text: /**
   * @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/cdk/platform'), require('@angular/cdk/coercion'), require('rxjs'), require('@angular/core'), require('@angular/common'), require('@angular/cdk/scrolling'), require('@angular/cdk/bidi'), require('rxjs/operators')) :
  	typeof define === 'function' && define.amd ? define('@angular/cdk/drag-drop', ['exports', '@angular/cdk/platform', '@angular/cdk/coercion', 'rxjs', '@angular/core', '@angular/common', '@angular/cdk/scrolling', '@angular/cdk/bidi', 'rxjs/operators'], factory) :
  	(factory((global.ng = global.ng || {}, global.ng.cdk = global.ng.cdk || {}, global.ng.cdk.dragDrop = {}),global.ng.cdk.platform,global.ng.cdk.coercion,global.rxjs,global.ng.core,global.ng.common,global.ng.cdk.scrolling,global.ng.cdk.bidi,global.rxjs.operators));
  }(this, (function (exports,platform,coercion,rxjs,core,common,scrolling,bidi,operators) { 'use strict';
  
  /**
   * @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
   */
  
  /**
   * 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, _config, _document, _ngZone, _viewportRuler, _dragDropRegistry) {
          var _this = this;
          this._config = _config;
          this._document = _document;
          this._ngZone = _ngZone;
          this._viewportRuler = _viewportRuler;
          this._dragDropRegistry = _dragDropRegistry;
          /**
           * 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;
          /**
           * Whether the native dragging interactions have been enabled on the root element.
           */
          this._nativeInteractionsEnabled = true;
          /**
           * Elements that can be used to drag the draggable item.
           */
          this._handles = [];
          /**
           * Registered handles that are currently disabled.
           */
          this._disabledHandles = new Set();
          /**
           * Layout direction of the item.
           */
          this._direction = 'ltr';
          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 = new rxjs.Observable(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 target = event.target;
                      return !!target && (target === handle || handle.contains((/** @type {?} */ (target))));
                  });
                  if (targetHandle && !_this._disabledHandles.has(targetHandle) && !_this.disabled) {
                      _this._initializeDragSequence(targetHandle, 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. Note that we apply our own
                  // transform before the user's, because things like rotation can affect which direction
                  // the element will be translated towards.
                  _this._rootElement.style.transform = _this._initialTransform ?
                      transform + ' ' + _this._initialTransform : 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) {
              /** @type {?} */
              var newValue = coercion.coerceBooleanProperty(value);
              if (newValue !== this._disabled) {
                  this._disabled = newValue;
                  this._toggleNativeDragInteractions();
              }
          },
          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) {
          (/** @type {?} */ (this))._handles = handles.map(function (handle) { return coercion.coerceElement(handle); });
          (/** @type {?} */ (this))._handles.forEach(function (handle) { return toggleNativeDragInteractions(handle, false); });
          (/** @type {?} */ (this))._toggleNativeDragInteractions();
          return (/** @type {?} */ (this));
      };
      /**
       * Registers the template that should be used for the drag preview.
       * @param template Template that from which to stamp out the preview.
       */
      /**
       * Registers the template that should be used for the drag preview.
       * @template THIS
       * @this {THIS}
       * @param {?} template Template that from which to stamp out the preview.
       * @return {THIS}
       */
      DragRef.prototype.withPreviewTemplate = /**
       * Registers the template that should be used for the drag preview.
       * @template THIS
       * @this {THIS}
       * @param {?} template Template that from which to stamp out the preview.
       * @return {THIS}
       */
      function (template) {
          (/** @type {?} */ (this))._previewTemplate = template;
          return (/** @type {?} */ (this));
      };
      /**
       * Registers the template that should be used for the drag placeholder.
       * @param template Template that from which to stamp out the placeholder.
       */
      /**
       * Registers the template that should be used for the drag placeholder.
       * @template THIS
       * @this {THIS}
       * @param {?} template Template that from which to stamp out the placeholder.
