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✏️ Editing: packery.js

/*!
 * Packery layout mode PACKAGED v2.0.1
 * sub-classes Packery
 */

/**
 * Rect
 * low-level utility class for basic geometry
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /* globals define, module */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'packery/js/rect',factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory();
  } else {
    // browser global
    window.Packery = window.Packery || {};
    window.Packery.Rect = factory();
  }

}( window, function factory() {

// -------------------------- Rect -------------------------- //

function Rect( props ) {
  // extend properties from defaults
  for ( var prop in Rect.defaults ) {
    this[ prop ] = Rect.defaults[ prop ];
  }

for ( prop in props ) {
    this[ prop ] = props[ prop ];
  }

}

Rect.defaults = {
  x: 0,
  y: 0,
  width: 0,
  height: 0
};

var proto = Rect.prototype;

/**
 * Determines whether or not this rectangle wholly encloses another rectangle or point.
 * @param {Rect} rect
 * @returns {Boolean}
**/
proto.contains = function( rect ) {
  // points don't have width or height
  var otherWidth = rect.width || 0;
  var otherHeight = rect.height || 0;
  return this.x <= rect.x &&
    this.y <= rect.y &&
    this.x + this.width >= rect.x + otherWidth &&
    this.y + this.height >= rect.y + otherHeight;
};

/**
 * Determines whether or not the rectangle intersects with another.
 * @param {Rect} rect
 * @returns {Boolean}
**/
proto.overlaps = function( rect ) {
  var thisRight = this.x + this.width;
  var thisBottom = this.y + this.height;
  var rectRight = rect.x + rect.width;
  var rectBottom = rect.y + rect.height;

// http://stackoverflow.com/a/306332
  return this.x < rectRight &&
    thisRight > rect.x &&
    this.y < rectBottom &&
    thisBottom > rect.y;
};

/**
 * @param {Rect} rect - the overlapping rect
 * @returns {Array} freeRects - rects representing the area around the rect
**/
proto.getMaximalFreeRects = function( rect ) {

// if no intersection, return false
  if ( !this.overlaps( rect ) ) {
    return false;
  }

var freeRects = [];
  var freeRect;

var thisRight = this.x + this.width;
  var thisBottom = this.y + this.height;
  var rectRight = rect.x + rect.width;
  var rectBottom = rect.y + rect.height;

// top
  if ( this.y < rect.y ) {
    freeRect = new Rect({
      x: this.x,
      y: this.y,
      width: this.width,
      height: rect.y - this.y
    });
    freeRects.push( freeRect );
  }

// right
  if ( thisRight > rectRight ) {
    freeRect = new Rect({
      x: rectRight,
      y: this.y,
      width: thisRight - rectRight,
      height: this.height
    });
    freeRects.push( freeRect );
  }

// bottom
  if ( thisBottom > rectBottom ) {
    freeRect = new Rect({
      x: this.x,
      y: rectBottom,
      width: this.width,
      height: thisBottom - rectBottom
    });
    freeRects.push( freeRect );
  }

// left
  if ( this.x < rect.x ) {
    freeRect = new Rect({
      x: this.x,
      y: this.y,
      width: rect.x - this.x,
      height: this.height
    });
    freeRects.push( freeRect );
  }

return freeRects;
};

proto.canFit = function( rect ) {
  return this.width >= rect.width && this.height >= rect.height;
};

return Rect;

}));

/**
 * Packer
 * bin-packing algorithm
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /* globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'packery/js/packer',[ './rect' ], factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      require('./rect')
    );
  } else {
    // browser global
    var Packery = window.Packery = window.Packery || {};
    Packery.Packer = factory( Packery.Rect );
  }

