feat(ItemNavigation): introduce navigationMode property (#910)

(1) The ItemNavigation now has three navigation modes: 
- "Vertical" - "Up|Down" navigation
- "Horizontal"- "Left|Right" navigation
- "Auto" - both "Vertical" and "Horizontal" navigation

(2) From now you can navigate throw the List items and Table rows only vertically
via the "Up" and "Down" arrow keys.

FIXES: #862

packages/base/src/delegate/ItemNavigation.js

@@ -9,6 +9,7 @@ import {
 
 import EventProvider from "../EventProvider.js";
 import UI5Element from "../UI5Element.js";
+import NavigationMode from "../types/NavigationMode.js";
 
 // navigatable items must have id and tabindex
 class ItemNavigation extends EventProvider {
@@ -19,6 +20,11 @@ class ItemNavigation extends EventProvider {
 		this.rowSize = options.rowSize || 1;
 		this.cyclic = options.cyclic || false;
 
+		const navigationMode = options.navigationMode;
+		const autoNavigation = !navigationMode || navigationMode === NavigationMode.Auto;
+		this.horizontalNavigationOn = autoNavigation || navigationMode === NavigationMode.Horizontal;
+		this.verticalNavigationOn = autoNavigation || navigationMode === NavigationMode.Vertical;
+
 		this.rootWebComponent = rootWebComponent;
 		this.rootWebComponent.addEventListener("keydown", this.onkeydown.bind(this));
 		this.rootWebComponent.addEventListener("_componentStateFinalized", () => {
@@ -32,6 +38,14 @@ class ItemNavigation extends EventProvider {
 		});
 	}
 
+	_horizontalNavigationOn() {
+		return this.horizontalNavigationOn;
+	}
+
+	_verticalNavigationOn() {
+		return this.verticalNavigationOn;
+	}
+
 	_onKeyPress(event) {
 		const items = this._getItems();
 
@@ -59,19 +73,19 @@ class ItemNavigation extends EventProvider {
 	}
 
 	onkeydown(event) {
-		if (isUp(event)) {
+		if (isUp(event) && this._verticalNavigationOn()) {
 			return this._handleUp(event);
 		}
 
-		if (isDown(event)) {
+		if (isDown(event) && this._verticalNavigationOn()) {
 			return this._handleDown(event);
 		}
 
-		if (isLeft(event)) {
+		if (isLeft(event) && this._horizontalNavigationOn()) {
 			return this._handleLeft(event);
 		}
 
-		if (isRight(event)) {
+		if (isRight(event) && this._horizontalNavigationOn()) {
 			return this._handleRight(event);
 		}
 

packages/base/src/types/NavigationMode.js

@@ -0,0 +1,6 @@
+const NavigationMode = {
+	Auto: "Auto",
+	Vertical: "Vertical",
+	Horizontal: "Horizontal",
+};
+export default NavigationMode;

packages/main/src/List.js

@@ -3,6 +3,7 @@ import litRender from "@ui5/webcomponents-base/dist/renderer/LitRenderer.js";
 import ItemNavigation from "@ui5/webcomponents-base/dist/delegate/ItemNavigation.js";
 import { getLastTabbableElement } from "@ui5/webcomponents-base/dist/util/TabbableElements.js";
 import { isTabNext } from "@ui5/webcomponents-base/dist/events/PseudoEvents.js";
+import NavigationMode from "@ui5/webcomponents-base/dist/types/NavigationMode.js";
 import ListMode from "./types/ListMode.js";
 import ListSeparators from "./types/ListSeparators.js";
 import ListItemType from "./types/ListItemType.js";
@@ -259,7 +260,10 @@ class List extends UI5Element {
 	}
 
 	initItemNavigation() {
-		this._itemNavigation = new ItemNavigation(this);
+		this._itemNavigation = new ItemNavigation(this, {
+			navigationMode: NavigationMode.Vertical,
+		});
+
 		this._itemNavigation.getItemsCallback = () => this.getSlottedNodes("items");
 	}
 