       * @return {THIS}
       */
      DragRef.prototype.withPlaceholderTemplate = /**
       * Registers the template that should be used for the drag placeholder.
       * @template THIS
       * @this {THIS}
       * @param {?} template Template that from which to stamp out the placeholder.
       * @return {THIS}
       */
      function (template) {
          (/** @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 = coercion.coerceElement(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))._initialTransform = undefined;
              (/** @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 ? coercion.coerceElement(boundaryElement) : null;
          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._disabledHandles.clear();
          this._dropContainer = undefined;
          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._initialTransform || '';
          this._activeTransform = { x: 0, y: 0 };
          this._passiveTransform = { x: 0, y: 0 };
      };
      /**
       * Sets a handle as disabled. While a handle is disabled, it'll capture and interrupt dragging.
       * @param handle Handle element that should be disabled.
       */
      /**
       * Sets a handle as disabled. While a handle is disabled, it'll capture and interrupt dragging.
       * @param {?} handle Handle element that should be disabled.
       * @return {?}
       */
      DragRef.prototype.disableHandle = /**
       * Sets a handle as disabled. While a handle is disabled, it'll capture and interrupt dragging.
       * @param {?} handle Handle element that should be disabled.
       * @return {?}
       */
      function (handle) {
          if (this._handles.indexOf(handle) > -1) {
              this._disabledHandles.add(handle);
          }
      };
      /**
       * Enables a handle, if it has been disabled.
       * @param handle Handle element to be enabled.
       */
      /**
       * Enables a handle, if it has been disabled.
       * @param {?} handle Handle element to be enabled.
       * @return {?}
       */
      DragRef.prototype.enableHandle = /**
       * Enables a handle, if it has been disabled.
       * @param {?} handle Handle element to be enabled.
       * @return {?}
       */
      function (handle) {
          this._disabledHandles.delete(handle);
      };
      /** Sets the layout direction of the draggable item. */
      /**
       * Sets the layout direction of the draggable item.
       * @template THIS
       * @this {THIS}
       * @param {?} direction
       * @return {THIS}
       */
      DragRef.prototype.withDirection = /**
       * Sets the layout direction of the draggable item.
       * @template THIS
       * @this {THIS}
       * @param {?} direction
       * @return {THIS}
       */
      function (direction) {
          (/** @type {?} */ (this))._direction = direction;
          return (/** @type {?} */ (this));
      };
      /** Sets the container that the item is part of. */
      /**
       * Sets the container that the item is part of.
       * @param {?} container
       * @return {?}
       */
      DragRef.prototype._withDropContainer = /**
       * Sets the container that the item is part of.
       * @param {?} container
       * @return {?}
       */
      function (container) {
          this._dropContainer = container;
      };
      /** 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 && this._previewTemplate.template ?
              { 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.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) ||
              this._initialContainer._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 && newContainer !== this._dropContainer) {
              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 previewConfig = this._previewTemplate;
          /** @type {?} */
          var previewTemplate = previewConfig ? previewConfig.template : null;
          /** @type {?} */
          var preview;
          if (previewTemplate) {
              /** @type {?} */
              var viewRef = (/** @type {?} */ (previewConfig)).viewContainer.createEmbeddedView(previewTemplate, (/** @type {?} */ (previewConfig)).context);
              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._direction);
          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 placeholderConfig = this._placeholderTemplate;
          /** @type {?} */
          var placeholderTemplate = placeholderConfig ? placeholderConfig.template : null;
          /** @type {?} */
          var placeholder;
          if (placeholderTemplate) {
              this._placeholderRef = (/** @type {?} */ (placeholderConfig)).viewContainer.createEmbeddedView(placeholderTemplate, (/** @type {?} */ (placeholderConfig)).context);
              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(point.x, minX, maxX);
              point.y = clamp(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 () {
          if (!this._rootElement || !this._handles) {
              return;
          }
          /** @type {?} */
          var shouldEnable = this.disabled || this._handles.length > 0;
          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(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
   */
  
  /**
   * 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$1(fromIndex, array.length - 1);
      /** @type {?} */
      var to = clamp$1(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$1(currentIndex, currentArray.length - 1);
      /** @type {?} */
      var to = clamp$1(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$1(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$1(value, max) {
      return Math.max(0, Math.min(max, value));
  }
  
  /**
   * @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) {
          this._dragDropRegistry = _dragDropRegistry;
          /**
           * 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 inside the container.
