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# FxOnScreenControlAPI_v4

The `FxOnScreenControlAPI_v4` protocol specifies additions to the [`FxOnScreenControlAPI`](/documentation/professional_video_applications/FxOnScreenControlAPI) protocol which defines the methods the host application provides to manage conversions between various on-screen coordinate spaces.

```
protocol FxOnScreenControlAPI_v4 : FxOnScreenControlAPI_v3
```

## Overview

This protocol inherits from, and expands on, the `FxOnScreenControlAPI_v3` protocol. It allows an FxPlug plug-in to set the cursor the users sees in the canvas.

## Topics

### Setting Canvas Cursor

[`setCursor(_:)`](/documentation/professional_video_applications/FxOnScreenControlAPI_v4/setCursor(_:))

Sets the cursor the user sees in the canvas.


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