Class DropZone

A drop zone is a container that can be used to drop content into.

Inheritance
object
CallbackEventHandler
Focusable
VisualElement
BaseVisualElement
DropZone
Implements
Inherited Members
VisualElement.ExecuteDefaultAction(EventBase)
VisualElement.Focus()
VisualElement.Overlaps(Rect)
VisualElement.ToString()
VisualElement.GetFirstOfType<T>()
VisualElement.GetFirstAncestorOfType<T>()
VisualElement.canGrabFocus
VisualElement.focusController
VisualElement.cacheAsBitmap
CallbackEventHandler.RegisterCallback<TEventType>(EventCallback<TEventType>, TrickleDown)
CallbackEventHandler.RegisterCallback<TEventType, TUserArgsType>(EventCallback<TEventType, TUserArgsType>, TUserArgsType, TrickleDown)
CallbackEventHandler.UnregisterCallback<TEventType>(EventCallback<TEventType>, TrickleDown)
CallbackEventHandler.UnregisterCallback<TEventType, TUserArgsType>(EventCallback<TEventType, TUserArgsType>, TrickleDown)
Namespace: Unity.AppUI.UI
Assembly: Unity.AppUI.dll
Syntax
public class DropZone : BaseVisualElement, IEventHandler, ITransform, ITransitionAnimations, IExperimentalFeatures, IVisualElementScheduler, IResolvedStyle, IContextOverrideElement

Constructors

DropZone()

Create a new DropZone.

Declaration
public DropZone()

DropZone(Action)

Create a new DropZone.

Declaration
public DropZone(Action onClick)
Parameters
Type Name Description
Action onClick

The action to perform when the DropZone is clicked.

Fields

backgroundUssClassName

The DropZone background styling class.

Declaration
public static readonly string backgroundUssClassName
Field Value
Type Description
string

frameUssClassName

The DropZone frame styling class.

Declaration
public static readonly string frameUssClassName
Field Value
Type Description
string

stateUssClassName

The DropZone state styling class.

Declaration
public static readonly string stateUssClassName
Field Value
Type Description
string

ussClassName

The DropZone main styling class.

Declaration
public static readonly string ussClassName
Field Value
Type Description
string

visibleIndicatorUssClassName

The DropZone visible indicator styling class.

Declaration
public static readonly string visibleIndicatorUssClassName
Field Value
Type Description
string

Properties

clickable

The Pressable used to handle click events.

Declaration
public Pressable clickable { get; }
Property Value
Type Description
Pressable

contentContainer

The container used to display the content.

Declaration
public override VisualElement contentContainer { get; }
Property Value
Type Description
VisualElement
Overrides

state

The state of the DropZone.

Declaration
public DropZoneState state { get; set; }
Property Value
Type Description
DropZoneState

tryGetDroppableFromPath

Method invoked when a drag is started to find any droppable object(s) that can be dropped on the target using the current drag and drop path data.

See paths for more information.

Declaration
public DropZone.TryGetDroppableFromPathHandler tryGetDroppableFromPath { get; set; }
Property Value
Type Description
DropZone.TryGetDroppableFromPathHandler
Remarks

This method will only be called in the Unity Editor, since it relies on the paths property which is not available in Unity Runtime.

tryGetDroppables

Method invoked when a drag is started to find any droppable object(s) that can be dropped on the target.

Declaration
public DropZone.TryGetDroppablesHandler tryGetDroppables { get; set; }
Property Value
Type Description
DropZone.TryGetDroppablesHandler
Remarks

This method will be called in both the Unity Editor and Unity Runtime.

tryGetDroppablesFromUnityObjects

Method invoked when a drag is started to find any droppable object(s) that can be dropped on the target using the current drag and drop objects data.

See objectReferences for more information.

Declaration
public DropZone.TryGetDroppablesFromUnityObjectsHandler tryGetDroppablesFromUnityObjects { get; set; }
Property Value
Type Description
DropZone.TryGetDroppablesFromUnityObjectsHandler
Remarks

This method will only be called in the Unity Editor, since it relies on the objectReferences property which is not available in Unity Runtime.

visibleIndicator

The visible indicator state of the DropZone.

Declaration
public bool visibleIndicator { get; set; }
Property Value
Type Description
bool

Events

dragEnded

Event fired when the user stops dragging droppable object(s).

Use this event to perform any cleanup after a drag and drop operation.

Declaration
public event Action dragEnded
Event Type
Type Description
Action

dragStarted

Event fired when the user starts dragging droppable object(s).

Use this event to perform validate the drag and drop operation via the state property.

Declaration
public event Action dragStarted
Event Type
Type Description
Action

dropped

Event fired when the user drops droppable object(s) on the target.

Declaration
public event Action<IEnumerable<object>> dropped
Event Type
Type Description
Action<IEnumerable<object>>

Implements

Extension Methods