Merge pull request #546 from ckeditor/i/6109

Feature: Introduce `FormHeaderView` UI component. Closes ckeditor/ckeditor5#6109.

src/formheader/formheaderview.js

@@ -0,0 +1,96 @@
+/**
+ * @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/formheader/formheaderview
+ */
+
+import View from '../view';
+
+import '../../theme/components/formheader/formheader.css';
+
+/**
+ * The class component representing a form header view. It should be used in more advanced forms to
+ * describe the main purpose of the form.
+ *
+ * By default the component contains a bolded label view that has to be set. The label is usually a short (at most 3-word) string.
+ * The component can also be extended by any other elements, like: icons, dropdowns, etc.
+ *
+ * It is used i.a.
+ * by {@link module:table/tablecellproperties/ui/tablecellpropertiesview~TableCellPropertiesView}
+ * and {@link module:special-characters/ui/specialcharactersnavigationview~SpecialCharactersNavigationView}.
+ *
+ * The latter is an example, where the component has been extended by {@link module:ui/dropdown/dropdownview~DropdownView} view.
+ *
+ * @extends module:ui/view~View
+ */
+export default class FormHeaderView extends View {
+	/**
+	 * Creates an instance of the form header class.
+	 *
+	 * @param {module:utils/locale~Locale} locale The locale instance.
+	 * @param {Object} options
+	 * @param {String} [options.label] A label.
+	 * @param {String} [options.class] An additional class.
+	 */
+	constructor( locale, options = {} ) {
+		super( locale );
+
+		const bind = this.bindTemplate;
+
+		/**
+		 * The label of the header.
+		 *
+		 * @observable
+		 * @member {String} #label
+		 */
+		this.set( 'label', options.label || '' );
+
+		/**
+		 * An additional CSS class added to the {@link #element}.
+		 *
+		 * @observable
+		 * @member {String} #class
+		 */
+		this.set( 'class', options.class || null );
+
+		/**
+		 * A collection of header items.
+		 *
+		 * @readonly
+		 * @member {module:ui/viewcollection~ViewCollection}
+		 */
+		this.children = this.createCollection();
+
+		this.setTemplate( {
+			tag: 'div',
+			attributes: {
+				class: [
+					'ck',
+					'ck-form__header',
+					bind.to( 'class' )
+				]
+			},
+			children: this.children
+		} );
+
+		const label = new View( locale );
+
+		label.setTemplate( {
+			tag: 'span',
+			attributes: {
+				class: [
+					'ck',
+					'ck-form__header__label'
+				]
+			},
+			children: [
+				{ text: bind.to( 'label' ) }
+			]
+		} );
+
+		this.children.add( label );
+	}
+}

tests/formheader/formheaderview.js

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+/**
+ * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
+ */
+
+import View from '../../src/view';
+import ViewCollection from '../../src/viewcollection';
+import FormHeaderView from '../../src/formheader/formheaderview';
+
+describe( 'FormHeaderView', () => {
+	let view, locale;
+
+	beforeEach( () => {
+		locale = { t: val => val };
+		view = new FormHeaderView( locale );
+		view.render();
+	} );
+
+	afterEach( () => {
+		view.element.remove();
+	} );
+
+	describe( 'constructor()', () => {
+		it( 'should set view#locale', () => {
+			expect( view.locale ).to.equal( locale );
+		} );
+
+		it( 'should create view#children collection', () => {
+			expect( view.children ).to.be.instanceOf( ViewCollection );
+			expect( view.children ).to.have.length( 1 );
+		} );
+
+		it( 'should set view#label', () => {
+			expect( view.label ).to.equal( '' );
+		} );
+
+		it( 'should set view#class', () => {
+			expect( view.class ).to.be.null;
+		} );
+
+		it( 'should set the template', () => {
+			expect( view.element.classList.contains( 'ck' ) ).to.be.true;
+			expect( view.element.classList.contains( 'ck-form__header' ) ).to.be.true;
+		} );
+
+		describe( 'options', () => {
+			it( 'should set view#class when class was passed', () => {
+				const view = new FormHeaderView( locale, {
+					class: 'foo'
+				} );
+
+				expect( view.class ).to.equal( 'foo' );
+
+				view.destroy();
+			} );
+
+			it( 'should use a label text when passed', () => {
+				const view = new FormHeaderView( locale, {
+					label: 'foo'
+				} );
+
+				view.render();
+
+				expect( view.element.firstChild.classList.contains( 'ck' ) ).to.be.true;
+				expect( view.element.firstChild.classList.contains( 'ck-form__header__label' ) ).to.be.true;
+				expect( view.element.firstChild.textContent ).to.equal( 'foo' );
+
+				view.destroy();
+			} );
+		} );
+
+		describe( 'template bindings', () => {
+			it( 'should bind #class to the template', () => {
+				view.class = 'foo';
+				expect( view.element.classList.contains( 'foo' ) ).to.be.true;
+			} );
+
+			it( 'should bind #label to the template', () => {
+				view.label = 'bar';
+				expect( view.element.firstChild.textContent ).to.equal( 'bar' );
+
+				view.label = 'baz';
+				expect( view.element.firstChild.textContent ).to.equal( 'baz' );
+			} );
+
+			it( 'should bind #children to the template', () => {
+				const child = new View();
+				child.setTemplate( { tag: 'div' } );
+
+				view.children.add( child );
+
+				expect( view.element.childNodes[ 1 ] ).to.equal( child.element );
+
+				view.destroy();
+			} );
+		} );
+	} );
+} );

theme/components/formheader/formheader.css

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+/*
+ * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
+ */
+
+:root {
+	--ck-table-form-header-height: 38px;
+}
+
+.ck.ck-form__header {
+  display: flex;
+	flex-direction: row;
+	flex-wrap: nowrap;
+	align-items: center;
+	justify-content: space-between;
+	padding: var(--ck-spacing-small) var(--ck-spacing-large);
+	height: var(--ck-table-form-header-height);
+	line-height: var(--ck-table-form-header-height);
+	border-bottom: 1px solid var(--ck-color-base-border);
+
+	& .ck-form__header__label {
+		font-weight: bold;
+	}
+}