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              <h1>Sortable Grid Using GreenSock <a href="https://greensock.com/draggable" target="_blank">Draggable</a></h1>

<div class="layout">
  <label><input id="mixed" name="layout" type="radio" value="mixed" checked=""/> Mixed Tile Size</label>
  <label><input id="fixed" name="layout" type="radio" value="fixed"/> Fixed Tile Size</label>
  <label><input id="column" name="layout" type="radio" value="column"/> Single Column</label>
</div>
<button id="add">ADD TILE</button>
<div id="list"></div>
            
          
!
            
              
$background: #3A3A4D;
$tile-color: yellowgreen;
$color: #efefef;

html {
  font-family: RobotoDraft, 'Helvetica Neue', Helvetica, Arial;
}

body {
  background: $background;
  padding: 25px;

}

*, *:before, *:after {
  box-sizing: border-box;
}

h1 {
  color: $color;
  font-weight: normal;
  font-weight: 300;
  margin-bottom: 30px;

  a {
    color: $color;
    border-bottom: 2px solid $color;
    text-decoration: none;
    padding-bottom: 3px;
    
    &:hover {
      color: $tile-color;
      border-color: $tile-color;
    }
  }
}

button {
  padding: 12px 30px;
  box-shadow: none;
  border: none;
  color: $color;
  cursor: pointer;
  background-color: rgba(0, 0, 0, 0.3);

  &:hover {
    background-color: rgba(0, 0, 0, 0.35);
    color: $tile-color;
  }

  &:focus {
    outline: none;
  }
}

#list {
  background-color: rgba(0, 0, 0, 0.2);
  width: 250px;
  width: 90%;
  width: 0;
  position: relative;
  display: block;
  margin-top: 50px;
}

.tile {
  display: block;
  position: absolute;
  background-color: $tile-color;
  color: $background;
  padding: 5px;
  font-weight: bold;
}

.layout {
  color: $color;
  margin-bottom: 15px;
  
  label {
    margin-right: 15px;
    cursor: pointer;
    
    &:hover {
      color: $tile-color;
    }
  }

  input {
    margin-right: 3px;
  }
}

            
          
!
            
              //All code created by Blake Bowen
//Forked from: https://codepen.io/osublake/pen/RNLdpz/

// GRID OPTIONS
var rowSize   = 100;
var colSize   = 100;
var gutter    = 7;     // Spacing between tiles
var numTiles  = 25;    // Number of tiles to initially populate the grid with
var fixedSize = false; // When true, each tile's colspan will be fixed to 1
var oneColumn = false; // When true, grid will only have 1 column and tiles have fixed colspan of 1
var threshold = "50%"; // This is amount of overlap between tiles needed to detect a collision

var $add  = $("#add");
var $list = $("#list");
var $mode = $("input[name='layout']");

// Live node list of tiles
var tiles  = $list[0].getElementsByClassName("tile");
var label  = 1;
var zIndex = 1000;

var startWidth  = "100%";
var startSize   = colSize;
var singleWidth = colSize * 3;

var colCount   = null;
var rowCount   = null;
var gutterStep = null;

var shadow1 = "0 1px 3px  0 rgba(0, 0, 0, 0.5), 0 1px 2px 0 rgba(0, 0, 0, 0.6)";
var shadow2 = "0 6px 10px 0 rgba(0, 0, 0, 0.3), 0 2px 2px 0 rgba(0, 0, 0, 0.2)";

$(window).resize(resize);
$add.click(createTile);
$mode.change(init);

init();

// ========================================================================
//  INIT
// ========================================================================
function init() {

  var width = startWidth;

  // This value is defined when this function 
  // is fired by a radio button change event
  switch (this.value) {

    case "mixed":
      fixedSize = false;
      oneColumn = false;
      colSize   = startSize;
      break;

    case "fixed":
      fixedSize = true;
      oneColumn = false;
      colSize   = startSize;
      break;

    case "column":
      fixedSize = false;
      oneColumn = true;
      width     = singleWidth;
      colSize   = singleWidth;
      break;
  }

  $(".tile").remove();

  TweenLite.to($list, 0.2, { width: width });
  TweenLite.delayedCall(0.25, populateBoard);

  function populateBoard() {

    label = 1;
    resize();

    for (var i = 0; i < numTiles; i++) {
      createTile();
    }
  }
}


// ========================================================================
//  RESIZE
// ========================================================================
function resize() {

  colCount   = oneColumn ? 1 : Math.floor($list.outerWidth() / (colSize + gutter));
  gutterStep = colCount == 1 ? gutter : (gutter * (colCount - 1) / colCount);
  rowCount   = 0;

  layoutInvalidated();
}


// ========================================================================
//  CHANGE POSITION
// ========================================================================
function changePosition(from, to, rowToUpdate) {

  var $tiles = $(".tile");
  var insert = from > to ? "insertBefore" : "insertAfter";

  // Change DOM positions
  $tiles.eq(from)[insert]($tiles.eq(to));

  layoutInvalidated(rowToUpdate);
}

// ========================================================================
//  CREATE TILE
// ========================================================================
function createTile() {

  var colspan = fixedSize || oneColumn ? 1 : Math.floor(Math.random() * 2) + 1;
  var element = $("<div></div>").addClass("tile").html(label++);
  var lastX   = 0;

  Draggable.create(element, {
    onDrag      : onDrag,
    onPress     : onPress,
    onRelease   : onRelease,
    zIndexBoost : false
  });

