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Implementation of default options (via DI) #454

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41 changes: 40 additions & 1 deletion projects/ngx-infinite-scroll/src/lib/ngx-infinite-scroll.directive.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,10 +3,13 @@ import {
Directive,
ElementRef,
EventEmitter,
Inject,
InjectionToken,
Input,
NgZone,
OnChanges,
OnDestroy,
Optional,
Output,
SimpleChanges,
} from '@angular/core';
Expand Down Expand Up @@ -40,7 +43,25 @@ export class InfiniteScrollDirective

private disposeScroller?: Subscription;

constructor(private element: ElementRef, private zone: NgZone) {}
constructor(
private element: ElementRef,
private zone: NgZone,
@Optional() @Inject(NGX_INFINITE_SCROLL_DEFAULT_OPTIONS) defaultOptions?: InfiniteScrollOptions
) {
this.applyDefaultOptions(defaultOptions);
}

private applyDefaultOptions(defaultOptions?: InfiniteScrollOptions) {
if (!defaultOptions) {
return;
}
for (const key of configurableDefaultOptions) {
if (Object.prototype.hasOwnProperty.call(defaultOptions, key)) {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(this[key] as any) = defaultOptions[key];
}
}
}

ngAfterViewInit() {
if (!this.infiniteScrollDisabled) {
Expand Down Expand Up @@ -113,3 +134,21 @@ function hasObservers<T>(emitter: EventEmitter<T>): boolean {
// not available for users running the lower version.
return emitter.observed ?? emitter.observers.length > 0;
}

export const configurableDefaultOptions = [
'infiniteScrollDistance',
'infiniteScrollUpDistance',
'infiniteScrollThrottle',
'infiniteScrollDisabled',
'infiniteScrollContainer',
'scrollWindow',
'immediateCheck',
'horizontal',
'alwaysCallback',
'fromRoot'
] satisfies Array<keyof InfiniteScrollDirective>;
export type ConfigurableDefaultOptions = typeof configurableDefaultOptions[number];

/** Global configurable options for MatSelectSearch. */
export type InfiniteScrollOptions = Readonly<Partial<Pick<InfiniteScrollDirective, ConfigurableDefaultOptions>>>;
export const NGX_INFINITE_SCROLL_DEFAULT_OPTIONS = new InjectionToken<InfiniteScrollOptions>('NGX_INFINITE_SCROLL_DEFAULT_OPTIONS');