DragDropExperimental (clipboard)

@ckeditor/ckeditor5-clipboard/src/dragdropexperimental

Properties

• readonly inherited

  editor : Editormodule:clipboard/dragdropexperimental~DragDropExperimental#editor

  See source

  The editor instance.

  Note that most editors implement the ui property. However, editors with an external UI (i.e. Bootstrap-based) or a headless editor may not have this property or throw an error when accessing it.

  Because of above, to make plugins more universal, it is recommended to split features into:

  • The "editing" part that uses the Editor class without ui property.
  • The "UI" part that uses the Editor class and accesses ui property.

• inherited observable

  isEnabled : booleanmodule:clipboard/dragdropexperimental~DragDropExperimental#isEnabled

  See source

  Flag indicating whether a plugin is enabled or disabled. A disabled plugin will not transform text.

  Plugin can be simply disabled like that:

  // Disable the plugin so that no toolbars are visible.
  editor.plugins.get( 'TextTransformation' ).isEnabled = false;
  

  You can also use forceDisabled method.

• private

  _blockMode : booleanmodule:clipboard/dragdropexperimental~DragDropExperimental#_blockMode

  See source

  Whether the dragged content can be dropped only in block context.

• private

  _clearDraggableAttributesDelayed : DelayedFunc<() => void>module:clipboard/dragdropexperimental~DragDropExperimental#_clearDraggableAttributesDelayed

  See source

  A delayed callback removing draggable attributes.

• private

  _domEmitter : DomEmittermodule:clipboard/dragdropexperimental~DragDropExperimental#_domEmitter

  See source

  DOM Emitter.

• private

  _draggableElement : null | Elementmodule:clipboard/dragdropexperimental~DragDropExperimental#_draggableElement

  See source

  The reference to the model element that currently has a draggable attribute set (it is set while dragging).

• private

  _draggedRange : null | LiveRangemodule:clipboard/dragdropexperimental~DragDropExperimental#_draggedRange

  See source

  The live range over the original content that is being dragged.

• private

  _draggingUid : stringmodule:clipboard/dragdropexperimental~DragDropExperimental#_draggingUid

  See source

  The UID of current dragging that is used to verify if the drop started in the same editor as the drag start.

  Note: This is a workaround for broken 'dragend' events (they are not fired if the source text node got removed).

• private

  _previewContainer : HTMLElement | undefinedmodule:clipboard/dragdropexperimental~DragDropExperimental#_previewContainer

  See source

  The DOM element used to generate dragged preview image.

Static properties

• readonly inherited static

  isContextPlugin : falsemodule:clipboard/dragdropexperimental~DragDropExperimental.isContextPlugin

  See source

• readonly static

  pluginName : 'DragDropExperimental'module:clipboard/dragdropexperimental~DragDropExperimental.pluginName

  See source

• readonly static

  requires : readonly tuplemodule:clipboard/dragdropexperimental~DragDropExperimental.requires

  See source

Methods

• inherited

  constructor( editor )module:clipboard/dragdropexperimental~DragDropExperimental#constructor

  See source

  Parameters

  editor : Editor

• inherited

  bind( bindProperty1, bindProperty2 ) → DualBindChain<K1, DragDropExperimental[ K1 ], K2, DragDropExperimental[ K2 ]>module:clipboard/dragdropexperimental~DragDropExperimental#bind:DUAL_BIND

  See source

  Binds observable properties to other objects implementing the Observable interface.

  Read more in the dedicated guide covering the topic of property bindings with some additional examples.

  Consider two objects: a button and an associated command (both Observable).

  A simple property binding could be as follows:

  button.bind( 'isEnabled' ).to( command, 'isEnabled' );
  

  or even shorter:

  button.bind( 'isEnabled' ).to( command );
  

  which works in the following way:

  • button.isEnabled instantly equals command.isEnabled,
  • whenever command.isEnabled changes, button.isEnabled will immediately reflect its value.

  Note: To release the binding, use unbind.

