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import { cancelEvent } from "../lib/utils";
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import 'fastdom/fastdom.min';
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import FastDom from 'fastdom';
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//import 'fastdom/src/fastdom-strict'; // exclude in production
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import FastDomPromised from 'fastdom/extensions/fastdom-promised';
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import { logger, deferredPromise, CancellablePromise } from "../lib/polyfill";
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//const fastdom = FastDom.extend(FastDomPromised);
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const fastdom = ((window as any).fastdom as typeof FastDom).extend(FastDomPromised);
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//(window as any).fastdom.strict(false);
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setTimeout(() => {
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//(window as any).fastdom.strict(true);
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}, 5e3);
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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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export default class Scrollable {
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public container: HTMLDivElement;
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public thumb: HTMLDivElement;
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public type: string;
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public side: string;
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public translate: string;
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public scrollType: string;
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public scrollSide: string;
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public clientAxis: string;
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public clientSize: string;
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public scrollSize = -1; // it will be scrollHeight
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public size = 0; // it will be outerHeight of container (not scrollHeight)
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public thumbSize = 0;
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public visibleElements: Array<{element: Element, height: number}> = [];
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public hiddenElements: {
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up: Scrollable['visibleElements'],
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down: Scrollable['visibleElements']
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} = {
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up: [],
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down: []
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};
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public paddings = {up: 0, down: 0};
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public paddingTopDiv: HTMLDivElement;
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public paddingBottomDiv: HTMLDivElement;
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public splitUp: HTMLElement;
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public onAddedBottom: () => void = null;
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public onScrolledTop: () => void = null;
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public onScrolledBottom: () => void = null;
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public onScrolledTopFired = false;
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public onScrolledBottomFired = false;
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public topObserver: IntersectionObserver;
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public bottomObserver: IntersectionObserver;
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public splitMeasureTop: Promise<Promise<void>> = null;
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public splitMeasureBottom: Scrollable['splitMeasureTop'] = null;
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public splitMeasureAdd: Promise<void> = null;
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public splitMeasureRemoveBad: Promise<Element> = null;
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public splitMutateTop: Promise<void> = null;
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public splitMutateBottom: Scrollable['splitMutateTop'] = null;
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public splitMutateRemoveBad: Promise<void> = null;
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public splitMutateIntersectionTop: Promise<void> = null;
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public splitMutateIntersectionBottom: Promise<void> = null;
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public getScrollHeightPromises: Array<{
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element: Element,
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task: Promise<any>
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}> = [];
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public onScrollMeasure: number = null;
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public lastScrollTop: number = 0;
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public scrollTopOffset: number = 0;
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private disableHoverTimeout: number = 0;
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private log: ReturnType<typeof logger>;
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private debug = false;
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private measureMutex: CancellablePromise<void>;
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private prependLocked = false;
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private appendLocked = false;
