angular-draggable-droppable/fesm2015/angular-draggable-droppable.mjs

import * as i0 from '@angular/core';
import { Injectable, Directive, EventEmitter, Optional, Inject, Input, Output, NgModule } from '@angular/core';
import { Subject, Observable, ReplaySubject, merge, combineLatest, fromEvent } from 'rxjs';
import { filter, mergeMap, startWith, map, share, takeUntil, take, takeLast, count, pairwise, distinctUntilChanged } from 'rxjs/operators';
import { DOCUMENT } from '@angular/common';
import autoScroll from '@mattlewis92/dom-autoscroller';

function addClass(renderer, element, classToAdd) {
    if (classToAdd) {
        classToAdd
            .split(' ')
            .forEach((className) => renderer.addClass(element.nativeElement, className));
    }
}
function removeClass(renderer, element, classToRemove) {
    if (classToRemove) {
        classToRemove
            .split(' ')
            .forEach((className) => renderer.removeClass(element.nativeElement, className));
    }
}

class DraggableHelper {
    constructor() {
        this.currentDrag = new Subject();
    }
}
DraggableHelper.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DraggableHelper, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
DraggableHelper.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DraggableHelper, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DraggableHelper, decorators: [{
            type: Injectable,
            args: [{
                    providedIn: 'root',
                }]
        }] });

/**
 * If the window isn't scrollable, then place this on the scrollable container that draggable elements are inside. e.g.
 * ```html
  <div style="overflow: scroll" mwlDraggableScrollContainer>
    <div mwlDraggable>Drag me!</div>
  </div>
  ```
 */
class DraggableScrollContainerDirective {
    /**
     * @hidden
     */
    constructor(elementRef) {
        this.elementRef = elementRef;
    }
}
DraggableScrollContainerDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DraggableScrollContainerDirective, deps: [{ token: i0.ElementRef }], target: i0.ɵɵFactoryTarget.Directive });
DraggableScrollContainerDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "15.0.3", type: DraggableScrollContainerDirective, selector: "[mwlDraggableScrollContainer]", ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DraggableScrollContainerDirective, decorators: [{
            type: Directive,
            args: [{
                    selector: '[mwlDraggableScrollContainer]',
                }]
        }], ctorParameters: function () { return [{ type: i0.ElementRef }]; } });

class DraggableDirective {
    /**
     * @hidden
     */
    constructor(element, renderer, draggableHelper, zone, vcr, scrollContainer, document) {
        this.element = element;
        this.renderer = renderer;
        this.draggableHelper = draggableHelper;
        this.zone = zone;
        this.vcr = vcr;
        this.scrollContainer = scrollContainer;
        this.document = document;
        /**
         * The axis along which the element is draggable
         */
        this.dragAxis = { x: true, y: true };
        /**
         * Snap all drags to an x / y grid
         */
        this.dragSnapGrid = {};
        /**
         * Show a ghost element that shows the drag when dragging
         */
        this.ghostDragEnabled = true;
        /**
         * Show the original element when ghostDragEnabled is true
         */
        this.showOriginalElementWhileDragging = false;
        /**
         * The cursor to use when hovering over a draggable element
         */
        this.dragCursor = '';
        /*
         * Options used to control the behaviour of auto scrolling: https://www.npmjs.com/package/dom-autoscroller
         */
        this.autoScroll = {
            margin: 20,
        };
        /**
         * Called when the element can be dragged along one axis and has the mouse or pointer device pressed on it
         */
        this.dragPointerDown = new EventEmitter();
        /**
         * Called when the element has started to be dragged.
         * Only called after at least one mouse or touch move event.
