jnpf-web-vue3/node_modules/@fullcalendar/interaction/index.js

import { createPlugin } from '@fullcalendar/core/index.js';
import { config, Emitter, elementClosest, applyStyle, whenTransitionDone, removeElement, ScrollController, ElementScrollController, computeInnerRect, WindowScrollController, ElementDragging, preventSelection, preventContextMenu, allowSelection, allowContextMenu, computeRect, getClippingParents, pointInsideRect, constrainPoint, intersectRects, getRectCenter, diffPoints, mapHash, rangeContainsRange, isDateSpansEqual, Interaction, interactionSettingsToStore, isDateSelectionValid, enableCursor, disableCursor, triggerDateSelect, compareNumbers, getElSeg, getRelevantEvents, EventImpl, createEmptyEventStore, applyMutationToEventStore, isInteractionValid, buildEventApis, interactionSettingsStore, startOfDay, diffDates, createDuration, getEventTargetViaRoot, identity, eventTupleToStore, parseDragMeta, elementMatches, refineEventDef, parseEventDef, getDefaultEventEnd, createEventInstance, BASE_OPTION_DEFAULTS } from '@fullcalendar/core/internal.js';

config.touchMouseIgnoreWait = 500;
let ignoreMouseDepth = 0;
let listenerCnt = 0;
let isWindowTouchMoveCancelled = false;
/*
Uses a "pointer" abstraction, which monitors UI events for both mouse and touch.
Tracks when the pointer "drags" on a certain element, meaning down+move+up.

Also, tracks if there was touch-scrolling.
Also, can prevent touch-scrolling from happening.
Also, can fire pointermove events when scrolling happens underneath, even when no real pointer movement.

emits:
- pointerdown
- pointermove
- pointerup
*/
class PointerDragging {
    constructor(containerEl) {
        this.subjectEl = null;
        // options that can be directly assigned by caller
        this.selector = ''; // will cause subjectEl in all emitted events to be this element
        this.handleSelector = '';
        this.shouldIgnoreMove = false;
        this.shouldWatchScroll = true; // for simulating pointermove on scroll
        // internal states
        this.isDragging = false;
        this.isTouchDragging = false;
        this.wasTouchScroll = false;
        // Mouse
        // ----------------------------------------------------------------------------------------------------
        this.handleMouseDown = (ev) => {
            if (!this.shouldIgnoreMouse() &&
                isPrimaryMouseButton(ev) &&
                this.tryStart(ev)) {
                let pev = this.createEventFromMouse(ev, true);
                this.emitter.trigger('pointerdown', pev);
                this.initScrollWatch(pev);
                if (!this.shouldIgnoreMove) {
                    document.addEventListener('mousemove', this.handleMouseMove);
                }
                document.addEventListener('mouseup', this.handleMouseUp);
            }
        };
        this.handleMouseMove = (ev) => {
            let pev = this.createEventFromMouse(ev);
            this.recordCoords(pev);
            this.emitter.trigger('pointermove', pev);
        };
        this.handleMouseUp = (ev) => {
            document.removeEventListener('mousemove', this.handleMouseMove);
            document.removeEventListener('mouseup', this.handleMouseUp);
            this.emitter.trigger('pointerup', this.createEventFromMouse(ev));
            this.cleanup(); // call last so that pointerup has access to props
        };
        // Touch
        // ----------------------------------------------------------------------------------------------------
        this.handleTouchStart = (ev) => {
            if (this.tryStart(ev)) {
                this.isTouchDragging = true;
                let pev = this.createEventFromTouch(ev, true);
                this.emitter.trigger('pointerdown', pev);
                this.initScrollWatch(pev);
                // unlike mouse, need to attach to target, not document
                // https://stackoverflow.com/a/45760014
                let targetEl = ev.target;
                if (!this.shouldIgnoreMove) {
                    targetEl.addEventListener('touchmove', this.handleTouchMove);
                }
                targetEl.addEventListener('touchend', this.handleTouchEnd);
                targetEl.addEventListener('touchcancel', this.handleTouchEnd); // treat it as a touch end
                // attach a handler to get called when ANY scroll action happens on the page.
                // this was impossible to do with normal on/off because 'scroll' doesn't bubble.
                // http://stackoverflow.com/a/32954565/96342
                window.addEventListener('scroll', this.handleTouchScroll, true);
            }
        };
        this.handleTouchMove = (ev) => {
            let pev = this.createEventFromTouch(ev);
            this.recordCoords(pev);
            this.emitter.trigger('pointermove', pev);
        };
        this.handleTouchEnd = (ev) => {
            if (this.isDragging) { // done to guard against touchend followed by touchcancel
                let targetEl = ev.target;
                targetEl.removeEventListener('touchmove', this.handleTouchMove);
                targetEl.removeEventListener('touchend', this.handleTouchEnd);
                targetEl.removeEventListener('touchcancel', this.handleTouchEnd);
                window.removeEventListener('scroll', this.handleTouchScroll, true); // useCaptured=true
                this.emitter.trigger('pointerup', this.createEventFromTouch(ev));
                this.cleanup(); // call last so that pointerup has access to props
                this.isTouchDragging = false;
                startIgnoringMouse();
            }
        };
        this.handleTouchScroll = () => {
            this.wasTouchScroll = true;
        };
        this.handleScroll = (ev) => {
            if (!this.shouldIgnoreMove) {
                let pageX = (window.scrollX - this.prevScrollX) + this.prevPageX;
                let pageY = (window.scrollY - this.prevScrollY) + this.prevPageY;
                this.emitter.trigger('pointermove', {
                    origEvent: ev,
                    isTouch: this.isTouchDragging,
                    subjectEl: this.subjectEl,
                    pageX,
                    pageY,
                    deltaX: pageX - this.origPageX,
                    deltaY: pageY - this.origPageY,
                });
            }
        };
        this.containerEl = containerEl;
        this.emitter = new Emitter();
        containerEl.addEventListener('mousedown', this.handleMouseDown);
        containerEl.addEventListener('touchstart', this.handleTouchStart, { passive: true });
        listenerCreated();
    }
    destroy() {
        this.containerEl.removeEventListener('mousedown', this.handleMouseDown);
        this.containerEl.removeEventListener('touchstart', this.handleTouchStart, { passive: true });
        listenerDestroyed();
    }
    tryStart(ev) {
        let subjectEl = this.querySubjectEl(ev);
        let downEl = ev.target;
        if (subjectEl &&
            (!this.handleSelector || elementClosest(downEl, this.handleSelector))) {
            this.subjectEl = subjectEl;
            this.isDragging = true; // do this first so cancelTouchScroll will work
            this.wasTouchScroll = false;
            return true;
        }
        return false;
    }
    cleanup() {
        isWindowTouchMoveCancelled = false;
        this.isDragging = false;
        this.subjectEl = null;
        // keep wasTouchScroll around for later access
        this.destroyScrollWatch();
    }
    querySubjectEl(ev) {
        if (this.selector) {
            return elementClosest(ev.target, this.selector);
        }
        return this.containerEl;
    }
    shouldIgnoreMouse() {
        return ignoreMouseDepth || this.isTouchDragging;
    }
    // can be called by user of this class, to cancel touch-based scrolling for the current drag
    cancelTouchScroll() {
        if (this.isDragging) {
            isWindowTouchMoveCancelled = true;
        }
    }
    // Scrolling that simulates pointermoves
    // ----------------------------------------------------------------------------------------------------
    initScrollWatch(ev) {
        if (this.shouldWatchScroll) {
            this.recordCoords(ev);
            window.addEventListener('scroll', this.handleScroll, true); // useCapture=true
        }
    }
    recordCoords(ev) {
        if (this.shouldWatchScroll) {
            this.prevPageX = ev.pageX;
            this.prevPageY = ev.pageY;
            this.prevScrollX = window.scrollX;
            this.prevScrollY = window.scrollY;
        }
    }
    destroyScrollWatch() {
        if (this.shouldWatchScroll) {
            window.removeEventListener('scroll', this.handleScroll, true); // useCaptured=true
        }
    }
    // Event Normalization
    // ----------------------------------------------------------------------------------------------------
    createEventFromMouse(ev, isFirst) {
        let deltaX = 0;
        let deltaY = 0;
        // TODO: repeat code
        if (isFirst) {
            this.origPageX = ev.pageX;
            this.origPageY = ev.pageY;
        }
        else {
            deltaX = ev.pageX - this.origPageX;
            deltaY = ev.pageY - this.origPageY;
        }
        return {
            origEvent: ev,
            isTouch: false,
            subjectEl: this.subjectEl,
            pageX: ev.pageX,
            pageY: ev.pageY,
            deltaX,
            deltaY,
        };
    }
    createEventFromTouch(ev, isFirst) {
        let touches = ev.touches;
        let pageX;
        let pageY;
        let deltaX = 0;
        let deltaY = 0;
        // if touch coords available, prefer,
        // because FF would give bad ev.pageX ev.pageY
        if (touches && touches.length) {
            pageX = touches[0].pageX;
            pageY = touches[0].pageY;
        }
        else {
            pageX = ev.pageX;
            pageY = ev.pageY;
        }
        // TODO: repeat code
        if (isFirst) {
            this.origPageX = pageX;
            this.origPageY = pageY;
        }
        else {
            deltaX = pageX - this.origPageX;
            deltaY = pageY - this.origPageY;
        }
        return {
            origEvent: ev,
            isTouch: true,
            subjectEl: this.subjectEl,
            pageX,
            pageY,
            deltaX,
            deltaY,
        };
    }
}
// Returns a boolean whether this was a left mouse click and no ctrl key (which means right click on Mac)
function isPrimaryMouseButton(ev) {
    return ev.button === 0 && !ev.ctrlKey;
}
// Ignoring fake mouse events generated by touch
// ----------------------------------------------------------------------------------------------------
function startIgnoringMouse() {
    ignoreMouseDepth += 1;
    setTimeout(() => {
        ignoreMouseDepth -= 1;
    }, config.touchMouseIgnoreWait);
}
// We want to attach touchmove as early as possible for Safari
// ----------------------------------------------------------------------------------------------------
function listenerCreated() {
    listenerCnt += 1;
    if (listenerCnt === 1) {
        window.addEventListener('touchmove', onWindowTouchMove, { passive: false });
    }
}
function listenerDestroyed() {
    listenerCnt -= 1;
    if (!listenerCnt) {
        window.removeEventListener('touchmove', onWindowTouchMove, { passive: false });
    }
}
function onWindowTouchMove(ev) {
    if (isWindowTouchMoveCancelled) {
        ev.preventDefault();
    }
}

