---
title: CGWindowLevel
framework: coregraphics
role: symbol
role_heading: Type Alias
path: coregraphics/cgwindowlevel
---

# CGWindowLevel

A level assigned to a window by an application framework.

## Declaration

```swift
typealias CGWindowLevel = Int32
```

## Discussion

Discussion In macOS, application frameworks support the concept of multiple window levels (or layers). Window levels are assigned and managed by each individual framework. Note that in an Aqua-compliant application, each document window exists in its own layer. As a result, windows created by different applications can be interleaved.

## Topics

### Window levels

- [CGWindowLevelKey](coregraphics/cgwindowlevelkey.md)

## See Also

### Data Types

- [CGButtonCount](coregraphics/cgbuttoncount.md)
- [CGCharCode](coregraphics/cgcharcode.md)
- [CGDirectDisplayID](coregraphics/cgdirectdisplayid.md)
- [CGDisplayBlendFraction](coregraphics/cgdisplayblendfraction.md)
- [CGDisplayConfigRef](coregraphics/cgdisplayconfigref.md)
- [CGDisplayCount](coregraphics/cgdisplaycount.md)
- [CGDisplayErr](coregraphics/cgdisplayerr.md)
- [CGDisplayFadeInterval](coregraphics/cgdisplayfadeinterval.md)
- [CGDisplayFadeReservationToken](coregraphics/cgdisplayfadereservationtoken.md)
- [CGDisplayMode](coregraphics/cgdisplaymode.md)
- [CGDisplayReconfigurationCallBack](coregraphics/cgdisplayreconfigurationcallback.md)
- [CGDisplayReservationInterval](coregraphics/cgdisplayreservationinterval.md)
- [CGDisplayStream](coregraphics/cgdisplaystream.md)
- [CGDisplayStreamFrameAvailableHandler](coregraphics/cgdisplaystreamframeavailablehandler.md)
- [CGDisplayStreamUpdate](coregraphics/cgdisplaystreamupdate.md)