{"version":3,"file":"ng-mat-select-infinite-scroll.mjs","sources":["../../../projects/ng-mat-select-infinite-scroll/src/lib/infinite-scroll.service.ts","../../../projects/ng-mat-select-infinite-scroll/src/lib/mat-select-infinite-scroll.directive.ts","../../../projects/ng-mat-select-infinite-scroll/src/lib/mat-select-infinite-scroll.module.ts","../../../projects/ng-mat-select-infinite-scroll/src/public-api.ts","../../../projects/ng-mat-select-infinite-scroll/src/ng-mat-select-infinite-scroll.ts"],"sourcesContent":["import {Injectable, NgZone} from '@angular/core';\nimport {fromEvent, Subject} from 'rxjs';\nimport {debounceTime, takeUntil, tap} from 'rxjs/operators';\n\n@Injectable({\n    providedIn: 'root'\n})\nexport class InfiniteScrollService {\n\n    private threshold = '15%';\n    private debounceTime = 150;\n    private complete!: boolean;\n    private thrPx = 0;\n    private thrPc = 0;\n    private destroyed$ = new Subject<void>();\n    private selectItemHeightPx!: number;\n    private panel!: Element;\n\n    constructor(private ngZone: NgZone) {\n    }\n\n    initialize(panel: Element, selectItemHeightPx: number, config: {\n        threshold: string,\n        debounceTime: number,\n        complete: boolean\n    }) {\n        this.threshold = config.threshold;\n        this.debounceTime = config.debounceTime;\n        this.complete = config.complete;\n\n        this.panel = panel;\n        this.selectItemHeightPx = selectItemHeightPx;\n        this.evaluateThreshold();\n    }\n\n    evaluateThreshold() {\n        if (this.threshold.lastIndexOf('%') > -1) {\n            this.thrPx = 0;\n            this.thrPc = (parseFloat(this.threshold) / 100);\n        } else {\n            this.thrPx = parseFloat(this.threshold);\n            this.thrPc = 0;\n        }\n    }\n\n    registerScrollListener(infiniteScrollCallback: () => void) {\n        fromEvent(this.panel, 'scroll').pipe(\n            takeUntil(this.destroyed$),\n            debounceTime(this.debounceTime),\n            tap((event) => {\n                this.handleScrollEvent(event, infiniteScrollCallback);\n            })\n        ).subscribe();\n    }\n\n    handleScrollEvent(event: any, infiniteScrollCallback: () => void) {\n        this.ngZone.runOutsideAngular(() => {\n            if (this.complete) {\n                return;\n            }\n            const countOfRenderedOptions = Math.round(this.panel.scrollHeight / this.selectItemHeightPx);\n            const infiniteScrollDistance = this.selectItemHeightPx * countOfRenderedOptions;\n            const threshold = this.thrPc !== 0 ? (infiniteScrollDistance * this.thrPc) : this.thrPx;\n\n            const scrolledDistance = this.panel.clientHeight + event.target.scrollTop;\n\n            if ((scrolledDistance + threshold) >= infiniteScrollDistance) {\n                this.ngZone.run(infiniteScrollCallback);\n            }\n        });\n    }\n\n    destroy() {\n        this.destroyed$.next();\n        this.destroyed$.complete();\n    }\n}\n","import {AfterViewInit, Directive, EventEmitter, Input, NgZone, OnDestroy, OnInit, Output} from '@angular/core';\nimport {MatSelect} from '@angular/material/select';\nimport {delay, takeUntil} from 'rxjs/operators';\nimport {InfiniteScrollService} from \"./infinite-scroll.service\";\nimport {Subject} from \"rxjs\";\n\n/** The height of the select items in `em` units. */\nconst SELECT_ITEM_HEIGHT_EM = 3;\n\n@Directive({\n    selector: '[msInfiniteScroll]',\n    providers: [InfiniteScrollService]\n})\nexport class MatSelectInfiniteScrollDirective implements OnDestroy, AfterViewInit {\n\n    @Input() threshold = '15%';\n    @Input() debounceTime = 150;\n    @Input() complete!: boolean;\n    @Output() infiniteScroll = new EventEmitter<void>();\n\n    private destroyed$ = new Subject<boolean>();\n\n    constructor(protected matSelect: MatSelect, private infiniteScrollService: InfiniteScrollService) {\n    }\n\n\n    ngAfterViewInit() {\n        this.matSelect.openedChange.pipe(\n            //Wait for the panel to be rendered (https://github.com/angular/components/issues/30596)\n            delay(0),\n            takeUntil(this.destroyed$)\n        ).subscribe((opened) => {\n            if (opened) {\n                const panel = this.matSelect.panel.nativeElement;\n                const selectItemHeightPx = this.getSelectItemHeightPx(panel);\n                this.infiniteScrollService.initialize(panel, selectItemHeightPx, {\n                    threshold: this.threshold,\n                    debounceTime: this.debounceTime,\n                    complete: this.complete\n                });\n\n                this.infiniteScrollService.registerScrollListener(() => this.infiniteScroll.emit());\n            }\n        });\n    }\n\n    getSelectItemHeightPx(panel: Element): number {\n        return parseFloat(getComputedStyle(panel).fontSize) * SELECT_ITEM_HEIGHT_EM;\n    }\n\n    ngOnDestroy() {\n        this.destroyed$.next(true);\n        this.destroyed$.complete();\n\n        this.infiniteScrollService.destroy();\n    }\n\n}\n","import {NgModule} from '@angular/core';\nimport {MatSelectInfiniteScrollDirective} from './mat-select-infinite-scroll.directive';\nimport {MatSelectModule} from '@angular/material/select';\n\n@NgModule({\n    declarations: [MatSelectInfiniteScrollDirective],\n    imports: [\n        MatSelectModule,\n    ],\n    exports: [MatSelectInfiniteScrollDirective]\n})\nexport class MatSelectInfiniteScrollModule {\n}\n","/*\n * Public API Surface of ng-mat-select-infinite-scroll\n */\n\nexport * from './lib/mat-select-infinite-scroll.directive';\nexport * from './lib/mat-select-infinite-scroll.module';\n","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from 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