feat(tabs): Tabs used as navigation

Author: youda97

src/tabs/tab.component.ts

@@ -66,7 +66,7 @@ let nextId = 0;
 	selector: "ibm-tab",
 	template: `
 		<div
-			tabIndex="0"
+			[tabindex]="tabIndex"
 			role="tabpanel"
 			*ngIf="shouldRender()"
 			[ngStyle]="{'display': active ? null : 'none'}"
@@ -79,55 +79,48 @@ export class Tab implements OnInit {
 	/**
 	 * Boolean value reflects if the `Tab` is using a custom template for the heading.
 	 * Default value is false.
-	 * @memberof Tab
 	 */
 	public headingIsTemplate = false;
 
 	/**
 	 * The `Tab`'s title to be displayed or custom temaplate for the `Tab` heading.
 	 * @type {(string | TemplateRef<any>)}
-	 * @memberof Tab
 	 */
 	@Input() heading: string | TemplateRef<any>;
 	/**
 	 * Indicates whether the `Tab` is active/selected.
 	 * Determines whether it's `TabPanel` is rendered.
-	 * @memberof Tab
 	 */
 	@Input() active = false;
 	/**
 	 * Indicates whether or not the `Tab` item is disabled.
-	 * @memberof Tab
 	 */
 	@Input() disabled = false;
+
+	@Input() tabIndex = 0;
 	// do we need id's?
 	/**
 	 * Sets the id of the `Tab`. Will be uniquely generated if not provided.
-	 * @memberof Tab
 	 */
 	@Input() id = `n-tab-${nextId++}`;
 	/**
 	 * Set to true to have Tab items cached and not reloaded on tab switching.
-	 * @memberof Tab
 	 */
 	@Input() cacheActive = false;
 	/**
 	 * Value 'selected' to be emitted after a new `Tab` is selected.
 	 * @type {EventEmitter<void>}
-	 * @memberof Tab
 	 */
 	@Output() selected: EventEmitter<void> = new EventEmitter<void>();
 
 	/**
 	 * Used to set the id property on the element.
-	 * @memberof Tab
 	 */
 	@HostBinding("attr.id") attrClass = this.id;
 
 	/**
 	 * Checks for custom heading template on initialization and updates the value
 	 * of the boolean 'headingIsTemplate'.
-	 * @memberof Tab
 	 */
 	ngOnInit() {
 		if (this.heading instanceof TemplateRef) {
@@ -137,7 +130,6 @@ export class Tab implements OnInit {
 
 	/**
 	 * Emit the status of the `Tab`, specifically 'select' and 'selected' properties.
-	 * @memberof Tab
 	 */
 	doSelect() {
 		this.selected.emit();
@@ -146,7 +138,6 @@ export class Tab implements OnInit {
 	/**
  	* Returns value indicating whether this `Tab` should be rendered in a `TabPanel`.
  	* @returns boolean
- 	* @memberof Tab
  	*/
 	shouldRender() {
 		return this.active || this.cacheActive;

src/tabs/tabs.component.ts

@@ -77,6 +77,10 @@ export class Tabs implements AfterContentInit {
 	 * Set to `true` to put tabs in a loading state.
 	 */
 	@Input() skeleton = false;
+	/**
+	 * Set to `true` to have the tabIndex of the all tabpanels be -1.
+	 */
+	@Input() isNavigation = false;
 
 	/**
 	 * Maintains a `QueryList` of the `Tab` elements and updates if `Tab`s are added or removed.
@@ -98,6 +102,10 @@ export class Tabs implements AfterContentInit {
 		if (this.tabHeaders) {
 			this.tabHeaders.cacheActive = this.cacheActive;
 		}
+
+		this.tabs.forEach(tab => {
+			tab.tabIndex = this.isNavigation ? -1 : 0;
+		});
 	}
 
 	/**

src/tabs/tabs.stories.ts

@@ -16,13 +16,14 @@ storiesOf("Tabs", module)
 	.addDecorator(withKnobs)
 	.add("Basic", () => ({
 		template: `
-			<ibm-tabs [followFocus]="followFocus">
+			<ibm-tabs [followFocus]="followFocus" [isNavigation]="isNavigation">
 				<ibm-tab heading="one">foo</ibm-tab>
 				<ibm-tab heading="two">bar</ibm-tab>
 			</ibm-tabs>
 		`,
 		props: {
-			followFocus: boolean("followFocus", true)
+			followFocus: boolean("followFocus", true),
+			isNavigation: boolean("isNavigation", false)
 		}
 	}))
 	.add("With template", () => ({
@@ -38,12 +39,16 @@ storiesOf("Tabs", module)
 					</svg>
 				</div>
 			</ng-template>
-			<ibm-tabs>
+			<ibm-tabs [followFocus]="followFocus" [isNavigation]="isNavigation">
 				<ibm-tab heading="one">foo</ibm-tab>
 				<ibm-tab heading="two">bar</ibm-tab>
 				<ibm-tab [heading]="customTab">foo</ibm-tab>
 			</ibm-tabs>
-		`
+		`,
+		props: {
+			followFocus: boolean("followFocus", true),
+			isNavigation: boolean("isNavigation", false)
+		}
 	}))
 	.add("Skeleton", () => ({
 		template: `