  You can also "rename" the property in the binding by specifying the new name in the to() chain:

  button.bind( 'isEnabled' ).to( command, 'isWorking' );
  

  It is possible to bind more than one property at a time to shorten the code:

  button.bind( 'isEnabled', 'value' ).to( command );
  

  which corresponds to:

  button.bind( 'isEnabled' ).to( command );
  button.bind( 'value' ).to( command );
  

  The binding can include more than one observable, combining multiple data sources in a custom callback:

  button.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',
  	( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );
  

  Using a custom callback allows processing the value before passing it to the target property:

  button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
  

  It is also possible to bind to the same property in an array of observables. To bind a button to multiple commands (also Observables) so that each and every one of them must be enabled for the button to become enabled, use the following code:

  button.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',
  	( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );
  

  Type parameters

  K1

  K2

  Parameters

  bindProperty1 : K1

  Observable property that will be bound to other observable(s).

  bindProperty2 : K2

  Observable property that will be bound to other observable(s).

  Returns

  DualBindChain<K1, DragDropExperimental[ K1 ], K2, DragDropExperimental[ K2 ]>

  The bind chain with the to() and toMany() methods.

• inherited

  bind( bindProperties ) → MultiBindChainmodule:clipboard/dragdropexperimental~DragDropExperimental#bind:MANY_BIND

  See source

  Binds observable properties to other objects implementing the Observable interface.

  Read more in the dedicated guide covering the topic of property bindings with some additional examples.

  Consider two objects: a button and an associated command (both Observable).

  A simple property binding could be as follows:

  button.bind( 'isEnabled' ).to( command, 'isEnabled' );
  

  or even shorter:

  button.bind( 'isEnabled' ).to( command );
  

  which works in the following way:

  • button.isEnabled instantly equals command.isEnabled,
  • whenever command.isEnabled changes, button.isEnabled will immediately reflect its value.

  Note: To release the binding, use unbind.

  You can also "rename" the property in the binding by specifying the new name in the to() chain:

  button.bind( 'isEnabled' ).to( command, 'isWorking' );
  

  It is possible to bind more than one property at a time to shorten the code:

  button.bind( 'isEnabled', 'value' ).to( command );
  

  which corresponds to:

  button.bind( 'isEnabled' ).to( command );
  button.bind( 'value' ).to( command );
  

  The binding can include more than one observable, combining multiple data sources in a custom callback:

  button.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',
  	( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );
  

  Using a custom callback allows processing the value before passing it to the target property:

  button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
  

  It is also possible to bind to the same property in an array of observables. To bind a button to multiple commands (also Observables) so that each and every one of them must be enabled for the button to become enabled, use the following code:

  button.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',
  	( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );
  

  Parameters

  bindProperties : Array<'off' | 'on' | 'once' | 'listenTo' | 'stopListening' | 'fire' | 'delegate' | 'stopDelegating' | 'set' | 'bind' | 'unbind' | 'decorate' | 'destroy' | 'init' | 'isEnabled' | 'editor' | 'forceDisabled' | 'clearForceDisabled'>

  Observable properties that will be bound to other observable(s).

  Returns

  MultiBindChain

  The bind chain with the to() and toMany() methods.

• inherited

  bind( bindProperty ) → SingleBindChain<K, DragDropExperimental[ K ]>module:clipboard/dragdropexperimental~DragDropExperimental#bind:SINGLE_BIND

  See source

  Binds observable properties to other objects implementing the Observable interface.

  Read more in the dedicated guide covering the topic of property bindings with some additional examples.

  Consider two objects: a button and an associated command (both Observable).

  A simple property binding could be as follows:

  button.bind( 'isEnabled' ).to( command, 'isEnabled' );
  

  or even shorter:

  button.bind( 'isEnabled' ).to( command );
  

  which works in the following way:

  • button.isEnabled instantly equals command.isEnabled,
  • whenever command.isEnabled changes, button.isEnabled will immediately reflect its value.

  Note: To release the binding, use unbind.