         * If you call $event.cancelDrag$.emit() it will cancel the current drag
         */
        this.dragStart = new EventEmitter();
        /**
         * Called after the ghost element has been created
         */
        this.ghostElementCreated = new EventEmitter();
        /**
         * Called when the element is being dragged
         */
        this.dragging = new EventEmitter();
        /**
         * Called after the element is dragged
         */
        this.dragEnd = new EventEmitter();
        /**
         * @hidden
         */
        this.pointerDown$ = new Subject();
        /**
         * @hidden
         */
        this.pointerMove$ = new Subject();
        /**
         * @hidden
         */
        this.pointerUp$ = new Subject();
        this.eventListenerSubscriptions = {};
        this.destroy$ = new Subject();
        this.timeLongPress = { timerBegin: 0, timerEnd: 0 };
    }
    ngOnInit() {
        this.checkEventListeners();
        const pointerDragged$ = this.pointerDown$.pipe(filter(() => this.canDrag()), mergeMap((pointerDownEvent) => {
            // fix for https://github.com/mattlewis92/angular-draggable-droppable/issues/61
            // stop mouse events propagating up the chain
            if (pointerDownEvent.event.stopPropagation && !this.scrollContainer) {
                pointerDownEvent.event.stopPropagation();
            }
            // hack to prevent text getting selected in safari while dragging
            const globalDragStyle = this.renderer.createElement('style');
            this.renderer.setAttribute(globalDragStyle, 'type', 'text/css');
            this.renderer.appendChild(globalDragStyle, this.renderer.createText(`
          body * {
           -moz-user-select: none;
           -ms-user-select: none;
           -webkit-user-select: none;
           user-select: none;
          }
        `));
            requestAnimationFrame(() => {
                this.document.head.appendChild(globalDragStyle);
            });
            const startScrollPosition = this.getScrollPosition();
            const scrollContainerScroll$ = new Observable((observer) => {
                const scrollContainer = this.scrollContainer
                    ? this.scrollContainer.elementRef.nativeElement
                    : 'window';
                return this.renderer.listen(scrollContainer, 'scroll', (e) => observer.next(e));
            }).pipe(startWith(startScrollPosition), map(() => this.getScrollPosition()));
            const currentDrag$ = new Subject();
            const cancelDrag$ = new ReplaySubject();
            if (this.dragPointerDown.observers.length > 0) {
                this.zone.run(() => {
                    this.dragPointerDown.next({ x: 0, y: 0 });
                });
            }
            const dragComplete$ = merge(this.pointerUp$, this.pointerDown$, cancelDrag$, this.destroy$).pipe(share());
            const pointerMove = combineLatest([
                this.pointerMove$,
                scrollContainerScroll$,
            ]).pipe(map(([pointerMoveEvent, scroll]) => {
                return {
                    currentDrag$,
                    transformX: pointerMoveEvent.clientX - pointerDownEvent.clientX,
                    transformY: pointerMoveEvent.clientY - pointerDownEvent.clientY,
                    clientX: pointerMoveEvent.clientX,
                    clientY: pointerMoveEvent.clientY,
                    scrollLeft: scroll.left,
                    scrollTop: scroll.top,
                    target: pointerMoveEvent.event.target,
                };
            }), map((moveData) => {
                if (this.dragSnapGrid.x) {
                    moveData.transformX =
                        Math.round(moveData.transformX / this.dragSnapGrid.x) *
                            this.dragSnapGrid.x;
                }
                if (this.dragSnapGrid.y) {
                    moveData.transformY =
                        Math.round(moveData.transformY / this.dragSnapGrid.y) *
                            this.dragSnapGrid.y;
                }
                return moveData;
            }), map((moveData) => {
                if (!this.dragAxis.x) {
                    moveData.transformX = 0;
                }
                if (!this.dragAxis.y) {
                    moveData.transformY = 0;
                }
                return moveData;
            }), map((moveData) => {
                const scrollX = moveData.scrollLeft - startScrollPosition.left;
                const scrollY = moveData.scrollTop - startScrollPosition.top;
                return Object.assign(Object.assign({}, moveData), { x: moveData.transformX + scrollX, y: moveData.transformY + scrollY });
            }), filter(({ x, y, transformX, transformY }) => !this.validateDrag ||
                this.validateDrag({
                    x,
                    y,
                    transform: { x: transformX, y: transformY },
                })), takeUntil(dragComplete$), share());
            const dragStarted$ = pointerMove.pipe(take(1), share());
            const dragEnded$ = pointerMove.pipe(takeLast(1), share());
