@ciri/ngx-carousel
Version:
A simple angular carousel component.
520 lines • 39.4 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: lib/carousel/carousel.component.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChildren, ElementRef, EventEmitter, forwardRef, Input, Output, QueryList, Renderer2, TemplateRef, ViewChild, ViewEncapsulation } from '@angular/core';
import { BehaviorSubject, interval, Subject, timer } from 'rxjs';
import { debounceTime, distinctUntilChanged, filter, skip, startWith, takeUntil } from 'rxjs/operators';
import { animationFrame } from 'rxjs/internal/scheduler/animationFrame';
import { CarouselItemComponent } from '../carousel-item/carousel-item.component';
import { CAROUSEL, clamp, inRange } from '../../utils';
export class CarouselComponent {
// 后镜像节点
/**
* @param {?} renderer
* @param {?} hostElRef
* @param {?} cdr
*/
constructor(renderer, hostElRef, cdr) {
this.renderer = renderer;
this.hostElRef = hostElRef;
this.cdr = cdr;
/**
* 是否开启无缝模式
*/
this.loop = false;
/**
* 切换速度(ms)
*/
this.speed = 300;
/**
* 自动轮播时间间隔,0 代表关闭自动轮播
*/
this.autoplay = 0;
/**
* 是否跟随手指滑动,设为 false 代表只在松手后进行移动判断
*/
this.followFinger = true;
/**
* 是否允许手动滑动,设为 false 代表只能通过 api 翻页
*/
this.allowTouchMove = true;
/**
* 默认激活项
*/
this.initialIndex = 0;
/**
* lazyRender 模式下预渲染个数,1 代表左右多渲染一个,2 代表左右多渲染两个,...
*/
this.lazyRenderOffset = 0;
/**
* 是否缓存 lazyRender 模式下渲染过的 item,不从 dom 树中删除
*/
this.cache = false;
/**
* 索引变动时触发
*/
this.indexChange = new EventEmitter();
this.active$ = new BehaviorSubject(null);
this.destroy$ = new Subject();
this.percent = 0; // 手指滑动距离所占宽度总和百分比
// 手指滑动距离所占宽度总和百分比
this.offset = 0; // 偏移量(%)
// 偏移量(%)
this.animating = false; // 是否处于过渡效果中
}
/**
* @return {?}
*/
get active() {
return this.active$.value;
}
/**
* @return {?}
*/
get count() {
return (this.items || []).length;
}
/**
* @return {?}
*/
get viewport() {
return this.hostElRef.nativeElement;
}
/**
* @return {?}
*/
get width() {
return this.viewport.offsetWidth;
}
/**
* @return {?}
*/
get canMove() {
return this.allowTouchMove && !this.animating;
}
/**
* @return {?}
*/
get data() {
return {
active: this.active,
count: this.count,
offset: this.offset,
animating: this.animating,
atFirst: this.active === 0,
atLast: this.active === this.count - 1
};
}
/**
* @return {?}
*/
ngOnInit() { }
/**
* @return {?}
*/
ngAfterViewInit() {
this.items.changes
.pipe(takeUntil(this.destroy$), startWith(null), debounceTime(0, animationFrame))
.subscribe((/**
* @return {?}
*/
() => {
this.init();
}));
this.active$
.pipe(takeUntil(this.destroy$), skip(1), filter((/**
* @param {?} v
* @return {?}
*/
v => v !== null && inRange(v, 0, this.count - 1))), distinctUntilChanged())
.subscribe((/**
* @param {?} res
* @return {?}
*/
res => {
this.indexChange.emit(res);
this.cdr.markForCheck();
}));
// resize 功能待开发
// resize(this.viewport)
// .pipe(takeUntil(this.destroy$), debounceTime(0, animationFrame))
// .subscribe(() => {
// // this.updateWidth()
// // this.goTo(this.active, true)
// })
}
/**
* @return {?}
*/
ngOnDestroy() {
this.destroy$.next();
this.destroy$.complete();
}
/**
* @param {?} e
* @return {?}
*/
onPanStart(e) {
this.stopAutoplay();
}
/**
* @param {?} e
* @return {?}
*/
onPanMove(e) {
if (!this.canMove) {
return;
}
/** @type {?} */
const deltaX = this.getSafeDeltaX(e.deltaX);
this.percent = ((100 / this.count) * deltaX) / this.width;
if (this.followFinger) {
/** @type {?} */