/*
An effect in which an element follows the movement of a pointer across the screen.
The moving element is a clone of some other element.
Must call start + handleMove + stop.
*/
class ElementMirror {
    constructor() {
        this.isVisible = false; // must be explicitly enabled
        this.sourceEl = null;
        this.mirrorEl = null;
        this.sourceElRect = null; // screen coords relative to viewport
        // options that can be set directly by caller
        this.parentNode = document.body; // HIGHLY SUGGESTED to set this to sidestep ShadowDOM issues
        this.zIndex = 9999;
        this.revertDuration = 0;
    }
    start(sourceEl, pageX, pageY) {
        this.sourceEl = sourceEl;
        this.sourceElRect = this.sourceEl.getBoundingClientRect();
        this.origScreenX = pageX - window.scrollX;
        this.origScreenY = pageY - window.scrollY;
        this.deltaX = 0;
        this.deltaY = 0;
        this.updateElPosition();
    }
    handleMove(pageX, pageY) {
        this.deltaX = (pageX - window.scrollX) - this.origScreenX;
        this.deltaY = (pageY - window.scrollY) - this.origScreenY;
        this.updateElPosition();
    }
    // can be called before start
    setIsVisible(bool) {
        if (bool) {
            if (!this.isVisible) {
                if (this.mirrorEl) {
                    this.mirrorEl.style.display = '';
                }
                this.isVisible = bool; // needs to happen before updateElPosition
                this.updateElPosition(); // because was not updating the position while invisible
            }
        }
        else if (this.isVisible) {
            if (this.mirrorEl) {
                this.mirrorEl.style.display = 'none';
            }
            this.isVisible = bool;
        }
    }
    // always async
    stop(needsRevertAnimation, callback) {
        let done = () => {
            this.cleanup();
            callback();
        };
        if (needsRevertAnimation &&
            this.mirrorEl &&
            this.isVisible &&
            this.revertDuration && // if 0, transition won't work
            (this.deltaX || this.deltaY) // if same coords, transition won't work
        ) {
            this.doRevertAnimation(done, this.revertDuration);
        }
        else {
            setTimeout(done, 0);
        }
    }
    doRevertAnimation(callback, revertDuration) {
        let mirrorEl = this.mirrorEl;
        let finalSourceElRect = this.sourceEl.getBoundingClientRect(); // because autoscrolling might have happened
        mirrorEl.style.transition =
            'top ' + revertDuration + 'ms,' +
                'left ' + revertDuration + 'ms';
        applyStyle(mirrorEl, {
            left: finalSourceElRect.left,
            top: finalSourceElRect.top,
        });
        whenTransitionDone(mirrorEl, () => {
            mirrorEl.style.transition = '';
            callback();
        });
    }
    cleanup() {
        if (this.mirrorEl) {
            removeElement(this.mirrorEl);
            this.mirrorEl = null;
        }
        this.sourceEl = null;
    }
    updateElPosition() {
        if (this.sourceEl && this.isVisible) {
            applyStyle(this.getMirrorEl(), {
                left: this.sourceElRect.left + this.deltaX,
                top: this.sourceElRect.top + this.deltaY,
            });
        }
    }
    getMirrorEl() {
        let sourceElRect = this.sourceElRect;
        let mirrorEl = this.mirrorEl;
        if (!mirrorEl) {
            mirrorEl = this.mirrorEl = this.sourceEl.cloneNode(true); // cloneChildren=true
            // we don't want long taps or any mouse interaction causing selection/menus.
            // would use preventSelection(), but that prevents selectstart, causing problems.
            mirrorEl.style.userSelect = 'none';
            mirrorEl.style.webkitUserSelect = 'none';
            mirrorEl.style.pointerEvents = 'none';
            mirrorEl.classList.add('fc-event-dragging');
            applyStyle(mirrorEl, {
                position: 'fixed',
                zIndex: this.zIndex,
                visibility: '',
                boxSizing: 'border-box',
                width: sourceElRect.right - sourceElRect.left,
                height: sourceElRect.bottom - sourceElRect.top,
                right: 'auto',
                bottom: 'auto',
                margin: 0,
            });
            this.parentNode.appendChild(mirrorEl);
        }
        return mirrorEl;
    }
}

/*
Is a cache for a given element's scroll information (all the info that ScrollController stores)
in addition the "client rectangle" of the element.. the area within the scrollbars.

The cache can be in one of two modes:
- doesListening:false - ignores when the container is scrolled by someone else
- doesListening:true - watch for scrolling and update the cache
*/
class ScrollGeomCache extends ScrollController {
    constructor(scrollController, doesListening) {
        super();
        this.handleScroll = () => {
            this.scrollTop = this.scrollController.getScrollTop();
            this.scrollLeft = this.scrollController.getScrollLeft();
            this.handleScrollChange();
        };
        this.scrollController = scrollController;
        this.doesListening = doesListening;
        this.scrollTop = this.origScrollTop = scrollController.getScrollTop();
        this.scrollLeft = this.origScrollLeft = scrollController.getScrollLeft();
        this.scrollWidth = scrollController.getScrollWidth();
        this.scrollHeight = scrollController.getScrollHeight();
        this.clientWidth = scrollController.getClientWidth();
        this.clientHeight = scrollController.getClientHeight();
        this.clientRect = this.computeClientRect(); // do last in case it needs cached values
        if (this.doesListening) {
            this.getEventTarget().addEventListener('scroll', this.handleScroll);
        }
    }
    destroy() {
        if (this.doesListening) {
            this.getEventTarget().removeEventListener('scroll', this.handleScroll);
        }
    }
    getScrollTop() {
        return this.scrollTop;
    }
    getScrollLeft() {
        return this.scrollLeft;
    }
    setScrollTop(top) {
        this.scrollController.setScrollTop(top);
        if (!this.doesListening) {
            // we are not relying on the element to normalize out-of-bounds scroll values
            // so we need to sanitize ourselves
            this.scrollTop = Math.max(Math.min(top, this.getMaxScrollTop()), 0);
            this.handleScrollChange();
        }
    }
    setScrollLeft(top) {
        this.scrollController.setScrollLeft(top);
        if (!this.doesListening) {
            // we are not relying on the element to normalize out-of-bounds scroll values
            // so we need to sanitize ourselves
            this.scrollLeft = Math.max(Math.min(top, this.getMaxScrollLeft()), 0);
            this.handleScrollChange();
        }
    }
    getClientWidth() {
        return this.clientWidth;
    }
    getClientHeight() {
        return this.clientHeight;
    }
    getScrollWidth() {
        return this.scrollWidth;
    }
    getScrollHeight() {
        return this.scrollHeight;
    }
    handleScrollChange() {
    }
}

class ElementScrollGeomCache extends ScrollGeomCache {
    constructor(el, doesListening) {
        super(new ElementScrollController(el), doesListening);
    }
    getEventTarget() {
        return this.scrollController.el;
    }
    computeClientRect() {
        return computeInnerRect(this.scrollController.el);
    }
}

class WindowScrollGeomCache extends ScrollGeomCache {
    constructor(doesListening) {
        super(new WindowScrollController(), doesListening);
    }
    getEventTarget() {
        return window;
    }
    computeClientRect() {
        return {
            left: this.scrollLeft,
            right: this.scrollLeft + this.clientWidth,
            top: this.scrollTop,
            bottom: this.scrollTop + this.clientHeight,
        };
    }
    // the window is the only scroll object that changes it's rectangle relative
    // to the document's topleft as it scrolls
    handleScrollChange() {
        this.clientRect = this.computeClientRect();
    }
}

// If available we are using native "performance" API instead of "Date"
// Read more about it on MDN:
// https://developer.mozilla.org/en-US/docs/Web/API/Performance
const getTime = typeof performance === 'function' ? performance.now : Date.now;
/*
For a pointer interaction, automatically scrolls certain scroll containers when the pointer
approaches the edge.

