d9ae709b-3c27-4b69-b125-b8b80b54f90b

import { Platform } from '@angular/cdk/platform';
import {
    AfterViewInit,
    ChangeDetectionStrategy,
    ChangeDetectorRef,
    Component,
    ElementRef,
    EventEmitter,
    Inject,
    Input,
    NgZone,
    OnChanges,
    OnDestroy,
    Output,
    Renderer2,
    SimpleChanges,
    ViewChild,
    ViewEncapsulation
} from '@angular/core';
import { fromEvent, Subject } from 'rxjs';
import { takeUntil, throttleTime } from 'rxjs/operators';

import { ThyAnchorLinkComponent } from './anchor-link.component';
import { getOffset } from 'ngx-tethys/util';
import { InputBoolean, InputNumber, ThyScrollService } from 'ngx-tethys/core';
import { DOCUMENT, NgIf, NgTemplateOutlet, NgStyle } from '@angular/common';
import { ThyAffixComponent } from 'ngx-tethys/affix';

interface Section {
    linkComponent: ThyAnchorLinkComponent;
    top: number;
}

const sharpMatcherRegx = /#([^#]+)$/;

/**
 * 锚点组件
 * @name thy-anchor
 */
@Component({
    selector: 'thy-anchor',
    exportAs: 'thyAnchor',
    preserveWhitespaces: false,
    template: `
        <thy-affix *ngIf="thyAffix; else content" [thyOffsetTop]="thyOffsetTop" [thyContainer]="container">
            <ng-template [ngTemplateOutlet]="content"></ng-template>
        </thy-affix>
        <ng-template #content>
            <div class="thy-anchor-wrapper" [ngStyle]="wrapperStyle">
                <div class="thy-anchor">
                    <div class="thy-anchor-ink">
                        <div class="thy-anchor-ink-full" #ink></div>
                    </div>
                    <ng-content></ng-content>
                </div>
            </div>
        </ng-template>
    `,
    encapsulation: ViewEncapsulation.None,
    changeDetection: ChangeDetectionStrategy.OnPush,
    standalone: true,
    imports: [NgIf, ThyAffixComponent, NgTemplateOutlet, NgStyle]
})
export class ThyAnchorComponent implements OnDestroy, AfterViewInit, OnChanges {
    @ViewChild('ink') private ink!: ElementRef;

    /**
     * 固定模式
     */
    @Input() @InputBoolean() thyAffix = true;

    /**
     * 锚点区域边界，单位：px
     */
    @Input()
    @InputNumber()
    thyBounds = 5;

    /**
     * 缓冲的偏移量阈值
     */
    @Input()
    @InputNumber()
    thyOffsetTop?: number = undefined;

    /**
     * 指定滚动的容器
     * @type string | HTMLElement
     */
    @Input() thyContainer?: string | HTMLElement;

    /**
     * 点击项触发
     */
    @Output() readonly thyClick = new EventEmitter<ThyAnchorLinkComponent>();

    /**
     * 滚动到某锚点时触发
     */
    @Output() readonly thyScroll = new EventEmitter<ThyAnchorLinkComponent>();

    visible = false;

    wrapperStyle = { 'max-height': '100vh' };

    container?: HTMLElement | Window;

    private links: ThyAnchorLinkComponent[] = [];

    private animating = false;

    private destroy$ = new Subject<void>();

    private handleScrollTimeoutID = -1;

    constructor(
        @Inject(DOCUMENT) private document: any,
        private cdr: ChangeDetectorRef,
        private platform: Platform,
        private zone: NgZone,
        private renderer: Renderer2,
        private scrollService: ThyScrollService
    ) {}

    registerLink(link: ThyAnchorLinkComponent): void {
        this.links.push(link);
    }

    unregisterLink(link: ThyAnchorLinkComponent): void {
        this.links.splice(this.links.indexOf(link), 1);
    }

    private getContainer(): HTMLElement | Window {
        return this.container || window;
    }

    ngAfterViewInit(): void {
        this.registerScrollEvent();
    }

    ngOnDestroy(): void {
        clearTimeout(this.handleScrollTimeoutID);
        this.destroy$.next();
        this.destroy$.complete();
    }

