| 16 | shadow: true, |
| 17 | }) |
| 18 | export class Tabs implements NavOutlet { |
| 19 | private transitioning = false; |
| 20 | private leavingTab?: HTMLIonTabElement; |
| 21 | |
| 22 | @Element() el!: HTMLIonTabsElement; |
| 23 | |
| 24 | @State() selectedTab?: HTMLIonTabElement; |
| 25 | |
| 26 | /** @internal */ |
| 27 | @Prop({ mutable: true }) useRouter = false; |
| 28 | |
| 29 | /** |
| 30 | * Emitted when the navigation will load a component. |
| 31 | * @internal |
| 32 | */ |
| 33 | @Event() ionNavWillLoad!: EventEmitter<void>; |
| 34 | |
| 35 | /** |
| 36 | * Emitted when the navigation is about to transition to a new component. |
| 37 | */ |
| 38 | @Event({ bubbles: false }) ionTabsWillChange!: EventEmitter<{ tab: string }>; |
| 39 | |
| 40 | /** |
| 41 | * Emitted when the navigation has finished transitioning to a new component. |
| 42 | */ |
| 43 | @Event({ bubbles: false }) ionTabsDidChange!: EventEmitter<{ tab: string }>; |
| 44 | |
| 45 | async componentWillLoad() { |
| 46 | if (!this.useRouter) { |
| 47 | /** |
| 48 | * JavaScript and StencilJS use `ion-router`, while |
| 49 | * the other frameworks use `ion-router-outlet`. |
| 50 | * |
| 51 | * If either component is present then tabs will not use |
| 52 | * a basic tab-based navigation. It will use the history |
| 53 | * stack or URL updates associated with the router. |
| 54 | */ |
| 55 | this.useRouter = |
| 56 | (!!this.el.querySelector('ion-router-outlet') || !!document.querySelector('ion-router')) && |
| 57 | !this.el.closest('[no-router]'); |
| 58 | } |
| 59 | if (!this.useRouter) { |
| 60 | const tabs = this.tabs; |
| 61 | if (tabs.length > 0) { |
| 62 | await this.select(tabs[0]); |
| 63 | } |
| 64 | } |
| 65 | this.ionNavWillLoad.emit(); |
| 66 | } |
| 67 | |
| 68 | componentDidLoad() { |
| 69 | this.updateTabBar(); |
| 70 | } |
| 71 | |
| 72 | componentDidUpdate() { |
| 73 | this.updateTabBar(); |
| 74 | } |
| 75 | |