            dragStarted$.subscribe(({ clientX, clientY, x, y }) => {
                if (this.dragStart.observers.length > 0) {
                    this.zone.run(() => {
                        this.dragStart.next({ cancelDrag$ });
                    });
                }
                this.scroller = autoScroll([
                    this.scrollContainer
                        ? this.scrollContainer.elementRef.nativeElement
                        : this.document.defaultView,
                ], Object.assign(Object.assign({}, this.autoScroll), { autoScroll() {
                        return true;
                    } }));
                addClass(this.renderer, this.element, this.dragActiveClass);
                if (this.ghostDragEnabled) {
                    const rect = this.element.nativeElement.getBoundingClientRect();
                    const clone = this.element.nativeElement.cloneNode(true);
                    if (!this.showOriginalElementWhileDragging) {
                        this.renderer.setStyle(this.element.nativeElement, 'visibility', 'hidden');
                    }
                    if (this.ghostElementAppendTo) {
                        this.ghostElementAppendTo.appendChild(clone);
                    }
                    else {
                        this.element.nativeElement.parentNode.insertBefore(clone, this.element.nativeElement.nextSibling);
                    }
                    this.ghostElement = clone;
                    this.document.body.style.cursor = this.dragCursor;
                    this.setElementStyles(clone, {
                        position: 'fixed',
                        top: `${rect.top}px`,
                        left: `${rect.left}px`,
                        width: `${rect.width}px`,
                        height: `${rect.height}px`,
                        cursor: this.dragCursor,
                        margin: '0',
                        willChange: 'transform',
                        pointerEvents: 'none',
                    });
                    if (this.ghostElementTemplate) {
                        const viewRef = this.vcr.createEmbeddedView(this.ghostElementTemplate);
                        clone.innerHTML = '';
                        viewRef.rootNodes
                            .filter((node) => node instanceof Node)
                            .forEach((node) => {
                            clone.appendChild(node);
                        });
                        dragEnded$.subscribe(() => {
                            this.vcr.remove(this.vcr.indexOf(viewRef));
                        });
                    }
                    if (this.ghostElementCreated.observers.length > 0) {
                        this.zone.run(() => {
                            this.ghostElementCreated.emit({
                                clientX: clientX - x,
                                clientY: clientY - y,
                                element: clone,
                            });
                        });
                    }
                    dragEnded$.subscribe(() => {
                        clone.parentElement.removeChild(clone);
                        this.ghostElement = null;
                        this.renderer.setStyle(this.element.nativeElement, 'visibility', '');
                    });
                }
                this.draggableHelper.currentDrag.next(currentDrag$);
            });
            dragEnded$
                .pipe(mergeMap((dragEndData) => {
                const dragEndData$ = cancelDrag$.pipe(count(), take(1), map((calledCount) => (Object.assign(Object.assign({}, dragEndData), { dragCancelled: calledCount > 0 }))));
                cancelDrag$.complete();
                return dragEndData$;
            }))
                .subscribe(({ x, y, dragCancelled }) => {
                this.scroller.destroy();
                if (this.dragEnd.observers.length > 0) {
                    this.zone.run(() => {
                        this.dragEnd.next({ x, y, dragCancelled });
                    });
                }
                removeClass(this.renderer, this.element, this.dragActiveClass);
                currentDrag$.complete();
            });
            merge(dragComplete$, dragEnded$)
                .pipe(take(1))
                .subscribe(() => {
                requestAnimationFrame(() => {
                    this.document.head.removeChild(globalDragStyle);
                });
            });
            return pointerMove;
        }), share());
        merge(pointerDragged$.pipe(take(1), map((value) => [, value])), pointerDragged$.pipe(pairwise()))
            .pipe(filter(([previous, next]) => {
            if (!previous) {
                return true;
            }
            return previous.x !== next.x || previous.y !== next.y;
        }), map(([previous, next]) => next))
            .subscribe(({ x, y, currentDrag$, clientX, clientY, transformX, transformY, target, }) => {
            if (this.dragging.observers.length > 0) {
                this.zone.run(() => {
                    this.dragging.next({ x, y });
                });
            }
            requestAnimationFrame(() => {
