ng-devui
Version:
DevUI components based on Angular
96 lines • 13.1 kB
JavaScript
import { Directive, ElementRef, EventEmitter, Input, Output } from '@angular/core';
import { fromEvent } from 'rxjs';
import { debounceTime, distinctUntilChanged } from 'rxjs/operators';
import * as i0 from "@angular/core";
export class LazyLoadDirective {
constructor(el) {
this.el = el;
// 启用懒加载，默认不启用
this.enableLazyLoad = false;
// 懒加载模式，默认列表模式
this.contentMode = 'list';
// 懒加载滚动方向
this.direction = 'vertical';
// 加载更多
this.loadMore = new EventEmitter();
// 触发懒加载的距离
this.loadFactor = 5;
}
ngOnChanges(changes) {
const element = this.target ? this.target : this.el.nativeElement;
if (changes?.enableLazyLoad) {
if (changes.enableLazyLoad.currentValue) {
const scrollEvent = fromEvent(element, 'scroll');
let scrollEventFormat = scrollEvent;
if (this.contentMode === 'list') {
scrollEventFormat = scrollEvent.pipe(debounceTime(300), distinctUntilChanged());
}
this.scrollSubscription = scrollEventFormat.subscribe((event) => this.scrollList(event));
}
else if (this.scrollSubscription) {
this.scrollSubscription.unsubscribe();
}
else {
return;
}
}
}
ngAfterViewInit() {
if (this.contentMode === 'img') {
setTimeout(() => {
const target = this.target ? this.target : this.el.nativeElement;
const mockEvent = { target };
this.scrollList(mockEvent);
});
}
}
ngOnDestroy() {
if (this.scrollSubscription) {
this.scrollSubscription.unsubscribe();
}
}
scrollList(event) {
const targetEl = event.target.scrollingElement ? event.target.scrollingElement : event.target;
const { clientWidth, clientHeight, scrollLeft, scrollTop, scrollWidth, scrollHeight } = targetEl;
if (this.contentMode === 'img') {
const rect = this.el.nativeElement.getBoundingClientRect();
const imgCondition = this.direction === 'vertical'
? rect.top >= 0 && clientHeight >= rect.top + this.loadFactor
: rect.left >= 0 && clientWidth >= rect.left + this.loadFactor;
if (imgCondition) {
if (this.imgLoadSrc) {
this.el.nativeElement.src = this.imgLoadSrc;
}
this.loadMore.emit(event);
this.scrollSubscription.unsubscribe();
}
}
else {
const etcCondition = this.direction === 'vertical'
? scrollTop !== 0 && scrollTop + clientHeight + this.loadFactor >= scrollHeight
: scrollLeft !== 0 && scrollLeft + clientWidth + this.loadFactor >= scrollWidth;
if (etcCondition) {
this.loadMore.emit(event);
}
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.13", ngImport: i0, type: LazyLoadDirective, deps: [{ token: i0.ElementRef }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.13", type: LazyLoadDirective, selector: "[dLazyLoad]", inputs: { enableLazyLoad: "enableLazyLoad", contentMode: "contentMode", target: "target", imgLoadSrc: "imgLoadSrc", direction: "direction" }, outputs: { loadMore: "loadMore" }, usesOnChanges: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.13", ngImport: i0, type: LazyLoadDirective, decorators: [{
type: Directive,
args: [{ selector: '[dLazyLoad]' }]
}], ctorParameters: () => [{ type: i0.ElementRef }], propDecorators: { enableLazyLoad: [{
type: Input
}], contentMode: [{
type: Input
}], target: [{
type: Input
}], imgLoadSrc: [{
type: Input
}], direction: [{
type: Input
}], loadMore: [{
type: Output
}] } });
