Fix: BalloonPanelView should not be focusable. Closes #206.

T/206a: BalloonPanelView should not be focusable

src/bindings/preventdefault.js

@@ -0,0 +1,23 @@
+/**
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+/**
+ * @module ui/bindings/preventdefault
+ */
+
+/**
+ * Returns a {module:ui/template~TemplateToBinding} resulting in a native `event#preventDefault`
+ * for the DOM event if `event#target` equals {@link module:ui/view~View#element}.
+ *
+ * @param {module:ui/view~View} view View instance that uses the template.
+ * @returns {module:ui/template~TemplateToBinding}
+ */
+export default function preventDefault( view ) {
+	return view.bindTemplate.to( evt => {
+		if ( evt.target === view.element ) {
+			evt.preventDefault();
+		}
+	} );
+}

src/focuscycler.js

@@ -241,13 +241,19 @@ export default class FocusCycler {
 	 */
 	_getFocusableItem( step ) {
 		// Cache for speed.
-		const current = this.current;
+		let current = this.current;
 		const collectionLength = this.focusables.length;
 
-		if ( !collectionLength || current === null ) {
+		if ( !collectionLength ) {
 			return null;
 		}
 
+		// Start from the beginning if no view is focused.
+		// https://github.com/ckeditor/ckeditor5-ui/issues/206
+		if ( current === null ) {
+			return this[ step === 1 ? 'first' : 'last' ];
+		}
+
 		// Cycle in both directions.
 		let index = ( current + collectionLength + step ) % collectionLength;
 

src/panel/balloon/balloonpanelview.js

@@ -13,6 +13,7 @@ import { getOptimalPosition } from '@ckeditor/ckeditor5-utils/src/dom/position';
 import isRange from '@ckeditor/ckeditor5-utils/src/dom/isrange';
 import isElement from '@ckeditor/ckeditor5-utils/src/lib/lodash/isElement';
 import toUnit from '@ckeditor/ckeditor5-utils/src/dom/tounit';
+import preventDefault from '../../bindings/preventdefault.js';
 import global from '@ckeditor/ckeditor5-utils/src/dom/global';
 
 const toPx = toUnit( 'px' );
@@ -134,13 +135,15 @@ export default class BalloonPanelView extends View {
 					top: bind.to( 'top', toPx ),
 					left: bind.to( 'left', toPx ),
 					maxWidth: bind.to( 'maxWidth', toPx )
-				},
-
-				// Make this element `focusable` to be available for adding to FocusTracker.
-				tabindex: -1
+				}
 			},
 
-			children: this.content
+			children: this.content,
+
+			on: {
+				// https://github.com/ckeditor/ckeditor5-ui/issues/206
+				mousedown: preventDefault( this )
+			}
 		} );
 	}
 

src/toolbar/toolbarview.js

@@ -13,6 +13,7 @@ import FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';
 import FocusCycler from '../focuscycler';
 import KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';
 import ToolbarSeparatorView from './toolbarseparatorview';
+import preventDefault from '../bindings/preventdefault.js';
 
 /**
  * The toolbar view class.
@@ -78,7 +79,12 @@ export default class ToolbarView extends View {
 				]
 			},
 
-			children: this.items
+			children: this.items,
+
+			on: {
+				// https://github.com/ckeditor/ckeditor5-ui/issues/206
+				mousedown: preventDefault( this )
+			}
 		} );
 
