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Filename : plugin.js
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'use strict';

// Register the plugin within the editor.
CKEDITOR.plugins.add( 'simplebox', {
	// This plugin requires the Widgets System defined in the 'widget' plugin.
	requires: 'widget,dialog',

	// Register the icon used for the toolbar button. It must be the same
	// as the name of the widget.
	icons: 'simplebox',

	// The plugin initialization logic goes inside this method.
	init: function( editor ) {
		// Register the editing dialog.
		CKEDITOR.dialog.add( 'simplebox', this.path + 'dialogs/simplebox.js' );

		// Register the simplebox widget.
		editor.widgets.add( 'simplebox', {
			// Allow all HTML elements, classes, and styles that this widget requires.
			// Read more about the Advanced Content Filter here:
			// * https://ckeditor.com/docs/ckeditor4/latest/guide/dev_advanced_content_filter.html
			// * https://ckeditor.com/docs/ckeditor4/latest/guide/plugin_sdk_integration_with_acf.html
			allowedContent:
				'div(!simplebox,align-left,align-right,align-center){width};' +
				'div(!simplebox-content); h2(!simplebox-title)',

			// Minimum HTML which is required by this widget to work.
			requiredContent: 'div(simplebox)',

			// Define two nested editable areas.
			editables: {
				title: {
					// Define CSS selector used for finding the element inside widget element.
					selector: '.simplebox-title',
					// Define content allowed in this nested editable. Its content will be
					// filtered accordingly and the toolbar will be adjusted when this editable
					// is focused.
					allowedContent: 'br strong em'
				},
				content: {
					selector: '.simplebox-content'
				}
			},

			// Define the template of a new Simple Box widget.
			// The template will be used when creating new instances of the Simple Box widget.
			template:
				'<div class="simplebox">' +
					'<h2 class="simplebox-title">Title</h2>' +
					'<div class="simplebox-content"><p>Content...</p></div>' +
				'</div>',

			// Define the label for a widget toolbar button which will be automatically
			// created by the Widgets System. This button will insert a new widget instance
			// created from the template defined above, or will edit selected widget
			// (see second part of this tutorial to learn about editing widgets).
			//
			// Note: In order to be able to translate your widget you should use the
			// editor.lang.simplebox.* property. A string was used directly here to simplify this tutorial.
			button: 'Create a simple box',

			// Set the widget dialog window name. This enables the automatic widget-dialog binding.
			// This dialog window will be opened when creating a new widget or editing an existing one.
			dialog: 'simplebox',

			// Check the elements that need to be converted to widgets.
			//
			// Note: The "element" argument is an instance of https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_htmlParser_element.html
			// so it is not a real DOM element yet. This is caused by the fact that upcasting is performed
			// during data processing which is done on DOM represented by JavaScript objects.
			upcast: function( element ) {
				// Return "true" (that element needs to converted to a Simple Box widget)
				// for all <div> elements with a "simplebox" class.
				return element.name == 'div' && element.hasClass( 'simplebox' );
			},

			// When a widget is being initialized, we need to read the data ("align" and "width")
			// from DOM and set it by using the widget.setData() method.
			// More code which needs to be executed when DOM is available may go here.
			init: function() {
				var width = this.element.getStyle( 'width' );
				if ( width )
					this.setData( 'width', width );

				if ( this.element.hasClass( 'align-left' ) )
					this.setData( 'align', 'left' );
				if ( this.element.hasClass( 'align-right' ) )
					this.setData( 'align', 'right' );
				if ( this.element.hasClass( 'align-center' ) )
					this.setData( 'align', 'center' );
			},

			// Listen on the widget#data event which is fired every time the widget data changes
			// and updates the widget's view.
			// Data may be changed by using the widget.setData() method, which we use in the
			// Simple Box dialog window.
			data: function() {
				// Check whether "width" widget data is set and remove or set "width" CSS style.
				// The style is set on widget main element (div.simplebox).
				if ( !this.data.width )
					this.element.removeStyle( 'width' );
				else
					this.element.setStyle( 'width', this.data.width );

				// Brutally remove all align classes and set a new one if "align" widget data is set.
				this.element.removeClass( 'align-left' );
				this.element.removeClass( 'align-right' );
				this.element.removeClass( 'align-center' );
				if ( this.data.align )
					this.element.addClass( 'align-' + this.data.align );
			}
		} );
	}
} );