}( window, function factory( Rect ) {

// -------------------------- Packer -------------------------- //

/**
 * @param {Number} width
 * @param {Number} height
 * @param {String} sortDirection
 *   topLeft for vertical, leftTop for horizontal
 */
function Packer( width, height, sortDirection ) {
  this.width = width || 0;
  this.height = height || 0;
  this.sortDirection = sortDirection || 'downwardLeftToRight';

this.reset();
}

var proto = Packer.prototype;

proto.reset = function() {
  this.spaces = [];

var initialSpace = new Rect({
    x: 0,
    y: 0,
    width: this.width,
    height: this.height
  });

this.spaces.push( initialSpace );
  // set sorter
  this.sorter = sorters[ this.sortDirection ] || sorters.downwardLeftToRight;
};

// change x and y of rect to fit with in Packer's available spaces
proto.pack = function( rect ) {
  for ( var i=0; i < this.spaces.length; i++ ) {
    var space = this.spaces[i];
    if ( space.canFit( rect ) ) {
      this.placeInSpace( rect, space );
      break;
    }
  }
};

proto.columnPack = function( rect ) {
  for ( var i=0; i < this.spaces.length; i++ ) {
    var space = this.spaces[i];
    var canFitInSpaceColumn = space.x <= rect.x &&
      space.x + space.width >= rect.x + rect.width &&
      space.height >= rect.height - 0.01; // fudge number for rounding error
    if ( canFitInSpaceColumn ) {
      rect.y = space.y;
      this.placed( rect );
      break;
    }
  }
};

proto.rowPack = function( rect ) {
  for ( var i=0; i < this.spaces.length; i++ ) {
    var space = this.spaces[i];
    var canFitInSpaceRow = space.y <= rect.y &&
      space.y + space.height >= rect.y + rect.height &&
      space.width >= rect.width - 0.01; // fudge number for rounding error
    if ( canFitInSpaceRow ) {
      rect.x = space.x;
      this.placed( rect );
      break;
    }
  }
};

proto.placeInSpace = function( rect, space ) {
  // place rect in space
  rect.x = space.x;
  rect.y = space.y;

this.placed( rect );
};

// update spaces with placed rect
proto.placed = function( rect ) {
  // update spaces
  var revisedSpaces = [];
  for ( var i=0; i < this.spaces.length; i++ ) {
    var space = this.spaces[i];
    var newSpaces = space.getMaximalFreeRects( rect );
    // add either the original space or the new spaces to the revised spaces
    if ( newSpaces ) {
      revisedSpaces.push.apply( revisedSpaces, newSpaces );
    } else {
      revisedSpaces.push( space );
    }
  }

this.spaces = revisedSpaces;

this.mergeSortSpaces();
};

proto.mergeSortSpaces = function() {
  // remove redundant spaces
  Packer.mergeRects( this.spaces );
  this.spaces.sort( this.sorter );
};

// add a space back
proto.addSpace = function( rect ) {
  this.spaces.push( rect );
  this.mergeSortSpaces();
};

// -------------------------- utility functions -------------------------- //

/**
 * Remove redundant rectangle from array of rectangles
 * @param {Array} rects: an array of Rects
 * @returns {Array} rects: an array of Rects
**/
Packer.mergeRects = function( rects ) {
  var i = 0;
  var rect = rects[i];

rectLoop:
  while ( rect ) {
    var j = 0;
    var compareRect = rects[ i + j ];

while ( compareRect ) {
      if  ( compareRect == rect ) {
        j++; // next
      } else if ( compareRect.contains( rect ) ) {
        // remove rect
        rects.splice( i, 1 );
        rect = rects[i]; // set next rect
        continue rectLoop; // bail on compareLoop
      } else if ( rect.contains( compareRect ) ) {
        // remove compareRect
        rects.splice( i + j, 1 );
      } else {
        j++;
      }
      compareRect = rects[ i + j ]; // set next compareRect
    }
    i++;
    rect = rects[i];
  }

return rects;
};

// -------------------------- sorters -------------------------- //

// functions for sorting rects in order
var sorters = {
  // top down, then left to right
  downwardLeftToRight: function( a, b ) {
    return a.y - b.y || a.x - b.x;
  },
  // left to right, then top down
  rightwardTopToBottom: function( a, b ) {
    return a.x - b.x || a.y - b.y;
  }
};

