Eduard Kuzmenko
4 years ago
12 changed files with 720 additions and 173 deletions
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import { cancelEvent } from "../lib/utils"; |
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//import {measure} from 'fastdom/fastdom.min';
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import {measure} from 'fastdom'; |
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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 scrollType: string; |
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public scrollSide: string; |
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public clientAxis: string; |
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public scrollSize = -1; |
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public size = 0; |
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public thumbSize = 0; |
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public hiddenElements: { |
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up: {element: Element, height: number}[], |
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down: {element: Element, height: number}[] |
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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 splitOffset = 1500; |
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public onAddedBottom: () => void = null; |
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public topObserver: IntersectionObserver; |
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public isTopIntersecting: boolean; |
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public bottomObserver: IntersectionObserver; |
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public isBottomIntersecting: boolean; |
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public splitObserver: IntersectionObserver; |
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constructor(public el: HTMLDivElement, x = false, y = true) { |
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this.container = document.createElement('div'); |
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this.container.classList.add('scrollable'); |
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let arr = []; |
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for(let i = 0.001; i < 1; i += 0.001) arr.push(i); |
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this.topObserver = new IntersectionObserver(entries => { |
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let entry = entries[0]; |
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// console.log('top intersection:', entries, this.isTopIntersecting, entry.isIntersecting, entry.intersectionRatio > 0);
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if(this.isTopIntersecting = entry.isIntersecting) { |
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this.onTopIntersection(entry); |
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} |
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// console.log('top intersection end');
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}, {threshold: arr}); |
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this.bottomObserver = new IntersectionObserver(entries => { |
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let entry = entries[0]; |
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// console.log('bottom intersection:', entries, this.isBottomIntersecting, entry.isIntersecting, entry.intersectionRatio > 0);
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if(this.isBottomIntersecting = entry.isIntersecting) { |
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this.onBottomIntersection(entry); |
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if(this.onScrolledBottom) this.onScrolledBottom(); |
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} |
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}, {threshold: arr}); |
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this.splitObserver = new IntersectionObserver(entries => { |
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//console.log('splitObserver', entries);
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for(let entry of entries) { |
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//console.log('onscroll entry', entry.target, entry.isIntersecting, entry);
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if(!entry.isIntersecting && entry.target.parentElement && entry.rootBounds) { |
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let child = entry.target; |
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//console.log('onscroll entry', entry.boundingClientRect, child, entry);
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let isTop = entry.boundingClientRect.top <= 0; |
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let isBottom = entry.rootBounds.height <= entry.boundingClientRect.top; |
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let needHeight = this.splitOffset; |
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if(isTop) { |
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let sliced: Element[] = [/* child */]; |
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do { |
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if(needHeight > 0) { |
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needHeight -= child.scrollHeight; |
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} else { |
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sliced.push(child); |
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} |
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} while(child = child.previousElementSibling); |
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let length = sliced.length; |
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for(let i = length - 1; i >= 0; --i) { |
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let child = sliced[i]; |
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let height = child.scrollHeight; |
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this.paddings.up += height; |
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this.hiddenElements.up.push({element: child, height}); |
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child.parentElement.removeChild(child); |
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} |
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this.paddingTopDiv.style.height = this.paddings.up + 'px'; |
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//console.log('onscroll sliced up', sliced);
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} else if(isBottom) { |
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let sliced: Element[] = [/* child */]; |
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do { |
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if(needHeight > 0) { |
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needHeight -= child.scrollHeight; |
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} else { |
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sliced.push(child); |
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} |
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} while(child = child.nextElementSibling); |
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let length = sliced.length; |
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for(let i = length - 1; i >= 0; --i) { |
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let child = sliced[i]; |
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let height = child.scrollHeight; |
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this.paddings.down += height; |
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this.hiddenElements.down.unshift({element: child, height}); |
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child.parentElement.removeChild(child); |
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} |
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this.paddingBottomDiv.style.height = this.paddings.down + 'px'; |
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//console.log('onscroll sliced down', sliced);
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} |
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//console.log('splitObserver', entry, entry.target, isTop);
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} |
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} |
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}); |
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if(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.scrollType = 'scrollWidth'; |
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this.scrollSide = 'scrollLeft'; |
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this.clientAxis = 'clientX'; |
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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(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.scrollType = 'scrollHeight'; |
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this.scrollSide = 'scrollTop'; |
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this.clientAxis = 'clientY'; |
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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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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', this.resize.bind(this)); |
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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.topObserver.observe(this.paddingTopDiv); |
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this.bottomObserver.observe(this.paddingBottomDiv); |
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this.container.addEventListener('scroll', this.onScroll.bind(this)); |
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//this.container.append(this.paddingTopDiv);
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Array.from(el.children).forEach(c => this.container.append(c)); |
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//this.container.append(this.paddingBottomDiv);
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el.append(this.container);//container.append(el);
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this.container.parentElement.append(this.thumb); |
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this.resize(); |
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} |
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public resize() { |
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//console.time('scroll resize');
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// @ts-ignore
