morethanwords
4 years ago
28 changed files with 14155 additions and 14930 deletions
@ -0,0 +1,425 @@ |
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import { logger, deferredPromise, CancellablePromise } from "../lib/polyfill"; |
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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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export default class Scrollable { |
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public container: 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 splitUp: HTMLElement; |
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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 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 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 = true; // true = bottom
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private setVisible(element: HTMLElement) { |
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if(this.visible.has(element)) return; |
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this.debug && this.log('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.debug && this.log('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(public el: HTMLElement, axis: 'y' | 'x' = 'y', public splitOffset = 300, logPrefix = '', public appendTo = el, public onScrollOffset = splitOffset, public splitCount = 15) { |
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this.container = document.createElement('div'); |
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this.container.classList.add('scrollable'); |
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this.visible = new Set(); |
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this.observer = new IntersectionObserver(entries => { |
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let filtered = entries.filter(entry => entry.isIntersecting); |
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//this.log('entries:', entries);
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entries.forEach(entry => { |
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let target = entry.target as HTMLElement; |
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if(entry.isIntersecting) { |
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this.setVisible(target); |
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this.debug && this.log('intersection entry:', entry, this.lastTopID, this.lastBottomID); |
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} else { |
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let id = +target.dataset.virtual; |
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let 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) { |
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return; |
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} |
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if(this.lastScrollDirection) { // 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.debug && this.log('entries:', entries, filtered, this.lastScrollDirection, this.lastTopID, this.lastBottomID); |
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let minVisibleID = this.lastTopID - this.splitCount; |
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let maxVisibleID = this.lastBottomID + this.splitCount; |
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for(let target of this.visible) { |
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let 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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// внизу - самый производительный вариант
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if(false) this.observer = new IntersectionObserver(entries => { |
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entries/* .filter(entry => entry.isIntersecting) */.forEach((entry, idx, arr) => { |
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let target = entry.target as HTMLElement; |
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if(entry.isIntersecting) { |
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let isTop = entry.boundingClientRect.top <= 0; |
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let isBottom = entry.rootBounds.height <= (entry.boundingClientRect.top + entry.boundingClientRect.height); |
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/* let id = +target.dataset.virtual; |
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let isOutOfRange = id < (this.lastTopID - 15) || id > (this.lastBottomID + 15); |
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if(isOutOfRange) { |
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this.debug && this.log('out of range, scroll jumped!'); |
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if(idx == 0) this.lastTopID = id; |
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else if(idx == (arr.length - 1)) this.lastBottomID = id; |
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} */ |
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this.setVisible(target); |
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if(isTop) { |
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/* this.lastTopID = id; |
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this.debug && this.log('set lastTopID to:', this.lastTopID); */ |
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for(let i = 0; i < 15; ++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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} else if(isBottom) { |
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/* this.lastBottomID = id; |
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this.debug && this.log('set lastBottomID to:', this.lastBottomID); */ |
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for(let i = 0; i < 15; ++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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} |
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} else { |
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this.setHidden(target); |
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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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/* let minVisibleID = this.lastTopID - 15; |
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let maxVisibleID = this.lastBottomID + 15; |
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for(let target of this.visible) { |
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let 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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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.container.addEventListener('mouseover', this.resize.bind(this)); // omg
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window.addEventListener('resize', () => { |
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window.requestAnimationFrame(() => { |
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this.onScroll(); |
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}); |
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}); |
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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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//this.onScroll();
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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.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.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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clearTimeout(this.disableHoverTimeout); |
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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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this.disableHoverTimeout = setTimeout(() => { |
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appendTo.classList.remove('disable-hover'); |
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if(!this.measureMutex.isFulfilled) { |
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this.measureMutex.resolve(); |
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} |
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}, 100); |
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if(this.onScrollMeasure) return; //window.cancelAnimationFrame(this.onScrollMeasure);
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this.onScrollMeasure = window.requestAnimationFrame(() => { |
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// @ts-ignore
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let scrollPos = this.container[this.scrollSide]; |
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//if(this.measureMutex.isFulfilled) {
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// @ts-ignore quick brown fix
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this.size = this.container[this.clientSize]; |
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// @ts-ignore
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let scrollSize = this.container[this.scrollType]; |
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this.scrollSize = scrollSize; |
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//this.measureMutex = deferredPromise<void>();
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//}
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let scrollTop = scrollPos - this.scrollTopOffset; |
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let maxScrollTop = this.scrollSize - this.scrollTopOffset - this.size; |
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if(this.onScrolledBottom) { |
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if((maxScrollTop - scrollTop) <= this.onScrollOffset) { |
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//if(!this.onScrolledBottomFired) {
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this.onScrolledBottomFired = true; |
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this.onScrolledBottom(); |
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//}
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} else { |
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this.onScrolledBottomFired = false; |
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} |
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} |
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if(this.onScrolledTop) { |
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//this.log('onScrolledTop:', scrollTop, this.onScrollOffset);
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if(scrollTop <= this.onScrollOffset) { |
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this.onScrolledTopFired = true; |
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this.onScrolledTop(); |
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} else { |
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this.onScrolledTopFired = false; |
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} |
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} |
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this.lastScrollDirection = this.lastScrollTop < scrollTop; |
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this.lastScrollTop = scrollTop; |
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this.onScrollMeasure = 0; |
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}); |
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} |
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public prepareElement(element: HTMLElement, append = true) { |
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element.dataset.virtual = '' + (append ? this.virtualTempIDBottom++ : this.virtualTempIDTop--); |
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this.debug && this.log('prepareElement: prepared'); |
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window.requestAnimationFrame(() => { |
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let {scrollHeight/* , scrollWidth */} = element; |
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this.debug && this.log('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: Element) { |
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if(element.parentElement) { |
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element.scrollIntoView(); |
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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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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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get length() { |
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return this.appendTo.childElementCount; |
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} |
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} |
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