const offset = this.percent - (100 / this.count) * this.active;
this.move(offset, true);
}
}
/**
* @param {?} e
* @return {?}
*/
onPanEnd(e) {
if (!this.canMove) {
return;
}
// 轻拂或者滑动距离大于等于一个节点宽度的 50% 才进行跳转
/** @type {?} */
let newActive = this.active;
/** @type {?} */
const isSwipeLeft = e.direction === Hammer.DIRECTION_LEFT && e.velocityX < -0.3;
/** @type {?} */
const isSwipeRight = e.direction === Hammer.DIRECTION_RIGHT && e.velocityX > 0.3;
if (isSwipeLeft || this.percent <= -50 / this.count) {
newActive++;
}
else if (isSwipeRight || this.percent >= 50 / this.count) {
newActive--;
}
this.goTo(newActive);
this.startAutoplay();
}
/**
* @param {?=} target
* @param {?=} immediate
* @return {?}
*/
goTo(target = 0, immediate = false) {
if (this.animating) {
return;
}
/** @type {?} */
const active = this.getSafeActive(target);
/** @type {?} */
const realActive = this.getRealActive(active);
this.active$.next(realActive);
// 到达第一个或最后一个时更新镜像节点
if (this.loop && (realActive === 0 || realActive === this.count - 1)) {
this.handleMirrorNodes();
}
this.animating = true;
this.move(-(100 / this.count) * active, immediate).subscribe((/**
* @return {?}
*/
() => {
this.animating = false;
if (active === -1 || active === this.count) {
this.goTo(realActive, true);
}
}));
}
/**
* @return {?}
*/
prev() {
this.goTo(this.active - 1);
}
/**
* @return {?}
*/
next() {
this.goTo(this.active + 1);
}
/**
* @private
* @return {?}
*/
init() {
if (this.items.length === 0) {
return;
}
this.items.forEach((/**
* @param {?} el
* @param {?} index
* @return {?}
*/
(el, index) => {
el.index = index;
this.renderer.setStyle(el.elRef.nativeElement, 'width', `${this.width}px`);
}));
this.goTo(this.getSafeActive(this.initialIndex, true), true);
this.startAutoplay();
}
/**
* @private
* @param {?} deltaX
* @return {?}
*/
getSafeDeltaX(deltaX) {
/** @type {?} */
const w = this.width;
return clamp(deltaX, -w, w);
}
/**
* @private
* @param {?} active
* @param {?=} strict
* @return {?}
*/
getSafeActive(active, strict = false) {
/** @type {?} */
const min = this.loop && !strict ? -1 : 0;
/** @type {?} */
const max = this.loop && !strict ? this.count : this.count - 1;
return clamp(active, min, max);
}
// 计算真实索引
// 由于 loop 模式下拷贝了俩节点,所以 active 有误差
// 假设有三个节点,那么 active 非 loop 模式下为 0 ~ 2,loop 模式下为 -1 ~ 3
/**
* @private
* @param {?} active
* @return {?}
*/
getRealActive(active) {
return (active + this.count) % this.count;
}
// loop 模式下首尾拷贝一个节点,模拟无缝轮播
// 0 1 2 => 2 0 1 2 0
// TODO: 也许能找到一个不用手动复制 dom,并且可以自动更新内容的方式
/**
* @private
* @return {?}
*/
handleMirrorNodes() {
/** @type {?} */
const trackEl = this.track.nativeElement
// 清理镜像节点
;
// 清理镜像节点
try {
this.renderer.removeChild(trackEl, this.preMirrorNode);
this.renderer.removeChild(trackEl, this.postMirrorNode);
}
catch (e) { }
const { first, last } = this.items;
this.preMirrorNode = last.elRef.nativeElement.cloneNode(true);
this.postMirrorNode = first.elRef.nativeElement.cloneNode(true);
this.renderer.addClass(this.preMirrorNode, 'pre-mirror-node');
this.renderer.addClass(this.postMirrorNode, 'post-mirror-node');
this.renderer.insertBefore(trackEl, this.preMirrorNode, first.elRef.nativeElement);
this.renderer.appendChild(trackEl, this.postMirrorNode);
}
/**
* @private
* @param {?} offset
* @param {?=} immediate
* @return {?}
*/
move(offset, immediate = false) {
/** @type {?} */
const el = this.track.nativeElement;
/** @type {?} */
const oldOffset = this.offset;
/** @type {?} */