The caller must call start + handleMove + stop.
*/
class AutoScroller {
    constructor() {
        // options that can be set by caller
        this.isEnabled = true;
        this.scrollQuery = [window, '.fc-scroller'];
        this.edgeThreshold = 50; // pixels
        this.maxVelocity = 300; // pixels per second
        // internal state
        this.pointerScreenX = null;
        this.pointerScreenY = null;
        this.isAnimating = false;
        this.scrollCaches = null;
        // protect against the initial pointerdown being too close to an edge and starting the scroll
        this.everMovedUp = false;
        this.everMovedDown = false;
        this.everMovedLeft = false;
        this.everMovedRight = false;
        this.animate = () => {
            if (this.isAnimating) { // wasn't cancelled between animation calls
                let edge = this.computeBestEdge(this.pointerScreenX + window.scrollX, this.pointerScreenY + window.scrollY);
                if (edge) {
                    let now = getTime();
                    this.handleSide(edge, (now - this.msSinceRequest) / 1000);
                    this.requestAnimation(now);
                }
                else {
                    this.isAnimating = false; // will stop animation
                }
            }
        };
    }
    start(pageX, pageY, scrollStartEl) {
        if (this.isEnabled) {
            this.scrollCaches = this.buildCaches(scrollStartEl);
            this.pointerScreenX = null;
            this.pointerScreenY = null;
            this.everMovedUp = false;
            this.everMovedDown = false;
            this.everMovedLeft = false;
            this.everMovedRight = false;
            this.handleMove(pageX, pageY);
        }
    }
    handleMove(pageX, pageY) {
        if (this.isEnabled) {
            let pointerScreenX = pageX - window.scrollX;
            let pointerScreenY = pageY - window.scrollY;
            let yDelta = this.pointerScreenY === null ? 0 : pointerScreenY - this.pointerScreenY;
            let xDelta = this.pointerScreenX === null ? 0 : pointerScreenX - this.pointerScreenX;
            if (yDelta < 0) {
                this.everMovedUp = true;
            }
            else if (yDelta > 0) {
                this.everMovedDown = true;
            }
            if (xDelta < 0) {
                this.everMovedLeft = true;
            }
            else if (xDelta > 0) {
                this.everMovedRight = true;
            }
            this.pointerScreenX = pointerScreenX;
            this.pointerScreenY = pointerScreenY;
            if (!this.isAnimating) {
                this.isAnimating = true;
                this.requestAnimation(getTime());
            }
        }
    }
    stop() {
        if (this.isEnabled) {
            this.isAnimating = false; // will stop animation
            for (let scrollCache of this.scrollCaches) {
                scrollCache.destroy();
            }
            this.scrollCaches = null;
        }
    }
    requestAnimation(now) {
        this.msSinceRequest = now;
        requestAnimationFrame(this.animate);
    }
    handleSide(edge, seconds) {
        let { scrollCache } = edge;
        let { edgeThreshold } = this;
        let invDistance = edgeThreshold - edge.distance;
        let velocity = // the closer to the edge, the faster we scroll
         ((invDistance * invDistance) / (edgeThreshold * edgeThreshold)) * // quadratic
            this.maxVelocity * seconds;
        let sign = 1;
        switch (edge.name) {
            case 'left':
                sign = -1;
            // falls through
            case 'right':
                scrollCache.setScrollLeft(scrollCache.getScrollLeft() + velocity * sign);
                break;
            case 'top':
                sign = -1;
            // falls through
            case 'bottom':
                scrollCache.setScrollTop(scrollCache.getScrollTop() + velocity * sign);
                break;
        }
    }
    // left/top are relative to document topleft
    computeBestEdge(left, top) {
        let { edgeThreshold } = this;
        let bestSide = null;
        let scrollCaches = this.scrollCaches || [];
        for (let scrollCache of scrollCaches) {
            let rect = scrollCache.clientRect;
            let leftDist = left - rect.left;
            let rightDist = rect.right - left;
            let topDist = top - rect.top;
            let bottomDist = rect.bottom - top;
            // completely within the rect?
            if (leftDist >= 0 && rightDist >= 0 && topDist >= 0 && bottomDist >= 0) {
                if (topDist <= edgeThreshold && this.everMovedUp && scrollCache.canScrollUp() &&
                    (!bestSide || bestSide.distance > topDist)) {
                    bestSide = { scrollCache, name: 'top', distance: topDist };
                }
                if (bottomDist <= edgeThreshold && this.everMovedDown && scrollCache.canScrollDown() &&
                    (!bestSide || bestSide.distance > bottomDist)) {
                    bestSide = { scrollCache, name: 'bottom', distance: bottomDist };
                }
                /*
                TODO: fix broken RTL scrolling. canScrollLeft always returning false
                https://github.com/fullcalendar/fullcalendar/issues/4837
                */
                if (leftDist <= edgeThreshold && this.everMovedLeft && scrollCache.canScrollLeft() &&
                    (!bestSide || bestSide.distance > leftDist)) {
                    bestSide = { scrollCache, name: 'left', distance: leftDist };
                }
                if (rightDist <= edgeThreshold && this.everMovedRight && scrollCache.canScrollRight() &&
                    (!bestSide || bestSide.distance > rightDist)) {
                    bestSide = { scrollCache, name: 'right', distance: rightDist };
                }
            }
        }
        return bestSide;
    }
    buildCaches(scrollStartEl) {
        return this.queryScrollEls(scrollStartEl).map((el) => {
            if (el === window) {
                return new WindowScrollGeomCache(false); // false = don't listen to user-generated scrolls
            }
            return new ElementScrollGeomCache(el, false); // false = don't listen to user-generated scrolls
        });
    }
    queryScrollEls(scrollStartEl) {
        let els = [];
        for (let query of this.scrollQuery) {
            if (typeof query === 'object') {
                els.push(query);
            }
            else {
                /*
                TODO: in the future, always have auto-scroll happen on element where current Hit came from
                Ticket: https://github.com/fullcalendar/fullcalendar/issues/4593
                */
                els.push(...Array.prototype.slice.call(scrollStartEl.getRootNode().querySelectorAll(query)));
            }
        }
        return els;
    }
}

/*
Monitors dragging on an element. Has a number of high-level features:
- minimum distance required before dragging
- minimum wait time ("delay") before dragging
- a mirror element that follows the pointer
*/
class FeaturefulElementDragging extends ElementDragging {
    constructor(containerEl, selector) {
        super(containerEl);
        this.containerEl = containerEl;
        // options that can be directly set by caller
        // the caller can also set the PointerDragging's options as well
        this.delay = null;
        this.minDistance = 0;
        this.touchScrollAllowed = true; // prevents drag from starting and blocks scrolling during drag
        this.mirrorNeedsRevert = false;
        this.isInteracting = false; // is the user validly moving the pointer? lasts until pointerup
        this.isDragging = false; // is it INTENTFULLY dragging? lasts until after revert animation
        this.isDelayEnded = false;
        this.isDistanceSurpassed = false;
        this.delayTimeoutId = null;
        this.onPointerDown = (ev) => {
            if (!this.isDragging) { // so new drag doesn't happen while revert animation is going
                this.isInteracting = true;
                this.isDelayEnded = false;
                this.isDistanceSurpassed = false;
                preventSelection(document.body);
                preventContextMenu(document.body);
                // prevent links from being visited if there's an eventual drag.
                // also prevents selection in older browsers (maybe?).
                // not necessary for touch, besides, browser would complain about passiveness.
                if (!ev.isTouch) {
                    ev.origEvent.preventDefault();
                }
                this.emitter.trigger('pointerdown', ev);
                if (this.isInteracting && // not destroyed via pointerdown handler
                    !this.pointer.shouldIgnoreMove) {
                    // actions related to initiating dragstart+dragmove+dragend...
                    this.mirror.setIsVisible(false); // reset. caller must set-visible
                    this.mirror.start(ev.subjectEl, ev.pageX, ev.pageY); // must happen on first pointer down
                    this.startDelay(ev);
                    if (!this.minDistance) {
                        this.handleDistanceSurpassed(ev);
                    }
                }
            }
        };
        this.onPointerMove = (ev) => {
            if (this.isInteracting) {
                this.emitter.trigger('pointermove', ev);
                if (!this.isDistanceSurpassed) {
                    let minDistance = this.minDistance;
                    let distanceSq; // current distance from the origin, squared
                    let { deltaX, deltaY } = ev;
                    distanceSq = deltaX * deltaX + deltaY * deltaY;
                    if (distanceSq >= minDistance * minDistance) { // use pythagorean theorem
                        this.handleDistanceSurpassed(ev);
                    }
                }
                if (this.isDragging) {
                    // a real pointer move? (not one simulated by scrolling)
                    if (ev.origEvent.type !== 'scroll') {
                        this.mirror.handleMove(ev.pageX, ev.pageY);
                        this.autoScroller.handleMove(ev.pageX, ev.pageY);
                    }
                    this.emitter.trigger('dragmove', ev);
                }
            }
        };
        this.onPointerUp = (ev) => {
            if (this.isInteracting) {
                this.isInteracting = false;
                allowSelection(document.body);
                allowContextMenu(document.body);
                this.emitter.trigger('pointerup', ev); // can potentially set mirrorNeedsRevert
                if (this.isDragging) {
                    this.autoScroller.stop();
                    this.tryStopDrag(ev); // which will stop the mirror
                }
                if (this.delayTimeoutId) {
                    clearTimeout(this.delayTimeoutId);
                    this.delayTimeoutId = null;
                }
            }
        };
        let pointer = this.pointer = new PointerDragging(containerEl);
        pointer.emitter.on('pointerdown', this.onPointerDown);
        pointer.emitter.on('pointermove', this.onPointerMove);
        pointer.emitter.on('pointerup', this.onPointerUp);
        if (selector) {
            pointer.selector = selector;
        }
        this.mirror = new ElementMirror();
        this.autoScroller = new AutoScroller();
    }
    destroy() {
        this.pointer.destroy();
        // HACK: simulate a pointer-up to end the current drag
        // TODO: fire 'dragend' directly and stop interaction. discourage use of pointerup event (b/c might not fire)
        this.onPointerUp({});
    }
    startDelay(ev) {
        if (typeof this.delay === 'number') {
            this.delayTimeoutId = setTimeout(() => {
                this.delayTimeoutId = null;
                this.handleDelayEnd(ev);
            }, this.delay); // not assignable to number!
        }
        else {
            this.handleDelayEnd(ev);
        }
    }
    handleDelayEnd(ev) {
        this.isDelayEnded = true;
        this.tryStartDrag(ev);
    }
    handleDistanceSurpassed(ev) {
        this.isDistanceSurpassed = true;
        this.tryStartDrag(ev);
    }
    tryStartDrag(ev) {
        if (this.isDelayEnded && this.isDistanceSurpassed) {
            if (!this.pointer.wasTouchScroll || this.touchScrollAllowed) {
                this.isDragging = true;
                this.mirrorNeedsRevert = false;
                this.autoScroller.start(ev.pageX, ev.pageY, this.containerEl);
                this.emitter.trigger('dragstart', ev);
                if (this.touchScrollAllowed === false) {
                    this.pointer.cancelTouchScroll();
                }
            }
        }
    }
    tryStopDrag(ev) {
        // .stop() is ALWAYS asynchronous, which we NEED because we want all pointerup events
        // that come from the document to fire beforehand. much more convenient this way.
        this.mirror.stop(this.mirrorNeedsRevert, this.stopDrag.bind(this, ev));
    }
    stopDrag(ev) {
        this.isDragging = false;
        this.emitter.trigger('dragend', ev);
    }
    // fill in the implementations...
    setIgnoreMove(bool) {
        this.pointer.shouldIgnoreMove = bool;
    }
    setMirrorIsVisible(bool) {
        this.mirror.setIsVisible(bool);
    }
    setMirrorNeedsRevert(bool) {
        this.mirrorNeedsRevert = bool;
    }
    setAutoScrollEnabled(bool) {
        this.autoScroller.isEnabled = bool;
    }
}

/*
When this class is instantiated, it records the offset of an element (relative to the document topleft),
and continues to monitor scrolling, updating the cached coordinates if it needs to.
Does not access the DOM after instantiation, so highly performant.

