558 lines
16 KiB
TypeScript
558 lines
16 KiB
TypeScript
import { logger, LogLevels } from "../lib/logger";
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import smoothscroll, { SCROLL_TIME, SmoothScrollToOptions } from '../vendor/smoothscroll';
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import { touchSupport } from "../lib/config";
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//import { CancellablePromise, deferredPromise } from "../lib/polyfill";
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//import { isInDOM } from "../lib/utils";
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(window as any).__forceSmoothScrollPolyfill__ = true;
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smoothscroll();
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/*
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var el = $0;
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var height = 0;
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var checkUp = false;
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do {
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height += el.scrollHeight;
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} while(el = (checkUp ? el.previousElementSibling : el.nextElementSibling));
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console.log(height);
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*/
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/*
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Array.from($0.querySelectorAll('.bubble__container')).forEach(_el => {
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//_el.style.display = '';
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//return;
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let el = _el.parentElement;
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let height = el.scrollHeight;
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let width = el.scrollWidth;
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el.style.width = width + 'px';
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el.style.height = height + 'px';
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_el.style.display = 'none';
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});
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*/
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/* const scrollables: Map<HTMLElement, Scrollable> = new Map();
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const scrollsIntersector = new IntersectionObserver(entries => {
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for(let entry of entries) {
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const scrollable = scrollables.get(entry.target as HTMLElement);
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if(entry.isIntersecting) {
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scrollable.isVisible = true;
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} else {
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scrollable.isVisible = false;
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if(!isInDOM(entry.target)) {
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scrollsIntersector.unobserve(scrollable.container);
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scrollables.delete(scrollable.container);
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}
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}
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}
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}); */
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export class ScrollableBase {
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protected log: ReturnType<typeof logger>;
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protected onScroll: () => void;
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public getScrollValue: () => number;
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public scrollLocked = 0;
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constructor(public el: HTMLElement, logPrefix = '', public appendTo = el, public container: HTMLElement = document.createElement('div')) {
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this.container.classList.add('scrollable');
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if(!appendTo) {
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this.appendTo = this.container;
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}
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this.log = logger('SCROLL' + (logPrefix ? '-' + logPrefix : ''), LogLevels.error);
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if(el) {
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Array.from(el.children).forEach(c => this.container.append(c));
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el.append(this.container);
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}
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//this.onScroll();
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}
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protected setListeners() {
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window.addEventListener('resize', this.onScroll);
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this.container.addEventListener('scroll', this.onScroll, {passive: true, capture: true});
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}
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public prepend(element: HTMLElement) {
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this.appendTo.prepend(element);
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}
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public append(element: HTMLElement) {
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this.appendTo.append(element);
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}
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public contains(element: Element) {
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return !!element.parentElement;
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}
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public removeElement(element: Element) {
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element.remove();
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}
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public scrollTo(value: number, side: 'top' | 'left', smooth = true, important = false, scrollTime = SCROLL_TIME) {
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if(this.scrollLocked && !important) return;
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const scrollValue = this.getScrollValue();
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if(scrollValue == Math.floor(value)) {
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return;
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}
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if(this.scrollLocked) clearTimeout(this.scrollLocked);
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/* else {
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this.scrollLockedPromise = deferredPromise<void>();
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} */
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this.scrollLocked = window.setTimeout(() => {
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this.scrollLocked = 0;
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//this.scrollLockedPromise.resolve();
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//this.onScroll();
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this.container.dispatchEvent(new CustomEvent('scroll'));
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}, scrollTime);
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const options: SmoothScrollToOptions = {
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behavior: smooth ? 'smooth' : 'auto',
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scrollTime
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};
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options[side] = value;
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this.container.scrollTo(options as any);
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}
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get length() {
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return this.appendTo.childElementCount;
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}
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}
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export default class Scrollable extends ScrollableBase {
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public splitUp: HTMLElement;
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public onScrolledTop: () => void = null;
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public onScrolledBottom: () => void = null;
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public onScrollMeasure: number = null;
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public lastScrollTop: number = 0;