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this.scrollSize = this.container[this.scrollType]; |
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let rect = this.container.getBoundingClientRect(); |
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// @ts-ignore
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this.size = rect[this.type]; |
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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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//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.hiddenElements.up.length = this.hiddenElements.down.length = 0; |
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this.paddings.up = this.paddings.down = 0; |
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if(this.paddingTopDiv.parentElement) { |
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this.paddingTopDiv.style.height = ''; |
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this.paddingBottomDiv.style.height = ''; |
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} |
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/* this.topObserver.unobserve(this.paddingTopDiv); |
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this.bottomObserver.unobserve(this.paddingBottomDiv); |
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this.topObserver.observe(this.paddingTopDiv); |
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this.bottomObserver.observe(this.paddingBottomDiv); */ |
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if(el) { |
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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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} |
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public onScroll() { |
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// @ts-ignore
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//let st = container[scrollSide];
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//console.time('scroll onScroll');
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// @ts-ignore
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if(this.container[this.scrollType] != this.scrollSize || this.thumbSize == 0) { |
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this.resize(); |
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} |
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// @ts-ignore
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let value = this.container[this.scrollSide] / (this.scrollSize - this.size) * 100; |
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let maxValue = 100 - (this.thumbSize / this.size * 100); |
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//console.log('onscroll', container.scrollHeight, thumbHeight, height, value, maxValue);
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// @ts-ignore
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this.thumb.style[this.side] = (value >= maxValue ? maxValue : value) + '%'; |
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//console.timeEnd('scroll onScroll');
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} |
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public onTopIntersection(entry: IntersectionObserverEntry) { |
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// console.log('onTopIntersection');
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if(this.hiddenElements.up.length && this.paddings.up) { |
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let needHeight = entry.intersectionRect.height + this.splitOffset; |
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while(needHeight > 0 && this.paddings.up) { |
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let child = this.hiddenElements.up.pop(); |
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// console.log('top returning from hidden', child);
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if(!child) { |
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this.paddings.up = 0; |
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this.paddingTopDiv.style.height = '0px'; |
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break; |
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} |
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/* await new Promise((resolve, reject) => { |
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window.requestAnimationFrame(resolve); |
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}); */ |
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this.splitUp.prepend(child.element); |
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let height = child.height || child.element.scrollHeight; |
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needHeight -= height; |
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this.paddings.up -= height; |
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this.paddingTopDiv.style.height = this.paddings.up + 'px'; |
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} |
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} else { |
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this.paddingTopDiv.style.height = '0px'; |
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} |
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} |
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public onBottomIntersection(entry: IntersectionObserverEntry) { |
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// console.log('onBottomIntersection');
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if(this.hiddenElements.down.length && this.paddings.down) { |
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let needHeight = entry.intersectionRect.height + this.splitOffset; |
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while(needHeight > 0 && this.paddings.down) { |
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let child = this.hiddenElements.down.shift(); |
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if(!child) { |
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this.paddings.down = 0; |
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this.paddingBottomDiv.style.height = '0px'; |
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break; |
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} |
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this.splitUp.append(child.element); |
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let height = child.height || child.element.scrollHeight; |
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needHeight -= height; |
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this.paddings.down -= height; |
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this.paddingBottomDiv.style.height = this.paddings.down + 'px'; |
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} |
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if(this.onAddedBottom) this.onAddedBottom(); |
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} else { |
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this.paddingBottomDiv.style.height = '0px'; |
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} |
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} |
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public onScrolledBottom() { |
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} |
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public prepend(...smth: (string | Node)[]) { |
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if(this.splitUp) { |
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this.splitUp.prepend(...smth); |
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for(let node of smth) { |
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if(typeof(node) !== 'string') { |
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this.splitObserver.unobserve(node as Element); |
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this.splitObserver.observe(node as Element); |
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} |
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} |
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} else { |
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this.container.prepend(...smth); |
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} |
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} |
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public append(...smth: (string | Node)[]) { |
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if(this.splitUp) { |
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this.splitUp.append(...smth); |
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for(let node of smth) { |
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if(typeof(node) !== 'string') { |
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this.splitObserver.unobserve(node as Element); |
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this.splitObserver.observe(node as Element); |
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} |
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} |
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} else { |
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this.container.append(...smth); |
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} |
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} |
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public insertBefore(newChild: Element, refChild: Element) { |
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if(this.splitUp) { |
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this.splitObserver.unobserve(newChild); |
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return this.splitUp.insertBefore(newChild, refChild); |
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} |
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return this.container.insertBefore(newChild, refChild); |
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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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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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get parentElement() { |
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return this.container.parentElement; |
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} |
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get offsetHeight() { |
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return this.container.offsetHeight; |
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} |
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} |
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