Also keeps track of all scrolling/overflow:hidden containers that are parents of the given element
and an determine if a given point is inside the combined clipping rectangle.
*/
class OffsetTracker {
    constructor(el) {
        this.el = el;
        this.origRect = computeRect(el);
        // will work fine for divs that have overflow:hidden
        this.scrollCaches = getClippingParents(el).map((scrollEl) => new ElementScrollGeomCache(scrollEl, true));
    }
    destroy() {
        for (let scrollCache of this.scrollCaches) {
            scrollCache.destroy();
        }
    }
    computeLeft() {
        let left = this.origRect.left;
        for (let scrollCache of this.scrollCaches) {
            left += scrollCache.origScrollLeft - scrollCache.getScrollLeft();
        }
        return left;
    }
    computeTop() {
        let top = this.origRect.top;
        for (let scrollCache of this.scrollCaches) {
            top += scrollCache.origScrollTop - scrollCache.getScrollTop();
        }
        return top;
    }
    isWithinClipping(pageX, pageY) {
        let point = { left: pageX, top: pageY };
        for (let scrollCache of this.scrollCaches) {
            if (!isIgnoredClipping(scrollCache.getEventTarget()) &&
                !pointInsideRect(point, scrollCache.clientRect)) {
                return false;
            }
        }
        return true;
    }
}
// certain clipping containers should never constrain interactions, like <html> and <body>
// https://github.com/fullcalendar/fullcalendar/issues/3615
function isIgnoredClipping(node) {
    let tagName = node.tagName;
    return tagName === 'HTML' || tagName === 'BODY';
}

/*
Tracks movement over multiple droppable areas (aka "hits")
that exist in one or more DateComponents.
Relies on an existing draggable.

emits:
- pointerdown
- dragstart
- hitchange - fires initially, even if not over a hit
- pointerup
- (hitchange - again, to null, if ended over a hit)
- dragend
*/
class HitDragging {
    constructor(dragging, droppableStore) {
        // options that can be set by caller
        this.useSubjectCenter = false;
        this.requireInitial = true; // if doesn't start out on a hit, won't emit any events
        this.disablePointCheck = false;
        this.initialHit = null;
        this.movingHit = null;
        this.finalHit = null; // won't ever be populated if shouldIgnoreMove
        this.handlePointerDown = (ev) => {
            let { dragging } = this;
            this.initialHit = null;
            this.movingHit = null;
            this.finalHit = null;
            this.prepareHits();
            this.processFirstCoord(ev);
            if (this.initialHit || !this.requireInitial) {
                dragging.setIgnoreMove(false);
                // TODO: fire this before computing processFirstCoord, so listeners can cancel. this gets fired by almost every handler :(
                this.emitter.trigger('pointerdown', ev);
            }
            else {
                dragging.setIgnoreMove(true);
            }
        };
        this.handleDragStart = (ev) => {
            this.emitter.trigger('dragstart', ev);
            this.handleMove(ev, true); // force = fire even if initially null
        };
        this.handleDragMove = (ev) => {
            this.emitter.trigger('dragmove', ev);
            this.handleMove(ev);
        };
        this.handlePointerUp = (ev) => {
            this.releaseHits();
            this.emitter.trigger('pointerup', ev);
        };
        this.handleDragEnd = (ev) => {
            if (this.movingHit) {
                this.emitter.trigger('hitupdate', null, true, ev);
            }
            this.finalHit = this.movingHit;
            this.movingHit = null;
            this.emitter.trigger('dragend', ev);
        };
        this.droppableStore = droppableStore;
        dragging.emitter.on('pointerdown', this.handlePointerDown);
        dragging.emitter.on('dragstart', this.handleDragStart);
        dragging.emitter.on('dragmove', this.handleDragMove);
        dragging.emitter.on('pointerup', this.handlePointerUp);
        dragging.emitter.on('dragend', this.handleDragEnd);
        this.dragging = dragging;
        this.emitter = new Emitter();
    }
    // sets initialHit
    // sets coordAdjust
    processFirstCoord(ev) {
        let origPoint = { left: ev.pageX, top: ev.pageY };
        let adjustedPoint = origPoint;
        let subjectEl = ev.subjectEl;
        let subjectRect;
        if (subjectEl instanceof HTMLElement) { // i.e. not a Document/ShadowRoot
            subjectRect = computeRect(subjectEl);
            adjustedPoint = constrainPoint(adjustedPoint, subjectRect);
        }
        let initialHit = this.initialHit = this.queryHitForOffset(adjustedPoint.left, adjustedPoint.top);
        if (initialHit) {
            if (this.useSubjectCenter && subjectRect) {
                let slicedSubjectRect = intersectRects(subjectRect, initialHit.rect);
                if (slicedSubjectRect) {
                    adjustedPoint = getRectCenter(slicedSubjectRect);
                }
            }
            this.coordAdjust = diffPoints(adjustedPoint, origPoint);
        }
        else {
            this.coordAdjust = { left: 0, top: 0 };
        }
    }
    handleMove(ev, forceHandle) {
        let hit = this.queryHitForOffset(ev.pageX + this.coordAdjust.left, ev.pageY + this.coordAdjust.top);
        if (forceHandle || !isHitsEqual(this.movingHit, hit)) {
            this.movingHit = hit;
            this.emitter.trigger('hitupdate', hit, false, ev);
        }
    }
    prepareHits() {
        this.offsetTrackers = mapHash(this.droppableStore, (interactionSettings) => {
            interactionSettings.component.prepareHits();
            return new OffsetTracker(interactionSettings.el);
        });
    }
    releaseHits() {
        let { offsetTrackers } = this;
        for (let id in offsetTrackers) {
            offsetTrackers[id].destroy();
        }
        this.offsetTrackers = {};
    }
    queryHitForOffset(offsetLeft, offsetTop) {
        let { droppableStore, offsetTrackers } = this;
        let bestHit = null;
        for (let id in droppableStore) {
            let component = droppableStore[id].component;
            let offsetTracker = offsetTrackers[id];
            if (offsetTracker && // wasn't destroyed mid-drag
                offsetTracker.isWithinClipping(offsetLeft, offsetTop)) {
                let originLeft = offsetTracker.computeLeft();
                let originTop = offsetTracker.computeTop();
                let positionLeft = offsetLeft - originLeft;
                let positionTop = offsetTop - originTop;
                let { origRect } = offsetTracker;
                let width = origRect.right - origRect.left;
                let height = origRect.bottom - origRect.top;
                if (
                // must be within the element's bounds
                positionLeft >= 0 && positionLeft < width &&
                    positionTop >= 0 && positionTop < height) {
                    let hit = component.queryHit(positionLeft, positionTop, width, height);
                    if (hit && (
                    // make sure the hit is within activeRange, meaning it's not a dead cell
                    rangeContainsRange(hit.dateProfile.activeRange, hit.dateSpan.range)) &&
                        // Ensure the component we are querying for the hit is accessibly my the pointer
                        // Prevents obscured calendars (ex: under a modal dialog) from accepting hit
                        // https://github.com/fullcalendar/fullcalendar/issues/5026
                        (this.disablePointCheck ||
                            offsetTracker.el.contains(document.elementFromPoint(
                            // add-back origins to get coordinate relative to top-left of window viewport
                            positionLeft + originLeft - window.scrollX, positionTop + originTop - window.scrollY))) &&
                        (!bestHit || hit.layer > bestHit.layer)) {
                        hit.componentId = id;
                        hit.context = component.context;
                        // TODO: better way to re-orient rectangle
                        hit.rect.left += originLeft;
                        hit.rect.right += originLeft;
                        hit.rect.top += originTop;
                        hit.rect.bottom += originTop;
                        bestHit = hit;
                    }
                }
            }
        }
        return bestHit;
    }
}
function isHitsEqual(hit0, hit1) {
    if (!hit0 && !hit1) {
        return true;
    }
    if (Boolean(hit0) !== Boolean(hit1)) {
        return false;
    }
    return isDateSpansEqual(hit0.dateSpan, hit1.dateSpan);
}

function buildDatePointApiWithContext(dateSpan, context) {
    let props = {};
    for (let transform of context.pluginHooks.datePointTransforms) {
        Object.assign(props, transform(dateSpan, context));
    }
    Object.assign(props, buildDatePointApi(dateSpan, context.dateEnv));
    return props;
}
function buildDatePointApi(span, dateEnv) {
    return {
        date: dateEnv.toDate(span.range.start),
        dateStr: dateEnv.formatIso(span.range.start, { omitTime: span.allDay }),
        allDay: span.allDay,
    };
}

/*
Monitors when the user clicks on a specific date/time of a component.
A pointerdown+pointerup on the same "hit" constitutes a click.
*/
class DateClicking extends Interaction {
    constructor(settings) {
        super(settings);
        this.handlePointerDown = (pev) => {
            let { dragging } = this;
            let downEl = pev.origEvent.target;
            // do this in pointerdown (not dragend) because DOM might be mutated by the time dragend is fired
            dragging.setIgnoreMove(!this.component.isValidDateDownEl(downEl));
        };
        // won't even fire if moving was ignored
        this.handleDragEnd = (ev) => {
            let { component } = this;
            let { pointer } = this.dragging;
            if (!pointer.wasTouchScroll) {
                let { initialHit, finalHit } = this.hitDragging;
                if (initialHit && finalHit && isHitsEqual(initialHit, finalHit)) {
                    let { context } = component;
                    let arg = Object.assign(Object.assign({}, buildDatePointApiWithContext(initialHit.dateSpan, context)), { dayEl: initialHit.dayEl, jsEvent: ev.origEvent, view: context.viewApi || context.calendarApi.view });
                    context.emitter.trigger('dateClick', arg);
                }
            }
        };
        // we DO want to watch pointer moves because otherwise finalHit won't get populated
        this.dragging = new FeaturefulElementDragging(settings.el);
        this.dragging.autoScroller.isEnabled = false;
        let hitDragging = this.hitDragging = new HitDragging(this.dragging, interactionSettingsToStore(settings));
        hitDragging.emitter.on('pointerdown', this.handlePointerDown);
        hitDragging.emitter.on('dragend', this.handleDragEnd);
    }
    destroy() {
        this.dragging.destroy();
    }
}