           */
          this._itemPositions = [];
          /**
           * 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 };
          /**
           * Drop lists that are connected to the current one.
           */
          this._siblings = [];
          /**
           * Direction in which the list is oriented.
           */
          this._orientation = 'vertical';
          /**
           * Connected siblings that currently have a dragged item.
           */
          this._activeSiblings = new Set();
          /**
           * Layout direction of the drop list.
           */
          this._direction = 'ltr';
          _dragDropRegistry.registerDropContainer(this);
          this._document = _document;
          this.element = element instanceof core.ElementRef ? element.nativeElement : element;
      }
      /** 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._activeSiblings.clear();
          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 () {
          var _this = this;
          this.beforeStarted.next();
          this._isDragging = true;
          this._activeDraggables = this._draggables.slice();
          this._cacheOwnPosition();
          this._cacheItemPositions();
          this._siblings.forEach(function (sibling) { return sibling._startReceiving(_this); });
      };
      /**
       * 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.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._cacheItemPositions();
      };
      /**
       * 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) {
          var _this = this;
          (/** @type {?} */ (this))._draggables = items.slice();
          items.forEach(function (item) { return item._withDropContainer((/** @type {?} */ (_this))); });
          return (/** @type {?} */ (this));
      };
      /** Sets the layout direction of the drop list. */
      /**
       * Sets the layout direction of the drop list.
       * @template THIS
       * @this {THIS}
       * @param {?} direction
       * @return {THIS}
       */
      DropListRef.prototype.withDirection = /**
       * Sets the layout direction of the drop list.
       * @template THIS
       * @this {THIS}
       * @param {?} direction
       * @return {THIS}
       */
      function (direction) {
          (/** @type {?} */ (this))._direction = direction;
          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._direction === 'rtl' ?
              this._itemPositions.slice().reverse() : this._itemPositions;
          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.size > 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._itemPositions;
          /** @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);
              }
          });
      };
      /** Caches the position of the drop list. */
      /**
       * Caches the position of the drop list.
       * @private
       * @return {?}
       */
      DropListRef.prototype._cacheOwnPosition = /**
       * Caches the position of the drop list.
       * @private
       * @return {?}
       */
      function () {
          this._clientRect = this.element.getBoundingClientRect();
      };
      /** Refreshes the position cache of the items and sibling containers. */
      /**
       * Refreshes the position cache of the items and sibling containers.
       * @private
       * @return {?}
       */
      DropListRef.prototype._cacheItemPositions = /**
       * Refreshes the position cache of the items and sibling containers.
       * @private
       * @return {?}
       */
      function () {
          var _this = this;
          /** @type {?} */
          var isHorizontal = this._orientation === 'horizontal';
          this._itemPositions = 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;
          });
      };
      /** 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 () {
          var _this = this;
          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._siblings.forEach(function (sibling) { return sibling._stopReceiving(_this); });
          this._activeDraggables = [];
          this._itemPositions = [];
          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._clientRect, 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._itemPositions, 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._clientRect, 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) {
          return this._siblings.find(function (sibling) { return sibling._canReceive(item, x, y); });
      };
      /**
       * Checks whether the drop list can receive the passed-in item.
       * @param item Item that is being dragged into the list.
       * @param x Position of the item along the X axis.
       * @param y Position of the item along the Y axis.
