@tots/ngx-drag-scroll/fesm2020/tots-ngx-drag-scroll.mjs.map

Lightweight drag to scroll library for Angular

{"version":3,"file":"tots-ngx-drag-scroll.mjs","sources":["../../../projects/ngx-drag-scroll/src/lib/ngx-drag-scroll-item.ts","../../../projects/ngx-drag-scroll/src/lib/ngx-drag-scroll.component.ts","../../../projects/ngx-drag-scroll/src/lib/ngx-drag-scroll.module.ts","../../../projects/ngx-drag-scroll/src/public-api.ts","../../../projects/ngx-drag-scroll/src/tots-ngx-drag-scroll.ts"],"sourcesContent":["import { Directive, ElementRef, Input, HostBinding, Inject } from '@angular/core';\n\n@Directive({\n  selector: '[drag-scroll-item]'\n})\nexport class DragScrollItemDirective {\n  @HostBinding('style.display')\n  display = 'inline-block';\n\n  @Input('drag-disabled')\n  get dragDisabled() { return this._dragDisabled; }\n  set dragDisabled(value: boolean) { this._dragDisabled = value; }\n\n  _dragDisabled = false;\n\n  _elementRef: ElementRef;\n\n  constructor(\n    @Inject(ElementRef) elementRef: ElementRef,\n  ) {\n    this._elementRef = elementRef;\n  }\n}\n","import {\n  ElementRef,\n  Component,\n  Renderer2,\n  OnDestroy,\n  Input,\n  Output,\n  AfterViewInit,\n  OnChanges,\n  EventEmitter,\n  ViewChild,\n  ContentChildren,\n  AfterViewChecked,\n  QueryList,\n  Inject,\n  HostBinding,\n  HostListener\n} from '@angular/core';\nimport { DOCUMENT } from '@angular/common';\n\nimport { DragScrollItemDirective } from './ngx-drag-scroll-item';\n\n@Component({\n  selector: 'drag-scroll',\n  template: `\n    <div class=\"drag-scroll-content\" #contentRef>\n      <ng-content></ng-content>\n    </div>\n  `,\n  styles: [`\n    :host {\n      overflow: hidden;\n      display: block;\n    }\n    .drag-scroll-content {\n      height: 100%;\n      overflow: auto;\n      white-space: nowrap;\n    }\n    `]\n})\nexport class DragScrollComponent implements OnDestroy, AfterViewInit, OnChanges, AfterViewChecked {\n  private _index = 0;\n\n  private _scrollbarHidden = false;\n\n  private _disabled = false;\n\n  private _xDisabled = false;\n\n  private _xWheelEnabled = false;\n\n  private _yDisabled = false;\n\n  private _dragDisabled = false;\n\n  private _snapDisabled = false;\n\n  private _snapOffset = 0;\n\n  private _snapDuration = 500;\n\n  private _isDragging = false;\n\n  private _onMouseMoveListener: Function;\n\n  private _onMouseUpListener: Function;\n\n  private _onMouseDownListener: Function;\n\n  private _onScrollListener: Function;\n\n  private _onDragStartListener: Function;\n\n  /**\n   * Is the user currently pressing the element\n   */\n  isPressed = false;\n\n  /**\n   * Is the user currently scrolling the element\n   */\n  isScrolling = false;\n\n  scrollTimer: number | NodeJS.Timer = -1;\n\n  scrollToTimer: number | NodeJS.Timer = -1;\n\n  /**\n   * Is the user currently dragging the element\n   */\n  get isDragging(): boolean {\n    return this._isDragging;\n  }\n\n  /**\n   * The x coordinates on the element\n   */\n  downX = 0;\n\n  /**\n   * The y coordinates on the element\n   */\n  downY = 0;\n\n  displayType: string | null = 'block';\n\n  elWidth: string | null = null;\n\n  elHeight: string | null = null;\n\n  /**\n   * The parentNode of carousel Element\n   */\n  parentNode: HTMLElement;\n\n  /**\n   * The carousel Element\n   */\n\n  @ViewChild('contentRef', { static: true }) _contentRef: ElementRef;\n\n  @ContentChildren(DragScrollItemDirective, { descendants: true }) _children: QueryList<DragScrollItemDirective>;\n\n  @HostBinding('style.pointer-events') _pointerEvents = 'auto';\n\n  wrapper: HTMLDivElement | null;\n\n  scrollbarWidth: string | null = null;\n\n  get currIndex() { return this._index; }\n  set currIndex(value) {\n    if (value !