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private disableHoverTimeout: number = 0;
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/* private sentinelsObserver: IntersectionObserver;
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private topSentinel: HTMLDivElement;
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private bottomSentinel: HTMLDivElement; */
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private observer: IntersectionObserver;
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private visible: Set<HTMLElement>;
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private virtualTempIDTop = 0;
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private virtualTempIDBottom = 0;
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private lastTopID = 0;
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private lastBottomID = 0;
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private lastScrollDirection = 0; // true = bottom
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/* private onScrolledTopFired = false;
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private onScrolledBottomFired = false; */
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//public scrollLockedPromise: CancellablePromise<void> = Promise.resolve();
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public isVisible = false;
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private reorderTimeout: number;
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private setVisible(element: HTMLElement) {
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if(this.visible.has(element)) return;
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this.log.debug('setVisible id:', element.dataset.virtual);
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(element.firstElementChild as HTMLElement).style.display = '';
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this.visible.add(element);
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}
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private setHidden(element: HTMLElement) {
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if(!this.visible.has(element)) return;
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this.log.debug('setHidden id:', element.dataset.virtual);
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(element.firstElementChild as HTMLElement).style.display = 'none';
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this.visible.delete(element);
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}
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constructor(el: HTMLElement, logPrefix = '', appendTo = el, public onScrollOffset = 300, public splitCount = 15, container: HTMLElement = document.createElement('div')) {
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super(el, logPrefix, appendTo, container);
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this.visible = new Set();
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this.observer = new IntersectionObserver(entries => {
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const filtered = entries.filter(entry => entry.isIntersecting);
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//return;
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//this.log('entries:', entries);
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entries.forEach(entry => {
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const target = entry.target as HTMLElement;
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if(entry.isIntersecting) {
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this.setVisible(target);
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this.log.debug('intersection entry:', entry, this.lastTopID, this.lastBottomID);
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} else {
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const id = +target.dataset.virtual;
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const isTop = entry.boundingClientRect.top < 0;
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if(isTop) {
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this.lastTopID = id + 1;
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} else {
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this.lastBottomID = id - 1;
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}
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//this.setHidden(target);
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//this.log('intersection entry setHidden:', entry);
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}
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//this.debug && this.log('intersection entry:', entry, isTop, isBottom, this.lastTopID, this.lastBottomID);
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});
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if(!filtered.length || this.lastScrollDirection === 0) {
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return;
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}
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if(this.lastScrollDirection === 1) { // bottom
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let target = filtered[filtered.length - 1].target as HTMLElement;
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this.lastBottomID = +target.dataset.virtual;
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for(let i = 0; i < this.splitCount; ++i) {
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target = target.nextElementSibling as HTMLElement;
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if(!target) break;
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this.setVisible(target);
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}
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} else {
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let target = filtered[0].target as HTMLElement;
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this.lastTopID = +target.dataset.virtual;
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for(let i = 0; i < this.splitCount; ++i) {
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target = target.previousElementSibling as HTMLElement;
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if(!target) break;
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this.setVisible(target);
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}
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}
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this.log.debug('entries:', entries, filtered, this.lastScrollDirection, this.lastTopID, this.lastBottomID);
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const minVisibleID = this.lastTopID - this.splitCount;
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const maxVisibleID = this.lastBottomID + this.splitCount;
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for(const target of this.visible) {
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const id = +target.dataset.virtual;
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if(id < minVisibleID || id > maxVisibleID) {
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this.setHidden(target);
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}
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}
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});
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this.container.classList.add('scrollable-y');
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//this.onScroll();
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this.setListeners();
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}
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// public attachSentinels(container = this.container, offset = this.onScrollOffset) {
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// if(!this.sentinelsObserver) {
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// this.topSentinel = document.createElement('div');
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// this.topSentinel.classList.add('scrollable-sentinel');
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// this.topSentinel.style.top = offset + 'px';
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// this.bottomSentinel = document.createElement('div');
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// this.bottomSentinel.classList.add('scrollable-sentinel');
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// this.bottomSentinel.style.bottom = offset + 'px';
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// this.container.append(this.topSentinel, this.bottomSentinel);
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// //let fire: () => void;
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// this.sentinelsObserver = new IntersectionObserver(entries => {
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// for(let entry of entries) {
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// let top = entry.target == this.topSentinel;
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// if(top) {
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// this.onScrolledTopFired = entry.isIntersecting;
