107 lines
3.0 KiB
TypeScript
107 lines
3.0 KiB
TypeScript
import {TransitionGroupItemDirective} from "./transition-group-item.directive";
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import {AfterViewInit, Component, ContentChildren, Input, OnDestroy, QueryList} from "@angular/core";
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import {Subscription} from "rxjs";
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import Timeout = NodeJS.Timeout;
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@Component({
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selector: '[transition-group]',
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template: '<ng-content></ng-content>'
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})
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export class TransitionGroupComponent implements AfterViewInit, OnDestroy {
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@ContentChildren(TransitionGroupItemDirective) items: QueryList<TransitionGroupItemDirective>;
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private subscription: Subscription;
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private timeout: Timeout;
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ngAfterViewInit() {
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this.init();
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this.subscription = this.items.changes.subscribe(items => {
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items.forEach(item => item.prevPos = item.newPos || item.prevPos);
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items.forEach(this.runCallback);
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this.refreshPosition('newPos');
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items.forEach(item => item.prevPos = item.prevPos || item.newPos); // for new items
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const animate = () => {
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items.forEach(this.applyTranslation);
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this['_forceReflow'] = document.body.offsetHeight; // force reflow to put everything in position
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this.items.forEach(this.runTransition.bind(this));
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}
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const willMoveSome = items.some((item) => {
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const dx = item.prevPos.left - item.newPos.left;
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const dy = item.prevPos.top - item.newPos.top;
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return dx || dy;
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});
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if (willMoveSome) {
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animate();
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} else {
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setTimeout(() => { // for removed items
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this.refreshPosition('newPos');
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animate();
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}, 0);
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}
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});
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}
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ngOnDestroy() {
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this.clear();
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if (this.subscription) {
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this.subscription.unsubscribe();
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}
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}
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clear() {
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if (this.timeout) {
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clearTimeout(this.timeout);
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}
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}
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init() {
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this.clear();
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this.refreshPosition('prevPos');
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this.refreshPosition('newPos');
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}
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runCallback(item: TransitionGroupItemDirective) {
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if (item.moveCallback) {
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item.moveCallback();
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}
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}
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runTransition(item: TransitionGroupItemDirective) {
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if (!item.moved) {
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return;
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}
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const cssClass = 'list-move';
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let el = item.el;
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let style: any = el.style;
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el.classList.add(cssClass);
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style.transform = style.WebkitTransform = style.transitionDuration = '';
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el.addEventListener('transitionend', item.moveCallback = (e: any) => {
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if (!e || /transform$/.test(e.propertyName)) {
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el.removeEventListener('transitionend', item.moveCallback);
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item.moveCallback = null;
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el.classList.remove(cssClass);
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}
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});
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}
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refreshPosition(prop: string) {
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this.items.forEach(item => {
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item[prop] = item.el.getBoundingClientRect();
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});
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}
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applyTranslation(item: TransitionGroupItemDirective) {
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item.moved = false;
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const dx = item.prevPos.left - item.newPos.left;
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const dy = item.prevPos.top - item.newPos.top;
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if (dx || dy) {
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item.moved = true;
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let style: any = item.el.style;
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style.transform = style.WebkitTransform = 'translate(' + dx + 'px,' + dy + 'px)';
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style.transitionDuration = '0s';
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}
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}
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}
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