== this._index) {\n      this._index = value;\n      this.indexChanged.emit(value);\n    }\n  }\n\n  isAnimating = false;\n\n  prevChildrenLength = 0;\n\n  indexBound = 0;\n\n  rtl = false;\n\n  @Output() dsInitialized = new EventEmitter<void>();\n\n  @Output() indexChanged = new EventEmitter<number>();\n\n  @Output() reachesLeftBound = new EventEmitter<boolean>();\n\n  @Output() reachesRightBound = new EventEmitter<boolean>();\n\n  @Output() snapAnimationFinished = new EventEmitter<number>();\n\n  @Output() dragStart = new EventEmitter<void>();\n\n  @Output() dragEnd = new EventEmitter<void>();\n\n  /**\n   * Whether the scrollbar is hidden\n   */\n  @Input('scrollbar-hidden')\n  get scrollbarHidden() { return this._scrollbarHidden; }\n  set scrollbarHidden(value: boolean) { this._scrollbarHidden = value; }\n\n  /**\n   * Whether horizontally and vertically draging and scrolling is be disabled\n   */\n  @Input('drag-scroll-disabled')\n  get disabled() { return this._disabled; }\n  set disabled(value: boolean) { this._disabled = value; }\n\n  /**\n   * Whether horizontally dragging and scrolling is be disabled\n   */\n  @Input('drag-scroll-x-disabled')\n  get xDisabled() { return this._xDisabled; }\n  set xDisabled(value: boolean) { this._xDisabled = value; }\n\n  /**\n   * Whether vertically dragging and scrolling events is disabled\n   */\n  @Input('drag-scroll-y-disabled')\n  get yDisabled() { return this._yDisabled; }\n  set yDisabled(value: boolean) { this._yDisabled = value; }\n\n  /**\n   * Whether scrolling horizontally with mouse wheel is enabled\n   */\n  @Input('scroll-x-wheel-enabled')\n  get xWheelEnabled() { return this._xWheelEnabled; }\n  set xWheelEnabled(value: boolean) { this._xWheelEnabled = value; }\n\n  @Input('drag-disabled')\n  get dragDisabled() { return this._dragDisabled; }\n  set dragDisabled(value: boolean) { this._dragDisabled = value; }\n\n  @Input('snap-disabled')\n  get snapDisabled() { return this._snapDisabled; }\n  set snapDisabled(value: boolean) { this._snapDisabled = value; }\n\n  @Input('snap-offset')\n  get snapOffset() { return this._snapOffset; }\n  set snapOffset(value: number) { this._snapOffset = value; }\n\n  @Input('snap-duration')\n  get snapDuration() { return this._snapDuration; }\n  set snapDuration(value: number) { this._snapDuration = value; }\n\n  constructor(\n    @Inject(ElementRef) private _elementRef: ElementRef,\n    @Inject(Renderer2) private _renderer: Renderer2,\n    @Inject(DOCUMENT) private _document: any\n  ) {\n    this.scrollbarWidth = `${this.getScrollbarWidth()}px`;\n  }\n\n  ngOnChanges() {\n    this.setScrollBar();\n\n    if (this.xDisabled || this.disabled || this._scrollbarHidden) {\n      this.disableScroll('x');\n    } else {\n      this.enableScroll('x');\n    }\n\n    if (this.yDisabled || this.disabled) {\n      this.disableScroll('y');\n    } else {\n      this.enableScroll('y');\n    }\n  }\n\n  ngAfterViewInit() {\n    // auto assign computed css\n    this._renderer.setAttribute(this._contentRef.nativeElement, 'drag-scroll', 'true');\n\n    this.displayType = typeof window !== 'undefined' ? window.getComputedStyle(this._elementRef.nativeElement).display : 'block';\n\n    this._renderer.setStyle(this._contentRef.nativeElement, 'display', this.displayType);\n    this._renderer.setStyle(this._contentRef.nativeElement, 'whiteSpace', 'noWrap');\n\n    // store ele width height for later user\n    this.markElDimension();\n\n    this._renderer.setStyle(this._contentRef.nativeElement, 'width', this.elWidth);\n    this._renderer.setStyle(this._contentRef.nativeElement, 'height', this.elHeight);\n\n    if (this.wrapper) {\n      this.checkScrollbar();\n    }\n\n    this._onMouseDownListener = this._renderer.listen(this._contentRef.nativeElement, 'mousedown', this.onMouseDownHandler.bind(this));\n    this._onScrollListener = this._renderer.listen(this._contentRef.nativeElement, 'scroll', this.onScrollHandler.bind(this));\n    // prevent Firefox from dragging images\n    this._onDragStartListener = this._renderer.listen(this._contentRef.nativeElement, 'dragstart', (e) => {\n      e.preventDefault();\n    });\n    this.checkNavStatus();\n    this.dsInitialized.emit();\n    this.adjustMarginToLastChild();\n\n    this.rtl = getComputedStyle(this._contentRef.nativeElement).getPropertyValue('direction') === 'rtl';\n  }\n\n  ngAfterViewChecked() {\n    // avoid extra checks\n    if (this._children.length !