    private registerScrollEvent(): void {
        if (!this.platform.isBrowser) {
            return;
        }
        this.destroy$.next();
        this.zone.runOutsideAngular(() => {
            fromEvent(this.getContainer(), 'scroll', { passive: true })
                .pipe(throttleTime(50), takeUntil(this.destroy$))
                .subscribe(() => this.handleScroll());
        });
        // Browser would maintain the scrolling position when refreshing.
        // So we have to delay calculation in avoid of getting a incorrect result.
        this.handleScrollTimeoutID = setTimeout(() => this.handleScroll());
    }

    handleScroll(): void {
        if (typeof document === 'undefined' || this.animating) {
            return;
        }
        const container: HTMLElement = this.container instanceof HTMLElement ? this.container : this.document;

        const sections: Section[] = [];
        const scope = (this.thyOffsetTop || 0) + this.thyBounds;
        this.links.forEach(linkComponent => {
            const sharpLinkMatch = sharpMatcherRegx.exec(linkComponent.thyHref.toString());
            if (!sharpLinkMatch) {
                return;
            }
            const target = container.querySelector(`#${sharpLinkMatch[1]}`) as HTMLElement;
            if (target) {
                const top = getOffset(target, this.getContainer()).top;
                if (top < scope) {
                    sections.push({
                        top,
                        linkComponent
                    });
                }
            }
        });

        this.visible = !!sections.length;
        if (!this.visible) {
            this.clearActive();
            this.cdr.detectChanges();
        } else {
            const maxSection = sections.reduce((prev, curr) => (curr.top > prev.top ? curr : prev));
            this.handleActive(maxSection.linkComponent);
        }
        this.setVisible();
    }

    private clearActive(): void {
        this.links.forEach(i => {
            i.unsetActive();
        });
    }

    private handleActive(linkComponent: ThyAnchorLinkComponent): void {
        this.clearActive();
        linkComponent.setActive();
        const linkNode = linkComponent.getLinkTitleElement();

        this.ink.nativeElement.style.top = `${linkNode.offsetTop}px`;
        this.ink.nativeElement.style.height = `${linkNode.clientHeight}px`;
        this.visible = true;
        this.setVisible();
        this.thyScroll.emit(linkComponent);
    }

    private setVisible(): void {
        const visible = this.visible;
        const visibleClassname = 'visible';
        if (this.ink) {
            if (visible) {
                this.renderer.addClass(this.ink.nativeElement, visibleClassname);
            } else {
                this.renderer.removeClass(this.ink.nativeElement, visibleClassname);
            }
        }
    }

    handleScrollTo(linkComponent: ThyAnchorLinkComponent): void {
        const container: HTMLElement = this.container instanceof HTMLElement ? this.container : this.document;
        const linkElement: HTMLElement = container.querySelector(linkComponent.thyHref);
        if (!linkElement) {
            return;
        }

        this.animating = true;
        const containerScrollTop = this.scrollService.getScroll(this.getContainer());
        const elementOffsetTop = getOffset(linkElement, this.getContainer()).top;
        const targetScrollTop = containerScrollTop + elementOffsetTop - (this.thyOffsetTop || 0);
        this.scrollService.scrollTo(this.getContainer(), targetScrollTop, undefined, () => {
            this.animating = false;
        });
        this.handleActive(linkComponent);
        this.thyClick.emit(linkComponent);
    }

    ngOnChanges(changes: SimpleChanges): void {
        const { thyOffsetTop, thyContainer } = changes;
        if (thyOffsetTop) {
            this.wrapperStyle = {
                'max-height': `calc(100vh - ${this.thyOffsetTop}px)`
            };
        }
        if (thyContainer && this.thyContainer) {
            const container = this.thyContainer;
            this.container = typeof container === 'string' ? this.document.querySelector(container) : container;
            this.registerScrollEvent();
        }
    }
}