// --------------------------  -------------------------- //

return Packer;

}));

/**
 * Packery Item Element
**/

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /* globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'packery/js/item',[
        'outlayer/outlayer',
        './rect'
      ],
      factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      require('outlayer'),
      require('./rect')
    );
  } else {
    // browser global
    window.Packery.Item = factory(
      window.Outlayer,
      window.Packery.Rect
    );
  }

}( window, function factory( Outlayer, Rect ) {

// -------------------------- Item -------------------------- //

var docElemStyle = document.documentElement.style;

var transformProperty = typeof docElemStyle.transform == 'string' ?
  'transform' : 'WebkitTransform';

// sub-class Item
var Item = function PackeryItem() {
  Outlayer.Item.apply( this, arguments );
};

var proto = Item.prototype = Object.create( Outlayer.Item.prototype );

var __create = proto._create;
proto._create = function() {
  // call default _create logic
  __create.call( this );
  this.rect = new Rect();
};

var _moveTo = proto.moveTo;
proto.moveTo = function( x, y ) {
  // don't shift 1px while dragging
  var dx = Math.abs( this.position.x - x );
  var dy = Math.abs( this.position.y - y );

var canHackGoTo = this.layout.dragItemCount && !this.isPlacing &&
    !this.isTransitioning && dx < 1 && dy < 1;
  if ( canHackGoTo ) {
    this.goTo( x, y );
    return;
  }
  _moveTo.apply( this, arguments );
};

// -------------------------- placing -------------------------- //

proto.enablePlacing = function() {
  this.removeTransitionStyles();
  // remove transform property from transition
  if ( this.isTransitioning && transformProperty ) {
    this.element.style[ transformProperty ] = 'none';
  }
  this.isTransitioning = false;
  this.getSize();
  this.layout._setRectSize( this.element, this.rect );
  this.isPlacing = true;
};

proto.disablePlacing = function() {
  this.isPlacing = false;
};

// -----  ----- //

// remove element from DOM
proto.removeElem = function() {
  this.element.parentNode.removeChild( this.element );
  // add space back to packer
  this.layout.packer.addSpace( this.rect );
  this.emitEvent( 'remove', [ this ] );
};

// ----- dropPlaceholder ----- //

proto.showDropPlaceholder = function() {
  var dropPlaceholder = this.dropPlaceholder;
  if ( !dropPlaceholder ) {
    // create dropPlaceholder
    dropPlaceholder = this.dropPlaceholder = document.createElement('div');
    dropPlaceholder.className = 'packery-drop-placeholder';
    dropPlaceholder.style.position = 'absolute';
  }

dropPlaceholder.style.width = this.size.width + 'px';
  dropPlaceholder.style.height = this.size.height + 'px';
  this.positionDropPlaceholder();
  this.layout.element.appendChild( dropPlaceholder );
};

proto.positionDropPlaceholder = function() {
  this.dropPlaceholder.style[ transformProperty ] = 'translate(' +
    this.rect.x + 'px, ' + this.rect.y + 'px)';
};

proto.hideDropPlaceholder = function() {
  this.layout.element.removeChild( this.dropPlaceholder );
};

// -----  ----- //

return Item;

}));

/*!
 * Packery v2.0.0
 * Gapless, draggable grid layouts
 *
 * Licensed GPLv3 for open source use
 * or Packery Commercial License for commercial use
 *
 * http://packery.metafizzy.co
 * Copyright 2016 Metafizzy
 */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /* globals define, module, require */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( 'packery/js/packery',[
        'get-size/get-size',
        'outlayer/outlayer',
        './rect',
        './packer',
        './item'
      ],
      factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      require('get-size'),
      require('outlayer'),
      require('./rect'),
      require('./packer'),
      require('./item')
    );
  } else {
    // browser global
    window.Packery = factory(
      window.getSize,
      window.Outlayer,
      window.Packery.Rect,
      window.Packery.Packer,
      window.Packery.Item
    );
  }

