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Class

ImageCaptionUtils (image/imagecaptionutils)

@ckeditor/ckeditor5-image/src/imagecaptionutils/utils

class
See source

The image caption utilities plugin.

Filtering

Properties

  • readonly inherited

    editor : Editor

    See source

    The editor instance.

    Note that most editors implement the EditorWithUI interface in addition to the base Editor interface. However, editors with an external UI (i.e. Bootstrap-based) or a headless editor may not implement the EditorWithUI interface.

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

    • The "editing" part that only uses the Editor interface.
    • The "UI" part that uses both the Editor interface and the EditorWithUI interface.

  • readonly inherited observable

    isEnabled : Boolean

    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 inherited

    _disableStack : Set.<String>

    See source

    Holds identifiers for forceDisabled mechanism.

Static properties

  • readonly inherited static

    isContextPlugin : Boolean

    See source

    A flag which defines if a plugin is allowed or not allowed to be used directly by a Context.

  • readonly inherited static

    pluginName : String | undefined

    See source

    An optional name of the plugin. If set, the plugin will be available in get by its name and its constructor. If not, then only by its constructor.

    The name should reflect the constructor name.

    To keep the plugin class definition tight, it is recommended to define this property as a static getter:

    export default class ImageCaption {
	static get pluginName() {
		return 'ImageCaption';
	}
}

    Note: The native Function.name property could not be used to keep the plugin name because it will be mangled during code minification.

    Naming a plugin is necessary to enable removing it through the config.removePlugins option.

  • readonly inherited static

    requires : Array.<Function> | undefined

    See source

    An array of plugins required by this plugin.

    To keep the plugin class definition tight it is recommended to define this property as a static getter:

    import Image from './image.js';

export default class ImageCaption {
	static get requires() {
		return [ Image ];
	}
}

Methods

  • inherited

    constructor( editor )

    See source

    Creates a new plugin instance. This is the first step of the plugin initialization. See also init and afterInit.

    A plugin is always instantiated after its dependencies and the init and afterInit methods are called in the same order.

    Usually, you will want to put your plugin's initialization code in the init method. The constructor can be understood as "before init" and used in special cases, just like afterInit serves the special "after init" scenarios (e.g.the code which depends on other plugins, but which does not explicitly require them).

    Parameters

    editor : Editor

  • inherited

    afterInit() → null | Promise

    See source

    The third (and last) stage of the plugin initialization. See also constructor and init.

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

    Returns

    null | Promise

  • mixed

    bind( bindProperties ) → Object

    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 : String

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

    Returns

    Object

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

  • inherited

    clearForceDisabled( id )

    See source

    Clears forced disable previously set through forceDisabled. See forceDisabled.

    Parameters

    id : String

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

  • mixed

    decorate( methodName )

    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 {
	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: 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 : String

    Name of the method to decorate.

  • mixed

    delegate( events ) → EmitterMixinDelegateChain

    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 : String

    Event names that will be delegated to another emitter.

    Returns

    EmitterMixinDelegateChain

  • inherited

    destroy() → null | Promise

    See source

    Destroys the plugin.

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

    Returns

    null | Promise

  • mixed

    fire( eventOrInfo, [ args ] ) → *

    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.

    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).

  • inherited

    forceDisabled( id )

    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.

  • getCaptionFromImageModelElement( imageModelElement ) → Element | null

    See source

    Returns the caption model element from a given image element. Returns null if no caption is found.

    Parameters

    imageModelElement : Element

    Returns

    Element | null

  • getCaptionFromModelSelection( selection ) → Element | null

    See source

    Returns the caption model element for a model selection. Returns null if the selection has no caption element ancestor.

    Parameters

    selection : Selection

    Returns

    Element | null

  • inherited

    init() → null | Promise

    See source

    The second stage (after plugin constructor) of the plugin initialization. Unlike the plugin constructor this method can be asynchronous.

    A plugin's init() method is called after its dependencies are initialized, so in the same order as the constructors of these plugins.

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

    Returns

    null | Promise

  • mixed

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

    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.

    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 {}

  • matchImageCaptionViewElement( element ) → Object | null

    See source

    Matcher pattern. Checks if a given element is a <figcaption> element that is placed inside the image <figure> element.

    Parameters

    element : Element

    Returns

    Object | null

    Returns the object accepted by Matcher or null if the element cannot be matched.

  • mixed

    off( event, callback )

    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.

  • mixed

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

    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).

    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 {}

  • mixed

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

    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.

    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 {}

  • mixed

    set( name, [ 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.

    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 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.

    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).

  • mixed

    stopDelegating( [ event ], [ emitter ] )

    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.

  • mixed

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

    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.

  • mixed

    unbind( [ unbindProperties ] )

    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 ] : String

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

  • protected mixed

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

    See source

    Adds callback to emitter for given event.

    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 {}

  • protected mixed

    _removeEventListener( event, callback )

    See source

    Removes callback from emitter for given event.

    Parameters

    event : String

    The name of the event.

    callback : function

    The function to stop being called.

Events

  • inherited

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

    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.

  • mixed

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

    See source

    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.

  • mixed

    set:{property}( eventInfo, name, value, oldValue )

    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( '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( '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 : *

    The new property value.

    oldValue : *

    The previous property value.