== this.prevChildrenLength) {\n      this.markElDimension();\n      this.checkScrollbar();\n      this.prevChildrenLength = this._children.length;\n      this.checkNavStatus();\n    }\n  }\n\n  ngOnDestroy() {\n    this._renderer.setAttribute(this._contentRef.nativeElement, 'drag-scroll', 'false');\n    if (this._onMouseDownListener) {\n      this._onMouseDownListener = this._onMouseDownListener();\n    }\n    if (this._onScrollListener) {\n      this._onScrollListener = this._onScrollListener();\n    }\n    if (this._onDragStartListener) {\n      this._onDragStartListener = this._onDragStartListener();\n    }\n  }\n\n  onMouseMoveHandler(event: MouseEvent) {\n    this.onMouseMove(event);\n  }\n\n  onMouseMove(event: MouseEvent) {\n    if (event.clientX === this.downX && event.clientY === this.downY) {\n      // Ignore 'mousemove\" event triggered at the same coordinates that the last mousedown event (consequence of window resize)\n      return;\n    }\n    if (this.isPressed && !this.disabled) {\n      // Workaround for prevent scroll stuck if browser lost focus\n      // MouseEvent.buttons not support by Safari\n      // eslint-disable-next-line import/no-deprecated\n      if (!event.buttons && !event.which) {\n        return this.onMouseUpHandler(event);\n      }\n\n      this._pointerEvents = 'none';\n      this._setIsDragging(true);\n\n      // Drag X\n      if (!this.xDisabled && !this.dragDisabled) {\n        const clientX = (event as MouseEvent).clientX;\n        this._contentRef.nativeElement.scrollLeft =\n          this._contentRef.nativeElement.scrollLeft - clientX + this.downX;\n        this.downX = clientX;\n      }\n\n      // Drag Y\n      if (!this.yDisabled && !this.dragDisabled) {\n        const clientY = (event as MouseEvent).clientY;\n        this._contentRef.nativeElement.scrollTop =\n          this._contentRef.nativeElement.scrollTop - clientY + this.downY;\n        this.downY = clientY;\n      }\n    }\n  }\n\n  onMouseDownHandler(event: MouseEvent) {\n    const dragScrollItem: DragScrollItemDirective | null = this.locateDragScrollItem(event.target as Element);\n    if (dragScrollItem && dragScrollItem.dragDisabled) {\n      return;\n    }\n\n    const isTouchEvent = event.type === 'touchstart';\n\n    this._startGlobalListening(isTouchEvent);\n    this.isPressed = true;\n\n    const mouseEvent = event as MouseEvent;\n    this.downX = mouseEvent.clientX;\n    this.downY = mouseEvent.clientY;\n\n    clearTimeout(this.scrollToTimer as number);\n  }\n\n  onScrollHandler() {\n    this.checkNavStatus();\n    if (!this.isPressed && !this.isAnimating && !this.snapDisabled) {\n      this.isScrolling = true;\n      clearTimeout(this.scrollTimer as number);\n      this.scrollTimer = setTimeout(() => {\n        this.isScrolling = false;\n        this.locateCurrentIndex(true);\n      }, 500);\n    } else {\n      this.locateCurrentIndex();\n    }\n  }\n\n  onMouseUpHandler(event: MouseEvent) {\n    if (this.isPressed) {\n      this.isPressed = false;\n      this._pointerEvents = 'auto';\n      this._setIsDragging(false);\n      if (!this.snapDisabled) {\n        this.locateCurrentIndex(true);\n      } else {\n        this.locateCurrentIndex();\n      }\n      this._stopGlobalListening();\n    }\n  }\n\n  /*\n   * Nav button\n   */\n  moveLeft() {\n    if ((this.currIndex !