  You can also "rename" the property in the binding by specifying the new name in the to() chain:

  button.bind( 'isEnabled' ).to( command, 'isWorking' );
  

  It is possible to bind more than one property at a time to shorten the code:

  button.bind( 'isEnabled', 'value' ).to( command );
  

  which corresponds to:

  button.bind( 'isEnabled' ).to( command );
  button.bind( 'value' ).to( command );
  

  The binding can include more than one observable, combining multiple data sources in a custom callback:

  button.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',
  	( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );
  

  Using a custom callback allows processing the value before passing it to the target property:

  button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
  

  It is also possible to bind to the same property in an array of observables. To bind a button to multiple commands (also Observables) so that each and every one of them must be enabled for the button to become enabled, use the following code:

  button.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',
  	( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );
  

  Type parameters

  K

  Parameters

  bindProperty : K

  Observable property that will be bound to other observable(s).

  Returns

  SingleBindChain<K, DragDropExperimental[ K ]>

  The bind chain with the to() and toMany() methods.

• inherited

  clearForceDisabled( id ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#clearForceDisabled

  See source

  Clears forced disable previously set through forceDisabled. See forceDisabled.

  Parameters

  id : string

  Unique identifier, equal to the one passed in forceDisabled call.

  Returns

  void

• inherited

  decorate( methodName ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#decorate

  See source

  Turns the given methods of this object into event-based ones. This means that the new method will fire an event (named after the method) and the original action will be plugged as a listener to that event.

  Read more in the dedicated guide covering the topic of decorating methods with some additional examples.

  Decorating the method does not change its behavior (it only adds an event), but it allows to modify it later on by listening to the method's event.

  For example, to cancel the method execution the event can be stopped:

  class Foo extends ObservableMixin() {
  	constructor() {
  		super();
  		this.decorate( 'method' );
  	}
  
  	method() {
  		console.log( 'called!' );
  	}
  }
  
  const foo = new Foo();
  foo.on( 'method', ( evt ) => {
  	evt.stop();
  }, { priority: 'high' } );
  
  foo.method(); // Nothing is logged.
  

  Note: The high priority listener has been used to execute this particular callback before the one which calls the original method (which uses the "normal" priority).

  It is also possible to change the returned value:

  foo.on( 'method', ( evt ) => {
  	evt.return = 'Foo!';
  } );
  
  foo.method(); // -> 'Foo'
  

  Finally, it is possible to access and modify the arguments the method is called with:

  method( a, b ) {
  	console.log( `${ a }, ${ b }`  );
  }
  
  // ...
  
  foo.on( 'method', ( evt, args ) => {
  	args[ 0 ] = 3;
  
  	console.log( args[ 1 ] ); // -> 2
  }, { priority: 'high' } );
  
  foo.method( 1, 2 ); // -> '3, 2'
  

  Parameters

  methodName : 'off' | 'on' | 'once' | 'listenTo' | 'stopListening' | 'fire' | 'delegate' | 'stopDelegating' | 'set' | 'bind' | 'unbind' | 'decorate' | 'destroy' | 'init' | 'isEnabled' | 'editor' | 'forceDisabled' | 'clearForceDisabled'

  Name of the method to decorate.

  Returns

  void

• inherited

  delegate( events ) → EmitterMixinDelegateChainmodule:clipboard/dragdropexperimental~DragDropExperimental#delegate

  See source

  Delegates selected events to another Emitter. For instance:

  emitterA.delegate( 'eventX' ).to( emitterB );
  emitterA.delegate( 'eventX', 'eventY' ).to( emitterC );
  

  then eventX is delegated (fired by) emitterB and emitterC along with data:

  emitterA.fire( 'eventX', data );
  

  and eventY is delegated (fired by) emitterC along with data:

  emitterA.fire( 'eventY', data );
  

  Parameters

  events : Array<string>

  Event names that will be delegated to another emitter.

  Returns

  EmitterMixinDelegateChain

• destroy() → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#destroy

  See source

  Destroys the plugin.

  Note: This method is optional. A plugin instance does not need to have it defined.

  Returns

  void

• inherited

  fire( eventOrInfo, args ) → GetEventInfo<TEvent>[ 'return' ]module:clipboard/dragdropexperimental~DragDropExperimental#fire

  See source

  Fires an event, executing all callbacks registered for it.

  The first parameter passed to callbacks is an EventInfo object, followed by the optional args provided in the fire() method call.

  Type parameters

  TEvent : extends BaseEvent

  The type describing the event. See BaseEvent.