       */
      /**
       * Checks whether the drop list can receive the passed-in item.
       * @param {?} item Item that is being dragged into the list.
       * @param {?} x Position of the item along the X axis.
       * @param {?} y Position of the item along the Y axis.
       * @return {?}
       */
      DropListRef.prototype._canReceive = /**
       * Checks whether the drop list can receive the passed-in item.
       * @param {?} item Item that is being dragged into the list.
       * @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) {
          if (!this.enterPredicate(item, this) || !isInsideClientRect(this._clientRect, x, y)) {
              return false;
          }
          /** @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 false;
          }
          // 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.
          return elementFromPoint === this.element || this.element.contains(elementFromPoint);
      };
      /**
       * Called by one of the connected drop lists when a dragging sequence has started.
       * @param sibling Sibling in which dragging has started.
       */
      /**
       * Called by one of the connected drop lists when a dragging sequence has started.
       * @param {?} sibling Sibling in which dragging has started.
       * @return {?}
       */
      DropListRef.prototype._startReceiving = /**
       * Called by one of the connected drop lists when a dragging sequence has started.
       * @param {?} sibling Sibling in which dragging has started.
       * @return {?}
       */
      function (sibling) {
          /** @type {?} */
          var activeSiblings = this._activeSiblings;
          if (!activeSiblings.has(sibling)) {
              activeSiblings.add(sibling);
              this._cacheOwnPosition();
          }
      };
      /**
       * Called by a connected drop list when dragging has stopped.
       * @param sibling Sibling whose dragging has stopped.
       */
      /**
       * Called by a connected drop list when dragging has stopped.
       * @param {?} sibling Sibling whose dragging has stopped.
       * @return {?}
       */
      DropListRef.prototype._stopReceiving = /**
       * Called by a connected drop list when dragging has stopped.
       * @param {?} sibling Sibling whose dragging has stopped.
       * @return {?}
       */
      function (sibling) {
          this._activeSiblings.delete(sibling);
      };
      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
   */
  /**
   * 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
   */
  /**
   * Default configuration to be used when creating a `DragRef`.
   * @type {?}
   */
  var DEFAULT_CONFIG = {
      dragStartThreshold: 5,
      pointerDirectionChangeThreshold: 5
  };
  /**
   * Service that allows for drag-and-drop functionality to be attached to DOM elements.
   */
  var DragDrop = /** @class */ (function () {
      function DragDrop(_document, _ngZone, _viewportRuler, _dragDropRegistry) {
          this._document = _document;
          this._ngZone = _ngZone;
          this._viewportRuler = _viewportRuler;
          this._dragDropRegistry = _dragDropRegistry;
      }
      /**
       * Turns an element into a draggable item.
       * @param element Element to which to attach the dragging functionality.
       * @param config Object used to configure the dragging behavior.
       */
      /**
       * Turns an element into a draggable item.
       * @template T
       * @param {?} element Element to which to attach the dragging functionality.
       * @param {?=} config Object used to configure the dragging behavior.
       * @return {?}
       */
      DragDrop.prototype.createDrag = /**
       * Turns an element into a draggable item.
       * @template T
       * @param {?} element Element to which to attach the dragging functionality.
       * @param {?=} config Object used to configure the dragging behavior.
       * @return {?}
       */
      function (element, config) {
          if (config === void 0) { config = DEFAULT_CONFIG; }
          return new DragRef(element, config, this._document, this._ngZone, this._viewportRuler, this._dragDropRegistry);
      };
      /**
       * Turns an element into a drop list.
       * @param element Element to which to attach the drop list functionality.
       */
      /**
       * Turns an element into a drop list.
       * @template T
       * @param {?} element Element to which to attach the drop list functionality.
       * @return {?}
       */
      DragDrop.prototype.createDropList = /**
       * Turns an element into a drop list.
       * @template T
       * @param {?} element Element to which to attach the drop list functionality.