}( window, function factory( getSize, Outlayer, Rect, Packer, Item ) {

// ----- Rect ----- //

// allow for pixel rounding errors IE8-IE11 & Firefox; #227
Rect.prototype.canFit = function( rect ) {
  return this.width >= rect.width - 1 && this.height >= rect.height - 1;
};

// -------------------------- Packery -------------------------- //

// create an Outlayer layout class
var Packery = Outlayer.create('packery');
Packery.Item = Item;

var proto = Packery.prototype;

proto._create = function() {
  // call super
  Outlayer.prototype._create.call( this );

// initial properties
  this.packer = new Packer();
  // packer for drop targets
  this.shiftPacker = new Packer();
  this.isEnabled = true;

this.dragItemCount = 0;

// create drag handlers
  var _this = this;
  this.handleDraggabilly = {
    dragStart: function() {
      _this.itemDragStart( this.element );
    },
    dragMove: function() {
      _this.itemDragMove( this.element, this.position.x, this.position.y );
    },
    dragEnd: function() {
      _this.itemDragEnd( this.element );
    }
  };

this.handleUIDraggable = {
    start: function handleUIDraggableStart( event, ui ) {
      // HTML5 may trigger dragstart, dismiss HTML5 dragging
      if ( !ui ) {
        return;
      }
      _this.itemDragStart( event.currentTarget );
    },
    drag: function handleUIDraggableDrag( event, ui ) {
      if ( !ui ) {
        return;
      }
      _this.itemDragMove( event.currentTarget, ui.position.left, ui.position.top );
    },
    stop: function handleUIDraggableStop( event, ui ) {
      if ( !ui ) {
        return;
      }
      _this.itemDragEnd( event.currentTarget );
    }
  };

};

// ----- init & layout ----- //

/**
 * logic before any new layout
 */
proto._resetLayout = function() {
  this.getSize();

this._getMeasurements();

// reset packer
  var width, height, sortDirection;
  // packer settings, if horizontal or vertical
  if ( this._getOption('horizontal') ) {
    width = Infinity;
    height = this.size.innerHeight + this.gutter;
    sortDirection = 'rightwardTopToBottom';
  } else {
    width = this.size.innerWidth + this.gutter;
    height = Infinity;
    sortDirection = 'downwardLeftToRight';
  }

this.packer.width = this.shiftPacker.width = width;
  this.packer.height = this.shiftPacker.height = height;
  this.packer.sortDirection = this.shiftPacker.sortDirection = sortDirection;

this.packer.reset();

// layout
  this.maxY = 0;
  this.maxX = 0;
};

/**
 * update columnWidth, rowHeight, & gutter
 * @private
 */
proto._getMeasurements = function() {
  this._getMeasurement( 'columnWidth', 'width' );
  this._getMeasurement( 'rowHeight', 'height' );
  this._getMeasurement( 'gutter', 'width' );
};

proto._getItemLayoutPosition = function( item ) {
  this._setRectSize( item.element, item.rect );
  if ( this.isShifting || this.dragItemCount > 0 ) {
    var packMethod = this._getPackMethod();
    this.packer[ packMethod ]( item.rect );
  } else {
    this.packer.pack( item.rect );
  }

this._setMaxXY( item.rect );
  return item.rect;
};

proto.shiftLayout = function() {
  this.isShifting = true;
  this.layout();
  delete this.isShifting;
};

proto._getPackMethod = function() {
  return this._getOption('horizontal') ? 'rowPack' : 'columnPack';
};

/**
 * set max X and Y value, for size of container
 * @param {Packery.Rect} rect
 * @private
 */
proto._setMaxXY = function( rect ) {
  this.maxX = Math.max( rect.x + rect.width, this.maxX );
  this.maxY = Math.max( rect.y + rect.height, this.maxY );
};

