/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('@angular/core'), require('@angular/common'), require('@angular/cdk/platform'), require('rxjs'), require('@angular/cdk/coercion'), require('@angular/cdk/bidi'), require('@angular/cdk/scrolling'), require('rxjs/operators')) :
	typeof define === 'function' && define.amd ? define('@angular/cdk/dragDrop', ['exports', '@angular/core', '@angular/common', '@angular/cdk/platform', 'rxjs', '@angular/cdk/coercion', '@angular/cdk/bidi', '@angular/cdk/scrolling', 'rxjs/operators'], factory) :
	(factory((global.ng = global.ng || {}, global.ng.cdk = global.ng.cdk || {}, global.ng.cdk.dragDrop = {}),global.ng.core,global.ng.common,global.ng.cdk.platform,global.rxjs,global.ng.cdk.coercion,global.ng.cdk.bidi,global.ng.cdk.scrolling,global.rxjs.operators));
}(this, (function (exports,core,common,platform,rxjs,coercion,bidi,scrolling,operators) { 'use strict';

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Injection token that is used to provide a CdkDropList instance to CdkDrag.
 * Used for avoiding circular imports.
 * @type {?}
 */
var CDK_DROP_LIST = new core.InjectionToken('CDK_DROP_LIST');
/**
 * Injection token that is used to provide a CdkDropList instance to CdkDrag.
 * Used for avoiding circular imports.
 * @deprecated Use `CDK_DROP_LIST` instead.
 * \@breaking-change 8.0.0
 * @type {?}
 */
var CDK_DROP_LIST_CONTAINER = CDK_DROP_LIST;

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */

/**
 * Moves an item one index in an array to another.
 * @template T
 * @param {?} array Array in which to move the item.
 * @param {?} fromIndex Starting index of the item.
 * @param {?} toIndex Index to which the item should be moved.
 * @return {?}
 */
function moveItemInArray(array, fromIndex, toIndex) {
    /** @type {?} */
    var from = clamp(fromIndex, array.length - 1);
    /** @type {?} */
    var to = clamp(toIndex, array.length - 1);
    if (from === to) {
        return;
    }
    /** @type {?} */
    var target = array[from];
    /** @type {?} */
    var delta = to < from ? -1 : 1;
    for (var i = from; i !== to; i += delta) {
        array[i] = array[i + delta];
    }
    array[to] = target;
}
/**
 * Moves an item from one array to another.
 * @template T
 * @param {?} currentArray Array from which to transfer the item.
 * @param {?} targetArray Array into which to put the item.
 * @param {?} currentIndex Index of the item in its current array.
 * @param {?} targetIndex Index at which to insert the item.
 * @return {?}
 */
function transferArrayItem(currentArray, targetArray, currentIndex, targetIndex) {
    /** @type {?} */
    var from = clamp(currentIndex, currentArray.length - 1);
    /** @type {?} */
    var to = clamp(targetIndex, targetArray.length);
    if (currentArray.length) {
        targetArray.splice(to, 0, currentArray.splice(from, 1)[0]);
    }
}
/**
 * Copies an item from one array to another, leaving it in its
 * original position in current array.
 * @template T
 * @param {?} currentArray Array from which to copy the item.
 * @param {?} targetArray Array into which is copy the item.
 * @param {?} currentIndex Index of the item in its current array.
 * @param {?} targetIndex Index at which to insert the item.
 *
 * @return {?}
 */
function copyArrayItem(currentArray, targetArray, currentIndex, targetIndex) {
    /** @type {?} */
    var to = clamp(targetIndex, targetArray.length);
    if (currentArray.length) {
        targetArray.splice(to, 0, currentArray[currentIndex]);
    }
}
/**
 * Clamps a number between zero and a maximum.
 * @param {?} value
 * @param {?} max
 * @return {?}
 */
function clamp(value, max) {
    return Math.max(0, Math.min(max, value));
}

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Event options that can be used to bind an active, capturing event.
 * @type {?}
 */
var activeCapturingEventOptions = platform.normalizePassiveListenerOptions({
    passive: false,
    capture: true
});
/**
 * Service that keeps track of all the drag item and drop container
 * instances, and manages global event listeners on the `document`.
 * \@docs-private
 * @template I, C
 */
// Note: this class is generic, rather than referencing CdkDrag and CdkDropList directly, in order
// to avoid circular imports. If we were to reference them here, importing the registry into the
// classes that are registering themselves will introduce a circular import.
var DragDropRegistry = /** @class */ (function () {
    function DragDropRegistry(_ngZone, _document) {
        var _this = this;
        this._ngZone = _ngZone;
        /**
         * Registered drop container instances.
         */
        this._dropInstances = new Set();
        /**
         * Registered drag item instances.
         */
        this._dragInstances = new Set();
        /**
         * Drag item instances that are currently being dragged.
         */
        this._activeDragInstances = new Set();
        /**
         * Keeps track of the event listeners that we've bound to the `document`.
         */
        this._globalListeners = new Map();
        /**
         * Emits the `touchmove` or `mousemove` events that are dispatched
         * while the user is dragging a drag item instance.
         */
        this.pointerMove = new rxjs.Subject();
        /**
         * Emits the `touchend` or `mouseup` events that are dispatched
         * while the user is dragging a drag item instance.
         */
        this.pointerUp = new rxjs.Subject();
        /**
         * Event listener that will prevent the default browser action while the user is dragging.
         * @param event Event whose default action should be prevented.
         */
        this._preventDefaultWhileDragging = function (event) {
            if (_this._activeDragInstances.size) {
                event.preventDefault();
            }
        };
        this._document = _document;
    }
    /** Adds a drop container to the registry. */
    /**
     * Adds a drop container to the registry.
     * @param {?} drop
     * @return {?}
     */
    DragDropRegistry.prototype.registerDropContainer = /**
     * Adds a drop container to the registry.
     * @param {?} drop
     * @return {?}
     */
    function (drop) {
        if (!this._dropInstances.has(drop)) {
            if (this.getDropContainer(drop.id)) {
                throw Error("Drop instance with id \"" + drop.id + "\" has already been registered.");
            }
            this._dropInstances.add(drop);
        }
    };
    /** Adds a drag item instance to the registry. */
    /**
     * Adds a drag item instance to the registry.
     * @param {?} drag
     * @return {?}
     */
    DragDropRegistry.prototype.registerDragItem = /**
     * Adds a drag item instance to the registry.
     * @param {?} drag
     * @return {?}
     */
    function (drag) {
        var _this = this;
        this._dragInstances.add(drag);
        // The `touchmove` event gets bound once, ahead of time, because WebKit
        // won't preventDefault on a dynamically-added `touchmove` listener.
        // See https://bugs.webkit.org/show_bug.cgi?id=184250.
        if (this._dragInstances.size === 1) {
            this._ngZone.runOutsideAngular(function () {
                // The event handler has to be explicitly active,
                // because newer browsers make it passive by default.
                _this._document.addEventListener('touchmove', _this._preventDefaultWhileDragging, activeCapturingEventOptions);
            });
        }
    };
    /** Removes a drop container from the registry. */
    /**
     * Removes a drop container from the registry.
     * @param {?} drop
     * @return {?}
     */
    DragDropRegistry.prototype.removeDropContainer = /**
     * Removes a drop container from the registry.
     * @param {?} drop
     * @return {?}
     */
    function (drop) {
        this._dropInstances.delete(drop);
    };
    /** Removes a drag item instance from the registry. */
    /**
     * Removes a drag item instance from the registry.
     * @param {?} drag
     * @return {?}
     */
    DragDropRegistry.prototype.removeDragItem = /**
     * Removes a drag item instance from the registry.
     * @param {?} drag
     * @return {?}
     */
    function (drag) {
        this._dragInstances.delete(drag);
        this.stopDragging(drag);
        if (this._dragInstances.size === 0) {
            this._document.removeEventListener('touchmove', this._preventDefaultWhileDragging, activeCapturingEventOptions);
        }
    };
    /**
     * Starts the dragging sequence for a drag instance.
     * @param drag Drag instance which is being dragged.
     * @param event Event that initiated the dragging.
     */
    /**
     * Starts the dragging sequence for a drag instance.
     * @param {?} drag Drag instance which is being dragged.
     * @param {?} event Event that initiated the dragging.
     * @return {?}
     */
    DragDropRegistry.prototype.startDragging = /**
     * Starts the dragging sequence for a drag instance.
     * @param {?} drag Drag instance which is being dragged.
     * @param {?} event Event that initiated the dragging.
     * @return {?}
     */
    function (drag, event) {
        var _this = this;
        this._activeDragInstances.add(drag);
        if (this._activeDragInstances.size === 1) {
            /** @type {?} */
            var isTouchEvent = event.type.startsWith('touch');
            /** @type {?} */
            var moveEvent = isTouchEvent ? 'touchmove' : 'mousemove';
            /** @type {?} */
            var upEvent = isTouchEvent ? 'touchend' : 'mouseup';
            // We explicitly bind __active__ listeners here, because newer browsers will default to
            // passive ones for `mousemove` and `touchmove`. The events need to be active, because we
            // use `preventDefault` to prevent the page from scrolling while the user is dragging.
            this._globalListeners
                .set(moveEvent, {
                handler: function (e) { return _this.pointerMove.next((/** @type {?} */ (e))); },
                options: activeCapturingEventOptions
            })
                .set(upEvent, {
                handler: function (e) { return _this.pointerUp.next((/** @type {?} */ (e))); },
                options: true
            })
                // Preventing the default action on `mousemove` isn't enough to disable text selection
                // on Safari so we need to prevent the selection event as well. Alternatively this can
                // be done by setting `user-select: none` on the `body`, however it has causes a style
                // recalculation which can be expensive on pages with a lot of elements.
                .set('selectstart', {
                handler: this._preventDefaultWhileDragging,
                options: activeCapturingEventOptions
            });
            // TODO(crisbeto): prevent mouse wheel scrolling while
            // dragging until we've set up proper scroll handling.
            if (!isTouchEvent) {
                this._globalListeners.set('wheel', {
                    handler: this._preventDefaultWhileDragging,
                    options: activeCapturingEventOptions
                });
            }
            this._ngZone.runOutsideAngular(function () {
                _this._globalListeners.forEach(function (config, name) {
                    _this._document.addEventListener(name, config.handler, config.options);
                });
            });
        }
    };
    /** Stops dragging a drag item instance. */
    /**
     * Stops dragging a drag item instance.
     * @param {?} drag
     * @return {?}
     */
    DragDropRegistry.prototype.stopDragging = /**
     * Stops dragging a drag item instance.
     * @param {?} drag
     * @return {?}
     */
    function (drag) {
        this._activeDragInstances.delete(drag);
        if (this._activeDragInstances.size === 0) {
            this._clearGlobalListeners();
        }
    };
    /** Gets whether a drag item instance is currently being dragged. */
    /**
     * Gets whether a drag item instance is currently being dragged.
     * @param {?} drag
     * @return {?}
     */
    DragDropRegistry.prototype.isDragging = /**
     * Gets whether a drag item instance is currently being dragged.
     * @param {?} drag
     * @return {?}
     */
    function (drag) {
        return this._activeDragInstances.has(drag);
    };
    /**
     * Gets a drop container by its id.
     * @deprecated No longer being used. To be removed.
     * @breaking-change 8.0.0
     */
    /**
     * Gets a drop container by its id.
     * @deprecated No longer being used. To be removed.
     * \@breaking-change 8.0.0
     * @param {?} id
     * @return {?}
     */
    DragDropRegistry.prototype.getDropContainer = /**
     * Gets a drop container by its id.
     * @deprecated No longer being used. To be removed.
     * \@breaking-change 8.0.0
     * @param {?} id
     * @return {?}
     */
    function (id) {
        return Array.from(this._dropInstances).find(function (instance) { return instance.id === id; });
    };
    /**
     * @return {?}
     */
    DragDropRegistry.prototype.ngOnDestroy = /**
     * @return {?}
     */
    function () {
        var _this = this;
        this._dragInstances.forEach(function (instance) { return _this.removeDragItem(instance); });
        this._dropInstances.forEach(function (instance) { return _this.removeDropContainer(instance); });
        this._clearGlobalListeners();
        this.pointerMove.complete();
        this.pointerUp.complete();
    };
    /** Clears out the global event listeners from the `document`. */
    /**
     * Clears out the global event listeners from the `document`.
     * @private
     * @return {?}
     */
    DragDropRegistry.prototype._clearGlobalListeners = /**
     * Clears out the global event listeners from the `document`.
     * @private
     * @return {?}
     */
    function () {
        var _this = this;
        this._globalListeners.forEach(function (config, name) {
            _this._document.removeEventListener(name, config.handler, config.options);
        });
        this._globalListeners.clear();
    };
    DragDropRegistry.decorators = [
        { type: core.Injectable, args: [{ providedIn: 'root' },] },
    ];
    /** @nocollapse */
    DragDropRegistry.ctorParameters = function () { return [
        { type: core.NgZone },
        { type: undefined, decorators: [{ type: core.Inject, args: [common.DOCUMENT,] }] }
    ]; };
    /** @nocollapse */ DragDropRegistry.ngInjectableDef = core.defineInjectable({ factory: function DragDropRegistry_Factory() { return new DragDropRegistry(core.inject(core.NgZone), core.inject(common.DOCUMENT)); }, token: DragDropRegistry, providedIn: "root" });
    return DragDropRegistry;
}());

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Injection token that can be used for a `CdkDrag` to provide itself as a parent to the
 * drag-specific child directive (`CdkDragHandle`, `CdkDragPreview` etc.). Used primarily
 * to avoid circular imports.
 * \@docs-private
 * @type {?}
 */
var CDK_DRAG_PARENT = new core.InjectionToken('CDK_DRAG_PARENT');

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Shallow-extends a stylesheet object with another stylesheet object.
 * \@docs-private
 * @param {?} dest
 * @param {?} source
 * @return {?}
 */
function extendStyles(dest, source) {
    for (var key in source) {
        if (source.hasOwnProperty(key)) {
            dest[(/** @type {?} */ (key))] = source[(/** @type {?} */ (key))];
        }
    }
    return dest;
}
/**
 * Toggles whether the native drag interactions should be enabled for an element.
 * \@docs-private
 * @param {?} element Element on which to toggle the drag interactions.
 * @param {?} enable Whether the drag interactions should be enabled.
 * @return {?}
 */
function toggleNativeDragInteractions(element, enable) {
    /** @type {?} */
    var userSelect = enable ? '' : 'none';
    extendStyles(element.style, {
        touchAction: enable ? '' : 'none',
        webkitUserDrag: enable ? '' : 'none',
        webkitTapHighlightColor: enable ? '' : 'transparent',
        userSelect: userSelect,
        msUserSelect: userSelect,
        webkitUserSelect: userSelect,
        MozUserSelect: userSelect
    });
}