       * @return {?}
       */
      function (element) {
          return new DropListRef(element, this._dragDropRegistry, this._document);
      };
      DragDrop.decorators = [
          { type: core.Injectable, args: [{ providedIn: 'root' },] },
      ];
      /** @nocollapse */
      DragDrop.ctorParameters = function () { return [
          { type: undefined, decorators: [{ type: core.Inject, args: [common.DOCUMENT,] }] },
          { type: core.NgZone },
          { type: scrolling.ViewportRuler },
          { type: DragDropRegistry }
      ]; };
      /** @nocollapse */ DragDrop.ngInjectableDef = core.defineInjectable({ factory: function DragDrop_Factory() { return new DragDrop(core.inject(common.DOCUMENT), core.inject(core.NgZone), core.inject(scrolling.ViewportRuler), core.inject(DragDropRegistry)); }, token: DragDrop, providedIn: "root" });
      return DragDrop;
  }());
  
  /**
   * @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
   */
  /**
   * 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
   */
  /**
   * Handle that can be used to drag and CdkDrag instance.
   */
  var CdkDragHandle = /** @class */ (function () {
      function CdkDragHandle(element, parentDrag) {
          this.element = element;
          /**
           * Emits when the state of the handle has changed.
           */
          this._stateChanges = new rxjs.Subject();
          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);
              this._stateChanges.next(this);
          },
          enumerable: true,
          configurable: true
      });
      /**
       * @return {?}
       */
      CdkDragHandle.prototype.ngOnDestroy = /**
       * @return {?}
       */
      function () {
          this._stateChanges.complete();
      };
      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
   */
  /**
   * 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, 
      /**
       * @deprecated `viewportRuler`, `dragDropRegistry` and `_changeDetectorRef` parameters
       * to be removed. Also `dragDrop` parameter to be made required.
       * @breaking-change 8.0.0.
       */
      dragDrop, _changeDetectorRef) {
          var _this = this;
          this.element = element;
          this.dropContainer = dropContainer;
          this._document = _document;
          this._ngZone = _ngZone;
          this._viewContainerRef = _viewContainerRef;
          this._dir = _dir;
          this._changeDetectorRef = _changeDetectorRef;
          this._destroyed = new rxjs.Subject();
          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 = new rxjs.Observable(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();
              };
          });
          // @breaking-change 8.0.0 Remove null check once the paramter is made required.
          if (dragDrop) {
              this._dragRef = dragDrop.createDrag(element, config);
          }
          else {
              this._dragRef = new DragRef(element, config, _document, _ngZone, viewportRuler, dragDropRegistry);
          }
          this._dragRef.data = this;
          this._syncInputs(this._dragRef);
          this._handleEvents(this._dragRef);
      }
      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);
              this._dragRef.disabled = this._disabled;
          },
          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._ngZone.onStable.asObservable()
              .pipe(operators.take(1), operators.takeUntil(this._destroyed))
              .subscribe(function () {
              _this._updateRootElement();
              // Listen for any newly-added handles.
              _this._handles.changes.pipe(operators.startWith(_this._handles), 
              // Sync the new handles with the DragRef.
              operators.tap(function (handles) {
                  /** @type {?} */
                  var childHandleElements = handles
                      .filter(function (handle) { return handle._parentDrag === _this; })
                      .map(function (handle) { return handle.element; });
                  _this._dragRef.withHandles(childHandleElements);
              }), 
              // Listen if the state of any of the handles changes.
              operators.switchMap(function (handles) {
                  return rxjs.merge.apply(void 0, handles.map(function (item) { return item._stateChanges; }));
              }), operators.takeUntil(_this._destroyed)).subscribe(function (handleInstance) {
                  // Enabled/disable the handle that changed in the DragRef.
