How to Make TextBubbleBorder Corners Transparent Outside the Rectangle?

Text Bubble Border Transparent Outside Rectangle

The "TextBubbleBorder" class allows users to create rounded rectangle borders around components with customizable thickness, radii, and pointer size. Recently, it has been requested that the corners of the border outside the rectangle be made transparent to display underlying components.

The Problem

Initially, an approach was attempted to clear the background color of a label outside the border by using a clip and calling "clearRect()". While this approach restricts the background color within the border, it doesn't fully solve the problem in cases where there's a non-standard color in the parent container.

The Solution

To address this issue, the accepted solution involves painting the parent component's background color everywhere outside the text bubble's clip. This is accomplished using the following steps:

1. Get the parent component of the component with the border.
2. Create an "Area" representing the border region by subtracting the text bubble's area from a rectangle representing the entire component's area.
3. Use this border region as a clip to paint the parent's background color.

By following this approach, the corners outside the rectangle become transparent, allowing the underlying components to be visible. The sample code provided updates the "TextBubbleBorder" class to incorporate this solution.

Note:

It's important to highlight that there is a clipping bug in the code you provided, which is resolved in the accepted answer to another related question. This update should be incorporated alongside the transparency solution for optimal results.

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