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private prependFragment: DocumentFragment = null;
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private appendFragment: DocumentFragment = null;
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private prependFragmentId = 0;
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private appendFragmentId = 0;
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constructor(public el: HTMLElement, axis: 'y' | 'x' = 'y', public splitOffset = 300, logPrefix = '', public appendTo = el, public onScrollOffset = splitOffset) {
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this.container = 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 : ''));
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this.measureMutex = deferredPromise<void>();
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this.measureMutex.resolve();
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if(axis == 'x') {
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this.container.classList.add('scrollable-x');
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this.type = 'width';
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this.side = 'left';
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this.translate = 'translateX';
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this.scrollType = 'scrollWidth';
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this.scrollSide = 'scrollLeft';
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this.clientAxis = 'clientX';
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this.clientSize = 'clientWidth';
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let scrollHorizontally = (e: any) => {
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e = window.event || e;
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var 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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} else if(axis == 'y') {
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this.container.classList.add('scrollable-y');
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this.type = 'height';
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this.side = 'top';
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this.translate = 'translateY';
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this.scrollType = 'scrollHeight';
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this.scrollSide = 'scrollTop';
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this.clientAxis = 'clientY';
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this.clientSize = 'clientHeight';
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} else {
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throw new Error('no side for scroll');
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}
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this.thumb = document.createElement('div');
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this.thumb.className = 'scrollbar-thumb';
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// @ts-ignore
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this.thumb.style[this.type] = '30px';
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// mouse scroll
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let onMouseMove = (e: MouseEvent) => {
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let rect = this.thumb.getBoundingClientRect();
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let diff: number;
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// @ts-ignore
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diff = e[this.clientAxis] - rect[this.side];
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// @ts-ignore
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this.container[this.scrollSide] += diff * 0.5;
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// console.log('onMouseMove', e, diff);
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cancelEvent(e);
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};
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this.thumb.addEventListener('mousedown', () => {
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window.addEventListener('mousemove', onMouseMove);
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window.addEventListener('mouseup', () => {
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window.removeEventListener('mousemove', onMouseMove);
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}, {once: true});
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});
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//this.container.addEventListener('mouseover', this.resize.bind(this)); // omg
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window.addEventListener('resize', () => {
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setTimeout(() => {
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// @ts-ignore
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this.size = this.container[this.clientSize];
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this.onScroll();
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this.resize();
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}, 0);
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});
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this.paddingTopDiv = document.createElement('div');
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this.paddingTopDiv.classList.add('scroll-padding');
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this.paddingBottomDiv = document.createElement('div');
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this.paddingBottomDiv.classList.add('scroll-padding');
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this.container.addEventListener('scroll', () => this.onScroll(), {passive: true, capture: true});
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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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window.requestAnimationFrame(() => {
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// @ts-ignore
