ontimize-web-ngx
Version:
Ontimize Web framework using Angular 15
113 lines • 20.8 kB
JavaScript
import { Inject, Injectable, Optional } from "@angular/core";
import { BehaviorSubject, timer, tap, shareReplay, distinctUntilChanged, filter, map, merge, Subject, takeUntil } from "rxjs";
import { O_TABLE_GLOBAL_CONFIG } from "./utils/o-table.tokens";
import * as i0 from "@angular/core";
export class OTableLoadingService {
constructor(config) {
this.config = config;
this.loading$ = new BehaviorSubject(true);
this.THRESHOLD = 300;
this.MIN_VISIBLE = 300;
this.visibleSince = null;
this.showSkeleton$ = new BehaviorSubject(false);
this.processingBlocked$ = new BehaviorSubject(false);
this.destroy$ = new Subject();
this.isInitialLoad$ = new BehaviorSubject(true);
this.isLoading$ = this.loading$.pipe(distinctUntilChanged(), map(loading => ({ loading, shouldShow: loading })), shareReplay(1));
this.handleProcessingBlock$ = this.isLoading$.pipe(tap(state => {
const shouldBlock = state.shouldShow;
if (this.processingBlocked$.value !== shouldBlock) {
this.processingBlocked$.next(shouldBlock);
}
}));
this.isProcessing$ = this.processingBlocked$.pipe(distinctUntilChanged(), shareReplay(1));
this.handleShow$ = this.isLoading$.pipe(filter(state => state.shouldShow), tap(() => {
const threshold = this.isInitialLoad$.value ? 0 : this.THRESHOLD;
timer(threshold).subscribe(() => {
if (this.loading$.value) {
this.visibleSince = performance.now();
this.showSkeleton$.next(true);
}
});
}));
this.handleHide$ = this.isLoading$.pipe(filter(state => !state.shouldShow), tap(() => {
const now = performance.now();
if (this.isInitialLoad$.value) {
this.isInitialLoad$.next(false);
}
if (this.visibleSince !== null) {
const elapsed = now - this.visibleSince;
if (elapsed < this.MIN_VISIBLE) {
const remaining = this.MIN_VISIBLE - elapsed;
timer(remaining).subscribe(() => {
this.visibleSince = null;
this.showSkeleton$.next(false);
});
}
else {
this.visibleSince = null;
this.showSkeleton$.next(false);
}
}
}));
this.showLoading$ = merge(this.handleShow$, this.handleHide$).pipe(map(() => this.showSkeleton$.value), distinctUntilChanged(), shareReplay(1));
this.THRESHOLD = config?.loading?.threshold ?? this.THRESHOLD;
this.MIN_VISIBLE = config?.loading?.minVisible ?? this.MIN_VISIBLE;
this.handleProcessingBlock$
.pipe(takeUntil(this.destroy$))
.subscribe();
this.handleShow$
.pipe(takeUntil(this.destroy$))
.subscribe();
this.handleHide$
.pipe(takeUntil(this.destroy$))
.subscribe();
this.showLoading$ = this.showSkeleton$.pipe(takeUntil(this.destroy$), distinctUntilChanged(), shareReplay(1));
}
setLoading(value) {
if (value && this.isBlocked()) {
return;
}
if (this.loading$.value !== value) {
this.loading$.next(value);
}
}
isBlocked() {
return this.processingBlocked$.value;
}
setProcessingBlock(value) {
if (this.processingBlocked$.value !== value) {
this.processingBlocked$.next(value);
}
}
handleProtected(event) {
if (this.isBlocked()) {
if (event) {
event.preventDefault();
event.stopPropagation();
}
return false;
}
this.setLoading(true);
return true;
}
ngOnDestroy() {
this.destroy$.next(void 0);
this.destroy$.complete();
this.loading$.complete();
this.showSkeleton$.complete();
this.processingBlocked$.complete();
this.isInitialLoad$.complete();
}
}
OTableLoadingService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: OTableLoadingService, deps: [{ token: O_TABLE_GLOBAL_CONFIG, optional: true }], target: i0.ɵɵFactoryTarget.Injectable });
OTableLoadingService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: OTableLoadingService });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: OTableLoadingService, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [O_TABLE_GLOBAL_CONFIG]
}] }]; } });
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`true`: an async operation is in progress.\n     * - `false`: no loading is occurring.\n     */\n  private readonly loading$ = new BehaviorSubject(true);\n\n  /**\n   * Minimum delay (ms) required before the skeleton can be displayed.\n   * Prevents flickering when operations resolve quickly.\n   */\n  private readonly THRESHOLD: number = 300;\n\n  /**\n   * Minimum amount of time (ms) the skeleton must remain visible once shown.\n   * Ensures consistent UX when operations finish quickly.\n   */\n  private readonly MIN_VISIBLE: number = 300;\n\n  /**\n   * Timestamp indicating when the skeleton was made visible.\n   * Used to enforce the minimum visible duration.\n   */\n  private visibleSince: number | null = null;\n\n  /**\n   * Tracks the actual skeleton visibility state.\n   */\n  private readonly showSkeleton$ = new BehaviorSubject<boolean>(false);\n\n  /**\n   * Indicates whether UI interaction is blocked during processing.\n   */\n  private readonly processingBlocked$ = new BehaviorSubject<boolean>(false);\n\n  /**\n   * Emits when the service is destroyed, used to clean up subscriptions.\n   */\n  private readonly destroy$ = new Subject<void>();\n\n  private readonly isInitialLoad$ = new BehaviorSubject<boolean>(true);\n\n  constructor(\n    @Optional() @Inject(O_TABLE_GLOBAL_CONFIG) private readonly config: OTableGlobalConfig\n  ) {\n\n    // Load configurable defaults if provided\n    this.THRESHOLD = config?.loading?.threshold ?? this.THRESHOLD;\n    this.MIN_VISIBLE = config?.loading?.minVisible ?? this.MIN_VISIBLE;\n\n    this.handleProcessingBlock$\n      .pipe(takeUntil(this.destroy$))\n      .subscribe();\n\n    this.handleShow$\n      .pipe(takeUntil(this.destroy$))\n      .subscribe();\n\n    this.handleHide$\n      .pipe(takeUntil(this.destroy$))\n      .subscribe();\n\n    /**\n    * Public observable exposing whether the skeleton should be visible.