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Handle that can be used to drag and CdkDrag instance.
 */
var CdkDragHandle = /** @class */ (function () {
    function CdkDragHandle(element, parentDrag) {
        this.element = element;
        this._disabled = false;
        this._parentDrag = parentDrag;
        toggleNativeDragInteractions(element.nativeElement, false);
    }
    Object.defineProperty(CdkDragHandle.prototype, "disabled", {
        /** Whether starting to drag through this handle is disabled. */
        get: /**
         * Whether starting to drag through this handle is disabled.
         * @return {?}
         */
        function () { return this._disabled; },
        set: /**
         * @param {?} value
         * @return {?}
         */
        function (value) {
            this._disabled = coercion.coerceBooleanProperty(value);
        },
        enumerable: true,
        configurable: true
    });
    CdkDragHandle.decorators = [
        { type: core.Directive, args: [{
                    selector: '[cdkDragHandle]',
                    host: {
                        'class': 'cdk-drag-handle'
                    }
                },] },
    ];
    /** @nocollapse */
    CdkDragHandle.ctorParameters = function () { return [
        { type: core.ElementRef },
        { type: undefined, decorators: [{ type: core.Inject, args: [CDK_DRAG_PARENT,] }, { type: core.Optional }] }
    ]; };
    CdkDragHandle.propDecorators = {
        disabled: [{ type: core.Input, args: ['cdkDragHandleDisabled',] }]
    };
    return CdkDragHandle;
}());

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Element that will be used as a template for the placeholder of a CdkDrag when
 * it is being dragged. The placeholder is displayed in place of the element being dragged.
 * @template T
 */
var CdkDragPlaceholder = /** @class */ (function () {
    function CdkDragPlaceholder(templateRef) {
        this.templateRef = templateRef;
    }
    CdkDragPlaceholder.decorators = [
        { type: core.Directive, args: [{
                    selector: 'ng-template[cdkDragPlaceholder]'
                },] },
    ];
    /** @nocollapse */
    CdkDragPlaceholder.ctorParameters = function () { return [
        { type: core.TemplateRef }
    ]; };
    CdkDragPlaceholder.propDecorators = {
        data: [{ type: core.Input }]
    };
    return CdkDragPlaceholder;
}());

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Element that will be used as a template for the preview
 * of a CdkDrag when it is being dragged.
 * @template T
 */
var CdkDragPreview = /** @class */ (function () {
    function CdkDragPreview(templateRef) {
        this.templateRef = templateRef;
    }
    CdkDragPreview.decorators = [
        { type: core.Directive, args: [{
                    selector: 'ng-template[cdkDragPreview]'
                },] },
    ];
    /** @nocollapse */
    CdkDragPreview.ctorParameters = function () { return [
        { type: core.TemplateRef }
    ]; };
    CdkDragPreview.propDecorators = {
        data: [{ type: core.Input }]
    };
    return CdkDragPreview;
}());

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */

/**
 * Parses a CSS time value to milliseconds.
 * @param {?} value
 * @return {?}
 */
function parseCssTimeUnitsToMs(value) {
    // Some browsers will return it in seconds, whereas others will return milliseconds.
    /** @type {?} */
    var multiplier = value.toLowerCase().indexOf('ms') > -1 ? 1 : 1000;
    return parseFloat(value) * multiplier;
}
/**
 * Gets the transform transition duration, including the delay, of an element in milliseconds.
 * @param {?} element
 * @return {?}
 */
function getTransformTransitionDurationInMs(element) {
    /** @type {?} */
    var computedStyle = getComputedStyle(element);
    /** @type {?} */
    var transitionedProperties = parseCssPropertyValue(computedStyle, 'transition-property');
    /** @type {?} */
    var property = transitionedProperties.find(function (prop) { return prop === 'transform' || prop === 'all'; });
    // If there's no transition for `all` or `transform`, we shouldn't do anything.
    if (!property) {
        return 0;
    }
    // Get the index of the property that we're interested in and match
    // it up to the same index in `transition-delay` and `transition-duration`.
    /** @type {?} */
    var propertyIndex = transitionedProperties.indexOf(property);
    /** @type {?} */
    var rawDurations = parseCssPropertyValue(computedStyle, 'transition-duration');
    /** @type {?} */
    var rawDelays = parseCssPropertyValue(computedStyle, 'transition-delay');
    return parseCssTimeUnitsToMs(rawDurations[propertyIndex]) +
        parseCssTimeUnitsToMs(rawDelays[propertyIndex]);
}
/**
 * Parses out multiple values from a computed style into an array.
 * @param {?} computedStyle
 * @param {?} name
 * @return {?}
 */
function parseCssPropertyValue(computedStyle, name) {
    /** @type {?} */
    var value = computedStyle.getPropertyValue(name);
    return value.split(',').map(function (part) { return part.trim(); });
}