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this.size = this.container[this.clientSize];
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this.resize();
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});
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this.container.parentElement.append(this.thumb);
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}
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public detachTop(fromIndex: number, needHeight = 0, detachAll = false) {
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//if(this.splitMeasureBottom) fastdom.clear(this.splitMeasureBottom);
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if(this.splitMutateBottom) fastdom.clear(this.splitMutateBottom);
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if(this.prependLocked) return;
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//return this.splitMeasureBottom = fastdom.measure(() => {
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return this.splitMutateBottom = fastdom.mutate(() => {
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if(this.prependLocked) return;
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let spliceTo = -1;
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let needToDetachHeight = needHeight;
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for(; fromIndex >= 0; --fromIndex) {
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let child = this.visibleElements[fromIndex];
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if(needHeight > 0) {
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needHeight -= child.height;
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} else {
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needToDetachHeight -= child.height;
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if(spliceTo === -1) {
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spliceTo = fromIndex;
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}
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}
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}
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if((needToDetachHeight > 0 && !detachAll) || spliceTo === -1) return;
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//if(this.splitMutateBottom) fastdom.clear(this.splitMutateBottom);
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//return this.splitMutateBottom = fastdom.mutate(() => {
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let spliced = this.visibleElements.splice(0, spliceTo + 1);
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if(this.debug) {
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this.log('spliced up', spliced);
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}
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spliced.forEach((child, idx) => {
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if(!child.element.parentElement) {
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this.log.error('no child in splitUp (up):', child, child.element, 0, spliceTo + 1, idx, spliced);
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}
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this.paddings.up += child.height;
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this.splitUp.removeChild(child.element);
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});
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this.hiddenElements.up.push(...spliced);
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this.paddingTopDiv.style.height = this.paddings.up + 'px';
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//});
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});
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}
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public detachBottom(fromIndex: number, needHeight = 0, detachAll = false) {
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//if(this.splitMeasureBottom) fastdom.clear(this.splitMeasureBottom);
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if(this.splitMutateBottom) fastdom.clear(this.splitMutateBottom);
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if(this.appendLocked) return;
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//return this.splitMeasureBottom = fastdom.measure(() => {
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return this.splitMutateBottom = fastdom.mutate(() => {
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if(this.appendLocked) return;
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let spliceFrom = -1;
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let spliceTo = 0;
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let needToDetachHeight = needHeight;
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let length = this.visibleElements.length;
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for(; fromIndex < length; ++fromIndex) {
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let child = this.visibleElements[fromIndex];
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if(needHeight > 0) {
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needHeight -= child.height;
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} else {
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needToDetachHeight -= child.height;
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if(spliceFrom === -1) spliceFrom = fromIndex;
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spliceTo = fromIndex;
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}
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}
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if((needToDetachHeight > 0 && !detachAll) || spliceFrom === -1) return;
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//if(this.splitMutateBottom) fastdom.clear(this.splitMutateBottom);
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//return this.splitMutateBottom = fastdom.mutate(() => {
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let spliced = this.visibleElements.splice(spliceFrom, spliceTo - spliceFrom + 1);
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if(this.debug) {
