---
title: DragDropPreviewsFormation
framework: swiftui
role: symbol
role_heading: Structure
path: swiftui/dragdroppreviewsformation
---

# DragDropPreviewsFormation

On macOS, describes the way the dragged previews are visually composed. Both drag sources and drop destination can specify their desired preview formation.

## Declaration

```swift
struct DragDropPreviewsFormation
```

## Topics

### Type Properties

- [default](swiftui/dragdroppreviewsformation/default.md)
- [list](swiftui/dragdroppreviewsformation/list.md)
- [none](swiftui/dragdroppreviewsformation/none.md)
- [pile](swiftui/dragdroppreviewsformation/pile.md)
- [stack](swiftui/dragdroppreviewsformation/stack.md)

## Relationships

### Conforms To

- [Copyable](swift/copyable.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Escapable](swift/escapable.md)
- [Hashable](swift/hashable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Describing preview formations

- [dragPreviewsFormation(_:)](swiftui/view/dragpreviewsformation(_:).md)
- [dropPreviewsFormation(_:)](swiftui/view/droppreviewsformation(_:).md)