/*
Tracks when the user selects a portion of time of a component,
constituted by a drag over date cells, with a possible delay at the beginning of the drag.
*/
class DateSelecting extends Interaction {
    constructor(settings) {
        super(settings);
        this.dragSelection = null;
        this.handlePointerDown = (ev) => {
            let { component, dragging } = this;
            let { options } = component.context;
            let canSelect = options.selectable &&
                component.isValidDateDownEl(ev.origEvent.target);
            // don't bother to watch expensive moves if component won't do selection
            dragging.setIgnoreMove(!canSelect);
            // if touch, require user to hold down
            dragging.delay = ev.isTouch ? getComponentTouchDelay$1(component) : null;
        };
        this.handleDragStart = (ev) => {
            this.component.context.calendarApi.unselect(ev); // unselect previous selections
        };
        this.handleHitUpdate = (hit, isFinal) => {
            let { context } = this.component;
            let dragSelection = null;
            let isInvalid = false;
            if (hit) {
                let initialHit = this.hitDragging.initialHit;
                let disallowed = hit.componentId === initialHit.componentId
                    && this.isHitComboAllowed
                    && !this.isHitComboAllowed(initialHit, hit);
                if (!disallowed) {
                    dragSelection = joinHitsIntoSelection(initialHit, hit, context.pluginHooks.dateSelectionTransformers);
                }
                if (!dragSelection || !isDateSelectionValid(dragSelection, hit.dateProfile, context)) {
                    isInvalid = true;
                    dragSelection = null;
                }
            }
            if (dragSelection) {
                context.dispatch({ type: 'SELECT_DATES', selection: dragSelection });
            }
            else if (!isFinal) { // only unselect if moved away while dragging
                context.dispatch({ type: 'UNSELECT_DATES' });
            }
            if (!isInvalid) {
                enableCursor();
            }
            else {
                disableCursor();
            }
            if (!isFinal) {
                this.dragSelection = dragSelection; // only clear if moved away from all hits while dragging
            }
        };
        this.handlePointerUp = (pev) => {
            if (this.dragSelection) {
                // selection is already rendered, so just need to report selection
                triggerDateSelect(this.dragSelection, pev, this.component.context);
                this.dragSelection = null;
            }
        };
        let { component } = settings;
        let { options } = component.context;
        let dragging = this.dragging = new FeaturefulElementDragging(settings.el);
        dragging.touchScrollAllowed = false;
        dragging.minDistance = options.selectMinDistance || 0;
        dragging.autoScroller.isEnabled = options.dragScroll;
        let hitDragging = this.hitDragging = new HitDragging(this.dragging, interactionSettingsToStore(settings));
        hitDragging.emitter.on('pointerdown', this.handlePointerDown);
        hitDragging.emitter.on('dragstart', this.handleDragStart);
        hitDragging.emitter.on('hitupdate', this.handleHitUpdate);
        hitDragging.emitter.on('pointerup', this.handlePointerUp);
    }
    destroy() {
        this.dragging.destroy();
    }
}
function getComponentTouchDelay$1(component) {
    let { options } = component.context;
    let delay = options.selectLongPressDelay;
    if (delay == null) {
        delay = options.longPressDelay;
    }
    return delay;
}
function joinHitsIntoSelection(hit0, hit1, dateSelectionTransformers) {
    let dateSpan0 = hit0.dateSpan;
    let dateSpan1 = hit1.dateSpan;
    let ms = [
        dateSpan0.range.start,
        dateSpan0.range.end,
        dateSpan1.range.start,
        dateSpan1.range.end,
    ];
    ms.sort(compareNumbers);
    let props = {};
    for (let transformer of dateSelectionTransformers) {
        let res = transformer(hit0, hit1);
        if (res === false) {
            return null;
        }
        if (res) {
            Object.assign(props, res);
        }
    }
    props.range = { start: ms[0], end: ms[3] };
    props.allDay = dateSpan0.allDay;
    return props;
}