/**
 * set the width and height of a rect, applying columnWidth and rowHeight
 * @param {Element} elem
 * @param {Packery.Rect} rect
 */
proto._setRectSize = function( elem, rect ) {
  var size = getSize( elem );
  var w = size.outerWidth;
  var h = size.outerHeight;
  // size for columnWidth and rowHeight, if available
  // only check if size is non-zero, #177
  if ( w || h ) {
    w = this._applyGridGutter( w, this.columnWidth );
    h = this._applyGridGutter( h, this.rowHeight );
  }
  // rect must fit in packer
  rect.width = Math.min( w, this.packer.width );
  rect.height = Math.min( h, this.packer.height );
};

/**
 * fits item to columnWidth/rowHeight and adds gutter
 * @param {Number} measurement - item width or height
 * @param {Number} gridSize - columnWidth or rowHeight
 * @returns measurement
 */
proto._applyGridGutter = function( measurement, gridSize ) {
  // just add gutter if no gridSize
  if ( !gridSize ) {
    return measurement + this.gutter;
  }
  gridSize += this.gutter;
  // fit item to columnWidth/rowHeight
  var remainder = measurement % gridSize;
  var mathMethod = remainder && remainder < 1 ? 'round' : 'ceil';
  measurement = Math[ mathMethod ]( measurement / gridSize ) * gridSize;
  return measurement;
};

proto._getContainerSize = function() {
  if ( this._getOption('horizontal') ) {
    return {
      width: this.maxX - this.gutter
    };
  } else {
    return {
      height: this.maxY - this.gutter
    };
  }
};

// -------------------------- stamp -------------------------- //

/**
 * makes space for element
 * @param {Element} elem
 */
proto._manageStamp = function( elem ) {

this._setRectSize( elem, rect );
  // save its space in the packer
  this.packer.placed( rect );
  this._setMaxXY( rect );
};

// -------------------------- methods -------------------------- //

function verticalSorter( a, b ) {
  return a.position.y - b.position.y || a.position.x - b.position.x;
}

function horizontalSorter( a, b ) {
  return a.position.x - b.position.x || a.position.y - b.position.y;
}

proto.sortItemsByPosition = function() {
  var sorter = this._getOption('horizontal') ? horizontalSorter : verticalSorter;
  this.items.sort( sorter );
};

/**
 * Fit item element in its current position
 * Packery will position elements around it
 * useful for expanding elements
 *
 * @param {Element} elem
 * @param {Number} x - horizontal destination position, optional
 * @param {Number} y - vertical destination position, optional
 */
proto.fit = function( elem, x, y ) {
  var item = this.getItem( elem );
  if ( !item ) {
    return;
  }

// stamp item to get it out of layout
  this.stamp( item.element );
  // set placing flag
  item.enablePlacing();
  this.updateShiftTargets( item );
  // fall back to current position for fitting
  x = x === undefined ? item.rect.x: x;
  y = y === undefined ? item.rect.y: y;
  // position it best at its destination
  this.shift( item, x, y );
  this._bindFitEvents( item );
  item.moveTo( item.rect.x, item.rect.y );
  // layout everything else
  this.shiftLayout();
  // return back to regularly scheduled programming
  this.unstamp( item.element );
  this.sortItemsByPosition();
  item.disablePlacing();
};

/**
 * emit event when item is fit and other items are laid out
 * @param {Packery.Item} item
 * @private
 */
proto._bindFitEvents = function( item ) {
  var _this = this;
  var ticks = 0;
  function onLayout() {
    ticks++;
    if ( ticks != 2 ) {
      return;
    }
    _this.dispatchEvent( 'fitComplete', null, [ item ] );
  }
  // when item is laid out
  item.once( 'layout', onLayout );
  // when all items are laid out
  this.once( 'layoutComplete', onLayout );
};

// -------------------------- resize -------------------------- //

// debounced, layout on resize
proto.resize = function() {
  // don't trigger if size did not change
  // or if resize was unbound. See #285, outlayer#9
  if ( !this.isResizeBound || !this.needsResizeLayout() ) {
    return;
  }

if ( this.options.shiftPercentResize ) {
    this.resizeShiftPercentLayout();
  } else {
    this.layout();
  }
};

