How to Achieve Transparent Rounded Corners in TextBubbleBorder?

Border with Rounded Corners and Transparency

Question

The original TextBubbleBorder component featured rounded corners with no transparency, resulting in portions of the component lying outside the rectangle displaying the default panel color. The goal is to make those corners transparent, allowing the colors of components beneath to show through.

Solution

To achieve transparent rounded corners, a clipping process is employed. Here's how it works:

1. An Area is created to define the shape of the rounded rectangle and the speech pointer (if present).
2. The setClip method is used to restrict drawing operations to the specified Area. This means drawing will only occur within the bubble's defined shape.
3. The background color of the parent component is painted everywhere outside the clip, covering any previously drawn graphics outside the bubble.
4. The clip is removed, and the bubble's border is drawn over the filled background, resulting in transparent corners.

By integrating this clipping technique, the TextBubbleBorder component can now display transparent rounded corners, allowing the colors of underlying components to remain visible. Note that a clipping bug in the original code needs to be fixed before this solution can work correctly. The corrected code can be found in the accepted answer to the question "paintComponent() is drawing on other components."

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