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this.log('spliced down', spliced, spliceFrom, spliceTo - spliceFrom + 1, length);
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}
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spliced.forEach((child, idx) => {
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if(!child.element.parentElement) {
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this.log.error('no child in splitUp (down):', child, child.element, spliceFrom, spliceTo - spliceFrom + 1, idx, spliced);
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}
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this.paddings.down += child.height;
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this.splitUp.removeChild(child.element);
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});
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this.hiddenElements.down.unshift(...spliced);
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this.paddingBottomDiv.style.height = this.paddings.down + 'px';
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//});
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});
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}
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public resize() {
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//console.time('scroll resize');
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//fastdom.mutate(() => {
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if(!this.size || this.size == this.scrollSize) {
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this.thumbSize = 0;
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// @ts-ignore
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this.thumb.style[this.type] = this.thumbSize + 'px';
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//console.timeEnd('scroll resize');
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return;
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}
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//if(!height) return;
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let divider = this.scrollSize / this.size / 0.5;
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this.thumbSize = this.size / divider;
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if(this.thumbSize < 20) this.thumbSize = 20;
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// @ts-ignore
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this.thumb.style[this.type] = this.thumbSize + 'px';
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//});
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//console.timeEnd('scroll resize');
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// @ts-ignore
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//console.log('onresize', thumb.style[type], thumbHeight, height);
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}
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public setVirtualContainer(el?: HTMLElement) {
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this.splitUp = el;
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this.onScrolledBottomFired = this.onScrolledTopFired = false;
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this.hiddenElements.up.length = this.hiddenElements.down.length = this.visibleElements.length = 0;
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this.paddings.up = this.paddings.down = 0;
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this.lastScrollTop = 0;
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this.paddingTopDiv.style.height = '';
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this.paddingBottomDiv.style.height = '';
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this.log('setVirtualContainer:', el, this);
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this.getScrollTopOffset();
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if(el) {
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fastdom.mutate(() => {
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el.parentElement.insertBefore(this.paddingTopDiv, el);
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el.parentNode.insertBefore(this.paddingBottomDiv, el.nextSibling);
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});
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} else {
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this.paddingTopDiv.remove();
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this.paddingBottomDiv.remove();
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}
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}
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get state() {
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return {
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hiddenElements: {
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up: this.hiddenElements.up.slice(),
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down: this.hiddenElements.down.slice(),
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},
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paddings: {
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up: this.paddings.up,
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down: this.paddings.down
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},
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visibleElements: this.visibleElements.slice(),
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scrollSize: this.scrollSize
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};
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}
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set state(state: {
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visibleElements: Scrollable['visibleElements'],
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hiddenElements: Scrollable['hiddenElements'],
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paddings: Scrollable['paddings'],
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|
|
|
scrollSize: Scrollable['scrollSize']
|
|
