import {
AfterViewInit,
ChangeDetectorRef,
Component,
ContentChildren,
ElementRef, EventEmitter,
Input, OnDestroy, Output,
QueryList,
ViewChild,
Inject,
PLATFORM_ID
} from "@angular/core";
import {SliderTabComponent} from "./slider-tab.component";
import {ActivatedRoute, Router} from "@angular/router";
import {Subscription} from "rxjs";
import {isPlatformServer} from "@angular/common";
import Timeout = NodeJS.Timeout;
declare var UIkit;
@Component({
selector: 'slider-tabs',
template: `
`,
})
export class SliderTabsComponent implements AfterViewInit, OnDestroy {
/**
* Type of tabs:
* Static = Uikit tabs with @connect class or selector
* Dynamic = Active is defined by tabComponent's active Input
* Scrollable = Active is defined by the active fragment of URL and position of scroll
* */
@Input()
public type: 'static' | 'dynamic' | 'scrollable' = 'static';
/**
* Connect selector in static type. Default: .uk-switcher
* */
@Input()
public connect = '.uk-switcher';
/**
* Threshold between 0.0 to 1.0 for Intersection Observer
* */
@Input()
public scrollThreshold = 0.1;
/**
* Tabs view: Horizontal is the default.
* */
@Input()
public position: 'horizontal' | 'left' | 'right' = 'horizontal';
/**
* Tabs flex position: Left is the default.
* */
@Input()
public flexPosition: 'center' | 'left' | 'right' = 'left';
/**
* Set a class for the container
* */
@Input()
public containerClass: string;
/**
* Set a class above tabs
* */
@Input()
public customClass: string;
/**
* Tabs class
* */
@Input()
public tabsClass: string = 'uk-tab';
@Input()
public border: boolean = true;
@Input()
public arrows: boolean = true;
@ContentChildren(SliderTabComponent) tabs: QueryList;
@ViewChild('sliderElement') sliderElement: ElementRef;
@ViewChild('tabsElement') tabsElement: ElementRef;
private slider;
/**
* Notify regarding new active element
* */
@Output() activeEmitter: EventEmitter = new EventEmitter();
private activeIndex: number = 0;
private subscriptions: any[] = [];
private observer: IntersectionObserver;
private timeout: Timeout;
isServer: boolean;
constructor(private route: ActivatedRoute,
private router: Router,
private cdr: ChangeDetectorRef,
@Inject(PLATFORM_ID) private platform: any) {
this.isServer = isPlatformServer(this.platform);
}
ngAfterViewInit() {
this.initTabs();
this.tabs.changes.subscribe(() => {
this.initTabs();
});
}
public initTabs() {
if (typeof document !== 'undefined' && this.tabs.length > 0) {
setTimeout(() => {
if (this.position === 'horizontal') {
this.slider = UIkit.slider(this.sliderElement.nativeElement, {finite: true});
this.slider.clsActive = 'uk-slider-active';
this.slider.updateActiveClasses();
this.slider.slides.forEach((item, index) => {
if(!this.tabs.get(index).active) {
item.classList.remove('uk-active');
}
});
if (this.type === 'static') {
let tabs = UIkit.switcher(this.tabsElement.nativeElement, {connect: this.connect});
tabs.show(this.activeIndex);
if (this.connect.includes('#')) {
this.scrollToStart();
}
} else if(this.type =='dynamic') {
this.activeIndex = this.tabs.toArray().findIndex(tab => tab.active);
this.slider.show(this.activeIndex);
} else if (this.type === 'scrollable') {
this.scrollable(this.slider);
}
} else {
this.scrollable();
}
});
}
}
private scrollToStart() {
this.subscriptions.push(UIkit.util.on(this.connect, 'shown', (event): void => {
let index = event.detail[0].index();
if (index !== this.activeIndex) {
this.activeIndex = index;
this.router.navigate(['./'], {relativeTo: this.route, fragment: this.connect.replace('#', ''), queryParamsHandling: "merge"});
}
}));
}
private scrollable(slider = null) {
this.activeFragment(this.route.snapshot.fragment, slider);
this.subscriptions.push(this.route.fragment.subscribe(fragment => {
this.activeFragment(fragment, slider);
}));
this.setObserver();
}
private setObserver() {
if (this.observer) {
this.observer.disconnect();
}
this.observer = new IntersectionObserver((entries) => {
entries.forEach(entry => {
if (entry.isIntersecting) {
if (this.timeout) {
clearTimeout(this.timeout);
}
this.timeout = setTimeout(() => {
this.router.navigate(['./'], {
fragment: entry.target.id,
relativeTo: this.route,
state: {disableScroll: true},
queryParamsHandling: 'merge'
});
}, 200);
}
});
}, {threshold: this.scrollThreshold});
this.tabs.forEach(tab => {
let element = document.getElementById(tab.id.toString());
if (element) {
this.observer.observe(element);
}
});
}
public showActive(index) {
this.activeIndex = index;
this.activeEmitter.emit(this.tabs.get(this.activeIndex).id);
if(this.slider) {
this.slider.show(this.activeIndex);
}
}
private activeFragment(fragment, slider) {
let index = 0;
if (fragment) {
index = this.tabs.toArray().findIndex(item => item.id == fragment);
}
if (slider) {
slider.show(index);
}
this.tabs.forEach((tab, i) => {
if (index === i) {
tab.active = true;
this.activeEmitter.emit(tab.id);
} else {
tab.active = false;
}
});
this.cdr.detectChanges();
}
get leftTabs(): SliderTabComponent[] {
return this.tabs.toArray().filter(tab => tab.align === 'left');
}
get rightTabs(): SliderTabComponent[] {
return this.tabs.toArray().filter(tab => tab.align === 'right');
}
ngOnDestroy() {
this.subscriptions.forEach(subscription => {
if (subscription instanceof Subscription) {
subscription.unsubscribe();
} else if (subscription instanceof Function) {
subscription();
}
});
if (this.observer) {
this.observer.disconnect();
}
}
}