                if (this.ghostElement) {
                    const transform = `translate3d(${transformX}px, ${transformY}px, 0px)`;
                    this.setElementStyles(this.ghostElement, {
                        transform,
                        '-webkit-transform': transform,
                        '-ms-transform': transform,
                        '-moz-transform': transform,
                        '-o-transform': transform,
                    });
                }
            });
            currentDrag$.next({
                clientX,
                clientY,
                dropData: this.dropData,
                target,
            });
        });
    }
    ngOnChanges(changes) {
        if (changes.dragAxis) {
            this.checkEventListeners();
        }
    }
    ngOnDestroy() {
        this.unsubscribeEventListeners();
        this.pointerDown$.complete();
        this.pointerMove$.complete();
        this.pointerUp$.complete();
        this.destroy$.next();
    }
    checkEventListeners() {
        const canDrag = this.canDrag();
        const hasEventListeners = Object.keys(this.eventListenerSubscriptions).length > 0;
        if (canDrag && !hasEventListeners) {
            this.zone.runOutsideAngular(() => {
                this.eventListenerSubscriptions.mousedown = this.renderer.listen(this.element.nativeElement, 'mousedown', (event) => {
                    this.onMouseDown(event);
                });
                this.eventListenerSubscriptions.mouseup = this.renderer.listen('document', 'mouseup', (event) => {
                    this.onMouseUp(event);
                });
                this.eventListenerSubscriptions.touchstart = this.renderer.listen(this.element.nativeElement, 'touchstart', (event) => {
                    this.onTouchStart(event);
                });
                this.eventListenerSubscriptions.touchend = this.renderer.listen('document', 'touchend', (event) => {
                    this.onTouchEnd(event);
                });
                this.eventListenerSubscriptions.touchcancel = this.renderer.listen('document', 'touchcancel', (event) => {
                    this.onTouchEnd(event);
                });
                this.eventListenerSubscriptions.mouseenter = this.renderer.listen(this.element.nativeElement, 'mouseenter', () => {
                    this.onMouseEnter();
                });
                this.eventListenerSubscriptions.mouseleave = this.renderer.listen(this.element.nativeElement, 'mouseleave', () => {
                    this.onMouseLeave();
                });
            });
        }
        else if (!canDrag && hasEventListeners) {
            this.unsubscribeEventListeners();
        }
    }
    onMouseDown(event) {
        if (event.button === 0) {
            if (!this.eventListenerSubscriptions.mousemove) {
                this.eventListenerSubscriptions.mousemove = this.renderer.listen('document', 'mousemove', (mouseMoveEvent) => {
                    this.pointerMove$.next({
                        event: mouseMoveEvent,
                        clientX: mouseMoveEvent.clientX,
                        clientY: mouseMoveEvent.clientY,
                    });
                });
            }
            this.pointerDown$.next({
                event,
                clientX: event.clientX,
                clientY: event.clientY,
            });
        }
    }
    onMouseUp(event) {
        if (event.button === 0) {
            if (this.eventListenerSubscriptions.mousemove) {
                this.eventListenerSubscriptions.mousemove();
                delete this.eventListenerSubscriptions.mousemove;
            }
            this.pointerUp$.next({
                event,
                clientX: event.clientX,
                clientY: event.clientY,
            });
        }
    }
    onTouchStart(event) {
        let startScrollPosition;
        let isDragActivated;
        let hasContainerScrollbar;
        if (this.touchStartLongPress) {
            this.timeLongPress.timerBegin = Date.now();
            isDragActivated = false;
            hasContainerScrollbar = this.hasScrollbar();
            startScrollPosition = this.getScrollPosition();
        }
        if (!this.eventListenerSubscriptions.touchmove) {
            const contextMenuListener = fromEvent(this.document, 'contextmenu').subscribe((e) => {
                e.preventDefault();
            });
            const touchMoveListener = fromEvent(this.document, 'touchmove', {
                passive: false,
            }).subscribe((touchMoveEvent) => {
                if (this.touchStartLongPress &&
                    !isDragActivated &&
                    hasContainerScrollbar) {
                    isDragActivated = this.shouldBeginDrag(event, touchMoveEvent, startScrollPosition);
                }
                if (!this.touchStartLongPress ||
                    !hasContainerScrollbar ||
                    isDragActivated) {
                    touchMoveEvent.preventDefault();
                    this.pointerMove$.next({
                        event: touchMoveEvent,
                        clientX: touchMoveEvent.targetTouches[0].clientX,