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Options that can be used to bind a passive event listener.
 * @type {?}
 */
var passiveEventListenerOptions = platform.normalizePassiveListenerOptions({ passive: true });
/**
 * Options that can be used to bind an active event listener.
 * @type {?}
 */
var activeEventListenerOptions = platform.normalizePassiveListenerOptions({ passive: false });
/**
 * Time in milliseconds for which to ignore mouse events, after
 * receiving a touch event. Used to avoid doing double work for
 * touch devices where the browser fires fake mouse events, in
 * addition to touch events.
 * @type {?}
 */
var MOUSE_EVENT_IGNORE_TIME = 800;
/**
 * Reference to a draggable item. Used to manipulate or dispose of the item.
 * \@docs-private
 * @template T
 */
var /**
 * Reference to a draggable item. Used to manipulate or dispose of the item.
 * \@docs-private
 * @template T
 */
DragRef = /** @class */ (function () {
    function DragRef(element, _document, _ngZone, _viewContainerRef, _viewportRuler, _dragDropRegistry, _config, dropContainer, _dir) {
        var _this = this;
        this._document = _document;
        this._ngZone = _ngZone;
        this._viewContainerRef = _viewContainerRef;
        this._viewportRuler = _viewportRuler;
        this._dragDropRegistry = _dragDropRegistry;
        this._config = _config;
        this.dropContainer = dropContainer;
        this._dir = _dir;
        /**
         * CSS `transform` applied to the element when it isn't being dragged. We need a
         * passive transform in order for the dragged element to retain its new position
         * after the user has stopped dragging and because we need to know the relative
         * position in case they start dragging again. This corresponds to `element.style.transform`.
         */
        this._passiveTransform = { x: 0, y: 0 };
        /**
         * CSS `transform` that is applied to the element while it's being dragged.
         */
        this._activeTransform = { x: 0, y: 0 };
        /**
         * Emits when the item is being moved.
         */
        this._moveEvents = new rxjs.Subject();
        /**
         * Amount of subscriptions to the move event. Used to avoid
         * hitting the zone if the consumer didn't subscribe to it.
         */
        this._moveEventSubscriptions = 0;
        /**
         * Subscription to pointer movement events.
         */
        this._pointerMoveSubscription = rxjs.Subscription.EMPTY;
        /**
         * Subscription to the event that is dispatched when the user lifts their pointer.
         */
        this._pointerUpSubscription = rxjs.Subscription.EMPTY;
        /**
         * Cached reference to the boundary element.
         */
        this._boundaryElement = null;
        /**
         * Elements that can be used to drag the draggable item.
         */
        this._handles = [];
        /**
         * Whether the native interactions on the element are enabled.
         */
        this._nativeInteractionsEnabled = true;
        this._disabled = false;
        /**
         * Emits as the drag sequence is being prepared.
         */
        this.beforeStarted = new rxjs.Subject();
        /**
         * Emits when the user starts dragging the item.
         */
        this.started = new rxjs.Subject();
        /**
         * Emits when the user has released a drag item, before any animations have started.
         */
        this.released = new rxjs.Subject();
        /**
         * Emits when the user stops dragging an item in the container.
         */
        this.ended = new rxjs.Subject();
        /**
         * Emits when the user has moved the item into a new container.
         */
        this.entered = new rxjs.Subject();
        /**
         * Emits when the user removes the item its container by dragging it into another container.
         */
        this.exited = new rxjs.Subject();
        /**
         * Emits when the user drops the item inside a container.
         */
        this.dropped = new rxjs.Subject();
        /**
         * Emits as the user is dragging the item. Use with caution,
         * because this event will fire for every pixel that the user has dragged.
         */
        this.moved = rxjs.Observable.create(function (observer) {
            /** @type {?} */
            var subscription = _this._moveEvents.subscribe(observer);
            _this._moveEventSubscriptions++;
            return function () {
                subscription.unsubscribe();
                _this._moveEventSubscriptions--;
            };
        });
        /**
         * Handler for the `mousedown`/`touchstart` events.
         */
        this._pointerDown = function (event) {
            _this.beforeStarted.next();
            // Delegate the event based on whether it started from a handle or the element itself.
            if (_this._handles.length) {
                /** @type {?} */
                var targetHandle = _this._handles.find(function (handle) {
                    /** @type {?} */
                    var element = handle.element.nativeElement;
                    /** @type {?} */
                    var target = event.target;
                    return !!target && (target === element || element.contains((/** @type {?} */ (target))));
                });
                if (targetHandle && !targetHandle.disabled && !_this.disabled) {
                    _this._initializeDragSequence(targetHandle.element.nativeElement, event);
                }
            }
            else if (!_this.disabled) {
                _this._initializeDragSequence(_this._rootElement, event);
            }
        };
        /**
         * Handler that is invoked when the user moves their pointer after they've initiated a drag.
         */
        this._pointerMove = function (event) {
            if (!_this._hasStartedDragging) {
                /** @type {?} */
                var pointerPosition = _this._getPointerPositionOnPage(event);
                /** @type {?} */
                var distanceX = Math.abs(pointerPosition.x - _this._pickupPositionOnPage.x);
                /** @type {?} */
                var distanceY = Math.abs(pointerPosition.y - _this._pickupPositionOnPage.y);
                // Only start dragging after the user has moved more than the minimum distance in either
                // direction. Note that this is preferrable over doing something like `skip(minimumDistance)`
                // in the `pointerMove` subscription, because we're not guaranteed to have one move event
                // per pixel of movement (e.g. if the user moves their pointer quickly).
                if (distanceX + distanceY >= _this._config.dragStartThreshold) {
                    _this._hasStartedDragging = true;
                    _this._ngZone.run(function () { return _this._startDragSequence(event); });
                }
                return;
            }
            // We only need the preview dimensions if we have a boundary element.
            if (_this._boundaryElement) {
                // Cache the preview element rect if we haven't cached it already or if
                // we cached it too early before the element dimensions were computed.
                if (!_this._previewRect || (!_this._previewRect.width && !_this._previewRect.height)) {
                    _this._previewRect = (_this._preview || _this._rootElement).getBoundingClientRect();
                }
            }
            /** @type {?} */
            var constrainedPointerPosition = _this._getConstrainedPointerPosition(event);
            _this._hasMoved = true;
            event.preventDefault();
            _this._updatePointerDirectionDelta(constrainedPointerPosition);
            if (_this.dropContainer) {
                _this._updateActiveDropContainer(constrainedPointerPosition);
            }
            else {
                /** @type {?} */
                var activeTransform = _this._activeTransform;
                activeTransform.x =
                    constrainedPointerPosition.x - _this._pickupPositionOnPage.x + _this._passiveTransform.x;
                activeTransform.y =
                    constrainedPointerPosition.y - _this._pickupPositionOnPage.y + _this._passiveTransform.y;
                /** @type {?} */
                var transform = getTransform(activeTransform.x, activeTransform.y);
                // Preserve the previous `transform` value, if there was one.
                _this._rootElement.style.transform = _this._initialTransform ?
                    _this._initialTransform + ' ' + transform : transform;
                // Apply transform as attribute if dragging and svg element to work for IE
                if (typeof SVGElement !== 'undefined' && _this._rootElement instanceof SVGElement) {
                    /** @type {?} */
                    var appliedTransform = "translate(" + activeTransform.x + " " + activeTransform.y + ")";
                    _this._rootElement.setAttribute('transform', appliedTransform);
                }
            }
            // Since this event gets fired for every pixel while dragging, we only
            // want to fire it if the consumer opted into it. Also we have to
            // re-enter the zone because we run all of the events on the outside.
            if (_this._moveEventSubscriptions > 0) {
                _this._ngZone.run(function () {
                    _this._moveEvents.next({
                        source: _this,
                        pointerPosition: constrainedPointerPosition,
                        event: event,
                        delta: _this._pointerDirectionDelta
                    });
                });
            }
        };
        /**
         * Handler that is invoked when the user lifts their pointer up, after initiating a drag.
         */
        this._pointerUp = function (event) {
            // Note that here we use `isDragging` from the service, rather than from `this`.
            // The difference is that the one from the service reflects whether a dragging sequence
            // has been initiated, whereas the one on `this` includes whether the user has passed
            // the minimum dragging threshold.
            if (!_this._dragDropRegistry.isDragging(_this)) {
                return;
            }
            _this._removeSubscriptions();
            _this._dragDropRegistry.stopDragging(_this);
            if (_this._handles) {
                _this._rootElement.style.webkitTapHighlightColor = _this._rootElementTapHighlight;
            }
            if (!_this._hasStartedDragging) {
                return;
            }
            _this.released.next({ source: _this });
            if (!_this.dropContainer) {
                // Convert the active transform into a passive one. This means that next time
                // the user starts dragging the item, its position will be calculated relatively
                // to the new passive transform.
                _this._passiveTransform.x = _this._activeTransform.x;
                _this._passiveTransform.y = _this._activeTransform.y;
                _this._ngZone.run(function () { return _this.ended.next({ source: _this }); });
                _this._dragDropRegistry.stopDragging(_this);
                return;
            }
            _this._animatePreviewToPlaceholder().then(function () {
                _this._cleanupDragArtifacts(event);
                _this._dragDropRegistry.stopDragging(_this);
            });
        };
        this.withRootElement(element);
        _dragDropRegistry.registerDragItem(this);
    }
    Object.defineProperty(DragRef.prototype, "disabled", {
        /** Whether starting to drag this element is disabled. */
        get: /**
         * Whether starting to drag this element is disabled.
         * @return {?}
         */
        function () {
            return this._disabled || !!(this.dropContainer && this.dropContainer.disabled);
        },
        set: /**
         * @param {?} value
         * @return {?}
         */
        function (value) {
            this._disabled = coercion.coerceBooleanProperty(value);
        },
        enumerable: true,
        configurable: true
    });
    /**
     * Returns the element that is being used as a placeholder
     * while the current element is being dragged.
     */
    /**
     * Returns the element that is being used as a placeholder
     * while the current element is being dragged.
     * @return {?}
     */
    DragRef.prototype.getPlaceholderElement = /**
     * Returns the element that is being used as a placeholder
     * while the current element is being dragged.
     * @return {?}
     */
    function () {
        return this._placeholder;
    };
    /** Returns the root draggable element. */
    /**
     * Returns the root draggable element.
     * @return {?}
     */
    DragRef.prototype.getRootElement = /**
     * Returns the root draggable element.
     * @return {?}
     */
    function () {
        return this._rootElement;
    };
    /** Registers the handles that can be used to drag the element. */
    /**
     * Registers the handles that can be used to drag the element.
     * @template THIS
     * @this {THIS}
     * @param {?} handles
     * @return {THIS}
     */
    DragRef.prototype.withHandles = /**
     * Registers the handles that can be used to drag the element.
     * @template THIS
     * @this {THIS}
     * @param {?} handles
     * @return {THIS}
     */
    function (handles) {
        // TODO(crisbeto): have this accept HTMLElement[] | ElementRef<HTMLElement>[]
        (/** @type {?} */ (this))._handles = handles;
        handles.forEach(function (handle) { return toggleNativeDragInteractions(handle.element.nativeElement, false); });
        (/** @type {?} */ (this))._toggleNativeDragInteractions();
        return (/** @type {?} */ (this));
    };
    /** Registers the template that should be used for the drag preview. */
    /**
     * Registers the template that should be used for the drag preview.
     * @template THIS
     * @this {THIS}
     * @param {?} template
     * @return {THIS}
     */
    DragRef.prototype.withPreviewTemplate = /**
     * Registers the template that should be used for the drag preview.
     * @template THIS
     * @this {THIS}
     * @param {?} template
     * @return {THIS}
     */
    function (template) {
        // TODO(crisbeto): have this accept a TemplateRef
        (/** @type {?} */ (this))._previewTemplate = template;
        return (/** @type {?} */ (this));
    };
    /** Registers the template that should be used for the drag placeholder. */
    /**
     * Registers the template that should be used for the drag placeholder.
     * @template THIS
     * @this {THIS}
     * @param {?} template
     * @return {THIS}
     */
    DragRef.prototype.withPlaceholderTemplate = /**
     * Registers the template that should be used for the drag placeholder.
     * @template THIS
     * @this {THIS}
     * @param {?} template
     * @return {THIS}
     */
    function (template) {
        // TODO(crisbeto): have this accept a TemplateRef
        (/** @type {?} */ (this))._placeholderTemplate = template;
        return (/** @type {?} */ (this));
    };
    /**
     * Sets an alternate drag root element. The root element is the element that will be moved as
     * the user is dragging. Passing an alternate root element is useful when trying to enable
     * dragging on an element that you might not have access to.
     */
    /**
     * Sets an alternate drag root element. The root element is the element that will be moved as
     * the user is dragging. Passing an alternate root element is useful when trying to enable
     * dragging on an element that you might not have access to.
     * @template THIS
     * @this {THIS}
     * @param {?} rootElement
     * @return {THIS}
     */
    DragRef.prototype.withRootElement = /**
     * Sets an alternate drag root element. The root element is the element that will be moved as
     * the user is dragging. Passing an alternate root element is useful when trying to enable
     * dragging on an element that you might not have access to.
     * @template THIS
     * @this {THIS}
     * @param {?} rootElement
     * @return {THIS}
     */
    function (rootElement) {
        /** @type {?} */
        var element = rootElement instanceof core.ElementRef ? rootElement.nativeElement : rootElement;
        if (element !== (/** @type {?} */ (this))._rootElement) {
            if ((/** @type {?} */ (this))._rootElement) {
                (/** @type {?} */ (this))._removeRootElementListeners((/** @type {?} */ (this))._rootElement);
            }
            element.addEventListener('mousedown', (/** @type {?} */ (this))._pointerDown, activeEventListenerOptions);
            element.addEventListener('touchstart', (/** @type {?} */ (this))._pointerDown, passiveEventListenerOptions);
            (/** @type {?} */ (this))._rootElement = element;
        }
        return (/** @type {?} */ (this));
    };
    /**
     * Element to which the draggable's position will be constrained.
     */
    /**
     * Element to which the draggable's position will be constrained.
     * @template THIS
     * @this {THIS}
     * @param {?} boundaryElement
     * @return {THIS}
     */
    DragRef.prototype.withBoundaryElement = /**
     * Element to which the draggable's position will be constrained.
     * @template THIS
     * @this {THIS}
     * @param {?} boundaryElement
     * @return {THIS}
     */
    function (boundaryElement) {
        (/** @type {?} */ (this))._boundaryElement = boundaryElement instanceof core.ElementRef ?
            boundaryElement.nativeElement : boundaryElement;
        return (/** @type {?} */ (this));
    };
    /** Removes the dragging functionality from the DOM element. */
    /**
     * Removes the dragging functionality from the DOM element.
     * @return {?}
     */
    DragRef.prototype.dispose = /**
     * Removes the dragging functionality from the DOM element.
     * @return {?}
     */
    function () {
        this._removeRootElementListeners(this._rootElement);
        // Do this check before removing from the registry since it'll
        // stop being considered as dragged once it is removed.
        if (this.isDragging()) {
            // Since we move out the element to the end of the body while it's being
            // dragged, we have to make sure that it's removed if it gets destroyed.
            removeElement(this._rootElement);
        }
        this._destroyPreview();
        this._destroyPlaceholder();
        this._dragDropRegistry.removeDragItem(this);
        this._removeSubscriptions();
        this.beforeStarted.complete();
        this.started.complete();
        this.released.complete();
        this.ended.complete();
        this.entered.complete();
        this.exited.complete();
        this.dropped.complete();
        this._moveEvents.complete();
        this._handles = [];
        this._boundaryElement = this._rootElement = this._placeholderTemplate =
            this._previewTemplate = this._nextSibling = (/** @type {?} */ (null));
    };
    /** Checks whether the element is currently being dragged. */
    /**
     * Checks whether the element is currently being dragged.
     * @return {?}
     */
    DragRef.prototype.isDragging = /**
     * Checks whether the element is currently being dragged.
     * @return {?}
     */
    function () {
        return this._hasStartedDragging && this._dragDropRegistry.isDragging(this);
    };
    /** Resets a standalone drag item to its initial position. */
    /**
     * Resets a standalone drag item to its initial position.
     * @return {?}
     */
    DragRef.prototype.reset = /**
     * Resets a standalone drag item to its initial position.
     * @return {?}
     */
    function () {
        this._rootElement.style.transform = '';
        this._activeTransform = { x: 0, y: 0 };
        this._passiveTransform = { x: 0, y: 0 };
    };
    /** Unsubscribes from the global subscriptions. */
    /**
     * Unsubscribes from the global subscriptions.
     * @private
     * @return {?}
     */
    DragRef.prototype._removeSubscriptions = /**
     * Unsubscribes from the global subscriptions.
     * @private
     * @return {?}
     */
    function () {
        this._pointerMoveSubscription.unsubscribe();
        this._pointerUpSubscription.unsubscribe();
    };
    /** Destroys the preview element and its ViewRef. */
    /**
     * Destroys the preview element and its ViewRef.
     * @private
     * @return {?}
     */
    DragRef.prototype._destroyPreview = /**
     * Destroys the preview element and its ViewRef.
     * @private
     * @return {?}
     */
    function () {
        if (this._preview) {
            removeElement(this._preview);
        }
        if (this._previewRef) {
            this._previewRef.destroy();
        }
        this._preview = this._previewRef = (/** @type {?} */ (null));
    };
    /** Destroys the placeholder element and its ViewRef. */
    /**
     * Destroys the placeholder element and its ViewRef.
     * @private
     * @return {?}
     */
    DragRef.prototype._destroyPlaceholder = /**
     * Destroys the placeholder element and its ViewRef.
     * @private
     * @return {?}
     */
    function () {
        if (this._placeholder) {
            removeElement(this._placeholder);
        }
        if (this._placeholderRef) {
            this._placeholderRef.destroy();
        }
        this._placeholder = this._placeholderRef = (/** @type {?} */ (null));
    };
    /** Starts the dragging sequence. */
    /**
     * Starts the dragging sequence.
     * @private
     * @param {?} event
     * @return {?}
     */
    DragRef.prototype._startDragSequence = /**
     * Starts the dragging sequence.
     * @private
     * @param {?} event
     * @return {?}
     */
    function (event) {
        // Emit the event on the item before the one on the container.
        this.started.next({ source: this });
        if (isTouchEvent(event)) {
            this._lastTouchEventTime = Date.now();
        }
        if (this.dropContainer) {
            /** @type {?} */
            var element = this._rootElement;
            // Grab the `nextSibling` before the preview and placeholder
            // have been created so we don't get the preview by accident.
            this._nextSibling = element.nextSibling;
            /** @type {?} */
            var preview = this._preview = this._createPreviewElement();
            /** @type {?} */
            var placeholder = this._placeholder = this._createPlaceholderElement();
            // We move the element out at the end of the body and we make it hidden, because keeping it in
            // place will throw off the consumer's `:last-child` selectors. We can't remove the element
            // from the DOM completely, because iOS will stop firing all subsequent events in the chain.
            element.style.display = 'none';
            this._document.body.appendChild((/** @type {?} */ (element.parentNode)).replaceChild(placeholder, element));
            this._document.body.appendChild(preview);
            this.dropContainer.start();
        }
    };
    /**
     * Sets up the different variables and subscriptions
     * that will be necessary for the dragging sequence.
     * @param referenceElement Element that started the drag sequence.
     * @param event Browser event object that started the sequence.
     */
    /**
     * Sets up the different variables and subscriptions
     * that will be necessary for the dragging sequence.
     * @private
     * @param {?} referenceElement Element that started the drag sequence.
     * @param {?} event Browser event object that started the sequence.
     * @return {?}
     */
    DragRef.prototype._initializeDragSequence = /**
     * Sets up the different variables and subscriptions
     * that will be necessary for the dragging sequence.
     * @private
     * @param {?} referenceElement Element that started the drag sequence.
     * @param {?} event Browser event object that started the sequence.
     * @return {?}
     */
    function (referenceElement, event) {
        // Always stop propagation for the event that initializes
        // the dragging sequence, in order to prevent it from potentially
        // starting another sequence for a draggable parent somewhere up the DOM tree.
        event.stopPropagation();
        /** @type {?} */
        var isDragging = this.isDragging();
        /** @type {?} */
        var isTouchSequence = isTouchEvent(event);
        /** @type {?} */
        var isAuxiliaryMouseButton = !isTouchSequence && ((/** @type {?} */ (event))).button !== 0;
        /** @type {?} */
        var rootElement = this._rootElement;
        /** @type {?} */
        var isSyntheticEvent = !isTouchSequence && this._lastTouchEventTime &&
            this._lastTouchEventTime + MOUSE_EVENT_IGNORE_TIME > Date.now();
        // If the event started from an element with the native HTML drag&drop, it'll interfere
        // with our own dragging (e.g. `img` tags do it by default). Prevent the default action
        // to stop it from happening. Note that preventing on `dragstart` also seems to work, but
        // it's flaky and it fails if the user drags it away quickly. Also note that we only want
        // to do this for `mousedown` since doing the same for `touchstart` will stop any `click`
        // events from firing on touch devices.
        if (event.target && ((/** @type {?} */ (event.target))).draggable && event.type === 'mousedown') {
            event.preventDefault();
        }
        // Abort if the user is already dragging or is using a mouse button other than the primary one.
        if (isDragging || isAuxiliaryMouseButton || isSyntheticEvent) {
            return;
        }
        // Cache the previous transform amount only after the first drag sequence, because
        // we don't want our own transforms to stack on top of each other.
        if (this._initialTransform == null) {
            this._initialTransform = this._rootElement.style.transform || '';
        }
        // If we've got handles, we need to disable the tap highlight on the entire root element,
        // otherwise iOS will still add it, even though all the drag interactions on the handle
        // are disabled.
        if (this._handles.length) {
            this._rootElementTapHighlight = rootElement.style.webkitTapHighlightColor;
            rootElement.style.webkitTapHighlightColor = 'transparent';
        }
        this._toggleNativeDragInteractions();
        this._hasStartedDragging = this._hasMoved = false;
        this._initialContainer = (/** @type {?} */ (this.dropContainer));
        this._pointerMoveSubscription = this._dragDropRegistry.pointerMove.subscribe(this._pointerMove);
        this._pointerUpSubscription = this._dragDropRegistry.pointerUp.subscribe(this._pointerUp);
        this._scrollPosition = this._viewportRuler.getViewportScrollPosition();
        if (this._boundaryElement) {
            this._boundaryRect = this._boundaryElement.getBoundingClientRect();
        }
        // If we have a custom preview template, the element won't be visible anyway so we avoid the
        // extra `getBoundingClientRect` calls and just move the preview next to the cursor.
        this._pickupPositionInElement = this._previewTemplate ? { x: 0, y: 0 } :
            this._getPointerPositionInElement(referenceElement, event);
        /** @type {?} */
        var pointerPosition = this._pickupPositionOnPage = this._getPointerPositionOnPage(event);
        this._pointerDirectionDelta = { x: 0, y: 0 };
        this._pointerPositionAtLastDirectionChange = { x: pointerPosition.x, y: pointerPosition.y };
        this._dragDropRegistry.startDragging(this, event);
    };
    /** Cleans up the DOM artifacts that were added to facilitate the element being dragged. */
    /**
     * Cleans up the DOM artifacts that were added to facilitate the element being dragged.
     * @private
     * @param {?} event
     * @return {?}
     */
    DragRef.prototype._cleanupDragArtifacts = /**
     * Cleans up the DOM artifacts that were added to facilitate the element being dragged.
     * @private
     * @param {?} event
     * @return {?}
     */
    function (event) {
        var _this = this;
        // Restore the element's visibility and insert it at its old position in the DOM.
        // It's important that we maintain the position, because moving the element around in the DOM
        // can throw off `NgFor` which does smart diffing and re-creates elements only when necessary,
        // while moving the existing elements in all other cases.
        this._rootElement.style.display = '';
        if (this._nextSibling) {
            (/** @type {?} */ (this._nextSibling.parentNode)).insertBefore(this._rootElement, this._nextSibling);
        }
        else {
            this._initialContainer.element.nativeElement.appendChild(this._rootElement);
        }
        this._destroyPreview();
        this._destroyPlaceholder();
        this._boundaryRect = this._previewRect = undefined;
        // Re-enter the NgZone since we bound `document` events on the outside.
        this._ngZone.run(function () {
            /** @type {?} */
            var container = (/** @type {?} */ (_this.dropContainer));
            /** @type {?} */
            var currentIndex = container.getItemIndex(_this);
            var _a = _this._getPointerPositionOnPage(event), x = _a.x, y = _a.y;
            /** @type {?} */
            var isPointerOverContainer = container._isOverContainer(x, y);
            _this.ended.next({ source: _this });
            _this.dropped.next({
                item: _this,
                currentIndex: currentIndex,
                previousIndex: _this._initialContainer.getItemIndex(_this),
                container: container,
                previousContainer: _this._initialContainer,
                isPointerOverContainer: isPointerOverContainer
            });
            container.drop(_this, currentIndex, _this._initialContainer, isPointerOverContainer);
            _this.dropContainer = _this._initialContainer;
        });
    };
    /**
     * Updates the item's position in its drop container, or moves it
     * into a new one, depending on its current drag position.
     */
    /**
     * Updates the item's position in its drop container, or moves it
     * into a new one, depending on its current drag position.
     * @private
     * @param {?} __0
     * @return {?}
     */
    DragRef.prototype._updateActiveDropContainer = /**
     * Updates the item's position in its drop container, or moves it
     * into a new one, depending on its current drag position.
     * @private
     * @param {?} __0
     * @return {?}
     */
    function (_a) {
        var _this = this;
        var x = _a.x, y = _a.y;
        // Drop container that draggable has been moved into.
        /** @type {?} */
        var newContainer = (/** @type {?} */ (this.dropContainer))._getSiblingContainerFromPosition(this, x, y);
        // If we couldn't find a new container to move the item into, and the item has left it's
        // initial container, check whether the it's over the initial container. This handles the
        // case where two containers are connected one way and the user tries to undo dragging an
        // item into a new container.
        if (!newContainer && this.dropContainer !== this._initialContainer &&
            this._initialContainer._isOverContainer(x, y)) {
            newContainer = this._initialContainer;
        }
        if (newContainer) {
            this._ngZone.run(function () {
                // Notify the old container that the item has left.
                _this.exited.next({ item: _this, container: (/** @type {?} */ (_this.dropContainer)) });
                (/** @type {?} */ (_this.dropContainer)).exit(_this);
                // Notify the new container that the item has entered.
                _this.entered.next({ item: _this, container: (/** @type {?} */ (newContainer)) });
                _this.dropContainer = (/** @type {?} */ (newContainer));
                _this.dropContainer.enter(_this, x, y);
            });
        }
        (/** @type {?} */ (this.dropContainer))._sortItem(this, x, y, this._pointerDirectionDelta);
        this._preview.style.transform =
            getTransform(x - this._pickupPositionInElement.x, y - this._pickupPositionInElement.y);
    };
    /**
     * Creates the element that will be rendered next to the user's pointer
     * and will be used as a preview of the element that is being dragged.
     */
    /**
     * Creates the element that will be rendered next to the user's pointer
     * and will be used as a preview of the element that is being dragged.
     * @private
     * @return {?}
     */
    DragRef.prototype._createPreviewElement = /**
     * Creates the element that will be rendered next to the user's pointer
     * and will be used as a preview of the element that is being dragged.
     * @private
     * @return {?}
     */
    function () {
        /** @type {?} */
        var preview;
        if (this._previewTemplate) {
            /** @type {?} */
            var viewRef = this._viewContainerRef.createEmbeddedView(this._previewTemplate.templateRef, this._previewTemplate.data);
            preview = viewRef.rootNodes[0];
            this._previewRef = viewRef;
            preview.style.transform =
                getTransform(this._pickupPositionOnPage.x, this._pickupPositionOnPage.y);
        }
        else {
            /** @type {?} */
            var element = this._rootElement;
            /** @type {?} */
            var elementRect = element.getBoundingClientRect();
            preview = deepCloneNode(element);
            preview.style.width = elementRect.width + "px";
            preview.style.height = elementRect.height + "px";
            preview.style.transform = getTransform(elementRect.left, elementRect.top);
        }
        extendStyles(preview.style, {
            // It's important that we disable the pointer events on the preview, because
            // it can throw off the `document.elementFromPoint` calls in the `CdkDropList`.
            pointerEvents: 'none',
            position: 'fixed',
            top: '0',
            left: '0',
            zIndex: '1000'
        });
        toggleNativeDragInteractions(preview, false);
        preview.classList.add('cdk-drag-preview');
        preview.setAttribute('dir', this._dir ? this._dir.value : 'ltr');
        return preview;
    };
    /**
     * Animates the preview element from its current position to the location of the drop placeholder.
     * @returns Promise that resolves when the animation completes.
     */
    /**
     * Animates the preview element from its current position to the location of the drop placeholder.
     * @private
     * @return {?} Promise that resolves when the animation completes.
     */
    DragRef.prototype._animatePreviewToPlaceholder = /**
     * Animates the preview element from its current position to the location of the drop placeholder.
     * @private
     * @return {?} Promise that resolves when the animation completes.
     */
    function () {
        var _this = this;
        // If the user hasn't moved yet, the transitionend event won't fire.
        if (!this._hasMoved) {
            return Promise.resolve();
        }
        /** @type {?} */
        var placeholderRect = this._placeholder.getBoundingClientRect();
        // Apply the class that adds a transition to the preview.
        this._preview.classList.add('cdk-drag-animating');
        // Move the preview to the placeholder position.
        this._preview.style.transform = getTransform(placeholderRect.left, placeholderRect.top);
        // If the element doesn't have a `transition`, the `transitionend` event won't fire. Since
        // we need to trigger a style recalculation in order for the `cdk-drag-animating` class to
        // apply its style, we take advantage of the available info to figure out whether we need to
        // bind the event in the first place.
        /** @type {?} */
        var duration = getTransformTransitionDurationInMs(this._preview);
        if (duration === 0) {
            return Promise.resolve();
        }
        return this._ngZone.runOutsideAngular(function () {
            return new Promise(function (resolve) {
                /** @type {?} */
                var handler = (/** @type {?} */ ((function (event) {
                    if (!event || (event.target === _this._preview && event.propertyName === 'transform')) {
                        _this._preview.removeEventListener('transitionend', handler);
                        resolve();
                        clearTimeout(timeout);
                    }
                })));
                // If a transition is short enough, the browser might not fire the `transitionend` event.
                // Since we know how long it's supposed to take, add a timeout with a 50% buffer that'll
                // fire if the transition hasn't completed when it was supposed to.
                /** @type {?} */
                var timeout = setTimeout((/** @type {?} */ (handler)), duration * 1.5);
                _this._preview.addEventListener('transitionend', handler);
            });
        });
    };
    /** Creates an element that will be shown instead of the current element while dragging. */
    /**
     * Creates an element that will be shown instead of the current element while dragging.
     * @private
     * @return {?}
     */
    DragRef.prototype._createPlaceholderElement = /**
     * Creates an element that will be shown instead of the current element while dragging.
     * @private
     * @return {?}
     */
    function () {
        /** @type {?} */
        var placeholder;
        if (this._placeholderTemplate) {
            this._placeholderRef = this._viewContainerRef.createEmbeddedView(this._placeholderTemplate.templateRef, this._placeholderTemplate.data);
            placeholder = this._placeholderRef.rootNodes[0];
        }
        else {
            placeholder = deepCloneNode(this._rootElement);
        }
        placeholder.classList.add('cdk-drag-placeholder');
        return placeholder;
    };
    /**
     * Figures out the coordinates at which an element was picked up.
     * @param referenceElement Element that initiated the dragging.
     * @param event Event that initiated the dragging.
     */
    /**
     * Figures out the coordinates at which an element was picked up.
     * @private
     * @param {?} referenceElement Element that initiated the dragging.
     * @param {?} event Event that initiated the dragging.
     * @return {?}
     */
    DragRef.prototype._getPointerPositionInElement = /**
     * Figures out the coordinates at which an element was picked up.
     * @private
     * @param {?} referenceElement Element that initiated the dragging.
     * @param {?} event Event that initiated the dragging.
     * @return {?}
     */
    function (referenceElement, event) {
        /** @type {?} */
        var elementRect = this._rootElement.getBoundingClientRect();
        /** @type {?} */
        var handleElement = referenceElement === this._rootElement ? null : referenceElement;
        /** @type {?} */
        var referenceRect = handleElement ? handleElement.getBoundingClientRect() : elementRect;
        /** @type {?} */
        var point = isTouchEvent(event) ? event.targetTouches[0] : event;
        /** @type {?} */
        var x = point.pageX - referenceRect.left - this._scrollPosition.left;
        /** @type {?} */
        var y = point.pageY - referenceRect.top - this._scrollPosition.top;
        return {
            x: referenceRect.left - elementRect.left + x,
            y: referenceRect.top - elementRect.top + y
        };
    };
    /** Determines the point of the page that was touched by the user. */
    /**
     * Determines the point of the page that was touched by the user.
     * @private
     * @param {?} event
     * @return {?}
     */
    DragRef.prototype._getPointerPositionOnPage = /**
     * Determines the point of the page that was touched by the user.
     * @private
     * @param {?} event
     * @return {?}
     */
    function (event) {
        // `touches` will be empty for start/end events so we have to fall back to `changedTouches`.
        /** @type {?} */
        var point = isTouchEvent(event) ? (event.touches[0] || event.changedTouches[0]) : event;
        return {
            x: point.pageX - this._scrollPosition.left,
            y: point.pageY - this._scrollPosition.top
        };
    };
    /** Gets the pointer position on the page, accounting for any position constraints. */
    /**
     * Gets the pointer position on the page, accounting for any position constraints.
     * @private
     * @param {?} event
     * @return {?}
     */
    DragRef.prototype._getConstrainedPointerPosition = /**
     * Gets the pointer position on the page, accounting for any position constraints.
     * @private
     * @param {?} event
     * @return {?}
     */
    function (event) {
        /** @type {?} */
        var point = this._getPointerPositionOnPage(event);
        /** @type {?} */
        var dropContainerLock = this.dropContainer ? this.dropContainer.lockAxis : null;
        if (this.lockAxis === 'x' || dropContainerLock === 'x') {
            point.y = this._pickupPositionOnPage.y;
        }
        else if (this.lockAxis === 'y' || dropContainerLock === 'y') {
            point.x = this._pickupPositionOnPage.x;
        }
        if (this._boundaryRect) {
            var _a = this._pickupPositionInElement, pickupX = _a.x, pickupY = _a.y;
            /** @type {?} */
            var boundaryRect = this._boundaryRect;
            /** @type {?} */
            var previewRect = (/** @type {?} */ (this._previewRect));
            /** @type {?} */
            var minY = boundaryRect.top + pickupY;
            /** @type {?} */
            var maxY = boundaryRect.bottom - (previewRect.height - pickupY);
            /** @type {?} */
            var minX = boundaryRect.left + pickupX;
            /** @type {?} */
            var maxX = boundaryRect.right - (previewRect.width - pickupX);
            point.x = clamp$1(point.x, minX, maxX);
            point.y = clamp$1(point.y, minY, maxY);
        }
        return point;
    };
    /** Updates the current drag delta, based on the user's current pointer position on the page. */
    /**
     * Updates the current drag delta, based on the user's current pointer position on the page.
     * @private
     * @param {?} pointerPositionOnPage
     * @return {?}
     */
    DragRef.prototype._updatePointerDirectionDelta = /**
     * Updates the current drag delta, based on the user's current pointer position on the page.
     * @private
     * @param {?} pointerPositionOnPage
     * @return {?}
     */
    function (pointerPositionOnPage) {
        var x = pointerPositionOnPage.x, y = pointerPositionOnPage.y;
        /** @type {?} */
        var delta = this._pointerDirectionDelta;
        /** @type {?} */
        var positionSinceLastChange = this._pointerPositionAtLastDirectionChange;
        // Amount of pixels the user has dragged since the last time the direction changed.
        /** @type {?} */
        var changeX = Math.abs(x - positionSinceLastChange.x);
        /** @type {?} */
        var changeY = Math.abs(y - positionSinceLastChange.y);
        // Because we handle pointer events on a per-pixel basis, we don't want the delta
        // to change for every pixel, otherwise anything that depends on it can look erratic.
        // To make the delta more consistent, we track how much the user has moved since the last
        // delta change and we only update it after it has reached a certain threshold.
        if (changeX > this._config.pointerDirectionChangeThreshold) {
            delta.x = x > positionSinceLastChange.x ? 1 : -1;
            positionSinceLastChange.x = x;
        }
        if (changeY > this._config.pointerDirectionChangeThreshold) {
            delta.y = y > positionSinceLastChange.y ? 1 : -1;
            positionSinceLastChange.y = y;
        }
        return delta;
    };
    /** Toggles the native drag interactions, based on how many handles are registered. */
    /**
     * Toggles the native drag interactions, based on how many handles are registered.
     * @private
     * @return {?}
     */
    DragRef.prototype._toggleNativeDragInteractions = /**
     * Toggles the native drag interactions, based on how many handles are registered.
     * @private
     * @return {?}
     */
    function () {
        /** @type {?} */
        var shouldEnable = this._handles.length > 0;
        // We go through the trouble of keeping track of whether the interactions are enabled,
        // because we want to avoid triggering style recalculations unless we really have to.
        if (shouldEnable !== this._nativeInteractionsEnabled) {
            this._nativeInteractionsEnabled = shouldEnable;
            toggleNativeDragInteractions(this._rootElement, shouldEnable);
        }
    };
    /** Removes the manually-added event listeners from the root element. */
    /**
     * Removes the manually-added event listeners from the root element.
     * @private
     * @param {?} element
     * @return {?}
     */
    DragRef.prototype._removeRootElementListeners = /**
     * Removes the manually-added event listeners from the root element.
     * @private
     * @param {?} element
     * @return {?}
     */
    function (element) {
        element.removeEventListener('mousedown', this._pointerDown, activeEventListenerOptions);
        element.removeEventListener('touchstart', this._pointerDown, passiveEventListenerOptions);
    };
    return DragRef;
}());
/**
 * Gets a 3d `transform` that can be applied to an element.
 * @param {?} x Desired position of the element along the X axis.
 * @param {?} y Desired position of the element along the Y axis.
 * @return {?}
 */
function getTransform(x, y) {
    // Round the transforms since some browsers will
    // blur the elements for sub-pixel transforms.
    return "translate3d(" + Math.round(x) + "px, " + Math.round(y) + "px, 0)";
}
/**
 * Creates a deep clone of an element.
 * @param {?} node
 * @return {?}
 */
function deepCloneNode(node) {
    /** @type {?} */
    var clone = (/** @type {?} */ (node.cloneNode(true)));
    // Remove the `id` to avoid having multiple elements with the same id on the page.
    clone.removeAttribute('id');
    return clone;
}
/**
 * Clamps a value between a minimum and a maximum.
 * @param {?} value
 * @param {?} min
 * @param {?} max
 * @return {?}
 */
function clamp$1(value, min, max) {
    return Math.max(min, Math.min(max, value));
}
/**
 * Helper to remove an element from the DOM and to do all the necessary null checks.
 * @param {?} element Element to be removed.
 * @return {?}
 */
function removeElement(element) {
    if (element && element.parentNode) {
        element.parentNode.removeChild(element);
    }
}
/**
 * Determines whether an event is a touch event.
 * @param {?} event
 * @return {?}
 */
function isTouchEvent(event) {
    return event.type.startsWith('touch');
}