\n    */\n    this.showLoading$ = this.showSkeleton$.pipe(\n      takeUntil(this.destroy$),\n      distinctUntilChanged(),\n      shareReplay(1)\n    );\n  }\n\n  private readonly isLoading$ = this.loading$.pipe(\n    distinctUntilChanged(),\n    map(loading => ({ loading, shouldShow: loading })),\n    shareReplay(1)\n  );\n\n\n  /**\n  * Internal stream that handles immediate UI blocking whenever loading starts.\n  */\n  private readonly handleProcessingBlock$ = this.isLoading$.pipe(\n    tap(state => {\n      const shouldBlock = state.shouldShow;\n\n      if (this.processingBlocked$.value !== shouldBlock) {\n        this.processingBlocked$.next(shouldBlock);\n      }\n    })\n  );\n\n  /**\n * Public observable indicating whether the UI is currently blocked.\n * Prevents users from interacting during protected operations.\n */\n  readonly isProcessing$ = this.processingBlocked$.pipe(\n    distinctUntilChanged(),\n    shareReplay(1)\n  );\n\n  /**\n     * Internal stream that manages displaying the skeleton using\n     * a non-cancelable threshold timer.\n     *\n     * If loading is still active once the threshold expires,\n     * the skeleton becomes visible.\n     */\n  private readonly handleShow$ = this.isLoading$.pipe(\n    filter(state => state.shouldShow),\n    tap(() => {\n      const threshold = this.isInitialLoad$.value ? 0 : this.THRESHOLD;\n\n      timer(threshold).subscribe(() => {\n        if (this.loading$.value) {\n          this.visibleSince = performance.now();\n          this.showSkeleton$.next(true);\n        }\n      });\n    })\n  );\n  /**\n     * Internal stream that manages hiding the skeleton while enforcing\n     * the minimum visible duration.\n     */\n  private readonly handleHide$ = this.isLoading$.pipe(\n    filter(state => !state.shouldShow),\n    tap(() => {\n      const now = performance.now();\n\n      if (this.isInitialLoad$.value) {\n        this.isInitialLoad$.next(false);\n      }\n\n      // Only enforce delay if the skeleton was actually shown\n      if (this.visibleSince !== null) {\n        const elapsed = now - this.visibleSince;\n        if (elapsed < this.MIN_VISIBLE) {\n          const remaining = this.MIN_VISIBLE - elapsed;\n          timer(remaining).subscribe(() => {\n            this.visibleSince = null;\n            this.showSkeleton$.next(false);\n          });\n        } else {\n          this.visibleSince = null;\n          this.showSkeleton$.next(false);\n        }\n      }\n    })\n  );\n  /**\n    * Combined observable for activating reactive flows.\n    * The *actual* skeleton state is controlled by `showSkeleton$`.\n    */\n  readonly showLoading$ = merge(\n    this.handleShow$,\n    this.handleHide$\n  ).pipe(\n    map(() => this.showSkeleton$.value),\n    distinctUntilChanged(),\n    shareReplay(1)\n  );\n\n  // ---------------------------------------------------------\n  // PUBLIC API METHODS\n  // ---------------------------------------------------------\n\n  /**\n   * Updates the internal loading state.\n   * Prevents enabling loading while a processing block is active.\n   *\n   * @param value Whether loading is active.\n   */\n  setLoading(value: boolean): void {\n    if (value && this.isBlocked()) {\n      return;\n    }\n    if (this.loading$.value !== value) {\n      this.loading$.next(value);\n    }\n  }\n\n  /**\n   * Returns whether the UI is currently blocked.\n   */\n  isBlocked(): boolean {\n    return this.processingBlocked$.value;\n  }\n\n  /**\n   * Manually toggles the UI processing-block state.\n   *\n   * @param value Whether the UI should be blocked.\n   */\n  setProcessingBlock(value: boolean): void {\n    if (this.processingBlocked$.value !== value) {\n      this.processingBlocked$.next(value);\n    }\n  }\n\n\n  // ---------------------------------------------------------\n  // CLICK PROTECTION\n  // ---------------------------------------------------------\n\n  /**\n   * Protects user interactions (clicks) from firing while a protected\n   * operation is already in progress.\n   *\n   * @param event Optional mouse event to stop propagation.\n   * @param operation Optional name of the operation for debugging/logs.\n   * @returns `true` if the click should be processed, otherwise `false`.\n   */\n  handleProtected(event?: MouseEvent): boolean {\n    if (this.isBlocked()) {\n      if (event) {\n        event.preventDefault();\n        event.stopPropagation();\n      }\n      return false;\n    }\n\n    this.setLoading(true);\n    return true;\n  }\n\n\n  // ---------------------------------------------------------\n  // LIFECYCLE\n  // ---------------------------------------------------------\n\n  /**\n   * Cleans up all internal subscriptions and completes streams.\n   */\n  ngOnDestroy(): void {\n    this.destroy$.next(void 0);\n    this.destroy$.complete();\n\n    this.loading$.complete();\n    this.showSkeleton$.complete();\n    this.processingBlocked$.complete();\n    this.isInitialLoad$.complete();\n  }\n\n}"]}