ngx-suspense
Version:
This library is an experimetnal implementation of React Suspense for Angular.
165 lines • 19.8 kB
JavaScript
var NgxSuspenseListComponent_1;
import { __decorate } from "tslib";
import { Component, Input, ContentChildren, } from "@angular/core";
import { NgxSuspenseComponent } from "./ngx-suspense.component";
import { combineLatest, BehaviorSubject, } from "rxjs";
import { filter, skip, pairwise, tap } from "rxjs/operators";
let NgxSuspenseListComponent = NgxSuspenseListComponent_1 = class NgxSuspenseListComponent {
constructor() {
this.revealOrder = "*";
this.subs = [];
this.allBroadcasters = [];
this.allListeners = [];
this.hasParentControlSubject = new BehaviorSubject(undefined);
this.parentControl$ = this.hasParentControlSubject.asObservable();
}
ngOnInit() {
this.parentControl$
.pipe(tap((val) => {
console.log("release", val);
}))
.subscribe();
}
ngAfterContentInit() {
this.allBroadcasters = this.skeletons.map((s) => s.loading$);
this.allListeners = this.skeletons.map((s) => this.hideSkeletonListener(s));
this.revealOrderOperator(this.revealOrder);
}
ngOnChanges(changes) {
if (changes.revealOrder) {
this.revealOrderOperator(changes.revealOrder.currentValue);
}
}
ngOnDestroy() {
if (this.subs.length) {
this.subs.forEach((sub) => sub.unsubscribe());
this.subs.length = 0;
}
}
reload(order) {
this.revealOrderOperator(order || this.revealOrder);
}
show() { }
hide() { }
revealOrderOperator(order) {
if (this.allBroadcasters.length === 0 || this.allListeners.length === 0) {
return;
}
if (this.subs.length) {
this.subs.forEach((sub) => sub.unsubscribe());
this.subs.length = 0;
}
switch (order) {
case "together": {
const sub = this.togetherOperator(this.allBroadcasters)(this.allListeners);
this.subs.push(sub);
break;
}
case "forwards": {
const subs = this.domOrderOperator(this.allBroadcasters)(this.allListeners);
this.subs = subs;
break;
}
case "backwards": {
const broadcasters = [...this.allBroadcasters].reverse();
const listeners = [...this.allListeners].reverse();
const subs = this.domOrderOperator(broadcasters)(listeners);
this.subs = subs;
break;
}
default:
// nothing should happen
}
}
hideSkeletonListener(skeleton) {
return () => {
skeleton.hide();
};
}
showSkeletonListener(skeleton) {
return () => {
skeleton.show();
};
}
togetherOperator(broadcasters) {
this.skeletons.forEach((s) => this.showSkeletonListener(s)());
return (listeners) => {
return combineLatest([...broadcasters])
.pipe(
// skip default
skip(1),
// keep tracking previous value
pairwise(), filter(([ary1, ary2]) => {
// any loading state is ture
const cond1 = ary1.some((b) => b);
// all loading state is false
const cond2 = !ary2.some((b) => b);
// pass only when prev loading state is ture, current is false
return cond1 && cond2;
}))
.subscribe(() => {
listeners.forEach((hide) => hide());
});
};
}
domOrderOperator(broadcasters) {
this.skeletons.forEach((s) => this.showSkeletonListener(s)());
return (listeners) => {
let subs = [];
let checks = [...new Array(broadcasters.length)].fill(null);
broadcasters.forEach((boradcaster, index) => {
subs.push(boradcaster
.pipe(
// skip default
skip(1),
// keep tracking previous value
pairwise(), filter(([b1, b2]) => {
// pass only when prev loading state is ture, current is false
return b1 && !b2;
}))
.subscribe(() => {
checks[index] = true;
const indexesToFlush = this.getFlushIndexes(checks);
for (let i of indexesToFlush) {
listeners[i]();
}
}));
});
return subs;
};
}
getFlushIndexes(checks) {
const indexesToFlush = [];
for (let i = 0; i < checks.length; i++) {
if (indexesToFlush.indexOf(i) > -1) {
continue;
}
const check = checks[i];
if (check !== null) {
indexesToFlush.push(i);
}
else {
break;
}
}
return indexesToFlush;
}
};
__decorate([
Input()
], NgxSuspenseListComponent.prototype, "revealOrder", void 0);
__decorate([
ContentChildren(NgxSuspenseComponent)
], NgxSuspenseListComponent.prototype, "skeletons", void 0);
__decorate([
ContentChildren(NgxSuspenseListComponent_1)
], NgxSuspenseListComponent.prototype, "list", void 0);
NgxSuspenseListComponent = NgxSuspenseListComponent_1 = __decorate([
Component({
selector: "SuspenseList",
template: "<ng-content></ng-content>\n",
exportAs: "list"
})
], NgxSuspenseListComponent);
export { NgxSuspenseListComponent };