|
|
}) {
|
|
|
|
this.visibleElements = state.visibleElements;
|
|
|
|
this.hiddenElements = state.hiddenElements;
|
|
|
|
this.paddings = state.paddings;
|
|
|
|
this.scrollSize = state.scrollSize;
|
|
|
|
|
|
|
|
fastdom.mutate(() => {
|
|
|
|
this.paddingTopDiv.style.height = this.paddings.up + 'px';
|
|
|
|
this.paddingBottomDiv.style.height = this.paddings.down + 'px';
|
|
|
|
|
|
|
|
this.onScroll();
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
public getScrollTopOffset() {
|
|
|
|
if(this.splitUp && this.splitUp.parentElement && this.splitUp.parentElement != this.container) { // need to find offset
|
|
|
|
fastdom.measure(() => {
|
|
|
|
let rect = this.splitUp.getBoundingClientRect();
|
|
|
|
let containerRect = this.container.getBoundingClientRect();
|
|
|
|
|
|
|
|
this.scrollTopOffset = rect.top - containerRect.top;
|
|
|
|
this.log('set scrollTopOffset to:', this.scrollTopOffset);
|
|
|
|
});
|
|
|
|
} else {
|
|
|
|
this.scrollTopOffset = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
public onScroll() {
|
|
|
|
//return;
|
|
|
|
if(this.debug) {
|
|
|
|
this.log('onScroll call', this.onScrollMeasure);
|
|
|
|
}
|
|
|
|
|
|
|
|
let appendTo = this.splitUp || this.appendTo;
|
|
|
|
|
|
|
|
clearTimeout(this.disableHoverTimeout);
|
|
|
|
if(this.el != this.appendTo && this.appendTo != this.container) {
|
|
|
|
if(!appendTo.classList.contains('disable-hover')) {
|
|
|
|
appendTo.classList.add('disable-hover');
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
this.disableHoverTimeout = setTimeout(() => {
|
|
|
|
appendTo.classList.remove('disable-hover');
|
|
|
|
|
|
|
|
if(!this.measureMutex.isFulfilled) {
|
|
|
|
this.measureMutex.resolve();
|
|
|
|
}
|
|
|
|
}, 100);
|
|
|
|
|
|
|
|
if(this.onScrollMeasure) return; //window.cancelAnimationFrame(this.onScrollMeasure);
|
|
|
|
this.onScrollMeasure = window.requestAnimationFrame(() => {
|
|
|
|
// @ts-ignore
|
|
|
|
let scrollPos = this.container[this.scrollSide];
|
|
|
|
|
|
|
|
if(this.measureMutex.isFulfilled) {
|
|
|
|
// @ts-ignore quick brown fix
|
|
|
|
this.size = this.container[this.clientSize];
|
|
|
|
|
|
|
|
// @ts-ignore
|
|
|
|
let scrollSize = this.container[this.scrollType];
|
|
|
|
if(scrollSize != this.scrollSize || this.thumbSize == 0) {
|
|
|
|
this.scrollSize = scrollSize;
|
|
|
|
this.resize();
|
|
|
|
} else this.scrollSize = scrollSize;
|
|
|
|
|
|
|
|
this.measureMutex = deferredPromise<void>();
|
|
|
|
}
|
|
|
|
|
|
|
|
// let value = scrollPos / (this.scrollSize - this.size) * 100;
|
|
|
|
// let maxValue = 100 - (this.thumbSize / this.size * 100);
|
|
|
|
let value = scrollPos / (this.scrollSize - this.size) * this.size;
|
|
|
|
let maxValue = this.size - this.thumbSize;
|
|
|
|
|
|
|
|
//this.log(scrollPos, this.scrollSize, this.size, value, scrollPos / (this.scrollSize - this.size) * this.size);
|
|
|
|
|
|
|
|
let scrollTop = scrollPos - this.scrollTopOffset;
|
|
|
|
let maxScrollTop = this.scrollSize - this.scrollTopOffset - this.size;
|
|
|
|
|
|
|
|
// @ts-ignore
|
|
|
|
this.thumb.style.transform = this.translate + '(' + (value >= maxValue ? maxValue : value) + 'px)';
|
|
|
|
|
|
|
|
if(this.onScrolledBottom) {
|
|
|
|
if(!this.hiddenElements.down.length && (maxScrollTop - scrollTop) <= this.onScrollOffset) {
|
|
|
|
//if(!this.onScrolledBottomFired) {
|
|
|
|
this.onScrolledBottomFired = true;
|
|
|
|
this.onScrolledBottom();
|
|
|
|
//}
|
|
|
|
} else {
|
|
|
|
this.onScrolledBottomFired = false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if(this.onScrolledTop) {
|
|
|
|
//this.log('onScrolledTop:', scrollTop, this.onScrollOffset);
|
|
|
|
if(!this.hiddenElements.up.length && scrollTop <= this.onScrollOffset) {
|
|
|
|
if(/* !this.onScrolledTopFired */!this.prependLocked) {
|
|
|
|
this.onScrolledTopFired = true;
|
|
|
|
this.onScrolledTop();
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
this.onScrolledTopFired = false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if(!this.splitUp) {
|
|
|
|
this.onScrollMeasure = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
let perf = performance.now();
|
|
|
|
|
|
|
|
if(scrollTop < 0) scrollTop = 0;
|
|
|
|
else if(scrollTop > maxScrollTop) scrollTop = maxScrollTop;
|
|
|
|
|
|
|
|
let toBottom = scrollTop > this.lastScrollTop;
|
|
|
|
|
|
|
|
let visibleFrom = scrollTop - this.paddings.up;
|
|
|
|
let visibleUntil = visibleFrom + this.size;
|
|
|
|
let sum = 0;
|
|
|
|
|
|
|
|
let firstVisibleElementIndex = -1;
|
|
|
|
let lastVisibleElementIndex = -1;
|
|
|
|
|
|
|
|
let needHeight = this.splitOffset;
|
|
|
|
let length = this.visibleElements.length;
|
|
|
|
this.visibleElements.forEach((child, idx) => {
|
|
|
|
if(sum < visibleUntil && (sum + child.height) >= visibleFrom && firstVisibleElementIndex === -1) { // if any part is in viewport
|
|
|
|
firstVisibleElementIndex = idx;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(sum < visibleUntil && firstVisibleElementIndex !== -1) {
|
|
|
|
lastVisibleElementIndex = idx;
|
|
|
|
}
|
|
|
|
|
|
|
|
sum += child.height;
|
|
|
|
|
|
|
|
//this.log(sum, element);
|
|
|
|
});
|
|
|
|
|
|
|
|
if(lastVisibleElementIndex === -1 && firstVisibleElementIndex !== -1) {
|
|
|
|
lastVisibleElementIndex = firstVisibleElementIndex;
|
|
|
|
}
|
|
|
|
|
|
|
|
// возможно устанавливать прошлый скролл нужно уже после этого промиса, т.к. он может очиститься
|
|
|
|
if(scrollTop == this.lastScrollTop) {
|
|
|
|
if(this.debug) {
|
|
|
|
this.log('onScroll ==', (performance.now() - perf).toFixed(3), length, scrollTop, maxScrollTop, toBottom, firstVisibleElementIndex, lastVisibleElementIndex, visibleFrom, visibleUntil, this.scrollTopOffset, this.scrollSize);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.lastScrollTop = scrollTop;
|
|
|
|
if(firstVisibleElementIndex !== -1) this.detachTop(firstVisibleElementIndex, needHeight);
|
|
|
|
if(lastVisibleElementIndex !== -1) this.detachBottom(lastVisibleElementIndex, needHeight);
|
|
|
|
this.onScrollMeasure = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* {
|
|
|
|
this.log('onScroll', (performance.now() - perf).toFixed(3), length, scrollTop,
|
|
|
|