== 0 || this.snapDisabled)) {\n      this.currIndex--;\n      clearTimeout(this.scrollToTimer as number);\n      this.scrollTo(this._contentRef.nativeElement, this.toChildrenLocation(), this.snapDuration);\n    }\n  }\n\n  moveRight() {\n    const container = this.wrapper || this.parentNode;\n    const containerWidth = container ? container.clientWidth : 0;\n\n    if (!this.isScrollReachesRightEnd() && this.currIndex < this.maximumIndex(containerWidth, this._children.toArray())) {\n      this.currIndex++;\n      clearTimeout(this.scrollToTimer as number);\n      this.scrollTo(this._contentRef.nativeElement, this.toChildrenLocation(), this.snapDuration);\n    }\n  }\n\n  moveTo(index: number) {\n    const container = this.wrapper || this.parentNode;\n    const containerWidth = container ? container.clientWidth : 0;\n    if (\n      index >= 0 &&\n      index !== this.currIndex &&\n      this.currIndex <= this.maximumIndex(containerWidth, this._children.toArray())\n    ) {\n      this.currIndex = Math.min(index, this.maximumIndex(containerWidth, this._children.toArray()));\n      clearTimeout(this.scrollToTimer as number);\n      this.scrollTo(this._contentRef.nativeElement, this.toChildrenLocation(), this.snapDuration);\n    }\n  }\n\n  checkNavStatus() {\n    setTimeout(() => {\n      const onlyOneItem = Boolean(this._children.length <= 1);\n      const containerIsLargerThanContent = Boolean(this._contentRef.nativeElement.scrollWidth <=\n        this._contentRef.nativeElement.clientWidth);\n      if (onlyOneItem || containerIsLargerThanContent) {\n        // only one element\n        this.reachesLeftBound.emit(true);\n        this.reachesRightBound.emit(true);\n      } else if (this.isScrollReachesRightEnd()) {\n        // reached right end\n        this.reachesLeftBound.emit(false);\n        this.reachesRightBound.emit(true);\n      } else if (this._contentRef.nativeElement.scrollLeft === 0 &&\n        this._contentRef.nativeElement.scrollWidth > this._contentRef.nativeElement.clientWidth) {\n        // reached left end\n        this.reachesLeftBound.emit(true);\n        this.reachesRightBound.emit(false);\n      } else {\n        // in the middle\n        this.reachesLeftBound.emit(false);\n        this.reachesRightBound.emit(false);\n      }\n    }, 0);\n  }\n\n  @HostListener('wheel', ['$event'])\n  public onWheel(event: WheelEvent) {\n    if (this._xWheelEnabled) {\n      event.preventDefault();\n\n      if (this._snapDisabled) {\n        this._contentRef.nativeElement.scrollBy(event.deltaY, 0);\n      } else {\n        if (event.deltaY < 0) {\n          this.moveLeft();\n        } else if (event.deltaY > 0) {\n          this.moveRight();\n        }\n      }\n    }\n  }\n\n  @HostListener('window:resize')\n  public onWindowResize() {\n    this.refreshWrapperDimensions();\n    this.checkNavStatus();\n  }\n\n  private _setIsDragging(value: boolean) {\n    if (this._isDragging === value) {\n      return;\n    }\n\n    this._isDragging = value;\n    value ? this.dragStart.emit() : this.dragEnd.emit();\n  }\n\n  private _startGlobalListening(isTouchEvent: boolean) {\n    if (!this._onMouseMoveListener) {\n      const eventName = isTouchEvent ? 'touchmove' : 'mousemove';\n      this._onMouseMoveListener = this._renderer.listen('document', eventName, this.onMouseMoveHandler.bind(this));\n    }\n\n    if (!this._onMouseUpListener) {\n      const eventName = isTouchEvent ? 'touchend' : 'mouseup';\n      this._onMouseUpListener = this._renderer.listen('document', eventName, this.onMouseUpHandler.bind(this));\n    }\n  }\n\n  private _stopGlobalListening() {\n    if (this._onMouseMoveListener) {\n      this._onMouseMoveListener = this._onMouseMoveListener();\n    }\n\n    if (this._onMouseUpListener) {\n      this._onMouseUpListener = this._onMouseUpListener();\n    }\n  }\n\n  private disableScroll(axis: string): void {\n    this._renderer.setStyle(this._contentRef.nativeElement, `overflow-${axis}`, 'hidden');\n  }\n\n  private enableScroll(axis: string): void {\n    this._renderer.setStyle(this._contentRef.nativeElement, `overflow-${axis}`, 'auto');\n  }\n\n  private hideScrollbar(): void {\n    if (this._contentRef.nativeElement.style.display !