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Injection token that can be used to configure the behavior of `CdkDrag`.
 * @type {?}
 */
var CDK_DRAG_CONFIG = new core.InjectionToken('CDK_DRAG_CONFIG', {
    providedIn: 'root',
    factory: CDK_DRAG_CONFIG_FACTORY
});
/**
 * \@docs-private
 * @return {?}
 */
function CDK_DRAG_CONFIG_FACTORY() {
    return { dragStartThreshold: 5, pointerDirectionChangeThreshold: 5 };
}
/**
 * Element that can be moved inside a CdkDropList container.
 * @template T
 */
var CdkDrag = /** @class */ (function () {
    function CdkDrag(element, dropContainer, _document, _ngZone, _viewContainerRef, _viewportRuler, _dragDropRegistry, _config, _dir) {
        var _this = this;
        this.element = element;
        this.dropContainer = dropContainer;
        this._document = _document;
        this._ngZone = _ngZone;
        this._viewContainerRef = _viewContainerRef;
        this._viewportRuler = _viewportRuler;
        this._dragDropRegistry = _dragDropRegistry;
        this._config = _config;
        this._dir = _dir;
        /**
         * Subscription to the stream that initializes the root element.
         */
        this._rootElementInitSubscription = rxjs.Subscription.EMPTY;
        this._disabled = false;
        /**
         * Emits when the user starts dragging the item.
         */
        this.started = new core.EventEmitter();
        /**
         * Emits when the user has released a drag item, before any animations have started.
         */
        this.released = new core.EventEmitter();
        /**
         * Emits when the user stops dragging an item in the container.
         */
        this.ended = new core.EventEmitter();
        /**
         * Emits when the user has moved the item into a new container.
         */
        this.entered = new core.EventEmitter();
        /**
         * Emits when the user removes the item its container by dragging it into another container.
         */
        this.exited = new core.EventEmitter();
        /**
         * Emits when the user drops the item inside a container.
         */
        this.dropped = new core.EventEmitter();
        /**
         * Emits as the user is dragging the item. Use with caution,
         * because this event will fire for every pixel that the user has dragged.
         */
        this.moved = rxjs.Observable.create(function (observer) {
            /** @type {?} */
            var subscription = _this._dragRef.moved.pipe(operators.map(function (movedEvent) { return ({
                source: _this,
                pointerPosition: movedEvent.pointerPosition,
                event: movedEvent.event,
                delta: movedEvent.delta
            }); })).subscribe(observer);
            return function () {
                subscription.unsubscribe();
            };
        });
        /** @type {?} */
        var ref = this._dragRef = new DragRef(element, this._document, this._ngZone, this._viewContainerRef, this._viewportRuler, this._dragDropRegistry, this._config, this.dropContainer ? this.dropContainer._dropListRef : undefined, this._dir);
        ref.data = this;
        ref.beforeStarted.subscribe(function () {
            if (!ref.isDragging()) {
                ref.disabled = _this.disabled;
                ref.lockAxis = _this.lockAxis;
                ref
                    .withBoundaryElement(_this._getBoundaryElement())
                    .withPlaceholderTemplate(_this._placeholderTemplate)
                    .withPreviewTemplate(_this._previewTemplate);
            }
        });
        this._proxyEvents(ref);
    }
    Object.defineProperty(CdkDrag.prototype, "disabled", {
        /** Whether starting to drag this element is disabled. */
        get: /**
         * Whether starting to drag this element is disabled.
         * @return {?}
         */
        function () {
            return this._disabled || (this.dropContainer && this.dropContainer.disabled);
        },
        set: /**
         * @param {?} value
         * @return {?}
         */
        function (value) {
            this._disabled = coercion.coerceBooleanProperty(value);
        },
        enumerable: true,
        configurable: true
    });
    /**
     * Returns the element that is being used as a placeholder
     * while the current element is being dragged.
     */
    /**
     * Returns the element that is being used as a placeholder
     * while the current element is being dragged.
     * @return {?}
     */
    CdkDrag.prototype.getPlaceholderElement = /**
     * Returns the element that is being used as a placeholder
     * while the current element is being dragged.
     * @return {?}
     */
    function () {
        return this._dragRef.getPlaceholderElement();
    };
    /** Returns the root draggable element. */
    /**
     * Returns the root draggable element.
     * @return {?}
     */
    CdkDrag.prototype.getRootElement = /**
     * Returns the root draggable element.
     * @return {?}
     */
    function () {
        return this._dragRef.getRootElement();
    };
    /** Resets a standalone drag item to its initial position. */
    /**
     * Resets a standalone drag item to its initial position.
     * @return {?}
     */
    CdkDrag.prototype.reset = /**
     * Resets a standalone drag item to its initial position.
     * @return {?}
     */
    function () {
        this._dragRef.reset();
    };
    /**
     * @return {?}
     */
    CdkDrag.prototype.ngAfterViewInit = /**
     * @return {?}
     */
    function () {
        var _this = this;
        // We need to wait for the zone to stabilize, in order for the reference
        // element to be in the proper place in the DOM. This is mostly relevant
        // for draggable elements inside portals since they get stamped out in
        // their original DOM position and then they get transferred to the portal.
        this._rootElementInitSubscription = this._ngZone.onStable.asObservable()
            .pipe(operators.take(1))
            .subscribe(function () {
            /** @type {?} */
            var rootElement = _this._getRootElement();
            if (rootElement.nodeType !== _this._document.ELEMENT_NODE) {
                throw Error("cdkDrag must be attached to an element node. " +
                    ("Currently attached to \"" + rootElement.nodeName + "\"."));
            }
            _this._dragRef.withRootElement(rootElement);
            _this._handles.changes
                .pipe(operators.startWith(_this._handles))
                .subscribe(function (handleList) {
                _this._dragRef.withHandles(handleList.filter(function (handle) { return handle._parentDrag === _this; }));
            });
        });
    };
    /**
     * @return {?}
     */
    CdkDrag.prototype.ngOnDestroy = /**
     * @return {?}
     */
    function () {
        this._rootElementInitSubscription.unsubscribe();
        this._dragRef.dispose();
    };
    /** Gets the root draggable element, based on the `rootElementSelector`. */
    /**
     * Gets the root draggable element, based on the `rootElementSelector`.
     * @private
     * @return {?}
     */
    CdkDrag.prototype._getRootElement = /**
     * Gets the root draggable element, based on the `rootElementSelector`.
     * @private
     * @return {?}
     */
    function () {
        /** @type {?} */
        var element = this.element.nativeElement;
        /** @type {?} */
        var rootElement = this.rootElementSelector ?
            getClosestMatchingAncestor(element, this.rootElementSelector) : null;
        return rootElement || element;
    };
    /** Gets the boundary element, based on the `boundaryElementSelector`. */
    /**
     * Gets the boundary element, based on the `boundaryElementSelector`.
     * @private
     * @return {?}
     */
    CdkDrag.prototype._getBoundaryElement = /**
     * Gets the boundary element, based on the `boundaryElementSelector`.
     * @private
     * @return {?}
     */
    function () {
        /** @type {?} */
        var selector = this.boundaryElementSelector;
        return selector ? getClosestMatchingAncestor(this.element.nativeElement, selector) : null;
    };
    /**
     * Proxies the events from a DragRef to events that
     * match the interfaces of the CdkDrag outputs.
     */
    /**
     * Proxies the events from a DragRef to events that
     * match the interfaces of the CdkDrag outputs.
     * @private
     * @param {?} ref
     * @return {?}
     */
    CdkDrag.prototype._proxyEvents = /**
     * Proxies the events from a DragRef to events that
     * match the interfaces of the CdkDrag outputs.
     * @private
     * @param {?} ref
     * @return {?}
     */
    function (ref) {
        var _this = this;
        ref.started.subscribe(function () {
            _this.started.emit({ source: _this });
        });
        ref.released.subscribe(function () {
            _this.released.emit({ source: _this });
        });
        ref.ended.subscribe(function () {
            _this.ended.emit({ source: _this });
        });
        ref.entered.subscribe(function (event) {
            _this.entered.emit({
                container: event.container.data,
                item: _this
            });
        });
        ref.exited.subscribe(function (event) {
            _this.exited.emit({
                container: event.container.data,
                item: _this
            });
        });
        ref.dropped.subscribe(function (event) {
            _this.dropped.emit({
                previousIndex: event.previousIndex,
                currentIndex: event.currentIndex,
                previousContainer: event.previousContainer.data,
                container: event.container.data,
                isPointerOverContainer: event.isPointerOverContainer,
                item: _this
            });
        });
    };
    CdkDrag.decorators = [
        { type: core.Directive, args: [{
                    selector: '[cdkDrag]',
                    exportAs: 'cdkDrag',
                    host: {
                        'class': 'cdk-drag',
                        '[class.cdk-drag-dragging]': '_dragRef.isDragging()',
                    },
                    providers: [{ provide: CDK_DRAG_PARENT, useExisting: CdkDrag }]
                },] },
    ];
    /** @nocollapse */
    CdkDrag.ctorParameters = function () { return [
        { type: core.ElementRef },
        { type: undefined, decorators: [{ type: core.Inject, args: [CDK_DROP_LIST,] }, { type: core.Optional }, { type: core.SkipSelf }] },
        { type: undefined, decorators: [{ type: core.Inject, args: [common.DOCUMENT,] }] },
        { type: core.NgZone },
        { type: core.ViewContainerRef },
        { type: scrolling.ViewportRuler },
        { type: DragDropRegistry },
        { type: undefined, decorators: [{ type: core.Inject, args: [CDK_DRAG_CONFIG,] }] },
        { type: bidi.Directionality, decorators: [{ type: core.Optional }] }
    ]; };
    CdkDrag.propDecorators = {
        _handles: [{ type: core.ContentChildren, args: [CdkDragHandle, { descendants: true },] }],
        _previewTemplate: [{ type: core.ContentChild, args: [CdkDragPreview,] }],
        _placeholderTemplate: [{ type: core.ContentChild, args: [CdkDragPlaceholder,] }],
        data: [{ type: core.Input, args: ['cdkDragData',] }],
        lockAxis: [{ type: core.Input, args: ['cdkDragLockAxis',] }],
        rootElementSelector: [{ type: core.Input, args: ['cdkDragRootElement',] }],
        boundaryElementSelector: [{ type: core.Input, args: ['cdkDragBoundary',] }],
        disabled: [{ type: core.Input, args: ['cdkDragDisabled',] }],
        started: [{ type: core.Output, args: ['cdkDragStarted',] }],
        released: [{ type: core.Output, args: ['cdkDragReleased',] }],
        ended: [{ type: core.Output, args: ['cdkDragEnded',] }],
        entered: [{ type: core.Output, args: ['cdkDragEntered',] }],
        exited: [{ type: core.Output, args: ['cdkDragExited',] }],
        dropped: [{ type: core.Output, args: ['cdkDragDropped',] }],
        moved: [{ type: core.Output, args: ['cdkDragMoved',] }]
    };
    return CdkDrag;
}());
/**
 * Gets the closest ancestor of an element that matches a selector.
 * @param {?} element
 * @param {?} selector
 * @return {?}
 */
function getClosestMatchingAncestor(element, selector) {
    /** @type {?} */
    var currentElement = (/** @type {?} */ (element.parentElement));
    while (currentElement) {
        // IE doesn't support `matches` so we have to fall back to `msMatchesSelector`.
        if (currentElement.matches ? currentElement.matches(selector) :
            ((/** @type {?} */ (currentElement))).msMatchesSelector(selector)) {
            return currentElement;
        }
        currentElement = currentElement.parentElement;
    }
    return null;
}