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{\n  Component,\n  Input,\n  AfterContentInit,\n  ContentChildren,\n  QueryList,\n  SimpleChanges,\n  OnDestroy,\n} from \"@angular/core\";\nimport { NgxSuspenseComponent } from \"./ngx-suspense.component\";\nimport {\n  combineLatest,\n  Subscription,\n  Subject,\n  BehaviorSubject,\n  Observable,\n} from \"rxjs\";\nimport { filter, skip, pairwise, tap, startWith } from \"rxjs/operators\";\n\ntype ORDERS = \"*\" | \"together\" | \"forwards\" | \"backwards\";\n\n@Component({\n  selector: \"SuspenseList\",\n  templateUrl: \"./ngx-suspense-list.component.html\",\n  exportAs: \"list\",\n})\nexport class NgxSuspenseListComponent implements AfterContentInit, OnDestroy {\n  @Input() revealOrder: ORDERS = \"*\";\n  @ContentChildren(NgxSuspenseComponent) skeletons: QueryList<\n    NgxSuspenseComponent\n  >;\n  @ContentChildren(NgxSuspenseListComponent) list: QueryList<\n    NgxSuspenseListComponent\n  >;\n  loading$: Observable<boolean>;\n  subs: Array<Subscription> = [];\n  allBroadcasters = [];\n  allListeners = [];\n\n  private hasParentControlSubject = new BehaviorSubject(undefined);\n  private parentControl$ = this.hasParentControlSubject.asObservable();\n\n  ngOnInit() {\n    this.parentControl$\n      .pipe(\n        tap((val) => {\n          console.log(\"release\", val);\n        })\n      )\n      .subscribe();\n  }\n\n  ngAfterContentInit() {\n    this.allBroadcasters = this.skeletons.map((s) => s.loading$);\n    this.allListeners = this.skeletons.map((s) => this.hideSkeletonListener(s));\n    this.revealOrderOperator(this.revealOrder);\n  }\n\n  ngOnChanges(changes: SimpleChanges) {\n    if (changes.revealOrder) {\n      this.revealOrderOperator(changes.revealOrder.currentValue);\n    }\n  }\n\n  ngOnDestroy() {\n    if (this.subs.length) {\n      this.subs.forEach((sub) => sub.unsubscribe());\n      this.subs.length = 0;\n    }\n  }\n\n  reload(order) {\n    this.revealOrderOperator(order || this.revealOrder);\n  }\n\n  show() {}\n\n  hide() {}\n\n  private revealOrderOperator(order: ORDERS) {\n    if (this.allBroadcasters.length === 0 || this.allListeners.length === 0) {\n      return;\n    }\n\n    if (this.subs.length) {\n      this.subs.forEach((sub) => sub.unsubscribe());\n      this.subs.length = 0;\n    }\n    switch (order) {\n      case \"together\": {\n        const sub = this.togetherOperator(this.allBroadcasters)(\n          this.allListeners\n        );\n        this.subs.push(sub);\n        break;\n      }\n      case \"forwards\": {\n        const subs = this.domOrderOperator(this.allBroadcasters)(\n          this.allListeners\n        );\n        this.subs = subs;\n        break;\n      }\n      case \"backwards\": {\n        const broadcasters = [...this.allBroadcasters].reverse();\n        const listeners = [...this.allListeners].reverse();\n        const subs = this.domOrderOperator(broadcasters)(listeners);\n        this.subs = subs;\n        break;\n      }\n      default:\n\n      // nothing should happen\n    }\n  }\n\n  private hideSkeletonListener(\n    skeleton: NgxSuspenseComponent | NgxSuspenseListComponent\n  ) {\n    return () => {\n      skeleton.hide();\n    };\n  }\n\n  private showSkeletonListener(\n    skeleton: NgxSuspenseComponent | NgxSuspenseListComponent\n  ) {\n    return () => {\n      skeleton.show();\n    };\n  }\n\n  private togetherOperator(broadcasters) {\n    this.skeletons.forEach((s) => this.showSkeletonListener(s)());\n    return (listeners) => {\n      return combineLatest([...broadcasters])\n        .pipe(\n          // skip default\n          skip(1),\n          // keep tracking previous value\n          pairwise(),\n          filter(([ary1, ary2]) => {\n            // any loading state is ture\n            const cond1 = ary1.some((b) => b);\n            // all loading state is false\n            const cond2 = !ary2.some((b) => b);\n            // pass only when prev loading state is ture, current is false\n            return cond1 && cond2;\n          })\n        )\n        .subscribe(() => {\n          listeners.forEach((hide: any) => hide());\n        });\n    };\n  }\n\n  private domOrderOperator(broadcasters) {\n    this.skeletons.forEach((s) => this.showSkeletonListener(s)());\n    return (listeners) => {\n      let subs = [];\n      let checks = [...new Array(broadcasters.length)].fill(null);\n      broadcasters.forEach((boradcaster, index) => {\n        subs.push(\n          boradcaster\n            .pipe(\n              // skip default\n              skip(1),\n              // keep tracking previous value\n              pairwise(),\n              filter(([b1, b2]) => {\n                // pass only when prev loading state is ture, current is false\n                return b1 && !b2;\n              })\n            )\n            .subscribe(() => {\n              checks[index] = true;\n              const indexesToFlush = this.getFlushIndexes(checks);\n              for (let i of indexesToFlush) {\n                listeners[i]();\n              }\n            })\n        );\n      });\n      return subs;\n    };\n  }\n\n  private getFlushIndexes(checks) {\n    const indexesToFlush = [];\n    for (let i = 0; i < checks.length; i++) {\n      if (indexesToFlush.indexOf(i) > -1) {\n        continue;\n      }\n      const check = checks[i];\n      if (check !== null) {\n        indexesToFlush.push(i);\n      } else {\n        break;\n      }\n    }\n\n    return indexesToFlush;\n  }\n}\n"]}