== 'none' && !this.wrapper) {\n      this.parentNode = this._contentRef.nativeElement.parentNode;\n\n      // create container element\n      this.wrapper = this._renderer.createElement('div');\n      this._renderer.setAttribute(this.wrapper, 'class', 'drag-scroll-wrapper');\n      this._renderer.addClass(this.wrapper, 'drag-scroll-container');\n\n      this.refreshWrapperDimensions();\n\n      this._renderer.setStyle(this.wrapper, 'overflow', 'hidden');\n\n      this._renderer.setStyle(this._contentRef.nativeElement, 'width', `calc(100% + ${this.scrollbarWidth})`);\n      this._renderer.setStyle(this._contentRef.nativeElement, 'height', `calc(100% + ${this.scrollbarWidth})`);\n\n      // Append container element to component element.\n      this._renderer.appendChild(this._elementRef.nativeElement, this.wrapper);\n\n      // Append content element to container element.\n      this._renderer.appendChild(this.wrapper, this._contentRef.nativeElement);\n\n      this.adjustMarginToLastChild();\n    }\n  }\n\n  private showScrollbar(): void {\n    if (this.wrapper) {\n      this._renderer.setStyle(this._contentRef.nativeElement, 'width', '100%');\n      this._renderer.setStyle(this._contentRef.nativeElement, 'height', this.wrapper.style.height);\n      if (this.parentNode !== null) {\n        this.parentNode.removeChild(this.wrapper);\n        this.parentNode.appendChild(this._contentRef.nativeElement);\n      }\n      this.wrapper = null;\n\n      this.adjustMarginToLastChild();\n    }\n  }\n\n  private checkScrollbar() {\n    if (this._contentRef.nativeElement.scrollWidth <= this._contentRef.nativeElement.clientWidth) {\n      this._renderer.setStyle(this._contentRef.nativeElement, 'height', '100%');\n    } else {\n      this._renderer.setStyle(this._contentRef.nativeElement, 'height', `calc(100% + ${this.scrollbarWidth})`);\n    }\n    if (this._contentRef.nativeElement.scrollHeight <= this._contentRef.nativeElement.clientHeight) {\n      this._renderer.setStyle(this._contentRef.nativeElement, 'width', '100%');\n    } else {\n      this._renderer.setStyle(this._contentRef.nativeElement, 'width', `calc(100% + ${this.scrollbarWidth})`);\n    }\n  }\n\n  private setScrollBar(): void {\n    if (this.scrollbarHidden) {\n      this.hideScrollbar();\n    } else {\n      this.showScrollbar();\n    }\n  }\n\n  private getScrollbarWidth(): number {\n    /**\n     * Browser Scrollbar Widths (2016)\n     * OSX (Chrome, Safari, Firefox) - 15px\n     * Windows XP (IE7, Chrome, Firefox) - 17px\n     * Windows 7 (IE10, IE11, Chrome, Firefox) - 17px\n     * Windows 8.1 (IE11, Chrome, Firefox) - 17px\n     * Windows 10 (IE11, Chrome, Firefox) - 17px\n     * Windows 10 (Edge 12/13) - 12px\n     */\n    const outer = this._renderer.createElement('div');\n    this._renderer.setStyle(outer, 'visibility', 'hidden');\n    this._renderer.setStyle(outer, 'width', '100px');\n    this._renderer.setStyle(outer, 'msOverflowStyle', 'scrollbar');  // needed for WinJS apps\n    // document.body.appendChild(outer);\n    this._renderer.appendChild(this._document.body, outer);\n    // this._renderer.appendChild(this._renderer.selectRootElement('body'), outer);\n    const widthNoScroll = outer.offsetWidth;\n    // force scrollbars\n    this._renderer.setStyle(outer, 'overflow', 'scroll');\n\n    // add innerdiv\n    const inner = this._renderer.createElement('div');\n    this._renderer.setStyle(inner, 'width', '100%');\n    this._renderer.appendChild(outer, inner);\n\n    const widthWithScroll = inner.offsetWidth;\n\n    // remove divs\n    this._renderer.removeChild(this._document.body, outer);\n\n    /**\n     * Scrollbar width will be 0 on Mac OS with the\n     * default \"Only show scrollbars when scrolling\" setting (Yosemite and up).