toBottom, firstVisibleElement, lastVisibleElement, visibleFrom, visibleUntil);
|
|
|
|
return {value, maxValue};
|
|
|
|
} */
|
|
|
|
|
|
|
|
if(toBottom) { // scrolling bottom
|
|
|
|
if(firstVisibleElementIndex !== -1) {
|
|
|
|
if(this.debug) {
|
|
|
|
this.log('will detach top by:', firstVisibleElementIndex, needHeight);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.detachTop(firstVisibleElementIndex, needHeight);
|
|
|
|
|
|
|
|
for(let i = lastVisibleElementIndex + 1; i < length; ++i) {
|
|
|
|
needHeight -= this.visibleElements[i].height;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(needHeight >= this.splitOffset) {
|
|
|
|
//this.detachTop(firstVisibleElementIndex, this.splitOffset);
|
|
|
|
this.onBottomIntersection(needHeight);
|
|
|
|
}
|
|
|
|
} else if(length) { // scrolled manually or safari
|
|
|
|
if(this.debug) {
|
|
|
|
this.log.warn('will detach all of top', length, this.splitUp.childElementCount, maxScrollTop, this.paddings, this.lastScrollTop);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.detachTop(this.visibleElements.length - 1, 0, true).then(() => { // now need to move from one hidden array to another one
|
|
|
|
this.onManualScrollBottom(scrollTop, needHeight);
|
|
|
|
});
|
|
|
|
} else if(this.paddings.down) { // scrolled manually or safari
|
|
|
|
if(this.debug) {
|
|
|
|
this.log.warn('seems manually scrolled bottom', this.paddings.up, this.lastScrollTop);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.onManualScrollBottom(scrollTop, needHeight);
|
|
|
|
}
|
|
|
|
} else { // scrolling top
|
|
|
|
if(lastVisibleElementIndex !== -1) {
|
|
|
|
if(this.debug) {
|
|
|
|
this.log('will detach bottom by:', lastVisibleElementIndex, needHeight);
|
|
|
|
}
|
|
|
|
|
|
|
|
//if((lastVisibleElementIndex + 1) < length) {
|
|
|
|
this.detachBottom(lastVisibleElementIndex, needHeight);
|
|
|
|
//}
|
|
|
|
|
|
|
|
for(let i = firstVisibleElementIndex - 1; i >= 0; --i) {
|
|
|
|
needHeight -= this.visibleElements[i].height;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(needHeight >= this.splitOffset) {
|
|
|
|
//this.detachBottom(lastVisibleElementIndex, this.splitOffset);
|
|
|
|
this.onTopIntersection(needHeight);
|
|
|
|
}
|
|
|
|
} else if(length) { // scrolled manually or safari
|
|
|
|
if(this.debug) {
|
|
|
|
this.log.warn('will detach all of bottom', length, this.splitUp.childElementCount, maxScrollTop, this.paddings, this.lastScrollTop);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.detachBottom(0, 0, true).then(() => { // now need to move from one hidden array to another one
|
|
|
|
this.onManualScrollTop(scrollTop, needHeight, maxScrollTop);
|
|
|
|
});
|
|
|
|
} else if(this.paddings.up) {
|
|
|
|
if(this.debug) {
|
|
|
|
this.log.warn('seems manually scrolled top', this.paddings.down, this.lastScrollTop);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.onManualScrollTop(scrollTop, needHeight, maxScrollTop);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if(this.debug) {
|
|
|
|
this.log('onScroll', (performance.now() - perf).toFixed(3), length, scrollTop, maxScrollTop, toBottom, firstVisibleElementIndex, lastVisibleElementIndex, visibleFrom, visibleUntil, this.scrollTopOffset);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.lastScrollTop = scrollTop;
|
|
|
|
this.onScrollMeasure = 0;
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
public onManualScrollTop(scrollTop: number, needHeight: number, maxScrollTop: number) {
|
|
|
|
//if(this.splitMutateRemoveBad) fastdom.clear(this.splitMutateRemoveBad);
|
|
|
|
this.splitMutateRemoveBad = fastdom.mutate(() => {
|
|
|
|
let h = maxScrollTop - (scrollTop + this.size);
|
|
|
|
|
|
|
|
while(this.paddings.down < h && this.paddings.up) {
|
|
|
|
let child = this.hiddenElements.up.pop();
|
|
|
|
this.hiddenElements.down.unshift(child);
|
|
|
|
this.paddings.down += child.height;
|
|
|
|
this.paddings.up -= child.height;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(this.debug) {
|
|
|
|
this.log.warn('manual scroll top', this, length, this.splitUp.childElementCount, scrollTop, this.paddings.up, h);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.paddingTopDiv.style.height = this.paddings.up + 'px';
|
|
|
|
this.paddingBottomDiv.style.height = this.paddings.down + 'px';
|
|
|
|
|
|
|
|
if(!this.paddings.up) this.onBottomIntersection((this.size * 2) + (needHeight * 2));
|
|
|
|
else this.onTopIntersection((this.size * 2) + (needHeight * 2));
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
public onManualScrollBottom(scrollTop: number, needHeight: number) {
|
|
|
|
//if(this.splitMutateRemoveBad) fastdom.clear(this.splitMutateRemoveBad);
|
|
|
|
this.splitMutateRemoveBad = fastdom.mutate(() => {
|
|
|
|
let h = scrollTop - needHeight;
|
|
|
|
|
|
|
|
while(this.paddings.up < h && this.paddings.down) {
|
|
|
|
let child = this.hiddenElements.down.shift();
|
|
|
|
this.hiddenElements.up.push(child);
|
|
|
|
this.paddings.up += child.height;
|
|
|
|
this.paddings.down -= child.height;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(this.debug) {
|
|
|
|
this.log.warn('manual scroll bottom', this, length, this.splitUp.childElementCount, scrollTop, this.paddings.down, h);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.paddingTopDiv.style.height = this.paddings.up + 'px';
|
|
|
|
this.paddingBottomDiv.style.height = this.paddings.down + 'px';
|
|
|
|
|
|
|
|
if(!this.paddings.down) this.onTopIntersection(this.size + (needHeight * 2));
|
|
|
|
else this.onBottomIntersection(this.size + (needHeight * 2));
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
public onTopIntersection(needHeight: number) {
|
|
|
|
if(this.debug) {
|
|
|
|
this.log('onTopIntersection', needHeight, this);
|
|
|
|
}
|
|
|
|
|
|
|
|
if(this.splitMutateIntersectionBottom) fastdom.clear(this.splitMutateIntersectionBottom);
|
|
|
|
this.splitMutateIntersectionBottom = fastdom.mutate(() => {
|
|
|
|
if(this.hiddenElements.up.length && this.paddings.up) {
|
|
|
|
let fragment = document.createDocumentFragment();
|
|
|
|
while(needHeight > 0 && this.paddings.up) {
|
|
|
|
let child = this.hiddenElements.up.pop();
|
|
|
|
|
|
|
|
// console.log('top returning from hidden', child);
