# HighlightStyle Enum

> Specifies the visual effect used when a link annotation is activated (clicked).

- Product: Adobe PDF Library 21
- Language: Modern C++
- Version: 21.4.0
- HTML page: https://docs.datalogics.com/apdfl21/ModernCPP/21.4.0/enum/HighlightStyle
- Version index: https://docs.datalogics.com/apdfl21/ModernCPP/21.4.0/llms.txt

**Namespace:** `datalogics_interface`

## Description

Specifies the visual effect used when a link annotation is activated (clicked).

## Values

- `None = 0`: No visual highlight when activated.
- `Invert = 1`: Invert the colors inside the link's annotation rectangle.
- `Outline = 2`: Invert the annotation's border.
- `Push = 3`: Display the annotation as if it were being pushed below its rectangle.