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153 lines
4.0 KiB
153 lines
4.0 KiB
import { FocusKeyManager } from '@angular/cdk/a11y';
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import { LEFT_ARROW, RIGHT_ARROW, TAB } from '@angular/cdk/keycodes';
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import {
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AfterContentInit,
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CUSTOM_ELEMENTS_SCHEMA,
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ChangeDetectionStrategy,
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Component,
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ContentChildren,
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ElementRef,
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HostBinding,
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Inject,
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Input,
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Optional,
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QueryList,
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ViewChild
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} from '@angular/core';
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import { MatButtonModule } from '@angular/material/button';
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import { ANIMATION_MODULE_TYPE } from '@angular/platform-browser/animations';
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import { CarouselItem } from './carousel-item.directive';
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@Component({
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changeDetection: ChangeDetectionStrategy.OnPush,
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imports: [MatButtonModule],
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schemas: [CUSTOM_ELEMENTS_SCHEMA],
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selector: 'gf-carousel',
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standalone: true,
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styleUrls: ['./carousel.component.scss'],
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templateUrl: './carousel.component.html'
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})
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export class GfCarouselComponent implements AfterContentInit {
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@ContentChildren(CarouselItem) public items!: QueryList<CarouselItem>;
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@HostBinding('class.animations-disabled')
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public readonly animationsDisabled: boolean;
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@Input('aria-label') public ariaLabel: string | undefined;
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@ViewChild('list') public list!: ElementRef<HTMLElement>;
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public showPrevArrow = false;
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public showNextArrow = true;
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private index = 0;
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private keyManager!: FocusKeyManager<CarouselItem>;
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private position = 0;
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public constructor(
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@Optional() @Inject(ANIMATION_MODULE_TYPE) animationsModule?: string
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) {
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this.animationsDisabled = animationsModule === 'NoopAnimations';
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}
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public ngAfterContentInit() {
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this.keyManager = new FocusKeyManager<CarouselItem>(this.items);
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}
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public next() {
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for (let i = this.index; i < this.items.length; i++) {
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if (this.isOutOfView(i)) {
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this.index = i;
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this.scrollToActiveItem();
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break;
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}
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}
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}
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public onKeydown({ keyCode }: KeyboardEvent) {
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const manager = this.keyManager;
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const previousActiveIndex = manager.activeItemIndex;
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if (keyCode === LEFT_ARROW) {
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manager.setPreviousItemActive();
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} else if (keyCode === RIGHT_ARROW) {
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manager.setNextItemActive();
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} else if (keyCode === TAB && !manager.activeItem) {
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manager.setFirstItemActive();
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}
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if (
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manager.activeItemIndex != null &&
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manager.activeItemIndex !== previousActiveIndex
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) {
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this.index = manager.activeItemIndex;
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this.updateItemTabIndices();
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if (this.isOutOfView(this.index)) {
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this.scrollToActiveItem();
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}
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}
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}
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public previous() {
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for (let i = this.index; i > -1; i--) {
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if (this.isOutOfView(i)) {
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this.index = i;
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this.scrollToActiveItem();
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break;
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}
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}
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}
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private isOutOfView(index: number, side?: 'start' | 'end') {
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const { offsetWidth, offsetLeft } =
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this.items.toArray()[index].element.nativeElement;
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if ((!side || side === 'start') && offsetLeft - this.position < 0) {
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return true;
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}
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return (
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(!side || side === 'end') &&
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offsetWidth + offsetLeft - this.position >
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this.list.nativeElement.clientWidth
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);
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}
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private scrollToActiveItem() {
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if (!this.isOutOfView(this.index)) {
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return;
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}
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const itemsArray = this.items.toArray();
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let targetItemIndex = this.index;
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if (this.index > 0 && !this.isOutOfView(this.index - 1)) {
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targetItemIndex =
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itemsArray.findIndex((_, i) => !this.isOutOfView(i)) + 1;
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}
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this.position =
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itemsArray[targetItemIndex].element.nativeElement.offsetLeft;
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this.list.nativeElement.style.transform = `translateX(-${this.position}px)`;
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this.showPrevArrow = this.index > 0;
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this.showNextArrow = false;
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for (let i = itemsArray.length - 1; i > -1; i--) {
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if (this.isOutOfView(i, 'end')) {
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this.showNextArrow = true;
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break;
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}
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}
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}
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private updateItemTabIndices() {
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this.items.forEach((item: CarouselItem) => {
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if (this.keyManager != null) {
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item.tabindex = item === this.keyManager.activeItem ? '0' : '-1';
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}
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});
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}
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}
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