|
|
|
|
|
|
|
|
if(!child) {
|
|
|
|
this.paddings.up = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.visibleElements.unshift(child);
|
|
|
|
fragment.prepend(child.element);
|
|
|
|
|
|
|
|
needHeight -= child.height;
|
|
|
|
this.paddings.up -= child.height;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.splitUp.prepend(fragment);
|
|
|
|
this.paddingTopDiv.style.height = this.paddings.up + 'px';
|
|
|
|
} else {
|
|
|
|
this.paddingTopDiv.style.height = '0px';
|
|
|
|
}
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
public onBottomIntersection(needHeight: number) {
|
|
|
|
if(this.debug) {
|
|
|
|
this.log('onBottomIntersection', needHeight, this);
|
|
|
|
}
|
|
|
|
|
|
|
|
if(this.splitMutateIntersectionBottom) fastdom.clear(this.splitMutateIntersectionBottom);
|
|
|
|
this.splitMutateIntersectionBottom = fastdom.mutate(() => {
|
|
|
|
if(this.hiddenElements.down.length && this.paddings.down) {
|
|
|
|
let fragment = document.createDocumentFragment();
|
|
|
|
while(needHeight > 0 && this.paddings.down) {
|
|
|
|
let child = this.hiddenElements.down.shift();
|
|
|
|
|
|
|
|
if(!child) {
|
|
|
|
this.paddings.down = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.visibleElements.push(child);
|
|
|
|
fragment.appendChild(child.element);
|
|
|
|
|
|
|
|
needHeight -= child.height;
|
|
|
|
this.paddings.down -= child.height;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.splitUp.appendChild(fragment);
|
|
|
|
this.paddingBottomDiv.style.height = this.paddings.down + 'px';
|
|
|
|
|
|
|
|
/* if(this.debug) {
|
|
|
|
this.log('onBottomIntersection append:', fragment, needHeight);
|
|
|
|
} */
|
|
|
|
|
|
|
|
if(this.onAddedBottom) this.onAddedBottom();
|
|
|
|
} else {
|
|
|
|
this.paddingBottomDiv.style.height = '0px';
|
|
|
|
}
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
public prepend(element: HTMLElement) {
|
|
|
|
if(this.splitUp) {
|
|
|
|
this.removeElement(element);
|
|
|
|
|
|
|
|
if(this.hiddenElements.up.length && !this.prependLocked) {
|
|
|
|
this.splitUp.prepend(element);
|
|
|
|
|
|
|
|
let height = element.scrollHeight;
|
|
|
|
this.log('will append element to up hidden', element, height);
|
|
|
|
this.paddings.up += height;
|
|
|
|
this.hiddenElements.up.unshift({
|
|
|
|
element: element,
|
|
|
|
height: height
|
|
|
|
});
|
|
|
|
element.parentElement.removeChild(element);
|
|
|
|
|
|
|
|
this.paddingTopDiv.style.height = this.paddings.up + 'px';
|
|
|
|
this.onScroll();
|
|
|
|
} else {
|
|
|
|
this.splitUp.prepend(element);
|
|
|
|
let el = {element, height: 0};
|
|
|
|
this.visibleElements.unshift(el);
|
|
|
|
|
|
|
|
fastdom.measure(() => {
|
|
|
|
if(!element.parentElement) return;
|
|
|
|
let height = element.scrollHeight;
|
|
|
|
el.height = height;
|
|
|
|
this.scrollSize += height;
|
|
|
|
});
|
|
|
|
this.onScroll();
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
this.appendTo.prepend(element);
|
|
|
|
this.visibleElements.unshift({element, height: 0});
|
|
|
|
//this.onScroll();
|
|
|
|
}
|
|
|
|
|
|
|
|
//this.onScroll();
|
|
|
|
}
|
|
|
|
|
|
|
|
public append(element: HTMLElement) {
|
|
|
|
if(this.splitUp) {
|
|
|
|
this.removeElement(element);
|
|
|
|
|
|
|
|
if(this.hiddenElements.down.length && !this.appendLocked) {
|
|
|
|
fastdom.mutate(() => {
|
|
|
|
this.splitUp.append(element);
|
|
|
|
}).then(() => {
|
|
|
|
return fastdom.measure(() => {
|
|
|
|
let height = element.scrollHeight;
|
|
|
|
this.log('will append element to down hidden', element, height);
|
|
|
|
this.paddings.down += height;
|
|
|
|
this.hiddenElements.down.push({
|
|
|
|
element: element,
|
|
|
|
height: height
|
|
|
|
});
|
|
|
|
});
|
|
|
|
}).then(() => {
|
|
|
|
fastdom.mutate(() => {
|
|
|
|
if(element.parentElement) {
|
|
|
|
element.parentElement.removeChild(element);
|
|
|
|
}
|
|
|
|
|
|
|
|
this.paddingBottomDiv.style.height = this.paddings.down + 'px';
|
|
|
|
|
|
|
|
this.onScroll();
|
|
|
|
});
|
|
|
|
});
|
|
|
|
} else {
|
|
|
|
this.splitUp.append(element);
|
|
|
|
let el = {element, height: 0};
|
|
|
|
this.visibleElements.push(el);
|
|
|
|
|
|
|
|
fastdom.measure(() => {
|
|
|
|
if(!element.parentElement) return;
|
|
|
|
let height = element.scrollHeight;
|
|
|
|
el.height = height;
|
|
|
|
this.scrollSize += height;
|
|
|
|
});
|
|
|
|
this.onScroll();
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
this.appendTo.append(element);
|
|
|
|
this.visibleElements.push({element, height: 0});
|
|
|
|
//this.onScroll();
|
|
|
|
}
|
|
|
|
|
|
|
|
//this.onScroll();
|
|
|
|
}
|
|
|
|
|
|
|
|
public prependByBatch(element: HTMLElement) {
|
|
|
|
let perf = performance.now();
|
|
|
|
let fragment = this.prependFragment ?? (this.prependFragment = document.createDocumentFragment());
|
|
|
|
fragment.prepend(element);
|
|
|
|
|
|
|
|
if(this.prependFragmentId) window.cancelAnimationFrame(this.prependFragmentId);
|
|
|
|
this.prependFragmentId = window.requestAnimationFrame(() => {
|
|
|
|
this.prependFragment = null;
|
|
|
|
this.prependFragmentId = 0;
|
|
|
|
|
|
|
|
for(let length = fragment.childElementCount, i = length - 1; i >= 0; --i) {
|
|
|
|
let element = fragment.children[i];
|
|
|
|
this.visibleElements.unshift({element, height: 0});
|
|
|
|
}
|
|
|
|
|
|
|
|
this.log('prependByBatch perf:', performance.now() - perf, fragment.childElementCount);
|
|
|
|
this.appendTo.prepend(fragment);
|
|
|
|
//this.onScroll();
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
public appendByBatch(element: HTMLElement) {
|
|
|
|
let fragment = this.appendFragment ?? (this.appendFragment = document.createDocumentFragment());
|
|
|
|
fragment.append(element);
|
|
|
|
|
|
|
|
if(this.appendFragmentId) window.cancelAnimationFrame(this.appendFragmentId);
|
|
|
|
this.appendFragmentId = window.requestAnimationFrame(() => {
|
|
|
|
this.appendFragment = null;
|
|
|
|
this.appendFragmentId = 0;
|
|
|
|
|
|
|
|
for(let i = 0, length = fragment.childElementCount; i < length; ++i) {
|
|
|
|
let element = fragment.children[i];
|
|
|
|
this.visibleElements.push({element, height: 0});
|
|
|
|
}
|
|
|
|
|
|
|
|
this.appendTo.append(fragment);
|
|
|
|
//this.onScroll();
