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import { AfterViewInit, Component, ElementRef, ViewChild, ViewChildren } from '@angular/core';
import { StepperSelectionEvent } from '@angular/cdk/stepper';
import { MatStepper } from '@angular/material/stepper';
import Shared from 'src/app/Shared';
@Component({
selector: 'app-experiment',
templateUrl: './experiment.component.html',
styleUrls: ['./experiment.component.css']
})
export class ExperimentComponent implements AfterViewInit {
@ViewChild(MatStepper) stepper!: MatStepper;
@ViewChild('stepsContainer') stepsContainer!: ElementRef;
@ViewChildren('steps') steps!: ElementRef[];
event: number = 0;
constructor() { }
stepHeight = this.calcStepHeight();
calcStepHeight() {
return window.innerHeight - 64;
}
ngAfterViewInit(): void {
window.addEventListener('resize', () => {
this.updatePageHeight();
})
this.updatePageHeight();
setInterval(() => {
this.updatePageIfScrolled();
}, 100);
this.stepsContainer.nativeElement.addEventListener('scroll', (event: Event) => {
Shared.emitBGScrollEvent(this.stepsContainer.nativeElement.scrollTop);
});
}
updatePageIfScrolled() {
if (this.scrolling) return;
const currentPage = Math.round(this.stepsContainer.nativeElement.scrollTop / this.stepHeight)
this.stepper.selectedIndex = currentPage;
}
updatePageHeight() {
this.stepHeight = this.calcStepHeight();
const stepHeight = `${this.stepHeight}px`;
this.stepsContainer.nativeElement.style.minHeight = stepHeight;
this.steps.forEach(step => {
step.nativeElement.style.minHeight = stepHeight;
})
}
changePage(event: StepperSelectionEvent) {
this.updatePage(<number>event.selectedIndex)
}
goToPage(pageNum: number) {
this.stepper.selectedIndex = pageNum;
this.updatePage(pageNum);
}
scrollTimeout: any;
updatePage(pageNum: number) {
this.scrolling = true;
this.event = pageNum;
let scrollAmount = 0;
this.steps.forEach((step, index) => {
if (index == pageNum) {
scrollAmount = step.nativeElement.offsetTop;
}
})
clearTimeout(this.scrollTimeout);
this.scrollTimeout = setTimeout(() => {
this.scrolling = false;
}, 800);
this.stepsContainer.nativeElement.scroll({
top: scrollAmount,
behavior: 'smooth' //auto, smooth, initial, inherit
});
}
scrolling: boolean = false;
}
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