 		this.items.on( 'add', ( evt, item ) => {

tests/bindings/preventdefault.js

@@ -0,0 +1,63 @@
+/**
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+/* global Event */
+
+import preventDefault from '../../src/bindings/preventdefault';
+import View from '../../src/view';
+import Template from '../../src/template';
+
+describe( 'preventDefault', () => {
+	it( 'prevents default of a native DOM event', () => {
+		const view = new View();
+
+		view.template = new Template( {
+			tag: 'div',
+
+			on: {
+				foo: preventDefault( view )
+			}
+		} );
+
+		const evt = new Event( 'foo', { bubbles: true } );
+		const spy = sinon.spy( evt, 'preventDefault' );
+
+		// Render to enable bubbling.
+		view.element;
+
+		view.element.dispatchEvent( evt );
+		sinon.assert.calledOnce( spy );
+	} );
+
+	it( 'prevents only when target is view#element', () => {
+		const view = new View();
+		const child = new View();
+
+		child.template = new Template( {
+			tag: 'a'
+		} );
+
+		view.template = new Template( {
+			tag: 'div',
+
+			on: {
+				foo: preventDefault( view )
+			},
+
+			children: [
+				child
+			]
+		} );
+
+		const evt = new Event( 'foo', { bubbles: true } );
+		const spy = sinon.spy( evt, 'preventDefault' );
+
+		// Render to enable bubbling.
+		view.element;
+
+		child.element.dispatchEvent( evt );
+		sinon.assert.notCalled( spy );
+	} );
+} );

tests/focuscycler.js

@@ -112,10 +112,10 @@ describe( 'FocusCycler', () => {
 			expect( cycler.next ).to.equal( focusables.get( 2 ) );
 		} );
 
-		it( 'returns null when no view is focused', () => {
+		it( 'focuses the first focusable view when no view is focused', () => {
 			focusTracker.focusedElement = null;
 
-			expect( cycler.next ).to.be.null;
+			expect( cycler.next ).to.equal( focusables.get( 1 ) );
 		} );
 
 		it( 'returns null when no items', () => {
@@ -162,10 +162,10 @@ describe( 'FocusCycler', () => {
 			expect( cycler.previous ).to.equal( focusables.get( 2 ) );
 		} );
 
-		it( 'returns null when no view is focused', () => {
+		it( 'focuses the last focusable view when no view is focused', () => {
 			focusTracker.focusedElement = null;
 
-			expect( cycler.previous ).to.be.null;
+			expect( cycler.previous ).to.equal( focusables.get( 3 ) );
 		} );
 
 		it( 'returns null when no items', () => {

tests/panel/balloon/balloonpanelview.js

@@ -35,7 +35,6 @@ describe( 'BalloonPanelView', () => {
 		it( 'should create element from template', () => {
 			expect( view.element.tagName ).to.equal( 'DIV' );
 			expect( view.element.classList.contains( 'ck-balloon-panel' ) ).to.true;
-			expect( view.element.getAttribute( 'tabindex' ) ).to.equal( '-1' );
 		} );
 
 		it( 'should set default values', () => {
@@ -129,6 +128,16 @@ describe( 'BalloonPanelView', () => {
 				} );
 			} );
 		} );
+
+		describe( 'event listeners', () => {
+			it( 'prevent default on #mousedown', () => {
+				const evt = new Event( 'mousedown', { bubbles: true } );
+				const spy = sinon.spy( evt, 'preventDefault' );
+
+				view.element.dispatchEvent( evt );
+				sinon.assert.calledOnce( spy );
+			} );
+		} );
 	} );
 
 	describe( 'show()', () => {

tests/toolbar/toolbarview.js

@@ -3,7 +3,7 @@
  * For licensing, see LICENSE.md.
  */
 
-/* global document */
+/* global document, Event */
 
 import ToolbarView from '../../src/toolbar/toolbarview';
 import ToolbarSeparatorView from '../../src/toolbar/toolbarseparatorview';
@@ -64,6 +64,16 @@ describe( 'ToolbarView', () => {
 		it( 'should create element from template', () => {
 			expect( view.element.classList.contains( 'ck-toolbar' ) ).to.true;
 		} );
+
+		describe( 'event listeners', () => {
+			it( 'prevent default on #mousedown', () => {
+				const evt = new Event( 'mousedown', { bubbles: true } );
+				const spy = sinon.spy( evt, 'preventDefault' );
+
+				view.element.dispatchEvent( evt );
+				sinon.assert.calledOnce( spy );
+			} );
+		} );
 	} );
 
 	describe( 'init()', () => {