  // NOTE: Leave rowspan set to 1 because this demo 
  // doesn't calculate different row heights
  var tile = {
    col        : null,
    colspan    : colspan,
    element    : element,
    height     : 0,
    inBounds   : true,
    index      : null,
    isDragging : false,
    lastIndex  : null,
    newTile    : true,
    positioned : false,
    row        : null,
    rowspan    : 1, 
    width      : 0,
    x          : 0,
    y          : 0
  };

  // Add tile properties to our element for quick lookup
  element[0].tile = tile;

  $list.append(element);
  layoutInvalidated();

  function onPress() {

    lastX = this.x;
    tile.isDragging = true;
    tile.lastIndex  = tile.index;

    TweenLite.to(element, 0.2, {
      autoAlpha : 0.75,
      boxShadow : shadow2,
      scale     : 0.95,
      zIndex    : "+=1000"
    });
  }

  function onDrag() {

    // Move to end of list if not in bounds
    if (!this.hitTest($list, 0)) {
      tile.inBounds = false;
      changePosition(tile.index, tiles.length - 1);
      return;
    }

    tile.inBounds = true;

    for (var i = 0; i < tiles.length; i++) {

      // Row to update is used for a partial layout update
      // Shift left/right checks if the tile is being dragged 
      // towards the the tile it is testing
      var testTile    = tiles[i].tile;
      var onSameRow   = (tile.row === testTile.row);
      var rowToUpdate = onSameRow ? tile.row : -1;
      var shiftLeft   = onSameRow ? (this.x < lastX && tile.index > i) : true;
      var shiftRight  = onSameRow ? (this.x > lastX && tile.index < i) : true;
      var validMove   = (testTile.positioned && (shiftLeft || shiftRight));

      if (this.hitTest(tiles[i], threshold) && validMove) {
        changePosition(tile.index, i, rowToUpdate);
        break;
      }
    }

    lastX = this.x;
  }

  function onRelease() {

    // Move tile back to last position if released out of bounds
    this.hitTest($list, 0)
      ? layoutInvalidated()
      : changePosition(tile.index, tile.lastIndex);

    TweenLite.to(element, 0.2, {
      autoAlpha : 1,
      boxShadow: shadow1,
      scale     : 1,
      x         : tile.x,
      y         : tile.y,
      zIndex    : ++zIndex
    });

    tile.isDragging = false;
  }
}

// ========================================================================
//  LAYOUT INVALIDATED
// ========================================================================
function layoutInvalidated(rowToUpdate) {

  var timeline = new TimelineMax();
  var partialLayout = (rowToUpdate > -1);

  var height = 0;
  var col    = 0;
  var row    = 0;
  var time   = 0.35;

  $(".tile").each(function(index, element) {

    var tile    = this.tile;
    var oldRow  = tile.row;
    var oldCol  = tile.col;
    var newTile = tile.newTile;

    // PARTIAL LAYOUT: This condition can only occur while a tile is being 
    // dragged. The purpose of this is to only swap positions within a row, 
    // which will prevent a tile from jumping to another row if a space
    // is available. Without this, a large tile in column 0 may appear 
    // to be stuck if hit by a smaller tile, and if there is space in the 
    // row above for the smaller tile. When the user stops dragging the 
    // tile, a full layout update will happen, allowing tiles to move to
    // available spaces in rows above them.
    if (partialLayout) {
      row = tile.row;
      if (tile.row !== rowToUpdate) return;
    }

    // Update trackers when colCount is exceeded 
    if (col + tile.colspan > colCount) {
      col = 0; row++;
    }

    $.extend(tile, {
      col    : col,
      row    : row,
      index  : index,
      x      : col * gutterStep + (col * colSize),
      y      : row * gutterStep + (row * rowSize),
      width  : tile.colspan * colSize + ((tile.colspan - 1) * gutterStep),
      height : tile.rowspan * rowSize
    });

    col += tile.colspan;

    // If the tile being dragged is in bounds, set a new
    // last index in case it goes out of bounds
    if (tile.isDragging && tile.inBounds) {
      tile.lastIndex = index;
    }

    if (newTile) {

      // Clear the new tile flag
      tile.newTile = false;

      var from = {
        autoAlpha : 0,
        boxShadow : shadow1,
        height    : tile.height,
        scale     : 0,
        width     : tile.width
      };

      var to = {
        autoAlpha : 1,
        scale     : 1,
        zIndex    : zIndex
      }

      timeline.fromTo(element, time, from, to, "reflow");
    }

    // Don't animate the tile that is being dragged and
    // only animate the tiles that have changes
    if (!tile.isDragging && (oldRow !== tile.row || oldCol !== tile.col)) {

      var duration = newTile ? 0 : time;

      // Boost the z-index for tiles that will travel over 
      // another tile due to a row change
      if (oldRow !== tile.row) {
        timeline.set(element, { zIndex: ++zIndex }, "reflow");
      }

      timeline.to(element, duration, {
        x : tile.x,
        y : tile.y,
        onComplete : function() { tile.positioned = true; },
        onStart    : function() { tile.positioned = false; }
      }, "reflow");
    }
  });

  // If the row count has changed, change the height of the container
  if (row !== rowCount) {
    rowCount = row;
    height   = rowCount * gutterStep + (++row * rowSize);
    timeline.to($list, 0.2, { height: height }, "reflow");
  }
}





            
          
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