  Parameters

  eventOrInfo : GetNameOrEventInfo<TEvent>

  The name of the event or EventInfo object if event is delegated.

  args : TEvent[ 'args' ]

  Additional arguments to be passed to the callbacks.

  Returns

  GetEventInfo<TEvent>[ 'return' ]

  By default the method returns undefined. However, the return value can be changed by listeners through modification of the evt.return's property (the event info is the first param of every callback).

• inherited

  forceDisabled( id ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#forceDisabled

  See source

  Disables the plugin.

  Plugin may be disabled by multiple features or algorithms (at once). When disabling a plugin, unique id should be passed (e.g. feature name). The same identifier should be used when enabling back the plugin. The plugin becomes enabled only after all features enabled it back.

  Disabling and enabling a plugin:

  plugin.isEnabled; // -> true
  plugin.forceDisabled( 'MyFeature' );
  plugin.isEnabled; // -> false
  plugin.clearForceDisabled( 'MyFeature' );
  plugin.isEnabled; // -> true
  

  Plugin disabled by multiple features:

  plugin.forceDisabled( 'MyFeature' );
  plugin.forceDisabled( 'OtherFeature' );
  plugin.clearForceDisabled( 'MyFeature' );
  plugin.isEnabled; // -> false
  plugin.clearForceDisabled( 'OtherFeature' );
  plugin.isEnabled; // -> true
  

  Multiple disabling with the same identifier is redundant:

  plugin.forceDisabled( 'MyFeature' );
  plugin.forceDisabled( 'MyFeature' );
  plugin.clearForceDisabled( 'MyFeature' );
  plugin.isEnabled; // -> true
  

  Note: some plugins or algorithms may have more complex logic when it comes to enabling or disabling certain plugins, so the plugin might be still disabled after clearForceDisabled was used.

  Parameters

  id : string

  Unique identifier for disabling. Use the same id when enabling back the plugin.

  Returns

  void

• init() → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#init

  See source

  Returns

  void

• inherited

  listenTo( emitter, event, callback, [ options ] ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#listenTo:BASE_EMITTER

  See source

  Registers a callback function to be executed when an event is fired in a specific (emitter) object.

  Events can be grouped in namespaces using :. When namespaced event is fired, it additionally fires all callbacks for that namespace.

  // myEmitter.on( ... ) is a shorthand for myEmitter.listenTo( myEmitter, ... ).
  myEmitter.on( 'myGroup', genericCallback );
  myEmitter.on( 'myGroup:myEvent', specificCallback );
  
  // genericCallback is fired.
  myEmitter.fire( 'myGroup' );
  // both genericCallback and specificCallback are fired.
  myEmitter.fire( 'myGroup:myEvent' );
  // genericCallback is fired even though there are no callbacks for "foo".
  myEmitter.fire( 'myGroup:foo' );
  

  An event callback can stop the event and set the return value of the fire method.

  Type parameters

  TEvent : extends BaseEvent

  The type describing the event. See BaseEvent.

  Parameters

  emitter : Emitter

  The object that fires the event.

  event : TEvent[ 'name' ]

  The name of the event.

  callback : GetCallback<TEvent>

  The function to be called on event.

  [ options ] : GetCallbackOptions<TEvent>

  Additional options.

  Returns

  void

• inherited

  off( event, callback ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#off

  See source

  Stops executing the callback on the given event. Shorthand for this.stopListening( this, event, callback ).

  Parameters

  event : string

  The name of the event.

  callback : Function

  The function to stop being called.

  Returns

  void

• inherited

  on( event, callback, [ options ] ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#on

  See source

  Registers a callback function to be executed when an event is fired.

  Shorthand for this.listenTo( this, event, callback, options ) (it makes the emitter listen on itself).

  Type parameters

  TEvent : extends BaseEvent

  The type descibing the event. See BaseEvent.

  Parameters

  event : TEvent[ 'name' ]

  The name of the event.

  callback : GetCallback<TEvent>

  The function to be called on event.

  [ options ] : GetCallbackOptions<TEvent>

  Additional options.

  Returns

  void

• inherited

  once( event, callback, [ options ] ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#once

  See source

  Registers a callback function to be executed on the next time the event is fired only. This is similar to calling on followed by off in the callback.

