ckeditor5-image-upload-base64/packages/ckeditor5-ui/src/bindings/preventdefault.js

The development environment of CKEditor 5 – the best browser-based rich text editor.

/**
 * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

/**
 * @module ui/bindings/preventdefault
 */

/**
 * A helper which executes a native `Event.preventDefault()` if the target of an event equals the
 * {@link module:ui/view~View#element element of the view}. It shortens the definition of a
 * {@link module:ui/view~View#template template}.
 *
 *		// In a class extending View.
 *		import preventDefault from '@ckeditor/ckeditor5-ui/src/bindings/preventdefault';
 *
 *		// ...
 *
 *		this.setTemplate( {
 *			tag: 'div',
 *
 *			on: {
 *				// Prevent the default mousedown action on this view.
 *				mousedown: preventDefault( this )
 *			}
 *		} );
 *
 * @param {module:ui/view~View} view View instance that defines the template.
 * @returns {module:ui/template~TemplateToBinding}
 */
export default function preventDefault( view ) {
	return view.bindTemplate.to( evt => {
		if ( evt.target === view.element ) {
			evt.preventDefault();
		}
	} );
}