{"version":3,"file":"ng-mat-select-infinite-scroll.mjs","sources":["../../../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 {AfterViewInit, Directive, EventEmitter, Input, NgZone, OnDestroy, OnInit, Output} from '@angular/core';\nimport {MatSelect} from '@angular/material/select';\nimport {debounceTime, takeUntil, tap} from 'rxjs/operators';\nimport {fromEvent, 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})\nexport class MatSelectInfiniteScrollDirective implements OnInit, OnDestroy, AfterViewInit {\n\n  @Input() threshold = '15%';\n  @Input() debounceTime = 150;\n  @Input() complete!: boolean;\n  @Output() infiniteScroll = new EventEmitter<void>();\n\n  private panel!: Element;\n  private thrPx = 0;\n  private thrPc = 0;\n  private singleOptionHeight = SELECT_ITEM_HEIGHT_EM;\n\n  private destroyed$ = new Subject<boolean>();\n\n  constructor(private matSelect: MatSelect, private ngZone: NgZone) {\n  }\n\n  ngOnInit() {\n    this.evaluateThreshold();\n  }\n\n  ngAfterViewInit() {\n    this.matSelect.openedChange.pipe(\n      takeUntil(this.destroyed$)\n    ).subscribe((opened) => {\n      if (opened) {\n        this.panel = this.matSelect.panel.nativeElement;\n        this.singleOptionHeight = this.getSelectItemHeightPx();\n        this.registerScrollListener();\n      }\n    });\n  }\n\n  ngOnDestroy() {\n    this.destroyed$.next(true);\n    this.destroyed$.complete();\n  }\n\n  evaluateThreshold() {\n    if (this.threshold.lastIndexOf('%') > -1) {\n      this.thrPx = 0;\n      this.thrPc = (parseFloat(this.threshold) / 100);\n\n    } else {\n      this.thrPx = parseFloat(this.threshold);\n      this.thrPc = 0;\n    }\n  }\n\n  registerScrollListener() {\n    fromEvent(this.panel, 'scroll').pipe(\n      takeUntil(this.destroyed$),\n      debounceTime(this.debounceTime),\n      tap((event) => {\n        this.handleScrollEvent(event);\n      })\n    ).subscribe();\n  }\n\n  handleScrollEvent(event: any) {\n    this.ngZone.runOutsideAngular(() => {\n      if (this.complete) {\n        return;\n      }\n      const countOfRenderedOptions = this.matSelect.options.length;\n      const infiniteScrollDistance = this.singleOptionHeight * 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(() => this.infiniteScroll.emit());\n      }\n    });\n  }\n\n  getSelectItemHeightPx(): number {\n    return parseFloat(getComputedStyle(this.panel).fontSize) * SELECT_ITEM_HEIGHT_EM;\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. 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