MediaLayerView | API Reference | ArcGIS Maps SDK for JavaScript 4.30

Represents the LayerView of a MediaLayer after it has been added to a Map in a MapView or SceneView.

Keyboard shortcuts

Various keyboard shortcuts are available when enabling interactive manipulation of media elements in the layer view.

Shortcut	Action
Z	Incrementally undo actions recorded in the stack. The undo/redo stack is for an individual operation, meaning you can redo/undo actions while updating a single element.
R	Incrementally redo actions recorded in the stack. The undo/redo stack is for an individual operation, meaning you can redo/undo actions while updating a single element.
Shift (resize)	Enable uniform scaling when resizing an element.
Shift (rotate)	Enable rotation with 5 degree increments.
Shift+Arrow	Move an element by a single pixel.
Shift+Primary+Arrow	Move an element by 10 pixels. The primary key is the Cmd key on macos or Ctrl on other OS.
T	Toggle transparency of the element.

See also

MediaLayer

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.

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Type	Summary	Class
String	The name of the class.	Accessor
Accessor	Options for when the layer view is interactive.	MediaLayerView
Boolean	Set to `true` to enable interactivity for the layer.	MediaLayerView
MediaLayer	The layer being viewed.	MediaLayerView
ImageElement\|VideoElement	The selected element.	MediaLayerView
Boolean	Value is `true` if the layer is suspended (i.e., layer will not redraw or update itself when the extent changes).	MediaLayerView
Boolean	Indicates if the layer view is making any updates that will impact what is displayed on the map.	LayerView
MapView\|SceneView	A reference to the MapView or SceneView associated with the layer view.	LayerView
Boolean	When `true`, the layer is visible in the view.	LayerView
Boolean	When `true`, the layer is visible in the view at the current scale.	LayerView
Boolean	When `true`, the layer is visible in the view's timeExtent.	LayerView

Property Details

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

The name of the class. The declared class name is formatted as esri.folder.className.

interactionOptions Property interactionOptions Accessor

Options for when the layer view is interactive.

Known Limitations

Interactivity is not supported in 2D MapViews

Property

tool String

optional

The type of tool to use to interact with media elements.

Value	Description
transform	The media element can be moved, scaled and rotated as a whole (default).
reshape	The four corners of the media element can be moved individually.

Possible Values:"transform"|"reshape"

See also

interactive

interactive Property interactive Boolean

Set to true to enable interactivity for the layer. Any elements in the layer's source become selectable and editable.

Known Limitations

Interactivity is not supported in 2D MapViews

Default Value:false

See also

selectedElement
interactionOptions

Example

view.whenLayerView(mediaLayer).then((mediaLayerView) => {
  // Enable interactivity and select first element
  mediaLayerView.interactive = true;

  mediaLayerView.selectedElement = mediaLayer.source.elements.at(0);
});

layer Property layer MediaLayerreadonly

The layer being viewed.

selectedElement Property selectedElement ImageElement |VideoElement

The selected element. If interactive is true, any element in the layer can be selected by clicking on it in the view. As long as interactive remains true, the properties of the selected element can be edited by interacting with manipulators in the view.

Known Limitations

Interactivity is not supported in 2D MapViews

See also

interactive

Example

view.whenLayerView(mediaLayer).then((mediaLayerView) => {
  // Enable interactivity and select first element
  mediaLayerView.interactive = true;

  mediaLayerView.selectedElement = mediaLayer.source.elements.at(0);
});

suspended Property suspended Booleanreadonly

Value is true if the layer is suspended (i.e., layer will not redraw or update itself when the extent changes).

updating Inherited Property updating Booleanreadonly Inherited from LayerView

Indicates if the layer view is making any updates that will impact what is displayed on the map. For example, this value is true when renderer, definitionExpression, filter or effect is changed or if the layer view is in the process of the fetching data.

Watch dataUpdating property instead to only know when the data has been updated (e.g. to run statistics query on all feature available in the layer view).

Default Value:false

Example

// Check for the first time layerView.updating becomes false. Then query for
// features that are visible within the view associated with the layer view.
await reactiveUtils.whenOnce(() => !layerView.updating);
const query = layerView.createQuery();
query.geometry = layerView.view.extent;
const result = layerView.queryFeatures(query);

view Inherited Property view MapView |SceneViewreadonly Inherited from LayerView

A reference to the MapView or SceneView associated with the layer view.

Example

// Check for the first time layerView.updating becomes false. Then query for
// features that are visible within the view associated with the layer view.
await reactiveUtils.whenOnce(() => !layerView.updating);
const query = layerView.createQuery();
query.geometry = layerView.view.extent;
const result = layerView.queryFeatures(query);

visible Inherited Property visible Boolean Inherited from LayerView

When true, the layer is visible in the view. Value of this property is inherited from the layer.visible unless the developer overrides it. The layerView.visible will take precedence over layer.visible if both properties are set.

Default Value:true

visibleAtCurrentScale Inherited Property visibleAtCurrentScale Booleanreadonly Inherited from LayerView

When true, the layer is visible in the view at the current scale. This applies to layers that have minScale and maxScale properties set.

Known Limitations

This property is not supported in 3D SceneView tiled layers.

Default Value:true

See also

visibleAtCurrentTimeExtent
suspended

visibleAtCurrentTimeExtent Inherited Property visibleAtCurrentTimeExtent Booleanreadonly Inherited from LayerView

When true, the layer is visible in the view's timeExtent. This applies to layers that have a visibilityTimeExtent.

Default Value:true

See also

visibleAtCurrentScale
suspended

Method Overview

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Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
Boolean	Returns true if a named group of handles exist.	Accessor
Boolean	`isFulfilled()` may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).	LayerView
Boolean	`isRejected()` may be used to verify if creating an instance of the class is rejected.	LayerView
Boolean	`isResolved()` may be used to verify if creating an instance of the class is resolved.	LayerView
	Removes a group of handles owned by the object.	Accessor
Promise	`when()` may be leveraged once an instance of the class is created.	LayerView

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

Parameters

handleOrHandles WatchHandle|WatchHandle []

Handles marked for removal once the object is destroyed.

groupKey *

optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

hasHandles Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor

Returns true if a named group of handles exist.

Parameter

groupKey *

optional

A group key.

Returns

Type	Description
Boolean	Returns `true` if a named group of handles exist.

Example

// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

isFulfilled Inherited Method isFulfilled(){Boolean} Inherited from LayerView

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected). If it is fulfilled, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been fulfilled (either resolved or rejected).

isRejected Inherited Method isRejected(){Boolean} Inherited from LayerView

isRejected() may be used to verify if creating an instance of the class is rejected. If it is rejected, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been rejected.

isResolved Inherited Method isResolved(){Boolean} Inherited from LayerView

isResolved() may be used to verify if creating an instance of the class is resolved. If it is resolved, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been resolved.

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor

Removes a group of handles owned by the object.

Parameter

groupKey *

optional

A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

when Inherited Method when(callback, errback){Promise} Inherited from LayerView

when() may be leveraged once an instance of the class is created. This method takes two input parameters: a callback function and an errback function. The callback executes when the instance of the class loads. The errback executes if the instance of the class fails to load.

Parameters

callback Function

optional

The function to call when the promise resolves.

errback Function

optional

The function to execute when the promise fails.

Returns

Type	Description
Promise	Returns a new promise for the result of `callback` that may be used to chain additional functions.

Example

// Although this example uses MapView, any class instance that is a promise may use when() in the same way
let view = new MapView();
view.when(function(){
  // This function will execute once the promise is resolved
}, function(error){
  // This function will execute if the promise is rejected due to an error
});