class EventDragging extends Interaction {
    constructor(settings) {
        super(settings);
        // internal state
        this.subjectEl = null;
        this.subjectSeg = null; // the seg being selected/dragged
        this.isDragging = false;
        this.eventRange = null;
        this.relevantEvents = null; // the events being dragged
        this.receivingContext = null;
        this.validMutation = null;
        this.mutatedRelevantEvents = null;
        this.handlePointerDown = (ev) => {
            let origTarget = ev.origEvent.target;
            let { component, dragging } = this;
            let { mirror } = dragging;
            let { options } = component.context;
            let initialContext = component.context;
            this.subjectEl = ev.subjectEl;
            let subjectSeg = this.subjectSeg = getElSeg(ev.subjectEl);
            let eventRange = this.eventRange = subjectSeg.eventRange;
            let eventInstanceId = eventRange.instance.instanceId;
            this.relevantEvents = getRelevantEvents(initialContext.getCurrentData().eventStore, eventInstanceId);
            dragging.minDistance = ev.isTouch ? 0 : options.eventDragMinDistance;
            dragging.delay =
                // only do a touch delay if touch and this event hasn't been selected yet
                (ev.isTouch && eventInstanceId !== component.props.eventSelection) ?
                    getComponentTouchDelay(component) :
                    null;
            if (options.fixedMirrorParent) {
                mirror.parentNode = options.fixedMirrorParent;
            }
            else {
                mirror.parentNode = elementClosest(origTarget, '.fc');
            }
            mirror.revertDuration = options.dragRevertDuration;
            let isValid = component.isValidSegDownEl(origTarget) &&
                !elementClosest(origTarget, '.fc-event-resizer'); // NOT on a resizer
            dragging.setIgnoreMove(!isValid);
            // disable dragging for elements that are resizable (ie, selectable)
            // but are not draggable
            this.isDragging = isValid &&
                ev.subjectEl.classList.contains('fc-event-draggable');
        };
        this.handleDragStart = (ev) => {
            let initialContext = this.component.context;
            let eventRange = this.eventRange;
            let eventInstanceId = eventRange.instance.instanceId;
            if (ev.isTouch) {
                // need to select a different event?
                if (eventInstanceId !== this.component.props.eventSelection) {
                    initialContext.dispatch({ type: 'SELECT_EVENT', eventInstanceId });
                }
            }
            else {
                // if now using mouse, but was previous touch interaction, clear selected event
                initialContext.dispatch({ type: 'UNSELECT_EVENT' });
            }
            if (this.isDragging) {
                initialContext.calendarApi.unselect(ev); // unselect *date* selection
                initialContext.emitter.trigger('eventDragStart', {
                    el: this.subjectEl,
                    event: new EventImpl(initialContext, eventRange.def, eventRange.instance),
                    jsEvent: ev.origEvent,
                    view: initialContext.viewApi,
                });
            }
        };
        this.handleHitUpdate = (hit, isFinal) => {
            if (!this.isDragging) {
                return;
            }
            let relevantEvents = this.relevantEvents;
            let initialHit = this.hitDragging.initialHit;
            let initialContext = this.component.context;
            // states based on new hit
            let receivingContext = null;
            let mutation = null;
            let mutatedRelevantEvents = null;
            let isInvalid = false;
            let interaction = {
                affectedEvents: relevantEvents,
                mutatedEvents: createEmptyEventStore(),
                isEvent: true,
            };
            if (hit) {
                receivingContext = hit.context;
                let receivingOptions = receivingContext.options;
                if (initialContext === receivingContext ||
                    (receivingOptions.editable && receivingOptions.droppable)) {
                    mutation = computeEventMutation(initialHit, hit, this.eventRange.instance.range.start, receivingContext.getCurrentData().pluginHooks.eventDragMutationMassagers);
                    if (mutation) {
                        mutatedRelevantEvents = applyMutationToEventStore(relevantEvents, receivingContext.getCurrentData().eventUiBases, mutation, receivingContext);
                        interaction.mutatedEvents = mutatedRelevantEvents;
                        if (!isInteractionValid(interaction, hit.dateProfile, receivingContext)) {
                            isInvalid = true;
                            mutation = null;
                            mutatedRelevantEvents = null;
                            interaction.mutatedEvents = createEmptyEventStore();
                        }
                    }
                }
                else {
                    receivingContext = null;
                }
            }
            this.displayDrag(receivingContext, interaction);
            if (!isInvalid) {
                enableCursor();
            }
            else {
                disableCursor();
            }
            if (!isFinal) {
                if (initialContext === receivingContext && // TODO: write test for this
                    isHitsEqual(initialHit, hit)) {
                    mutation = null;
                }
                this.dragging.setMirrorNeedsRevert(!mutation);
                // render the mirror if no already-rendered mirror
                // TODO: wish we could somehow wait for dispatch to guarantee render
                this.dragging.setMirrorIsVisible(!hit || !this.subjectEl.getRootNode().querySelector('.fc-event-mirror'));
                // assign states based on new hit
                this.receivingContext = receivingContext;
                this.validMutation = mutation;
                this.mutatedRelevantEvents = mutatedRelevantEvents;
            }
        };
        this.handlePointerUp = () => {
            if (!this.isDragging) {
                this.cleanup(); // because handleDragEnd won't fire
            }
        };
        this.handleDragEnd = (ev) => {
            if (this.isDragging) {
                let initialContext = this.component.context;
                let initialView = initialContext.viewApi;
                let { receivingContext, validMutation } = this;
                let eventDef = this.eventRange.def;
                let eventInstance = this.eventRange.instance;
                let eventApi = new EventImpl(initialContext, eventDef, eventInstance);
                let relevantEvents = this.relevantEvents;
                let mutatedRelevantEvents = this.mutatedRelevantEvents;
                let { finalHit } = this.hitDragging;
                this.clearDrag(); // must happen after revert animation
                initialContext.emitter.trigger('eventDragStop', {
                    el: this.subjectEl,
                    event: eventApi,
                    jsEvent: ev.origEvent,
                    view: initialView,
                });
                if (validMutation) {
                    // dropped within same calendar
                    if (receivingContext === initialContext) {
                        let updatedEventApi = new EventImpl(initialContext, mutatedRelevantEvents.defs[eventDef.defId], eventInstance ? mutatedRelevantEvents.instances[eventInstance.instanceId] : null);
                        initialContext.dispatch({
                            type: 'MERGE_EVENTS',
                            eventStore: mutatedRelevantEvents,
                        });
                        let eventChangeArg = {
                            oldEvent: eventApi,
                            event: updatedEventApi,
                            relatedEvents: buildEventApis(mutatedRelevantEvents, initialContext, eventInstance),
                            revert() {
                                initialContext.dispatch({
                                    type: 'MERGE_EVENTS',
                                    eventStore: relevantEvents, // the pre-change data
                                });
                            },
                        };
                        let transformed = {};
                        for (let transformer of initialContext.getCurrentData().pluginHooks.eventDropTransformers) {
                            Object.assign(transformed, transformer(validMutation, initialContext));
                        }
                        initialContext.emitter.trigger('eventDrop', Object.assign(Object.assign(Object.assign({}, eventChangeArg), transformed), { el: ev.subjectEl, delta: validMutation.datesDelta, jsEvent: ev.origEvent, view: initialView }));
                        initialContext.emitter.trigger('eventChange', eventChangeArg);
                        // dropped in different calendar
                    }
                    else if (receivingContext) {
                        let eventRemoveArg = {
                            event: eventApi,
                            relatedEvents: buildEventApis(relevantEvents, initialContext, eventInstance),
                            revert() {
                                initialContext.dispatch({
                                    type: 'MERGE_EVENTS',
                                    eventStore: relevantEvents,
                                });
                            },
                        };
                        initialContext.emitter.trigger('eventLeave', Object.assign(Object.assign({}, eventRemoveArg), { draggedEl: ev.subjectEl, view: initialView }));
                        initialContext.dispatch({
                            type: 'REMOVE_EVENTS',
                            eventStore: relevantEvents,
                        });
                        initialContext.emitter.trigger('eventRemove', eventRemoveArg);
                        let addedEventDef = mutatedRelevantEvents.defs[eventDef.defId];
                        let addedEventInstance = mutatedRelevantEvents.instances[eventInstance.instanceId];
                        let addedEventApi = new EventImpl(receivingContext, addedEventDef, addedEventInstance);
                        receivingContext.dispatch({
                            type: 'MERGE_EVENTS',
                            eventStore: mutatedRelevantEvents,
                        });
                        let eventAddArg = {
                            event: addedEventApi,
                            relatedEvents: buildEventApis(mutatedRelevantEvents, receivingContext, addedEventInstance),
                            revert() {
                                receivingContext.dispatch({
                                    type: 'REMOVE_EVENTS',
                                    eventStore: mutatedRelevantEvents,
                                });
                            },
                        };
                        receivingContext.emitter.trigger('eventAdd', eventAddArg);
                        if (ev.isTouch) {
                            receivingContext.dispatch({
                                type: 'SELECT_EVENT',
                                eventInstanceId: eventInstance.instanceId,
                            });
                        }
                        receivingContext.emitter.trigger('drop', Object.assign(Object.assign({}, buildDatePointApiWithContext(finalHit.dateSpan, receivingContext)), { draggedEl: ev.subjectEl, jsEvent: ev.origEvent, view: finalHit.context.viewApi }));
                        receivingContext.emitter.trigger('eventReceive', Object.assign(Object.assign({}, eventAddArg), { draggedEl: ev.subjectEl, view: finalHit.context.viewApi }));
                    }
                }
                else {
                    initialContext.emitter.trigger('_noEventDrop');
                }
            }
            this.cleanup();
        };
        let { component } = this;
        let { options } = component.context;
        let dragging = this.dragging = new FeaturefulElementDragging(settings.el);
        dragging.pointer.selector = EventDragging.SELECTOR;
        dragging.touchScrollAllowed = false;
        dragging.autoScroller.isEnabled = options.dragScroll;
        let hitDragging = this.hitDragging = new HitDragging(this.dragging, interactionSettingsStore);
        hitDragging.useSubjectCenter = settings.useEventCenter;
        hitDragging.emitter.on('pointerdown', this.handlePointerDown);
        hitDragging.emitter.on('dragstart', this.handleDragStart);
        hitDragging.emitter.on('hitupdate', this.handleHitUpdate);
        hitDragging.emitter.on('pointerup', this.handlePointerUp);
        hitDragging.emitter.on('dragend', this.handleDragEnd);
    }
    destroy() {
        this.dragging.destroy();
    }
    // render a drag state on the next receivingCalendar
    displayDrag(nextContext, state) {
        let initialContext = this.component.context;
        let prevContext = this.receivingContext;
        // does the previous calendar need to be cleared?
        if (prevContext && prevContext !== nextContext) {
            // does the initial calendar need to be cleared?
            // if so, don't clear all the way. we still need to to hide the affectedEvents
            if (prevContext === initialContext) {
                prevContext.dispatch({
                    type: 'SET_EVENT_DRAG',
                    state: {
                        affectedEvents: state.affectedEvents,
                        mutatedEvents: createEmptyEventStore(),
                        isEvent: true,
                    },
                });
                // completely clear the old calendar if it wasn't the initial
            }
            else {
                prevContext.dispatch({ type: 'UNSET_EVENT_DRAG' });
            }
        }
        if (nextContext) {
            nextContext.dispatch({ type: 'SET_EVENT_DRAG', state });
        }
    }
    clearDrag() {
        let initialCalendar = this.component.context;
        let { receivingContext } = this;
        if (receivingContext) {
            receivingContext.dispatch({ type: 'UNSET_EVENT_DRAG' });
        }
        // the initial calendar might have an dummy drag state from displayDrag
        if (initialCalendar !== receivingContext) {
            initialCalendar.dispatch({ type: 'UNSET_EVENT_DRAG' });
        }
    }
    cleanup() {
        this.subjectSeg = null;
        this.isDragging = false;
        this.eventRange = null;
        this.relevantEvents = null;
        this.receivingContext = null;
        this.validMutation = null;
        this.mutatedRelevantEvents = null;
    }
}
// TODO: test this in IE11
// QUESTION: why do we need it on the resizable???
EventDragging.SELECTOR = '.fc-event-draggable, .fc-event-resizable';
function computeEventMutation(hit0, hit1, eventInstanceStart, massagers) {
    let dateSpan0 = hit0.dateSpan;
    let dateSpan1 = hit1.dateSpan;
    let date0 = dateSpan0.range.start;
    let date1 = dateSpan1.range.start;
    let standardProps = {};
    if (dateSpan0.allDay !== dateSpan1.allDay) {
        standardProps.allDay = dateSpan1.allDay;
        standardProps.hasEnd = hit1.context.options.allDayMaintainDuration;
        if (dateSpan1.allDay) {
            // means date1 is already start-of-day,
            // but date0 needs to be converted
            date0 = startOfDay(eventInstanceStart);
        }
        else {
            // Moving from allDate->timed
            // Doesn't matter where on the event the drag began, mutate the event's start-date to date1
            date0 = eventInstanceStart;
        }
    }
    let delta = diffDates(date0, date1, hit0.context.dateEnv, hit0.componentId === hit1.componentId ?
        hit0.largeUnit :
        null);
    if (delta.milliseconds) { // has hours/minutes/seconds
        standardProps.allDay = false;
    }
    let mutation = {
        datesDelta: delta,
        standardProps,
    };
    for (let massager of massagers) {
        massager(mutation, hit0, hit1);
    }
    return mutation;
}
function getComponentTouchDelay(component) {
    let { options } = component.context;
    let delay = options.eventLongPressDelay;
    if (delay == null) {
        delay = options.longPressDelay;
    }
    return delay;
}

