widget/utils

Starting from a DOM resize host element (an element that receives dimensions as a result of resizing), this helper returns the width of the found ancestor element.

* It searches up to 5 levels of ancestors only.

Parameters

domResizeHost : HTMLElement

Resize host DOM element that receives dimensions as a result of resizing.

Returns

number

Width of ancestor element in pixels or 0 if no ancestor with a computed width has been found.

Calculates a relative width of a domResizeHost compared to its ancestor in percents.

Parameters

domResizeHost : HTMLElement

Resize host DOM element.

resizeHostRect : Rect

Defaults to ...

Returns

number

Percentage value between 0 and 100.

Returns a model range which is optimal (in terms of UX) for inserting a widget block.

For instance, if a selection is in the middle of a paragraph, the collapsed range before this paragraph will be returned so that it is not split. If the selection is at the end of a paragraph, the collapsed range after this paragraph will be returned.

Note: If the selection is placed in an empty block, the range in that block will be returned. If that range is then passed to insertContent, the block will be fully replaced by the inserted widget block.

Parameters

selection : ModelSelection | ModelDocumentSelection

The selection based on which the insertion position should be calculated.

model : Model

Model instance.

Returns

ModelRange

The optimal range.

Returns the label of the provided element.

Parameters

element : ViewElement

Returns

string

Returns true if given ViewNode is an ViewElement and a widget.

Parameters

node : ViewTypeCheckable

Returns

boolean

Sets highlight handling methods. Uses WidgetHighlightStack to properly determine which highlight descriptor should be used at given time.

Parameters

element : ViewElement

writer : ViewDowncastWriter

add : ( element: ViewElement, descriptor: DowncastHighlightDescriptor, writer: ViewDowncastWriter ) => void

Defaults to addHighlight

remove : ( element: ViewElement, descriptor: DowncastHighlightDescriptor, writer: ViewDowncastWriter ) => void

Defaults to removeHighlight

Returns

void

Sets label for given element. It can be passed as a plain string or a function returning a string. Function will be called each time label is retrieved by getLabel().

Parameters

element : ViewElement

labelOrCreator : string | () => string

Returns

void

Converts the given ViewElement to a widget in the following way:

• sets the contenteditable attribute to "false",
• adds the ck-widget CSS class,
• adds a custom getFillerOffset() method returning null,
• adds a custom property allowing to recognize widget elements by using isWidget(),
• implements the view highlight on widgets.

This function needs to be used in conjunction with downcast conversion helpers like elementToElement(). Moreover, typically you will want to use toWidget() only for editingDowncast, while keeping the dataDowncast clean.

For example, in order to convert a <widget> model element to <div class="widget"> in the view, you can define such converters:

editor.conversion.for( 'editingDowncast' )
	.elementToElement( {
		model: 'widget',
		view: ( modelItem, { writer } ) => {
			const div = writer.createContainerElement( 'div', { class: 'widget' } );

			return toWidget( div, writer, { label: 'some widget' } );
		}
	} );

editor.conversion.for( 'dataDowncast' )
	.elementToElement( {
		model: 'widget',
		view: ( modelItem, { writer } ) => {
			return writer.createContainerElement( 'div', { class: 'widget' } );
		}
	} );

See the full source code of the widget (with a nested editable) schema definition and converters in this sample.

Parameters

element : ViewElement

writer : ViewDowncastWriter

options : object

Additional options.

Properties

[ options.hasSelectionHandle ] : boolean

If true, the widget will have a selection handle added.

[ options.label ] : string | () => string

Element's label provided to the setLabel function. It can be passed as a plain string or a function returning a string. It represents the widget for assistive technologies (like screen readers).

Defaults to {}

Returns

ViewElement

Returns the same element.

Adds functionality to the provided ViewEditableElement to act as a widget's editable:

• sets the contenteditable attribute to true when isReadOnly is false, otherwise sets it to false,
• adds the ck-editor__editable and ck-editor__nested-editable CSS classes,
• adds the ck-editor__nested-editable_focused CSS class when the editable is focused and removes it when it is blurred.
• implements the view highlight on widget's editable.
• sets the role attribute to textbox for accessibility purposes.

Similarly to toWidget() this function should be used in editingDowncast only and it is usually used together with elementToElement().

For example, in order to convert a <nested> model element to <div class="nested"> in the view, you can define such converters:

editor.conversion.for( 'editingDowncast' )
	.elementToElement( {
		model: 'nested',
		view: ( modelItem, { writer } ) => {
			const div = writer.createEditableElement( 'div', { class: 'nested' } );

			return toWidgetEditable( nested, writer, { label: 'label for editable' } );
		}
	} );

editor.conversion.for( 'dataDowncast' )
	.elementToElement( {
		model: 'nested',
		view: ( modelItem, { writer } ) => {
			return writer.createContainerElement( 'div', { class: 'nested' } );
		}
	} );

See the full source code of the widget (with nested editable) schema definition and converters in this sample.

Parameters

editable : ViewEditableElement

writer : ViewDowncastWriter

options : object

Additional options.

Properties

[ options.label ] : string

Editable's label used by assistive technologies (e.g. screen readers).

[ options.withAriaRole ] : boolean

Whether to add the role="textbox" attribute on the editable. Defaults to true.

Defaults to {}

Returns

ViewEditableElement

Returns the same element that was provided in the editable parameter

A util to be used in order to map view positions to correct model positions when implementing a widget which renders non-empty view element for an empty model element.

For example:

// Model:
<placeholder type="name"></placeholder>

// View:
<span class="placeholder">name</span>

In such case, view positions inside <span> cannot be correctly mapped to the model (because the model element is empty). To handle mapping positions inside <span class="placeholder"> to the model use this util as follows:

// Model:
<placeholder type="name"></placeholder>

// View:
<span class="placeholder">name</span>

The callback will try to map the view offset of selection to an expected model position.

1. When the position is at the end (or in the middle) of the inline widget:

// Model:
<placeholder type="name"></placeholder>

// View:
<span class="placeholder">name</span>

2. When the position is at the beginning of the inline widget:

// Model:
<placeholder type="name"></placeholder>

// View:
<span class="placeholder">name</span>

Parameters

model : Model

Model instance on which the callback operates.

viewElementMatcher : ( element: ViewElement ) => boolean

Function that is passed a view element and should return true if the custom mapping should be applied to the given view element.

Returns

GetCallback<MapperViewToModelPositionEvent>