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app.component.ts
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app.component.ts
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import {AfterViewInit, Component, ElementRef, QueryList, ViewChildren} from '@angular/core';
import {gsap, Sine} from 'gsap';
enum Direction {
Left = '-=',
Right = '+='
}
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.scss']
})
export class AppComponent implements AfterViewInit {
public currentAvatarIndex = 1;
public enableCarouselButtons = true;
private readonly inactiveProperties = {
filter: 'grayscale(100%)',
scale: 0.5,
opacity: 0.3
}
@ViewChildren('carouselItem')
private carouselItems : QueryList<ElementRef>;
ngAfterViewInit(): void {
const carouselNativeElements = this.getCarouselElements();
const currentLeftAvatar = carouselNativeElements[0];
const currentRightAvatar = carouselNativeElements[2];
gsap.set([currentLeftAvatar, currentRightAvatar], this.inactiveProperties);
}
public right(): void {
this.slide(Direction.Right);
}
public left(): void {
this.slide(Direction.Right);
}
private slide(direction: Direction): void {
this.enableCarouselButtons = false;
const carouselNativeElements = this.getCarouselElements();
const currentLeftAvatarIndex = this.getPreviousIndex(this.currentAvatarIndex);
const currentRightAvatarIndex = this.getNextIndex(this.currentAvatarIndex);
const currentLeftAvatar = carouselNativeElements[currentLeftAvatarIndex];
const currentCentralAvatar = carouselNativeElements[this.currentAvatarIndex];
const currentRightAvatar = carouselNativeElements[currentRightAvatarIndex];
let moveAcrossBackAvatar;
let moveAcrossBackDirection;
let moveToSideDirection;
let moveToCenterAvatar;
let moveToCenterDirection;
const moveToSideAvatar = currentCentralAvatar;
let nextAvatarIndex;
if (direction === Direction.Right) {
moveAcrossBackAvatar = currentLeftAvatar;
moveAcrossBackDirection = Direction.Right;
moveToSideDirection = Direction.Left;
moveToCenterAvatar = currentRightAvatar;
moveToCenterDirection = Direction.Left;
nextAvatarIndex = currentRightAvatarIndex;
} else {
moveAcrossBackAvatar = currentRightAvatar;
moveAcrossBackDirection = Direction.Left;
moveToSideDirection = Direction.Right;
moveToCenterAvatar = currentLeftAvatar;
moveToCenterDirection = Direction.Right;
nextAvatarIndex = currentLeftAvatarIndex;
}
gsap.timeline({ repeat: 0})
.to([moveToSideAvatar], {
...this.inactiveProperties,
duration: 1,
ease: Sine.easeInOut,
x: moveToSideDirection + '100%'
}).to([moveAcrossBackAvatar], {
...this.inactiveProperties,
delay: -1,
duration: 1,
ease: Sine.easeInOut,
x: moveAcrossBackDirection + '200%'
}).to([moveToCenterAvatar], {
filter: 'none',
scale: 1.0,
opacity: 1.0,
delay: -1,
duration: 1,
ease: Sine.easeInOut,
x: moveToCenterDirection + '100%'
}).eventCallback('onComplete', () => {
this.enableCarouselButtons = true;
this.currentAvatarIndex = nextAvatarIndex;
});
}
private getNextIndex(index: number): number {
return ((index + 1) % this.carouselItems.length);
}
private getPreviousIndex(index: number) {
return ((index + this.carouselItems.length - 1)
% this.carouselItems.length);
}
private getCarouselElements(): any[] {
return this.carouselItems.toArray().map(el => el.nativeElement)
}
}