1	import { Platform } from '@angular/cdk/platform';
2	import {
3	AfterViewInit,
4	ChangeDetectionStrategy,
5	ChangeDetectorRef,
6	Component,
7	ElementRef,
8	EventEmitter,
9	Inject,
10	Input,	1✔
11	NgZone,
12	OnChanges,
13	OnDestroy,
14	Output,
15	Renderer2,	1✔
16	SimpleChanges,
17	ViewChild,	×
18	ViewEncapsulation	×
19	} from '@angular/core';	×
20	import { fromEvent, Subject } from 'rxjs';	×
21	import { takeUntil, throttleTime } from 'rxjs/operators';	×
22		×
23	import { ThyAnchorLinkComponent } from './anchor-link.component';	×
24	import { getOffset } from 'ngx-tethys/util';	×
25	import { InputBoolean, InputNumber, ThyScrollService } from 'ngx-tethys/core';	×
26	import { DOCUMENT, NgIf, NgTemplateOutlet, NgStyle } from '@angular/common';	×
27	import { ThyAffixComponent } from 'ngx-tethys/affix';	×
28		×
29	interface Section {	×
30	linkComponent: ThyAnchorLinkComponent;	×
31	top: number;	×
32	}	×
33		×
34	const sharpMatcherRegx = /#([^#]+)$/;
35
36	/**	×
37	* 锚点组件
38	* @name thy-anchor
39	*/	×
40	@Component({
41	selector: 'thy-anchor',
42	exportAs: 'thyAnchor',	×
43	preserveWhitespaces: false,
44	template: `
45	<thy-affix *ngIf="thyAffix; else content" [thyOffsetTop]="thyOffsetTop" [thyContainer]="container">	×
46	<ng-template [ngTemplateOutlet]="content"></ng-template>
47	</thy-affix>
48	<ng-template #content>	×
49	<div class="thy-anchor-wrapper" [ngStyle]="wrapperStyle">	×
50	<div class="thy-anchor">	×
51	<div class="thy-anchor-ink">
52	<div class="thy-anchor-ink-full" #ink></div>
53	</div>	×
54	<ng-content></ng-content>	×
55	</div>
56	</div>	×
57	</ng-template>	×
58	`,	×
59	encapsulation: ViewEncapsulation.None,
60	changeDetection: ChangeDetectionStrategy.OnPush,	×
61	standalone: true,
62	imports: [NgIf, ThyAffixComponent, NgTemplateOutlet, NgStyle]
63	})
64	export class ThyAnchorComponent implements OnDestroy, AfterViewInit, OnChanges {	×
65	@ViewChild('ink') private ink!: ElementRef;
66
67	/**	×
68	* 固定模式	×
69	*/
70	@Input() @InputBoolean() thyAffix = true;	×
71		×
72	/**	×
73	* 锚点区域边界，单位：px	×
74	*/	×
75	@Input()	×
76	@InputNumber()	×
77	thyBounds = 5;
78		×
79	/**	×
80	* 缓冲的偏移量阈值	×
81	*/	×
82	@Input()	×
83	@InputNumber()
84	thyOffsetTop?: number = undefined;
85
86	/**
87	* 指定滚动的容器
88	* @type string \| HTMLElement
89	*/	×
90	@Input() thyContainer?: string \| HTMLElement;	×
91		×
92	/**	×
93	* 点击项触发
94	*/
95	@Output() readonly thyClick = new EventEmitter<ThyAnchorLinkComponent>();	×
96		×
97	/**
98	* 滚动到某锚点时触发	×
99	*/
100	@Output() readonly thyScroll = new EventEmitter<ThyAnchorLinkComponent>();
101		×
102	visible = false;	×
103
104	wrapperStyle = { 'max-height': '100vh' };
105
106	container?: HTMLElement \| Window;	×
107		×
108	private links: ThyAnchorLinkComponent[] = [];	×
109		×
110	private animating = false;	×
111		×
112	private destroy$ = new Subject<void>();	×
113		×
114	private handleScrollTimeoutID = -1;
115
116	constructor(	×
117	@Inject(DOCUMENT) private document: any,	×
118	private cdr: ChangeDetectorRef,	×
119	private platform: Platform,	×
120	private zone: NgZone,	×
121	private renderer: Renderer2,
122	private scrollService: ThyScrollService
123	) {}	×
124
125	registerLink(link: ThyAnchorLinkComponent): void {
126	this.links.push(link);
127	}
128		×
129	unregisterLink(link: ThyAnchorLinkComponent): void {	×
130	this.links.splice(this.links.indexOf(link), 1);	×
131	}	×
132
133	private getContainer(): HTMLElement \| Window {	×
134	return this.container \|\| window;	×
135	}	×
136		×
137	ngAfterViewInit(): void {	×
138	this.registerScrollEvent();	×
139	}
140		×
141	ngOnDestroy(): void {	×
142	clearTimeout(this.handleScrollTimeoutID);
143	this.destroy$.next();
144	this.destroy$.complete();	×
145	}	×
146		×
147	private registerScrollEvent(): void {
148	if (!this.platform.isBrowser) {
149	return;
150	}	×
