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feat (v18): Modernize virtualscroller and expand test #16594

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46 changes: 46 additions & 0 deletions src/app/components/virtualscroller/virtualscroller.spec.ts
Original file line number Diff line number Diff line change
@@ -0,0 +1,46 @@
import { ComponentRef } from '@angular/core';
import { ComponentFixture, TestBed } from '@angular/core/testing';
import { NoopAnimationsModule } from '@angular/platform-browser/animations';
import { VirtualScroller, VirtualScrollerModule } from './virtualscroller';

describe('VirtualScroller', () => {
let virtualScroller: VirtualScroller;
let fixture: ComponentFixture<VirtualScroller>;
let virtualScrollerRef: ComponentRef<VirtualScroller>;

beforeEach(() => {
TestBed.configureTestingModule({
imports: [NoopAnimationsModule, VirtualScrollerModule],
});

fixture = TestBed.createComponent(VirtualScroller);
virtualScroller = fixture.componentInstance;
virtualScrollerRef = fixture.componentRef;
});

it('should render the VirtualScroller with default inputs', () => {
fixture.detectChanges();

const virtualScrollerElement = fixture.nativeElement.querySelector('.p-virtualscroller');
expect(virtualScrollerElement).toBeTruthy();
});

it('should apply the correct style and styleClass', () => {
virtualScrollerRef.setInput('style', { 'max-height': '500px' });
virtualScrollerRef.setInput('styleClass', 'custom-class');
fixture.detectChanges();

const virtualScrollerElement = fixture.nativeElement.querySelector('.p-virtualscroller');
expect(virtualScrollerElement.style.maxHeight).toBe('500px');
expect(virtualScrollerElement.classList).toContain('custom-class');
});

it('should scroll to the specified index', () => {
spyOn(virtualScroller.scroller(), 'scrollToIndex');

virtualScroller.scrollToIndex(10);
fixture.detectChanges();

expect(virtualScroller.scroller().scrollToIndex).toHaveBeenCalledWith(10, undefined);
});
});
139 changes: 62 additions & 77 deletions src/app/components/virtualscroller/virtualscroller.ts
Original file line number Diff line number Diff line change
@@ -1,22 +1,23 @@
import { CommonModule } from '@angular/common';
import { NgClass, NgStyle, NgTemplateOutlet } from '@angular/common';
import {
AfterContentInit,
ChangeDetectionStrategy,
ChangeDetectorRef,
Component,
ContentChild,
ContentChildren,
contentChild,
contentChildren,
ElementRef,
EventEmitter,
Input,
OutputEmitterRef,
input,
NgModule,
Output,
QueryList,
output,
Signal,
TemplateRef,
ViewChild,
viewChild,
ViewEncapsulation,
booleanAttribute,
numberAttribute,
computed,
inject,
} from '@angular/core';
import { BlockableUI, Footer, Header, PrimeTemplate, ScrollerOptions, SharedModule } from 'primeng/api';
import { Scroller } from 'primeng/scroller';
Expand All @@ -31,143 +32,127 @@ import { VirtualScrollerLazyLoadEvent } from './virtualscroller.interface';
template: `
<div
[ngClass]="'p-virtualscroller p-component'"
[ngStyle]="style"
[class]="styleClass"
[ngStyle]="style()"
[class]="styleClass()"
[attr.data-pc-name]="'virtualscroller'"
[attr.data-pc-section]="'root'"
>
<div class="p-virtualscroller-header" *ngIf="header || headerTemplate">
<ng-content select="p-header"></ng-content>
<ng-container *ngTemplateOutlet="headerTemplate"></ng-container>
</div>
@if (header() || headerTemplate()) {
<div class="p-virtualscroller-header">
<ng-content select="p-header"></ng-content>
<ng-container *ngTemplateOutlet="headerTemplate()"></ng-container>
</div>
}
<div #content class="p-virtualscroller-content" [attr.data-pc-section]="'content'">
<p-scroller
#scroller
[items]="value"
[items]="value()"
styleClass="p-virtualscroller-list"
[style]="{ height: scrollHeight }"
[itemSize]="itemSize"
[lazy]="lazy"
[style]="{ height: scrollHeight() }"
[itemSize]="itemSize()"
[lazy]="lazy()"
(onLazyLoad)="onLazyItemLoad($event)"
[options]="options"
[options]="options()"
>
<ng-template #item let-item let-scrollerOptions="options">
<div [ngStyle]="{ height: itemSize + 'px' }" class="p-virtualscroller-item">
<div [ngStyle]="{ height: itemSize() + 'px' }" class="p-virtualscroller-item">
<ng-container
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*ngTemplateOutlet="
item ? itemTemplate : loadingItemTemplate;
item ? itemTemplate() : loadingItemTemplate();
context: { $implicit: item, options: scrollerOptions }
"
></ng-container>
</div>
</ng-template>
</p-scroller>
</div>
<div class="p-virtualscroller-footer" *ngIf="footer || footerTemplate" [attr.data-pc-section]="'footer'">
<ng-content select="p-footer"></ng-content>
<ng-container *ngTemplateOutlet="footerTemplate"></ng-container>
</div>
@if (footer() || footerTemplate()) {
<div class="p-virtualscroller-footer" [attr.data-pc-section]="'footer'">
<ng-content select="p-footer"></ng-content>
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<ng-container *ngTemplateOutlet="footerTemplate()"></ng-container>
</div>
}
</div>
`,
changeDetection: ChangeDetectionStrategy.Default,
encapsulation: ViewEncapsulation.None,
})
export class VirtualScroller implements AfterContentInit, BlockableUI {
export class VirtualScroller implements BlockableUI {
/**
* An array of objects to display.
* @group Props
*/
@Input() value: any[] | undefined;
value = input<any[]>();
/**
* Height of an item in the list.
* @group Props
*/
@Input({ transform: numberAttribute }) itemSize: number | undefined;
itemSize = input<number, any>(undefined, { transform: numberAttribute });
/**
* Inline style of the component.
* @group Props
*/
@Input() style: { [klass: string]: any } | null | undefined;
style = input<{ [klass: string]: any } | null>();
/**
* Style class of the component.
* @group Props
*/
@Input() styleClass: string | undefined;
styleClass = input<string>();
/**
* Max height of the content area in inline mode.
* @group Props
*/
@Input() scrollHeight: any;
scrollHeight = input<any>();
/**
* Defines if data is loaded and interacted with in lazy manner.
* @group Props
*/
@Input({ transform: booleanAttribute }) lazy: boolean | undefined;
lazy = input<boolean, any>(undefined, { transform: booleanAttribute });
/**
* Whether to use the scroller feature. The properties of scroller component can be used like an object in it.
* @group Props
*/
@Input() options: ScrollerOptions | undefined;
options = input<ScrollerOptions>();
/**
* Threshold in milliseconds to delay lazy loading during scrolling.
* @group Props
*/
@Input({ transform: numberAttribute }) delay: number = 250;
delay = input<number, any>(250, { transform: numberAttribute });
/**
* Callback to invoke in lazy mode to load new data.
* @param {VirtualScrollerLazyLoadEvent} event - custom lazy load event.
* @group Emits
*/
@Output() onLazyLoad: EventEmitter<VirtualScrollerLazyLoadEvent> = new EventEmitter<VirtualScrollerLazyLoadEvent>();
onLazyLoad: OutputEmitterRef<VirtualScrollerLazyLoadEvent> = output<VirtualScrollerLazyLoadEvent>();

