@ckeditor/ckeditor5-image/src/image/imageblockediting.js

/**
 * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
/**
 * @module image/image/imageblockediting
 */
import { Plugin } from 'ckeditor5/src/core.js';
import { ClipboardPipeline } from 'ckeditor5/src/clipboard.js';
import { UpcastWriter } from 'ckeditor5/src/engine.js';
import { downcastImageAttribute, downcastSrcsetAttribute, upcastImageFigure } from './converters.js';
import ImageEditing from './imageediting.js';
import ImageSizeAttributes from '../imagesizeattributes.js';
import ImageTypeCommand from './imagetypecommand.js';
import ImageUtils from '../imageutils.js';
import { getImgViewElementMatcher, createBlockImageViewElement, determineImageTypeForInsertionAtSelection } from './utils.js';
import ImagePlaceholder from './imageplaceholder.js';
/**
 * The image block plugin.
 *
 * It registers:
 *
 * * `<imageBlock>` as a block element in the document schema, and allows `alt`, `src` and `srcset` attributes.
 * * converters for editing and data pipelines.,
 * * {@link module:image/image/imagetypecommand~ImageTypeCommand `'imageTypeBlock'`} command that converts inline images into
 * block images.
 */
export default class ImageBlockEditing extends Plugin {
    /**
     * @inheritDoc
     */
    static get requires() {
        return [ImageEditing, ImageSizeAttributes, ImageUtils, ImagePlaceholder, ClipboardPipeline];
    }
    /**
     * @inheritDoc
     */
    static get pluginName() {
        return 'ImageBlockEditing';
    }
    /**
     * @inheritDoc
     */
    init() {
        const editor = this.editor;
        const schema = editor.model.schema;
        // Converters 'alt' and 'srcset' are added in 'ImageEditing' plugin.
        schema.register('imageBlock', {
            inheritAllFrom: '$blockObject',
            allowAttributes: ['alt', 'src', 'srcset']
        });
        this._setupConversion();
        if (editor.plugins.has('ImageInlineEditing')) {
            editor.commands.add('imageTypeBlock', new ImageTypeCommand(this.editor, 'imageBlock'));
            this._setupClipboardIntegration();
        }
    }
    /**
     * Configures conversion pipelines to support upcasting and downcasting
     * block images (block image widgets) and their attributes.
     */
    _setupConversion() {
        const editor = this.editor;
        const t = editor.t;
        const conversion = editor.conversion;
        const imageUtils = editor.plugins.get('ImageUtils');
        conversion.for('dataDowncast')
            .elementToStructure({
            model: 'imageBlock',
            view: (modelElement, { writer }) => createBlockImageViewElement(writer)
        });
        conversion.for('editingDowncast')
            .elementToStructure({
            model: 'imageBlock',
            view: (modelElement, { writer }) => imageUtils.toImageWidget(createBlockImageViewElement(writer), writer, t('image widget'))
        });
        conversion.for('downcast')
            .add(downcastImageAttribute(imageUtils, 'imageBlock', 'src'))
            .add(downcastImageAttribute(imageUtils, 'imageBlock', 'alt'))
            .add(downcastSrcsetAttribute(imageUtils, 'imageBlock'));
        // More image related upcasts are in 'ImageEditing' plugin.
        conversion.for('upcast')
            .elementToElement({
            view: getImgViewElementMatcher(editor, 'imageBlock'),
            model: (viewImage, { writer }) => writer.createElement('imageBlock', viewImage.hasAttribute('src') ? { src: viewImage.getAttribute('src') } : undefined)
        })
            .add(upcastImageFigure(imageUtils));
    }
    /**
     * Integrates the plugin with the clipboard pipeline.
     *
     * Idea is that the feature should recognize the user's intent when an **inline** image is
     * pasted or dropped. If such an image is pasted/dropped:
     *
     * * into an empty block (e.g. an empty paragraph),
     * * on another object (e.g. some block widget).
     *
     * it gets converted into a block image on the fly. We assume this is the user's intent
     * if they decided to put their image there.
     *
     * See the `ImageInlineEditing` for the similar integration that works in the opposite direction.
     *
     * The feature also sets image `width` and `height` attributes on paste.
     */
    _setupClipboardIntegration() {
        const editor = this.editor;
        const model = editor.model;
        const editingView = editor.editing.view;
        const imageUtils = editor.plugins.get('ImageUtils');
        const clipboardPipeline = editor.plugins.get('ClipboardPipeline');
        this.listenTo(clipboardPipeline, 'inputTransformation', (evt, data) => {
            const docFragmentChildren = Array.from(data.content.getChildren());
            let modelRange;
            // Make sure only <img> elements are dropped or pasted. Otherwise, if there some other HTML
            // mixed up, this should be handled as a regular paste.
            if (!docFragmentChildren.every(imageUtils.isInlineImageView)) {
                return;
            }
            // When drag and dropping, data.targetRanges specifies where to drop because
            // this is usually a different place than the current model selection (the user
            // uses a drop marker to specify the drop location).
            if (data.targetRanges) {
                modelRange = editor.editing.mapper.toModelRange(data.targetRanges[0]);
            }
            // Pasting, however, always occurs at the current model selection.
            else {
                modelRange = model.document.selection.getFirstRange();
            }
            const selection = model.createSelection(modelRange);
            // Convert inline images into block images only when the currently selected block is empty
            // (e.g. an empty paragraph) or some object is selected (to replace it).
            if (determineImageTypeForInsertionAtSelection(model.schema, selection) === 'imageBlock') {
                const writer = new UpcastWriter(editingView.document);
                // Wrap <img ... /> -> <figure class="image"><img .../></figure>
                const blockViewImages = docFragmentChildren.map(inlineViewImage => writer.createElement('figure', { class: 'image' }, inlineViewImage));
                data.content = writer.createDocumentFragment(blockViewImages);
            }
        });
        this.listenTo(clipboardPipeline, 'contentInsertion', (evt, data) => {
            if (data.method !== 'paste') {
                return;
            }
            model.change(writer => {
                const range = writer.createRangeIn(data.content);
                for (const item of range.getItems()) {
                    if (item.is('element', 'imageBlock')) {
                        imageUtils.setImageNaturalSizeAttributes(item);
                    }
                }
            });
        });
    }
}