151	this.destroy$.next();	×
152	this.zone.runOutsideAngular(() => {	×
153	fromEvent(this.getContainer(), 'scroll', { passive: true })	×
154	.pipe(throttleTime(50), takeUntil(this.destroy$))
155	.subscribe(() => this.handleScroll());
156	});	1✔
157	// Browser would maintain the scrolling position when refreshing.
158	// So we have to delay calculation in avoid of getting a incorrect result.
159	this.handleScrollTimeoutID = setTimeout(() => this.handleScroll());
160	}
161
162	handleScroll(): void {
163	if (typeof document === 'undefined' \|\| this.animating) {
164	return;	1✔
165	}
166	const container: HTMLElement = this.container instanceof HTMLElement ? this.container : this.document;
167
168	const sections: Section[] = [];
169	const scope = (this.thyOffsetTop \|\| 0) + this.thyBounds;
170	this.links.forEach(linkComponent => {
171	const sharpLinkMatch = sharpMatcherRegx.exec(linkComponent.thyHref.toString());
172	if (!sharpLinkMatch) {
173	return;
174	}	1✔
175	const target = container.querySelector(`#${sharpLinkMatch[1]}`) as HTMLElement;
176	if (target) {
177	const top = getOffset(target, this.getContainer()).top;
178	if (top < scope) {	1✔
179	sections.push({
180	top,
181	linkComponent
182	});	1✔
183	}
184	}
185	});
186		1✔
187	this.visible = !!sections.length;
188	if (!this.visible) {
189	this.clearActive();
190	this.cdr.detectChanges();
191	} else {
192	const maxSection = sections.reduce((prev, curr) => (curr.top > prev.top ? curr : prev));
193	this.handleActive(maxSection.linkComponent);
194	}
195	this.setVisible();
196	}
197
198	private clearActive(): void {
199	this.links.forEach(i => {
200	i.unsetActive();
201	});
202	}
203
204	private handleActive(linkComponent: ThyAnchorLinkComponent): void {
205	this.clearActive();
206	linkComponent.setActive();
207	const linkNode = linkComponent.getLinkTitleElement();
208
209	this.ink.nativeElement.style.top = `${linkNode.offsetTop}px`;
210	this.ink.nativeElement.style.height = `${linkNode.clientHeight}px`;
211	this.visible = true;
212	this.setVisible();
213	this.thyScroll.emit(linkComponent);
214	}
215
216	private setVisible(): void {
217	const visible = this.visible;
218	const visibleClassname = 'visible';
219	if (this.ink) {
220	if (visible) {
221	this.renderer.addClass(this.ink.nativeElement, visibleClassname);
222	} else {
223	this.renderer.removeClass(this.ink.nativeElement, visibleClassname);
224	}
225	}
226	}
227
228	handleScrollTo(linkComponent: ThyAnchorLinkComponent): void {
229	const container: HTMLElement = this.container instanceof HTMLElement ? this.container : this.document;
230	const linkElement: HTMLElement = container.querySelector(linkComponent.thyHref);
231	if (!linkElement) {
232	return;
233	}
234
235	this.animating = true;
236	const containerScrollTop = this.scrollService.getScroll(this.getContainer());
237	const elementOffsetTop = getOffset(linkElement, this.getContainer()).top;
238	const targetScrollTop = containerScrollTop + elementOffsetTop - (this.thyOffsetTop \|\| 0);
239	this.scrollService.scrollTo(this.getContainer(), targetScrollTop, undefined, () => {
240	this.animating = false;
241	});
242	this.handleActive(linkComponent);
243	this.thyClick.emit(linkComponent);
244	}
245
246	ngOnChanges(changes: SimpleChanges): void {
247	const { thyOffsetTop, thyContainer } = changes;
248	if (thyOffsetTop) {
249	this.wrapperStyle = {
250	'max-height': `calc(100vh - ${this.thyOffsetTop}px)`
251	};
252	}
253	if (thyContainer && this.thyContainer) {
254	const container = this.thyContainer;
255	this.container = typeof container === 'string' ? this.document.querySelector(container) : container;
256	this.registerScrollEvent();
257	}
258	}
259	}

atinc / ngx-tethys / d9ae709b-3c27-4b69-b125-b8b80b54f90b

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