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Declaratively connects sibling `cdkDropList` instances together. All of the `cdkDropList`
 * elements that are placed inside a `cdkDropListGroup` will be connected to each other
 * automatically. Can be used as an alternative to the `cdkDropListConnectedTo` input
 * from `cdkDropList`.
 * @template T
 */
var CdkDropListGroup = /** @class */ (function () {
    function CdkDropListGroup() {
        /**
         * Drop lists registered inside the group.
         */
        this._items = new Set();
        this._disabled = false;
    }
    Object.defineProperty(CdkDropListGroup.prototype, "disabled", {
        /** Whether starting a dragging sequence from inside this group is disabled. */
        get: /**
         * Whether starting a dragging sequence from inside this group is disabled.
         * @return {?}
         */
        function () { return this._disabled; },
        set: /**
         * @param {?} value
         * @return {?}
         */
        function (value) {
            this._disabled = coercion.coerceBooleanProperty(value);
        },
        enumerable: true,
        configurable: true
    });
    /**
     * @return {?}
     */
    CdkDropListGroup.prototype.ngOnDestroy = /**
     * @return {?}
     */
    function () {
        this._items.clear();
    };
    CdkDropListGroup.decorators = [
        { type: core.Directive, args: [{
                    selector: '[cdkDropListGroup]',
                    exportAs: 'cdkDropListGroup',
                },] },
    ];
    CdkDropListGroup.propDecorators = {
        disabled: [{ type: core.Input, args: ['cdkDropListGroupDisabled',] }]
    };
    return CdkDropListGroup;
}());