                  /** @type {?} */
                  var dragRef = _this._dragRef;
                  /** @type {?} */
                  var handle = handleInstance.element.nativeElement;
                  handleInstance.disabled ? dragRef.disableHandle(handle) : dragRef.enableHandle(handle);
              });
          });
      };
      /**
       * @param {?} changes
       * @return {?}
       */
      CdkDrag.prototype.ngOnChanges = /**
       * @param {?} changes
       * @return {?}
       */
      function (changes) {
          /** @type {?} */
          var rootSelectorChange = changes.rootElementSelector;
          // We don't have to react to the first change since it's being
          // handled in `ngAfterViewInit` where it needs to be deferred.
          if (rootSelectorChange && !rootSelectorChange.firstChange) {
              this._updateRootElement();
          }
      };
      /**
       * @return {?}
       */
      CdkDrag.prototype.ngOnDestroy = /**
       * @return {?}
       */
      function () {
          this._destroyed.next();
          this._destroyed.complete();
          this._dragRef.dispose();
      };
      /** Syncs the root element with the `DragRef`. */
      /**
       * Syncs the root element with the `DragRef`.
       * @private
       * @return {?}
       */
      CdkDrag.prototype._updateRootElement = /**
       * Syncs the root element with the `DragRef`.
       * @private
       * @return {?}
       */
      function () {
          /** @type {?} */
          var element = this.element.nativeElement;
          /** @type {?} */
          var rootElement = this.rootElementSelector ?
              getClosestMatchingAncestor(element, this.rootElementSelector) : element;
          if (rootElement && 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 || 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;
      };
      /** Syncs the inputs of the CdkDrag with the options of the underlying DragRef. */
      /**
       * Syncs the inputs of the CdkDrag with the options of the underlying DragRef.
       * @private
       * @param {?} ref
       * @return {?}
       */
      CdkDrag.prototype._syncInputs = /**
       * Syncs the inputs of the CdkDrag with the options of the underlying DragRef.
       * @private
       * @param {?} ref
       * @return {?}
       */
      function (ref) {
          var _this = this;
          ref.beforeStarted.subscribe(function () {
              if (!ref.isDragging()) {
                  /** @type {?} */
                  var dir = _this._dir;
                  /** @type {?} */
                  var placeholder = _this._placeholderTemplate ? {
                      template: _this._placeholderTemplate.templateRef,
                      context: _this._placeholderTemplate.data,
                      viewContainer: _this._viewContainerRef
                  } : null;
                  /** @type {?} */
                  var preview = _this._previewTemplate ? {
                      template: _this._previewTemplate.templateRef,
                      context: _this._previewTemplate.data,
                      viewContainer: _this._viewContainerRef
                  } : null;
                  ref.disabled = _this.disabled;
                  ref.lockAxis = _this.lockAxis;
                  ref
                      .withBoundaryElement(_this._getBoundaryElement())
                      .withPlaceholderTemplate(placeholder)
                      .withPreviewTemplate(preview);
                  if (dir) {
                      ref.withDirection(dir.value);
                  }
              }
          });
      };
      /** Handles the events from the underlying `DragRef`. */
      /**
       * Handles the events from the underlying `DragRef`.
       * @private
       * @param {?} ref
       * @return {?}
       */
      CdkDrag.prototype._handleEvents = /**
       * Handles the events from the underlying `DragRef`.
       * @private
       * @param {?} ref
       * @return {?}
       */
      function (ref) {
          var _this = this;
          ref.started.subscribe(function () {
              _this.started.emit({ source: _this });
              // Since all of these events run outside of change detection,
              // we need to ensure that everything is marked correctly.
              if (_this._changeDetectorRef) {
                  // @breaking-change 8.0.0 Remove null check for _changeDetectorRef
                  _this._changeDetectorRef.markForCheck();
              }
          });
          ref.released.subscribe(function () {
              _this.released.emit({ source: _this });
          });
          ref.ended.subscribe(function () {
              _this.ended.emit({ source: _this });
              // Since all of these events run outside of change detection,
              // we need to ensure that everything is marked correctly.
              if (_this._changeDetectorRef) {
                  // @breaking-change 8.0.0 Remove null check for _changeDetectorRef
                  _this._changeDetectorRef.markForCheck();
              }
          });
          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-disabled]': 'disabled',
                          '[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 }] },
          { type: DragDrop },
          { type: core.ChangeDetectorRef }
      ]; };
      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 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, _document, 
      /**
       * @deprecated `dragDropRegistry` and `_document` parameters to be removed.