class EventResizing extends Interaction {
    constructor(settings) {
        super(settings);
        // internal state
        this.draggingSegEl = null;
        this.draggingSeg = null; // TODO: rename to resizingSeg? subjectSeg?
        this.eventRange = null;
        this.relevantEvents = null;
        this.validMutation = null;
        this.mutatedRelevantEvents = null;
        this.handlePointerDown = (ev) => {
            let { component } = this;
            let segEl = this.querySegEl(ev);
            let seg = getElSeg(segEl);
            let eventRange = this.eventRange = seg.eventRange;
            this.dragging.minDistance = component.context.options.eventDragMinDistance;
            // if touch, need to be working with a selected event
            this.dragging.setIgnoreMove(!this.component.isValidSegDownEl(ev.origEvent.target) ||
                (ev.isTouch && this.component.props.eventSelection !== eventRange.instance.instanceId));
        };
        this.handleDragStart = (ev) => {
            let { context } = this.component;
            let eventRange = this.eventRange;
            this.relevantEvents = getRelevantEvents(context.getCurrentData().eventStore, this.eventRange.instance.instanceId);
            let segEl = this.querySegEl(ev);
            this.draggingSegEl = segEl;
            this.draggingSeg = getElSeg(segEl);
            context.calendarApi.unselect();
            context.emitter.trigger('eventResizeStart', {
                el: segEl,
                event: new EventImpl(context, eventRange.def, eventRange.instance),
                jsEvent: ev.origEvent,
                view: context.viewApi,
            });
        };
        this.handleHitUpdate = (hit, isFinal, ev) => {
            let { context } = this.component;
            let relevantEvents = this.relevantEvents;
            let initialHit = this.hitDragging.initialHit;
            let eventInstance = this.eventRange.instance;
            let mutation = null;
            let mutatedRelevantEvents = null;
            let isInvalid = false;
            let interaction = {
                affectedEvents: relevantEvents,
                mutatedEvents: createEmptyEventStore(),
                isEvent: true,
            };
            if (hit) {
                let disallowed = hit.componentId === initialHit.componentId
                    && this.isHitComboAllowed
                    && !this.isHitComboAllowed(initialHit, hit);
                if (!disallowed) {
                    mutation = computeMutation(initialHit, hit, ev.subjectEl.classList.contains('fc-event-resizer-start'), eventInstance.range);
                }
            }
            if (mutation) {
                mutatedRelevantEvents = applyMutationToEventStore(relevantEvents, context.getCurrentData().eventUiBases, mutation, context);
                interaction.mutatedEvents = mutatedRelevantEvents;
                if (!isInteractionValid(interaction, hit.dateProfile, context)) {
                    isInvalid = true;
                    mutation = null;
                    mutatedRelevantEvents = null;
                    interaction.mutatedEvents = null;
                }
            }
            if (mutatedRelevantEvents) {
                context.dispatch({
                    type: 'SET_EVENT_RESIZE',
                    state: interaction,
                });
            }
            else {
                context.dispatch({ type: 'UNSET_EVENT_RESIZE' });
            }
            if (!isInvalid) {
                enableCursor();
            }
            else {
                disableCursor();
            }
            if (!isFinal) {
                if (mutation && isHitsEqual(initialHit, hit)) {
                    mutation = null;
                }
                this.validMutation = mutation;
                this.mutatedRelevantEvents = mutatedRelevantEvents;
            }
        };
        this.handleDragEnd = (ev) => {
            let { context } = this.component;
            let eventDef = this.eventRange.def;
            let eventInstance = this.eventRange.instance;
            let eventApi = new EventImpl(context, eventDef, eventInstance);
            let relevantEvents = this.relevantEvents;
            let mutatedRelevantEvents = this.mutatedRelevantEvents;
            context.emitter.trigger('eventResizeStop', {
                el: this.draggingSegEl,
                event: eventApi,
                jsEvent: ev.origEvent,
                view: context.viewApi,
            });
            if (this.validMutation) {
                let updatedEventApi = new EventImpl(context, mutatedRelevantEvents.defs[eventDef.defId], eventInstance ? mutatedRelevantEvents.instances[eventInstance.instanceId] : null);
                context.dispatch({
                    type: 'MERGE_EVENTS',
                    eventStore: mutatedRelevantEvents,
                });
                let eventChangeArg = {
                    oldEvent: eventApi,
                    event: updatedEventApi,
                    relatedEvents: buildEventApis(mutatedRelevantEvents, context, eventInstance),
                    revert() {
                        context.dispatch({
                            type: 'MERGE_EVENTS',
                            eventStore: relevantEvents, // the pre-change events
                        });
                    },
                };
                context.emitter.trigger('eventResize', Object.assign(Object.assign({}, eventChangeArg), { el: this.draggingSegEl, startDelta: this.validMutation.startDelta || createDuration(0), endDelta: this.validMutation.endDelta || createDuration(0), jsEvent: ev.origEvent, view: context.viewApi }));
                context.emitter.trigger('eventChange', eventChangeArg);
            }
            else {
                context.emitter.trigger('_noEventResize');
            }
            // reset all internal state
            this.draggingSeg = null;
            this.relevantEvents = null;
            this.validMutation = null;
            // okay to keep eventInstance around. useful to set it in handlePointerDown
        };
        let { component } = settings;
        let dragging = this.dragging = new FeaturefulElementDragging(settings.el);
        dragging.pointer.selector = '.fc-event-resizer';
        dragging.touchScrollAllowed = false;
        dragging.autoScroller.isEnabled = component.context.options.dragScroll;
        let hitDragging = this.hitDragging = new HitDragging(this.dragging, interactionSettingsToStore(settings));
        hitDragging.emitter.on('pointerdown', this.handlePointerDown);
        hitDragging.emitter.on('dragstart', this.handleDragStart);
        hitDragging.emitter.on('hitupdate', this.handleHitUpdate);
        hitDragging.emitter.on('dragend', this.handleDragEnd);
    }
    destroy() {
        this.dragging.destroy();
    }
    querySegEl(ev) {
        return elementClosest(ev.subjectEl, '.fc-event');
    }
}
function computeMutation(hit0, hit1, isFromStart, instanceRange) {
    let dateEnv = hit0.context.dateEnv;
    let date0 = hit0.dateSpan.range.start;
    let date1 = hit1.dateSpan.range.start;
    let delta = diffDates(date0, date1, dateEnv, hit0.largeUnit);
    if (isFromStart) {
        if (dateEnv.add(instanceRange.start, delta) < instanceRange.end) {
            return { startDelta: delta };
        }
    }
    else if (dateEnv.add(instanceRange.end, delta) > instanceRange.start) {
        return { endDelta: delta };
    }
    return null;
}

class UnselectAuto {
    constructor(context) {
        this.context = context;
        this.isRecentPointerDateSelect = false; // wish we could use a selector to detect date selection, but uses hit system
        this.matchesCancel = false;
        this.matchesEvent = false;
        this.onSelect = (selectInfo) => {
            if (selectInfo.jsEvent) {
                this.isRecentPointerDateSelect = true;
            }
        };
        this.onDocumentPointerDown = (pev) => {
            let unselectCancel = this.context.options.unselectCancel;
            let downEl = getEventTargetViaRoot(pev.origEvent);
            this.matchesCancel = !!elementClosest(downEl, unselectCancel);
            this.matchesEvent = !!elementClosest(downEl, EventDragging.SELECTOR); // interaction started on an event?
        };
        this.onDocumentPointerUp = (pev) => {
            let { context } = this;
            let { documentPointer } = this;
            let calendarState = context.getCurrentData();
            // touch-scrolling should never unfocus any type of selection
            if (!documentPointer.wasTouchScroll) {
                if (calendarState.dateSelection && // an existing date selection?
                    !this.isRecentPointerDateSelect // a new pointer-initiated date selection since last onDocumentPointerUp?
                ) {
                    let unselectAuto = context.options.unselectAuto;
                    if (unselectAuto && (!unselectAuto || !this.matchesCancel)) {
                        context.calendarApi.unselect(pev);
                    }
                }
                if (calendarState.eventSelection && // an existing event selected?
                    !this.matchesEvent // interaction DIDN'T start on an event
                ) {
                    context.dispatch({ type: 'UNSELECT_EVENT' });
                }
            }
            this.isRecentPointerDateSelect = false;
        };
        let documentPointer = this.documentPointer = new PointerDragging(document);
        documentPointer.shouldIgnoreMove = true;
        documentPointer.shouldWatchScroll = false;
        documentPointer.emitter.on('pointerdown', this.onDocumentPointerDown);
        documentPointer.emitter.on('pointerup', this.onDocumentPointerUp);
        /*
        TODO: better way to know about whether there was a selection with the pointer
        */
        context.emitter.on('select', this.onSelect);
    }
    destroy() {
        this.context.emitter.off('select', this.onSelect);
        this.documentPointer.destroy();
    }
}

const OPTION_REFINERS = {
    fixedMirrorParent: identity,
};
const LISTENER_REFINERS = {
    dateClick: identity,
    eventDragStart: identity,
    eventDragStop: identity,
    eventDrop: identity,
    eventResizeStart: identity,
    eventResizeStop: identity,
    eventResize: identity,
    drop: identity,
    eventReceive: identity,
    eventLeave: identity,
};