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
public contains(element: Element) {
|
|
|
|
if(!this.splitUp) {
|
|
|
|
return this.appendTo.contains(element);
|
|
|
|
}
|
|
|
|
|
|
|
|
return !!element.parentElement || !!this.hiddenElements.up.find(c => c.element == element) || !!this.hiddenElements.down.find(c => c.element == element);
|
|
|
|
}
|
|
|
|
|
|
|
|
public removeElement(element: Element) {
|
|
|
|
if(!this.splitUp) {
|
|
|
|
if(element.parentElement) {
|
|
|
|
element.remove();
|
|
|
|
}
|
|
|
|
|
|
|
|
return;
|
|
|
|
} else {
|
|
|
|
if(this.splitUp.contains(element)) {
|
|
|
|
//fastdom.mutate(() => this.splitUp.removeChild(element));
|
|
|
|
this.splitUp.removeChild(element);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
let child = this.hiddenElements.up.findAndSplice(c => c.element == element);
|
|
|
|
let foundUp = false;
|
|
|
|
if(child) {
|
|
|
|
this.paddings.up -= child.height;
|
|
|
|
foundUp = true;
|
|
|
|
} else {
|
|
|
|
child = this.hiddenElements.down.findAndSplice(c => c.element == element);
|
|
|
|
if(child) {
|
|
|
|
this.paddings.down -= child.height;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if(!child) return;
|
|
|
|
|
|
|
|
//fastdom.mutate(() => {
|
|
|
|
if(foundUp) {
|
|
|
|
this.paddingTopDiv.style.height = this.paddings.up + 'px';
|
|
|
|
} else {
|
|
|
|
this.paddingBottomDiv.style.height = this.paddings.down + 'px';
|
|
|
|
}
|
|
|
|
//});
|
|
|
|
|
|
|
|
return child;
|
|
|
|
}
|
|
|
|
|
|
|
|
public insertBefore(newChild: Element, refChild: Element, height?: number) {
|
|
|
|
this.log('insertBefore', newChild, newChild.textContent, refChild);
|
|
|
|
//return;
|
|
|
|
if(!this.splitUp) {
|
|
|
|
let ret = this.appendTo.insertBefore(newChild, refChild);
|
|
|
|
this.onScroll();
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(this.splitUp) {
|
|
|
|
let index = -1;
|
|
|
|
index = this.hiddenElements.up.findIndex(c => c.element == refChild);
|
|
|
|
|
|
|
|
let child = this.removeElement(newChild);
|
|
|
|
if(child) {
|
|
|
|
height = child.height;
|
|
|
|
} else if(height === undefined) {
|
|
|
|
let p = this.getScrollHeightPromises.find(p => p.element == newChild);
|
|
|
|
if(!p) p = {element: newChild, task: null};
|
|
|
|
else fastdom.clear(p.task);
|
|
|
|
|
|
|
|
let promise: any;
|
|
|
|
|
|
|
|
return p.task = promise = fastdom.mutate(() => {
|
|
|
|
this.splitUp.append(newChild);
|
|
|
|
|
|
|
|
return fastdom.measure(() => {
|
|
|
|
if(p.task != promise) return;
|
|
|
|
|
|
|
|
let height = newChild.scrollHeight;
|
|
|
|
|
|
|
|
return fastdom.mutate(() => {
|
|
|
|
if(p.task != promise || !newChild.parentElement) return;
|
|
|
|
|
|
|
|
this.splitUp.removeChild(newChild);
|
|
|
|
|
|
|
|
this.insertBefore(newChild, refChild, height);
|
|
|
|
|
|
|
|
this.getScrollHeightPromises = this.getScrollHeightPromises.filter(p => p.element != newChild);
|
|
|
|
|
|
|
|
return height;
|
|
|
|
});
|
|
|
|
});
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
if(index !== -1) {
|
|
|
|
this.hiddenElements.up.splice(index, 0, {element: newChild, height: height});
|
|
|
|
this.paddings.up += height;
|
|
|
|
fastdom.mutate(() => {
|
|
|
|
this.paddingTopDiv.style.height = this.paddings.up + 'px';
|
|
|
|
this.onScroll();
|
|
|
|
});
|
|
|
|
return index;
|
|
|
|
} else {
|
|
|
|
index = this.hiddenElements.down.findIndex(c => c.element == refChild);
|
|
|
|
|
|
|
|
if(index !== -1) {
|
|
|
|
this.hiddenElements.down.splice(index, 0, {element: newChild, height: height});
|
|
|
|
this.paddings.down += height;
|
|
|
|
fastdom.mutate(() => {
|
|
|
|
this.paddingBottomDiv.style.height = this.paddings.down + 'px';
|
|
|
|
this.onScroll();
|
|
|
|
});
|
|
|
|
return index;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fastdom.mutate(() => {
|
|
|
|
this.log('inserting', newChild, 'before', refChild, this.splitUp.contains(refChild));
|
|
|
|
if(!this.splitUp.contains(refChild)) {
|
|
|
|
this.log.error('no refChild in splitUp', refChild, newChild, this.hiddenElements);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.splitUp.insertBefore(newChild, refChild);
|
|
|
|
this.onScroll();
|
|
|
|
});
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
public scrollIntoView(element: Element) {
|
|
|
|
if(element.parentElement) {
|
|
|
|
element.scrollIntoView();
|
|
|
|
} else if(this.splitUp) {
|
|
|
|
let index = this.hiddenElements.up.findIndex(e => e.element == element);
|
|
|
|
let y = 0;
|
|
|
|
if(index !== -1) {
|
|
|
|
for(let i = 0; i < index; ++i) {
|
|
|
|
y += this.hiddenElements.up[i].height;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.scrollTop = y;
|
|
|
|
} else if((index = this.hiddenElements.down.findIndex(e => e.element == element)) !== -1) {
|
|
|
|
y += this.paddings.up + this.size;
|
|
|
|
for(let i = 0; i < index; ++i) {
|
|
|
|
y += this.hiddenElements.down[i].height;
|
|
|
|
}
|
|
|
|
|
|
|
|
this.scrollTop = y;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
public lock(side: 'top' | 'down' | 'both' = 'down') {
|
|
|
|
if(side == 'top') this.prependLocked = true;
|
|
|
|
else if(side == 'down') this.appendLocked = true;
|
|
|
|
else this.prependLocked = this.appendLocked = true;
|
|
|
|
}
|
|
|
|
|
|
|
|
public unlock(side: 'top' | 'down' | 'both' = 'down') {
|
|
|
|
if(side == 'top') this.prependLocked = false;
|
|
|
|
else if(side == 'down') this.appendLocked = false;
|
|
|
|
else this.prependLocked = this.appendLocked = false;
|
|
|
|
}
|
|
|
|
|
|
|
|
set scrollTop(y: number) {
|
|
|
|
//fastdom.mutate(() => {
|
|
|
|
this.container.scrollTop = y;
|
|
|
|
//});
|
|
|
|
}
|
|
|
|
|
|
|
|
get scrollTop() {
|
|
|
|
return this.container.scrollTop;
|
|
|
|
}
|
|
|
|
|
|
|
|
get scrollHeight() {
|
|
|
|
return this.container.scrollHeight;
|
|
|
|
}
|
|
|
|
|
|
|
|
get innerHeight() {
|
|
|
|
return this.size;
|
|
|
|
}
|
|
|
|
|
|
|
|
get parentElement() {
|
|
|
|
return this.container.parentElement;
|
|
|
|
}
|
|
|
|
|
|
|
|
get offsetHeight() {
|
|
|
|
return this.container.offsetHeight;
|
|
|
|
}
|
|
|
|
|
|
|
|
get length() {
|
|
|
|
return this.hiddenElements.up.length + this.visibleElements.length + this.hiddenElements.down.length;
|
|
|
|
}
|
|
|
|
}
|