       * Also `dragDrop` parameter to be made required.
       * @breaking-change 8.0.0.
       */
      dragDrop) {
          var _this = this;
          this.element = element;
          this._changeDetectorRef = _changeDetectorRef;
          this._dir = _dir;
          this._group = _group;
          /**
           * Emits when the list has been destroyed.
           */
          this._destroyed = new rxjs.Subject();
          /**
           * 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 null check once `dragDrop` parameter is made required.
          if (dragDrop) {
              this._dropListRef = dragDrop.createDropList(element);
          }
          else {
              this._dropListRef = new DropListRef(element, dragDropRegistry, _document || document);
          }
          this._dropListRef.data = this;
          this._dropListRef.enterPredicate = function (drag, drop) {
              return _this.enterPredicate(drag.data, drop.data);
          };
          this._syncInputs(this._dropListRef);
          this._handleEvents(this._dropListRef);
          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.ngAfterContentInit = /**
       * @return {?}
       */
      function () {
          var _this = this;
          this._draggables.changes
              .pipe(operators.startWith(this._draggables), operators.takeUntil(this._destroyed))
              .subscribe(function (items) {
              _this._dropListRef.withItems(items.map(function (drag) { return drag._dragRef; }));
          });
      };
      /**
       * @return {?}
       */
      CdkDropList.prototype.ngOnDestroy = /**
       * @return {?}
       */
      function () {
          /** @type {?} */
          var index = CdkDropList._dropLists.indexOf(this);
          if (index > -1) {
              CdkDropList._dropLists.splice(index, 1);
          }
          if (this._group) {
              this._group._items.delete(this);
          }
          this._dropListRef.dispose();
          this._destroyed.next();
          this._destroyed.complete();
      };
      /** 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;
          if (this._dir) {
              this._dir.change
                  .pipe(operators.startWith(this._dir.value), operators.takeUntil(this._destroyed))
                  .subscribe(function (value) { return ref.withDirection(value); });
          }
          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);
          });
      };
      /** Handles events from the underlying DropListRef. */
      /**
       * Handles events from the underlying DropListRef.
       * @private
       * @param {?} ref
       * @return {?}
       */
      CdkDropList.prototype._handleEvents = /**
       * Handles events from the underlying DropListRef.
       * @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
              });
              // Mark for check since all of these events run outside of change
              // detection and we're not guaranteed for something else to have triggered it.
              _this._changeDetectorRef.markForCheck();
          });
      };
      /**
       * 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-disabled]': 'disabled',
                          '[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,] }] },
          { type: DragDrop }
      ]; };
      CdkDropList.propDecorators = {
          _draggables: [{ type: core.ContentChildren, args: [core.forwardRef(function () { return CdkDrag; }), {
                          // Explicitly set to false since some of the logic below makes assumptions about it.
                          // The `.withItems` call below should be updated if we ever need to switch this to `true`.
                          descendants: false
                      },] }],
          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,
                      ],
                      providers: [
                          DragDrop,
                      ]
                  },] },
      ];
      return DragDropModule;
  }());
  
  exports.DragDrop = DragDrop;
  exports.DragRef = DragRef;
  exports.DropListRef = DropListRef;
  exports.CdkDropList = CdkDropList;
  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.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.ɵb = CDK_DRAG_PARENT;
  
  Object.defineProperty(exports, '__esModule', { value: true });
  
  })));
  //# sourceMappingURL=cdk-drag-drop.umd.js.map
  