//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"lazy-load.directive.js","sourceRoot":"","sources":["../../../../devui/utils/lazy-load/lazy-load.directive.ts"],"names":[],"mappings":"AAAA,OAAO,EAAiB,SAAS,EAAE,UAAU,EAAE,YAAY,EAAE,KAAK,EAAwB,MAAM,EAAiB,MAAM,eAAe,CAAC;AACvI,OAAO,EAAgB,SAAS,EAAE,MAAM,MAAM,CAAC;AAC/C,OAAO,EAAE,YAAY,EAAE,oBAAoB,EAAE,MAAM,gBAAgB,CAAC;;AAGpE,MAAM,OAAO,iBAAiB;IAmB5B,YAAoB,EAAc;QAAd,OAAE,GAAF,EAAE,CAAY;QAlBlC,cAAc;QACL,mBAAc,GAAG,KAAK,CAAC;QAChC,eAAe;QACN,gBAAW,GAAmB,MAAM,CAAC;QAK9C,UAAU;QACD,cAAS,GAA8B,UAAU,CAAC;QAC3D,OAAO;QACG,aAAQ,GAAG,IAAI,YAAY,EAAO,CAAC;QAI7C,WAAW;QACX,eAAU,GAAG,CAAC,CAAC;IAEsB,CAAC;IAEtC,WAAW,CAAC,OAAsB;QAChC,MAAM,OAAO,GAAG,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,IAAI,CAAC,EAAE,CAAC,aAAa,CAAC;QAClE,IAAI,OAAO,EAAE,cAAc,EAAE,CAAC;YAC5B,IAAI,OAAO,CAAC,cAAc,CAAC,YAAY,EAAE,CAAC;gBACxC,MAAM,WAAW,GAAG,SAAS,CAAC,OAAO,EAAE,QAAQ,CAAC,CAAC;gBACjD,IAAI,iBAAiB,GAAG,WAAW,CAAC;gBACpC,IAAI,IAAI,CAAC,WAAW,KAAK,MAAM,EAAE,CAAC;oBAChC,iBAAiB,GAAG,WAAW,CAAC,IAAI,CAAC,YAAY,CAAC,GAAG,CAAC,EAAE,oBAAoB,EAAE,CAAC,CAAC;gBAClF,CAAC;gBACD,IAAI,CAAC,kBAAkB,GAAG,iBAAiB,CAAC,SAAS,CAAC,CAAC,KAAK,EAAE,EAAE,CAAC,IAAI,CAAC,UAAU,CAAC,KAAK,CAAC,CAAC,CAAC;YAC3F,CAAC;iBAAM,IAAI,IAAI,CAAC,kBAAkB,EAAE,CAAC;gBACnC,IAAI,CAAC,kBAAkB,CAAC,WAAW,EAAE,CAAC;YACxC,CAAC;iBAAM,CAAC;gBACN,OAAO;YACT,CAAC;QACH,CAAC;IACH,CAAC;IAED,eAAe;QACb,IAAI,IAAI,CAAC,WAAW,KAAK,KAAK,EAAE,CAAC;YAC/B,UAAU,CAAC,GAAG,EAAE;gBACd,MAAM,MAAM,GAAG,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,IAAI,CAAC,EAAE,CAAC,aAAa,CAAC;gBACjE,MAAM,SAAS,GAAG,EAAE,MAAM,EAAE,CAAC;gBAC7B,IAAI,CAAC,UAAU,CAAC,SAAS,CAAC,CAAC;YAC7B,CAAC,CAAC,CAAC;QACL,CAAC;IACH,CAAC;IAED,WAAW;QACT,IAAI,IAAI,CAAC,kBAAkB,EAAE,CAAC;YAC5B,IAAI,CAAC,kBAAkB,CAAC,WAAW,EAAE,CAAC;QACxC,CAAC;IACH,CAAC;IAED,UAAU,CAAC,KAAK;QACd,MAAM,QAAQ,GAAG,KAAK,CAAC,MAAM,CAAC,gBAAgB,CAAC,CAAC,CAAC,KAAK,CAAC,MAAM,CAAC,gBAAgB,CAAC,CAAC,CAAC,KAAK,CAAC,MAAM,CAAC;QAC9F,MAAM,EAAE,WAAW,EAAE,YAAY,EAAE,UAAU,EAAE,SAAS,EAAE,WAAW,EAAE,YAAY,EAAE,GAAG,QAAQ,CAAC;QACjG,IAAI,IAAI,CAAC,WAAW,KAAK,KAAK,EAAE,CAAC;YAC/B,MAAM,IAAI,GAAG,IAAI,CAAC,EAAE,CAAC,aAAa,CAAC,qBAAqB,EAAE,CAAC;YAC3D,MAAM,YAAY,GAChB,IAAI,CAAC,SAAS,KAAK,UAAU;gBAC3B,CAAC,CAAC,IAAI,CAAC,GAAG,IAAI,CAAC,IAAI,YAAY,IAAI,IAAI,CAAC,GAAG,GAAG,IAAI,CAAC,UAAU;gBAC7D,CAAC,CAAC,IAAI,CAAC,IAAI,IAAI,CAAC,IAAI,WAAW,IAAI,IAAI,CAAC,IAAI,GAAG,IAAI,CAAC,UAAU,CAAC;YACnE,IAAI,YAAY,EAAE,CAAC;gBACjB,IAAI,IAAI,CAAC,UAAU,EAAE,CAAC;oBACpB,IAAI,CAAC,EAAE,CAAC,aAAa,CAAC,GAAG,GAAG,IAAI,CAAC,UAAU,CAAC;gBAC9C,CAAC;gBACD,IAAI,CAAC,QAAQ,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC;gBAC1B,IAAI,CAAC,kBAAkB,CAAC,WAAW,EAAE,CAAC;YACxC,CAAC;QACH,CAAC;aAAM,CAAC;YACN,MAAM,YAAY,GAChB,IAAI,CAAC,SAAS,KAAK,UAAU;gBAC3B,CAAC,CAAC,SAAS,KAAK,CAAC,IAAI,SAAS,GAAG,YAAY,GAAG,IAAI,CAAC,UAAU,IAAI,YAAY;gBAC/E,CAAC,CAAC,UAAU,KAAK,CAAC,IAAI,UAAU,GAAG,WAAW,GAAG,IAAI,CAAC,UAAU,IAAI,WAAW,CAAC;YACpF,IAAI,YAAY,EAAE,CAAC;gBACjB,IAAI,CAAC,QAAQ,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC;YAC5B,CAAC;QACH,CAAC;IACH,CAAC;+GAhFU,iBAAiB;mGAAjB,iBAAiB;;4FAAjB,iBAAiB;kBAD7B,SAAS;mBAAC,EAAE,QAAQ,EAAE,aAAa,EAAE;+EAG3B,cAAc;sBAAtB,KAAK;gBAEG,WAAW;sBAAnB,KAAK;gBAEG,MAAM;sBAAd,KAAK;gBAEG,UAAU;sBAAlB,KAAK;gBAEG,SAAS;sBAAjB,KAAK;gBAEI,QAAQ;sBAAjB,MAAM","sourcesContent":["import { AfterViewInit, Directive, ElementRef, EventEmitter, Input, OnChanges, OnDestroy, Output, SimpleChanges } from '@angular/core';\r\nimport { Subscription, fromEvent } from 'rxjs';\r\nimport { debounceTime, distinctUntilChanged } from 'rxjs/operators';\r\n\r\n@Directive({ selector: '[dLazyLoad]' })\r\nexport class LazyLoadDirective implements OnDestroy, OnChanges, AfterViewInit {\r\n  // 启用懒加载，默认不启用\r\n  @Input() enableLazyLoad = false;\r\n  // 懒加载模式，默认列表模式\r\n  @Input() contentMode: 'img' | 'list' = 'list';\r\n  // 滚动监听的目标，默认是宿主，\r\n  @Input() target: HTMLElement | Window;\r\n  // 图片懒加载模式的图片地址\r\n  @Input() imgLoadSrc: string;\r\n  // 懒加载滚动方向\r\n  @Input() direction: 'vertical' | 'horizontal' = 'vertical';\r\n  // 加载更多\r\n  @Output() loadMore = new EventEmitter<any>();\r\n\r\n  scrollSubscription: Subscription;\r\n\r\n  // 触发懒加载的距离\r\n  loadFactor = 5;\r\n\r\n  constructor(private el: ElementRef) {}\r\n\r\n  ngOnChanges(changes: SimpleChanges): void {\r\n    const element = this.target ? this.target : this.el.nativeElement;\r\n    if (changes?.enableLazyLoad) {\r\n      if (changes.enableLazyLoad.currentValue) {\r\n        const scrollEvent = fromEvent(element, 'scroll');\r\n        let scrollEventFormat = scrollEvent;\r\n        if (this.contentMode === 'list') {\r\n          scrollEventFormat = scrollEvent.pipe(debounceTime(300), distinctUntilChanged());\r\n        }\r\n        this.scrollSubscription = scrollEventFormat.subscribe((event) => this.scrollList(event));\r\n      } else if (this.scrollSubscription) {\r\n        this.scrollSubscription.unsubscribe();\r\n      } else {\r\n        return;\r\n      }\r\n    }\r\n  }\r\n\r\n  ngAfterViewInit() {\r\n    if (this.contentMode === 'img') {\r\n      setTimeout(() => {\r\n        const target = this.target ? this.target : this.el.nativeElement;\r\n        const mockEvent = { target };\r\n        this.scrollList(mockEvent);\r\n      });\r\n    }\r\n  }\r\n\r\n  ngOnDestroy() {\r\n    if (this.scrollSubscription) {\r\n      this.scrollSubscription.unsubscribe();\r\n    }\r\n  }\r\n\r\n  scrollList(event) {\r\n    const targetEl = event.target.scrollingElement ? event.target.scrollingElement : event.target;\r\n    const { clientWidth, clientHeight, scrollLeft, scrollTop, scrollWidth, scrollHeight } = targetEl;\r\n    if (this.contentMode === 'img') {\r\n      const rect = this.el.nativeElement.getBoundingClientRect();\r\n      const imgCondition =\r\n        this.direction === 'vertical'\r\n          ? rect.top >= 0 && clientHeight >= rect.top + this.loadFactor\r\n          : rect.left >= 0 && clientWidth >= rect.left + this.loadFactor;\r\n      if (imgCondition) {\r\n        if (this.imgLoadSrc) {\r\n          this.el.nativeElement.src = this.imgLoadSrc;\r\n        }\r\n        this.loadMore.emit(event);\r\n        this.scrollSubscription.unsubscribe();\r\n      }\r\n    } else {\r\n      const etcCondition =\r\n        this.direction === 'vertical'\r\n          ? scrollTop !== 0 && scrollTop + clientHeight + this.loadFactor >= scrollHeight\r\n          : scrollLeft !== 0 && scrollLeft + clientWidth + this.loadFactor >= scrollWidth;\r\n      if (etcCondition) {\r\n        this.loadMore.emit(event);\r\n      }\r\n    }\r\n  }\r\n}\r\n"]}