                        clientY: touchMoveEvent.targetTouches[0].clientY,
                    });
                }
            });
            this.eventListenerSubscriptions.touchmove = () => {
                contextMenuListener.unsubscribe();
                touchMoveListener.unsubscribe();
            };
        }
        this.pointerDown$.next({
            event,
            clientX: event.touches[0].clientX,
            clientY: event.touches[0].clientY,
        });
    }
    onTouchEnd(event) {
        if (this.eventListenerSubscriptions.touchmove) {
            this.eventListenerSubscriptions.touchmove();
            delete this.eventListenerSubscriptions.touchmove;
            if (this.touchStartLongPress) {
                this.enableScroll();
            }
        }
        this.pointerUp$.next({
            event,
            clientX: event.changedTouches[0].clientX,
            clientY: event.changedTouches[0].clientY,
        });
    }
    onMouseEnter() {
        this.setCursor(this.dragCursor);
    }
    onMouseLeave() {
        this.setCursor('');
    }
    canDrag() {
        return this.dragAxis.x || this.dragAxis.y;
    }
    setCursor(value) {
        if (!this.eventListenerSubscriptions.mousemove) {
            this.renderer.setStyle(this.element.nativeElement, 'cursor', value);
        }
    }
    unsubscribeEventListeners() {
        Object.keys(this.eventListenerSubscriptions).forEach((type) => {
            this.eventListenerSubscriptions[type]();
            delete this.eventListenerSubscriptions[type];
        });
    }
    setElementStyles(element, styles) {
        Object.keys(styles).forEach((key) => {
            this.renderer.setStyle(element, key, styles[key]);
        });
    }
    getScrollElement() {
        if (this.scrollContainer) {
            return this.scrollContainer.elementRef.nativeElement;
        }
        else {
            return this.document.body;
        }
    }
    getScrollPosition() {
        if (this.scrollContainer) {
            return {
                top: this.scrollContainer.elementRef.nativeElement.scrollTop,
                left: this.scrollContainer.elementRef.nativeElement.scrollLeft,
            };
        }
        else {
            return {
                top: window.pageYOffset || this.document.documentElement.scrollTop,
                left: window.pageXOffset || this.document.documentElement.scrollLeft,
            };
        }
    }
    shouldBeginDrag(event, touchMoveEvent, startScrollPosition) {
        const moveScrollPosition = this.getScrollPosition();
        const deltaScroll = {
            top: Math.abs(moveScrollPosition.top - startScrollPosition.top),
            left: Math.abs(moveScrollPosition.left - startScrollPosition.left),
        };
        const deltaX = Math.abs(touchMoveEvent.targetTouches[0].clientX - event.touches[0].clientX) - deltaScroll.left;
        const deltaY = Math.abs(touchMoveEvent.targetTouches[0].clientY - event.touches[0].clientY) - deltaScroll.top;
        const deltaTotal = deltaX + deltaY;
        const longPressConfig = this.touchStartLongPress;
        if (deltaTotal > longPressConfig.delta ||
            deltaScroll.top > 0 ||
            deltaScroll.left > 0) {
            this.timeLongPress.timerBegin = Date.now();
        }
        this.timeLongPress.timerEnd = Date.now();
        const duration = this.timeLongPress.timerEnd - this.timeLongPress.timerBegin;
        if (duration >= longPressConfig.delay) {
            this.disableScroll();
            return true;
        }
        return false;
    }
    enableScroll() {
        if (this.scrollContainer) {
            this.renderer.setStyle(this.scrollContainer.elementRef.nativeElement, 'overflow', '');
        }
        this.renderer.setStyle(this.document.body, 'overflow', '');
    }
    disableScroll() {
        /* istanbul ignore next */
        if (this.scrollContainer) {
            this.renderer.setStyle(this.scrollContainer.elementRef.nativeElement, 'overflow', 'hidden');
        }
        this.renderer.setStyle(this.document.body, 'overflow', 'hidden');
    }
    hasScrollbar() {
        const scrollContainer = this.getScrollElement();
        const containerHasHorizontalScroll = scrollContainer.scrollWidth > scrollContainer.clientWidth;
        const containerHasVerticalScroll = scrollContainer.scrollHeight > scrollContainer.clientHeight;
        return containerHasHorizontalScroll || containerHasVerticalScroll;
    }
}
DraggableDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DraggableDirective, deps: [{ token: i0.ElementRef }, { token: i0.Renderer2 }, { token: DraggableHelper }, { token: i0.NgZone }, { token: i0.ViewContainerRef }, { token: DraggableScrollContainerDirective, optional: true }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Directive });
DraggableDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "15.0.3", type: DraggableDirective, selector: "[mwlDraggable]", inputs: { dropData: "dropData", dragAxis: "dragAxis", dragSnapGrid: "dragSnapGrid", ghostDragEnabled: "ghostDragEnabled", showOriginalElementWhileDragging: "showOriginalElementWhileDragging", validateDrag: "validateDrag", dragCursor: "dragCursor", dragActiveClass: "dragActiveClass", ghostElementAppendTo: "ghostElementAppendTo", ghostElementTemplate: "ghostElementTemplate", touchStartLongPress: "touchStartLongPress", autoScroll: "autoScroll" }, outputs: { dragPointerDown: "dragPointerDown", dragStart: "dragStart", ghostElementCreated: "ghostElementCreated", dragging: "dragging", dragEnd: "dragEnd" }, usesOnChanges: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DraggableDirective, decorators: [{
            type: Directive,
            args: [{
                    selector: '[mwlDraggable]',
                }]
        }], ctorParameters: function () {
        return [{ type: i0.ElementRef }, { type: i0.Renderer2 }, { type: DraggableHelper }, { type: i0.NgZone }, { type: i0.ViewContainerRef }, { type: DraggableScrollContainerDirective, decorators: [{
                        type: Optional
                    }] }, { type: undefined, decorators: [{
                        type: Inject,
                        args: [DOCUMENT]
                    }] }];
    }, propDecorators: { dropData: [{
                type: Input
            }], dragAxis: [{
                type: Input
            }], dragSnapGrid: [{
                type: Input
            }], ghostDragEnabled: [{
                type: Input
            }], showOriginalElementWhileDragging: [{
                type: Input
            }], validateDrag: [{
                type: Input
            }], dragCursor: [{
                type: Input
            }], dragActiveClass: [{
                type: Input
            }], ghostElementAppendTo: [{
                type: Input
            }], ghostElementTemplate: [{
                type: Input
            }], touchStartLongPress: [{
                type: Input
            }], autoScroll: [{
                type: Input
            }], dragPointerDown: [{
                type: Output
            }], dragStart: [{
                type: Output
            }], ghostElementCreated: [{
                type: Output
            }], dragging: [{
                type: Output
            }], dragEnd: [{
                type: Output
            }] } });

function isCoordinateWithinRectangle(clientX, clientY, rect) {
    return (clientX >= rect.left &&
        clientX <= rect.right &&
        clientY >= rect.top &&
        clientY <= rect.bottom);
}
class DroppableDirective {
    constructor(element, draggableHelper, zone, renderer, scrollContainer) {
        this.element = element;
        this.draggableHelper = draggableHelper;
        this.zone = zone;
        this.renderer = renderer;
        this.scrollContainer = scrollContainer;
        /**
         * Called when a draggable element starts overlapping the element
         */
        this.dragEnter = new EventEmitter();
        /**
         * Called when a draggable element stops overlapping the element
         */
        this.dragLeave = new EventEmitter();
        /**
         * Called when a draggable element is moved over the element
         */
        this.dragOver = new EventEmitter();
        /**
         * Called when a draggable element is dropped on this element
         */
        this.drop = new EventEmitter(); // eslint-disable-line  @angular-eslint/no-output-native
    }
    ngOnInit() {
        this.currentDragSubscription = this.draggableHelper.currentDrag.subscribe((drag$) => {
            addClass(this.renderer, this.element, this.dragActiveClass);
            const droppableElement = {
                updateCache: true,
            };
            const deregisterScrollListener = this.renderer.listen(this.scrollContainer
                ? this.scrollContainer.elementRef.nativeElement
                : 'window', 'scroll', () => {
                droppableElement.updateCache = true;
            });
            let currentDragEvent;
            const overlaps$ = drag$.pipe(map(({ clientX, clientY, dropData, target }) => {
                currentDragEvent = { clientX, clientY, dropData, target };
                if (droppableElement.updateCache) {
                    droppableElement.rect =
                        this.element.nativeElement.getBoundingClientRect();
                    if (this.scrollContainer) {
                        droppableElement.scrollContainerRect =
                            this.scrollContainer.elementRef.nativeElement.getBoundingClientRect();
                    }
                    droppableElement.updateCache = false;
                }
                const isWithinElement = isCoordinateWithinRectangle(clientX, clientY, droppableElement.rect);
                const isDropAllowed = !this.validateDrop ||
                    this.validateDrop({ clientX, clientY, target, dropData });
                if (droppableElement.scrollContainerRect) {
                    return (isWithinElement &&
                        isDropAllowed &&
                        isCoordinateWithinRectangle(clientX, clientY, droppableElement.scrollContainerRect));
                }
                else {
                    return isWithinElement && isDropAllowed;
                }
            }));
            const overlapsChanged$ = overlaps$.pipe(distinctUntilChanged());