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Counter used to generate unique ids for drop refs.
 * @type {?}
 */
var _uniqueIdCounter = 0;
/**
 * Proximity, as a ratio to width/height, at which a
 * dragged item will affect the drop container.
 * @type {?}
 */
var DROP_PROXIMITY_THRESHOLD = 0.05;
/**
 * Reference to a drop list. Used to manipulate or dispose of the container.
 * \@docs-private
 * @template T
 */
var /**
 * Reference to a drop list. Used to manipulate or dispose of the container.
 * \@docs-private
 * @template T
 */
DropListRef = /** @class */ (function () {
    function DropListRef(element, _dragDropRegistry, _document, _dir) {
        this.element = element;
        this._dragDropRegistry = _dragDropRegistry;
        this._dir = _dir;
        /**
         * Unique ID for the drop list.
         * @deprecated No longer being used. To be removed.
         * \@breaking-change 8.0.0
         */
        this.id = "cdk-drop-list-ref-" + _uniqueIdCounter++;
        /**
         * Whether starting a dragging sequence from this container is disabled.
         */
        this.disabled = false;
        /**
         * Function that is used to determine whether an item
         * is allowed to be moved into a drop container.
         */
        this.enterPredicate = function () { return true; };
        /**
         * Emits right before dragging has started.
         */
        this.beforeStarted = new rxjs.Subject();
        /**
         * Emits when the user has moved a new drag item into this container.
         */
        this.entered = new rxjs.Subject();
        /**
         * Emits when the user removes an item from the container
         * by dragging it into another container.
         */
        this.exited = new rxjs.Subject();
        /**
         * Emits when the user drops an item inside the container.
         */
        this.dropped = new rxjs.Subject();
        /**
         * Emits as the user is swapping items while actively dragging.
         */
        this.sorted = new rxjs.Subject();
        /**
         * Whether an item in the list is being dragged.
         */
        this._isDragging = false;
        /**
         * Cache of the dimensions of all the items and the sibling containers.
         */
        this._positionCache = { items: [], siblings: [], self: (/** @type {?} */ ({})) };
        /**
         * Keeps track of the item that was last swapped with the dragged item, as
         * well as what direction the pointer was moving in when the swap occured.
         */
        this._previousSwap = { drag: (/** @type {?} */ (null)), delta: 0 };
        this._siblings = [];
        /**
         * Direction in which the list is oriented.
         */
        this._orientation = 'vertical';
        /**
         * Amount of connected siblings that currently have a dragged item.
         */
        this._activeSiblings = 0;
        _dragDropRegistry.registerDropContainer(this);
        this._document = _document;
    }
    /** Removes the drop list functionality from the DOM element. */
    /**
     * Removes the drop list functionality from the DOM element.
     * @return {?}
     */
    DropListRef.prototype.dispose = /**
     * Removes the drop list functionality from the DOM element.
     * @return {?}
     */
    function () {
        this.beforeStarted.complete();
        this.entered.complete();
        this.exited.complete();
        this.dropped.complete();
        this.sorted.complete();
        this._dragDropRegistry.removeDropContainer(this);
    };
    /** Whether an item from this list is currently being dragged. */
    /**
     * Whether an item from this list is currently being dragged.
     * @return {?}
     */
    DropListRef.prototype.isDragging = /**
     * Whether an item from this list is currently being dragged.
     * @return {?}
     */
    function () {
        return this._isDragging;
    };
    /** Starts dragging an item. */
    /**
     * Starts dragging an item.
     * @return {?}
     */
    DropListRef.prototype.start = /**
     * Starts dragging an item.
     * @return {?}
     */
    function () {
        this.beforeStarted.next();
        this._isDragging = true;
        this._activeDraggables = this._draggables.slice();
        this._cachePositions();
        this._positionCache.siblings.forEach(function (sibling) { return sibling.drop._toggleIsReceiving(true); });
    };
    /**
     * Emits an event to indicate that the user moved an item into the container.
     * @param item Item that was moved into the container.
     * @param pointerX Position of the item along the X axis.
     * @param pointerY Position of the item along the Y axis.
     */
    /**
     * Emits an event to indicate that the user moved an item into the container.
     * @param {?} item Item that was moved into the container.
     * @param {?} pointerX Position of the item along the X axis.
     * @param {?} pointerY Position of the item along the Y axis.
     * @return {?}
     */
    DropListRef.prototype.enter = /**
     * Emits an event to indicate that the user moved an item into the container.
     * @param {?} item Item that was moved into the container.
     * @param {?} pointerX Position of the item along the X axis.
     * @param {?} pointerY Position of the item along the Y axis.
     * @return {?}
     */
    function (item, pointerX, pointerY) {
        this.entered.next({ item: item, container: this });
        this.start();
        // We use the coordinates of where the item entered the drop
        // zone to figure out at which index it should be inserted.
        /** @type {?} */
        var newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY);
        /** @type {?} */
        var currentIndex = this._activeDraggables.indexOf(item);
        /** @type {?} */
        var newPositionReference = this._activeDraggables[newIndex];
        /** @type {?} */
        var placeholder = item.getPlaceholderElement();
        // Since the item may be in the `activeDraggables` already (e.g. if the user dragged it
        // into another container and back again), we have to ensure that it isn't duplicated.
        if (currentIndex > -1) {
            this._activeDraggables.splice(currentIndex, 1);
        }
        // Don't use items that are being dragged as a reference, because
        // their element has been moved down to the bottom of the body.
        if (newPositionReference && !this._dragDropRegistry.isDragging(newPositionReference)) {
            /** @type {?} */
            var element = newPositionReference.getRootElement();
            (/** @type {?} */ (element.parentElement)).insertBefore(placeholder, element);
            this._activeDraggables.splice(newIndex, 0, item);
        }
        else {
            this.element.nativeElement.appendChild(placeholder);
            this._activeDraggables.push(item);
        }
        // The transform needs to be cleared so it doesn't throw off the measurements.
        placeholder.style.transform = '';
        // Note that the positions were already cached when we called `start` above,
        // but we need to refresh them since the amount of items has changed.
        this._cachePositions();
    };
    /**
     * Removes an item from the container after it was dragged into another container by the user.
     * @param item Item that was dragged out.
     */
    /**
     * Removes an item from the container after it was dragged into another container by the user.
     * @param {?} item Item that was dragged out.
     * @return {?}
     */
    DropListRef.prototype.exit = /**
     * Removes an item from the container after it was dragged into another container by the user.
     * @param {?} item Item that was dragged out.
     * @return {?}
     */
    function (item) {
        this._reset();
        this.exited.next({ item: item, container: this });
    };
    /**
     * Drops an item into this container.
     * @param item Item being dropped into the container.
     * @param currentIndex Index at which the item should be inserted.
     * @param previousContainer Container from which the item got dragged in.
     * @param isPointerOverContainer Whether the user's pointer was over the
     *    container when the item was dropped.
     */
    /**
     * Drops an item into this container.
     * @param {?} item Item being dropped into the container.
     * @param {?} currentIndex Index at which the item should be inserted.
     * @param {?} previousContainer Container from which the item got dragged in.
     * @param {?} isPointerOverContainer Whether the user's pointer was over the
     *    container when the item was dropped.
     * @return {?}
     */
    DropListRef.prototype.drop = /**
     * Drops an item into this container.
     * @param {?} item Item being dropped into the container.
     * @param {?} currentIndex Index at which the item should be inserted.
     * @param {?} previousContainer Container from which the item got dragged in.
     * @param {?} isPointerOverContainer Whether the user's pointer was over the
     *    container when the item was dropped.
     * @return {?}
     */
    function (item, currentIndex, previousContainer, isPointerOverContainer) {
        this._reset();
        this.dropped.next({
            item: item,
            currentIndex: currentIndex,
            previousIndex: previousContainer.getItemIndex(item),
            container: this,
            previousContainer: previousContainer,
            isPointerOverContainer: isPointerOverContainer
        });
    };
    /**
     * Sets the draggable items that are a part of this list.
     * @param items Items that are a part of this list.
     */
    /**
     * Sets the draggable items that are a part of this list.
     * @template THIS
     * @this {THIS}
     * @param {?} items Items that are a part of this list.
     * @return {THIS}
     */
    DropListRef.prototype.withItems = /**
     * Sets the draggable items that are a part of this list.
     * @template THIS
     * @this {THIS}
     * @param {?} items Items that are a part of this list.
     * @return {THIS}
     */
    function (items) {
        (/** @type {?} */ (this))._draggables = items.slice();
        return (/** @type {?} */ (this));
    };
    /**
     * Sets the containers that are connected to this one. When two or more containers are
     * connected, the user will be allowed to transfer items between them.
     * @param connectedTo Other containers that the current containers should be connected to.
     */
    /**
     * Sets the containers that are connected to this one. When two or more containers are
     * connected, the user will be allowed to transfer items between them.
     * @template THIS
     * @this {THIS}
     * @param {?} connectedTo Other containers that the current containers should be connected to.
     * @return {THIS}
     */
    DropListRef.prototype.connectedTo = /**
     * Sets the containers that are connected to this one. When two or more containers are
     * connected, the user will be allowed to transfer items between them.
     * @template THIS
     * @this {THIS}
     * @param {?} connectedTo Other containers that the current containers should be connected to.
     * @return {THIS}
     */
    function (connectedTo) {
        (/** @type {?} */ (this))._siblings = connectedTo.slice();
        return (/** @type {?} */ (this));
    };
    /**
     * Sets the orientation of the container.
     * @param orientation New orientation for the container.
     */
    /**
     * Sets the orientation of the container.
     * @template THIS
     * @this {THIS}
     * @param {?} orientation New orientation for the container.
     * @return {THIS}
     */
    DropListRef.prototype.withOrientation = /**
     * Sets the orientation of the container.
     * @template THIS
     * @this {THIS}
     * @param {?} orientation New orientation for the container.
     * @return {THIS}
     */
    function (orientation) {
        (/** @type {?} */ (this))._orientation = orientation;
        return (/** @type {?} */ (this));
    };
    /**
     * Figures out the index of an item in the container.
     * @param item Item whose index should be determined.
     */
    /**
     * Figures out the index of an item in the container.
     * @param {?} item Item whose index should be determined.
     * @return {?}
     */
    DropListRef.prototype.getItemIndex = /**
     * Figures out the index of an item in the container.
     * @param {?} item Item whose index should be determined.
     * @return {?}
     */
    function (item) {
        if (!this._isDragging) {
            return this._draggables.indexOf(item);
        }
        // Items are sorted always by top/left in the cache, however they flow differently in RTL.
        // The rest of the logic still stands no matter what orientation we're in, however
        // we need to invert the array when determining the index.
        /** @type {?} */
        var items = this._orientation === 'horizontal' && this._dir && this._dir.value === 'rtl' ?
            this._positionCache.items.slice().reverse() : this._positionCache.items;
        return findIndex(items, function (currentItem) { return currentItem.drag === item; });
    };
    /**
     * Whether the list is able to receive the item that
     * is currently being dragged inside a connected drop list.
     */
    /**
     * Whether the list is able to receive the item that
     * is currently being dragged inside a connected drop list.
     * @return {?}
     */
    DropListRef.prototype.isReceiving = /**
     * Whether the list is able to receive the item that
     * is currently being dragged inside a connected drop list.
     * @return {?}
     */
    function () {
        return this._activeSiblings > 0;
    };
    /**
     * Sorts an item inside the container based on its position.
     * @param item Item to be sorted.
     * @param pointerX Position of the item along the X axis.
     * @param pointerY Position of the item along the Y axis.
     * @param pointerDelta Direction in which the pointer is moving along each axis.
     */
    /**
     * Sorts an item inside the container based on its position.
     * @param {?} item Item to be sorted.
     * @param {?} pointerX Position of the item along the X axis.
     * @param {?} pointerY Position of the item along the Y axis.
     * @param {?} pointerDelta Direction in which the pointer is moving along each axis.
     * @return {?}
     */
    DropListRef.prototype._sortItem = /**
     * Sorts an item inside the container based on its position.
     * @param {?} item Item to be sorted.
     * @param {?} pointerX Position of the item along the X axis.
     * @param {?} pointerY Position of the item along the Y axis.
     * @param {?} pointerDelta Direction in which the pointer is moving along each axis.
     * @return {?}
     */
    function (item, pointerX, pointerY, pointerDelta) {
        // Don't sort the item if it's out of range.
        if (!this._isPointerNearDropContainer(pointerX, pointerY)) {
            return;
        }
        /** @type {?} */
        var siblings = this._positionCache.items;
        /** @type {?} */
        var newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY, pointerDelta);
        if (newIndex === -1 && siblings.length > 0) {
            return;
        }
        /** @type {?} */
        var isHorizontal = this._orientation === 'horizontal';
        /** @type {?} */
        var currentIndex = findIndex(siblings, function (currentItem) { return currentItem.drag === item; });
        /** @type {?} */
        var siblingAtNewPosition = siblings[newIndex];
        /** @type {?} */
        var currentPosition = siblings[currentIndex].clientRect;
        /** @type {?} */
        var newPosition = siblingAtNewPosition.clientRect;
        /** @type {?} */
        var delta = currentIndex > newIndex ? 1 : -1;
        this._previousSwap.drag = siblingAtNewPosition.drag;
        this._previousSwap.delta = isHorizontal ? pointerDelta.x : pointerDelta.y;
        // How many pixels the item's placeholder should be offset.
        /** @type {?} */
        var itemOffset = this._getItemOffsetPx(currentPosition, newPosition, delta);
        // How many pixels all the other items should be offset.
        /** @type {?} */
        var siblingOffset = this._getSiblingOffsetPx(currentIndex, siblings, delta);
        // Save the previous order of the items before moving the item to its new index.
        // We use this to check whether an item has been moved as a result of the sorting.
        /** @type {?} */
        var oldOrder = siblings.slice();
        // Shuffle the array in place.
        moveItemInArray(siblings, currentIndex, newIndex);
        this.sorted.next({
            previousIndex: currentIndex,
            currentIndex: newIndex,
            container: this,
            item: item
        });
        siblings.forEach(function (sibling, index) {
            // Don't do anything if the position hasn't changed.
            if (oldOrder[index] === sibling) {
                return;
            }
            /** @type {?} */
            var isDraggedItem = sibling.drag === item;
            /** @type {?} */
            var offset = isDraggedItem ? itemOffset : siblingOffset;
            /** @type {?} */
            var elementToOffset = isDraggedItem ? item.getPlaceholderElement() :
                sibling.drag.getRootElement();
            // Update the offset to reflect the new position.
            sibling.offset += offset;
            // Since we're moving the items with a `transform`, we need to adjust their cached
            // client rects to reflect their new position, as well as swap their positions in the cache.
            // Note that we shouldn't use `getBoundingClientRect` here to update the cache, because the
            // elements may be mid-animation which will give us a wrong result.
            if (isHorizontal) {
                // Round the transforms since some browsers will
                // blur the elements, for sub-pixel transforms.
                elementToOffset.style.transform = "translate3d(" + Math.round(sibling.offset) + "px, 0, 0)";
                adjustClientRect(sibling.clientRect, 0, offset);
            }
            else {
                elementToOffset.style.transform = "translate3d(0, " + Math.round(sibling.offset) + "px, 0)";
                adjustClientRect(sibling.clientRect, offset, 0);
            }
        });
    };
    /** Refreshes the position cache of the items and sibling containers. */
    /**
     * Refreshes the position cache of the items and sibling containers.
     * @private
     * @return {?}
     */
    DropListRef.prototype._cachePositions = /**
     * Refreshes the position cache of the items and sibling containers.
     * @private
     * @return {?}
     */
    function () {
        var _this = this;
        /** @type {?} */
        var isHorizontal = this._orientation === 'horizontal';
        this._positionCache.self = this.element.nativeElement.getBoundingClientRect();
        this._positionCache.items = this._activeDraggables
            .map(function (drag) {
            /** @type {?} */
            var elementToMeasure = _this._dragDropRegistry.isDragging(drag) ?
                // If the element is being dragged, we have to measure the
                // placeholder, because the element is hidden.
                drag.getPlaceholderElement() :
                drag.getRootElement();
            /** @type {?} */
            var clientRect = elementToMeasure.getBoundingClientRect();
            return {
                drag: drag,
                offset: 0,
                // We need to clone the `clientRect` here, because all the values on it are readonly
                // and we need to be able to update them. Also we can't use a spread here, because
                // the values on a `ClientRect` aren't own properties. See:
                // https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect#Notes
                clientRect: {
                    top: clientRect.top,
                    right: clientRect.right,
                    bottom: clientRect.bottom,
                    left: clientRect.left,
                    width: clientRect.width,
                    height: clientRect.height
                }
            };
        })
            .sort(function (a, b) {
            return isHorizontal ? a.clientRect.left - b.clientRect.left :
                a.clientRect.top - b.clientRect.top;
        });
        this._positionCache.siblings = this._siblings.map(function (drop) { return ({
            drop: drop,
            clientRect: drop.element.nativeElement.getBoundingClientRect()
        }); });
    };
    /**
     * Toggles whether the list can receive the item that is currently being dragged.
     * Usually called by a sibling that initiated the dragging.
     */
    /**
     * Toggles whether the list can receive the item that is currently being dragged.
     * Usually called by a sibling that initiated the dragging.
     * @param {?} isDragging
     * @return {?}
     */
    DropListRef.prototype._toggleIsReceiving = /**
     * Toggles whether the list can receive the item that is currently being dragged.
     * Usually called by a sibling that initiated the dragging.
     * @param {?} isDragging
     * @return {?}
     */
    function (isDragging) {
        this._activeSiblings = Math.max(0, this._activeSiblings + (isDragging ? 1 : -1));
    };
    /** Resets the container to its initial state. */
    /**
     * Resets the container to its initial state.
     * @private
     * @return {?}
     */
    DropListRef.prototype._reset = /**
     * Resets the container to its initial state.
     * @private
     * @return {?}
     */
    function () {
        this._isDragging = false;
        // TODO(crisbeto): may have to wait for the animations to finish.
        this._activeDraggables.forEach(function (item) { return item.getRootElement().style.transform = ''; });
        this._positionCache.siblings.forEach(function (sibling) { return sibling.drop._toggleIsReceiving(false); });
        this._activeDraggables = [];
        this._positionCache.items = [];
        this._positionCache.siblings = [];
        this._previousSwap.drag = null;
        this._previousSwap.delta = 0;
    };
    /**
     * Gets the offset in pixels by which the items that aren't being dragged should be moved.
     * @param currentIndex Index of the item currently being dragged.
     * @param siblings All of the items in the list.
     * @param delta Direction in which the user is moving.
     */
    /**
     * Gets the offset in pixels by which the items that aren't being dragged should be moved.
     * @private
     * @param {?} currentIndex Index of the item currently being dragged.
     * @param {?} siblings All of the items in the list.
     * @param {?} delta Direction in which the user is moving.
     * @return {?}
     */
    DropListRef.prototype._getSiblingOffsetPx = /**
     * Gets the offset in pixels by which the items that aren't being dragged should be moved.
     * @private
     * @param {?} currentIndex Index of the item currently being dragged.
     * @param {?} siblings All of the items in the list.
     * @param {?} delta Direction in which the user is moving.
     * @return {?}
     */
    function (currentIndex, siblings, delta) {
        /** @type {?} */
        var isHorizontal = this._orientation === 'horizontal';
        /** @type {?} */
        var currentPosition = siblings[currentIndex].clientRect;
        /** @type {?} */
        var immediateSibling = siblings[currentIndex + delta * -1];
        /** @type {?} */
        var siblingOffset = currentPosition[isHorizontal ? 'width' : 'height'] * delta;
        if (immediateSibling) {
            /** @type {?} */
            var start = isHorizontal ? 'left' : 'top';
            /** @type {?} */
            var end = isHorizontal ? 'right' : 'bottom';
            // Get the spacing between the start of the current item and the end of the one immediately
            // after it in the direction in which the user is dragging, or vice versa. We add it to the
            // offset in order to push the element to where it will be when it's inline and is influenced
            // by the `margin` of its siblings.
            if (delta === -1) {
                siblingOffset -= immediateSibling.clientRect[start] - currentPosition[end];
            }
            else {
                siblingOffset += currentPosition[start] - immediateSibling.clientRect[end];
            }
        }
        return siblingOffset;
    };
    /**
     * Checks whether the pointer coordinates are close to the drop container.
     * @param pointerX Coordinates along the X axis.
     * @param pointerY Coordinates along the Y axis.
     */
    /**
     * Checks whether the pointer coordinates are close to the drop container.
     * @private
     * @param {?} pointerX Coordinates along the X axis.
     * @param {?} pointerY Coordinates along the Y axis.
     * @return {?}
     */
    DropListRef.prototype._isPointerNearDropContainer = /**
     * Checks whether the pointer coordinates are close to the drop container.
     * @private
     * @param {?} pointerX Coordinates along the X axis.
     * @param {?} pointerY Coordinates along the Y axis.
     * @return {?}
     */
    function (pointerX, pointerY) {
        var _a = this._positionCache.self, top = _a.top, right = _a.right, bottom = _a.bottom, left = _a.left, width = _a.width, height = _a.height;
        /** @type {?} */
        var xThreshold = width * DROP_PROXIMITY_THRESHOLD;
        /** @type {?} */
        var yThreshold = height * DROP_PROXIMITY_THRESHOLD;
        return pointerY > top - yThreshold && pointerY < bottom + yThreshold &&
            pointerX > left - xThreshold && pointerX < right + xThreshold;
    };
    /**
     * Gets the offset in pixels by which the item that is being dragged should be moved.
     * @param currentPosition Current position of the item.
     * @param newPosition Position of the item where the current item should be moved.
     * @param delta Direction in which the user is moving.
     */
    /**
     * Gets the offset in pixels by which the item that is being dragged should be moved.
     * @private
     * @param {?} currentPosition Current position of the item.
     * @param {?} newPosition Position of the item where the current item should be moved.
     * @param {?} delta Direction in which the user is moving.
     * @return {?}
     */
    DropListRef.prototype._getItemOffsetPx = /**
     * Gets the offset in pixels by which the item that is being dragged should be moved.
     * @private
     * @param {?} currentPosition Current position of the item.
     * @param {?} newPosition Position of the item where the current item should be moved.
     * @param {?} delta Direction in which the user is moving.
     * @return {?}
     */
    function (currentPosition, newPosition, delta) {
        /** @type {?} */
        var isHorizontal = this._orientation === 'horizontal';
        /** @type {?} */
        var itemOffset = isHorizontal ? newPosition.left - currentPosition.left :
            newPosition.top - currentPosition.top;
        // Account for differences in the item width/height.
        if (delta === -1) {
            itemOffset += isHorizontal ? newPosition.width - currentPosition.width :
                newPosition.height - currentPosition.height;
        }
        return itemOffset;
    };
    /**
     * Gets the index of an item in the drop container, based on the position of the user's pointer.
     * @param item Item that is being sorted.
     * @param pointerX Position of the user's pointer along the X axis.
     * @param pointerY Position of the user's pointer along the Y axis.
     * @param delta Direction in which the user is moving their pointer.
     */
    /**
     * Gets the index of an item in the drop container, based on the position of the user's pointer.
     * @private
     * @param {?} item Item that is being sorted.
     * @param {?} pointerX Position of the user's pointer along the X axis.
     * @param {?} pointerY Position of the user's pointer along the Y axis.
     * @param {?=} delta Direction in which the user is moving their pointer.
     * @return {?}
     */
    DropListRef.prototype._getItemIndexFromPointerPosition = /**
     * Gets the index of an item in the drop container, based on the position of the user's pointer.
     * @private
     * @param {?} item Item that is being sorted.
     * @param {?} pointerX Position of the user's pointer along the X axis.
     * @param {?} pointerY Position of the user's pointer along the Y axis.
     * @param {?=} delta Direction in which the user is moving their pointer.
     * @return {?}
     */
    function (item, pointerX, pointerY, delta) {
        var _this = this;
        /** @type {?} */
        var isHorizontal = this._orientation === 'horizontal';
        return findIndex(this._positionCache.items, function (_a, _, array) {
            var drag = _a.drag, clientRect = _a.clientRect;
            if (drag === item) {
                // If there's only one item left in the container, it must be
                // the dragged item itself so we use it as a reference.
                return array.length < 2;
            }
            if (delta) {
                /** @type {?} */
                var direction = isHorizontal ? delta.x : delta.y;
                // If the user is still hovering over the same item as last time, and they didn't change
                // the direction in which they're dragging, we don't consider it a direction swap.
                if (drag === _this._previousSwap.drag && direction === _this._previousSwap.delta) {
                    return false;
                }
            }
            return isHorizontal ?
                // Round these down since most browsers report client rects with
                // sub-pixel precision, whereas the pointer coordinates are rounded to pixels.
                pointerX >= Math.floor(clientRect.left) && pointerX <= Math.floor(clientRect.right) :
                pointerY >= Math.floor(clientRect.top) && pointerY <= Math.floor(clientRect.bottom);
        });
    };
    /**
     * Checks whether the user's pointer is positioned over the container.
     * @param x Pointer position along the X axis.
     * @param y Pointer position along the Y axis.
     */
    /**
     * Checks whether the user's pointer is positioned over the container.
     * @param {?} x Pointer position along the X axis.
     * @param {?} y Pointer position along the Y axis.
     * @return {?}
     */
    DropListRef.prototype._isOverContainer = /**
     * Checks whether the user's pointer is positioned over the container.
     * @param {?} x Pointer position along the X axis.
     * @param {?} y Pointer position along the Y axis.
     * @return {?}
     */
    function (x, y) {
        return isInsideClientRect(this._positionCache.self, x, y);
    };
    /**
     * Figures out whether an item should be moved into a sibling
     * drop container, based on its current position.
     * @param item Drag item that is being moved.
     * @param x Position of the item along the X axis.
     * @param y Position of the item along the Y axis.
     */
    /**
     * Figures out whether an item should be moved into a sibling
     * drop container, based on its current position.
     * @param {?} item Drag item that is being moved.
     * @param {?} x Position of the item along the X axis.
     * @param {?} y Position of the item along the Y axis.
     * @return {?}
     */
    DropListRef.prototype._getSiblingContainerFromPosition = /**
     * Figures out whether an item should be moved into a sibling
     * drop container, based on its current position.
     * @param {?} item Drag item that is being moved.
     * @param {?} x Position of the item along the X axis.
     * @param {?} y Position of the item along the Y axis.
     * @return {?}
     */
    function (item, x, y) {
        /** @type {?} */
        var results = this._positionCache.siblings.filter(function (sibling) {
            return isInsideClientRect(sibling.clientRect, x, y);
        });
        // No drop containers are intersecting with the pointer.
        if (!results.length) {
            return null;
        }
        /** @type {?} */
        var elementFromPoint = this._document.elementFromPoint(x, y);
        // If there's no element at the pointer position, then
        // the client rect is probably scrolled out of the view.
        if (!elementFromPoint) {
            return null;
        }
        // The `ClientRect`, that we're using to find the container over which the user is
        // hovering, doesn't give us any information on whether the element has been scrolled
        // out of the view or whether it's overlapping with other containers. This means that
        // we could end up transferring the item into a container that's invisible or is positioned
        // below another one. We use the result from `elementFromPoint` to get the top-most element
        // at the pointer position and to find whether it's one of the intersecting drop containers.
        /** @type {?} */
        var result = results.find(function (sibling) {
            /** @type {?} */
            var element = sibling.drop.element.nativeElement;
            return element === elementFromPoint || element.contains(elementFromPoint);
        });
        return result && result.drop.enterPredicate(item, result.drop) ? result.drop : null;
    };
    return DropListRef;
}());
/**
 * Updates the top/left positions of a `ClientRect`, as well as their bottom/right counterparts.
 * @param {?} clientRect `ClientRect` that should be updated.
 * @param {?} top Amount to add to the `top` position.
 * @param {?} left Amount to add to the `left` position.
 * @return {?}
 */
function adjustClientRect(clientRect, top, left) {
    clientRect.top += top;
    clientRect.bottom = clientRect.top + clientRect.height;
    clientRect.left += left;
    clientRect.right = clientRect.left + clientRect.width;
}
/**
 * Finds the index of an item that matches a predicate function. Used as an equivalent
 * of `Array.prototype.find` which isn't part of the standard Google typings.
 * @template T
 * @param {?} array Array in which to look for matches.
 * @param {?} predicate Function used to determine whether an item is a match.
 * @return {?}
 */
function findIndex(array, predicate) {
    for (var i = 0; i < array.length; i++) {
        if (predicate(array[i], i, array)) {
            return i;
        }
    }
    return -1;
}
/**
 * Checks whether some coordinates are within a `ClientRect`.
 * @param {?} clientRect ClientRect that is being checked.
 * @param {?} x Coordinates along the X axis.
 * @param {?} y Coordinates along the Y axis.
 * @return {?}
 */
function isInsideClientRect(clientRect, x, y) {
    var top = clientRect.top, bottom = clientRect.bottom, left = clientRect.left, right = clientRect.right;
    return y >= top && y <= bottom && x >= left && x <= right;
}