\n     * setting default width to 20;\n     */\n    return widthNoScroll - widthWithScroll || 20;\n  }\n\n  private refreshWrapperDimensions() {\n    if (this.wrapper) {\n      this._renderer.setStyle(this.wrapper, 'width', '100%');\n      if (this._elementRef.nativeElement.style.height > 0 || this._elementRef.nativeElement.offsetHeight > 0) {\n        this._renderer.setStyle(this.wrapper, 'height', this._elementRef.nativeElement.style.height\n          || this._elementRef.nativeElement.offsetHeight + 'px');\n      } else {\n        this._renderer.setStyle(this.wrapper, 'height', '100%');\n      }\n    }\n  }\n\n  /*\n  * The below solution is heavily inspired from\n  * https://gist.github.com/andjosh/6764939\n  */\n  private scrollTo(element: Element, to: number, duration: number) {\n    const self = this;\n    self.isAnimating = true;\n    const rtlFactor = this.rtl ? -1 : 1;\n    const start = element.scrollLeft,\n      change = (rtlFactor * to) - start - this.snapOffset,\n      increment = 20;\n    let currentTime = 0;\n\n    // t = current time\n    // b = start value\n    // c = change in value\n    // d = duration\n    const easeInOutQuad = function (t: number, b: number, c: number, d: number) {\n      t /= d / 2;\n      if (t < 1) {\n        return c / 2 * t * t + b;\n      }\n      t--;\n      return -c / 2 * (t * (t - 2) - 1) + b;\n    };\n\n    const animateScroll = function () {\n      currentTime += increment;\n      element.scrollLeft = easeInOutQuad(currentTime, start, change, duration);\n      if (currentTime < duration) {\n        self.scrollToTimer = setTimeout(animateScroll, increment);\n      } else {\n        // run one more frame to make sure the animation is fully finished\n        setTimeout(() => {\n          self.isAnimating = false;\n          self.snapAnimationFinished.emit(self.currIndex);\n        }, increment);\n      }\n    };\n    animateScroll();\n  }\n\n  private locateCurrentIndex(snap?: boolean) {\n    const scrollLeft = Math.abs(this._contentRef.nativeElement.scrollLeft);\n\n    this.currentChildWidth((currentChildWidth, nextChildrenWidth, childrenWidth, idx: number, stop) => {\n      if (\n        (scrollLeft >= childrenWidth &&\n          scrollLeft <= nextChildrenWidth)\n      ) {\n        if (nextChildrenWidth - scrollLeft > currentChildWidth / 2 && !this.isScrollReachesRightEnd()) {\n          // roll back scrolling\n          if (!this.isAnimating) {\n            this.currIndex = idx;\n          }\n          if (snap) {\n            this.scrollTo(this._contentRef.nativeElement, childrenWidth, this.snapDuration);\n          }\n        } else if (scrollLeft !== 0) {\n          // forward scrolling\n          if (!this.isAnimating) {\n            this.currIndex = idx + 1;\n          }\n          if (snap) {\n            this.scrollTo(this._contentRef.nativeElement, childrenWidth + currentChildWidth, this.snapDuration);\n          }\n        }\n        stop();\n      } else if ((idx + 1) === (this._children.length - 1)) {\n        // reaches last index\n        if (!this.isAnimating) {\n          this.currIndex = idx + 1;\n        }\n        stop();\n      }\n    });\n  }\n\n  private currentChildWidth(cb: (\n    currentClildWidth: number,\n    nextChildrenWidth: number,\n    childrenWidth: number,\n    index: number,\n    breakFunc: () => void) => void) {\n    let childrenWidth = 0;\n    let shouldBreak = false;\n    const breakFunc = function () {\n      shouldBreak = true;\n    };\n    const childrenArr = this._children.toArray();\n\n    for (let i = 0; i < childrenArr.length; i++) {\n      if (i === childrenArr.length - 1) {\n        break;\n      }\n      if (shouldBreak) {\n        break;\n      }\n\n      const nextChildrenWidth = childrenWidth + childrenArr[i + 1]._elementRef.nativeElement.clientWidth;\n      const currentClildWidth = childrenArr[i]._elementRef.nativeElement.clientWidth;\n      cb(currentClildWidth, nextChildrenWidth, childrenWidth, i, breakFunc);\n\n      childrenWidth += currentClildWidth;\n    }\n  }\n\n  private