/*
Given an already instantiated draggable object for one-or-more elements,
Interprets any dragging as an attempt to drag an events that lives outside
of a calendar onto a calendar.
*/
class ExternalElementDragging {
    constructor(dragging, suppliedDragMeta) {
        this.receivingContext = null;
        this.droppableEvent = null; // will exist for all drags, even if create:false
        this.suppliedDragMeta = null;
        this.dragMeta = null;
        this.handleDragStart = (ev) => {
            this.dragMeta = this.buildDragMeta(ev.subjectEl);
        };
        this.handleHitUpdate = (hit, isFinal, ev) => {
            let { dragging } = this.hitDragging;
            let receivingContext = null;
            let droppableEvent = null;
            let isInvalid = false;
            let interaction = {
                affectedEvents: createEmptyEventStore(),
                mutatedEvents: createEmptyEventStore(),
                isEvent: this.dragMeta.create,
            };
            if (hit) {
                receivingContext = hit.context;
                if (this.canDropElOnCalendar(ev.subjectEl, receivingContext)) {
                    droppableEvent = computeEventForDateSpan(hit.dateSpan, this.dragMeta, receivingContext);
                    interaction.mutatedEvents = eventTupleToStore(droppableEvent);
                    isInvalid = !isInteractionValid(interaction, hit.dateProfile, receivingContext);
                    if (isInvalid) {
                        interaction.mutatedEvents = createEmptyEventStore();
                        droppableEvent = null;
                    }
                }
            }
            this.displayDrag(receivingContext, interaction);
            // show mirror if no already-rendered mirror element OR if we are shutting down the mirror (?)
            // TODO: wish we could somehow wait for dispatch to guarantee render
            dragging.setMirrorIsVisible(isFinal || !droppableEvent || !document.querySelector('.fc-event-mirror'));
            if (!isInvalid) {
                enableCursor();
            }
            else {
                disableCursor();
            }
            if (!isFinal) {
                dragging.setMirrorNeedsRevert(!droppableEvent);
                this.receivingContext = receivingContext;
                this.droppableEvent = droppableEvent;
            }
        };
        this.handleDragEnd = (pev) => {
            let { receivingContext, droppableEvent } = this;
            this.clearDrag();
            if (receivingContext && droppableEvent) {
                let finalHit = this.hitDragging.finalHit;
                let finalView = finalHit.context.viewApi;
                let dragMeta = this.dragMeta;
                receivingContext.emitter.trigger('drop', Object.assign(Object.assign({}, buildDatePointApiWithContext(finalHit.dateSpan, receivingContext)), { draggedEl: pev.subjectEl, jsEvent: pev.origEvent, view: finalView }));
                if (dragMeta.create) {
                    let addingEvents = eventTupleToStore(droppableEvent);
                    receivingContext.dispatch({
                        type: 'MERGE_EVENTS',
                        eventStore: addingEvents,
                    });
                    if (pev.isTouch) {
                        receivingContext.dispatch({
                            type: 'SELECT_EVENT',
                            eventInstanceId: droppableEvent.instance.instanceId,
                        });
                    }
                    // signal that an external event landed
                    receivingContext.emitter.trigger('eventReceive', {
                        event: new EventImpl(receivingContext, droppableEvent.def, droppableEvent.instance),
                        relatedEvents: [],
                        revert() {
                            receivingContext.dispatch({
                                type: 'REMOVE_EVENTS',
                                eventStore: addingEvents,
                            });
                        },
                        draggedEl: pev.subjectEl,
                        view: finalView,
                    });
                }
            }
            this.receivingContext = null;
            this.droppableEvent = null;
        };
        let hitDragging = this.hitDragging = new HitDragging(dragging, interactionSettingsStore);
        hitDragging.requireInitial = false; // will start outside of a component
        hitDragging.emitter.on('dragstart', this.handleDragStart);
        hitDragging.emitter.on('hitupdate', this.handleHitUpdate);
        hitDragging.emitter.on('dragend', this.handleDragEnd);
        this.suppliedDragMeta = suppliedDragMeta;
    }
    buildDragMeta(subjectEl) {
        if (typeof this.suppliedDragMeta === 'object') {
            return parseDragMeta(this.suppliedDragMeta);
        }
        if (typeof this.suppliedDragMeta === 'function') {
            return parseDragMeta(this.suppliedDragMeta(subjectEl));
        }
        return getDragMetaFromEl(subjectEl);
    }
    displayDrag(nextContext, state) {
        let prevContext = this.receivingContext;
        if (prevContext && prevContext !== nextContext) {
            prevContext.dispatch({ type: 'UNSET_EVENT_DRAG' });
        }
        if (nextContext) {
            nextContext.dispatch({ type: 'SET_EVENT_DRAG', state });
        }
    }
    clearDrag() {
        if (this.receivingContext) {
            this.receivingContext.dispatch({ type: 'UNSET_EVENT_DRAG' });
        }
    }
    canDropElOnCalendar(el, receivingContext) {
        let dropAccept = receivingContext.options.dropAccept;
        if (typeof dropAccept === 'function') {
            return dropAccept.call(receivingContext.calendarApi, el);
        }
        if (typeof dropAccept === 'string' && dropAccept) {
            return Boolean(elementMatches(el, dropAccept));
        }
        return true;
    }
}
// Utils for computing event store from the DragMeta
// ----------------------------------------------------------------------------------------------------
function computeEventForDateSpan(dateSpan, dragMeta, context) {
    let defProps = Object.assign({}, dragMeta.leftoverProps);
    for (let transform of context.pluginHooks.externalDefTransforms) {
        Object.assign(defProps, transform(dateSpan, dragMeta));
    }
    let { refined, extra } = refineEventDef(defProps, context);
    let def = parseEventDef(refined, extra, dragMeta.sourceId, dateSpan.allDay, context.options.forceEventDuration || Boolean(dragMeta.duration), // hasEnd
    context);
    let start = dateSpan.range.start;
    // only rely on time info if drop zone is all-day,
    // otherwise, we already know the time
    if (dateSpan.allDay && dragMeta.startTime) {
        start = context.dateEnv.add(start, dragMeta.startTime);
    }
    let end = dragMeta.duration ?
        context.dateEnv.add(start, dragMeta.duration) :
        getDefaultEventEnd(dateSpan.allDay, start, context);
    let instance = createEventInstance(def.defId, { start, end });
    return { def, instance };
}
// Utils for extracting data from element
// ----------------------------------------------------------------------------------------------------
function getDragMetaFromEl(el) {
    let str = getEmbeddedElData(el, 'event');
    let obj = str ?
        JSON.parse(str) :
        { create: false }; // if no embedded data, assume no event creation
    return parseDragMeta(obj);
}
config.dataAttrPrefix = '';
function getEmbeddedElData(el, name) {
    let prefix = config.dataAttrPrefix;
    let prefixedName = (prefix ? prefix + '-' : '') + name;
    return el.getAttribute('data-' + prefixedName) || '';
}

/*
Makes an element (that is *external* to any calendar) draggable.
Can pass in data that determines how an event will be created when dropped onto a calendar.
Leverages FullCalendar's internal drag-n-drop functionality WITHOUT a third-party drag system.
*/
class ExternalDraggable {
    constructor(el, settings = {}) {
        this.handlePointerDown = (ev) => {
            let { dragging } = this;
            let { minDistance, longPressDelay } = this.settings;
            dragging.minDistance =
                minDistance != null ?
                    minDistance :
                    (ev.isTouch ? 0 : BASE_OPTION_DEFAULTS.eventDragMinDistance);
            dragging.delay =
                ev.isTouch ? // TODO: eventually read eventLongPressDelay instead vvv
                    (longPressDelay != null ? longPressDelay : BASE_OPTION_DEFAULTS.longPressDelay) :
                    0;
        };
        this.handleDragStart = (ev) => {
            if (ev.isTouch &&
                this.dragging.delay &&
                ev.subjectEl.classList.contains('fc-event')) {
                this.dragging.mirror.getMirrorEl().classList.add('fc-event-selected');
            }
        };
        this.settings = settings;
        let dragging = this.dragging = new FeaturefulElementDragging(el);
        dragging.touchScrollAllowed = false;
        if (settings.itemSelector != null) {
            dragging.pointer.selector = settings.itemSelector;
        }
        if (settings.appendTo != null) {
            dragging.mirror.parentNode = settings.appendTo; // TODO: write tests
        }
        dragging.emitter.on('pointerdown', this.handlePointerDown);
        dragging.emitter.on('dragstart', this.handleDragStart);
        new ExternalElementDragging(dragging, settings.eventData); // eslint-disable-line no-new
    }
    destroy() {
        this.dragging.destroy();
    }
}

/*
Detects when a *THIRD-PARTY* drag-n-drop system interacts with elements.
The third-party system is responsible for drawing the visuals effects of the drag.
This class simply monitors for pointer movements and fires events.
It also has the ability to hide the moving element (the "mirror") during the drag.
*/
class InferredElementDragging extends ElementDragging {
    constructor(containerEl) {
        super(containerEl);
        this.shouldIgnoreMove = false;
        this.mirrorSelector = '';
        this.currentMirrorEl = null;
        this.handlePointerDown = (ev) => {
            this.emitter.trigger('pointerdown', ev);
            if (!this.shouldIgnoreMove) {
                // fire dragstart right away. does not support delay or min-distance
                this.emitter.trigger('dragstart', ev);
            }
        };
        this.handlePointerMove = (ev) => {
            if (!this.shouldIgnoreMove) {
                this.emitter.trigger('dragmove', ev);
            }
        };
        this.handlePointerUp = (ev) => {
            this.emitter.trigger('pointerup', ev);
            if (!this.shouldIgnoreMove) {
                // fire dragend right away. does not support a revert animation
                this.emitter.trigger('dragend', ev);
            }
        };
        let pointer = this.pointer = new PointerDragging(containerEl);
        pointer.emitter.on('pointerdown', this.handlePointerDown);
        pointer.emitter.on('pointermove', this.handlePointerMove);
        pointer.emitter.on('pointerup', this.handlePointerUp);
    }
    destroy() {
        this.pointer.destroy();
    }
    setIgnoreMove(bool) {
        this.shouldIgnoreMove = bool;
    }
    setMirrorIsVisible(bool) {
        if (bool) {
            // restore a previously hidden element.
            // use the reference in case the selector class has already been removed.
            if (this.currentMirrorEl) {
                this.currentMirrorEl.style.visibility = '';
                this.currentMirrorEl = null;
            }
        }
        else {
            let mirrorEl = this.mirrorSelector
                // TODO: somehow query FullCalendars WITHIN shadow-roots
                ? document.querySelector(this.mirrorSelector)
                : null;
            if (mirrorEl) {
                this.currentMirrorEl = mirrorEl;
                mirrorEl.style.visibility = 'hidden';
            }
        }
    }
}

/*
Bridges third-party drag-n-drop systems with FullCalendar.
Must be instantiated and destroyed by caller.
*/
class ThirdPartyDraggable {
    constructor(containerOrSettings, settings) {
        let containerEl = document;
        if (
        // wish we could just test instanceof EventTarget, but doesn't work in IE11
        containerOrSettings === document ||
            containerOrSettings instanceof Element) {
            containerEl = containerOrSettings;
            settings = settings || {};
        }
        else {
            settings = (containerOrSettings || {});
        }
        let dragging = this.dragging = new InferredElementDragging(containerEl);
        if (typeof settings.itemSelector === 'string') {
            dragging.pointer.selector = settings.itemSelector;
        }
        else if (containerEl === document) {
            dragging.pointer.selector = '[data-event]';
        }
        if (typeof settings.mirrorSelector === 'string') {
            dragging.mirrorSelector = settings.mirrorSelector;
        }
        let externalDragging = new ExternalElementDragging(dragging, settings.eventData);
        // The hit-detection system requires that the dnd-mirror-element be pointer-events:none,
        // but this can't be guaranteed for third-party draggables, so disable
        externalDragging.hitDragging.disablePointCheck = true;
    }
    destroy() {
        this.dragging.destroy();
    }
}

var index = createPlugin({
    name: '@fullcalendar/interaction',
    componentInteractions: [DateClicking, DateSelecting, EventDragging, EventResizing],
    calendarInteractions: [UnselectAuto],
    elementDraggingImpl: FeaturefulElementDragging,
    optionRefiners: OPTION_REFINERS,
    listenerRefiners: LISTENER_REFINERS,
});

export { ExternalDraggable as Draggable, ThirdPartyDraggable, index as default };