/**
 * check if layout is needed post layout
 * @returns Boolean
 */
proto.needsResizeLayout = function() {
  var size = getSize( this.element );
  var innerSize = this._getOption('horizontal') ? 'innerHeight' : 'innerWidth';
  return size[ innerSize ] != this.size[ innerSize ];
};

proto.resizeShiftPercentLayout = function() {
  var items = this._getItemsForLayout( this.items );

var isHorizontal = this._getOption('horizontal');
  var coord = isHorizontal ? 'y' : 'x';
  var measure = isHorizontal ? 'height' : 'width';
  var segmentName = isHorizontal ? 'rowHeight' : 'columnWidth';
  var innerSize = isHorizontal ? 'innerHeight' : 'innerWidth';

// proportional re-align items
  var previousSegment = this[ segmentName ];
  previousSegment = previousSegment && previousSegment + this.gutter;

if ( previousSegment ) {
    this._getMeasurements();
    var currentSegment = this[ segmentName ] + this.gutter;
    items.forEach( function( item ) {
      var seg = Math.round( item.rect[ coord ] / previousSegment );
      item.rect[ coord ] = seg * currentSegment;
    });
  } else {
    var currentSize = getSize( this.element )[ innerSize ] + this.gutter;
    var previousSize = this.packer[ measure ];
    items.forEach( function( item ) {
      item.rect[ coord ] = ( item.rect[ coord ] / previousSize ) * currentSize;
    });
  }

this.shiftLayout();
};

// -------------------------- drag -------------------------- //

/**
 * handle an item drag start event
 * @param {Element} elem
 */
proto.itemDragStart = function( elem ) {
  if ( !this.isEnabled ) {
    return;
  }
  this.stamp( elem );
  // this.ignore( elem );
  var item = this.getItem( elem );
  if ( !item ) {
    return;
  }

item.enablePlacing();
  item.showDropPlaceholder();
  this.dragItemCount++;
  this.updateShiftTargets( item );
};

proto.updateShiftTargets = function( dropItem ) {
  this.shiftPacker.reset();

// pack stamps
  this._getBoundingRect();
  var isOriginLeft = this._getOption('originLeft');
  var isOriginTop = this._getOption('originTop');
  this.stamps.forEach( function( stamp ) {
    // ignore dragged item
    var item = this.getItem( stamp );
    if ( item && item.isPlacing ) {
      return;
    }
    var offset = this._getElementOffset( stamp );
    var rect = new Rect({
      x: isOriginLeft ? offset.left : offset.right,
      y: isOriginTop ? offset.top : offset.bottom
    });
    this._setRectSize( stamp, rect );
    // save its space in the packer
    this.shiftPacker.placed( rect );
  }, this );

// reset shiftTargets
  var isHorizontal = this._getOption('horizontal');
  var segmentName = isHorizontal ? 'rowHeight' : 'columnWidth';
  var measure = isHorizontal ? 'height' : 'width';

this.shiftTargetKeys = [];
  this.shiftTargets = [];
  var boundsSize;
  var segment = this[ segmentName ];
  segment = segment && segment + this.gutter;

if ( segment ) {
    var segmentSpan = Math.ceil( dropItem.rect[ measure ] / segment );
    var segs = Math.floor( ( this.shiftPacker[ measure ] + this.gutter ) / segment );
    boundsSize = ( segs - segmentSpan ) * segment;
    // add targets on top
    for ( var i=0; i < segs; i++ ) {
      this._addShiftTarget( i * segment, 0, boundsSize );
    }
  } else {
    boundsSize = ( this.shiftPacker[ measure ] + this.gutter ) - dropItem.rect[ measure ];
    this._addShiftTarget( 0, 0, boundsSize );
  }

// pack each item to measure where shiftTargets are
  var items = this._getItemsForLayout( this.items );
  var packMethod = this._getPackMethod();
  items.forEach( function( item ) {
    var rect = item.rect;
    this._setRectSize( item.element, rect );
    this.shiftPacker[ packMethod ]( rect );

