openstapps/frontend/app/src/app/modules/dashboard/dashboard-collapse.ts

/*
 * Copyright (C) 2022 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */

import {Animation, AnimationController} from '@ionic/angular/standalone';
import {NgZone} from '@angular/core';

export class DashboardCollapse {
  collapseAnimation: Animation;

  nextFrame: number;

  setReady: () => void;

  // eslint-disable-next-line unicorn/consistent-function-scoping
  ready = new Promise<void>(resolve => (this.setReady = resolve));

  set active(value: boolean) {
    this.zone.runOutsideAngular(() => {
      if (value) {
        this.start();
      } else {
        this.stop();
      }
    });
  }

  constructor(
    private animationControl: AnimationController,
    private zone: NgZone,
    private scrollContainer: HTMLElement,
    toolbar: HTMLElement,
    schedule: HTMLElement,
  ) {
    this.zone
      .runOutsideAngular(async () => {
        this.collapseAnimation = this.animationControl
          .create()
          .duration(1000)
          .addAnimation([
            this.animationControl
              .create()
              .addElement(toolbar)
              .fromTo('transform', 'translateY(0)', 'translateY(-32px)'),
            this.animationControl
              .create()
              // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
              .addElement(toolbar.querySelector(':scope > div > ion-img')!)
              .fromTo('transform', 'scale(1)', 'scale(0.35)'),
            this.animationControl
              .create()
              .addElement(schedule)
              .fromTo('transform', 'translateY(0) scaleY(1)', 'translateY(-75px) scaleY(0.8)'),
            this.animationControl
              .create()
              .addElement(schedule.querySelectorAll(':scope > a > *'))
              .fromTo('transform', 'scaleY(1)', `scaleY(${1 / 0.8})`),
          ]);
        this.start();
        this.setReady();
      })
      .then();
  }

  private start() {
    this.collapseAnimation.progressStart(true, this.scrollContainer.scrollTop / 172);
    let pos = this.scrollContainer.scrollTop;
    const animate = () => {
      if (pos !== this.scrollContainer.scrollTop) {
        pos = this.scrollContainer.scrollTop;
        this.collapseAnimation.progressStep(this.scrollContainer.scrollTop / 172);
      }
      this.nextFrame = requestAnimationFrame(animate);
    };
    this.nextFrame = requestAnimationFrame(animate);
  }

  private stop() {
    cancelAnimationFrame(this.nextFrame);
    this.collapseAnimation.progressEnd(0, 0, 0);
  }

  destroy() {
    this.stop();
    this.collapseAnimation.destroy();
  }
}