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// } else {
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// this.onScrolledBottomFired = entry.isIntersecting;
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// }
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// }
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// /* this.debug && */this.log('Set onScrolledFires:', this.onScrolledTopFired, this.onScrolledBottomFired);
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// /* if((this.onScrolledTopFired || this.onScrolledBottomFired) && !fire) {
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// fire = () => window.requestAnimationFrame(() => {
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// if(!this.scrollLocked) {
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// if(this.onScrolledTopFired && this.onScrolledTop) this.onScrolledTop();
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// if(this.onScrolledBottomFired && this.onScrolledBottom) this.onScrolledBottom();
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// }
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// if(!this.onScrolledTopFired && !this.onScrolledBottomFired) {
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// fire = undefined;
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// } else {
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// fire();
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// }
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// });
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// fire();
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// } */
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// });
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// this.sentinelsObserver.observe(this.topSentinel);
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// this.sentinelsObserver.observe(this.bottomSentinel);
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// }
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// container.prepend(this.topSentinel);
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// container.append(this.bottomSentinel);
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// }
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public setVirtualContainer(el?: HTMLElement) {
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this.splitUp = el;
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this.lastScrollTop = 0;
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this.log('setVirtualContainer:', el, this);
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}
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public onScroll = () => {
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/* let scrollTop = this.scrollTop;
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this.lastScrollDirection = this.lastScrollTop < scrollTop;
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this.lastScrollTop = scrollTop;
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return; */
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//if(!this.isVisible) return;
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//if(this.debug) {
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//this.log('onScroll call', this.onScrollMeasure);
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//}
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//let appendTo = this.splitUp || this.appendTo;
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// this.log('onScroll:', this.container.scrollTop);
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// if(this.container.scrollTop <= 0) {
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// /* touchSupport && */(this.container.style.overflow = 'hidden');
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// this.scrollTop = 0;
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// /* touchSupport && */(this.container.style.overflow = '');
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// }
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if(this.splitUp) {
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clearTimeout(this.disableHoverTimeout);
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this.disableHoverTimeout = window.setTimeout(() => {
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//appendTo.classList.remove('disable-hover');
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this.lastScrollDirection = 0;
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}, 100);
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}
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/* if(this.el != this.appendTo && this.appendTo != this.container) {
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if(!appendTo.classList.contains('disable-hover')) {
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appendTo.classList.add('disable-hover');
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}
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} */
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if(this.onScrollMeasure || ((this.scrollLocked || (!this.onScrolledTop && !this.onScrolledBottom)) && !this.splitUp)) return;
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this.onScrollMeasure = window.requestAnimationFrame(() => {
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//if(!this.isVisible) return;
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this.checkForTriggers();
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this.onScrollMeasure = 0;
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if(!this.splitUp) return;
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const scrollTop = this.scrollTop;
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if(this.lastScrollTop != scrollTop) {
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this.lastScrollDirection = this.lastScrollTop < scrollTop ? 1 : -1;
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this.lastScrollTop = scrollTop;
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} else {
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this.lastScrollDirection = 0;
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}
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});
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};
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public checkForTriggers() {
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if(this.scrollLocked || (!this.onScrolledTop && !this.onScrolledBottom)) return;
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const container = this.container;
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const scrollHeight = container.scrollHeight;
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if(!scrollHeight) { // незачем вызывать триггеры если блок пустой или не виден
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return;
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}
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const {clientHeight, scrollTop} = container;
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const maxScrollTop = scrollHeight - clientHeight;
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//this.log('checkForTriggers:', scrollTop, maxScrollTop);
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if(this.onScrolledTop && scrollTop <= this.onScrollOffset) {
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this.onScrolledTop();
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}
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if(this.onScrolledBottom && (maxScrollTop - scrollTop) <= this.onScrollOffset) {
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this.onScrolledBottom();
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}
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}
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public reorder() {
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if(!this.splitUp || this.reorderTimeout) return;
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this.reorderTimeout = window.setTimeout(() => {
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this.reorderTimeout = 0;
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(Array.from(this.splitUp.children) as HTMLElement[]).forEach((el, idx) => {
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el.dataset.virtual = '' + idx;
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});
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}, 0);
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}
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public updateElement(element: HTMLElement) {
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element.style.minHeight = '';
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window.requestAnimationFrame(() => {
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const height = element.scrollHeight;
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window.requestAnimationFrame(() => {
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element.style.minHeight = height + 'px';