// add top left corner
    this._addShiftTarget( rect.x, rect.y, boundsSize );
    // add bottom left / top right corner
    var cornerX = isHorizontal ? rect.x + rect.width : rect.x;
    var cornerY = isHorizontal ? rect.y : rect.y + rect.height;
    this._addShiftTarget( cornerX, cornerY, boundsSize );

if ( segment ) {
      // add targets for each column on bottom / row on right
      var segSpan = Math.round( rect[ measure ] / segment );
      for ( var i=1; i < segSpan; i++ ) {
        var segX = isHorizontal ? cornerX : rect.x + segment * i;
        var segY = isHorizontal ? rect.y + segment * i : cornerY;
        this._addShiftTarget( segX, segY, boundsSize );
      }
    }
  }, this );

};

proto._addShiftTarget = function( x, y, boundsSize ) {
  var checkCoord = this._getOption('horizontal') ? y : x;
  if ( checkCoord !== 0 && checkCoord > boundsSize ) {
    return;
  }
  // create string for a key, easier to keep track of what targets
  var key = x + ',' + y;
  var hasKey = this.shiftTargetKeys.indexOf( key ) != -1;
  if ( hasKey ) {
    return;
  }
  this.shiftTargetKeys.push( key );
  this.shiftTargets.push({ x: x, y: y });
};

// -------------------------- drop -------------------------- //

proto.shift = function( item, x, y ) {
  var shiftPosition;
  var minDistance = Infinity;
  var position = { x: x, y: y };
  this.shiftTargets.forEach( function( target ) {
    var distance = getDistance( target, position );
    if ( distance < minDistance ) {
      shiftPosition = target;
      minDistance = distance;
    }
  });
  item.rect.x = shiftPosition.x;
  item.rect.y = shiftPosition.y;
};

function getDistance( a, b ) {
  var dx = b.x - a.x;
  var dy = b.y - a.y;
  return Math.sqrt( dx * dx + dy * dy );
}

// -------------------------- drag move -------------------------- //

var DRAG_THROTTLE_TIME = 120;

/**
 * handle an item drag move event
 * @param {Element} elem
 * @param {Number} x - horizontal change in position
 * @param {Number} y - vertical change in position
 */
proto.itemDragMove = function( elem, x, y ) {
  var item = this.isEnabled && this.getItem( elem );
  if ( !item ) {
    return;
  }

x -= this.size.paddingLeft;
  y -= this.size.paddingTop;

var _this = this;
  function onDrag() {
    _this.shift( item, x, y );
    item.positionDropPlaceholder();
    _this.layout();
  }

// throttle
  var now = new Date();
  if ( this._itemDragTime && now - this._itemDragTime < DRAG_THROTTLE_TIME ) {
    clearTimeout( this.dragTimeout );
    this.dragTimeout = setTimeout( onDrag, DRAG_THROTTLE_TIME );
  } else {
    onDrag();
    this._itemDragTime = now;
  }
};

// -------------------------- drag end -------------------------- //

/**
 * handle an item drag end event
 * @param {Element} elem
 */
proto.itemDragEnd = function( elem ) {
  var item = this.isEnabled && this.getItem( elem );
  if ( !item ) {
    return;
  }

clearTimeout( this.dragTimeout );
  item.element.classList.add('is-positioning-post-drag');

var completeCount = 0;
  var _this = this;
  function onDragEndLayoutComplete() {
    completeCount++;
    if ( completeCount != 2 ) {
      return;
    }
    // reset drag item
    item.element.classList.remove('is-positioning-post-drag');
    item.hideDropPlaceholder();
    _this.dispatchEvent( 'dragItemPositioned', null, [ item ] );
  }

item.once( 'layout', onDragEndLayoutComplete );
  this.once( 'layoutComplete', onDragEndLayoutComplete );
  item.moveTo( item.rect.x, item.rect.y );
  this.layout();
  this.dragItemCount = Math.max( 0, this.dragItemCount - 1 );
  this.sortItemsByPosition();
  item.disablePlacing();
  this.unstamp( item.element );
};

