BoxLayout. The rectangle argument indicates the dimensions of the area covered by the border.

Customizing Appearance:

Inside the Color() functions, you can adjust RGBA values to change colors as per your design needs.

Conclusion

Incorporating a white border around your BoxLayout in Kivy allows for visually appealing designs in your applications. Hopefully, this guide simplified the process and resolved the initial problems encountered. Now, you can easily enhance your UI by adding aesthetic elements like borders and colored backgrounds.

If you run into any other issues, feel free to reach out or consult the Kivy documentation for more advanced options!