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# CGEventTapOptions

Constants that specify whether a new event tap is an active filter or a passive listener.

```
enum CGEventTapOptions
```

## Overview

When you create an event tap, you indicate whether it is a passive listener or active event filter. A passive listener receives events but cannot modify or divert them. An active filter may pass an event through unmodified, modify an event, or discard an event.

## Topics

### Constants

[`CGEventTapOptions.defaultTap`](/documentation/CoreGraphics/CGEventTapOptions/defaultTap)

[`CGEventTapOptions.listenOnly`](/documentation/CoreGraphics/CGEventTapOptions/listenOnly)


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