const newOffset = (this.offset = offset);
this.renderer.setStyle(el, 'transition', immediate ? 'none' : `transform ${this.speed}ms`);
this.renderer.setStyle(el, 'transform', `translate3d(${offset}%, 0, 0)`);
return timer(immediate || newOffset === oldOffset ? 0 : this.speed).pipe(takeUntil(this.destroy$));
}
/**
* @private
* @return {?}
*/
startAutoplay() {
if (!this.autoplay || this.count <= 1) {
return;
}
this.stopAutoplay();
this.intervalSub = interval(this.autoplay + this.speed)
.pipe(takeUntil(this.destroy$))
.subscribe((/**
* @return {?}
*/
() => {
/** @type {?} */
const oldActive = this.active;
/** @type {?} */
const newActive = this.loop ? oldActive + 1 : this.getRealActive(oldActive + 1);
this.goTo(newActive);
}));
}
/**
* @private
* @return {?}
*/
stopAutoplay() {
this.intervalSub && this.intervalSub.unsubscribe();
}
}
CarouselComponent.decorators = [
{ type: Component, args: [{
selector: 'ngx-carousel',
template: "<div\n class=\"ngx-carousel__track\"\n #track\n (dragstart)=\"$event.preventDefault()\"\n (panstart)=\"onPanStart($event)\"\n (panmove)=\"onPanMove($event)\"\n (panend)=\"onPanEnd($event)\"\n (pancancel)=\"onPanEnd($event)\"\n>\n <ng-content></ng-content>\n</div>\n\n<div class=\"ngx-carousel__indicator\" *ngIf=\"!indicator\">\n <div\n *ngFor=\"let item of items; let i = index\"\n [class.active]=\"i === active\"\n ></div>\n</div>\n\n<ng-container *ngTemplateOutlet=\"indicator; context: { $implicit: data }\"></ng-container>\n",
encapsulation: ViewEncapsulation.None,
changeDetection: ChangeDetectionStrategy.OnPush,
host: {
'[class.ngx-carousel]': `true`
},
providers: [
{
provide: CAROUSEL,
useExisting: forwardRef((/**
* @return {?}
*/
() => CarouselComponent))
}
],
styles: [".ngx-carousel{position:relative;display:block;overflow:hidden}.ngx-carousel__track{position:relative;display:inline-block;white-space:nowrap}.ngx-carousel__indicator{position:absolute;bottom:10px;width:100%;text-align:center;white-space:nowrap;font-size:0;pointer-events:none}.ngx-carousel__indicator div{display:inline-block;width:6px;height:6px;margin:0 3px;border-radius:50%;background:rgba(0,0,0,.25);pointer-events:auto}.ngx-carousel__indicator div.active{background:rgba(0,0,0,.75)}"]
}] }
];
/** @nocollapse */
CarouselComponent.ctorParameters = () => [
{ type: Renderer2 },
{ type: ElementRef },
{ type: ChangeDetectorRef }
];
CarouselComponent.propDecorators = {
loop: [{ type: Input }],
speed: [{ type: Input }],
autoplay: [{ type: Input }],
followFinger: [{ type: Input }],
allowTouchMove: [{ type: Input }],
indicator: [{ type: Input }],
initialIndex: [{ type: Input }],
lazyRenderOffset: [{ type: Input }],
cache: [{ type: Input }],
indexChange: [{ type: Output }],
track: [{ type: ViewChild, args: ['track', { static: false },] }],
items: [{ type: ContentChildren, args: [CarouselItemComponent,] }]
};
if (false) {
/**
* 是否开启无缝模式
* @type {?}
*/
CarouselComponent.prototype.loop;
/**
* 切换速度(ms)
* @type {?}
*/
CarouselComponent.prototype.speed;
/**
* 自动轮播时间间隔,0 代表关闭自动轮播
* @type {?}
*/
CarouselComponent.prototype.autoplay;
/**
* 是否跟随手指滑动,设为 false 代表只在松手后进行移动判断
* @type {?}
*/
CarouselComponent.prototype.followFinger;
/**
* 是否允许手动滑动,设为 false 代表只能通过 api 翻页
* @type {?}
*/
CarouselComponent.prototype.allowTouchMove;
/**
* 自定义指示器
* @type {?}
*/
CarouselComponent.prototype.indicator;
/**
* 默认激活项
* @type {?}
*/
CarouselComponent.prototype.initialIndex;
/**
* lazyRender 模式下预渲染个数,1 代表左右多渲染一个,2 代表左右多渲染两个,...