            let dragOverActive; // TODO - see if there's a way of doing this via rxjs
            overlapsChanged$
                .pipe(filter((overlapsNow) => overlapsNow))
                .subscribe(() => {
                dragOverActive = true;
                addClass(this.renderer, this.element, this.dragOverClass);
                if (this.dragEnter.observers.length > 0) {
                    this.zone.run(() => {
                        this.dragEnter.next(currentDragEvent);
                    });
                }
            });
            overlaps$.pipe(filter((overlapsNow) => overlapsNow)).subscribe(() => {
                if (this.dragOver.observers.length > 0) {
                    this.zone.run(() => {
                        this.dragOver.next(currentDragEvent);
                    });
                }
            });
            overlapsChanged$
                .pipe(pairwise(), filter(([didOverlap, overlapsNow]) => didOverlap && !overlapsNow))
                .subscribe(() => {
                dragOverActive = false;
                removeClass(this.renderer, this.element, this.dragOverClass);
                if (this.dragLeave.observers.length > 0) {
                    this.zone.run(() => {
                        this.dragLeave.next(currentDragEvent);
                    });
                }
            });
            drag$.subscribe({
                complete: () => {
                    deregisterScrollListener();
                    removeClass(this.renderer, this.element, this.dragActiveClass);
                    if (dragOverActive) {
                        removeClass(this.renderer, this.element, this.dragOverClass);
                        if (this.drop.observers.length > 0) {
                            this.zone.run(() => {
                                this.drop.next(currentDragEvent);
                            });
                        }
                    }
                },
            });
        });
    }
    ngOnDestroy() {
        if (this.currentDragSubscription) {
            this.currentDragSubscription.unsubscribe();
        }
    }
}
DroppableDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DroppableDirective, deps: [{ token: i0.ElementRef }, { token: DraggableHelper }, { token: i0.NgZone }, { token: i0.Renderer2 }, { token: DraggableScrollContainerDirective, optional: true }], target: i0.ɵɵFactoryTarget.Directive });
DroppableDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "15.0.3", type: DroppableDirective, selector: "[mwlDroppable]", inputs: { dragOverClass: "dragOverClass", dragActiveClass: "dragActiveClass", validateDrop: "validateDrop" }, outputs: { dragEnter: "dragEnter", dragLeave: "dragLeave", dragOver: "dragOver", drop: "drop" }, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DroppableDirective, decorators: [{
            type: Directive,
            args: [{
                    selector: '[mwlDroppable]',
                }]
        }], ctorParameters: function () {
        return [{ type: i0.ElementRef }, { type: DraggableHelper }, { type: i0.NgZone }, { type: i0.Renderer2 }, { type: DraggableScrollContainerDirective, decorators: [{
                        type: Optional
                    }] }];
    }, propDecorators: { dragOverClass: [{
                type: Input
            }], dragActiveClass: [{
                type: Input
            }], validateDrop: [{
                type: Input
            }], dragEnter: [{
                type: Output
            }], dragLeave: [{
                type: Output
            }], dragOver: [{
                type: Output
            }], drop: [{
                type: Output
            }] } });

class DragAndDropModule {
}
DragAndDropModule.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DragAndDropModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
DragAndDropModule.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "14.0.0", version: "15.0.3", ngImport: i0, type: DragAndDropModule, declarations: [DraggableDirective,
        DroppableDirective,
        DraggableScrollContainerDirective], exports: [DraggableDirective,
        DroppableDirective,
        DraggableScrollContainerDirective] });
DragAndDropModule.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DragAndDropModule });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.3", ngImport: i0, type: DragAndDropModule, decorators: [{
            type: NgModule,
            args: [{
                    declarations: [
                        DraggableDirective,
                        DroppableDirective,
                        DraggableScrollContainerDirective,
                    ],
                    exports: [
                        DraggableDirective,
                        DroppableDirective,
                        DraggableScrollContainerDirective,
                    ],
                }]
        }] });

/*
 * Public API Surface of angular-draggable-droppable
 */

/**
 * Generated bundle index. Do not edit.
 */

export { DragAndDropModule, DraggableDirective, DraggableScrollContainerDirective, DroppableDirective };
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