packages/main/src/Table.js

@@ -2,6 +2,7 @@ import UI5Element from "@ui5/webcomponents-base/dist/UI5Element.js";
 import litRender from "@ui5/webcomponents-base/dist/renderer/LitRenderer.js";
 import ResizeHandler from "@ui5/webcomponents-base/dist/delegate/ResizeHandler.js";
 import ItemNavigation from "@ui5/webcomponents-base/dist/delegate/ItemNavigation.js";
+import NavigationMode from "@ui5/webcomponents-base/dist/types/NavigationMode.js";
 import TableTemplate from "./generated/templates/TableTemplate.lit.js";
 
 // Styles
@@ -161,7 +162,9 @@ class Table extends UI5Element {
 	constructor() {
 		super();
 
-		this._itemNavigation = new ItemNavigation(this);
+		this._itemNavigation = new ItemNavigation(this, {
+			navigationMode: NavigationMode.Vertical,
+		});
 
 		this._itemNavigation.getItemsCallback = function getItemsCallback() {
 			const columnHeader = this.getColumnHeader();

packages/main/test/pages/ItemNavigation.html

@@ -16,5 +16,12 @@ <h2>Focus does not cycle</h2>
 		<ui5-li id="item1">Option 1</ui5-li>
 		<ui5-li id="item2">Option 2</ui5-li>
 	</ui5-list>
+
+	<h2>Vertical navigation only</h2>
+	<ui5-list>
+		<ui5-li id="item3">Option 2.1</ui5-li>
+		<ui5-li id="item4">Option 2.2</ui5-li>
+		<ui5-li id="item5">Option 2.3</ui5-li>
+	</ui5-list>
 </body>
 </html>

packages/main/test/specs/ItemNavigation.spec.js

@@ -9,14 +9,31 @@ describe("Item Navigation Tests", () => {
 		const firstItem = $("#item1");
 		const secondItem = $("#item2");
 
+		browser.pause(2000);
 		firstItem.click();
-		firstItem.keys("ArrowLeft");
 		firstItem.keys("ArrowUp");
-		assert.strictEqual(firstItem.isFocused(), true, "first item remains focused");
+		assert.strictEqual(firstItem.isFocused(), true, "first item remains focused - border reached.");
 
+		browser.pause(2000);
 		secondItem.click();
-		secondItem.keys("ArrowRight");
 		secondItem.keys("ArrowDown");
-		assert.strictEqual(secondItem.isFocused(), true, "second item remains focused");
+		assert.strictEqual(secondItem.isFocused(), true, "second item remains focused - border reached.");
+	});
+
+
+	it("vertical focus navigation", () => {
+		const firstItem = $("#item3");
+		const secondItem = $("#item4");
+
+		// horizontal navigation is allowed is prevented
+		firstItem.click();
+		firstItem.keys("ArrowRight");
+		assert.strictEqual(firstItem.isFocused(), true, "first item remains focused - horizontal navigation prevented.");
+
+		browser.pause(2000);
+
+		// verical navigation is allowed
+		firstItem.keys("ArrowDown");
+		assert.strictEqual(secondItem.isFocused(), true, "second item is now focused - vertical navigation allowed.");
 	});
 });

packages/main/test/specs/List.spec.js

@@ -143,4 +143,20 @@ describe("Date Picker Tests", () => {
 		itemLink.keys("Tab");
 		assert.strictEqual(itemRadioBtn.isFocused(), true, "the last tabbable element (radio) is focused");
 	});
+
+	it("does not focus next / prev item when right / left arrow is pressed", () => {
+		const firstListItem = $("#country1");
+		const secondListItem = $("#country2");
+
+		firstListItem.click();
+
+		firstListItem.keys("ArrowRight");
+
+		assert.ok(firstListItem.isFocused(), "First item remains focussed");
+		assert.strictEqual(secondListItem.isFocused(), false, "Second list item not should be focused");
+
+		firstListItem.keys("ArrowLeft");
+
+		assert.ok(firstListItem.isFocused(), "First item remains focussed");
+	});
 });