@ContentChild(Header) header: Header | undefined;
header = contentChild<Header | undefined>(Header);

@ContentChild(Footer) footer: Footer | undefined;
footer = contentChild<Footer | undefined>(Footer);

@ContentChildren(PrimeTemplate) templates: Nullable<QueryList<PrimeTemplate>>;
templates: Signal<readonly PrimeTemplate[]> = contentChildren(PrimeTemplate);

@ViewChild('scroller') scroller: Nullable<Scroller>;
scroller = viewChild<Nullable<Scroller>>('scroller');

itemTemplate: Nullable<TemplateRef<any>>;
itemTemplate = computed<Nullable<TemplateRef<any>>>(() => this.mappedTemplates()['item']);

headerTemplate: Nullable<TemplateRef<any>>;
headerTemplate = computed<Nullable<TemplateRef<any>>>(() => this.mappedTemplates()['header']);

footerTemplate: Nullable<TemplateRef<any>>;
footerTemplate = computed<Nullable<TemplateRef<any>>>(() => this.mappedTemplates()['footer']);

loadingItemTemplate: Nullable<TemplateRef<any>>;
loadingItemTemplate = computed<Nullable<TemplateRef<any>>>(() => this.mappedTemplates()['loadingItem']);

virtualScrollTimeout: any;

constructor(
public el: ElementRef,
public cd: ChangeDetectorRef,
) {}

ngAfterContentInit() {
(this.templates as QueryList<PrimeTemplate>).forEach((item) => {
switch (item.getType()) {
case 'item':
this.itemTemplate = item.template;
break;

case 'loadingItem':
this.loadingItemTemplate = item.template;
break;

case 'header':
this.headerTemplate = item.template;
break;

case 'footer':
this.footerTemplate = item.template;
break;

default:
this.itemTemplate = item.template;
break;
}
});
}
private mappedTemplates = computed<{ [key: string]: TemplateRef<any> }>(() => {
return (this.templates() || []).reduce((prev, item) => {
prev[item.getType()] = item.template;
return prev;
}, {});
});

el = inject(ElementRef);

cd = inject(ChangeDetectorRef);

onLazyItemLoad(event: VirtualScrollerLazyLoadEvent) {
if (this.virtualScrollTimeout) {
Expand All @@ -180,20 +165,20 @@ export class VirtualScroller implements AfterContentInit, BlockableUI {
rows: <number>event.last - <number>event.first,
forceUpdate: () => this.cd.detectChanges(),
});
}, this.delay);
}, this.delay());
}

getBlockableElement(): HTMLElement {
return this.el.nativeElement.children[0];
}

scrollToIndex(index: number, mode?: ScrollBehavior): void {
this.scroller?.scrollToIndex(index, mode);
this.scroller()?.scrollToIndex(index, mode);
}
}

@NgModule({
imports: [CommonModule, SharedModule, Scroller],
imports: [NgClass, NgStyle, NgTemplateOutlet, SharedModule, Scroller],
exports: [VirtualScroller, SharedModule, Scroller],
declarations: [VirtualScroller],
})
Expand Down
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