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# CGEventTapPlacement

Constants that specify where a new event tap is inserted into the list of active event taps.

```
enum CGEventTapPlacement
```

## Overview

Event taps may be inserted at a specified location at the head of pre-existing filters, or appended after any pre-existing filters.

## Topics

### Constants

[`CGEventTapPlacement.headInsertEventTap`](/documentation/CoreGraphics/CGEventTapPlacement/headInsertEventTap)

Specifies that a new event tap should be inserted before any pre-existing event taps at the same location.

[`CGEventTapPlacement.tailAppendEventTap`](/documentation/CoreGraphics/CGEventTapPlacement/tailAppendEventTap)

Specifies that a new event tap should be inserted after any pre-existing event taps at the same location.


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