toChildrenLocation(): number {\n    let to = 0;\n    const childrenArr = this._children.toArray();\n    for (let i = 0; i < this.currIndex; i++) {\n      to += childrenArr[i]._elementRef.nativeElement.clientWidth;\n    }\n    return to;\n  }\n\n  private locateDragScrollItem(element: Element): DragScrollItemDirective | null {\n    let item: DragScrollItemDirective | null = null;\n    const childrenArr = this._children.toArray();\n    for (let i = 0; i < childrenArr.length; i++) {\n      if (element === childrenArr[i]._elementRef.nativeElement) {\n        item = childrenArr[i];\n      }\n    }\n    return item;\n  }\n\n  private markElDimension() {\n    if (this.wrapper) {\n      this.elWidth = this.wrapper.style.width;\n      this.elHeight = this.wrapper.style.height;\n    } else {\n      this.elWidth = this._elementRef.nativeElement.style.width || (this._elementRef.nativeElement.offsetWidth + 'px');\n      this.elHeight = this._elementRef.nativeElement.style.height || (this._elementRef.nativeElement.offsetHeight + 'px');\n    }\n    const container = this.wrapper || this.parentNode;\n    const containerWidth = container ? container.clientWidth : 0;\n    if (this._children.length > 1) {\n      this.indexBound = this.maximumIndex(containerWidth, this._children.toArray());\n    }\n  }\n\n  private maximumIndex(containerWidth: number, childrenElements: DragScrollItemDirective[]): number {\n    let count = 0;\n    let childrenWidth = 0;\n    for (let i = 0; i <= childrenElements.length; i++) {\n      // last N element\n      const dragScrollItemDirective: DragScrollItemDirective = childrenElements[childrenElements.length - 1 - i];\n      if (!dragScrollItemDirective) {\n        break;\n      } else {\n        const nativeElement = dragScrollItemDirective._elementRef.nativeElement;\n        let itemWidth = nativeElement.clientWidth;\n        if (itemWidth === 0 && nativeElement.firstElementChild) {\n          itemWidth = dragScrollItemDirective._elementRef.nativeElement.firstElementChild.clientWidth;\n        }\n        childrenWidth += itemWidth;\n        if (childrenWidth < containerWidth) {\n          count++;\n        } else {\n          break;\n        }\n      }\n    }\n    return childrenElements.length - count;\n  }\n\n  private isScrollReachesRightEnd(): boolean {\n    const scrollLeftPos = Math.abs(this._contentRef.nativeElement.scrollLeft) + this._contentRef.nativeElement.offsetWidth;\n    return scrollLeftPos >= this._contentRef.nativeElement.scrollWidth;\n  }\n\n  /**\n   * adds a margin right style to the last child element which will resolve the issue\n   * of last item gets cutoff.\n   */\n  private adjustMarginToLastChild(): void {\n    if (this._children && this._children.length > 0 && this.hideScrollbar) {\n      const childrenArr = this._children.toArray();\n      const lastItem = childrenArr[childrenArr.length - 1]._elementRef.nativeElement;\n      if (this.wrapper && childrenArr.length > 1) {\n        this._renderer.setStyle(lastItem, 'margin-right', this.scrollbarWidth);\n      } else {\n        this._renderer.setStyle(lastItem, 'margin-right', 0);\n      }\n    }\n  }\n}\n","import { NgModule } from '@angular/core';\n\nimport { DragScrollComponent } from './ngx-drag-scroll.component';\nimport { DragScrollItemDirective } from './ngx-drag-scroll-item';\n\n@NgModule({\n  exports: [\n    DragScrollComponent,\n    DragScrollItemDirective\n  ],\n  declarations: [\n    DragScrollComponent,\n    DragScrollItemDirective\n  ]\n})\nexport class DragScrollModule { }\n","/*\n * Public API Surface of ngx-drag-scroll\n */\n\nexport * from './lib/ngx-drag-scroll.module';\nexport * from './lib/ngx-drag-scroll.component';\nexport * from './lib/ngx-drag-scroll-item';\nexport * from './lib/interface/drag-scroll-element';\nexport * from './lib/interface/drag-scroll-option';\n","/**\n * Generated bundle index. 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