  Type parameters

  TEvent : extends BaseEvent

  The type descibing the event. See BaseEvent.

  Parameters

  event : TEvent[ 'name' ]

  The name of the event.

  callback : GetCallback<TEvent>

  The function to be called on event.

  [ options ] : GetCallbackOptions<TEvent>

  Additional options.

  Returns

  void

• inherited

  set( values ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#set:OBJECT

  See source

  Creates and sets the value of an observable properties of this object. Such a property becomes a part of the state and is observable.

  It accepts a single object literal containing key/value pairs with properties to be set.

  This method throws the observable-set-cannot-override error if the observable instance already has a property with the given property name. This prevents from mistakenly overriding existing properties and methods, but means that foo.set( 'bar', 1 ) may be slightly slower than foo.bar = 1.

  In TypeScript, those properties should be declared in class using declare keyword. In example:

  public declare myProp1: number;
  public declare myProp2: string;
  
  constructor() {
  	this.set( {
  		'myProp1: 2,
  		'myProp2: 'foo'
  	} );
  }
  

  Parameters

  values : object

  An object with name=>value pairs.

  Returns

  void

• inherited

  set( name, value ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#set:KEY_VALUE

  See source

  Creates and sets the value of an observable property of this object. Such a property becomes a part of the state and is observable.

  This method throws the observable-set-cannot-override error if the observable instance already has a property with the given property name. This prevents from mistakenly overriding existing properties and methods, but means that foo.set( 'bar', 1 ) may be slightly slower than foo.bar = 1.

  In TypeScript, those properties should be declared in class using declare keyword. In example:

  public declare myProp: number;
  
  constructor() {
  	this.set( 'myProp', 2 );
  }
  

  Type parameters

  K

  Parameters

  name : K

  The property's name.

  value : DragDropExperimental[ K ]

  The property's value.

  Returns

  void

• inherited

  stopDelegating( [ event ], [ emitter ] ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#stopDelegating

  See source

  Stops delegating events. It can be used at different levels:

  • To stop delegating all events.
  • To stop delegating a specific event to all emitters.
  • To stop delegating a specific event to a specific emitter.

  Parameters

  [ event ] : string

  The name of the event to stop delegating. If omitted, stops it all delegations.

  [ emitter ] : Emitter

  (requires event) The object to stop delegating a particular event to. If omitted, stops delegation of event to all emitters.

  Returns

  void

• inherited

  stopListening( [ emitter ], [ event ], [ callback ] ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#stopListening:BASE_STOP

  See source

  Stops listening for events. It can be used at different levels:

  • To stop listening to a specific callback.
  • To stop listening to a specific event.
  • To stop listening to all events fired by a specific object.
  • To stop listening to all events fired by all objects.

  Parameters

  [ emitter ] : Emitter

  The object to stop listening to. If omitted, stops it for all objects.

  [ event ] : string

  (Requires the emitter) The name of the event to stop listening to. If omitted, stops it for all events from emitter.

  [ callback ] : Function

  (Requires the event) The function to be removed from the call list for the given event.

  Returns

  void

• inherited

  unbind( unbindProperties ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#unbind

  See source

  Removes the binding created with bind.

  // Removes the binding for the 'a' property.
  A.unbind( 'a' );
  
  // Removes bindings for all properties.
  A.unbind();
  

  Parameters

  unbindProperties : Array<'off' | 'on' | 'once' | 'listenTo' | 'stopListening' | 'fire' | 'delegate' | 'stopDelegating' | 'set' | 'bind' | 'unbind' | 'decorate' | 'destroy' | 'init' | 'isEnabled' | 'editor' | 'forceDisabled' | 'clearForceDisabled'>

  Observable properties to be unbound. All the bindings will be released if no properties are provided.

  Returns

  void

• private

  _clearDraggableAttributes() → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#_clearDraggableAttributes

  See source

  Removes the draggable attribute from the element that was used for dragging.

  Returns

  void

• private

  _finalizeDragging( moved ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#_finalizeDragging

  See source

  Deletes the dragged content from its original range and clears the dragging state.

  Parameters

  moved : boolean

  Whether the move succeeded.