* @type {?}
*/
CarouselComponent.prototype.lazyRenderOffset;
/**
* 是否缓存 lazyRender 模式下渲染过的 item,不从 dom 树中删除
* @type {?}
*/
CarouselComponent.prototype.cache;
/**
* 索引变动时触发
* @type {?}
*/
CarouselComponent.prototype.indexChange;
/** @type {?} */
CarouselComponent.prototype.track;
/** @type {?} */
CarouselComponent.prototype.items;
/** @type {?} */
CarouselComponent.prototype.active$;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.destroy$;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.intervalSub;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.percent;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.offset;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.animating;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.preMirrorNode;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.postMirrorNode;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.renderer;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.hostElRef;
/**
* @type {?}
* @private
*/
CarouselComponent.prototype.cdr;
}
//# 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{\n  AfterViewInit,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChildren,\n  ElementRef,\n  EventEmitter,\n  forwardRef,\n  Input,\n  OnDestroy,\n  OnInit,\n  Output,\n  QueryList,\n  Renderer2,\n  SimpleChanges,\n  TemplateRef,\n  ViewChild,\n  ViewEncapsulation\n} from '@angular/core'\nimport { BehaviorSubject, interval, Subject, Subscription, timer } from 'rxjs'\nimport {\n  debounceTime,\n  distinctUntilChanged,\n  filter,\n  skip,\n  startWith,\n  takeUntil\n} from 'rxjs/operators'\nimport { animationFrame } from 'rxjs/internal/scheduler/animationFrame'\nimport { CarouselData } from '../carousel.model'\nimport { CarouselItemComponent } from '../carousel-item/carousel-item.component'\nimport { CAROUSEL, clamp, inRange, resize } from '../../utils'\n\n@Component({\n  selector: 'ngx-carousel',\n  templateUrl: './carousel.component.html',\n  styleUrls: ['./carousel.component.less'],\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  host: {\n    '[class.ngx-carousel]': `true`\n  },\n  providers: [\n    {\n      provide: CAROUSEL,\n      useExisting: forwardRef(() => CarouselComponent)\n    }\n  ]\n})\nexport class CarouselComponent implements OnInit, AfterViewInit, OnDestroy {\n  /** 是否开启无缝模式 */\n  @Input() loop: boolean = false\n  /** 切换速度（ms） */\n  @Input() speed: number = 300\n  /** 自动轮播时间间隔，0 代表关闭自动轮播 */\n  @Input() autoplay: number = 0\n  /** 是否跟随手指滑动，设为 false 代表只在松手后进行移动判断 */\n  @Input() followFinger: boolean = true\n  /** 是否允许手动滑动，设为 false 代表只能通过 api 翻页 */\n  @Input() allowTouchMove: boolean = true\n  /** 自定义指示器 */\n  @Input() indicator: TemplateRef<{ $implicit: CarouselData }>\n  /** 默认激活项 */\n  @Input() initialIndex: number = 0\n  /** lazyRender 模式下预渲染个数，1 代表左右多渲染一个，2 代表左右多渲染两个，... */\n  @Input() lazyRenderOffset: number = 0\n  /** 是否缓存 lazyRender 模式下渲染过的 item，不从 dom 树中删除 */\n  @Input() cache: boolean = false\n\n  /** 索引变动时触发 */\n  @Output() indexChange = new EventEmitter<number>()\n\n  @ViewChild('track', { static: false }) track: ElementRef\n  @ContentChildren(CarouselItemComponent) items: QueryList<CarouselItemComponent>\n\n  get active() {\n    return this.active$.value\n  }\n\n  get count() {\n    return (this.items || []).length\n  }\n\n  get viewport() {\n    return this.hostElRef.nativeElement\n  }\n\n  get width() {\n    return this.viewport.offsetWidth\n  }\n\n  get canMove() {\n    return this.allowTouchMove && !this.animating\n  }\n\n  get data(): CarouselData {\n    return {\n      active: this.active,\n      count: this.count,\n      offset: this.offset,\n      animating: this.animating,\n      atFirst: this.active === 0,\n      atLast: this.active === this.count - 1\n    }\n  }\n  active$ = new BehaviorSubject<number>(null)\n  private destroy$ = new Subject()\n  private intervalSub: Subscription\n  private percent = 0 // 手指滑动距离所占宽度总和百分比\n  private offset = 0 // 偏移量（%）\n  private animating = false // 是否处于过渡效果中\n  private preMirrorNode: Node // 前镜像节点\n  private postMirrorNode: Node // 后镜像节点\n\n  constructor(\n    private renderer: Renderer2,\n    private hostElRef: ElementRef,\n    private cdr: ChangeDetectorRef\n  ) {}\n\n  ngOnInit() {}\n\n  ngAfterViewInit() {\n    this.items.changes\n      .pipe(takeUntil(this.destroy$), startWith(null), debounceTime(0, animationFrame))\n      .subscribe(() => {\n        this.init()\n      })\n\n    this.active$\n      .pipe(\n        takeUntil(this.destroy$),\n        skip(1),\n        filter(v => v !== null && inRange(v, 0, this.count - 1)),\n        distinctUntilChanged()\n      )\n      .subscribe(res => {\n        this.indexChange.emit(res)\n        this.cdr.markForCheck()\n      })\n\n    // resize 功能待开发\n    // resize(this.viewport)\n    //   .pipe(takeUntil(this.destroy$), debounceTime(0, animationFrame))\n    //   .subscribe(() => {\n    //     // this.updateWidth()\n    //     // this.goTo(this.active, true)\n    //   })\n  }\n\n  ngOnDestroy() {\n    this.destroy$.next()\n    this.destroy$.complete()\n  }\n\n  onPanStart(e: HammerInput) {\n    this.stopAutoplay()\n  }\n\n  onPanMove(e: HammerInput) {\n    if (!this.canMove) {\n      return\n    }\n    const deltaX = this.getSafeDeltaX(e.deltaX)\n    this.percent = ((100 / this.count) * deltaX) / this.width\n\n    if (this.followFinger) {\n      const offset = this.percent - (100 / this.count) * this.active\n      this.move(offset, true)\n    }\n  }\n\n  onPanEnd(e: HammerInput) {\n    if (!this.canMove) {\n      return\n    }\n    // 轻拂或者滑动距离大于等于一个节点宽度的 50% 才进行跳转\n    let newActive = this.active\n    const isSwipeLeft = e.direction === Hammer.DIRECTION_LEFT && e.velocityX < -0.3\n    const isSwipeRight = e.direction === Hammer.DIRECTION_RIGHT && e.velocityX > 0.3\n    if (isSwipeLeft || this.percent <= -50 / this.count) {\n      newActive++\n    } else if (isSwipeRight || this.percent >= 50 / this.count) {\n      newActive--\n    }\n    this.goTo(newActive)\n    this.startAutoplay()\n  }\n\n  goTo(target = 0, immediate = false) {\n    if (this.animating) {\n      return\n    }\n\n    const active = this.getSafeActive(target)\n    const realActive = this.getRealActive(active)\n    this.active$.next(realActive)\n\n    // 到达第一个或最后一个时更新镜像节点\n    