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Class

ImageStyleCommand (image/imagestyle)

@ckeditor/ckeditor5-image/src/imagestyle/imagestylecommand

class

The image style command. It is used to apply different image styles.

Filtering

Properties

  • editor : Editor

    readonly inherited

    The editor on which this command will be used.

  • isEnabled : Boolean

    readonly inherited observable

    Flag indicating whether a command is enabled or disabled. A disabled command should do nothing when executed.

    Overrides: Command#isEnabled
  • styles : Array.<ImageStyleFormat>

    readonly

    A style handled by this command.

  • value

    readonly inherited observable

    The value of a command. Concrete command class should define what it represents.

    For example, the bold command's value is whether the selection starts in a bolded text. And the value of the link command may be an object with links details.

    It's possible for a command to have no value (e.g. for stateless actions such as imageUpload).

    Overrides: Command#value
  • _defaultStyle : Boolean | String

    private

    The cached name of the default style if it is present. If there is no default style, it defaults to false.

Methods

  • constructor( editor, styles )

    Creates an instance of the image style command. Each command instance is handling one style.

    Parameters

    editor : Editor

    The editor instance.

    styles : Array.<ImageStyleFormat>

    The styles that this command supports.

    Overrides: Command#constructor
  • bind( bindProperties ) → Object

    mixed

    Binds observable properties to another objects implementing Observable interface (like Model).

    Once bound, the observable will immediately share the current state of properties of the observable it is bound to and react to the changes to these properties in the future.

    Note: To release the binding use unbind.

    Using bind().to() chain:

    A.bind( 'a' ).to( B );
    A.bind( 'a' ).to( B, 'b' );
    A.bind( 'a', 'b' ).to( B, 'c', 'd' );
    A.bind( 'a' ).to( B, 'b', C, 'd', ( b, d ) => b + d );

    It is also possible to bind to the same property in a observables collection using bind().toMany() chain:

    A.bind( 'a' ).toMany( [ B, C, D ], 'x', ( a, b, c ) => a + b + c );
    A.bind( 'a' ).toMany( [ B, C, D ], 'x', ( ...x ) => x.every( x => x ) );

    Parameters

    bindProperties : String

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

    Returns

    Object

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

  • decorate( methodName )

    mixed

    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.

    This is a very simplified method decoration. Itself it doesn't change the behavior of a method (expect adding the event), but it allows to modify it later on by listening to the method's event.

    For example, in order to cancel the method execution one can stop the event:

    class Foo {
        constructor() {
            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: we used a high priority listener here to execute this callback before the one which calls the original method (which used the default priority).

    It's also possible to change the return value:

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

    Finally, it's possible to access and modify the parameters:

    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 : String

    Name of the method to decorate.

  • delegate( events ) → EmitterMixinDelegateChain

    mixed

    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 : String

    Event names that will be delegated to another emitter.

    Returns

    EmitterMixinDelegateChain
  • destroy()

    inherited

    Destroys the command.

  • execute( options = { options.value } )

    Executes the command.

    editor.execute( 'imageStyle', { value: 'side' } );

    Parameters

    options : Object
    Properties
    options.value : String

    The name of the style (based on the image.styles configuration option).

    Fires

    Overrides: Command#execute
  • fire( eventOrInfo, [ args ] ) → *

    mixed

    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.

    Parameters

    eventOrInfo : String | EventInfo

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

    [ args ] : *

    Additional arguments to be passed to the callbacks.

    Returns

    *

    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).

  • listenTo( emitter, event, callback, [ options ] = { [options.priority] } )

    mixed

    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.

    Parameters

    emitter : Emitter

    The object that fires the event.

    event : String

    The name of the event.

    callback : function

    The function to be called on event.

    [ options ] : Object

    Additional options.

    Properties
    [ options.priority ] : PriorityString | Number

    The priority of this event callback. The higher the priority value the sooner the callback will be fired. Events having the same priority are called in the order they were added.

    Defaults to 'normal'

    Defaults to {}

  • off( event, callback )

    mixed

    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.

  • on( event, callback, [ options ] = { [options.priority] } )

    mixed

    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).

    Parameters

    event : String

    The name of the event.

    callback : function

    The function to be called on event.

    [ options ] : Object

    Additional options.

    Properties
    [ options.priority ] : PriorityString | Number

    The priority of this event callback. The higher the priority value the sooner the callback will be fired. Events having the same priority are called in the order they were added.

    Defaults to 'normal'

    Defaults to {}

  • once( event, callback, [ options ] = { [options.priority] } )

    mixed

    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.

    Parameters

    event : String

    The name of the event.

    callback : function

    The function to be called on event.

    [ options ] : Object

    Additional options.

    Properties
    [ options.priority ] : PriorityString | Number

    The priority of this event callback. The higher the priority value the sooner the callback will be fired. Events having the same priority are called in the order they were added.

    Defaults to 'normal'

    Defaults to {}

  • refresh()

    inherited

    Refreshes the command. The command should update its isEnabled and value property in this method.

    This method is automatically called when any changes are applied to the document.

    Overrides: Command#refresh
  • set( name, [ value ] )

    mixed

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

    It accepts also 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 have 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.

    Parameters

    name : String | Object

    The property's name or object with name=>value pairs.

    [ value ] : *

    The property's value (if name was passed in the first parameter).

  • stopDelegating( [ event ], [ emitter ] )

    mixed

    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.

  • stopListening( [ emitter ], [ event ], [ callback ] )

    mixed

    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.

  • unbind( [ unbindProperties ] )

    mixed

    Removes the binding created with bind.

    A.unbind( 'a' );
    A.unbind();

    Parameters

    [ unbindProperties ] : String

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

Events

  • change:isEnabled( eventInfo, name, value, oldValue )

    inherited

    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.

  • change:value( eventInfo, name, value, oldValue )

    inherited

    Fired when the value property changed value.

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    name : String

    Name of the changed property (value).

    value : *

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

    oldValue : *

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

  • change:{property}( eventInfo, name, value, oldValue )

    mixed

    Fired when a property changed value.

    observable.set( 'prop', 1 );
    
    observable.on( '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 : *

    The new property value.

    oldValue : *

    The previous property value.

  • execute( eventInfo )

    inherited

    Event fired by the execute method. The command action is a listener to this event so it's possible to change/cancel the behavior of the command by listening to this event.

    See decorate for more information and samples.

    Note: This event is fired even if command is disabled. However, it is automatically blocked by a high priority listener in order to prevent command execution.

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.