/**
 * binds Draggabilly events
 * @param {Draggabilly} draggie
 */
proto.bindDraggabillyEvents = function( draggie ) {
  this._bindDraggabillyEvents( draggie, 'on' );
};

proto.unbindDraggabillyEvents = function( draggie ) {
  this._bindDraggabillyEvents( draggie, 'off' );
};

proto._bindDraggabillyEvents = function( draggie, method ) {
  var handlers = this.handleDraggabilly;
  draggie[ method ]( 'dragStart', handlers.dragStart );
  draggie[ method ]( 'dragMove', handlers.dragMove );
  draggie[ method ]( 'dragEnd', handlers.dragEnd );
};

/**
 * binds jQuery UI Draggable events
 * @param {jQuery} $elems
 */
proto.bindUIDraggableEvents = function( $elems ) {
  this._bindUIDraggableEvents( $elems, 'on' );
};

proto.unbindUIDraggableEvents = function( $elems ) {
  this._bindUIDraggableEvents( $elems, 'off' );
};

proto._bindUIDraggableEvents = function( $elems, method ) {
  var handlers = this.handleUIDraggable;
  $elems
    [ method ]( 'dragstart', handlers.start )
    [ method ]( 'drag', handlers.drag )
    [ method ]( 'dragstop', handlers.stop );
};

// ----- destroy ----- //

var _destroy = proto.destroy;
proto.destroy = function() {
  _destroy.apply( this, arguments );
  // disable flag; prevent drag events from triggering. #72
  this.isEnabled = false;
};

// -----  ----- //

Packery.Rect = Rect;
Packery.Packer = Packer;

return Packery;

}));

/*!
 * Packery layout mode v2.0.1
 * sub-classes Packery
 */

/*jshint browser: true, strict: true, undef: true, unused: true */

( function( window, factory ) {
  
  // universal module definition
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( [
        'isotope-layout/js/layout-mode',
        'packery/js/packery'
      ],
      factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory(
      require('isotope-layout/js/layout-mode'),
      require('packery')
    );
  } else {
    // browser global
    factory(
      window.Isotope.LayoutMode,
      window.Packery
    );
  }

}( window, function factor( LayoutMode, Packery ) {

// create an Outlayer layout class
  var PackeryMode = LayoutMode.create('packery');
  var proto = PackeryMode.prototype;

var keepModeMethods = {
    _getElementOffset: true,
    _getMeasurement: true
  };

// inherit Packery prototype
  for ( var method in Packery.prototype ) {
    // do not inherit mode methods
    if ( !keepModeMethods[ method ] ) {
      proto[ method ] = Packery.prototype[ method ];
    }
  }

// set packer in _resetLayout
  var _resetLayout = proto._resetLayout;
  proto._resetLayout = function() {
    this.packer = this.packer || new Packery.Packer();
    this.shiftPacker = this.shiftPacker || new Packery.Packer();
    _resetLayout.apply( this, arguments );
  };

var _getItemLayoutPosition = proto._getItemLayoutPosition;
  proto._getItemLayoutPosition = function( item ) {
    // set packery rect
    item.rect = item.rect || new Packery.Rect();
    return _getItemLayoutPosition.call( this, item );
  };

// needsResizeLayout for vertical or horizontal
  var _needsResizeLayout = proto.needsResizeLayout;
  proto.needsResizeLayout = function() {
    if ( this._getOption('horizontal') ) {
      return this.needsVerticalResizeLayout();
    } else {
      return _needsResizeLayout.call( this );
    }
  };

// point to mode options for horizontal
  var _getOption = proto._getOption;
  proto._getOption = function( option ) {
    if ( option == 'horizontal' ) {
      return this.options.isHorizontal !== undefined ?
        this.options.isHorizontal : this.options.horizontal;
    }
    return _getOption.apply( this.isotope, arguments );
  };

return PackeryMode;

}));

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