if (this.loop && (realActive === 0 || realActive === this.count - 1)) {\n      this.handleMirrorNodes()\n    }\n\n    this.animating = true\n    this.move(-(100 / this.count) * active, immediate).subscribe(() => {\n      this.animating = false\n      if (active === -1 || active === this.count) {\n        this.goTo(realActive, true)\n      }\n    })\n  }\n\n  prev() {\n    this.goTo(this.active - 1)\n  }\n\n  next() {\n    this.goTo(this.active + 1)\n  }\n\n  private init() {\n    if (this.items.length === 0) {\n      return\n    }\n    this.items.forEach((el, index) => {\n      el.index = index\n      this.renderer.setStyle(el.elRef.nativeElement, 'width', `${this.width}px`)\n    })\n    this.goTo(this.getSafeActive(this.initialIndex, true), true)\n    this.startAutoplay()\n  }\n\n  private getSafeDeltaX(deltaX) {\n    const w = this.width\n    return clamp(deltaX, -w, w)\n  }\n\n  private getSafeActive(active, strict = false) {\n    const min = this.loop && !strict ? -1 : 0\n    const max = this.loop && !strict ? this.count : this.count - 1\n    return clamp(active, min, max)\n  }\n\n  // 计算真实索引\n  // 由于 loop 模式下拷贝了俩节点，所以 active 有误差\n  // 假设有三个节点，那么 active 非 loop 模式下为 0 ～ 2，loop 模式下为 -1 ～ 3\n  private getRealActive(active) {\n    return (active + this.count) % this.count\n  }\n\n  // loop 模式下首尾拷贝一个节点，模拟无缝轮播\n  // 0 1 2 => 2 0 1 2 0\n  // TODO: 也许能找到一个不用手动复制 dom，并且可以自动更新内容的方式\n  private handleMirrorNodes() {\n    const trackEl = this.track.nativeElement\n    // 清理镜像节点\n    try {\n      this.renderer.removeChild(trackEl, this.preMirrorNode)\n      this.renderer.removeChild(trackEl, this.postMirrorNode)\n    } catch (e) {}\n\n    const { first, last } = this.items\n    this.preMirrorNode = last.elRef.nativeElement.cloneNode(true)\n    this.postMirrorNode = first.elRef.nativeElement.cloneNode(true)\n\n    this.renderer.addClass(this.preMirrorNode, 'pre-mirror-node')\n    this.renderer.addClass(this.postMirrorNode, 'post-mirror-node')\n    this.renderer.insertBefore(trackEl, this.preMirrorNode, first.elRef.nativeElement)\n    this.renderer.appendChild(trackEl, this.postMirrorNode)\n  }\n\n  private move(offset, immediate = false) {\n    const el = this.track.nativeElement\n    const oldOffset = this.offset\n    const newOffset = (this.offset = offset)\n\n    this.renderer.setStyle(el, 'transition', immediate ? 'none' : `transform ${this.speed}ms`)\n    this.renderer.setStyle(el, 'transform', `translate3d(${offset}%, 0, 0)`)\n\n    return timer(immediate || newOffset === oldOffset ? 0 : this.speed).pipe(\n      takeUntil(this.destroy$)\n    )\n  }\n\n  private startAutoplay() {\n    if (!this.autoplay || this.count <= 1) {\n      return\n    }\n\n    this.stopAutoplay()\n\n    this.intervalSub = interval(this.autoplay + this.speed)\n      .pipe(takeUntil(this.destroy$))\n      .subscribe(() => {\n        const oldActive = this.active\n        const newActive = this.loop ? oldActive + 1 : this.getRealActive(oldActive + 1)\n        this.goTo(newActive)\n      })\n  }\n\n  private stopAutoplay() {\n    this.intervalSub && this.intervalSub.unsubscribe()\n  }\n}\n"]}