  Returns

  void

• private

  _prepareDraggedRange( target ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#_prepareDraggedRange

  See source

  Sets the dragged source range based on event target and document selection.

  Parameters

  target : Element

  Returns

  void

• private

  _setupClipboardInputIntegration() → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#_setupClipboardInputIntegration

  See source

  Integration with the clipboardInput event.

  Returns

  void

• private

  _setupContentInsertionIntegration() → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#_setupContentInsertionIntegration

  See source

  Integration with the contentInsertion event of the clipboard pipeline.

  Returns

  void

• private

  _setupDraggableAttributeHandling() → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#_setupDraggableAttributeHandling

  See source

  Adds listeners that add the draggable attribute to the elements while the mouse button is down so the dragging could start.

  Returns

  void

• private

  _setupDragging() → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#_setupDragging

  See source

  Drag and drop events handling.

  Returns

  void

• private

  _updatePreview( dataTransfer ) → voidmodule:clipboard/dragdropexperimental~DragDropExperimental#_updatePreview

  See source

  Updates the dragged preview image.

  Parameters

  dataTransfer : DataTransfer

  Returns

  void

Events

• inherited

  change:isEnabled( eventInfo, name, value, oldValue )module:clipboard/dragdropexperimental~DragDropExperimental#event:change:isEnabled

  See source

  Fired when the isEnabled property changed value.

  Parameters

  eventInfo : EventInfo

  An object containing information about the fired event.

  name : string

  Name of the changed property (isEnabled).

  value : boolean

  New value of the isEnabled property with given key or null, if operation should remove property.

  oldValue : boolean

  Old value of the isEnabled property with given key or null, if property was not set before.

• inherited

  change:{property}( eventInfo, name, value, oldValue )module:clipboard/dragdropexperimental~DragDropExperimental#event:change:{property}

  See source

  Fired when a property changed value.

  observable.set( 'prop', 1 );
  
  observable.on<ObservableChangeEvent<number>>( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {
  	console.log( `${ propertyName } has changed from ${ oldValue } to ${ newValue }` );
  } );
  
  observable.prop = 2; // -> 'prop has changed from 1 to 2'
  

  Parameters

  eventInfo : EventInfo

  An object containing information about the fired event.

  name : string

  The property name.

  value : TValue

  The new property value.

  oldValue : TValue

  The previous property value.

• inherited

  set:isEnabled( eventInfo, name, value, oldValue )module:clipboard/dragdropexperimental~DragDropExperimental#event:set:isEnabled

  See source

  Fired when the isEnabled property is going to be set but is not set yet (before the change event is fired).

  Parameters

  eventInfo : EventInfo

  An object containing information about the fired event.

  name : string

  Name of the changed property (isEnabled).

  value : boolean

  New value of the isEnabled property with given key or null, if operation should remove property.

  oldValue : boolean

  Old value of the isEnabled property with given key or null, if property was not set before.

• inherited

  set:{property}( eventInfo, name, value, oldValue )module:clipboard/dragdropexperimental~DragDropExperimental#event:set:{property}

  See source

  Fired when a property value is going to be set but is not set yet (before the change event is fired).

  You can control the final value of the property by using the event's return property.

  observable.set( 'prop', 1 );
  
  observable.on<ObservableSetEvent<number>>( 'set:prop', ( evt, propertyName, newValue, oldValue ) => {
  	console.log( `Value is going to be changed from ${ oldValue } to ${ newValue }` );
  	console.log( `Current property value is ${ observable[ propertyName ] }` );
  
  	// Let's override the value.
  	evt.return = 3;
  } );
  
  observable.on<ObservableChangeEvent<number>>( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {
  	console.log( `Value has changed from ${ oldValue } to ${ newValue }` );
  } );
  
  observable.prop = 2; // -> 'Value is going to be changed from 1 to 2'
                       // -> 'Current property value is 1'
                       // -> 'Value has changed from 1 to 3'
  

  Note: The event is fired even when the new value is the same as the old value.

  Parameters

  eventInfo : EventInfo

  An object containing information about the fired event.

  name : string

  The property name.

  value : TValue

  The new property value.

  oldValue : TValue

  The previous property value.