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AfterViewInit,
ChangeDetectorRef,
Component,
ContentChildren,
ElementRef,
HostBinding,
HostListener,
QueryList,
ChangeDetectionStrategy
} from '@angular/core';
import { ReactiveFormsModule } from '@angular/forms';
import { RouterLink } from '@angular/router';
import { defer } from 'lodash-es';
import { ConfigService } from '../../service/config.service';
import { memo, MemoCache } from '../../util/memo';
import { SettingsComponent } from '../settings/settings.component';
@Component({
selector: 'app-tabs',
templateUrl: './tabs.component.html',
styleUrl: './tabs.component.scss',
host: { 'class': 'tabs' },
changeDetection: ChangeDetectionStrategy.Eager,
imports: [ReactiveFormsModule, SettingsComponent]
})
export class TabsComponent implements AfterViewInit {
@ContentChildren(RouterLink)
routerLinks!: QueryList<RouterLink>;
@ContentChildren(RouterLink, { read: ElementRef })
anchors!: QueryList<ElementRef>;
options: string[] = [];
map = new Map<string, number>();
hidden = 0;
@HostBinding('class.measuring')
measuring = true;
private resizeObserver = window.ResizeObserver && new ResizeObserver(() => this.onResize()) || undefined;
constructor(
private config: ConfigService,
private el: ElementRef<HTMLElement>,
private cd: ChangeDetectorRef,
) { }
ngAfterViewInit() {
this.updateTabs();
this.anchors.changes.subscribe(value => {
this.measuring = true;
this.updateTabs();
});
defer(() => this.resizeObserver?.observe(this.el.nativeElement!.parentElement!));
}
@HostBinding('class.floating-tabs')
get floatingTabs() {
return this.config.mini || this.hidden > 0 && this.hidden === this.options.length;
}
@HostListener('window:resize')
onResize() {
if (!this.options.length) return;
defer(() => {
if (!document.body.classList.contains('fullscreen')) {
this.measureVisible();
}
});
}
measureVisible() {
if (!this.options.length) return;
this.hidden = this.options.length - this.visible;
this.hideTabs();
}
updateTabs() {
MemoCache.clear(this);
this.hidden = 0;
this.options = [];
this.map.clear();
const tabs = this.anchors.toArray();
for (const t of tabs) {
const el = t.nativeElement as HTMLAnchorElement;
if (el.tagName !== 'A') continue;
if (el.classList.contains('logo')) continue;
const value = el.title || el.innerText;
this.options.push(value);
this.map.set(value, tabs.indexOf(t));
}
defer(() => this.onResize());
}
hideTabs() {
const tabs = this.anchors.toArray();
let i = this.options.length - 1;
for (const t of tabs) {
const el = t.nativeElement as HTMLAnchorElement;
if (el.tagName !== 'A') continue;
if (el.classList.contains('logo')) continue;
if (el.classList.contains('current-tab')) {
el.style.display = 'inline-block';
} else {
el.style.display = i > this.hidden ? 'inline-block' : 'none';
i--;
}
}
this.measuring = false;
this.cd.markForCheck();
}
@memo
get tabWidths() {
const result: number[] = [];
const tabs = this.anchors.toArray();
for (const t of tabs) {
const el = t.nativeElement as HTMLAnchorElement;
if (el.tagName !== 'A') continue;
if (el.classList.contains('logo')) continue;
result.push(el.offsetWidth + 8.5);
}
return result;
}
get currentTabWidth() {
const el = this.el.nativeElement;
for (let i = 0; i < el.children.length; i++) {
const e = el.children[i] as HTMLElement;
if (!e.classList.contains('current-tab')) continue;
return e.offsetWidth + 8.5;
}
return 0;
}
/**
* Widths of permanent children including the overflow dropdown.
*/
get childWidths() {
const el = this.el.nativeElement;
const result: number[] = [];
let mobileSelect = false;
for (let i = 0; i < el.children.length; i++) {
const e = el.children[i] as HTMLElement;
if (e.tagName === 'A' && !e.classList.contains('logo')) continue;
if (this.config.mobile) {
if (e.tagName === 'H5') continue;
if (e.classList.contains('logo')) continue;
}
if (e.classList.contains('mobile-tab-select')) mobileSelect = true;
result.push(e.offsetWidth + (e.classList.contains('settings') ? 0 : 8));
}
if (!mobileSelect) {
result.push(52);
}
return result;
}
/**
* Number of visible tabs, including the current tab.
*/
get visible() {
const current = this.currentTabWidth;
if (!current) return this.options.length;
if (this.config.mini) return 0;
const el = this.el.nativeElement;
const width = el.offsetWidth - 2;
let result = 1;
let childWidth = current + this.childWidths.reduce((a, b) => a + b);
if (childWidth > width) return 0;
let skipped = false;
for (const w of this.tabWidths) {
if (!skipped && w === current) {
skipped = true;
continue;
}
childWidth += w;
if (childWidth + current < width) {
result++;
} else {
return result;
}
}
return this.options.length;
}
nav(select: HTMLSelectElement) {
if (select.value && this.map.has(select.value)) {
this.routerLinks.get(this.map.get(select.value)!)?.onClick(0, false, false, false, false);
}
select.selectedIndex = 0;
this.measureVisible();
}
}
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