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});
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});
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}
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public prepareElement(element: HTMLElement, append = true) {
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if(!this.splitUp) return;
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//return;
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element.dataset.virtual = '' + (append ? this.virtualTempIDBottom++ : this.virtualTempIDTop--);
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this.log.debug('prepareElement: prepared');
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window.requestAnimationFrame(() => {
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const {scrollHeight/* , scrollWidth */} = element;
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this.log.debug('prepareElement: first rAF');
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window.requestAnimationFrame(() => {
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//element.style.height = scrollHeight + 'px';
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element.style.minHeight = scrollHeight + 'px'; // height doesn't work for safari
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//element.style.width = scrollWidth + 'px';
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//(element.firstElementChild as HTMLElement).style.display = 'none';
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});
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this.visible.add(element);
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this.observer.observe(element);
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});
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}
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public prepend(element: HTMLElement, splitable = true) {
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if(splitable) this.prepareElement(element, false);
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if(this.splitUp) this.splitUp.prepend(element);
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else this.appendTo.prepend(element);
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}
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public append(element: HTMLElement, splitable = true) {
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if(splitable) this.prepareElement(element);
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if(this.splitUp) this.splitUp.append(element);
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else this.appendTo.append(element);
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}
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public contains(element: Element) {
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if(!this.splitUp) {
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return this.appendTo.contains(element);
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}
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return !!element.parentElement;
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}
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public scrollIntoView(element: HTMLElement, smooth = true) {
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if(element.parentElement && !this.scrollLocked) {
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const isFirstUnread = element.classList.contains('is-first-unread');
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let offset = element.getBoundingClientRect().top - this.container.getBoundingClientRect().top;
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offset = this.scrollTop + offset;
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if(!smooth && isFirstUnread) {
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this.scrollTo(offset, 'top', false);
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return;
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}
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const clientHeight = this.container.clientHeight;
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const height = element.scrollHeight;
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const d = (clientHeight - height) / 2;
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offset -= d;
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this.scrollTo(offset, 'top', smooth);
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}
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}
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public removeElement(element: Element) {
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element.remove();
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}
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public getScrollValue = () => {
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return this.scrollTop;
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};
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set scrollTop(y: number) {
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this.container.scrollTop = y;
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}
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get scrollTop() {
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//this.log.trace('get scrollTop');
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return this.container.scrollTop;
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}
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get scrollHeight() {
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return this.container.scrollHeight;
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}
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}
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export class ScrollableX extends ScrollableBase {
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constructor(public el: HTMLElement, logPrefix = '', public appendTo = el, public onScrollOffset = 300, public splitCount = 15, public container: HTMLElement = document.createElement('div')) {
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super(el, logPrefix, appendTo, container);
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this.container.classList.add('scrollable-x');
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if(!touchSupport) {
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const scrollHorizontally = (e: any) => {
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e = window.event || e;
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if(e.which == 1) {
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// maybe horizontal scroll is natively supports, works on macbook
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return;
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}
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const delta = Math.max(-1, Math.min(1, (e.wheelDelta || -e.detail)));
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this.container.scrollLeft -= (delta * 20);
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e.preventDefault();
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};
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if(this.container.addEventListener) {
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// IE9, Chrome, Safari, Opera
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this.container.addEventListener("mousewheel", scrollHorizontally, false);
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// Firefox
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this.container.addEventListener("DOMMouseScroll", scrollHorizontally, false);
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} else {
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// IE 6/7/8
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// @ts-ignore
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this.container.attachEvent("onmousewheel", scrollHorizontally);
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}
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}
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this.setListeners();
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}
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public scrollIntoView(element: HTMLElement, smooth = true, scrollTime?: number) {
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if(element.parentElement && !this.scrollLocked) {
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let offset = element.getBoundingClientRect().left - this.container.getBoundingClientRect().left;
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offset = this.getScrollValue() + offset;
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|
|
const clientWidth = this.container.clientWidth;
|
|
const width = element.scrollWidth;
|
|
|
|
const d = (clientWidth - width) / 2;
|
|
offset -= d;
|
|
|
|
this.scrollTo(offset, 'left', smooth, undefined, scrollTime);
|
|
}
|
|
}
|
|
|
|
public getScrollValue = () => {
|
|
return this.container.scrollLeft;
|
|
};
|
|
}
|