Initial implementation of the plugin.

src/KbdUI.js

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+
+import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+import ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';
+
+import kbdIcon from '../icons/kbd.svg';
+
+const KBD = 'kbd';
+
+/**
+ * The keyboard shortcut UI feature. It brings a proper button.
+ *
+ * @extends module:core/plugin~Plugin
+ */
+export default class KbdUI extends Plugin {
+	/**
+	 * @inheritDoc
+	 */
+	init() {
+		const editor = this.editor;
+		const t = editor.t;
+
+		editor.ui.componentFactory.add( KBD, locale => {
+			const command = editor.commands.get( KBD );
+			const view = new ButtonView( locale );
+
+			view.set( {
+				label: t( 'Keyboard shortcut' ),
+				icon: kbdIcon,
+				keystroke: 'ALT+SHIFT+K',
+				tooltip: true,
+				isToggleable: true
+			} );
+
+			view.bind( 'isOn', 'isEnabled' ).to( command, 'value', 'isEnabled' );
+
+			// Execute command.
+			this.listenTo( view, 'execute', () => {
+				editor.execute( KBD );
+				editor.editing.view.focus();
+			} );
+
+			return view;
+		} );
+	}
+}