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Counter used to generate unique ids for drop zones.
 * @type {?}
 */
var _uniqueIdCounter$1 = 0;
var ɵ0 = undefined;
// @breaking-change 8.0.0 `CdkDropList` implements `CdkDropListContainer` for backwards
// compatiblity. The implements clause, as well as all the methods that it enforces can
// be removed when `CdkDropListContainer` is deleted.
/**
 * Container that wraps a set of draggable items.
 * @template T
 */
var CdkDropList = /** @class */ (function () {
    function CdkDropList(element, dragDropRegistry, _changeDetectorRef, dir, _group, 
    // @breaking-change 8.0.0 `_document` parameter to be made required.
    _document) {
        var _this = this;
        this.element = element;
        this._changeDetectorRef = _changeDetectorRef;
        this._group = _group;
        /**
         * Other draggable containers that this container is connected to and into which the
         * container's items can be transferred. Can either be references to other drop containers,
         * or their unique IDs.
         */
        this.connectedTo = [];
        /**
         * Direction in which the list is oriented.
         */
        this.orientation = 'vertical';
        /**
         * Unique ID for the drop zone. Can be used as a reference
         * in the `connectedTo` of another `CdkDropList`.
         */
        this.id = "cdk-drop-list-" + _uniqueIdCounter$1++;
        this._disabled = false;
        /**
         * Function that is used to determine whether an item
         * is allowed to be moved into a drop container.
         */
        this.enterPredicate = function () { return true; };
        /**
         * Emits when the user drops an item inside the container.
         */
        this.dropped = new core.EventEmitter();
        /**
         * Emits when the user has moved a new drag item into this container.
         */
        this.entered = new core.EventEmitter();
        /**
         * Emits when the user removes an item from the container
         * by dragging it into another container.
         */
        this.exited = new core.EventEmitter();
        /**
         * Emits as the user is swapping items while actively dragging.
         */
        this.sorted = new core.EventEmitter();
        // @breaking-change 8.0.0 Remove || once `_document` parameter is required.
        /** @type {?} */
        var ref = this._dropListRef = new DropListRef(element, dragDropRegistry, _document || document, dir);
        ref.data = this;
        ref.enterPredicate = function (drag, drop) {
            return _this.enterPredicate(drag.data, drop.data);
        };
        this._syncInputs(ref);
        this._proxyEvents(ref);
        CdkDropList._dropLists.push(this);
        if (_group) {
            _group._items.add(this);
        }
    }
    Object.defineProperty(CdkDropList.prototype, "disabled", {
        /** Whether starting a dragging sequence from this container is disabled. */
        get: /**
         * Whether starting a dragging sequence from this container is disabled.
         * @return {?}
         */
        function () {
            return this._disabled || (!!this._group && this._group.disabled);
        },
        set: /**
         * @param {?} value
         * @return {?}
         */
        function (value) {
            this._disabled = coercion.coerceBooleanProperty(value);
        },
        enumerable: true,
        configurable: true
    });
    /**
     * @return {?}
     */
    CdkDropList.prototype.ngOnDestroy = /**
     * @return {?}
     */
    function () {
        /** @type {?} */
        var index = CdkDropList._dropLists.indexOf(this);
        this._dropListRef.dispose();
        if (index > -1) {
            CdkDropList._dropLists.splice(index, 1);
        }
        if (this._group) {
            this._group._items.delete(this);
        }
    };
    /** Starts dragging an item. */
    /**
     * Starts dragging an item.
     * @return {?}
     */
    CdkDropList.prototype.start = /**
     * Starts dragging an item.
     * @return {?}
     */
    function () {
        this._dropListRef.start();
    };
    /**
     * Drops an item into this container.
     * @param item Item being dropped into the container.
     * @param currentIndex Index at which the item should be inserted.
     * @param previousContainer Container from which the item got dragged in.
     * @param isPointerOverContainer Whether the user's pointer was over the
     *    container when the item was dropped.
     */
    /**
     * Drops an item into this container.
     * @param {?} item Item being dropped into the container.
     * @param {?} currentIndex Index at which the item should be inserted.
     * @param {?} previousContainer Container from which the item got dragged in.
     * @param {?} isPointerOverContainer Whether the user's pointer was over the
     *    container when the item was dropped.
     * @return {?}
     */
    CdkDropList.prototype.drop = /**
     * Drops an item into this container.
     * @param {?} item Item being dropped into the container.
     * @param {?} currentIndex Index at which the item should be inserted.
     * @param {?} previousContainer Container from which the item got dragged in.
     * @param {?} isPointerOverContainer Whether the user's pointer was over the
     *    container when the item was dropped.
     * @return {?}
     */
    function (item, currentIndex, previousContainer, isPointerOverContainer) {
        this._dropListRef.drop(item._dragRef, currentIndex, ((/** @type {?} */ (previousContainer)))._dropListRef, isPointerOverContainer);
    };
    /**
     * Emits an event to indicate that the user moved an item into the container.
     * @param item Item that was moved into the container.
     * @param pointerX Position of the item along the X axis.
     * @param pointerY Position of the item along the Y axis.
     */
    /**
     * Emits an event to indicate that the user moved an item into the container.
     * @param {?} item Item that was moved into the container.
     * @param {?} pointerX Position of the item along the X axis.
     * @param {?} pointerY Position of the item along the Y axis.
     * @return {?}
     */
    CdkDropList.prototype.enter = /**
     * Emits an event to indicate that the user moved an item into the container.
     * @param {?} item Item that was moved into the container.
     * @param {?} pointerX Position of the item along the X axis.
     * @param {?} pointerY Position of the item along the Y axis.
     * @return {?}
     */
    function (item, pointerX, pointerY) {
        this._dropListRef.enter(item._dragRef, pointerX, pointerY);
    };
    /**
     * Removes an item from the container after it was dragged into another container by the user.
     * @param item Item that was dragged out.
     */
    /**
     * Removes an item from the container after it was dragged into another container by the user.
     * @param {?} item Item that was dragged out.
     * @return {?}
     */
    CdkDropList.prototype.exit = /**
     * Removes an item from the container after it was dragged into another container by the user.
     * @param {?} item Item that was dragged out.
     * @return {?}
     */
    function (item) {
        this._dropListRef.exit(item._dragRef);
    };
    /**
     * Figures out the index of an item in the container.
     * @param item Item whose index should be determined.
     */
    /**
     * Figures out the index of an item in the container.
     * @param {?} item Item whose index should be determined.
     * @return {?}
     */
    CdkDropList.prototype.getItemIndex = /**
     * Figures out the index of an item in the container.
     * @param {?} item Item whose index should be determined.
     * @return {?}
     */
    function (item) {
        return this._dropListRef.getItemIndex(item._dragRef);
    };
    /**
     * Sorts an item inside the container based on its position.
     * @param item Item to be sorted.
     * @param pointerX Position of the item along the X axis.
     * @param pointerY Position of the item along the Y axis.
     * @param pointerDelta Direction in which the pointer is moving along each axis.
     */
    /**
     * Sorts an item inside the container based on its position.
     * @param {?} item Item to be sorted.
     * @param {?} pointerX Position of the item along the X axis.
     * @param {?} pointerY Position of the item along the Y axis.
     * @param {?} pointerDelta Direction in which the pointer is moving along each axis.
     * @return {?}
     */
    CdkDropList.prototype._sortItem = /**
     * Sorts an item inside the container based on its position.
     * @param {?} item Item to be sorted.
     * @param {?} pointerX Position of the item along the X axis.
     * @param {?} pointerY Position of the item along the Y axis.
     * @param {?} pointerDelta Direction in which the pointer is moving along each axis.
     * @return {?}
     */
    function (item, pointerX, pointerY, pointerDelta) {
        return this._dropListRef._sortItem(item._dragRef, pointerX, pointerY, pointerDelta);
    };
    /**
     * Figures out whether an item should be moved into a sibling
     * drop container, based on its current position.
     * @param item Drag item that is being moved.
     * @param x Position of the item along the X axis.
     * @param y Position of the item along the Y axis.
     */
    /**
     * Figures out whether an item should be moved into a sibling
     * drop container, based on its current position.
     * @param {?} item Drag item that is being moved.
     * @param {?} x Position of the item along the X axis.
     * @param {?} y Position of the item along the Y axis.
     * @return {?}
     */
    CdkDropList.prototype._getSiblingContainerFromPosition = /**
     * Figures out whether an item should be moved into a sibling
     * drop container, based on its current position.
     * @param {?} item Drag item that is being moved.
     * @param {?} x Position of the item along the X axis.
     * @param {?} y Position of the item along the Y axis.
     * @return {?}
     */
    function (item, x, y) {
        /** @type {?} */
        var result = this._dropListRef._getSiblingContainerFromPosition(item._dragRef, x, y);
        return result ? result.data : null;
    };
    /**
     * Checks whether the user's pointer is positioned over the container.
     * @param x Pointer position along the X axis.
     * @param y Pointer position along the Y axis.
     */
    /**
     * Checks whether the user's pointer is positioned over the container.
     * @param {?} x Pointer position along the X axis.
     * @param {?} y Pointer position along the Y axis.
     * @return {?}
     */
    CdkDropList.prototype._isOverContainer = /**
     * Checks whether the user's pointer is positioned over the container.
     * @param {?} x Pointer position along the X axis.
     * @param {?} y Pointer position along the Y axis.
     * @return {?}
     */
    function (x, y) {
        return this._dropListRef._isOverContainer(x, y);
    };
    /** Syncs the inputs of the CdkDropList with the options of the underlying DropListRef. */
    /**
     * Syncs the inputs of the CdkDropList with the options of the underlying DropListRef.
     * @private
     * @param {?} ref
     * @return {?}
     */
    CdkDropList.prototype._syncInputs = /**
     * Syncs the inputs of the CdkDropList with the options of the underlying DropListRef.
     * @private
     * @param {?} ref
     * @return {?}
     */
    function (ref) {
        var _this = this;
        ref.beforeStarted.subscribe(function () {
            /** @type {?} */
            var siblings = coercion.coerceArray(_this.connectedTo).map(function (drop) {
                return typeof drop === 'string' ?
                    (/** @type {?} */ (CdkDropList._dropLists.find(function (list) { return list.id === drop; }))) : drop;
            });
            if (_this._group) {
                _this._group._items.forEach(function (drop) {
                    if (siblings.indexOf(drop) === -1) {
                        siblings.push(drop);
                    }
                });
            }
            ref.lockAxis = _this.lockAxis;
            ref
                .connectedTo(siblings.filter(function (drop) { return drop && drop !== _this; }).map(function (list) { return list._dropListRef; }))
                .withOrientation(_this.orientation)
                .withItems(_this._draggables.map(function (drag) { return drag._dragRef; }));
        });
    };
    /**
     * Proxies the events from a DropListRef to events that
     * match the interfaces of the CdkDropList outputs.
     */
    /**
     * Proxies the events from a DropListRef to events that
     * match the interfaces of the CdkDropList outputs.
     * @private
     * @param {?} ref
     * @return {?}
     */
    CdkDropList.prototype._proxyEvents = /**
     * Proxies the events from a DropListRef to events that
     * match the interfaces of the CdkDropList outputs.
     * @private
     * @param {?} ref
     * @return {?}
     */
    function (ref) {
        var _this = this;
        ref.beforeStarted.subscribe(function () {
            _this._changeDetectorRef.markForCheck();
        });
        ref.entered.subscribe(function (event) {
            _this.entered.emit({
                container: _this,
                item: event.item.data
            });
        });
        ref.exited.subscribe(function (event) {
            _this.exited.emit({
                container: _this,
                item: event.item.data
            });
        });
        ref.sorted.subscribe(function (event) {
            _this.sorted.emit({
                previousIndex: event.previousIndex,
                currentIndex: event.currentIndex,
                container: _this,
                item: event.item.data
            });
        });
        ref.dropped.subscribe(function (event) {
            _this.dropped.emit({
                previousIndex: event.previousIndex,
                currentIndex: event.currentIndex,
                previousContainer: event.previousContainer.data,
                container: event.container.data,
                item: event.item.data,
                isPointerOverContainer: event.isPointerOverContainer
            });
        });
    };
    /**
     * Keeps track of the drop lists that are currently on the page.
     */
    CdkDropList._dropLists = [];
    CdkDropList.decorators = [
        { type: core.Directive, args: [{
                    selector: '[cdkDropList], cdk-drop-list',
                    exportAs: 'cdkDropList',
                    providers: [
                        // Prevent child drop lists from picking up the same group as their parent.
                        { provide: CdkDropListGroup, useValue: ɵ0 },
                        { provide: CDK_DROP_LIST_CONTAINER, useExisting: CdkDropList },
                    ],
                    host: {
                        'class': 'cdk-drop-list',
                        '[id]': 'id',
                        '[class.cdk-drop-list-dragging]': '_dropListRef.isDragging()',
                        '[class.cdk-drop-list-receiving]': '_dropListRef.isReceiving()',
                    }
                },] },
    ];
    /** @nocollapse */
    CdkDropList.ctorParameters = function () { return [
        { type: core.ElementRef },
        { type: DragDropRegistry },
        { type: core.ChangeDetectorRef },
        { type: bidi.Directionality, decorators: [{ type: core.Optional }] },
        { type: CdkDropListGroup, decorators: [{ type: core.Optional }, { type: core.SkipSelf }] },
        { type: undefined, decorators: [{ type: core.Optional }, { type: core.Inject, args: [common.DOCUMENT,] }] }
    ]; };
    CdkDropList.propDecorators = {
        _draggables: [{ type: core.ContentChildren, args: [core.forwardRef(function () { return CdkDrag; }),] }],
        connectedTo: [{ type: core.Input, args: ['cdkDropListConnectedTo',] }],
        data: [{ type: core.Input, args: ['cdkDropListData',] }],
        orientation: [{ type: core.Input, args: ['cdkDropListOrientation',] }],
        id: [{ type: core.Input }],
        lockAxis: [{ type: core.Input, args: ['cdkDropListLockAxis',] }],
        disabled: [{ type: core.Input, args: ['cdkDropListDisabled',] }],
        enterPredicate: [{ type: core.Input, args: ['cdkDropListEnterPredicate',] }],
        dropped: [{ type: core.Output, args: ['cdkDropListDropped',] }],
        entered: [{ type: core.Output, args: ['cdkDropListEntered',] }],
        exited: [{ type: core.Output, args: ['cdkDropListExited',] }],
        sorted: [{ type: core.Output, args: ['cdkDropListSorted',] }]
    };
    return CdkDropList;
}());

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
var DragDropModule = /** @class */ (function () {
    function DragDropModule() {
    }
    DragDropModule.decorators = [
        { type: core.NgModule, args: [{
                    declarations: [
                        CdkDropList,
                        CdkDropListGroup,
                        CdkDrag,
                        CdkDragHandle,
                        CdkDragPreview,
                        CdkDragPlaceholder,
                    ],
                    exports: [
                        CdkDropList,
                        CdkDropListGroup,
                        CdkDrag,
                        CdkDragHandle,
                        CdkDragPreview,
                        CdkDragPlaceholder,
                    ],
                },] },
    ];
    return DragDropModule;
}());

exports.CDK_DROP_LIST = CDK_DROP_LIST;
exports.CDK_DROP_LIST_CONTAINER = CDK_DROP_LIST_CONTAINER;
exports.moveItemInArray = moveItemInArray;
exports.transferArrayItem = transferArrayItem;
exports.copyArrayItem = copyArrayItem;
exports.DragDropModule = DragDropModule;
exports.DragDropRegistry = DragDropRegistry;
exports.CdkDropList = CdkDropList;
exports.CdkDropListGroup = CdkDropListGroup;
exports.CDK_DRAG_CONFIG_FACTORY = CDK_DRAG_CONFIG_FACTORY;
exports.CDK_DRAG_CONFIG = CDK_DRAG_CONFIG;
exports.CdkDrag = CdkDrag;
exports.CdkDragHandle = CdkDragHandle;
exports.CdkDragPreview = CdkDragPreview;
exports.CdkDragPlaceholder = CdkDragPlaceholder;
exports.ɵa = CDK_DRAG_PARENT;

Object.defineProperty(exports, '__esModule', { value: true });

})));
//# sourceMappingURL=cdk-drag-drop.umd.js.map
